Overview
The ULN2004AD is a high-voltage, high-current Darlington transistor array produced by Texas Instruments. This device consists of seven NPN Darlington pairs, each capable of handling high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The ULN2004AD is designed to operate with CMOS devices using supply voltages of 6V to 15V, making it a versatile component for various driver applications.
Key Specifications
| Parameter | Value |
|---|---|
| Transistor Type | NPN |
| Maximum Continuous Collector Current | 500 mA |
| Maximum Collector Emitter Voltage | 50 V |
| Package Type | SOIC |
| Mounting Type | Surface Mount |
| Pin Count | 16 |
| Transistor Configuration | Common Emitter |
| Number of Elements per Chip | 7 |
| Maximum Collector Emitter Saturation Voltage | 1.6 V |
| Dimensions | 9.9 x 3.91 x 1.58 mm |
| Minimum Operating Temperature | -20 °C |
| Maximum Operating Temperature | +70 °C |
Key Features
- High-voltage outputs: 50V
- 500mA-rated collector current (single output)
- Output clamp diodes for switching inductive loads
- Inputs compatible with various types of logic, including TTL and 5V CMOS devices
- 10.5kΩ series base resistor for each Darlington pair to allow operation directly from CMOS devices with supply voltages of 6V to 15V
- Low input current requirement
Applications
- Relay drivers
- Hammer drivers
- Lamp drivers
- Display drivers (LED and gas discharge)
- Line drivers
- Logic buffers
Q & A
- What is the maximum collector current of the ULN2004AD?
The maximum continuous collector current is 500 mA. - What is the maximum collector-emitter voltage of the ULN2004AD?
The maximum collector-emitter voltage is 50 V. - What type of package does the ULN2004AD come in?
The ULN2004AD comes in a 16-pin SOIC package. - What is the operating temperature range of the ULN2004AD?
The operating temperature range is -20 °C to +70 °C. - Can the ULN2004AD be used with CMOS devices?
Yes, it is designed to operate directly with CMOS devices using supply voltages of 6V to 15V. - What is the purpose of the output clamp diodes in the ULN2004AD?
The output clamp diodes are used to suppress the kick-back voltage from inductive loads. - How many Darlington pairs are in the ULN2004AD?
There are seven NPN Darlington pairs. - Can the Darlington pairs be paralleled for higher current capability?
Yes, the Darlington pairs can be paralleled for higher current capability. - What is the maximum collector-emitter saturation voltage of the ULN2004AD?
The maximum collector-emitter saturation voltage is 1.6 V. - What are some common applications of the ULN2004AD?
Common applications include relay drivers, hammer drivers, lamp drivers, display drivers, line drivers, and logic buffers.
