Texas Instruments LM317LCDR
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $0.34 | $0.34 |
| 15+ | $0.33 | $4.95 |
| 25+ | $0.32 | $8.00 |
| 50+ | $0.31 | $15.50 |
| 100+ | $0.27 | $27.00 |
| N+ | $0.05 | Price Inquiry |
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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | |
| Packaging | Cut Tape (CT) | Tape & Reel (TR) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 38V |
| Voltage - Output (Min/Fixed) | 1.2V |
| Voltage - Output (Max) | 32V |
| Voltage Dropout (Max) | - |
| Current - Output | 100mA |
| Current - Quiescent (Iq) | 2.5 mA |
| 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 | Surface Mount |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Supplier Device Package | 8-SOIC |
| ROHS |  |
The LM317LCDR from Texas Instruments is a versatile adjustable linear regulator delivering up to 100mA with an output range to 32V. Its low quiescent current and excellent ripple rejection make it ideal for battery-powered and precision analog circuits. The 8-SOIC package suits compact PCB layouts, while the classic three-terminal design simplifies external component selection.
- Adjustable Output Flexibility: Output voltage set with two resistors, enabling custom rails from 1.2V to 32V without changing parts.
- High Ripple Rejection: 80dB PSRR at 120Hz filters mains hum, critical for audio and instrumentation.
- Low Quiescent Current: 2.5mA idle current preserves battery life in portable devices.
- Compact SOIC-8 Package: Saves board space compared to TO-220 alternatives, ideal for dense designs.
Adjustable Power Supply for Op-Amps
Use the LM317LCDR to create a clean, adjustable rail (up to 32V) for precision analog circuits. Its 80dB PSRR at 120Hz effectively filters mains ripple, ensuring stable op-amp performance.
Battery-Powered Instrumentation
With a low quiescent current of 2.5mA, this regulator extends battery life in portable meters and sensors while providing a stable reference voltage for ADC/DAC stages.
Microcontroller Logic Supply
Derive a precise 3.3V or 5V logic rail from a higher unregulated input. The adjustable output allows fine-tuning to match specific MCU voltage tolerances, reducing noise-induced resets.
Audio Preamplifier Bias
For low-noise audio preamps, the LM317LCDR's high PSRR (80dB) minimizes hum from the main supply, delivering a quiet bias voltage for JFET or BJT input stages.
Industrial Sensor Excitation
Provide a stable excitation voltage for bridge sensors (strain gauges, RTDs). The adjustable output compensates for line losses, improving measurement accuracy over long cable runs.
Reference Voltage for Comparators
Set a precise threshold voltage for comparators in threshold-detection circuits. The 1.2V minimum input-output differential ensures reliable operation even with low input margins.
- Q: What is the output voltage range of the LM317LCDR?
- A: The LM317LCDR provides an adjustable output voltage up to 32V, set by external resistors.
- Q: What is the maximum output current?
- A: The maximum output current is 100mA, suitable for low-power applications.
- Q: What is the input voltage range?
- A: The input voltage must be at least 1.2V above the desired output voltage, with a maximum input of 32V.
- Q: What is the dropout voltage?
- A: Dropout voltage is not specified in the provided data; typically it is around 2V for this series.
- Q: What is the quiescent current?
- A: The quiescent current is 2.5 mA.
- Q: What package is available?
- A: It comes in an 8-SOIC package.
LM317LCDR.pdf
- Q: What is the output voltage range of the LM317LCDR?
- A: The LM317LCDR provides an adjustable output voltage up to 32V, set by external resistors.
- Q: What is the maximum output current?
- A: The maximum output current is 100mA, suitable for low-power applications.
- Q: What is the input voltage range?
- A: The input voltage must be at least 1.2V above the desired output voltage, with a maximum input of 32V.
- Q: What is the dropout voltage?
- A: Dropout voltage is not specified in the provided data; typically it is around 2V for this series.
- Q: What is the quiescent current?
- A: The quiescent current is 2.5 mA.
- Q: What package is available?
- A: It comes in an 8-SOIC package.
