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

Nexperia USA Inc. NCR420UX

Name: NCR420UX
Brand: Nexperia USA Inc.
SKU: NCR420UX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCR420UX

Manufacturer:: Nexperia USA Inc.

Category:: LED Drivers

Package:: SC-74, SOT-457

Datasheet:: NCR420UX.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:1,838

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Product details

Overview

NCR420UX from Nexperia is a resistor-equipped NPN transistor LED driver with integrated diodes in SOT457 (SC-74/TSOP6) package, delivering stabilized 10 mA output current without external components and up to 150 mA with R_EXT. It features 1.4 V low voltage overhead, 40 V max supply voltage, and AEC-Q101 qualification for automotive interior lighting and instrumentation.

For engineers reviewing the NCR420UX datasheet, NCR420UX pinout, NCR420UX application, or NCR420UX equivalent, key selection criteria include enable voltage range (0–40 V), thermal resistance (115–265 K/W depending on PCB layout), current accuracy over temperature (−0.27 %/K), and PWM compatibility via external control of VEN pin.

Technical Context

This device integrates an NPN transistor, two diodes, and an internal bias resistor (20 kΩ) on a single die to form a constant-current sink. Its operation relies on emitter-follower configuration with current regulation determined by internal resistor and optional external R_EXT, enabling stable LED drive across supply variations.

The 1.4 V minimum output voltage overhead allows operation with short LED strings while maintaining regulation. Thermal performance is defined for multiple PCB configurations-standard FR4 single-layer (265 K/W), 4-layer (115 K/W), and collector pad variants-supporting design flexibility in power dissipation management.

Key Specifications

Parameter	Value and Actual Design Meaning
Stabilized I_OUT	10 mA (typical, no R_EXT) - ensures consistent LED brightness without external tuning
Max I_OUT with R_EXT	150 mA - supports high-brightness LEDs or parallel strings when R_EXT = 5.1 Ω
Voltage overhead	1.4 V - enables use with low-V_F LEDs (e.g., red/orange) or short series strings
Supply voltage range	0–40 V - compatible with 12 V/24 V automotive systems and industrial DC supplies
Enable voltage (V_EN)	0–40 V - direct connection to battery rail; no level-shifting required
Thermal resistance (R_th(j-a))	115 K/W (4-layer PCB) - defines maximum ambient temperature for 750 mW continuous operation
AEC-Q101 qualified	Yes - validated for automotive interior lighting per stress test requirements

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	Enable input - high-impedance control node; sinking ~1.2 mA at 24 V enables regulation
2	IOUT	Current sink output - connects to LED cathode; shares current path with pins 3 and 5
3	IOUT	Current sink output - paralleled with pins 2 and 5 to increase current handling capability
4	GND	Ground reference - common return for internal diodes and bias network
5	IOUT	Current sink output - third parallel output terminal for enhanced thermal distribution
6	REXT	External resistor connection - sets adjustable current range (10–150 mA) when tied to GND

Key Features

Feature	Design Value
Integrated bias resistor	20 kΩ - eliminates need for external base resistor in basic 10 mA configuration
Low thermal resistance option	115 K/W on 4-layer PCB - enables 750 mW continuous dissipation at +85 °C ambient
Current stability vs. supply	±1 %/V - maintains LED brightness across battery voltage fluctuations (e.g., 11–14.5 V cold-crank)
Current stability vs. temperature	−0.27 %/K - predictable drift enables accurate thermal derating in dashboards
Parallel operation support	Matched output terminals (pins 2/3/5) - allows doubling current capacity and thermal load sharing

Applications

Automotive Interior Lighting

Dash Instrumentation

Use Scenario: Illumination of door map lights, footwell lamps, and courtesy lighting in passenger compartments.

IC Role / Device Role / Timing Role: Constant-current sink regulating LED string brightness independent of 12 V battery variation.

Use Value: Eliminates brightness flicker during engine start-up and ensures consistent luminance across vehicle life cycle.

Use Scenario: Backlighting of analog gauges, digital displays, and warning indicators in instrument clusters.

IC Role / Device Role / Timing Role: Precision current source driving multiple parallel LED segments with matched intensity.

Use Value: Prevents visual disparity between indicators and enables compliance with automotive photometric uniformity standards.

Number Plate Light

Industrial Panel Indicators

Use Scenario: EU/UNECE-compliant rear license plate illumination meeting luminance and color temperature requirements.

