MIC6211BM5-TR

MIC6211 Operational Amplifier Features General Description • • • • • • • The MIC6211 op amp is a general-purpose, high performance, single- or split-supply, operational amplifier in a space-saving, surface-mount package. 4V to 32V Operation Small Footprint Package Unity Gain Stable 2.5 MHz Unity Gain Bandwidth Rail-to-Rail Output 6 V/μs Typical Slew Rate Short Circuit Protected The MIC6211 operates from 4V to 32V, single or differential (split) supply. The input common-mode range includes ground. The device features a 2.5 MHz unity gain bandwidth, 6 V/μs slew rate, and is internally unity-gain compensated. Applications • • • • • Inputs are protected against reverse polarity (input voltage less than V–) and ESD (electrostatic discharge). Output is current-limited for both sourcing and sinking. Output short-circuits of unlimited duration are allowed, provided the power dissipation specification is not exceeded. Analog Blocks Data Acquisition Sensor Interface Portable Instrumentation Active Filtering The MIC6211 is available in the tiny, 5-lead SOT-23-5 surface-mount package. Package Type Pin Configuration Functional Configuration SOT23–5 (M5) SOT23–5 (M5) IN+ IN+ V– OUT 3 2 IN–  2020 Microchip Technology Inc. V– OUT 2 1 Part Identification A11 4 3 1 5 4 5 V+ IN– V+ DS20006346A-page 1 MIC6211 Functional Diagram V+ 5 20Ω –IN 1 VOUT 4 20Ω CC +IN 3 2 MIC6211 DS20006346A-page 2 V– (GND)  2020 Microchip Technology Inc. MIC6211 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Supply Voltage (VV+ to VV–).......................................................................................................................... 36V or ±18V Differential Input Voltage (VIN+ to VIN–).....................................................................................................................±36V Input Voltage (VIN+, VIN–) .................................................................................................................... (VV- – 0.3V) to VV+ Output Short-Circuit Current Duration................................................................................................................ Indefinite Operating Ratings ‡ Supply Voltage (V+ to V-).............................................................................................................................. +4V to +32V † Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability. ‡ Notice: The device is not guaranteed to function outside the operating ratings.  2020 Microchip Technology Inc. DS20006346A-page 3 MIC6211 ELECTRICAL CHARACTERISTICS (DIFFERENTIAL SUPPLY) Electrical Characteristics: V+ = +15V, V– = –15V VCM = 0V; RL = 2 kΩ; TA = 25°C, TA= TJ; unless otherwise noted. Parameters Symbol Min. Typ. Max. Units Input Offset Voltage VOS — 2 7 mV TCVOS — 7 — μV/°C IB — 50 250 nA — Input Offset Current IOS — 8 30 nA — Input Voltage Range VCM +13.5 +13.8 -15.0 -15.3 — V — Average Input Offset Drift Input Bias Current Conditions — (Note 1) Common-Mode Rejection Ratio CMRR 65 100 — dB VCM = +13.5V, -15.0V Power Supply Rejection Ratio PSRR 65 110 — dB VS = ±2.5V to ±15V Large-Signal Voltage Gain AVOL 25 180 — V/mV Maximum Output Voltage Swing VOUT ±12.5 ±14 — V — Bandwidth BW — 2.5 — MHz — Slew Rate SR — 6 — V/μs — Short-Circuit Output Current ISC 30 50 — mA Sourcing or Sinking Supply Current IS — 1.3 2.0 mA — Note 