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NCR321ZX

NCR321ZX

Nexperia USA Inc.
LED Driver IC 1 Output Linear Constant Current PWM Dimming 250mA SOT-223
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Overview

The NCR321ZX is a linear constant current LED driver designed to provide a stable output of up to 250mA. It features an integrated PWM input for dimming control and is housed in a SOT-223 package for effective thermal dissipation. This device is AEC-Q101 qualified, making it suitable for demanding automotive and industrial environments requiring precise current regulation without the EMI concerns of switching regulators.

Why Choose This Part

The NCR321ZX offers a simple, low-part-count solution for LED driving with a maximum supply voltage of 16V. Its linear topology eliminates the need for inductors, reducing both PCB footprint and electromagnetic interference. The high operating temperature tolerance up to 150C and AEC-Q101 qualification ensure long-term stability in harsh thermal environments.

Applications

Automotive Interior Lighting
Driving LEDs for dashboard backlighting, instrumentation, and cabin ambient lighting where AEC-Q101 reliability is required.
Constant Current Source
Acting as a generic stabilized current source for sensors or low-power circuits requiring up to 250mA.
External Vehicle Lighting
Reliable current control for license plate lamps and marker lights with a wide operating temperature range of -55C to 150C.
High-Current Parallel Arrays
Paralleling multiple NCR321ZX drivers to increase total stabilized output current for larger LED modules.

Key Specifications

Type Linear
Dimming PWM
Topology Constant Current
Mounting Type Surface Mount
Package / Case TO-261-4, TO-261AA
Voltage - Output 16V
Number of Outputs 1
Internal Switch(s) Yes
Operating Temperature -55degC ~ 150degC (TA)
Voltage - Supply (Max) 16V
Supplier Device Package SOT-223
Current - Output / Channel 250mA

Getting Started

To implement the NCR321ZX, provide a stable supply voltage up to 16V and connect the PWM pin to a microcontroller GPIO for dimming control. Ensure the SOT-223 package has adequate copper pour area on the PCB to manage thermal dissipation, as the power loss is calculated as (Vsup - Vout) * Iout. For higher currents, multiple units can be placed in parallel with synchronized PWM signals.

Also Consider

NCR320ZX Nexperia - Lower current version of the same family suitable for applications requiring only 10mA to 250mA with similar SOT-223 thermals.
AL1792 DIODiodes Incorporated - Offers dual-channel constant current regulation for applications requiring independent control of two LED strings.