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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Nexperia USA Inc. NCR421UX

Name: NCR421UX
Brand: Nexperia USA Inc.
SKU: NCR421UX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCR421UX

Manufacturer:: Nexperia USA Inc.

Category:: LED Drivers

Package:: SC-74, SOT-457

Datasheet:: NCR421UX.pdf

Description:: IC LED DRVR LIN PWM 150MA 6TSOP

Quantity:: RFQ Add To RFQ list

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Inventory:5,078

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Product details

Overview

NCR421UX from Nexperia is an AEC-Q101-qualified resistor-equipped NPN transistor LED driver in SOT457 (SC-74/TSOP6) package, delivering stabilized 10 mA output current without external components and adjustable up to 150 mA with R_EXT. It features digital PWM dimming support up to 10 kHz, 1.4 V low voltage overhead, and operates from 3.3 V enable input - designed for automotive interior lighting, dashboard illumination, and number plate lamps.

For engineers reviewing the NCR421UX datasheet, NCR421UX pinout, NCR421UX application, or NCR421UX equivalent, key selection criteria include enable voltage compatibility (≤4.5 V), thermal derating on FR4 PCBs, PWM dimming timing constraints, and parallel configuration requirements for >150 mA loads.

Technical Context

The NCR421UX integrates a precision current-regulating NPN transistor with two on-die diodes and internal biasing resistors (1.5 kΩ), enabling stable current source behavior independent of V_CC variation. Its enable input accepts logic-level signals up to 4.5 V, supporting direct microcontroller interfacing without level-shifting.

Current regulation relies on internal feedback via emitter degeneration and temperature-compensated reference design, achieving ±1% supply voltage sensitivity and −0.27%/K temperature drift. Output current scales inversely with externally connected R_EXT, allowing precise tuning between 10 mA (open) and 150 mA (5.1 Ω).

Key Specifications

Parameter	Value and Actual Design Meaning
Stabilized I_OUT	10 mA (typ) at V_EN = 3.3 V, no R_EXT; enables consistent LED brightness without calibration
Max Adjustable I_OUT	150 mA with R_EXT = 5.1 Ω; supports high-brightness single-LED or multi-LED strings
Voltage Overhead	1.4 V min; allows operation with low-V_F LEDs (e.g., red/orange) even at low supply rails
Enable Voltage (V_EN)	≤4.5 V max; compatible with 3.3 V GPIOs and avoids need for external level shifters
PWM Frequency Support	Up to 10 kHz; enables flicker-free dimming without audible noise in automotive cabin environments
AEC-Q101 Qualified	Validated for automotive temperature range (−40 °C to +150 °C junction); suitable for under-hood and interior modules
Power Dissipation	750 mW (4-layer FR4 PCB); defines maximum continuous I_OUT × V_OVERHEAD under thermal limits

Pinout & Package

SOT457 (SC-74/TSOP6) plastic surface-mounted package with 6 leads; 1.1 mm height, 3.1 mm × 2.7 mm footprint, 0.95 mm lead pitch.

Pin/Terminal	Circuit Role	Design Meaning
1	VEN	Logic-level enable input; active-high, ≤4.5 V absolute max; controls device on/off and PWM dimming
2	IOUT	Output current terminal; connects to LED anode or cathode depending on topology (common-emitter)
3	IOUT	Redundant output terminal; paralleled internally with Pin 2 to reduce bond wire resistance and improve current sharing
4	GND	Ground reference for bias network and current sensing; must be low-impedance return path
5	IOUT	Third output terminal; provides additional current path capacity and thermal spreading for high-I_OUT operation
6	REXT	External resistor connection node; sets output current magnitude via I_OUT ≈ 0.95 V / R_EXT

Key Features

Feature	Design Value
Integrated bias resistor	1.5 kΩ internal R_B eliminates external base drive components and reduces BOM count
Low thermal drift	−0.27 %/K current drift ensures stable LED intensity across automotive ambient ranges
High power dissipation	750 mW rating on 4-layer FR4 enables 150 mA @ 5 V overhead without heatsinking
Digital PWM interface	Direct 10 kHz PWM capability simplifies microcontroller-based dimming without analog DAC or external drivers
Parallel-ready architecture	Matched output characteristics allow identical NCR421UX units to share load current evenly when R_EXT values are equal

Applications

Automotive Interior Lighting

Dashboard Backlighting

Use Scenario: Illuminating door handle LEDs, footwell lights, and map reading lamps in passenger cabins.

IC Role / Device Role / Timing Role: Constant-current source regulating individual or grouped white/amber LEDs.

Use Value: Maintains consistent luminance across battery voltage swings (9–16 V) and temperature extremes (−40 °C to +85 °C ambient).

Use Scenario: Driving segmented backlight arrays behind TFT-LCD instrument clusters.

IC Role / Device Role / Timing Role: PWM-dimmable current sink enabling dynamic contrast adjustment synchronized to display content.

