Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Channels | 8 NPN Darlington pairs |
| Collector Voltage | 50 V |
| Current | 500 mA rated single-output class |
| Input Resistors | 2.7 kΩ series base resistor per channel |
| Logic | TTL or 5-V CMOS compatible input network |
| Clamp | Common-cathode clamp diodes for inductive loads |
| Use | Relay, solenoid, lamp and stepper-motor drive |
| Exact Package / Packing | Wide SOIC (DW), 20 pins; 2000-piece large reel; −40°C to +85°C; marking ULN2803C |
Product Overview
ULN2803CDWR extends the familiar Darlington array architecture to eight channels, one more than the ULN2003 family. That extra channel can align better with byte-wide control buses or eight-relay/solenoid banks.
Each input includes a 2.7-kΩ resistor for TTL/5-V CMOS logic, and every output has access to the common clamp-diode node for inductive loads.
The 20-pin wide SOIC provides the extra channel and pin count at the cost of more PCB area than seven-channel TSSOP options. The DWR suffix is the 2000-piece production reel.
For related devices, see HKEQGOO’s Bipolar Transistor Arrays category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | ULN2803CDWR |
| Channels | 8 NPN Darlington pairs |
| Collector Voltage | 50 V |
| Current | 500 mA rated single-output class |
| Input Resistors | 2.7 kΩ series base resistor per channel |
| Logic | TTL or 5-V CMOS compatible input network |
| Clamp | Common-cathode clamp diodes for inductive loads |
| Use | Relay, solenoid, lamp and stepper-motor drive |
| Exact Package / Packing | Wide SOIC (DW), 20 pins; 2000-piece large reel; −40°C to +85°C; marking ULN2803C |
| Manufacturer Status | Active / Production |
| Part Marking | ULN2803C |
Functional Highlights
Eight channels map naturally to byte-wide output expansion
An MCU register or shift register byte can drive an entire eight-load bank without leaving one unused control bit.
Integrated clamps simplify dense inductive banks
Relay or stepper coils can share the common diode return rather than duplicating discrete flyback components.
Design Considerations
- Check total package dissipation when many of eight channels conduct simultaneously.
- Use a logic source capable of the required current through the 2.7-kΩ inputs.
- Account for Darlington saturation loss if efficiency/low-voltage load headroom is critical.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists ULN2803CDWR as Active / Production; SOIC (DW), 20 pins; 2000-piece large tape and reel; −40°C to +85°C; marking ULN2803C.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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