What Is the LM337? Adjustable Negative Regulator and Uses
The LM337 is an adjustable negative linear voltage regulator; the negative counterpart of the LM317. Two resistors set the output from −1.25 V to −37 V (V=−1.25×(1+R2/R1)). It is usually used with the LM317 to build a symmetric (±) supply. ⚠️ Its pin arrangement differs from the LM317 — verify the datasheet.
The LM337 is an adjustable negative linear voltage regulator. It is the negative counterpart of its positive sibling, the LM317: two resistors set the output from −1.25 V to −37 V. For the concept, see what is a voltage regulator.
What is the LM337 used for?
Producing the adjustable negative supply (e.g. −5 V, −12 V) that op-amps and analog circuits need. It is usually used with the LM317 to build a symmetric (±) supply. Output: Vout = −1.25 × (1 + R2/R1).
Terminals and pinout — DIFFERENT from the LM317
The LM337 has three terminals: ADJUST, VIN (input), VOUT (output). ⚠️ The pin arrangement is NOT the same as the LM317 (a negative regulator orders input/output differently). Always verify the pinout in the datasheet of your exact part before wiring.
Specifications
| Parameter | Value |
|---|---|
| Type | Adjustable negative linear regulator |
| Output | −1.25 V … −37 V |
| Current | ~1.5 A (with heatsink) |
| Reference | −1.25 V |
Equivalents
- LM317: the positive counterpart (together for a symmetric supply).
- LM337L: a low-current version.
- LM7905: a fixed −5 V (non-adjustable).
Find it in our catalog
Use the LM337 search.