Negative rail workhorse — now obsolete
The Texas Instruments LM337KTPR is a negative adjustable voltage regulator delivering up to 1.5 A output current with an output range from -1.2 V down to -37 V, making it a standard choice for generating a clean negative rail in bipolar supply designs. Its 77 dB PSRR at 120 Hz provides meaningful ripple rejection on the negative rail, which matters for analog front-ends and audio circuits where supply noise couples into the signal path.
1.5 A output in a DPAK footprint
Built-in over-temperature and short-circuit protection allow the part to survive a momentary output short without external crowbar circuitry.
Sourcing an obsolete negative regulator
No official successor is listed on the record; for new designs, consider the LM337 family in an active package variant or a pin-compatible negative regulator from the same functional class. Current availability is limited to independent-distribution inventory and surplus stock.