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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Distribution Switches, Load Drivers

Allegro MicroSystems A2982SLW-T

Name: A2982SLW-T
Brand: Allegro MicroSystems
SKU: A2982SLW-T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: A2982SLW-T

Manufacturer:: Allegro MicroSystems

Category:: Power Distribution Switches, Load Drivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: A2982SLW-T.pdf

Description:: IC PWR DRIVER BIPOLAR 1:1 20SOIC

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Product details

Overview

A2982SLW-T from Allegro MicroSystems is an 8-channel high-side source driver IC designed for interfacing 5 V logic (TTL, CMOS, DTL) with inductive or resistive loads up to 50 V and –500 mA per channel. It integrates input current-limiting resistors and output clamp diodes, features active-high inputs, and operates from –20°C to +85°C ambient.

For engineers reviewing the A2982SLW-T datasheet, A2982SLW-T pinout, A2982SLW-T application, or A2982SLW-T equivalent, key selection criteria include its 50 V output breakdown voltage, 1.6–2.0 V V_CE(SAT) at load currents up to –350 mA, transient-protected outputs, and 20-pin SOICW package with NC pins 10 and 11.

Technical Context

The A2982SLW-T implements eight independent NPN Darlington source drivers with integrated base resistors and output flyback diodes-enabling direct drive of relays, solenoids, and LEDs without external protection components. Each channel supports active-high logic control and sustains 35 V minimum output sustaining voltage (V_CE(SUS)) under load.

It is electrically pin-compatible with discontinued 18-pin SOIC variants (pins 1–9 and 12–20 match), but adds two NC pins (10, 11) and improved thermal resistance (R_JA = 90°C/W). The device requires all unused inputs tied to ground or pulled down (~10 kΩ) to prevent floating.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Channels	8 independent high-side source drivers
Max Output Voltage	50 V - supports loads up to 50 V supply rail without external clamping
Max Output Current	–500 mA per channel - enables direct drive of medium-power solenoids and lamps
V_CE(SAT)	1.6–2.0 V at –100 to –350 mA - low conduction loss reduces power dissipation and self-heating
Input Compatibility	TTL/CMOS/DTL - accepts 2.4 V logic-high threshold with 140–200 µA input current at 2.4 V
Ambient Temp Range	–20°C to +85°C - suitable for industrial control and printer electronics environments
Package Thermal R_JA	90°C/W - defines maximum power dissipation limit (e.g., ~1.5 W at 25°C ambient)

Pinout & Package

The A2982SLW-T is housed in a lead-free 20-pin wide-body SOIC (SOICW) package with 100% matte-tin leadframe plating. Pin 1 is marked by a terminal #1 indicator; pins 10 and 11 are no-connect (NC) and must remain unconnected.

Pin/Terminal	Circuit Role	Design Meaning
1–8 (IN1–IN8)	Logic Input	Active-high TTL/CMOS-compatible inputs; internal current-limiting resistors eliminate need for external series resistors
9 (V_S)	Load Supply	High-side power rail input (5–50 V); supplies all 8 output collectors
12–19 (OUT1–OUT8)	Output Source	Emitter-follower outputs sourcing current to load; integrated clamp diodes suppress inductive kickback
20 (GND)	Logic Ground	Reference for input logic and internal circuitry; separate from load ground (supports isolated grounding schemes)

Key Features

Feature	Design Value
Integrated Clamp Diodes	Eliminates need for external flyback diodes when driving relays or solenoids
Input Current-Limiting Resistors	Enables direct connection to 5 V logic without external base resistors
Separate Logic & Load Grounds	Allows galvanic isolation between control and power domains in high-noise systems
20-Pin SOICW Thermal Enhancement	90°C/W junction-to-ambient thermal resistance improves power handling vs. legacy 18-pin SOIC

