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ULN2803ADWR
+BOMTRANS 8NPN DARL 50V 0.5A 18SO
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ManufacturerTexas Instruments
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Mfr. Part #ULN2803ADWR
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In Stock5066
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Specifications
| Attribute | Value |
| Part Status | Obsolete |
| Base Product Number | ULN2803 |
| Transistor Type | 8 NPN Darlington |
| Current - Collector (Ic) (Max) | 500mA |
| Voltage - Collector Emitter Breakdown (Max) | 50V |
| Vce Saturation (Max) @ Ib, Ic | 1.6V @ 500µA, 350mA |
| Current - Collector Cutoff (Max) | 50µA |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | 18-SOIC (0.295", 7.50mm Width) |
| Supplier Device Package | 18-SOIC |
| Packaging | Tape & Reel (TR) |
Overview
Description
Key specifications:
- Voltage rating: Up to 50V (output) and 30V (input).
- Current handling: 500mA per channel (sink capability).
- Input compatibility: Works with TTL, CMOS, and 5V logic.
- Package: SOIC-18 (surface-mount).
Applications include relay drivers, stepper motor control, and LED displays. The ULN2803ADWR simplifies interfacing low-power logic circuits with high-power devices, offering reliable switching performance.
For more details, refer to the datasheet.
Equivalent
- ULN2803A (same series, different package)
- ULN2804A (higher voltage rating)
- MC1413 (Motorola/NXP equivalent)
- TD62083AP/AFG (Toshiba equivalent)
- KA2667 (Samsung equivalent)
These chips offer similar functionality with 8-channel Darlington drivers, suitable for relay/stepper motor control. Check datasheets for pin compatibility and electrical specs.
Pinout
Key Functions:
- 8-channel Darlington driver (each channel can handle up to 500mA and 50V).
- Common cathode clamp diodes for inductive load protection.
- Inputs compatible with TTL, CMOS, and PMOS (5V logic).
- Outputs are open-collector, requiring external pull-up for high-side switching.
Pinout Summary:
- Pins 1-8: Inputs (IN1-IN8).
- Pins 10-17: Outputs (OUT1-OUT8).
- Pin 9: Common ground for clamp diodes.
- Pin 18: Common emitter (ground for Darlington pairs).
Commonly used for driving relays, motors, LEDs, and other inductive/DC loads.
Manufacturer
Application
1. Relay & Solenoid Drivers – Controls inductive loads.
2. Stepper Motor Drivers – Interfaces microcontrollers with motors.
3. LED Displays – Drives multiple LEDs or 7-segment displays.
4. Logic Buffers – Amplifies digital signals.
5. Industrial & Automotive Systems – Handles high-power switching.
Its 8-channel Darlington configuration makes it ideal for driving various loads from low-power logic circuits.
Frequently Asked Questions
Q: What is the maximum collector current for each Darlington pair in the ULN2803ADWR?
A: The maximum continuous collector current (Ic) is 500mA per channel for the 8 NPN Darlington transistor array.
Q: Can this device drive inductive loads like relays or motors directly?
A: Yes, it integrates suppression diodes for inductive loads, ensuring protection when driving relays, solenoids, or stepper motors.
Q: What is the maximum operating voltage for the collector-emitter circuit?
A: The maximum collector-emitter breakdown voltage (Vce) is 50V, suitable for 12V, 24V, and 48V logic-to-load interfaces.
Q: What is the saturation voltage at typical drive conditions?
A: At 350mA collector current and 500μA base current, the Vce saturation voltage is typically 1.6V maximum.
Q: Is the ULN2803ADWR suitable for surface mount assembly?
A: Yes, it comes in an 18-SOIC (7.50mm width) surface mount package with Tape & Reel packaging for automated SMT processes.
Q: What is the operating temperature range for this component?
A: It operates over the industrial temperature range of -40°C to +125°C (junction temperature), suitable for harsh environments.
Q: Can I use this part for high-current switching with TTL logic inputs?
A: Yes, it features 8 Darlington pairs with a 2.7kΩ input resistor, directly compatible with 5V TTL and 3.3V CMOS logic levels.
