Overview
The ULN2003AIDG4, produced by Texas Instruments, is a high-voltage, high-current Darlington transistor array. This integrated circuit consists of seven NPN Darlington transistor pairs, each capable of sinking up to 500 mA and handling output voltages of up to 50 V. The device is designed to be compatible with 5 V TTL and CMOS logic, making it versatile for a wide range of applications. It features common emitter and open collector outputs, along with suppression diodes for inductive load driving, which helps in managing kick-back voltages from inductive loads such as servomotors and relays.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Collector Current (Single Output) | - | - | - | 500 | mA |
| Output Voltage | - | - | - | 50 | V |
| On-State Input Voltage | VCE = 2 V, IC = 200 mA | - | - | 2.7 | V |
| Collector-Emitter Saturation Voltage | II = 250 μA, IC = 100 mA | 0.9 | 1.2 | 1.4 | V |
| Clamp Forward Voltage | IF = 350 mA | 1.7 | - | 2.2 | V |
| Off-State Input Current | VCE = 50 V, IC = 500 μA | 30 | 65 | - | μA |
| Input Current | VI = 3.85 V | 0.93 | 1.35 | - | mA |
| Propagation Delay Time (Low to High) | - | 1 | - | 10 | μs |
| Propagation Delay Time (High to Low) | - | 1 | - | 10 | μs |
Key Features
- Seven NPN Darlington transistor pairs with high-current gain (β2) up to 10,000 A/A.
- Each transistor pair is rated for 500 mA collector current and 50 V output voltage.
- Includes suppression diodes for inductive load driving to manage kick-back voltages.
- Inputs are compatible with 5 V TTL and CMOS logic.
- Series base resistors (2.7 kΩ) allow direct operation with TTL or 5 V CMOS devices.
- Open collector outputs with common emitter configuration.
- Packaging options include PDIP, SOIC, SOP, and TSSOP.
Applications
- Driver circuits for relays, solenoids, and lamps.
- LED displays and filament lamps.
- Stepper motors and other high-current DC motors.
- Logic buffers and line drivers.
- Thermal print-heads and other high-power buffers.
Q & A
- What is the ULN2003AIDG4 used for?
The ULN2003AIDG4 is used as a high-voltage, high-current driver for various loads such as relays, solenoids, lamps, LED displays, and stepper motors.
- What is the collector current rating of the ULN2003AIDG4?
Each transistor pair in the ULN2003AIDG4 is rated for a collector current of up to 500 mA.
- What is the output voltage rating of the ULN2003AIDG4?
The output voltage rating of the ULN2003AIDG4 is up to 50 V.
- Is the ULN2003AIDG4 compatible with TTL and CMOS logic?
- What type of packaging is available for the ULN2003AIDG4?
The ULN2003AIDG4 is available in PDIP, SOIC, SOP, and TSSOP packaging.
- Why are suppression diodes included in the ULN2003AIDG4?
Suppression diodes are included to manage kick-back voltages from inductive loads such as servomotors and relays.
- What is the propagation delay time of the ULN2003AIDG4?
The propagation delay time for both low-to-high and high-to-low transitions is typically between 1 and 10 μs.
- Can the ULN2003AIDG4 be used for high-power applications?
- How do the Darlington pairs in the ULN2003AIDG4 achieve high current gain?
The Darlington pairs achieve high current gain by connecting two bipolar transistors in direct DC coupling, resulting in a total current gain that is the product of the gains of the two component transistors.
- Can multiple ULN2003AIDG4 devices be stacked for higher current output?
