Buck regulator for 12 V / 24 V industrial rails — 500 mA, adjustable output
The Texas Instruments LM2671N-ADJ/NOPB is a SIMPLE SWITCHER® step-down (buck) regulator delivering up to 500 mA from a 6.5 V to 40 V input rail. Output is adjustable from 1.21 V up to 37 V.
500 mA output — sizing the load budget
The 500 mA continuous output is the hard ceiling for this regulator. It powers a handful of op-amps, a small FPGA core rail, or a relay coil supply — but not a multi-amp load.
Through-hole 8-DIP — legacy fit and rework
The 8-pin DIP (0.300" width, 7.62 mm pitch) is a through-hole package. It plugs into a standard DIP socket or solders directly into plated through-holes. This is the package for bench prototypes, low-volume production, and rework of older boards where an SMD regulator would require a layout change.
The -40°C low end covers cold-start conditions; the 125°C upper limit requires careful thermal design (heatsink or airflow) when running near full load at high ambient.
Active, RoHS3, no synchronous rectifier
It does not use synchronous rectification, so the external Schottky diode is required — factor that into the BOM count and board area. The non-synchronous topology is simpler and cheaper than a synchronous FET design, but efficiency suffers at low output voltages where the diode forward drop becomes a larger fraction of the output.