ULN2804 Darlington Transistor Array SMD IC SOP-18-300mil
The eight ULN2804 NPN Darlington-connected transistors in this family of arrays are ideally suited for interfacing between low logic level digital circuitry (such as TTL, CMOS, or PMOS/NMOS) and the higher current/voltage requirements of lamps, relays, printer hammers, or other similar loads for a broad range of computer, industrial, and consumer applications. All devices feature open–collector outputs and free-wheeling clamp diodes for transient suppression.
Features
- Eight NPN Darlington channels with common emitters for multi‑output sink driving.
- Integral clamp diodes on each output for inductive load protection.
- 10.5 kΩ input resistors compatible with 6 V–15 V PMOS/CMOS logic.
- Each channel sinks up to 500 mA continuous at output voltages to 50 V.
- SOP‑18‑300 mil surface‑mount package for space‑efficient PCB designs.
- Operating temperature range from −40 °C to +85 °C.
- Power dissipation of 0.92 W on standard glass‑epoxy PCB (75 × 114 × 1.6 mm, Cu 20 %).
Specifications
Absolute Maximum Ratings (Ta = 25°C)
| Characteristic | Symbol | Rating | Unit |
|---|---|---|---|
| Output sustaining voltage | VCE (SUS) | −0.5 ~ 50 | V |
| Output current | IOUT | 500 | mA / ch |
| Input voltage | VIN | −0.5 ~ 30 | V |
| Clamp diode reverse voltage | VR | 50 | V |
| Clamp diode forward current | IF | 500 | mA |
| Power dissipation (APG) | PD | 1.47 | W |
| Power dissipation (AFWG) | PD | 0.92 / 1.31 (Note) | W |
| Operating temperature | Topr | −40 ~ 85 | °C |
| Storage temperature | Tstg | −55 ~ 150 | °C |
PINOUT
| PIN NO | PIN NAME | DESCRIPTION |
|---|---|---|
| 1 | 1B | Input Pin1B |
| 2 | 2B | Input Pin 2B |
| 3 | 3B | Input Pin 3B |
| 4 | 4B | Input Pin 4B |
| 5 | 5B | Input Pin 5B |
| 6 | 6B | Input Pin 6B |
| 7 | 7B | Input Pin 7B |
| 8 | 8B | Input Pin 8B |
| 9 | GND | Ground Pin |
| 10 | COM | Common Pin |
| 11 | 8C | Output Pin 8C |
| 12 | 7C | Output Pin 7C |
| 13 | 6C | Output Pin 6C |
| 14 | 5C | Output Pin 5C |
| 15 | 4C | Output Pin 4C |
| 16 | 3C | Output Pin 3C |
| 17 | 2C | Output Pin 2C |
| 18 | 1C | Output Pin 1C |
Dimensions
Applications
- Driving relays, solenoids, and DC motors in industrial control systems.
- Interfacing microcontrollers or logic circuits to inductive loads.
- LED matrix and lamp display multiplexing.
- Multi‑channel sinking in PLC and automation equipment.
- Compact PCB designs requiring eight‑channel buffer drivers.
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