1: VO = ±10V Not production tested. DS20006346A-page 4  2020 Microchip Technology Inc. MIC6211 ELECTRICAL CHARACTERISTICS (SINGLE SUPPLY) Electrical Characteristics: V+ = +5V, V- = 0V, VCM = 0.1V; TA = 25°C, TA= TJ; unless otherwise noted. Parameters Symbol Min. Typ. Max. Units Input Offset Voltage VOS — 2 7 mV TCVOS — 7 — μV/°C IB — 65 250 nA — 30 nA — — V Average Input Offset Drift Input Bias Current Input Offset Current Input Voltage Range IOS VCM — 8 +3.5 +3.7 0 -0.3 Conditions — (Note 1) Common-Mode Rejection Ratio CMRR 45 70 — dB VCM = 0V to 3.5V Power Supply Rejection Ratio PSRR 65 105 — dB VS = ±2.5V to ±15V Large-Signal Voltage Gain AVOL 15 170 — V/mV Maximum Output Voltage Swing VOUT ±3.8 +4.0 — +1.0 +1.2 V VO = 1.5V to 3.5V, RL = 2 kΩ RL = 10 kΩ to GND RL = 10 kΩ to +5V Short-Circuit Output Current ISC 20 40 — mA Sourcing or Sinking Supply Current IS — 1.2 1.8 mA — Note 1: Not production tested.  2020 Microchip Technology Inc. DS20006346A-page 5 MIC6211 TEMPERATURE SPECIFICATIONS (Note 1) Parameters Symbol Min. Typ. Max. Units TA –40 — +85 °C JA — 200 — °C/W Conditions Temperature Ranges Ambient Temperature Range — Package Thermal Resistance Thermal Resistance SOT-23-5 Note 1: Mounted to PCB The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the maximum allowable power dissipation will cause the device operating junction temperature to exceed the maximum +85°C rating. Sustained junction temperatures above +85°C can impact the device reliability. DS20006346A-page 6  2020 Microchip Technology Inc. MIC6211 The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 1.5 VS = ±15V SUPPLY CURRENT (mA) 1.3 1.2 VS = 5V 1.1 1.0 0.5 1.0 -40 -20 0 20 40 60 80 100 TEMPERATURE (oC) FIGURE 2-1: Temperature. Supply Current vs. 0 VOLTAGE GAIN (dB) VS = 5V VS = ±15V 60 VS = ±15V 80 60 40 20 0 Input Bias Current vs. FIGURE 2-5: Voltage Gain vs. Frequency. 45 30 VS = ±15V 10 VS = 5V 5 VOLTAGE GAIN (dB) 20 15 10,000 FREQUENCY (kHz) 20 PHASE 90 135 10 72 o 0 180 GAIN PHASE (o) FIGURE 2-2: Temperature. 1,000 -20 100 40 0.01 INPUT BIAS CURRENT (nA) Supply Current vs. Supply 100 30 -40 -20 0 20 40 60 80 100 TEMPERATURE (oC) INPUT OFFSET CURRENT (nA) 30 120 80 50 5 10 15 20 25 SUPPLY VOLTAGE (V) FIGURE 2-4: Voltage. 90 70 0 10 SUPPLY CURRENT (mA) 1.4 1 Note: TYPICAL PERFORMANCE CURVES 0.1 2.0 225 -10 VS = ±15V 0 -40 -20 0 20 40 60 80 100 TEMPERATURE (oC) FIGURE 2-3: Temperature. Input Offset Current vs.  2020 Microchip Technology Inc. -20 0.1 FIGURE 2-6: Frequency. 1.0 FREQUENCY (MHz) 270 10 Gain and Phase vs. DS20006346A-page 7 130 30 15 10 110 PSRR (dB) VS = ±15V RL = 2k TA = 25°C 20 100 0 10 80 -PSRR 60 50 0.001 0.01 0.1 1 10 FREQUENCY (kHz) 100 1000 3000 FREQUENCY (kHz) Large-Signal Frequency 110 VS = ±15V 100 90 80 70 60 50 0.01 +PSRR 90 70 5 FIGURE 2-7: Response. CMRR (dB) VS = ±15V 120 25 0.1 1 10 100 1000 FREQUENCY (kHz) FIGURE 2-8: Common Mode Rejection Ratio vs. Frequency. DS20006346A-page 8 100 FIGURE 2-9: Power Supply Rejection Ratio vs. Frequency. SHORT CIRCUIT CURRENT (mA) PEAK-TO-PEAK OUTPUT VOLTAGE (V) MIC6211 65 60 VS = –15V 55 50 45 40 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) FIGURE 2-10: Temperature. Short-Circuit Current vs.  2020 Microchip Technology Inc. –10V +10V OUTPUT VOLTAGE 2μs/DIV GND VS = 15V NOISE VOLTAGE (4μV/DIV) GND 1s/DIV –10V FIGURE 2-11: Response. INPUT