Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Bipolar Transistor Arrays

STMicroelectronics E-ULQ2003A

Name: E-ULQ2003A
Brand: STMicroelectronics
SKU: E-ULQ2003A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: E-ULQ2003A

Manufacturer:: STMicroelectronics

Category:: Bipolar Transistor Arrays

Package:: -

Datasheet:: E-ULQ2003A.pdf

Description:: TRANS 7NPN DARL 50V 500MA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,086

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

E-ULQ2003A from STMicroelectronics is a seven-channel Darlington array IC designed for high-voltage, high-current switching of inductive loads. Each channel delivers 500 mA continuous output current (600 mA peak), supports 50 V output voltage, and integrates suppression diodes. It operates across -40 °C to 105 °C and features TTL/CMOS-compatible inputs-used in automotive relay drivers and industrial solenoid control.

For engineers reviewing the E-ULQ2003A datasheet, E-ULQ2003A pinout, E-ULQ2003A application, or E-ULQ2003A equivalent, key selection criteria include output saturation voltage (≤1.6 V at 350 mA), input compatibility with 5 V logic families, integrated clamp diode performance, and AEC-Q100 qualification for automotive use.

Technical Context

The E-ULQ2003A implements seven independent open-collector Darlington pairs with common emitters and on-chip flyback diodes for inductive load protection. Its input pins are arranged opposite outputs to minimize PCB trace crosstalk and layout complexity.

It is rated for 50 V output voltage and 500 mA per channel, with thermal resistance of 120 °C/W in SO16 package. Input threshold voltage is specified at 2.4–3.0 V for reliable 5 V TTL/CMOS drive, and leakage current remains ≤100 µA at 105 °C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Output voltage	50 V - supports driving 24 V solenoids, relays, and lamps with margin against inductive kickback
Continuous output current	500 mA per channel - enables direct control of medium-power actuators without external boost stages
Saturation voltage	1.6 V max at 350 mA - limits power dissipation to ≤560 mW per channel under full load
Input compatibility	5 V TTL/CMOS - interfaces directly with microcontroller GPIOs and logic buffers without level-shifting
Operating temperature	-40 to 105 °C - meets extended industrial and under-hood automotive ambient requirements
Junction temperature	150 °C - defines absolute thermal limit for safe operation with derating above 105 °C ambient
Clamp diode VF	1.7–2.0 V at 350 mA - dissipates inductive energy efficiently while limiting voltage overshoot

Pinout & Package

Package: SO16 (Narrow) - 16-pin small-outline integrated circuit with 1.27 mm pitch, optimized for automated assembly and thermal performance (R_thJA = 120 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
1–7	Inputs (IN1–IN7)	TTL/CMOS-compatible digital inputs; each controls one Darlington channel
8	GND	Common emitter reference and substrate ground for all Darlington pairs
9–15	Outputs (OUT1–OUT7)	Open-collector Darlington outputs; each sinks up to 500 mA with integrated clamp diode cathode
16	VCC (COM)	Common anode connection for internal clamp diodes; tied to load supply rail (e.g., +24 V)

Key Features

Feature	Design Value
Seven Darlington channels	Enables compact multi-load control in single SO16 footprint-reduces board area vs. discrete transistor arrays
Integrated clamp diodes	Eliminates need for external flyback diodes when driving relays, solenoids, or motors-reducing BOM count and layout risk
Input-output pin opposition	Minimizes crossing traces on PCB; simplifies routing in dense industrial control modules
AEC-Q100 qualified	Validated for automotive applications including engine control modules and body electronics requiring -40 °C to 125 °C operation
Output paralleling support	Allows combining two or more outputs to deliver up to 1.0 A per load-extends design flexibility without redesign

Applications

Automotive Relay Driver

Industrial Solenoid Controller

Use Scenario: Driving 12 V/24 V automotive relays in body control modules for window lift, door lock, and lighting functions.

IC Role / Device Role / Timing Role: High-side switch interface between MCU GPIO and relay coil; provides current gain and inductive spike suppression.

Use Value: Eliminates external diodes and reduces component count by 7× versus discrete transistors-improving reliability and AEC-Q100 compliance.

Use Scenario: Controlling pneumatic/hydraulic solenoid valves in factory automation PLC I/O modules.

IC Role / Device Role / Timing Role: Load-switching interface between isolated digital outputs and 24 V DC solenoid coils.

Use Value: Sustains 500 mA per channel continuously at 85 °C ambient-enabling compact, fanless enclosure designs.

Thermal Print Head Driver

LED Display Multiplexer

Use Scenario: Sequencing current to individual heater elements in dot-matrix thermal printers.

