1N937B

1N935B-1 – 1N938B-1 Qualified Levels: JAN, JANTX, JANTXV and JANS Temperature Compensated Zener Reference Diodes Available on commercial versions Qualified per MIL-PRF-19500/156 DESCRIPTION The popular 1N935B-1 through 1N938B-1 series of Zero-TC (Temperature Compensated) reference diodes provides a selection of 9.0 V nominal voltages and temperature coefficients to as low as 0.001 %/oC for minimal voltage change with temperature when operated at 7.5 mA. These glass axial-leaded DO-35 reference diodes are also available in JAN, JANTX, JANTXV and JANS military qualifications. For commercial applications it is also available as RoHS compliant. Important: For the latest information, visit our website http://www.microsemi.com. DO-35 (DO-204AH) Package FEATURES • • • • • • • JEDEC registered 1N935 through 1N938 number series. Standard reference voltage of 9.0V +/- 5%. Temperature compensated. Internal metallurgical bond. Double plug construction. JAN, JANTX, JANTXV and JANS qualification are available per MIL-PRF-19500/156. RoHS compliant versions available (commercial grade only). Also available in: DO-213AA MELF (surface mount) 1N935BUR-1 – 1N938BUR-1 APPLICATIONS / BENEFITS • • • • • Provides minimal voltage changes over a broad temperature range. For instrumentation and other circuit designs requiring a stable voltage reference. Maximum temperature coefficient selections available from 0.01 %/ºC to 0.001 %/ºC. Flexible axial-lead mounting terminals. Non-sensitive to ESD per MIL-STD-750 method 1020. MAXIMUM RATINGS @ T A = 25 ºC unless otherwise stated Parameters/Test Conditions Junction and Storage temperature (1) Power Dissipation Maximum Zener Current Solder Pad Temperatures at 10 s Symbol T J and T STG PD I ZM T SP Value -65 to +175 500 50 260 Unit o C mW mA o C Notes: 1. @ T L = 50 oC maximum (see figure 1). For optimum voltage-temperature stability, I Z = 7.5 mA (less than 50 mW in dissipated power). Derate at 3.33 mW/oC above T A = +25 oC. MSC – Lawrence 6 Lake Street, Lawrence, MA 01841 1-800-446-1158 Tel: (978) 620-2600 Fax: (978) 689-0803 MSC – Ireland Gort Road Business Park, Ennis, Co. Clare, Ireland Tel: +353 (0) 65 6840044 Fax: +353 (0) 65 6822298 Website: www.microsemi.com T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 1 of 6 1N935B-1 – 1N938B-1 MECHANICAL and PACKAGING • • • • • • • CASE: Hermetically sealed glass case. DO-35 (DO-204AH) package. TERMINALS: Tin-lead or RoHS compliant annealed matte-tin plating (commercial grade only) over copper clad steel. Solderable per MIL-STD-750, method 2026. MARKING: Part number and cathode band. POLARITY: Reference diode to be operated with the banded (cathode) end positive with respect to the opposite end. TAPE & REEL option: Standard per EIA-296 (add “TR” suffix to part number). Consult factory for quantities. WEIGHT: Approximately 0.2 grams. See package dimensions on last page. PART NOMENCLATURE JAN 1N935 B -1 e3 Reliability Level* JAN = JAN Level JANTX = JANTX Level JANTXV = JANTXV Level JANS = JANS Level * (available on “B” suffix only) Blank = Commercial RoHS Compliance e3 = RoHS compliant (available on commercial grade only) Blank = non-RoHS compliant Metallurgical Bond Temperature Range Blank = 0 to +75 ºC A = -55 to +100 ºC B = -55 to +150 ºC (required for JAN level) JEDEC type number (see Electrical Characteristics table) SYMBOLS & DEFINITIONS Definition Symbol I ZM I Z , I ZT , I ZK VZ Z ZT or Z ZK Maximum Zener Current: The maximum rated dc current for the specified power rating. Regulator Current: The dc regulator current (I Z ), at a specified test point (I ZT ), near breakdown knee (I ZK ). Zener Voltage: The Zener voltage the device will exhibit at a specified current (I Z ) in its breakdown region. Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a specified rms current modulation (typically 10% of I ZT or I ZK ) and superimposed on I ZT or I ZK respectively. T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 2 of 6 1N935B-1 – 1N938B-1 o ELECTRICAL CHARACTERISTICS @ 25 C unless otherwise specified ZENER VOLTAGE MAXIMUM ZENER IMPEDACE (Note 1) Z ZT VOLTAGE TEMPERATURE STABILITY ∆V ZT MAXIMUM (Note 2) TEMPERATURE RANGE V Z @ I ZT ZENER TEST CURRENT I ZT EFFECTIVE TEMPERATURE COEFFICIENT α VZ Volts mA Ohms mV °C % / °C 1N935-1 1N935A-1 1N935B-1 8.55 – 9.45 8.55 – 9.45 8.55 – 9.45 7.5 7.5 7.5 20 20 20 67 139 184 0 to +75 -55 to +100 -55 to +150 0.01 0.01 0.01 1N936-1 1N936A-1 1N936B-1 8.55 – 9.45 8.55 – 9.45 8.55 – 9.45 7.5 7.5 7.5 20 20 20 34 70 92 0 to +75 -55 to +100 -55 to +150 0.055 0.005 0.005 1N937B-1 1N937-1 1N937A-1 1N937B-1 8.55 – 9.45 8.55 – 9.45 8.55 – 9.45 7.5 7.5 7.5 20 20 20 13 28 37 0 to +75 -55 to +100 -55 to +150 0.002 0.002 0.002 1N938B-1 1N938-1 1N938A-1 1N938B-1 8.55 – 9.45 8.55 – 9.45 8.55 – 9.45 7.5 7.5 7.5 20 20 20 6.7 13.9 19 0 to +75 -55 to +100 -55 to +150 0.001 0.001 0.001 MIL-PRF19500/156 1N935B-1 JEDEC TYPE NUMBER NOTE 1: Zener impedance is derived by superimposing on I ZT A 60 Hz rms ac current equal to 10% of I ZT . NOTE 2: The maximum allowable change observed over the entire temperature range i.e., the diode voltage will not exceed the specified mV at any discrete temperature between the established limits, per JEDEC standard No. 5. T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 3 of 6 1N935B-1 – 1N938B-1 Pd, Rated Power Dissipation (mW) GRAPHS T L , Lead Temperature (C°) 3/8” from body Zener Impedance ZZT (Ohms) FIGURE 1 Power Derating Curve Operating Current I Z (mA) FIGURE 2 Zener Impedance vs. Operating Current T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 4 of 6 1N935B-1 – 1N938B-1 Change in Temperature Coefficient (%/°C) GRAPHS Operating Current I Z (mA) FIGURE 3 Typical Change of Temperature Coefficient with Change in Operating Current T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 5 of 6 1N935B-1 – 1N938B-1 PACKAGE DIMENSIONS Dimensions Millimeters Max Min Max 0.075 1.52 1.91 0.180 3.56 4.57 0.022 0.46 0.56 1.500 25.40 38.10 0.050 1.27 Inch Ltr BD BL LD LL LL 1 Min 0.060 0.140 0.018 1.000 Notes 3 3 4 NOTES: 1. Dimensions are in inches. 2. Millimeters are given for general information only. 3. Package contour optional within BD and length BL. Heat slugs, if any shall be included within this cylinder but shall not be subject to minimum limit of BD. 4. Within this zone, lead diameter may vary to allow for lead finishes and irregularities, other than heat slugs. 5. In accordance with ASME Y14.5M, diameters are equivalent to Φx symbology. 6. The dimensions shown are tighter in tolerance than dimensions shown in the military slash sheet (/156) since Microsemi now only offers the smaller DO-35 package option rather than the larger DO-7. T4-LDS-0155, Rev. 2 (121998) ©2013 Microsemi Corporation Page 6 of 6