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

Nexperia USA Inc. NCR402TR

Name: NCR402TR
Brand: Nexperia USA Inc.
SKU: NCR402TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NCR402TR

Manufacturer:: Nexperia USA Inc.

Category:: LED Drivers

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: NCR402TR.pdf

Description:: IC LED DRVR LINEAR 20MA TO236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NCR402TR from Nexperia is a resistor-equipped PNP transistor-based constant-current LED driver with integrated diodes, configured as a single-chip solution in SOT23 (TO-236AB) package. It delivers stabilized 20 mA output current at 10 V supply and 8.6 V output voltage, with ±15% tolerance over temperature and supply variation, and is qualified to AEC-Q101 for automotive use.

For engineers reviewing the NCR402TR datasheet, NCR402TR pinout, NCR402TR application, or NCR402TR equivalent, this device serves as a compact, board-space-saving constant-current source where supply voltage stability, thermal drift control (−0.3 %/K), and automotive-grade reliability are critical selection criteria.

Technical Context

The NCR402TR integrates a PNP transistor with on-die biasing resistors and two diodes to form a self-regulating current source topology. Its operation relies on internal voltage referencing and emitter-degeneration to maintain current accuracy across supply (10–18 V) and load voltage (up to 16 V) ranges.

It exhibits negative thermal coefficient behavior (−0.3 %/K), causing output current to decrease with rising ambient temperature - a known characteristic mitigated by layout-aware thermal management. Ground current remains low (420 µA typ.) and stable under zero-load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output current	20 mA typical (17–23 mA range); enables consistent LED brightness without external feedback loop
Supply voltage	Up to 18 V max; supports 12 V automotive systems with margin for transients
Output voltage headroom	1.4 V typical (VSUP − VO); defines minimum voltage drop needed to sustain regulation
Current tempco	−0.3 %/K; quantifies predictable current reduction with junction heating, aiding thermal design
Ground current	420 µA typical at 10 V supply and zero load; contributes minimally to system quiescent power
Supply sensitivity	+0.8 %/V; indicates small positive current shift per volt increase in VSUP, easing supply tolerance analysis
Junction temperature	Rated to 150 °C; enables operation in under-hood automotive environments with proper PCB copper area

Pinout & Package

Package: TO-236AB (SOT23), 3-lead plastic surface-mount package with standard footprint (2.8 × 1.4 mm body, 0.95 mm height), optimized for reflow soldering on FR4 PCBs with single-sided copper.

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Reference node for internal bias network; must be connected to low-impedance ground plane for stable current regulation
2	VSUP	Positive supply input; accepts up to 18 V DC; internal circuitry draws only 420 µA when output is off
3	IO/VO	Current-source output terminal; connects directly to LED anode (or cathode in high-side configuration); voltage at this pin is load-dependent up to 16 V

Key Features

Feature	Design Value
Stabilized output current	20 mA ±15% over temperature and supply; eliminates need for external current-sense resistor and op-amp
AEC-Q101 qualification	Qualified for automotive applications per Stress Test Qualification for Discrete Semiconductors; supports under-hood deployment
Reduced component count	Replaces discrete PNP + two diodes + base resistor network; cuts BOM line items and assembly steps
Thermal derating support	Specified power dissipation (400 mW at 25 °C ambient) and R_th(j-a) (312 K/W with 1 cm² collector pad) enable precise thermal margining

Applications

Automotive Interior Lighting

Dashboard Backlighting

Use Scenario: Driving white LEDs in instrument cluster backlight modules exposed to −40 °C to +85 °C ambient.

IC Role / Device Role / Timing Role: Constant-current source regulating LED string current independent of battery voltage fluctuations (9–16 V).

Use Value: Maintains uniform luminance across temperature and supply range without closed-loop compensation circuitry.

Use Scenario: Powering segmented edge-lit LCD backlights in center console displays.

IC Role / Device Role / Timing Role: High-side current sink delivering stable 20 mA per LED segment, enabling PWM dimming via external switch.

Use Value: Eliminates current mismatch between segments caused by V_BE spread in discrete transistor solutions.

LED Status Indicators

Industrial Control Panel Lighting

Use Scenario: Single-color status indicators on PCBs in industrial HMIs with limited board space.

IC Role / Device Role / Timing Role: Low-component-count LED driver replacing resistor-transistor combinations.

