Item specifics
Description
The NCV317BD2TR4G is an automotive-grade adjustable positive linear voltage regulator from onsemi's NCV317 series, housed in a TO-263-2 (D2PAK) surface-mount package. It delivers output current in excess of 1.5A with an adjustable output voltage programmable from 1.2V to 37V using two external resistors. Operating from a maximum input voltage of 40V with a typical dropout of only 2.25V, the device integrates internal current limiting, thermal shutdown, and safe-area compensation, featuring an ultra-high PSRR of 80dB at 120Hz. The NCV317BD2TR4G is AEC-Q100 qualified with an operating junction temperature range of -55°C to +150°C, specifically designed for automotive and other applications requiring unique site and control change requirements. As a pin-compatible LM317 replacement, it is widely used in automotive infotainment, instrument clusters, body control modules, industrial control, and power management applications.
| Model | NCV317BD2TR4G |
| Series | NCV317B |
| Device Type | Adjustable Output Positive Linear Voltage Regulator (LDO) |
| Output Polarity | Positive |
| Output Voltage Range | 1.2V ~ 37V (Adjustable) |
| Output Current | 1.5 A (Max) |
| Input Voltage (Max) | 40 V |
| PSRR | 65dB @ 120Hz |
| Quiescent Current (Iq) | 10 mA |
| Output Noise | 0.003% Vout |
| Reference Voltage | 1.3 V |
| Number of Outputs | 1 |
| Output Type | Adjustable |
| Protections | Internal Thermal Overload Protection, Internal Short Circuit Current Limiting, Output Transistor Safe-Area Compensation |
| Operating TJ | -55℃ ~ +150℃ |
| Package | TO-263-2 (D²PAK / TO-263AB) |
| Dimensions | 10.24 × 9.35 × 4.57 mm |
| Mounting Type | Surface Mount |
| Grade | Automotive |
Typical Applications
Automotive electronics voltage regulation
Industrial control equipment adjustable power supply
Local and on-card regulation
Programmable output regulator
Precision current regulator (with a fixed resistor between adjustment and output)
Floating operation for high voltage applications
Battery chargers
Consumer electronics power supplies
FAQ
Q: How is the output voltage set?
A: The device sets output voltage via two external resistors from 1.2V to 37V. The formula is: VOUT = 1.25 × (1 + R2/R1), with R1 typically selected as 240Ω to set approximately 5mA through the ADJ pin. The device can also be used as a programmable output regulator, or as a precision current regulator by connecting a fixed resistor between the adjustment and output.
Q: What is the PSRR?
A: 65dB at 120Hz, effectively suppressing input supply ripple effects on the output voltage.
Q: What protection features are integrated?
A: Internal thermal overload protection, internal short circuit current limiting (constant over temperature), and output transistor safe-area compensation, making it essentially blow-out proof.
Q: What is the difference between NCV317BD2TR4G and LM317BD2TR4G?
A: Both share essentially identical core parameters, with the primary difference being temperature grade and qualification: NCV317BD2TR4G is automotive-grade (AEC-Q100) with -55℃ to +150℃ junction temperature range; LM317BD2TR4G is industrial-grade with -40℃ to +125℃ range. Select based on application temperature and qualification requirements.
Q: What should be noted for thermal design?
A: The NCV317B generates significant heat at higher output currents or larger input-output voltage differentials. Power dissipation is calculated as P = (VIN - VOUT) × IOUT. The TO-263-2 (D²PAK) package tab is connected to pin 2 (VOUT) and should be soldered to sufficient PCB copper area for enhanced heat dissipation. A large ground plane is recommended as a heatsink.
Q: Is this device suitable for automotive applications?
A: Yes. The NCV317BD2TR4G is AEC-Q100 qualified with an operating junction temperature range of -55℃ to +150℃, suitable for automotive electronics and other applications requiring unique site and control change requirements.
Why Choose QIXINWEI
Years of experience in the electronics industry. Trusted by global customers.
Massive In-Stock Inventory – Ready to ship promptly
BOM Matching Service – One-stop solution, save time
PCBA Customization – Professional engineering team creates tailor-made solutions based on your needs
Cost-Effective & Efficient – Better channel, better cost
A dedicated team makes your procurement smoother.
Contact us for BOM quotes or PCBA inquiries