Use Value: 10 kHz PWM support prevents visible flicker and eliminates coil whine in proximity to audio systems.

Number Plate Lamp

Automotive Switch Illumination

Use Scenario: Powering EU-compliant rear license plate illumination meeting ECE R87 photometric requirements.

IC Role / Device Role / Timing Role: Stable 100–150 mA current source driving high-luminance LEDs at fixed or dimmed output.

Use Value: AEC-Q101 qualification ensures reliability over 15-year vehicle service life with minimal thermal derating.

Use Scenario: Providing uniform glow for tactile push-button and rotary switch indicators in center consoles.

IC Role / Device Role / Timing Role: Low-overhead (1.4 V) current regulator enabling use with low-V_F red/green indicator LEDs.

Use Value: Eliminates need for discrete current-limiting resistors, reducing PCB area by >30% per switch channel.

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSI45020AZT1G	Fixed 20 mA output; no R_EXT adjustability; 2.5 V min overhead; no PWM enable	Only suitable for non-dimming, fixed-brightness indicator LEDs	Select when simplicity and lowest cost outweigh dimming flexibility and higher current needs
ROHM BD15GA5WEFJ-E2	Adjustable 5–150 mA via external resistor; 1.8 V overhead; 5 V max V_IN; no AEC-Q101 rating	Limited to 12 V systems; not qualified for automotive under-hood or safety-critical locations	Prefer for industrial or consumer lighting where AEC-Q101 is not mandated and board space permits larger SO8 package

Compared with NSI45020AZT1G and BD15GA5WEFJ-E2, the NCR421UX uniquely combines AEC-Q101 qualification, 3.3 V logic-compatible enable, 1.4 V overhead, and 150 mA adjustability in a 6-pin TSOP6 package - making it the only option qualified for demanding automotive interior lighting with full dimming control.

Availability

NCR421UX is available at Aetrix Electronics and suitable for automotive interior lighting, dashboard backlighting, number plate lamps, and switch illumination requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for NCR421UX 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete, logic, and MOSFET devices for automotive, industrial, and mobile markets.

The NCR42xU series belongs to Nexperia's AEC-Q101-qualified LED driver portfolio, engineered specifically for robust, low-component-count constant-current solutions in automotive cabin lighting and instrumentation systems.

FAQ

What is the minimum enable voltage required to turn on the NCR421UX?

The NCR421UX does not specify a minimum enable voltage threshold; it activates fully when V_EN exceeds approximately 1.2 V (typical enable current onset), but guaranteed operation begins at V_EN ≥ 2.0 V per characterization data. For reliable switching, drive V_EN between 2.5 V and 3.3 V using standard microcontroller GPIOs.

Can multiple NCR421UX devices be paralleled to increase total output current?

Yes - the NCR421UX supports parallel operation with matched R_EXT values to scale output current linearly (e.g., two units with 10 Ω each deliver ~150 mA total). Thermal coupling and PCB copper area must be balanced across devices to ensure current sharing within ±10%, as confirmed in Figure 26 of the datasheet.

Does the NCR421UX require an external flyback diode when driving inductive LED loads?

No - the NCR421UX contains two integrated diodes on-die (per General Description), which provide internal clamping during switching transients. These diodes eliminate the need for external flyback protection when used in standard constant-current LED configurations with capacitive or resistive loads.

How does ambient temperature affect output current accuracy in the NCR421UX?

Output current drift is specified as −0.27 %/K over −40 °C to +125 °C junction temperature. At 85 °C ambient (with typical PCB thermal resistance), I_OUT decreases by approximately 1.6% versus 25 °C baseline - verified in Figures 16–18. This predictable, linear coefficient enables software compensation in closed-loop systems.

NCR421UX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: SC-74, SOT-457

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Linear

Topology:: Linear

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: -

Voltage - Supply (Max):: 40V

Voltage - Output:: 40V

Current - Output / Channel:: 150mA

Frequency:: -

Dimming:: PWM

Applications:: -

Operating Temperature:: -55°C ~ 150°C (TA)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: 6-TSOP

NCR421UX FAQ

1.How can I place an order for NCR421UX through Aetrix?

Please submit a Request for Quotation (RFQ) for NCR421UX 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 NCR421UX reliable?

The price and inventory of NCR421UX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCR421UX is usually 5 days.

3.What payment methods are accepted for NCR421UX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCR421UX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCR421UX?

NCR421UX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCR421UX 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 NCR421UX?

For technical support, including NCR421UX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCR421UX requirements.

6.How does Aetrix verify that NCR421UX is sourced from the original manufacturer or authorized distributors?

All NCR421UX 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 NCR421UX meets industry standards.

7.What is the process for return or replacement of NCR421UX?

All NCR421UX units undergo pre-shipment inspection (PSI). If there is an issue with NCR421UX, 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 NCR421UX part is unused and in its original packaging.

Return procedure for NCR421UX:

1.Submit a request within 90 days.

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

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