Overview
The SN75469DR, produced by Texas Instruments, is a high-voltage, high-current Darlington transistor array. This device consists of seven NPN Darlington pairs, each capable of handling up to 500 mA of collector current. It is designed to operate with various types of logic, including TTL, 5-V CMOS, and CMOS or PMOS with supply voltages ranging from 6 to 15 V. The SN75469DR features high-voltage outputs with common-cathode clamp diodes, making it suitable for driving inductive loads such as relays, solenoids, and motors.
Key Specifications
| Parameter | Test Conditions | Unit | Min | Typ | Max |
|---|---|---|---|---|---|
| Collector Current (IC) | Single Output | mA | 500 | ||
| Output Voltage (VCE) | V | 100 | |||
| On-state Input Voltage (VI(on)) | VCE = 2 V, IC = 250 mA | V | 2.7 | ||
| Collector-Emitter Saturation Voltage (VCE(sat)) | II = 250 µA, IC = 100 mA | V | 0.9 | 1.1 | |
| Clamp Diode Forward Voltage (VF) | IF = 350 mA | V | 1.7 | 2 | |
| Collector Cutoff Current (ICEX) | VCE = 100 V, TA = 70°C | µA | 100 | ||
| Operating Temperature Range | °C | -40 | 105 |
Key Features
- High-voltage outputs up to 100 V
- 500-mA rated collector current per Darlington pair
- Inputs compatible with TTL, 5-V CMOS, and CMOS or PMOS with supply voltages of 6 to 15 V
- Common-cathode clamp diodes for inductive load switching
- Series base resistors (10.5 kΩ for SN75469) for direct logic compatibility
- Ability to parallel Darlington pairs for higher current capability
- Suppression diodes to handle kick-back voltage from inductive loads
Applications
- Relay drivers
- Hammer drivers
- Lamp drivers (LED and gas discharge)
- Display drivers
- Line drivers
- Logic buffers
- Driving solenoids, motors, and other inductive loads
Q & A
- What is the maximum collector current per Darlington pair in the SN75469DR? The maximum collector current per Darlington pair is 500 mA.
- What is the maximum output voltage of the SN75469DR? The maximum output voltage is 100 V.
- Can the SN75469DR be used with TTL logic? Yes, the SN75469DR can be used with TTL logic, but it is optimized for CMOS or PMOS with supply voltages of 6 to 15 V.
- What is the purpose of the clamp diodes in the SN75469DR? The clamp diodes are used to suppress the kick-back voltage from inductive loads.
- Can the Darlington pairs be paralleled for higher current capability? Yes, the Darlington pairs can be paralleled to increase the current handling capability.
- What is the operating temperature range of the SN75469DR? The operating temperature range is from -40°C to 105°C.
- What types of loads can the SN75469DR drive? The SN75469DR can drive inductive loads such as relays, solenoids, and motors, as well as resistive loads like lamps and LEDs.
- How do the series base resistors affect the operation of the SN75469DR? The series base resistors (10.5 kΩ for SN75469) allow the device to operate directly with CMOS or PMOS logic without additional external components.
- What is the significance of the high current gain (β) in the SN75469DR? The high current gain (β) allows for high output current drive with a very low input current, making it efficient for use with low GPIO voltages.
- Can the SN75469DR be used in safety-critical applications? It is recommended to carefully evaluate and test the device in any safety-critical application to ensure it meets all necessary requirements.
