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Nexperia USA Inc. NCR320UX
- Part No.:
- NCR320UX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- LED Drivers
- Package:
- SC-74, SOT-457
- Datasheet:
-
NCR320UX.pdf
- Description:
- IC LED DRVR LIN PWM 250MA 6TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:608
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Product details
Overview
NCR320UX from Nexperia is a resistor-equipped NPN transistor LED driver with integrated diodes in SOT457 (SC-74/TSOP6) package, delivering stabilized 10 mA output without external components and up to 250 mA with REXT. It features 1.4 V low voltage overhead, ±1% current accuracy over supply variation, and AEC-Q101 qualification for automotive interior lighting and instrumentation.
For engineers reviewing the NCR320UX datasheet, NCR320UX pinout, NCR320UX application, or NCR320UX equivalent, key selection criteria include enable voltage range (0–25 V), thermal resistance (115–265 K/W depending on PCB layout), IOUT temperature coefficient (−0.27 %/K), and parallelization capability for >250 mA drive.
Technical Context
The NCR320UX integrates a precision current-regulating NPN transistor with two on-die diodes and an internal bias resistor (10 kΩ), forming a self-contained constant-current source. Its operation relies on emitter-degeneration feedback and internal voltage reference stability across VEN = 0–25 V.
No PWM input functionality is present-unlike the NCR321U variant-making it strictly an analog enable-controlled driver. Current regulation remains stable over ambient temperatures from −40 °C to +125 °C and supply variations up to ±1%/V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stabilized IOUT (no REXT) | 10 mA ±10% - provides consistent LED brightness without external tuning components |
| Max IOUT with REXT | 250 mA - achieved with 3 Ω external resistor; enables high-brightness single-LED or multi-LED string drive |
| Voltage overhead (VOUT,min) | 1.4 V - minimum headroom required between supply and LED anode; reduces thermal stress vs. linear regulators |
| Enable voltage range | 0–25 V - supports direct connection to 12 V automotive rails or logic-level control without level-shifting |
| Total power dissipation | 750 mW (4-layer PCB) - defines maximum continuous power handling under standard mounting conditions |
| Thermal resistance Rth(j-a) | 115 K/W - achievable with 4-layer FR4 PCB and 1 cm² collector pad; critical for thermal design margining |
| AEC-Q101 qualified | Yes - validated for automotive interior lighting applications including dashboard and number plate illumination |
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; device active when VEN ≥ 1.5 V (typical turn-on threshold) |
| 2 | IOUT | Current output terminal - connects to LED cathode; shares current path with pins 3 and 5 |
| 3 | IOUT | Current output terminal - paralleled internally with pins 2 and 5 to distribute thermal load and increase current capacity |
| 4 | GND | Ground reference - common return for enable circuitry and current sink path |
| 5 | IOUT | Current output terminal - third parallel output pin; improves thermal spreading and reduces localized heating |
| 6 | REXT | External resistor connection - sets regulated current via IOUT ≈ 0.95 V / REXT; open-circuit yields 10 mA default |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bias resistor | 10 kΩ - eliminates need for external base resistor; simplifies BOM and layout for 10 mA default operation |
| Triple-output-terminal design | Pins 2, 3, 5 all tied to same internal collector - lowers effective thermal resistance and enables higher sustained current |
| Low VCE(sat)-equivalent overhead | 1.4 V at 250 mA - minimizes power loss and heat generation compared to standard transistor-based drivers |
| Supply voltage tolerance | Up to 25 V - compatible with 12 V automotive systems including load-dump transients (with external clamping) |
| Temperature-stable regulation | −0.27 %/K drift - ensures <±5% IOUT variation across −40 °C to +125 °C ambient |
Applications
| Automotive Interior Lighting | Dashboard Instrumentation |
|---|---|
Use Scenario: Driving white or amber LEDs in door courtesy lights, map lights, and footwell illumination. IC Role / Device Role / Timing Role: Constant-current sink regulating LED brightness independent of battery voltage fluctuations (11–14.5 V). Use Value: Eliminates need for current-sense resistors and op-amp feedback loops, reducing component count by ≥3 parts per channel. |
Use Scenario: Powering segmented LED bar graphs and backlighting for analog/digital gauges in vehicle clusters. IC Role / Device Role / Timing Role: Precision current source ensuring uniform luminance across multiple LED segments despite varying forward voltages. Use Value: Maintains ±1% current matching between channels when paralleled, enabling consistent visual calibration without trimming. |
| Number Plate Illumination | Industrial Panel Indicators |
Use Scenario: Compliant rear license plate lighting meeting ECE R87 photometric requirements (minimum 20 cd/m²). IC Role / Device Role / Timing Role: High-reliability current regulator operating continuously at 85 °C ambient in sealed enclosures. Use Value: AEC-Q101 qualification and 150 °C max junction temperature support 10+ year field life in unventilated housings. |
