78M09 9V 0.5A Positive Voltage Regulator SOT-252
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Prices updated: 12 Oct 2026
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About this product
78M09 is a fixed 9 V positive three-terminal voltage regulator in an SMD SOT-252 (DPAK) package, rated for up to 0.5 A output. The listing identifies it as the LM7809 family in SOT-252 with marking code 78M09. It includes thermal overload, short-circuit and safe-area protection, and is used to create a 9 V rail from a higher input voltage.
Specifications
- Output voltage
- 9 V
- Output current
- 0.5 A
- Package
- SOT-252 (DPAK) SMD
- Protection
- Thermal overload, short circuit, SOA
- Regulator type
- Positive fixed linear
Frequently asked questions
What input voltage is needed?
The input must be higher than 9 V. Linear 78xx regulators typically need about 2 V above the output to regulate properly, so an input of around 11 V or more is needed.
Does it need a heatsink?
The heat dissipated grows with the input-to-output voltage difference and the load current. Mount it on a copper pad or heatsink as needed, especially when running near 0.5 A.
