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

STMicroelectronics ULQ2802A

Name: ULQ2802A
Brand: STMicroelectronics
SKU: ULQ2802A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ULQ2802A

Manufacturer:: STMicroelectronics

Category:: Bipolar Transistor Arrays

Package:: 18-DIP (0.300", 7.62mm)

Datasheet:: ULQ2802A.pdf

Description:: TRANS 8NPN DARL 50V 500MA 18DIP

Quantity:: RFQ Add To RFQ list

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Inventory:897

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Product details

Overview

ULQ2802A from STMicroelectronics is an eight-channel Darlington array optimized for driving 14–25 V PMOS loads, featuring integrated suppression diodes, 500 mA continuous output current per channel, 50 V off-state voltage rating, and a 10.5 kΩ input resistor with Zener clamping. It operates across –40 to +105 °C and is used in industrial relay drivers and solenoid control interfaces.

For engineers reviewing the ULQ2802A datasheet, ULQ2802A pinout, ULQ2802A application, or ULQ2802A equivalent, key selection criteria include input resistor value (10.5 kΩ), Zener-clamped input for 14–25 V PMOS compatibility, output paralleling capability, and DIP-18 input-opposite-output layout optimization.

Technical Context

The ULQ2802A integrates eight independent Darlington pairs with common-emitter outputs and monolithically embedded flyback diodes for inductive load protection. Each channel supports 600 mA peak current and withstands 50 V V_CE in blocking state.

Its input stage includes a 10.5 kΩ series resistor and Zener clamp to limit input current and enable direct interfacing with 14–25 V PMOS logic sources without external components. The device is rated for operation up to +105 °C ambient and features guaranteed leakage performance at elevated temperature (≤500 µA at 105 °C, V_CE = 50 V).

Key Specifications

Parameter	Value and Actual Design Meaning
Output channels	8 independent Darlington drivers with common emitters
Continuous output current	500 mA per channel - supports medium-power relays and solenoids
Off-state output voltage	50 V - compatible with 24 V industrial control rails with margin
Input configuration	10.5 kΩ resistor + Zener clamp - enables direct 14–25 V PMOS interface
Operating temperature	–40 to +105 °C - qualified for extended industrial environments
V_CE(sat) @ 350 mA	1.3–1.6 V - low saturation loss improves power efficiency and thermal margin
Input current @ 17 V	0.82–1.25 mA - defines drive strength and logic compatibility

Pinout & Package

ULQ2802A is housed in a standard 18-lead plastic DIP (Dual In-line Package) with copper leads and ECOPACK® compliance. Its input-opposite-output pinout minimizes PCB trace crossovers and simplifies routing in high-density driver applications.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 7, 9, 11, 13, 15	Inputs (IN1–IN8)	Logic-level inputs with internal 10.5 kΩ resistor and Zener clamp for 14–25 V PMOS compatibility
2, 4, 6, 8, 10, 12, 14, 16	Outputs (OUT1–OUT8)	Common-emitter Darlington collectors - each drives inductive loads with integrated clamp diode
17	COM	Common emitter connection point for all eight Darlingtons
18	GND	Ground reference for input bias and thermal path

Key Features

Feature	Design Value
Integrated clamp diodes	Monolithic flyback diodes per channel eliminate need for external snubbers in relay/solenoid drive
Input-opposite-output layout	Reduces PCB routing complexity and parasitic inductance in multi-channel driver designs
Output paralleling support	Enables current sharing across multiple channels to achieve >500 mA per load
Zener-clamped input stage	Ensures safe operation with 14–25 V PMOS logic without external voltage limiting
Extended temperature range	Rated for full electrical performance from –40 to +105 °C ambient

Applications

Industrial Relay Driver

PLC Output Module

Use Scenario: Driving 24 V DC electromechanical relays in factory automation panels.

IC Role / Device Role / Timing Role: High-current Darlington switch with integrated flyback protection per channel.

Use Value: Eliminates discrete diode placement and reduces board area by 30% versus discrete transistor+diode solutions.

Use Scenario: Providing isolated digital output stages in modular programmable logic controllers.

IC Role / Device Role / Timing Role: Eight-channel buffered output driver with common-emitter sinking architecture.

Use Value: Supports hot-swap capable outputs with ≤1.6 V V_CE(sat) at 350 mA, minimizing heat generation in dense I/O modules.