VOLTAGE AV = +1 RL = 2k CL = 10pF VS = 15V +10V Large-Signal Transient FIGURE 2-13: 0.1 Hz to 10 Hz Noise. VS = 15V AV = +1 RL = 2k CL = 100pF VS = 15V +50mV GND –50mV +50mV NOISE VOLTAGE (5μV/DIV) INPUT VOLTAGE OUTPUT VOLTAGE MIC6211 GND 5ms/DIV –50mV 500ns/DIV FIGURE 2-12: Response. Small-Signal Transient  2020 Microchip Technology Inc. FIGURE 2-14: Wideband Noise. DS20006346A-page 9 MIC6211 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE Pin Number Symbol Description 1 OUT 2 V– Negative Supply. Negative supply for split supply application or ground for single supply application. Amplifier Output. 3 IN+ Non-Inverting Input. 4 IN– Inverting Input. 5 V+ Positive Supply. DS20006346A-page 10  2020 Microchip Technology Inc. MIC6211 4.0 APPLICATION INFORMATION 4.4 4.1 Common-Mode Range and Output Voltage Figure 4-3 is a voltage controlled current sink. A buffer transistor forces current through a programming resistor until the feedback loop is satisfied. Current flow is VIN/R. This circuit works with single or split supplies. The input common-mode range of the MIC6211 is from the negative supply voltage to 1.2V below the positive supply voltage. The output voltage swings within 1V of the positive and negative supply voltage. 4.2 Voltage Buffer Voltage Controlled Current Sink 3 VIN 1 Figure 4-1 shows a standard voltage follower/buffer. The output voltage equals the input voltage. This circuit is used to buffer a high impedance signal source. This circuit works equally well with single or split supplies. 4 VIN R I 3 VIN 1 VOUT 4.5 4 FIGURE 4-1: Voltage Controlled Current High-Pass Filter Figure 4-4 is an active filter with 20 dB (10×) gain and a low frequency cutoff of 10 Hz. The high gain-bandwidth of the MIC6211 allows operation beyond 100 kHz. This filter configuration is designed for split supplies. VOUT = VIN 4.3 FIGURE 4-3: Sink. R Voltage Buffer. Inverting Amplifier 0.1μF Figure 4-2 shows an inverting amplifier with its gain set by the ratio of two resistors. This circuit works best with split supplies, but will perform with single supply systems if the non-inverting input (+ input) is biased up above ground. 332k 1μF 1μF 4 VIN 1 7.5k VOUT 3 R1 VIN R2 FIGURE 4-4: 4 1 High–Pass Filter. VOUT 3 VOUT = –VIN FIGURE 4-2: ⎛ ⎜ ⎝ R 1⎛ ⎜ R2⎝ Inverting Amplifier.  2020 Microchip Technology Inc. DS20006346A-page 11 MIC6211 VOUT (dB) 30 20 10 0 100,000 10,000 1,000 100 1 -20 10 -10 1 10 1k 100k FREQUENCY (Hz) FIGURE 4-5: 4.6 High-Pass Filter Response. Summing Amplifier Figure 4-5 is a single supply summing amplifier. In this configuration, the output voltage is the sum of V1 and V2, minus the sum of V3 and V4. By adding more resistors to either the inverting or non-inverting input, more voltages may be summed. This single supply version has one important restriction: the sum of V1 and V2 must exceed the sum of V3 and V4, since the output voltage cannot pull below zero with only a single supply. V1 V2 R R 3 1 R VOUT 4 R R V3 R V4 All resistors are equal. VOUT = V1 + V2 – V3 – V4 V1 + V2 > V3 + V4 for single supply operation FIGURE 4-6: DS20006346A-page 12 Summing Amplifier.  2020 Microchip Technology Inc. MIC6211 5.0 PACKAGING INFORMATION 5.1 Package Marking Information 5-Lead SOT-23* (Front) XXX 5-Lead SOT-23* (Back) NNN Legend: XX...X Y YY WW NNN e3 * Example A11 Example 469 Product code or customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week ‘01’) Alphanumeric traceability code Pb-free JEDEC® designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. ●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle mark). Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. Package may or may not include the corporate logo. Underbar (_) and/or Overbar (‾) symbol may not be to scale.  2020 Microchip Technology Inc. DS20006346A-page 13 MIC6211 5-Lead SOT23 Package Outline and Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging. DS20006346A-page 14  2020 Microchip Technology Inc. MIC6211 APPENDIX A: REVISION HISTORY Revision A (July 2020) • Converted Micrel document MIC6211 to Microchip data sheet template DS20006346A. • Minor text changes throughout.  2020 Microchip Technology Inc. DS20006346A-page 15 MIC6211 NOTES: DS20006346A-page 16  2020 Microchip Technology Inc. MIC6211 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office. PART NO. Device XX X Temperature -XX Examples: a) MIC6211YM5-TR: Package Media Type Device: MIC6211: Temperature: Y = –40°C to +85°C Package: M5 = 5-Lead SOT-23 Media Type: TR = 3,000/Reel Op Amp, –40°C to +85°C Junction Temperature Range, 5-Lead SOT-23 Package, 3,000/Reel Operational Amplifier  2020 Microchip Technology Inc. Note 1: Tape and Reel identifier only appears in the catalog part number description. This identifier is used for ordering purposes and is not printed on the device package. Check with your Microchip Sales Office for package availability with the Tape and Reel option. DS20006346A-page 17 MIC6211 NOTES: DS20006346A-page 18  2020 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated. Trademarks The Microchip name and logo, the Microchip logo, Adaptec, AnyRate, AVR, AVR logo, AVR Freaks, BesTime, BitCloud, chipKIT, chipKIT logo, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, HELDO, IGLOO, JukeBlox, KeeLoq, Kleer, LANCheck, LinkMD, maXStylus, maXTouch, MediaLB, megaAVR, Microsemi, Microsemi logo, MOST, MOST logo, MPLAB, OptoLyzer, PackeTime, PIC, picoPower, PICSTART, PIC32 logo, PolarFire, Prochip Designer, QTouch, SAM-BA, SenGenuity, SpyNIC, SST, SST Logo, SuperFlash, Symmetricom, SyncServer, Tachyon, TempTrackr, TimeSource, tinyAVR, UNI/O, Vectron, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. APT, ClockWorks, The Embedded Control Solutions Company, EtherSynch, FlashTec, Hyper Speed Control, HyperLight Load, IntelliMOS, Libero, motorBench, mTouch, Powermite 3, Precision Edge, ProASIC, ProASIC Plus, ProASIC Plus logo, Quiet-Wire, SmartFusion, SyncWorld, Temux, TimeCesium, TimeHub, TimePictra, TimeProvider, Vite, WinPath, and ZL are registered trademarks of Microchip Technology Incorporated in the U.S.A. Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BlueSky, BodyCom, CodeGuard, CryptoAuthentication, CryptoAutomotive, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP, INICnet, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, memBrain, Mindi, MiWi, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PowerSmart, PureSilicon, QMatrix, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. The Adaptec logo, Frequency on Demand, Silicon Storage Technology, and Symmcom are registered trademarks of Microchip Technology Inc. in other countries. