The STMicroelectronics L4931CZ33-AP is a single-output, fixed 3.3 V positive low-dropout linear regulator rated for 250 mA continuous output. It comes in a through-hole TO-92-3 package with formed leads.
STMicroelectronics L4931CZ33-AP 3.3V LDO Regulator, 250mA
MPNL4931CZ33-AP
End of Life
STMicroelectronics L4931CZ33-AP, fixed 3.3V positive LDO regulator, 250mA output, 0.8V dropout max, -40°C to 125°C, TO-92-3 through-hole package.
$0.98Ref. price · indicative, final on quote
PackagingTO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Output type | Fixed |
| Mounting | Through Hole |
| Voltage - input | 20V |
| Voltage dropout | 0.8V @ 250mA |
| Voltage - output (Min (Fixed)) | 3.3V |
| Output current | 250mA |
| Current - supply | 6 mA |
| Current - quiescent | 1 mA |
| Operating temperature | -40°C ~ 125°C |
| PSRR | 73dB ~ 55dB (120Hz ~ 10kHz) |
| Package | Tape & Box (TB); Cut Tape (CT) |
| Case | TO-226-3, TO-92-3 (TO-226AA) Formed Leads |
| Protection features | Over Current, Over Temperature |
| Number of regulators | 1 |
| Output configuration | Positive |
Product details
Frequently asked questions
Is L4931CZ33-AP obsolete or active?
It is active — current lifecycle stage, no discontinuation notice. ROHS3 compliant. No LTB risk for new designs.
L4931CZ33-AP vs L4931CZ33 — what is the difference?
The -AP suffix indicates Tape & Box (TB) or Cut Tape (CT) packaging for automated handling, versus the standard bulk tube of the base L4931CZ33. The silicon and electrical specs are identical.
Is L4931CZ33-AP pin compatible with LM78L33?
Both are 3-terminal TO-92 regulators with the same pinout (input, ground, output), so they are physically interchangeable on the same footprint. However, the LM78L33 has a higher typical dropout (around 1.7 V) and lower PSRR — verify the input headroom and ripple rejection requirements before substituting.