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LM2931M-5.0-NOPB

LM2931M-5.0/NOPB 5V Fixed LDO, 100 mA, 0.3 V Dropout, Active

MPNLM2931M-5.0/NOPB
Active

Texas Instruments LM2931M-5.0/NOPB, 5V fixed-output LDO regulator, 100 mA output, 0.3 V dropout at 100 mA, 55 dB PSRR at 120 Hz, SOIC-8, -40°C to 85°C.

$1.1600Ref. price · indicative, final on quote
Texas Instruments LM2931M-5.0/NOPB datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM2931M-5.0/NOPB specifications
ParameterValue
Output typeFixed
MountingSurface Mount
Voltage - input26V
Voltage dropout0.3V @ 100mA
Voltage - output (Min (Fixed))5V
Output current100mA
Current - supply15 mA
Current - quiescent1 mA
Operating temperature-40°C~85°C
PSRR55dB (120Hz)
PackageTube
Case8-SOIC (0.154\", 3.90mm Width)
Protection featuresOver Temperature, Reverse Polarity, Short Circuit
Number of regulators1
Output configurationPositive

Product details

No need to stockpile or hunt for a second source yet.

100 mA fixed 5 V rail — dropout and PSRR matter

This is a single-output, positive fixed 5 V LDO rated for 100 mA continuous. The 0.3 V dropout at full load means you need at least 5.3 V on the input to hold regulation — fine for a 6 V or 9 V battery rail, but tight off a 5 V switcher post-filter. PSRR is 55 dB at 120 Hz — that is decent for an LDO of this vintage and enough to clean up 100/120 Hz ripple from a rectified mains supply feeding an analog front-end or a sensor bias rail.

Protection that saves a field swap

Built-in over-temperature shutdown, reverse polarity protection, and short-circuit current limiting. Reverse polarity is the one that earns its keep in a field repair — a swapped battery lead or a mis-wired harness won't kill the regulator or the downstream load.

Frequently asked questions

Is the LM2931M-5.0/NOPB a direct replacement for the LM2931M-5.0 (non-NOPB)?

The NOPB suffix indicates RoHS-compliant, lead-free construction. Electrically and pin-for-pin it is the same regulator — the non-NOPB version was tin/lead. If your assembly line is RoHS-mandated, the NOPB is the drop-in; if you need the older solder finish for a legacy reflow profile, source the non-NOPB variant.

What protection features does the LM2931M-5.0/NOPB include?

The reverse polarity block is the standout — it lets the regulator survive a reversed input without external diode clamping, which simplifies the BOM for battery-powered or field-wired equipment.