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Texas Instruments ULN2003AIDRE4
- Part No.:
- ULN2003AIDRE4
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ULN2003AIDRE4.pdf
- Description:
- IC PWR RELAY 7NPN 1:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
ULN2003AIDRE4 from Texas Instruments is a 7-channel high-voltage, high-current NPN Darlington transistor array designed for logic-level interfacing to inductive and resistive loads. It delivers 500mA per channel, supports 50V collector-emitter voltage, integrates input base resistors (2.7kΩ), built-in clamp diodes, and operates across –40°C to 105°C - widely used in relay and stepper motor control circuits.
For engineers reviewing the ULN2003AIDRE4 datasheet, ULN2003AIDRE4 pinout, ULN2003AIDRE4 application, or ULN2003AIDRE4 equivalent, key selection criteria include per-channel sink current capability, integrated flyback diode configuration, thermal derating at elevated ambient temperatures, and compatibility with 3.3V/5V TTL and CMOS logic inputs without external biasing.
Technical Context
The ULN2003AIDRE4 implements seven independent Darlington pairs, each with a 2.7kΩ series input resistor enabling direct drive from 3.3V or 5V logic. Its open-collector outputs share a common emitter (pin 8) and a common cathode clamp node (pin 9), allowing simultaneous suppression of inductive kickback across all channels when COM is tied to the load supply rail.
Each Darlington stage provides current gain up to 10,000 A/A, permitting low-input-current switching (e.g., ~0.35mA at 5V input) while sustaining 300mA output current with VCE(sat) ≤ 1.3V. Switching times are under 1μs at 25°C, and absolute maximum ratings include 50V collector-emitter voltage and ±2000V HBM ESD tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channel count | 7 independent Darlington sink drivers - enables compact multi-load control without discrete transistors |
| Max collector current per channel | 500mA - sufficient for driving relays, solenoids, and small DC motors directly |
| Collector-emitter voltage rating | 50V - supports industrial 24V and telecom 48V systems with margin |
| Input resistor value | 2.7kΩ - allows direct interface to 3.3V/5V logic without external bias components |
| VCE(sat) @ 350mA | ≤1.6V - limits power dissipation to <1W per active channel at full load |
| Operating temperature range | –40°C to +105°C - qualified for extended-temperature industrial and automotive under-hood applications |
| ESD rating (HBM) | ±2000V - meets standard handling requirements without additional protection circuitry |
Pinout & Package
ULN2003AIDRE4 is housed in a 16-pin SOIC (D) package measuring 9.90mm × 3.91mm, with gull-wing leads and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1B–7B (pins 1–7) | Input base terminals | Logic-level inputs with internal 2.7kΩ pull-up to VIN; accept 3.3V/5V TTL/CMOS directly |
| 1C–7C (pins 16–10) | Open-collector outputs | Sink outputs capable of 500mA each; require external pull-up or load connection to positive rail |
| COM (pin 9) | Common cathode clamp node | Must be connected to load supply rail to enable internal flyback diode operation for inductive loads |
| E (pin 8) | Common emitter | Shared ground reference for all Darlington emitters; typically tied to system GND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated clamp diodes | Eliminates need for external flyback diodes when driving relays, solenoids, or motors - reduces BOM count and PCB area |
| 2.7kΩ input resistors | Enables direct connection to 3.3V/5V microcontrollers and logic families without external current-limiting resistors |
| 7-channel parallel capability | Multiple outputs can be paralleled to support >500mA loads - e.g., two channels yield ~900mA sink capacity |
| High-voltage isolation | 50V-rated outputs allow safe interfacing between low-voltage logic and 24V/48V industrial control rails |
| Extended temperature operation | Rated from –40°C to +105°C - suitable for uncontrolled environments such as factory automation and outdoor equipment |
Applications
| Relay Control | Stepper Motor Interface |
|---|---|
Use Scenario: Driving 24V industrial relays in PLC I/O modules or HVAC control panels. IC Role / Device Role / Timing Role: Logic-level sink driver that translates MCU GPIO signals into high-current coil actuation, with internal diode clamping to suppress inductive transients. Use Value: Eliminates 7 external transistors and flyback diodes, reducing component count by ≥14 parts and simplifying layout validation. | Use Scenario: Controlling unipolar stepper motor phases in printer head positioning or CNC motion controllers. IC Role / Device Role / Timing Role: Phase driver providing synchronized current sinking across four or five windings using multiple ULN2003AIDRE4 channels. Use Value: Supports 300mA/phase at 12V with <1.3V saturation drop, enabling efficient torque delivery without heatsinking below 50% duty cycle. |
| Lamp & LED Driver | Industrial Display Interface |
Use Scenario: Switching incandescent pilot lamps and high-brightness LED arrays in operator panels and instrumentation dashboards. IC Role / Device Role / Timing Role: Constant-current sink for resistive and low-impedance LED loads, with fast turn-on/turn-off (<1μs) for PWM dimming. Use Value: Delivers stable 500mA sink per channel at 5V logic input, enabling precise brightness control without external current regulation. | Use Scenario: Driving 7-segment gas-discharge or vacuum fluorescent displays in test equipment and legacy industrial HMIs. IC Role / Device Role / Timing Role: High-voltage segment driver translating 5V microcontroller outputs to 30–50V anode supplies via open-collector topology. Use Value: Withstands 50V output swing and integrates clamp protection - avoids external HV transistors and transient suppressors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Darlington array applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ULN2003ADR | Same electrical specs and pinout; differs only in tape-and-reel packaging (DR vs DRE4) and RoHS compliance status | No functional difference; both rated –40°C to 105°C and qualified for identical use cases | Select ULN2003ADR if standard reel packaging suffices; ULN2003AIDRE4 is optimized for automated SMT placement with E4-grade moisture sensitivity |
| STMicroelectronics ULN2003D1013TR | Pin-compatible but uses 2.2kΩ input resistors; VCE(sat) slightly higher (≤1.7V @ 350mA); same 50V/500mA rating | Marginally higher power dissipation per channel; may require thermal review in high-density layouts | Prefer ULN2003AIDRE4 for tighter VCE(sat) and TI's long-term supply assurance; ULN2003D1013TR offers alternate sourcing where dual-sourcing is mandated |
Compared with ULN2003ADR and ULN2003D1013TR, ULN2003AIDRE4 provides the lowest VCE(sat) and most consistent thermal performance across temperature, making it optimal for space-constrained industrial controls where power density and reliability are prioritized over second-source flexibility.
