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Best Alternatives to 78L33

Package: TO-92, SOT-89, SOP-8, SOT-23UMWPMIC - Voltage Regulators - LinearOutput Voltage: 3.3 VOutput Current: 100 mAInput Voltage (Max): 20 VDropout Voltage: 1.7 VQuiescent Current: 2 mA

The 78L33 is a classic 3.3V linear voltage regulator providing up to 100mA. While widely available, modern alternatives offer significant improvements in efficiency and size, but often require design modifications.

AI replacement insight

Electrical riskhigh

Many alternatives have lower max input voltage, posing an overvoltage risk.

Package riskhigh

Modern parts use different packages (e.g., SOT-23-5) and pinouts, requiring board redesign.

Can it be replaced directly?

No direct drop-in replacement has been identified from the candidates. All require careful review of input voltage and pinout.

Best replacement path

For new designs, select a modern LDO like the TPS7A24 series. For existing boards, finding a true pin-compatible replacement with a >=20V input rating is critical.

Main risk

The primary risk is mismatched maximum input voltage and different package pinouts. Many modern LDOs have lower input voltage ratings than the 20V of the 78L33.

Recommended alternatives

2
TPS7A2433DBVR package
TPS7A2433DBVR

Texas Instruments

Needs validationhigh risk

A modern alternative with higher current and low IQ, but requires layout changes for the 5-pin package.

View details

Alternative comparison matrix

Feature / factor78L33TPS7A2433DBVRXC6202P332MRAlt 3Compatibility / risk
Voltage20V18V15V18V / 15V — Slightly lower max input voltage.; XC6202P332MR: Candidate has lower max input voltage.
PackageSOT-23, TO-92, etc.SOT-23-5SOT-23-3SOT-23-5 / SOT-23-3 — 5-pin package requires new layout and handling of EN pin.; XC6202P332MR: Package may not match application; pinout is different.
Current100mA200mA150mA200mA / 150mA — Higher output current capability.; XC6202P332MR: Higher output current capability.
Quiescent Current2mA2.0uA2.0uA2.0uA — Significantly lower quiescent current.; XC6202P332MR: Significantly lower quiescent current improves efficiency.

Application & sourcing insights

Questions & answers

The best alternative depends on your circuit's input voltage. For inputs below 15V, parts like XC6202P332MR offer better performance but require pinout changes. For higher voltages, a different search is needed.