Applications

Industrial Printers	PLC I/O Modules
Use Scenario: Driving print hammers and solenoid-based paper feed mechanisms in electrosensitive dot-matrix printers. IC Role / Device Role / Timing Role: High-side source driver translating microcontroller GPIO signals into 35–50 V, 350 mA pulses for mechanical actuation. Use Value: Integrated clamp diodes and low V_CE(SAT) reduce board space and improve reliability in repetitive switching cycles.	Use Scenario: Providing isolated high-side outputs for 24 V DC field devices (valves, indicators) in programmable logic controller racks. IC Role / Device Role / Timing Role: Eight-channel interface between 5 V logic backplane and industrial 24 V loads with separate ground domains. Use Value: NC pins 10/11 and pin-compatibility with legacy 18-pin versions simplify upgrade paths in existing designs.
Automated Test Equipment	Office Equipment Power Control
Use Scenario: Controlling multiple relay banks for signal routing and fixture power sequencing in benchtop ATE systems. IC Role / Device Role / Timing Role: Simultaneous or staggered sourcing of up to eight 500 mA loads with <2 µs turn-off delay for precise timing control. Use Value: Guaranteed 35 V output sustaining voltage ensures robust operation even during load transients and contact bounce.	Use Scenario: Managing lamp, fan, and motor loads in multifunction copiers and scanners requiring discrete 5–24 V power switching. IC Role / Device Role / Timing Role: High-side driver enabling single-supply logic control of grounded loads while maintaining EMI isolation via separate grounds. Use Value: Lead-free SOICW package meets RoHS compliance requirements for commercial office equipment.

Industrial Printers

PLC I/O Modules

Use Scenario: Driving print hammers and solenoid-based paper feed mechanisms in electrosensitive dot-matrix printers.

IC Role / Device Role / Timing Role: High-side source driver translating microcontroller GPIO signals into 35–50 V, 350 mA pulses for mechanical actuation.

Use Value: Integrated clamp diodes and low V_CE(SAT) reduce board space and improve reliability in repetitive switching cycles.

Use Scenario: Providing isolated high-side outputs for 24 V DC field devices (valves, indicators) in programmable logic controller racks.

IC Role / Device Role / Timing Role: Eight-channel interface between 5 V logic backplane and industrial 24 V loads with separate ground domains.

Use Value: NC pins 10/11 and pin-compatibility with legacy 18-pin versions simplify upgrade paths in existing designs.

Automated Test Equipment

Office Equipment Power Control

Use Scenario: Controlling multiple relay banks for signal routing and fixture power sequencing in benchtop ATE systems.

IC Role / Device Role / Timing Role: Simultaneous or staggered sourcing of up to eight 500 mA loads with <2 µs turn-off delay for precise timing control.

Use Value: Guaranteed 35 V output sustaining voltage ensures robust operation even during load transients and contact bounce.

Use Scenario: Managing lamp, fan, and motor loads in multifunction copiers and scanners requiring discrete 5–24 V power switching.

IC Role / Device Role / Timing Role: High-side driver enabling single-supply logic control of grounded loads while maintaining EMI isolation via separate grounds.

Use Value: Lead-free SOICW package meets RoHS compliance requirements for commercial office equipment.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side source driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ULN2803A	8-channel Darlington sink driver (not source); 50 V V_CEO, 500 mA per channel; no integrated input resistors	Requires external pull-up resistors for logic-level compatibility; suited for grounded-load topologies only	Select ULN2803A only if load is connected to V_CC and switched to GND - not a functional replacement for A2982SLW-T's high-side sourcing.
TB62786AFG	8-channel high-side driver with SPI interface; 40 V max, 350 mA per channel; built-in diagnostics and thermal shutdown	Digital control required; not compatible with direct logic-level inputs; higher system integration cost	Choose TB62786AFG where fault reporting, programmability, or tighter current regulation are required - not for simple TTL-driven on/off control.

Compared with ULN2803A and TB62786AFG, the A2982SLW-T uniquely delivers true high-side sourcing with integrated input resistors and clamp diodes in a direct-logic-compatible 20-pin SOICW package - making it optimal for cost-sensitive, high-reliability industrial switching where simplicity and proven ruggedness are prioritized.

Availability

A2982SLW-T is available at Aetrix Electronics and suitable for industrial printers, PLC I/O modules, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for A2982SLW-T 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

Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance magnetic sensors, power ICs, and precision motion-control solutions headquartered in Worcester, Massachusetts.

The A2982SLW-T belongs to Allegro's legacy high-side driver product line, engineered specifically for robust, low-complexity interfacing between standard logic families and industrial inductive loads such as relays and solenoids.