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. © 2020, Microchip Technology Incorporated, All Rights Reserved. For information regarding Microchip’s Quality Management Systems, please visit www.microchip.com/quality.  2020 Microchip Technology Inc. ISBN: 978-1-5224-6417-4 DS20006346A-page 19 Worldwide Sales and Service AMERICAS ASIA/PACIFIC ASIA/PACIFIC EUROPE Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: http://www.microchip.com/ support Web Address: www.microchip.com Australia - Sydney Tel: 61-2-9868-6733 India - Bangalore Tel: 91-80-3090-4444 China - Beijing Tel: 86-10-8569-7000 India - New Delhi Tel: 91-11-4160-8631 Austria - Wels Tel: 43-7242-2244-39 Fax: 43-7242-2244-393 China - Chengdu Tel: 86-28-8665-5511 India - Pune Tel: 91-20-4121-0141 Denmark - Copenhagen Tel: 45-4485-5910 Fax: 45-4485-2829 China - Chongqing Tel: 86-23-8980-9588 Japan - Osaka Tel: 81-6-6152-7160 Finland - Espoo Tel: 358-9-4520-820 China - Dongguan Tel: 86-769-8702-9880 Japan - Tokyo Tel: 81-3-6880- 3770 China - Guangzhou Tel: 86-20-8755-8029 Korea - Daegu Tel: 82-53-744-4301 France - Paris Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 China - Hangzhou Tel: 86-571-8792-8115 Korea - Seoul Tel: 82-2-554-7200 China - Hong Kong SAR Tel: 852-2943-5100 Malaysia - Kuala Lumpur Tel: 60-3-7651-7906 China - Nanjing Tel: 86-25-8473-2460 Malaysia - Penang Tel: 60-4-227-8870 China - Qingdao Tel: 86-532-8502-7355 Philippines - Manila Tel: 63-2-634-9065 China - Shanghai Tel: 86-21-3326-8000 Singapore Tel: 65-6334-8870 Germany - Munich Tel: 49-89-627-144-0 Fax: 49-89-627-144-44 China - Shenyang Tel: 86-24-2334-2829 Taiwan - Hsin Chu Tel: 886-3-577-8366 Germany - Rosenheim Tel: 49-8031-354-560 China - Shenzhen Tel: 86-755-8864-2200 Taiwan - Kaohsiung Tel: 886-7-213-7830 Israel - Ra’anana Tel: 972-9-744-7705 China - Suzhou Tel: 86-186-6233-1526 Taiwan - Taipei Tel: 886-2-2508-8600 China - Wuhan Tel: 86-27-5980-5300 Thailand - Bangkok Tel: 66-2-694-1351 Italy - Milan Tel: 39-0331-742611 Fax: 39-0331-466781 China - Xian Tel: 86-29-8833-7252 Vietnam - Ho Chi Minh Tel: 84-28-5448-2100 Atlanta Duluth, GA Tel: 678-957-9614 Fax: 678-957-1455 Austin, TX Tel: 512-257-3370 Boston Westborough, MA Tel: 774-760-0087 Fax: 774-760-0088 Chicago Itasca, IL Tel: 630-285-0071 Fax: 630-285-0075 Dallas Addison, TX Tel: 972-818-7423 Fax: 972-818-2924 Detroit Novi, MI Tel: 248-848-4000 Houston, TX Tel: 281-894-5983 Indianapolis Noblesville, IN Tel: 317-773-8323 Fax: 317-773-5453 Tel: 317-536-2380 Los Angeles Mission Viejo, CA Tel: 949-462-9523 Fax: 949-462-9608 Tel: 951-273-7800 Raleigh, NC Tel: 919-844-7510 New York, NY Tel: 631-435-6000 San Jose, CA Tel: 408-735-9110 Tel: 408-436-4270 Canada - Toronto Tel: 905-695-1980 Fax: 905-695-2078 DS20006346A-page 20 China - Xiamen Tel: 86-592-2388138 China - Zhuhai Tel: 86-756-3210040 Germany - Garching Tel: 49-8931-9700 Germany - Haan Tel: 49-2129-3766400 Germany - Heilbronn Tel: 49-7131-72400 Germany - Karlsruhe Tel: 49-721-625370 Italy - Padova Tel: 39-049-7625286 Netherlands - Drunen Tel: 31-416-690399 Fax: 31-416-690340 Norway - Trondheim Tel: 47-7288-4388 Poland - Warsaw Tel: 48-22-3325737 Romania - Bucharest Tel: 40-21-407-87-50 Spain - Madrid Tel: 34-91-708-08-90 Fax: 34-91-708-08-91 Sweden - Gothenberg Tel: 46-31-704-60-40 Sweden - Stockholm Tel: 46-8-5090-4654 UK - Wokingham Tel: 44-118-921-5800 Fax: 44-118-921-5820  2020 Microchip Technology Inc. 02/28/20