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Nexperia USA Inc. NCR420ZX
- Part No.:
- NCR420ZX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- LED Drivers
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
NCR420ZX.pdf
- Description:
- IC LED DRVR LIN PWM 150MA SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:10,792
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Product details
Overview
NCR420ZX from Nexperia is a resistor-equipped NPN transistor LED driver with integrated diodes in SOT223 (SC-73) package, delivering stabilized 10 mA output current without external components and up to 150 mA with REXT, featuring 1.4 V voltage overhead, 40 V max supply, and AEC-Q101 qualification for automotive interior lighting.
For engineers reviewing the NCR420ZX datasheet, NCR420ZX pinout, NCR420ZX application, or NCR420ZX equivalent, this device serves as a compact, thermally robust constant-current source for LED biasing where supply voltage variation tolerance, minimal board space, and automotive-grade reliability are critical selection criteria.
Technical Context
The NCR420ZX implements a monolithic resistor-equipped NPN transistor architecture with two on-die diodes, enabling self-biased constant-current regulation independent of VCC fluctuations. Its internal 95 Ω ±5 % bias resistor sets nominal IOUT = 10 mA at VEN = 24 V and VOUT = 1.4 V.
Current stabilization relies on emitter-degeneration via internal resistance and thermal feedback, achieving ±1 %/V supply sensitivity and –0.27 %/K temperature drift. It operates with no enable logic-VEN functions as direct supply input-and lacks PWM capability (distinguishing it from NCR421Z).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stabilized IOUT (no REXT) | 10 mA typical; enables plug-and-play LED biasing without external tuning components |
| Max IOUT with REXT | 150 mA; achieved using external resistor (e.g., 5.1 Ω at VEN = 24 V), doubling usable drive range |
| Voltage overhead (VOUT,min) | 1.4 V; allows operation with low-VF LEDs (e.g., red/orange) while maintaining regulation margin |
| Max supply voltage (VEN) | 40 V; supports 24 V automotive systems with transient headroom and industrial 36 V rails |
| Power dissipation (PTOT) | 1250 mW on 4-layer FR4 PCB; enables high-current operation without heatsink in space-constrained layouts |
| Thermal resistance Rth(j-a) | 70 K/W (4-layer PCB); ensures junction temperature stays ≤125 °C at 150 mA with 25 °C ambient |
| AEC-Q101 qualified | Validated for automotive use including dashboard, instrumentation, and number plate lighting per stress test requirements |
Pinout & Package
SOT223 (SC-73) plastic surface-mounted package with increased heatsink; 4 leads, standard footprint per Figure 29, JEITA code SC-73.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VEN | Enable voltage / supply input | Direct DC supply connection (up to 40 V); no logic-level enable-device active whenever powered |
| 2 - REXT | External current-setting resistor node | Connects to one end of external resistor; adjusts IOUT from 10 mA to 150 mA linearly with REXT value |
| 3 - GND | Ground reference | Common return path for enable current, output current, and internal bias network |
| 4 - IOUT | Constant-current output | Sinks regulated current to LED anode or load; collector terminal of internal NPN transistor |
Key Features
| Feature | Design Value |
|---|---|
| No external resistor required | Delivers precise 10 mA output by default-reduces BOM count and layout complexity for basic LED indicators |
| Adjustable 10–150 mA range | Single external resistor scales output linearly, supporting diverse LED string configurations without redesign |
| Low 1.4 V overhead | Enables use with low-forward-voltage LEDs (e.g., AlInGaP red) while preserving regulation across full current range |
| High supply rejection (±1 %/V) | Maintains stable brightness during battery voltage sag or ripple in automotive 12/24 V systems |
| AEC-Q101 qualification | Validated for automotive ambient temperature (–40 °C to +150 °C) and mechanical stress, enabling drop-in use in production vehicles |
Applications
| Automotive Interior Lighting | Dashboard Backlighting |
|---|---|
|
Use Scenario: Illuminating push-button switches and control knobs in vehicle cabins under varying battery voltage (9–16 V). IC Role / Device Role / Timing Role: Constant-current sink regulating LED brightness independently of supply fluctuations. Use Value: Eliminates need for voltage regulators or op-amp current sources-reducing cost and PCB area while meeting OEM luminance consistency specs. |
Use Scenario: Driving edge-lit CCFL or LED arrays behind analog instrument clusters with tight thermal constraints. IC Role / Device Role / Timing Role: Primary current source for uniform backlight intensity across wide temperature range (–40 °C to +85 °C). Use Value: Delivers <±3% current stability over temperature and supply, ensuring consistent display contrast without microcontroller compensation. |
| Number Plate Light Module | Commercial Vehicle Marker Lights |
|
