The Texas Instruments LM317EMP/NOPB is a 1.5 A adjustable positive linear regulator in a space-saving SOT-223 package. Using two external resistors it produces any output from 1.25 V to 37 V with a 40 V maximum input-output differential. Its 0.1% typical load regulation and 80 dB ripple rejection deliver a clean, stable rail, while internal current limiting and thermal shutdown protect the device across a 0°C to 125°C range.
Key Specifications
| Manufacturer | Texas Instruments |
| Exact Manufacturer Part Number | LM317EMP/NOPB |
| Product Category | Power Management – Voltage Regulators |
| Series / Family | LM317 |
| Package / Case | SOT-223 (DCY), 4-pin |
| Mounting Type | Surface Mount |
| Operating Temperature | 0°C to 125°C |
| Power Supply | 1.25 V to 37 V adjustable output; 40 V max input-output differential |
| Output Voltage Range | 1.25 V to 37 V (adjustable) |
| Output Current | 1.5 A |
| Line Regulation | 0.01 %/V typ |
| Load Regulation | 0.1 % typ |
| Ripple Rejection | 80 dB typ |
| Input-Output Differential | Up to 40 V |
| Operating Temperature | 0°C to 125°C |
| Lifecycle Status | Active |
| Official Documentation | View official documentation |
Key Features
- Adjustable output from 1.25 V to 37 V with two external resistors
- 1.5 A output current capability
- 0.1% typical load regulation
- 80 dB typical ripple rejection
- Internal current limiting and thermal shutdown
- Compact SOT-223 surface-mount package
Applications
- Adjustable bench and laboratory supplies
- On-board point-of-load regulation
- Battery chargers
- Constant-current LED drivers
- Post-regulation
Sourcing
Availability, lead time, date code and commercial terms are subject to confirmation at the time of quotation.
Quality
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FAQ
How does the LM317EMP/NOPB differ from the LM317S/NOPB?
The EMP is the SOT-223 surface-mount version, while the S is the TO-263 (DDPAK) surface-mount version; both are 1.5 A adjustable regulators but differ in package footprint and thermal dissipation.
What is the minimum output voltage of the LM317EMP/NOPB?
The output is adjustable down to the 1.25 V internal reference voltage using a two-resistor divider.
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