5 V fixed LDO with 75 dB PSRR — the analog-rail regulator
The onsemi LM2931AD50 is a 5 V fixed-output low-dropout regulator rated for 100 mA continuous output. The 0.6 V max dropout at full load means the input can sit as low as 5.6 V and still hold regulation, useful in 6 V or 9 V battery-powered designs where every millivolt of headroom costs runtime.
Industrial temperature range and protection set
Rated for -40 to 125 °C junction temperature, the LM2931AD50 can live under the hood or on an outdoor industrial control board without derating the output current. On-chip current limit and thermal shutdown handle a sustained overload or a shorted output — the die pulls back before the plastic package reaches its glass-transition point. Quiescent current is 1 mA typical, rising to 30 mA max under fault; the 1 mA Iq matters for always-on battery circuits where every microamp is budgeted.
Obsolete — sourcing through independent distribution
The LM2931AD50 carries an obsolete lifecycle status. No official successor is listed on the record. No stock-holding claim; each lot is verified before shipment.
8-SOIC footprint — reflow and placement notes
The part ships in an 8-SOIC package (0.154-inch body width, 3.90 mm) on tube. The standard SOIC-8 footprint is a mature, low-risk profile for pick-and-place — no exposed pad, no fine-pitch concerns.