BETAIndependent channels8 Darlington current sinks
Eight-channel Darlington driver
ULN2803A Specifications
Review ULN2803A electrical specifications, operating conditions and package details.
Package view
Key specifications
The load supply provides the output energy. The IC switches each return path; COM catches inductive flyback through the internal diodes.
Output voltage limit50 V · observe transient margin
Single-output limit500 mA · stress rating
Ambient operation−40–85 °C · derating required
Package details
ULN2803APG · PDIP-18
| Property | Details |
|---|---|
| Manufacturer | Toshiba |
| Part number | ULN2803APG |
| Package | PDIP-18 |
| Connections | 18 pins |
| Mounting | Through-hole |
| Lead pitch | 2.54 mm |
| Package code | dip |
| Thermal reference | Board and package dependent; see manufacturer data |
Input and output pairs
18 physical pins · top view
Manufacturer specifications 10 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Channel 1 | I1 pin 1 → O1 pin 18 | HIGH input enables the current sink |
| Channel 2 | I2 pin 2 → O2 pin 17 | HIGH input enables the current sink |
| Channel 3 | I3 pin 3 → O3 pin 16 | HIGH input enables the current sink |
| Channel 4 | I4 pin 4 → O4 pin 15 | HIGH input enables the current sink |
| Channel 5 | I5 pin 5 → O5 pin 14 | HIGH input enables the current sink |
| Channel 6 | I6 pin 6 → O6 pin 13 | HIGH input enables the current sink |
| Channel 7 | I7 pin 7 → O7 pin 12 | HIGH input enables the current sink |
| Channel 8 | I8 pin 8 → O8 pin 11 | HIGH input enables the current sink |
| Ground return | Pin 9 | Controller and load ground |
| Diode common | Pin 10 | Positive inductive-load supply |
No specifications match. Try a parameter name or a unit.
Output numbering runs in the opposite direction across the package.
Electrical characteristics
Toshiba ULN2803A · 25°C
Manufacturer specifications 8 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Input resistor | 2.7 kΩ | Internal series resistor |
| Saturation voltage at 100 mA | 0.9 V typical; 1.1 V maximum | Input current 250 µA |
| Saturation voltage at 200 mA | 1.1 V typical; 1.3 V maximum | Input current 350 µA |
| Saturation voltage at 350 mA | 1.3 V typical; 1.6 V maximum | Input current 500 µA |
| Input current at 3.85 V | 0.93 mA typical; 1.35 mA maximum | ULN2803APG / AFWG |
| Input ON voltage | 2.4 / 2.7 / 3.0 V maximum | Output 200 / 250 / 300 mA; VCE = 2 V |
| Output leakage | 50 µA maximum at 25°C; 100 µA at 85°C | VCE = 50 V |
| Clamp diode drop | 2.0 V maximum | Forward current 350 mA |
No specifications match. Try a parameter name or a unit.
These values refer to the selected Toshiba parts; similar names from other manufacturers can have different limits.
Multi-channel operation
Eight active circuits · manufacturer conditions
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| DIP-18 at 10% duty | 347 mA per channel maximum | 25 ms pulse width; eight circuits |
| DIP-18 at 50% duty | 123 mA per channel maximum | 25 ms pulse width; eight circuits |
| SOP-18 at 10% duty | 268 mA per channel maximum | 25 ms pulse width; eight circuits |
| SOP-18 at 50% duty | 90 mA per channel maximum | 25 ms pulse width; eight circuits |
| DIP power at 85°C | 0.76 W maximum | Recommended operating conditions |
| SOP power at 85°C | 0.48 W maximum | 75 × 114 × 1.6 mm glass-epoxy board; 20% copper |
No specifications match. Try a parameter name or a unit.
Pulse figures are not DC current guarantees. Use the manufacturer duty-cycle and temperature curves for the actual board.
Relay-bank calculations
12 V supply · 240 Ω per coil
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Assumed driver drop | 0.90 V | Fixed teaching estimate |
| Coil voltage | 11.10 V | 12 − 0.90 |
| Current per energized coil | 46.25 mA | 11.10 / 240 |
| Output loss per channel | 41.625 mW | 0.90 × 0.04625 |
| Eight coils energized | 370 mA | Eight identical loads |
| Eight output stages | 333 mW | Does not include input power or switching loss |
| Ground and COM | Pin 9 = GND; pin 10 = +12 V | Never swap these two connections |
No specifications match. Try a parameter name or a unit.
Check relay pickup voltage and supply tolerances. This explorer illustrates steady-state arithmetic, not relay mechanics or temperature.
Absolute maximum ratings
25°C unless otherwise noted
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Output sustaining voltage | −0.5 to 50 V | Stress range |
| Output current | 500 mA per channel | Subject to total dissipation |
| Input voltage | −0.5 to 30 V | Normal example uses 5 V logic |
| Clamp reverse voltage / forward current | 50 V / 500 mA | Absolute maximum ratings |
| DIP total power | 1.47 W | 25°C; derate at higher ambient temperature |
| SOP total power | 0.92 W; 1.31 W on specified board | Board: 75 × 114 × 1.6 mm; 20% copper |
| Operating / storage temperature | −40–85°C / −55–150°C | Ambient operation / unpowered storage |
No specifications match. Try a parameter name or a unit.
Do not combine independent absolute maxima as an operating point. No automatic overcurrent protection is provided.
Packages and timing
ULN2803APG · PDIP-18
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| DIP body | 22.86 × 6.40 mm nominal | 7.62 mm lead rows; 2.54 mm pitch |
| SOP body | 11.35–11.68 × 7.37–7.62 mm | 10.01–10.64 mm outer lead span; 1.27 mm pitch |
| Selected PCB geometry | DIL18 / SO18W | Wide SOP geometry; not the narrow SOP18 pattern |
| Typical turn-on / turn-off | 0.1 / 0.2 µs | RL = 125 Ω; VOUT = 50 V; manufacturer test circuit |
| Pulse test drive | 3 V HIGH; 50 µs; 10% duty | Specified switching test, not the relay example |
| Unused pins | Inputs held LOW; outputs open | COM connected for any inductive loads |
No specifications match. Try a parameter name or a unit.
Footprints are reviewed generic package patterns. Confirm hole, land and assembly tolerances against the purchased part.
Connections by function
Select a pin for its function, connection guidance and electrical notes.