FAQ

What is the maximum load supply voltage supported by the A2982SLW-T?

The A2982SLW-T supports a maximum load supply voltage (V_S) of 50 V, with guaranteed output sustaining voltage (V_CE(SUS)) of 35 V at –45 mA. This allows safe operation with common industrial rails including 24 V DC and 48 V telecom systems, provided thermal limits are observed per the derating curve in the datasheet. The A2982SLW-T must not be operated above 50 V on V_S under any condition.

Does the A2982SLW-T require external flyback diodes when driving relays?

No, the A2982SLW-T does not require external flyback diodes. Each of its eight output channels integrates a built-in clamp diode that provides transient suppression for inductive loads like relays and solenoids. This eliminates the need for discrete diodes on the PCB, reducing component count and layout complexity. The A2982SLW-T's internal diodes are rated for clamp currents up to 50 µA leakage and forward voltage ≤2.0 V at 350 mA.

Can the A2982SLW-T be used with 3.3 V logic inputs?

The A2982SLW-T is specified for 5 V logic compatibility (TTL/CMOS/DTL) and has a minimum input high voltage (V_IN(H)) of 2.4 V. While some units may function with 3.3 V logic, Allegro does not guarantee reliable turn-on across temperature and process variation at 3.3 V due to input current dependency and lack of formal characterization. For guaranteed operation, use 5 V logic or add a level-shifting buffer. The A2982SLW-T datasheet explicitly states compatibility with "5 V logic systems" only.

What is the purpose of pins 10 and 11 on the A2982SLW-T?

Pins 10 and 11 on the A2982SLW-T are no-connect (NC) terminals. They are physically present in the 20-pin SOICW package but internally unconnected and must remain unconnected in the PCB layout. Their inclusion accommodates mechanical compatibility with the footprint of earlier 18-pin SOIC variants while allowing improved thermal performance - the A2982SLW-T remains electrically pin-compatible with those legacy parts on pins 1–9 and 12–20.

How does the thermal performance of the A2982SLW-T compare to the older 18-pin SOIC version?

The A2982SLW-T uses a 20-pin wide-body SOIC (SOICW) package with a specified junction-to-ambient thermal resistance (R_JA) of 90°C/W - an improvement over the legacy 18-pin SOIC variant. This lower R_JA enables higher continuous power dissipation at the same ambient temperature, supporting more simultaneous channel operation at full load. The A2982SLW-T's enhanced thermal characteristics are validated in Allegro's power derating graphs and allow extended duty-cycle operation in compact industrial enclosures.

A2982SLW-T Specifications

Product attributes: Attribute value

Manufacturer:: Allegro MicroSystems

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Series:: -

Packaging:: Bulk

Product Status:: Obsolete

Switch Type:: General Purpose

Number of Outputs:: 8

Ratio - Input:Output:: 1:1

Output Configuration:: High Side

Output Type:: Bipolar

Interface:: On/Off

Voltage - Load:: 5V ~ 50V

Voltage - Supply (Vcc/Vdd):: Not Required

Current - Output (Max):: 500mA

Rds On (Typ):: -

Input Type:: Non-Inverting

Features:: -

Fault Protection:: -

Operating Temperature:: -20°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

A2982SLW-T FAQ

1.How can I place an order for A2982SLW-T through Aetrix?

Please submit a Request for Quotation (RFQ) for A2982SLW-T 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 A2982SLW-T reliable?

The price and inventory of A2982SLW-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A2982SLW-T is usually 5 days.

3.What payment methods are accepted for A2982SLW-T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A2982SLW-T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for A2982SLW-T?

A2982SLW-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your A2982SLW-T 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 A2982SLW-T?

For technical support, including A2982SLW-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A2982SLW-T requirements.

6.How does Aetrix verify that A2982SLW-T is sourced from the original manufacturer or authorized distributors?

All A2982SLW-T 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 A2982SLW-T meets industry standards.

7.What is the process for return or replacement of A2982SLW-T?

All A2982SLW-T units undergo pre-shipment inspection (PSI). If there is an issue with A2982SLW-T, 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 A2982SLW-T part is unused and in its original packaging.

Return procedure for A2982SLW-T:

1.Submit a request within 90 days.

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

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