Solenoid Control Interface

Automated Test Equipment (ATE)

Use Scenario: Actuating pneumatic valves in HVAC and process control systems.

IC Role / Device Role / Timing Role: Inductive load switch with built-in energy recirculation path.

Use Value: Clamp diode limits voltage spikes to ≤50 V, protecting downstream logic and enabling reliable 100 kHz switching.

Use Scenario: Controlling fixture actuators and signal routing relays in semiconductor test handlers.

IC Role / Device Role / Timing Role: Logic-compatible Darlington array with fast turn-on/turn-off (0.25–1 µs delay).

Use Value: Enables precise timing control of mechanical actuation with <1 µs propagation uncertainty across all eight channels.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ULN2803A	No Zener clamp; 2.7 kΩ input resistor optimized for 5 V TTL/CMOS	Requires external level-shifting for 14–25 V PMOS inputs	Select when interfacing with 5 V microcontrollers or FPGAs without PMOS drivers
ULQ2804A	10.5 kΩ input resistor but no Zener; rated for 6–15 V CMOS/PMOS	Lacks overvoltage protection above 15 V; lower input voltage ceiling	Select for 12 V automotive body control modules where Zener clamping is unnecessary

Compared with ULN2803A and ULQ2804A, the ULQ2802A uniquely combines Zener-based input protection with 14–25 V PMOS compatibility-making it the only choice for unregulated industrial PMOS gate drivers requiring robust input fault tolerance.

Availability

ULQ2802A is available at Aetrix Electronics and suitable for industrial relay drivers, PLC output modules, solenoid control interfaces, and automated test equipment requiring stable component supply across extended temperature ranges.

Supply support for ULQ2802A 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The ULQ280x family was developed specifically to simplify high-voltage, high-current digital output staging in industrial control systems-replacing discrete transistor-diode combinations with integrated, thermally robust Darlington arrays.

FAQ

Can ULQ2802A drive 24 V relays directly from a PMOS output?

Yes. ULQ2802A's 10.5 kΩ input resistor and integrated Zener clamp allow direct connection to 14–25 V PMOS logic outputs without external components. Input current remains within 0.82–1.25 mA at 17 V, ensuring safe biasing while maintaining full output drive capability.

What is the maximum safe continuous current per channel?

The ULQ2802A is rated for 500 mA continuous collector current per channel at T_A ≤ 85 °C. At 105 °C ambient, derating applies: maximum continuous current drops to approximately 350 mA to maintain junction temperature below 150 °C with R_thJA = 55 °C/W.

Does ULQ2802A support paralleling outputs for higher current?

Yes. Outputs can be paralleled to increase total current capacity-e.g., two channels deliver ~1 A continuous with matched V_CE(sat) and shared COM connection. Thermal balance must be ensured via symmetrical PCB copper pour and equal trace lengths.

How does the integrated clamp diode function during inductive turn-off?

During turn-off, stored energy in the inductive load forward-biases the monolithic clamp diode, recirculating current through the Darlington's emitter-collector path. This limits V_CE to ≤2 V above COM, preventing destructive voltage spikes and eliminating need for external diodes.

ULQ2802A Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 18-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Active

Transistor Type:: 8 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:: 2.25W

Frequency - Transition:: -

Operating Temperature:: -40°C ~ 105°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 18-DIP

ULQ2802A FAQ

1.How can I place an order for ULQ2802A through Aetrix?

Please submit a Request for Quotation (RFQ) for ULQ2802A 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 ULQ2802A reliable?

The price and inventory of ULQ2802A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ULQ2802A is usually 5 days.

3.What payment methods are accepted for ULQ2802A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ULQ2802A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ULQ2802A?

ULQ2802A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ULQ2802A 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 ULQ2802A?

For technical support, including ULQ2802A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ULQ2802A requirements.

6.How does Aetrix verify that ULQ2802A is sourced from the original manufacturer or authorized distributors?

All ULQ2802A 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 ULQ2802A meets industry standards.

7.What is the process for return or replacement of ULQ2802A?

All ULQ2802A units undergo pre-shipment inspection (PSI). If there is an issue with ULQ2802A, 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 ULQ2802A part is unused and in its original packaging.

Return procedure for ULQ2802A:

1.Submit a request within 90 days.

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

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