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onsemi NCV317BD2TR4
- Part No.:
- NCV317BD2TR4
- Manufacturer:
- onsemi
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
NCV317BD2TR4.pdf
- Description:
- IC REG LIN POS ADJ 1.5A D2PAK-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
NCV317BD2TR4 from onsemi is an automotive-grade, adjustable 3-terminal positive linear voltage regulator delivering up to 1.5 A output current with 1.2 V to 37 V programmable output range. It integrates internal current limiting, thermal shutdown, and safe-area compensation, and is qualified to AEC-Q100 for use in engine control units, body electronics, and ADAS power supplies.
For engineers reviewing the NCV317BD2TR4 datasheet, pinout, applications, or equivalent options, key selection criteria include its −55°C to +150°C operating junction temperature, D2PAK-3 surface-mount package, 1.25 V reference voltage tolerance, dropout voltage behavior under load, and ripple rejection performance with/without CAdj.
Technical Context
The NCV317BD2TR4 operates as a floating regulator maintaining a precise 1.25 V nominal reference between output and adjustment terminals. Its feedback loop uses external resistors R1 and R2 to set output voltage per VOUT = 1.25 V × (1 + R2/R1) + IAdj × R2, where IAdj is controlled to ≤100 µA and exhibits <5.0 µA variation across line/load conditions.
It employs monolithic bipolar construction with 29 active transistors and features thermal regulation of 0.03–0.07 %VOUT/W, junction-to-case thermal resistance of 5.0 °C/W, and stable operation without output capacitance-though 1.0 µF tantalum improves transient response. The device supports floating configurations enabling high-voltage applications beyond ground-referenced limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 1.5 A continuous; enables single-regulator supply for microcontrollers, sensors, and actuators in automotive ECUs. |
| Output Voltage Range | 1.2 V to 37 V adjustable; supports diverse rail requirements including 3.3 V, 5 V, 12 V, and 24 V systems without stock proliferation. |
| Reference Voltage | 1.25 V (typ), ±0.05 V tolerance; sets baseline accuracy for output programming and determines minimum resolvable voltage step with R1 = 240 Ω. |
| Line Regulation | 0.01–0.07 %/V; ensures <0.7 mV change per volt input variation at 10 V output-critical for battery-input stability in start-stop systems. |
| Load Regulation | ≤0.5 %VOUT or ≤25 mV; maintains tight output control across 10 mA–1.5 A loads, essential for consistent ADC reference or analog sensor biasing. |
| Ripple Rejection | 65–80 dB at 120 Hz; suppresses alternator ripple and switching noise when CAdj = 10 µF is used-key for noise-sensitive camera or radar modules. |
| Junction Temp Range | −55°C to +150°C; validated for under-hood placement and meets AEC-Q100 Grade 1 requirements for automotive reliability. |
Pinout & Package
D2PAK-3 (Case 936) surface-mount package with heatsink surface electrically connected to Pin 2 (VOUT). Requires PCB copper area for thermal management per Figure 21; maximum power dissipation depends on trace length and copper weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adjust) | Reference node input | Sinks ≤100 µA; connects to voltage divider midpoint to program output; bypassing to ground with 10 µF improves ripple rejection. |
| 2 (VOUT) | Regulated output terminal | Delivers load current; also serves as thermal path via heatsink surface; must be routed with low-impedance trace for stability. |
| 3 (VIN) | Unregulated input supply | Accepts 2.5 V to 40 V differential above VOUT; requires 0.1 µF ceramic input capacitor if located >2 inches from bulk filter. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 qualified and PPAP capable-enables direct use in production automotive programs without requalification. |
| Thermal protection | Internal thermal shutdown triggers at ~180°C junction temperature, preventing catastrophic failure during overload or poor heatsinking. |
| Safe-area compensation | Prevents second breakdown in the pass transistor under high VIN–VOUT and high-current conditions-eliminates need for external SOA protection. |
| Low IAdj drift | IAdj changes <5 µA over full line/load range, minimizing error in VOUT equation and enabling high-accuracy programmable supplies. |
| Pb-free & RoHS | Halogen-free/BFR-free, lead-free termination-complies with global automotive environmental standards and reflow profiles. |
Applications
| Engine Control Unit (ECU) Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Provides stable 5 V rail for MCU, CAN transceiver, and injector drivers in gasoline/diesel engine control units exposed to wide temperature and battery voltage swings. IC Role / Device Role / Timing Role: Primary local voltage regulator converting 7–16 V battery input to precision 5 V output; handles load transients during fuel injection pulses. Use Value: Thermal shutdown and safe-area compensation prevent field failures during cranking (low VBAT) or hot soak (high TJ); 1.5 A rating eliminates need for parallel regulators. | Use Scenario: Supplies clean 3.3 V to image sensor, ISP, and serializer in forward-facing camera modules mounted near windshield. IC Role / Device Role / Timing Role: Post-regulator after DC-DC converter; filters switching noise and provides low-noise bias for analog pixel circuits and PLLs. Use Value: 80 dB ripple rejection with CAdj suppresses 120 Hz alternator ripple and 100–500 kHz DC-DC switching artifacts-reducing image noise and timing jitter. |
| Body Control Module (BCM) Sub-regulator | Electric Power Steering (EPS) Sensor Bias |
