Is there a pin-compatible replacement for LP2981-33DBVR?

Several Texas Instruments LDOs like TPS7A2433DBVR use the same SOT-23-5 package, but pinout must be verified against datasheets to confirm direct pin-to-pin compatibility for your board layout.

What risks should I check before replacing LP2981-33DBVR?

Key risks include differences in minimum/maximum input voltage, dropout voltage under load, and quiescent current. Always verify the candidate's pinout matches the LP2981-33DBVR's configuration on your PCB.

LP2981-33DBVR Alternatives, Datasheet & Cross Reference | Texas Instruments

LP2981-33DBVR is a 3.3V, 100mA low-dropout regulator in a SOT-23-5 package. When seeking alternatives, key parameters include the wide 2.2V to 16V input range, dropout voltage, and pin compatibility.

AI replacement insight

Electrical riskmedium

Candidate input voltage ranges differ from the target.

Package risklow

Package matches, but pinout must be verified to be considered drop-in.

Sourcing risklow

Proposed alternatives are active parts from the same manufacturer.

Can it be replaced directly?

No direct drop-in replacement is confirmed without pinout verification. TPS7A2433DBVR is a close functional match but has a different minimum input voltage.

Best replacement path

Consider TPS7A2433DBVR for higher current and lower quiescent current, if the application's minimum supply voltage is above 2.4V.

Main risk

The primary risk is electrical incompatibility, specifically the minimum input voltage requirement and potential pinout differences.

Recommended alternatives

Functional alternative with higher current (200mA) but requires a slightly higher minimum input voltage.

View details

Alternative comparison matrix

Feature / factor	LP2981-33DBVR	TPS7A2433DBVR	TPS76133DBVR	Compatibility / risk
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5 — Form factor matches.; TPS76133DBVR: Form factor matches.
Voltage	2.2V to 16V	2.4V to 18V	170 mV @ 100mA	2.4V to 18V / 170 mV @ 100mA — Min input voltage is higher (2.4V vs 2.2V).; TPS76133DBVR: Lower dropout voltage is an improvement.
Current	600 µA	2.0 µA	100 mA	2.0 µA / 100 mA — Significantly lower quiescent current.; TPS76133DBVR: Output current matches.

Application & sourcing insights

Questions & answers

TPS7A2433DBVR is a strong functional alternative with higher current (200mA) and lower quiescent current, but requires a slightly higher minimum input voltage of 2.4V. Engineering review is recommended.