STMicroelectronics E-ULQ2003D1

Overview

E-ULQ2003D1 from STMicroelectronics is an automotive-grade seven-channel Darlington array in SO16 package, designed for high-voltage switching of inductive loads. Each channel delivers 500 mA continuous / 600 mA peak output current, withstands 50 V output voltage, and integrates clamp diodes. It operates from -40 °C to 105 °C ambient and interfaces directly with 5 V TTL/CMOS logic-commonly used in automotive body control modules for relay and solenoid driving.

For engineers reviewing the E-ULQ2003D1 datasheet, E-ULQ2003D1 pinout, E-ULQ2003D1 application, or E-ULQ2003D1 equivalent, key selection criteria include output current capability per channel, integrated flyback diode functionality, AEC-Q100 qualification status, SO16 thermal performance, and input compatibility with 5 V logic families.

Technical Context

The E-ULQ2003D1 implements seven independent open-collector NPN Darlington pairs with common emitters and monolithically integrated suppression diodes across each output. Its input structure is optimized for 5 V TTL/CMOS logic levels, with VI(ON) specified at 2.4–3.0 V (IC = 200–300 mA), and II(ON) at 0.93–1.35 mA.

It supports parallel operation of outputs for higher current drive and features low saturation voltage (VCE(SAT) = 0.9–1.6 V across 100–350 mA), fast switching (tPLH/tPHL ≤ 1 µs), and robust thermal design validated for automotive ambient conditions up to 105 °C with RthJA = 120 °C/W in SO16.

Key Specifications

Pinout & Package

Package: SO16 (Narrow), 16-pin small outline, ECOPACK® compliant, with 1.27 mm pitch and 10 mm × 4 mm footprint. Thermal resistance junction-to-ambient is 120 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ULN2003A and TBD62083AFG, E-ULQ2003D1 uniquely combines AEC-Q100 qualification, integrated clamp diodes, and SO16 packaging-making it the only drop-in solution for thermally constrained, safety-critical automotive relay/solenoid control without redesigning protection circuitry.

Availability

E-ULQ2003D1 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC output stages, thermal printer subsystems, and LED signage power switching requiring stable component supply across multi-year production cycles.

Supply support for E-ULQ2003D1 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

E-ULQ2003D1 belongs to ST's ULQ family of automotive-qualified Darlington arrays, engineered specifically for robust, high-reliability switching of inductive loads in harsh environments-targeting body electronics, chassis systems, and powertrain auxiliary controls.

FAQ

Is E-ULQ2003D1 pin-compatible with ULN2003A?

Yes-E-ULQ2003D1 shares identical pin numbering and function mapping with ULN2003A, including IN1–IN7, GND, OUT1–OUT7, and VCC. However, the SO16 package differs mechanically from ULN2003A's DIP-16, requiring PCB layout adaptation despite functional equivalence.

What is the maximum safe operating voltage on Pin 16 (VCC)?

Pin 16 (VCC) must be connected to the inductive load's positive supply rail, which may be up to 50 V. This rail powers the internal clamp diodes; exceeding 50 V risks diode breakdown and permanent damage. For 24 V automotive systems, connect Pin 16 directly to the 24 V bus.

Can multiple outputs be paralleled to drive a single 1 A load?

Yes-ST confirms output paralleling in Application Note AN2493. Paralleling two channels yields ~1 A continuous (derated for thermal limits), provided traces are symmetrical and VCE(SAT) mismatch is minimized. Do not exceed 1200 mA total to avoid exceeding junction temperature limits in SO16.

Does E-ULQ2003D1 require external base resistors on inputs?

No-inputs are internally biased for direct 5 V TTL/CMOS compatibility. ST specifies II(ON) = 0.93–1.35 mA at VI = 3.85 V, confirming sufficient current drive from standard microcontroller GPIOs without series resistors. External resistors are unnecessary unless current limiting is needed for non-standard logic sources.