Use Scenario: Generates 12 V auxiliary rail from 24 V truck/bus battery for lighting control, door lock actuators, and LIN transceivers. IC Role / Device Role / Timing Role: Adjustable high-VOUT regulator supporting legacy 12 V loads in 24 V architectures; configured with R1 = 240 Ω, R2 = 2.15 kΩ. Use Value: Floating operation allows direct 24 V input without level-shifting; 37 V max VOUT headroom accommodates load-dump transients up to ISO 7637-2 Pulse 5a. | Use Scenario: Powers torque and position sensors in EPS motor control units requiring ultra-stable bias under vibration and EMI. IC Role / Device Role / Timing Role: Precision current source mode (R1 = open, R2 from Adjust to ground) delivers 5–100 mA constant current to resistive sensors. Use Value: IAdj stability <5 µA ensures current accuracy better than ±1%, critical for torque-sensing bridge excitation and offset calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable positive linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317BD2TR4G | Same pinout and electrical specs but rated for −40°C to +125°C; lacks AEC-Q100 qualification and automotive PPAP support. | Not suitable for under-hood automotive use; acceptable for industrial or commercial embedded systems with less stringent reliability requirements. | Select only if automotive qualification is unnecessary and cost sensitivity outweighs long-term reliability validation burden. |
| TLV1117-33CDR | Fixed 3.3 V output, 800 mA max, SOT-223 package; lower dropout (1.2 V), higher PSRR (70 dB), but non-adjustable and lower current. | Applicable only for fixed-rail, low-power applications; cannot replace NCV317BD2TR4 in programmable or >1 A designs. | Choose only for space-constrained, fixed-voltage, sub-1 A applications where simplicity and low dropout outweigh adjustability and current capability. |
Compared with LM317BD2TR4G, the NCV317BD2TR4 adds automotive qualification and extended temperature range at identical cost and footprint; compared with TLV1117-33CDR, it trades fixed-output simplicity for full adjustability, higher current, and ruggedized thermal design-making it irreplaceable in programmable multi-rail automotive subsystems.
Availability
NCV317BD2TR4 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for NCV317BD2TR4 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The NCV317BD2TR4 belongs to onsemi's automotive-qualified linear regulator product line, designed specifically to meet AEC-Q100 requirements and deliver robust, thermally resilient voltage regulation in harsh vehicular environments.
FAQ
What is the minimum load current required for regulation in the NCV317BD2TR4?
The NCV317BD2TR4 requires a minimum load current of 3.5 mA (typical) to 10 mA (max) to maintain regulation, especially when the input-output differential exceeds 40 V. This is due to internal quiescent current being returned to the output pin; insufficient load causes output voltage to rise uncontrollably. Designers must ensure this current is drawn-either by the load or via a bleed resistor-to guarantee stable operation across all conditions.
How does the NCV317BD2TR4 achieve thermal shutdown protection?
The NCV317BD2TR4 incorporates an integrated thermal shutdown circuit that disables the pass transistor when the junction temperature reaches approximately 180°C. This threshold is not production-tested but is designed into the die layout and process. Once triggered, the device remains off until junction temperature falls below the hysteresis threshold (~150°C), preventing thermal runaway during sustained overload or inadequate heatsinking-critical for automotive under-hood reliability.
Can the NCV317BD2TR4 be used as a precision current regulator?
Yes, the NCV317BD2TR4 can function as a precision current regulator by connecting a single resistor RSET between the Adjust and output terminals. With VREF = 1.25 V fixed, output current IOUT ≈ 1.25 V / RSET, independent of input voltage. For example, RSET = 125 Ω yields 10 mA. Accuracy depends on VREF tolerance (±4%) and IAdj contribution (<0.1% error at 10 mA), making it suitable for sensor excitation and LED biasing in automotive applications.
What is the purpose of the CAdj capacitor in NCV317BD2TR4 circuits?
The CAdj capacitor (typically 10 µF) connects between the Adjust pin and ground to improve ripple rejection-especially at 120 Hz-by shunting AC components away from the reference node. Without CAdj, ripple rejection is ~65 dB; with it, performance improves to ~80 dB. However, CAdj introduces a potential discharge path during output short-circuit events, requiring protection diode D2 (1N4001) from Adjust to output to prevent damage to the NCV317BD2TR4.
Does the NCV317BD2TR4 require an output capacitor for stability?
No, the NCV317BD2TR4 is internally compensated and stable without an output capacitor. However, adding a 1.0 µF tantalum or 25 µF aluminum electrolytic capacitor (CO) at the output significantly improves transient response and damps potential ringing caused by certain external capacitive loads. This is recommended for automotive applications with fast-switching loads like solenoids or motor drivers, where output voltage droop or overshoot must be minimized.
NCV317BD2TR4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- Voltage Dropout (Max):
- -
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK-3
NCV317BD2TR4 FAQ
1.How can I place an order for NCV317BD2TR4 through Aetrix?
Please submit a Request for Quotation (RFQ) for NCV317BD2TR4 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 NCV317BD2TR4 reliable?
The price and inventory of NCV317BD2TR4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCV317BD2TR4 is usually 5 days.
3.What payment methods are accepted for NCV317BD2TR4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCV317BD2TR4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCV317BD2TR4?
NCV317BD2TR4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCV317BD2TR4 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 NCV317BD2TR4?
For technical support, including NCV317BD2TR4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCV317BD2TR4 requirements.
6.How does Aetrix verify that NCV317BD2TR4 is sourced from the original manufacturer or authorized distributors?
All NCV317BD2TR4 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 NCV317BD2TR4 meets industry standards.
7.What is the process for return or replacement of NCV317BD2TR4?
All NCV317BD2TR4 units undergo pre-shipment inspection (PSI). If there is an issue with NCV317BD2TR4, 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 NCV317BD2TR4 part is unused and in its original packaging.
Return procedure for NCV317BD2TR4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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