Availability
ULN2003AIDRE4 is available at Aetrix Electronics and suitable for relay control, stepper motor interfacing, and industrial display driving requiring stable component supply, extended temperature operation, and long-lifecycle availability.
Supply support for ULN2003AIDRE4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The ULN200x family was engineered specifically for robust logic-to-load interfacing - targeting cost-sensitive, high-reliability applications where discrete transistor arrays would otherwise dominate BOM and layout complexity.
FAQ
What is the maximum continuous current per channel for ULN2003AIDRE4?
The ULN2003AIDRE4 supports 500mA maximum collector current per channel under specified thermal conditions. Actual sustainable current depends on ambient temperature, PCB copper area, and number of simultaneously active channels - for example, at 70°C ambient with SOIC package, derating curves show ~350mA per channel at 100% duty cycle. Always consult Figure 5-4 in the TI datasheet for thermal limits.
Does ULN2003AIDRE4 require external flyback diodes when driving relays?
No, ULN2003AIDRE4 does not require external flyback diodes when driving relays, provided the COM pin (pin 9) is connected to the same positive supply rail as the relay coil. The device integrates seven common-cathode clamp diodes that safely dissipate inductive energy during turn-off. Leaving COM unconnected disables this protection and risks output transistor failure.
Can ULN2003AIDRE4 be used with 3.3V microcontrollers?
Yes, ULN2003AIDRE4 is fully compatible with 3.3V microcontrollers. Its 2.7kΩ internal input resistors ensure sufficient base drive - at 3.3V input, typical input current is ~1.2mA, well within the drive capability of most modern MCUs. Verified operation includes reliable turn-on down to 2.4V input (VI(on) max = 3V @ IC = 300mA).
What is the purpose of the E pin (pin 8) on ULN2003AIDRE4?
The E pin (pin 8) is the common emitter terminal shared by all seven Darlington pairs. It must be connected to system ground (GND) to complete the current path for all sink outputs. Unlike the COM pin, E is not optional - leaving it floating prevents any channel from conducting, rendering ULN2003AIDRE4 nonfunctional.
How does ULN2003AIDRE4 differ from ULN2003AI?
ULN2003AIDRE4 is the industrial-grade version (–40°C to +105°C), while ULN2003AI is the automotive-qualified variant with identical electrical specs but enhanced AEC-Q100 stress testing and different packaging markings. Both share the same SOIC-D package, pinout, and 2.7kΩ input resistors - ULN2003AIDRE4 is preferred for industrial temperature-range applications with TI's standard qualification.
ULN2003AIDRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- ULx200xA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Switch Type:
- Relay, Solenoid Driver
- Number of Outputs:
- 7
- Ratio - Input:Output:
- 1:1
- Output Configuration:
- Low Side
- Output Type:
- Darlington
- Interface:
- Parallel
- Voltage - Load:
- 50V (Max)
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 500mA
- Rds On (Typ):
- -
- Input Type:
- Inverting
- Features:
- -
- Fault Protection:
- -
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ULN2003AIDRE4 FAQ
1.How can I place an order for ULN2003AIDRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ULN2003AIDRE4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ULN2003AIDRE4 reliable?
The price and inventory of ULN2003AIDRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ULN2003AIDRE4 is usually 5 days.
3.What payment methods are accepted for ULN2003AIDRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ULN2003AIDRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ULN2003AIDRE4?
ULN2003AIDRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ULN2003AIDRE4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ULN2003AIDRE4?
For technical support, including ULN2003AIDRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ULN2003AIDRE4 requirements.
6.How does Aetrix verify that ULN2003AIDRE4 is sourced from the original manufacturer or authorized distributors?
All ULN2003AIDRE4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ULN2003AIDRE4 meets industry standards.
7.What is the process for return or replacement of ULN2003AIDRE4?
All ULN2003AIDRE4 units undergo pre-shipment inspection (PSI). If there is an issue with ULN2003AIDRE4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ULN2003AIDRE4 part is unused and in its original packaging.
Return procedure for ULN2003AIDRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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