IC Role / Device Role / Timing Role: Regulated current driver operating from unregulated 12 V vehicle supply with minimal BOM count.

Use Value: Reduces component count versus discrete transistor+resistor solutions while maintaining AEC-Q101 reliability.

Use Scenario: Status indication on factory HMIs, PLC modules, and control panels exposed to wide ambient temperatures.

IC Role / Device Role / Timing Role: Stable current source compensating for LED forward voltage drift over −40 °C to +85 °C.

Use Value: Ensures operator-visible indicator brightness remains within specification across industrial operating environments.

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	20 mA fixed current; no R_EXT adjustment; 45 V max V_CC; SOD-123FL package	Limited to low-current indicator LEDs; lacks parallelization capability and automotive qualification	Select when only 20 mA is needed and board space is constrained; not suitable for 150 mA or AEC-Q101 designs
ROHM BD18337EFV-M	Adjustable 10–120 mA; built-in PWM dimming; HTSOP-J8 package; 40 V max V_CC	Requires external PWM signal; larger 8-pin package; higher cost; includes thermal shutdown	Choose when active dimming control and fault protection are required; avoid if simple on/off enable suffices

Compared with NCR420UX, NSI45020AZT1G offers smaller footprint but sacrifices adjustability and automotive qualification, while BD18337EFV-M adds dimming and protection at the cost of complexity and size-making NCR420UX optimal for cost-sensitive, high-reliability 10–150 mA automotive LED sinks.

Availability

NCR420UX is available at Aetrix Electronics and suitable for automotive interior lighting, dash instrumentation, and number plate light applications requiring stable component supply, AEC-Q101 compliance, and long-term production continuity.

Supply support for NCR420UX 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 logic, discrete, and MOSFET devices with emphasis on automotive and industrial reliability.

The NCR420U product line delivers integrated constant-current LED drivers optimized for automotive cabin lighting, combining AEC-Q101 qualification, low overhead voltage, and parallel-ready architecture for scalable LED system design.

FAQ

What is the function of pin 6 (REXT) on the NCR420UX?

Pin 6 connects to an external resistor (R_EXT) tied to GND to adjust the output current from the default 10 mA up to 150 mA. The value of R_EXT directly determines the regulated current magnitude, with 5.1 Ω yielding ~150 mA at 24 V supply. No R_EXT connection defaults to internal 10 mA regulation.

Can NCR420UX be used in PWM dimming applications?

NCR420UX supports PWM dimming indirectly by toggling the VEN pin (pin 1) at frequencies up to 10 kHz, though it lacks dedicated PWM input circuitry like the NCR421U variant. Enable/disable cycling must respect minimum pulse width (≤300 µs) and duty cycle limits to maintain regulation stability and avoid thermal stress.

How does thermal performance vary with PCB construction?

Thermal resistance ranges from 115 K/W (4-layer FR4 with collector pad) to 265 K/W (single-layer FR4 standard footprint). This means power dissipation capability drops from 750 mW to ~340 mW at +25 °C ambient. Layout must match the intended thermal rating-especially critical in enclosed automotive housings where ambient exceeds 85 °C.

Is NCR420UX pin-compatible with NCR421U?

Yes-both share identical SOT457 pinout and mechanical footprint. However, NCR421U uses a 1.5 kΩ internal bias resistor and 4.5 V max V_EN, making it incompatible with direct 24 V enable drive. Interchange requires verifying enable voltage compatibility and recalculating R_EXT values for target current.

NCR420UX 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

NCR420UX FAQ

1.How can I place an order for NCR420UX through Aetrix?

Please submit a Request for Quotation (RFQ) for NCR420UX 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 NCR420UX reliable?

The price and inventory of NCR420UX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCR420UX is usually 5 days.

3.What payment methods are accepted for NCR420UX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCR420UX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCR420UX?

NCR420UX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCR420UX 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 NCR420UX?

For technical support, including NCR420UX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCR420UX requirements.

6.How does Aetrix verify that NCR420UX is sourced from the original manufacturer or authorized distributors?

All NCR420UX 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 NCR420UX meets industry standards.

7.What is the process for return or replacement of NCR420UX?

All NCR420UX units undergo pre-shipment inspection (PSI). If there is an issue with NCR420UX, 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 NCR420UX part is unused and in its original packaging.

Return procedure for NCR420UX:

1.Submit a request within 90 days.

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

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