L78M09CDT-TR
STMicroelectronics
Needs validationhigh risk
Functional alternative from STMicroelectronics with higher current, but in a larger DPAK package.
Best Alternatives to 78L09-150
The 78L09-150 is a 9V fixed positive linear voltage regulator in a compact SOT-23 or SOT-89 package, capable of supplying up to 150mA. It's a common choice for low-power, local voltage regulation.
AI replacement insight
Package riskhigh
No candidates match the SOT-23 or SOT-89 package, requiring a PCB redesign.
Electrical risklow
Several candidates meet or exceed the target's key voltage and current ratings.
Sourcing riskmedium
Alternatives from major brands like ST may offer better availability than the target.
Can it be replaced directly?
No direct, drop-in replacement for the 78L09-150 has been identified. All functional alternatives require a change in the PCB layout due to different package types.
Best replacement path
Search for 9V linear regulators in SOT-23 or SOT-89 packages with at least 150mA output current. Prioritize parts with the same pinout (Input, GND, Output).
Main risk
The primary risk is physical incompatibility. All reviewed alternatives are in different packages, making them not drop-in replacements.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | 78L09-150 | L78M09CDT-TR | 78M09 | LM7809T | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-89, SOT-23 | DPAK (TO-252) | TO-252 | TO-220-3 | DPAK (TO-252) / TO-220-3 / D²PAK — Different surface-mount footprint. Not a drop-in replacement.; 78M09: Different surface-mount footprint (DPAK). Not a drop-in replacement.; LM7809T: Through-hole vs. Surface-mount. Not a drop-in replacement.; L7809CD2T-TR: Much larger surface-mount package. Not a drop-in replacement. |
| Voltage | 30V | 35V | 35V | 35V | 35V / Not specified — Higher max input voltage.; 78M09: Higher max input voltage.; LM7809T: Higher max input voltage provides more margin.; L7809CD2T-TR: Max input voltage missing, requires datasheet check. |
| Current | 0.15A | 0.5A | 0.5A - 1.0A | 1.2A | 0.5A / 0.5A - 1.0A / 1.2A / 1.5A — Higher current capability.; 78M09: Higher current capability. Data varies between sources.; LM7809T: Higher current capability.; L7809CD2T-TR: Significantly higher current capability. |
Application & sourcing insights
Questions & answers
Finding a direct replacement requires matching the 9V output, 150mA current, and SOT-23/SOT-89 package. While many 9V regulators exist, most come in different packages requiring board changes.