BETAIndependent drivers7 NPN Darlington pairs
Seven-channel Darlington driver
ULN2003A Specifications
Review ULN2003A electrical specifications, operating conditions and package details.
Package view
Key specifications
The chip switches the low side of each load. COM serves the clamp diodes; it does not power the input logic.
Collector voltage50 V · rated maximum
Single-output peak rating500 mA · thermal derating required
ULN2003A ambient range−40–70 °C
Package details
ULN2003AN · PDIP-16
| Property | Details |
|---|---|
| Manufacturer | Texas Instruments |
| Part number | ULN2003AN |
| Package | PDIP-16 |
| Connections | 16 pins |
| Mounting | Through-hole |
| Lead pitch | 2.54 mm |
| Package code | dip |
| Thermal reference | Board and package dependent; see manufacturer data |
Connection reference
Input and output pairs
Manufacturer specifications 9 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Channel 1 | 1B pin 1 → 1C pin 16 | HIGH input turns the output sink on |
| Channel 2 | 2B pin 2 → 2C pin 15 | Same behavior |
| Channel 3 | 3B pin 3 → 3C pin 14 | Same behavior |
| Channel 4 | 4B pin 4 → 4C pin 13 | Same behavior |
| Channel 5 | 5B pin 5 → 5C pin 12 | Same behavior |
| Channel 6 | 6B pin 6 → 6C pin 11 | Same behavior |
| Channel 7 | 7B pin 7 → 7C pin 10 | Same behavior |
| Common emitter | E pin 8 | Ground return |
| Diode common | COM pin 9 | Positive inductive-load supply |
No specifications match. Try a parameter name or a unit.
The physical output order is reversed across the package.
Electrical characteristics
ULN2003A · 25°C
Manufacturer specifications 8 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Input resistor | 2.7 kΩ | Internal series base resistor |
| ON input voltage | 2.4 V maximum | IC = 200 mA; VCE = 2 V |
| ON input voltage | 3.0 V maximum | IC = 300 mA; VCE = 2 V |
| Saturation voltage | 0.9 V typical; 1.1 V maximum | 100 mA collector; 250 µA input |
| Saturation voltage | 1.0 V typical; 1.3 V maximum | 200 mA collector; 350 µA input |
| Saturation voltage | 1.2 V typical; 1.6 V maximum | 350 mA collector; 500 µA input |
| Input current | 0.93 mA typical; 1.35 mA maximum | VI = 3.85 V |
| Clamp diode forward voltage | 1.7 V typical; 2.0 V maximum | IF = 350 mA |
No specifications match. Try a parameter name or a unit.
Use the specified drive current when interpreting the saturation-voltage limits.
Operating and stress limits
Do not add seven maximum channel currents
Manufacturer specifications 8 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Collector-emitter voltage | 0–50 V | Recommended range; observe transient margin |
| Recommended junction range | −40 to +125°C | Package thermal design matters |
| Peak collector current | 500 mA per channel | Absolute maximum; see duty-cycle curves |
| Total emitter-terminal current | 2.5 A magnitude | Absolute maximum, not a continuous thermal rating |
| Input voltage | 30 V maximum | Absolute maximum; normal control is 5 V logic |
| Clamp current | 500 mA maximum | Absolute maximum per clamp path |
| Maximum junction temperature | 150°C | Absolute maximum |
| Storage | −65 to +150°C | Unpowered |
No specifications match. Try a parameter name or a unit.
A load’s voltage, current and duty cycle must all fit the complete system.
Relay example calculations
12 V supply · 240 Ω coil
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Illustrative driver drop | 0.90 V | Fixed teaching estimate; actual value varies |
| Coil voltage when ON | 11.10 V | 12 − 0.90 |
| Coil current when ON | 46.25 mA | 11.10 / 240 |
| Driver dissipation per channel | 41.6 mW | 0.90 × 0.04625 |
| Seven channels ON | 323.75 mA; 291.4 mW | Collector current and output-stage dissipation |
| Relay selection | Check guaranteed pickup voltage | Allow supply, coil and driver tolerances |
No specifications match. Try a parameter name or a unit.
These are DC estimates, not a relay pickup guarantee or transient calculation.
Package and thermal reference
ULN2003AN · PDIP-16
Manufacturer specifications 5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Lead pitch | 2.54 mm | Through-hole; top view |
| PDIP-16 RθJA | 66.7°C/W | TI standardized test board |
| SOIC-16 RθJA | 88.6°C/W | TI standardized test board |
| Board dependence | Copper and airflow change temperature | Do not treat RθJA as a universal enclosure constant |
| Unused channels | Inputs LOW; collectors unconnected | Do not leave control inputs floating |
No specifications match. Try a parameter name or a unit.
See the PDF for duty-cycle derating and the exact thermal measurement conditions.
Connections by function
Select a pin for its function, connection guidance and electrical notes.