ULN2003AIPWE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The ULN2003AIPWE4 is a 7-channel high-voltage high-current Darlington transistor array from Texas Instruments in a 16-pin SOIC package. Each channel sinks up to 500 mA with integrated transient suppression diodes for inductive loads. Ideal for driving relays, stepper motors, solenoids, and LED arrays directly from 3.3 V or 5 V logic outputs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- ULN2003AIPWE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 105.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of ULN2003AIPWE4?
- 7-channel open-collector Darlington array with 500 mA per-channel sink current capability, enabling direct driving of relays and solenoids from logic outputs
- Integrated transient suppression diodes on each output protect against inductive kickback from relay coils, stepper motors, and solenoids without external flyback diodes
- Compatible with 3.3 V and 5 V TTL/CMOS logic inputs, allowing direct interface between microcontrollers and high-side inductive or resistive loads up to 50 V
What is ULN2003AIPWE4 used for?
The ULN2003AIPWE4 is commonly used to drive stepper motor coils, relay banks, and solenoid valves from MCU GPIO pins that cannot supply sufficient current directly. Its 7 channels with built-in flyback diodes make it a standard building block in industrial automation controllers, home appliance motor drivers, and LED display matrix drivers. The SOIC-16 package and 5 V logic compatibility enable compact SMD assembly in PLC output modules, HVAC controllers, and robotic actuator boards.
What are the specifications of ULN2003AIPWE4?
| YTEOL | 0 |
| Built-in Protections | TRANSIENT |
| Driver Number of Bits | 7 |
| Input Characteristics | STANDARD |
| Interface IC Type | BUFFER OR INVERTER BASED PERIPHERAL DRIVER |
| JESD-30 Code | R-PDSO-G16 |
| Number of Functions | 1 |
| Output Characteristics | OPEN-COLLECTOR |
| Output Current Flow Direction | SINK |
| Output Peak Current Limit-Nom | 0.5A |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Current-Max | 1.45mA |
| Supply Voltage-Max | 50V |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Turn-off Time | 10 µs |
| Turn-on Time | 10 µs |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the ULN2003AIPWE4 datasheet?
ULN2003AIPWE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for ULN2003AIPWE4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many channels does ULN2003AIPWE4 have and what is the maximum current per channel?
ULN2003AIPWE4 integrates 7 independent Darlington transistor channels, each capable of sinking up to 500 mA peak output current. The 7-channel configuration allows a single IC to drive a full 4-phase unipolar stepper motor (using 4 channels) with 3 channels spare for additional relays or solenoids, reducing the number of driver components needed on a motor control PCB.
Do the built-in transient diodes in ULN2003AIPWE4 eliminate the need for external flyback protection?
Yes. Each output channel of ULN2003AIPWE4 includes an integrated suppression diode connected between the output and the COM pin. When a relay coil or stepper motor winding is de-energised, the collapsing magnetic field generates a voltage spike. The internal diode clamps this spike by connecting COM to the positive supply, typically through a wiring connection to VCC, protecting the output transistors and any upstream logic without requiring external flyback diodes.
Is ULN2003AIPWE4 directly compatible with 3.3 V GPIO outputs from modern MCUs?
Yes. ULN2003AIPWE4 accepts standard TTL and CMOS input levels including 3.3 V logic. The input base resistors inside each Darlington pair are sized to ensure full saturation with a 3.3 V high-level input, so modern 3.3 V microcontrollers can drive relays or 50 V loads through the ULN2003AIPWE4 without any level-shifting circuitry, simplifying the interface design significantly.
For driving a 4-phase stepper motor with ULN2003AIPWE4, what voltage can the motor coils run at?
ULN2003AIPWE4 output transistors are rated to withstand load voltages up to 50 V, allowing the stepper motor coils to be powered from 5 V, 12 V, or 24 V supplies depending on the motor specification. The 500 mA per-channel current limit covers most small unipolar stepper motors, which typically draw 100 mA to 400 mA per phase, making the ULN2003AIPWE4 a practical single-chip drive solution for these motors.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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