BETASelected packagePDIP-18ULN2803APG
Eight-channel Darlington driver
ULN2803A Reference Tables
Search the ULN2803A pin reference and manufacturer-referenced specification tables.
Package view
Physical connections18 pinsPackage-specific numbering
Reference collection7 tables44 parameters & pin functions
Pin reference
Signal names, electrical functions and connection guidance
Physical pin numbers18 pins
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| Pin | Signal | Type | Function & connection |
|---|---|---|---|
| I1 | Logic input | Input of Darlington channel 1, through an internal 2.7 kΩ resistor.Connection guidanceConnect to a 5 V TTL/CMOS output; hold unused inputs LOW. HIGH enables the matching output sink. Check the required input drive at the intended collector current. | |
| I2 | Logic input | Input of Darlington channel 2, through an internal 2.7 kΩ resistor.Connection guidanceConnect to a 5 V TTL/CMOS output; hold unused inputs LOW. HIGH enables the matching output sink. Check the required input drive at the intended collector current. | |
| I3 | Logic input | Input of Darlington channel 3, through an internal 2.7 kΩ resistor.Connection guidanceConnect to a 5 V TTL/CMOS output; hold unused inputs LOW. HIGH enables the matching output sink. Check the required input drive at the intended collector current. | |
| I4 | Logic input | Input of Darlington channel 4, through an internal 2.7 kΩ resistor.Connection guidanceConnect to a 5 V TTL/CMOS output; hold unused inputs LOW. HIGH enables the matching output sink. Check the required input drive at the intended collector current. | |
| I5 | Logic input | Input of Darlington channel 5, through an internal 2.7 kΩ resistor.Connection guidanceConnect to a 5 V TTL/CMOS output; hold unused inputs LOW. HIGH enables the matching output sink. Check the required input drive at the intended collector current. | |
| I6 | Logic input | Input of Darlington channel 6, through an internal 2.7 kΩ resistor.Connection guidanceConnect to a 5 V TTL/CMOS output; hold unused inputs LOW. HIGH enables the matching output sink. Check the required input drive at the intended collector current. | |
| I7 | Logic input | Input of Darlington channel 7, through an internal 2.7 kΩ resistor.Connection guidanceConnect to a 5 V TTL/CMOS output; hold unused inputs LOW. HIGH enables the matching output sink. Check the required input drive at the intended collector current. | |
| I8 | Logic input | Input of Darlington channel 8, through an internal 2.7 kΩ resistor.Connection guidanceConnect to a 5 V TTL/CMOS output; hold unused inputs LOW. HIGH enables the matching output sink. Check the required input drive at the intended collector current. | |
| GND | Common emitter return | Shared emitter return for all eight Darlington pairs.Connection guidanceJoin the controller and load-supply grounds. This lead carries the combined output current. Route its return with appropriate copper and low impedance. | |
| COM | Clamp-diode common | Common cathodes of the eight internal inductive-load diodes.Connection guidanceConnect to the positive coil supply for inductive loads. COM is not a logic supply or ground. The driver inputs do not require a separate VCC pin. | |
| O8 | Open-collector output | Collector of Darlington channel 8.Connection guidanceConnect to the low side of the load; its other side goes to the positive load rail. Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating. | |
| O7 | Open-collector output | Collector of Darlington channel 7.Connection guidanceConnect to the low side of the load; its other side goes to the positive load rail. Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating. | |
| O6 | Open-collector output | Collector of Darlington channel 6.Connection guidanceConnect to the low side of the load; its other side goes to the positive load rail. Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating. | |
| O5 | Open-collector output | Collector of Darlington channel 5.Connection guidanceConnect to the low side of the load; its other side goes to the positive load rail. Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating. | |
| O4 | Open-collector output | Collector of Darlington channel 4.Connection guidanceConnect to the low side of the load; its other side goes to the positive load rail. Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating. | |
| O3 | Open-collector output | Collector of Darlington channel 3.Connection guidanceConnect to the low side of the load; its other side goes to the positive load rail. Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating. | |
| O2 | Open-collector output | Collector of Darlington channel 2.Connection guidanceConnect to the low side of the load; its other side goes to the positive load rail. Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating. | |
| O1 | Open-collector output | Collector of Darlington channel 1.Connection guidanceConnect to the low side of the load; its other side goes to the positive load rail. Sinks current only. A HIGH input turns this output on; allow for its saturation voltage and package heating. |
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Input and output pairs
18 physical pins · top view
Manufacturer-referenced values10 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-referenced values8 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 |
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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-referenced values6 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-referenced values7 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-referenced values7 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-referenced values6 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 |
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Footprints are reviewed generic package patterns. Confirm hole, land and assembly tolerances against the purchased part.
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