Use Scenario: Status indication on DIN-rail mounted PLCs, HMIs, and power supplies where long-term stability is critical. IC Role / Device Role / Timing Role: Fixed-current LED driver immune to supply ripple and line transients common in industrial 24 V DC systems. Use Value: 1.4 V overhead allows operation down to 3.4 V supply while driving 2.0 V red LEDs - extends functional range during brownouts. |
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 |
|---|---|---|---|
| NCR321U | Digital PWM dimming support (up to 10 kHz); lower enable voltage (max 4.5 V); 1.5 kΩ internal bias resistor | Required for microcontroller-driven dimming; unsuitable for 12 V direct-enable use cases | Select NCR321U only when PWM control is needed; NCR320UX is preferred for simple on/off 12 V systems |
| NSI45020AZT1G | 20 mA fixed current; no REXT option; 2.5 V min VIN; TO-236 package (SOT-23) | Limited to low-current indicator LEDs; lacks thermal headroom and automotive qualification | Use NSI45020AZT1G only for space-constrained, non-automotive 20 mA indicators; not a functional replacement for 250 mA capability |
Compared with NCR321U, NCR320UX offers higher enable voltage tolerance and greater thermal robustness but lacks PWM dimming. Against NSI45020AZT1G, it delivers 12.5× higher current, AEC-Q101 compliance, and adjustable output-making it suitable for demanding automotive and industrial LED loads.
Availability
NCR320UX is available at Aetrix Electronics and suitable for automotive interior lighting, dashboard instrumentation, and number plate illumination requiring stable component supply, AEC-Q101 validation, and thermal resilience in compact SOT457 packaging.
Supply support for NCR320UX 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 NCR320U series belongs to Nexperia's resistor-equipped transistor (RET) product line, designed specifically for simplified, robust LED current regulation in cost-sensitive and thermally constrained automotive and industrial lighting systems.
FAQ
What is the minimum supply voltage required for 250 mA operation?
The minimum supply voltage equals the LED forward voltage plus 1.4 V overhead. For a typical 2.0 V red LED, VCC,min = 3.4 V. At 250 mA, power dissipation reaches 350 mW (1.4 V × 0.25 A), requiring adequate PCB copper area to maintain Tj < 125 °C.
Can multiple NCR320UX devices be paralleled safely?
Yes-NCR320UX supports parallel operation with matched REXT values. Pins 2, 3, and 5 are internally connected, enabling natural current sharing. Thermal derating must be applied: total power dissipation scales linearly, but junction temperature rise depends on combined thermal resistance of the PCB layout.
Does NCR320UX require a heatsink for 250 mA continuous operation?
No dedicated heatsink is required. With a 4-layer FR4 PCB and 1 cm² copper pour under the collector pads (pins 2/3/5), Rth(j-a) = 115 K/W limits junction temperature rise to ~86 K at 750 mW, keeping Tj within 150 °C limit at 65 °C ambient. Standard reflow land patterns per Figure 28 are sufficient.
How does output current accuracy change with supply voltage variation?
Output current varies by ±1% per volt of supply change (ΔIOUT/IOUT × ΔVCC). At 12 V supply, a ±0.5 V fluctuation causes ≤0.5% current shift-significantly tighter than discrete transistor solutions without emitter degeneration, enabling stable brightness across battery state-of-charge ranges.
NCR320UX 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:
- Constant Current
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- 16V
- Voltage - Output:
- 16V
- Current - Output / Channel:
- 250mA
- 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
NCR320UX FAQ
1.How can I place an order for NCR320UX through Aetrix?
Please submit a Request for Quotation (RFQ) for NCR320UX 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 NCR320UX reliable?
The price and inventory of NCR320UX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCR320UX is usually 5 days.
3.What payment methods are accepted for NCR320UX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCR320UX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCR320UX?
NCR320UX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCR320UX 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 NCR320UX?
For technical support, including NCR320UX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCR320UX requirements.
6.How does Aetrix verify that NCR320UX is sourced from the original manufacturer or authorized distributors?
All NCR320UX 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 NCR320UX meets industry standards.
7.What is the process for return or replacement of NCR320UX?
All NCR320UX units undergo pre-shipment inspection (PSI). If there is an issue with NCR320UX, 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 NCR320UX part is unused and in its original packaging.
Return procedure for NCR320UX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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