Use Value: Reduces footprint by >50% vs. discrete equivalents while improving current accuracy to ±15%.

Use Scenario: Driving multiple indicator LEDs in DIN-rail mounted PLC I/O modules operating at 70 °C ambient.

IC Role / Device Role / Timing Role: Thermally robust current source with 150 °C T_j rating and defined derating curve.

Use Value: Enables reliable long-term operation without thermal shutdown or current drift beyond spec limits.

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 NSI45020AT1G	20 mA fixed current; SOD-123 package; higher V_F drop (1.8 V min); no AEC-Q101 qualification	Targeted at commercial lighting; lacks automotive qualification and thermal performance data at 150 °C	Select when cost and footprint are prioritized over automotive compliance and high-temp reliability
ROHM SML020PTB	20 mA current; built-in thermal foldback; SC-70 package; 1.2 V headroom; AEC-Q101 qualified	Includes thermal protection; lower headroom enables use with lower-V_F LEDs; smaller SC-70 footprint	Prefer when thermal safety margin is required or when driving green/blue LEDs with <1.4 V forward drop

Compared with NSI45020AT1G and SML020PTB, the NCR402TR offers superior thermal resistance control (312 K/W with 1 cm² pad) and tighter supply sensitivity (+0.8 %/V), making it optimal for thermally constrained automotive PCBs where predictable current drift matters more than foldback protection.

Availability

NCR402TR is available at Aetrix Electronics and suitable for automotive interior lighting, dashboard backlighting, LED status indicators, and industrial control panel lighting requiring stable component supply, AEC-Q101 compliance, and SOT23-level manufacturability.

Supply support for NCR402TR 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 specializing in high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.

The NCR402TR belongs to Nexperia's Resistor-Equipped Transistor (RET) family, designed specifically to replace discrete transistor-resistor-diode networks in LED current regulation and generic constant-current source applications.

FAQ

Can the NCR402TR drive multiple LEDs in series?

Yes - the NCR402TR supports up to 16 V output voltage (VO), allowing it to drive up to five standard white LEDs (3.2 V each) in series at 20 mA. The required headroom (1.4 V) must be maintained between VSUP and VO; for example, a 12 V supply supports ≤8.6 V total LED forward voltage.

How does ambient temperature affect output current accuracy?

Ambient temperature changes cause predictable output current variation: −0.3 %/K. At 85 °C ambient, current drops ~18% from 25 °C value (e.g., from 20 mA to ~16.4 mA). This is inherent to the PNP-based reference architecture and is fully characterized in the datasheet.

Is PWM dimming supported with the NCR402TR?

Yes - PWM dimming is implemented externally by switching the VSUP pin or the IO/VO path using a separate transistor (e.g., PDTC124XU). The NCR402TR itself has no internal PWM capability but maintains regulation during ON cycles and draws only 420 µA in OFF state.

What PCB layout practices improve thermal performance?

Use ≥1 cm² copper pour connected to Pin 3 (IO/VO) as a thermal pad; avoid thermal isolation; ensure GND (Pin 1) connects to solid ground plane. With this layout, R_th(j-a) improves from 465 K/W to 312 K/W, enabling full 400 mW power dissipation at 25 °C ambient.

NCR402TR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Linear

Topology:: -

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: -

Voltage - Supply (Max):: 18V

Voltage - Output:: 16V

Current - Output / Channel:: 20mA

Frequency:: -

Dimming:: -

Applications:: -

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

NCR402TR FAQ

1.How can I place an order for NCR402TR through Aetrix?

Please submit a Request for Quotation (RFQ) for NCR402TR 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 NCR402TR reliable?

The price and inventory of NCR402TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCR402TR is usually 5 days.

3.What payment methods are accepted for NCR402TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCR402TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NCR402TR?

NCR402TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NCR402TR 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 NCR402TR?

For technical support, including NCR402TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCR402TR requirements.

6.How does Aetrix verify that NCR402TR is sourced from the original manufacturer or authorized distributors?

All NCR402TR 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 NCR402TR meets industry standards.

7.What is the process for return or replacement of NCR402TR?

All NCR402TR units undergo pre-shipment inspection (PSI). If there is an issue with NCR402TR, 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 NCR402TR part is unused and in its original packaging.

Return procedure for NCR402TR:

1.Submit a request within 90 days.

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

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