IC Role / Device Role / Timing Role: Low-latency (≤1 µs turn-off) current sink for precise pulse-width-controlled heating.

Use Value: tPHL ≤1 µs ensures accurate dwell time control-critical for consistent print density and dot resolution.

Use Scenario: Row/column scanning of high-brightness LED displays in outdoor signage and industrial HMIs.

IC Role / Device Role / Timing Role: High-current column driver sinking up to 350 mA per segment with low V_CE(SAT).

Use Value: V_CE(SAT) ≤1.1 V at 200 mA minimizes power loss and self-heating during sustained display refresh cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Darlington array applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ULN2003A	Non-automotive grade; rated -20 to 85 °C; no AEC-Q100 qualification; identical pinout and electrical specs except temp range	Restricted to commercial/industrial environments without automotive thermal or reliability requirements	Select ULN2003A only if AEC-Q100 is not required and ambient stays below 85 °C
TBD62083AFG	Higher V_CEO (50 V same), but lower I_C (250 mA); includes built-in PWM enable; different pinout (16-pin SSOP)	Better suited for PWM-driven LED or stepper motor applications requiring gating control-not ideal for static relay/solenoid loads	Choose TBD62083AFG only when PWM modulation or lower current per channel is acceptable and layout allows pinout change

Compared with ULN2003A, E-ULQ2003A adds AEC-Q100 qualification and extended temperature range (-40 to 105 °C), enabling under-hood use; compared with TBD62083AFG, it offers double the per-channel current and direct pin compatibility with legacy ULN2003 designs.

Availability

E-ULQ2003A is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and thermal printer subsystems requiring stable component supply and long-term lifecycle assurance.

Supply support for E-ULQ2003A 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

E-ULQ2003A belongs to ST's high-voltage Darlington array product line, engineered specifically for robust, low-complexity switching of inductive loads in harsh environments-including automotive under-hood and factory floor applications.

FAQ

What is the maximum continuous output current per channel?

E-ULQ2003A supports 500 mA continuous output current per Darlington channel at T_A ≤ 105 °C. Peak current capability is 600 mA for short durations. Derating applies above 105 °C ambient, governed by R_thJA = 120 °C/W and maximum junction temperature of 150 °C.

Does E-ULQ2003A require external flyback diodes when driving relays?

No. E-ULQ2003A integrates clamp diodes across each Darlington output. The common anode (Pin 16) connects to the positive side of the inductive load supply, completing the flyback path internally-eliminating the need for external diodes in standard relay and solenoid configurations.

Is E-ULQ2003A pin-compatible with ULN2003A?

Yes. E-ULQ2003A shares identical pinout, electrical characteristics, and functional behavior with ULN2003A in SO16 package. The primary differences are AEC-Q100 qualification and extended operating temperature range (-40 to 105 °C), making it a drop-in upgrade for automotive and high-reliability industrial use.

What logic families can directly drive the inputs of E-ULQ2003A?

E-ULQ2003A inputs are compatible with 5 V TTL, CMOS, PMOS, and DTL logic families. VI(ON) is specified at 2.4–3.0 V, ensuring reliable turn-on with standard 5 V microcontroller GPIOs and logic buffers without external pull-ups or level shifters.

E-ULQ2003A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: -

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: 7 NPN Darlington

Current - Collector (Ic) (Max):: 500mA

Voltage - Collector Emitter Breakdown (Max):: 50V

Vce Saturation (Max) @ Ib, Ic:: 1.6V @ 500µA, 350mA

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1000 @ 350mA, 2V

Power - Max:: -

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

E-ULQ2003A FAQ

1.How can I place an order for E-ULQ2003A through Aetrix?

Please submit a Request for Quotation (RFQ) for E-ULQ2003A 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 E-ULQ2003A reliable?

The price and inventory of E-ULQ2003A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-ULQ2003A is usually 5 days.

3.What payment methods are accepted for E-ULQ2003A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-ULQ2003A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for E-ULQ2003A?

E-ULQ2003A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your E-ULQ2003A 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 E-ULQ2003A?

For technical support, including E-ULQ2003A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-ULQ2003A requirements.

6.How does Aetrix verify that E-ULQ2003A is sourced from the original manufacturer or authorized distributors?

All E-ULQ2003A 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 E-ULQ2003A meets industry standards.

7.What is the process for return or replacement of E-ULQ2003A?

All E-ULQ2003A units undergo pre-shipment inspection (PSI). If there is an issue with E-ULQ2003A, 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 E-ULQ2003A part is unused and in its original packaging.

Return procedure for E-ULQ2003A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…