National Semiconductor LM317H/NOPB
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $52.64 | $52.64 |
| 15+ | $12.11 | $181.65 |
| 25+ | $11.84 | $296.00 |
| 50+ | $11.19 | $559.50 |
| 100+ | $9.87 | $987.00 |
| N+ | $1.97 | Price Inquiry |
Request Quote / Inquiry
| Product attributes | Property Value |
| Manufacturer | National Semiconductor |
| Product Series | |
| Packaging | Bulk | |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 40V |
| Voltage - Output (Min/Fixed) | 1.25V |
| Voltage - Output (Max) | 37V |
| Voltage Dropout (Max) | - |
| Current - Output | 1.5A |
| Current - Quiescent (Iq) | - |
| Current - Supply (Max) | - |
| PSRR | 80dB ~ 65dB (120Hz) |
| Control Features | - |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | 0°C ~ 125°C |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | TO-205AD, TO-39-3 Metal Can |
| Supplier Device Package | TO-39-3 |
| ROHS |  |
The LM317H/NOPB from National Semiconductor is a legendary adjustable linear voltage regulator capable of delivering 1.5A with an output range from 1.25V to 37V. Housed in a durable TO-39-3 metal package, it offers excellent power supply rejection of 80dB at 120Hz, ensuring clean output for audio and precision applications. Its simplicity—requiring just two resistors to set the voltage—makes it a versatile choice for power supplies, chargers, and industrial equipment.
- Adjustable Output: 1.25V to 37V range provides maximum design flexibility.
- High Current: 1.5A output supports a wide range of loads.
- Excellent PSRR: 80dB at 120Hz ensures low ripple in audio and sensitive circuits.
- Robust TO-39 Package: Metal can construction offers superior thermal and mechanical strength.
- Proven Design: Decades of reliable use in countless applications.
Variable Bench Power Supplies
The LM317H's adjustable 1.25V to 37V output and 1.5A capability make it the industry standard for DIY and professional bench power supplies.
Audio Amplifier Power
With 80dB PSRR at 120Hz, it provides clean DC rails for audio preamplifiers and low-power amplifiers, reducing hum.
Battery Chargers
Its adjustable output allows precise voltage settings for charging lead-acid or lithium batteries with constant voltage.
LED Driver Circuits
By setting the output voltage, the LM317H can drive strings of high-power LEDs with stable current when combined with a resistor.
Industrial Sensor Supplies
The TO-39 package and 1.5A output support industrial sensors requiring adjustable 5V to 24V rails.
Laboratory Test Equipment
Its reliability and adjustability make it a staple in test benches for generating reference voltages and testing circuits.
- Q: What is the output voltage range of the LM317H/NOPB?
- A: The output voltage is adjustable from 1.25V to 37V.
- Q: What is the maximum output current?
- A: It can deliver up to 1.5A of output current.
- Q: What is the input voltage requirement?
- A: The minimum input voltage is 1.25V above the output voltage.
- Q: What is the package type?
- A: It is available in a TO-39-3 metal can package.
- Q: What is the PSRR performance?
- A: Power supply rejection ratio is 80dB at 120Hz, reducing to 65dB at higher frequencies.
- Q: Is the output adjustable?
- A: Yes, using two external resistors, the output can be set anywhere from 1.25V to 37V.
LM317H/NOPB.pdf
- Q: What is the output voltage range of the LM317H/NOPB?
- A: The output voltage is adjustable from 1.25V to 37V.
- Q: What is the maximum output current?
- A: It can deliver up to 1.5A of output current.
- Q: What is the input voltage requirement?
- A: The minimum input voltage is 1.25V above the output voltage.
- Q: What is the package type?
- A: It is available in a TO-39-3 metal can package.
- Q: What is the PSRR performance?
- A: Power supply rejection ratio is 80dB at 120Hz, reducing to 65dB at higher frequencies.
- Q: Is the output adjustable?
- A: Yes, using two external resistors, the output can be set anywhere from 1.25V to 37V.