Use Scenario: Powering white LED arrays in rear license plate illumination compliant with ECE R87 photometric requirements. IC Role / Device Role / Timing Role: High-reliability current regulator operating directly from 24 V truck/bus battery with load dump immunity. Use Value: Withstands 40 V transients and dissipates 1.25 W continuously-enabling single-device solution without derating or parallel staging. |
Use Scenario: Driving multi-LED marker lights on trailers and heavy-duty equipment exposed to vibration and wide ambient swings. IC Role / Device Role / Timing Role: AEC-Q101-qualified current sink providing fault-tolerant LED drive in harsh environments. Use Value: Qualified for 150 °C junction operation and rated for >1000 thermal cycles-ensuring longevity in unventilated enclosures. |
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 REXT adjustment; 45 V max VIN; 1.3 V overhead | Limited to fixed-current designs; better for ultra-low-power indicator LEDs only | Select when exact 20 mA is required and board space is extremely constrained-no resistor needed but no flexibility |
| ROHM BD15GA5WEFJ-E2 | Adjustable 5–150 mA; 40 V max; 1.2 V overhead; built-in thermal shutdown | Includes overtemperature protection; requires 1.8 V min VIN for regulation | Choose when thermal safety margin is mandatory and system can support additional enable control logic |
Compared with NSI45020AZT1G and BD15GA5WEFJ-E2, the NCR420ZX offers unique combination of factory-trimmed 10 mA baseline, full 150 mA adjustability via one resistor, and AEC-Q101 validation without added protection circuitry-making it optimal for cost-sensitive, thermally demanding automotive LED loads where simplicity and qualification are primary drivers.
Availability
NCR420ZX is available at Aetrix Electronics and suitable for automotive interior lighting, dashboard backlighting, number plate illumination, and commercial vehicle marker lights requiring stable component supply across extended temperature and voltage ranges.
Supply support for NCR420ZX 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 solutions for automotive, industrial, and consumer markets.
The NCR420ZX belongs to Nexperia's resistor-equipped transistor (RET) LED driver product line, engineered specifically for robust, low-component-count constant-current LED biasing in automotive lighting systems where qualification, thermal resilience, and supply variation tolerance are non-negotiable.
FAQ
What is the minimum supply voltage required for regulation?
The NCR420ZX requires VEN ≥ VLED + 1.4 V to maintain constant current. For a typical red LED with VF = 2.0 V, minimum VEN is 3.4 V. Regulation degrades below this threshold, causing current to fall nonlinearly with supply reduction.
Can NCR420ZX be used in parallel for higher current?
Yes-NCR420ZX supports parallel operation with matched REXT values. When two units share identical external resistors and thermal environment, output current splits within ±5 %, doubling total drive capacity to 300 mA while distributing power dissipation.
Does NCR420ZX support PWM dimming?
No. Unlike the NCR421Z variant, NCR420ZX has no digital enable input-it is always active when powered. PWM dimming requires external switching (e.g., MOSFET in series with LED anode) or substitution with NCR421Z for direct VEN-controlled duty cycling.
What is the maximum allowable REXT value for 150 mA operation?
At VEN = 24 V and VOUT > 2 V, REXT = 5.1 Ω yields 150 mA typical. Increasing REXT reduces current; decreasing it risks exceeding 200 mA absolute maximum rating. Values below 4.7 Ω are not recommended due to thermal and SOA limitations.
NCR420ZX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- 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:
- SOT-223
NCR420ZX FAQ
1.How can I place an order for NCR420ZX through Aetrix?
Please submit a Request for Quotation (RFQ) for NCR420ZX 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 NCR420ZX reliable?
The price and inventory of NCR420ZX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCR420ZX is usually 5 days.
3.What payment methods are accepted for NCR420ZX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCR420ZX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCR420ZX?
NCR420ZX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCR420ZX 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 NCR420ZX?
For technical support, including NCR420ZX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCR420ZX requirements.
6.How does Aetrix verify that NCR420ZX is sourced from the original manufacturer or authorized distributors?
All NCR420ZX 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 NCR420ZX meets industry standards.
7.What is the process for return or replacement of NCR420ZX?
All NCR420ZX units undergo pre-shipment inspection (PSI). If there is an issue with NCR420ZX, 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 NCR420ZX part is unused and in its original packaging.
Return procedure for NCR420ZX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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