BETASelected packagePDIP-16ULN2003AN
Seven-channel Darlington driver
ULN2003A Reference Tables
Search the ULN2003A pin reference and manufacturer-referenced specification tables.
Package view
Physical connections16 pinsPackage-specific numbering
Reference collection6 tables36 parameters & pin functions
Pin reference
Signal names, electrical functions and connection guidance
Physical pin numbers16 pins
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| Pin | Signal | Type | Function & connection |
|---|---|---|---|
| 1B | Darlington input | Drives channel 1 through an internal 2.7 kΩ base resistor.Connection guidanceConnect to a 5 V logic output. Tie unused inputs LOW. HIGH turns the corresponding low-side output on. | |
| 2B | Darlington input | Drives channel 2 through an internal 2.7 kΩ base resistor.Connection guidanceConnect to a 5 V logic output. Tie unused inputs LOW. HIGH turns the corresponding low-side output on. | |
| 3B | Darlington input | Drives channel 3 through an internal 2.7 kΩ base resistor.Connection guidanceConnect to a 5 V logic output. Tie unused inputs LOW. HIGH turns the corresponding low-side output on. | |
| 4B | Darlington input | Drives channel 4 through an internal 2.7 kΩ base resistor.Connection guidanceConnect to a 5 V logic output. Tie unused inputs LOW. HIGH turns the corresponding low-side output on. | |
| 5B | Darlington input | Drives channel 5 through an internal 2.7 kΩ base resistor.Connection guidanceConnect to a 5 V logic output. Tie unused inputs LOW. HIGH turns the corresponding low-side output on. | |
| 6B | Darlington input | Drives channel 6 through an internal 2.7 kΩ base resistor.Connection guidanceConnect to a 5 V logic output. Tie unused inputs LOW. HIGH turns the corresponding low-side output on. | |
| 7B | Darlington input | Drives channel 7 through an internal 2.7 kΩ base resistor.Connection guidanceConnect to a 5 V logic output. Tie unused inputs LOW. HIGH turns the corresponding low-side output on. | |
| E | Common emitter | Shared emitter and substrate return for all seven channels.Connection guidanceConnect to load-supply ground and controller ground. This is the high-current return path; route it appropriately. | |
| COM | Clamp diode common | Common cathodes of the seven internal flyback diodes.Connection guidanceConnect to the positive relay or motor-coil supply for inductive loads. COM is not a logic supply pin and is not ground. | |
| 7C | Open-collector driver | Collector output of channel 7.Connection guidanceConnect between the load and the IC; the other load terminal goes to the positive load supply. Sinks current only. Allow Darlington voltage drop and package heating. | |
| 6C | Open-collector driver | Collector output of channel 6.Connection guidanceConnect between the load and the IC; the other load terminal goes to the positive load supply. Sinks current only. Allow Darlington voltage drop and package heating. | |
| 5C | Open-collector driver | Collector output of channel 5.Connection guidanceConnect between the load and the IC; the other load terminal goes to the positive load supply. Sinks current only. Allow Darlington voltage drop and package heating. | |
| 4C | Open-collector driver | Collector output of channel 4.Connection guidanceConnect between the load and the IC; the other load terminal goes to the positive load supply. Sinks current only. Allow Darlington voltage drop and package heating. | |
| 3C | Open-collector driver | Collector output of channel 3.Connection guidanceConnect between the load and the IC; the other load terminal goes to the positive load supply. Sinks current only. Allow Darlington voltage drop and package heating. | |
| 2C | Open-collector driver | Collector output of channel 2.Connection guidanceConnect between the load and the IC; the other load terminal goes to the positive load supply. Sinks current only. Allow Darlington voltage drop and package heating. | |
| 1C | Open-collector driver | Collector output of channel 1.Connection guidanceConnect between the load and the IC; the other load terminal goes to the positive load supply. Sinks current only. Allow Darlington voltage drop and package heating. |
No pins match these filters. Try another signal name or reset the filters.
Connection reference
Input and output pairs
Manufacturer-referenced values9 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-referenced values8 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-referenced values8 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-referenced values6 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-referenced values5 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.
No matching rowsTry a pin name, parameter, unit or test condition, or reset the filters.