CH421TB

Cosemitech (Shanghai) Co., Ltd. CH421S/CH421T/CH421E Industry Product Group This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice and Cosemitech assumes no obligation for future manufacture of this product. Contact Cosemitech for the latest status. REV 1.0 FEATURES and FUNCTIONAL DIAGRAM · · · · · · · · Enhanced sensitivity: will operate from only 45 Gauss typical, at 25°C allowing the use of smaller, potentially lower-cost magnets or wider air gaps Subminiature, SOT-23-3L(CH421S) or SOT-89-3L(CH421E) surface mount package supplied on tape and reel allows for a compact design with automated component placement, helping to reduce manufacturing costs Small, leaded, flat, TO-92S package (CH421T) allows for a compact PCB layout Bipolar latching magnetics respond to alternating North and South poles, making these products well-suited for accurate speed sensing and RPM (revolutions per minute) measurement Wide operating voltage range of 3.3V to 30V makes these sensors useable in a wide range of applications Built-in reverse voltage capability enhances the protection of the sensor and the circuits with which it is used Robust design: will operate up to 150 °C RoHS-compliant material meets directive 2011/65/EU PACKAGE TO-92S SOT-23-3L SOT-89-3L APPLICATIONS Transportation - Speed and RPM (revolutions per minute) sensing - Tachometer, counter pickup - Motor and fan control - Electric window lift - Convertible roof position - Automotive transmission position Industrial - Speed and RPM sensing - Tachometer, counter pickup - Flow-rate sensing - Brushless dc (direct current) motor commutation - Motor and fan control - Robotics control Medical - Motor assemblies - Medication dispense control DESCRIPTION The CH421S ,CH421E and CH421T are small, versatile digital Hall effect devices that are operated by the magnetic field from a permanent magnet or an electromagnet, designed to respond to alternating North and South poles. These bipolar latching sensor ICs have enhanced sensitivity, which often allows for the use of less expensive magnets. These sensor ICs are available in three package styles, the CH421S in the subminiature SOT-23-3L surface mount package, the CH421E in the subminiature SOT-89-3L surface mount package, and the CH421T in the leaded, flat TO-92S package. The CH421S’s and CH421E’s small size requires less PC board space, allowing it to be used in smaller assemblies. Its 3V capability allows for use in low voltage applications, promoting energy efficiency. The CH421S and CH421E are available on tape and reel; the CH421T is available in a bulk package (1000 units per bag). Page 1/10 Cosemitech (Shanghai) Co., Ltd. CH421S/CH421T/CH421E Industry Product Group . This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice and Cosemitech assumes no obligation for future manufacture of this product. Contact Cosemitech for the latest status. REV 1.0 Table of Contents 1. Product Family Members ..........................................................................................................3 2. Pin Definitions and Descriptions ...............................................................................................3 3. Absolute Maximum Ratings ......................................................................................................3 4. ESD Protections ........................................................................................................................4 5. Function Description ................................................................................................................4 6. Definition of Switching Function ...............................................................................................4 7. Temperature Characterization ..................................................................................................4 8. Parameters Specification ..........................................................................................................5 9. Test Conditions ........................................................................................................................6 10.Typical Application Circuit ........................................................................................................6 11.Typical Output Waveform .........................................................................................................6 12. Package Information ...............................................................................................................7 Page 2/10 Cosemitech (Shanghai) Co., Ltd. CH421S/CH421T/CH421E Industry Product Group This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice and Cosemitech assumes no obligation for future manufacture of this product. Contact Cosemitech for the latest status. REV 1.0 1. Product Family Members Part Number Marking ID CH421SR C421 CH421TB C421 CH421ER C421 Description Bipolar latching, Hall-effect digital sensor IC, SOT-23-3L package, tape and reel packing (3000 units per reel) Bipolar latching, Hall-effect digital sensor IC, flat, TO-92S package, bulk packing (1000 units per bag) Bipolar latching, Hall-effect digital sensor IC, SOT-89-3L package, tape and reel packing (1000 units per reel) 2. Pin Definitions and Descriptions SOT-23-3L (S) 1 TO-92S (T) 1 SOT-89-3L (E) 1 2 3 3 2 Name Type VDD Supply Supply Voltage pin 3 OUT Output Open Collector Output pin 2 GND Ground Ground pin SOT-23-3L Function TO-92S SOT-89-3L 3. Absolute Maximum Ratings Parameter Supply Voltage VDD Reverse Voltage VDD Supply Current Symbol VDD VRDD IDD Min - Max 40 -40 20 Units V V mA Output Voltage VOUT -0.3 40 V Output Current IOUT - 25 mA Operating Ambient Temperature TA -40 150 °C Storage Temperature TS -50 150 °C Junction temperature TJ -50 165 °C Magnetic Flux B No Limit Gauss Note: Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolutemaximum- rated conditions for extended periods may affect device reliability. Page 3/10 Cosemitech (Shanghai) Co., Ltd. CH421S/CH421T/CH421E Industry Product Group . This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice and Cosemitech assumes no obligation for future manufacture of this product. Contact Cosemitech for the latest status. REV 1.0 4. ESD Protections Parameter Value Unit All pins 1) +/-3000 V All pins 2) +/-200 V 3) All pins +/-750 1) HBM (human body mode, 100pF, 1.5 kohm ) according to MIL-STD-883H Method 3015.8 2) MM (Machine Mode C=200pF, R=0Ω) according to JEDEC EIA/JESD22-A115 3) CDM (charged device mode) according to JEDEC EIA/JESD22-C101F V 5. Function Description The CH421S/CH421T/CH421E exhibits latch magnetic switching characteristics. Therefore, it requires both south and north poles to operate properly. The device behaves as a latch with symmetric operating and release switching points (BOP=|BRP|). This means magnetic fields with equivalent strength and opposite direction drive the output high and low. Removing the magnetic field (B→0) keeps the output in its previous state. This latching property defines the device as a magnetic memory. A magnetic hysteresis BHYST keeps BOP and BRP separated by a minimal value. This hysteresis prevents output oscillation near the switching point. 6. Magnetic Activation 7. Temperature Characteristics Page 4/10 Cosemitech (Shanghai) Co., Ltd. CH421S/CH421T/CH421E Industry Product Group This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice and Cosemitech assumes no obligation for future manufacture of this product. Contact Cosemitech for the latest status. REV 1.0 8. Parameters Specification (At 3.3V to 30V supply, 20mA load, TA= -40 ºC to 150 ºC except where otherwise specified.) Symbol VDD IDD VDSon IOFF TR TF RTH BOP BRP BHYST FSW T TS Parameter Supply voltage Supply Current Output saturation voltage Output Leakage Current Output rise time Output fall time Thermal resistance: CH421S (SOT-23-3L) CH421T (TO-92S) CH421E (SOT-89-3L) Magnetic operating point Magnetic release point Magnetic hysteresis window Maximum Switching Frequency Operating temperature Storage temperature: Test Condition -40 °C to 150 °C VDD = 5V at 20mA, Gauss >120 BBrp and