Texas Instruments LM317AH
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $14.80 | $14.80 |
| 15+ | $14.33 | $214.95 |
| 25+ | $14.02 | $350.50 |
| 50+ | $13.24 | $662.00 |
| 100+ | $11.69 | $1,169.00 |
| N+ | $2.34 | Price Inquiry |
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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| 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) | 10 mA |
| Current - Supply (Max) | - |
| PSRR | 80dB ~ 65dB (120Hz) |
| Control Features | - |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | -40°C ~ 125°C |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | TO-205AD, TO-39-3 Metal Can |
| Supplier Device Package | TO-3 |
| ROHS |  |
The LM317AH from Texas Instruments is a versatile adjustable linear regulator delivering 1.5A with output voltage from 1.25V to 37V. Its TO-3 package ensures robust thermal performance for demanding industrial and audio applications. With 80dB PSRR at 120Hz and 10 mA quiescent current, it offers reliable, low-noise regulation. This classic component remains a preferred choice for adjustable power supplies and precision circuits.
- Adjustable Output (1.25V-37V): Provides design flexibility for multiple voltage rails with just two external resistors.
- High Current (1.5A): Suitable for powering moderate loads like motors, heaters, or multiple ICs.
- TO-3 Package: Excellent heat dissipation for high-power applications, ensuring long-term reliability.
- High PSRR (80dB): Minimizes ripple from rectified AC, ideal for audio and precision analog circuits.
Adjustable Bench Power Supplies
The 1.25V to 37V range and 1.5A capability make it a classic choice for hobbyist and lab variable supplies, offering reliable regulation with external resistor programming.
Audio Amplifier Bias Supplies
With 80dB PSRR at 120Hz, it provides clean DC rails for op-amp stages, reducing hum in high-fidelity audio preamplifiers.
Battery Charger Circuits
Its adjustable output allows precise voltage setting for charging lead-acid or lithium batteries, with current limiting via external resistors.
Industrial Control Systems
The TO-3 package handles high power dissipation, making it suitable for 24V industrial control loops requiring stable 5V or 12V rails.
Test and Measurement Equipment
Low noise and good line regulation support precision voltage references in multimeters and calibration tools.
HVAC Controllers
Wide input range tolerates voltage sags in building automation, providing stable logic supply from 24VAC rectified rails.
- Q: What is the output voltage range?
- A: The LM317AH 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 range?
- A: The input voltage can be up to 37V (with output set to 1.25V).
- Q: What is the quiescent current?
- A: The quiescent current is typically 10 mA.
- Q: What package is available?
- A: It is available in the TO-3 metal can package.
- Q: What is the PSRR?
- A: PSRR is 80dB at 120Hz, reducing to 65dB at higher frequencies.
LM317AH.pdf
- Q: What is the output voltage range?
- A: The LM317AH 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 range?
- A: The input voltage can be up to 37V (with output set to 1.25V).
- Q: What is the quiescent current?
- A: The quiescent current is typically 10 mA.
- Q: What package is available?
- A: It is available in the TO-3 metal can package.
- Q: What is the PSRR?
- A: PSRR is 80dB at 120Hz, reducing to 65dB at higher frequencies.
