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Std edition 78xx Replacement
Profile：Efficient Replacement for the old 78xx Voltage Regulators
License: CC-BY-SA 3.0
Description
# 78xx Replacement (SD8942)
Replace your old 78xx voltage regulators with this much more efficient pin-compatible buck converter.
|Parameter|Value|
|:-|:-|
|Input Voltage|4.5V - 16V|
|Output Voltage|Selectable via Resistors R1 and R2: V = 0.6 * (R1 / R2 + 1)|
|Output Current|max 2A|
|Output Voltage|R1|R2|
|-:|-:|-:|
|12.2V|91kΩ|4.7kΩ|
|12V|82kΩ|4.3kΩ|
|9.2V|43kΩ|3kΩ|
|9V|140kΩ|10kΩ|
|6.2V|140kΩ|15kΩ|
|6V|102kΩ|11.3kΩ|
|5.3V|100kΩ|13kΩ|
|5.2V|115kΩ|15kΩ|
|5.1V|75kΩ|10kΩ|
|5V|110kΩ|15kΩ|
|3.5V|107kΩ|22.1kΩ|
|3.4V|56kΩ|12kΩ|
|3.3V|115kΩ|25.5kΩ|
1. [SD8942 Datasheet](https://datasheet.lcsc.com/lcsc/1808081634_SHOUDING-SD8942_C250795.pdf)
2. [MT2492 Datasheet](https://datasheet.lcsc.com/lcsc/1810262207_XI-AN-Aerosemi-Tech-MT2492_C89358.pdf)
3. [L78S Datasheet](https://datasheet.lcsc.com/lcsc/1811141732_STMicroelectronics-L78S05CV_C33043.pdf)
4. [TI Voltage Divider Calculator](https://www.ti.com/download/kbase/volt/volt_div3.htm)
Design Drawing
schematic diagram
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| ID | Name | Designator | Footprint | Quantity | BOM_Supplier | BOM_Manufacturer | BOM_Manufacturer Part | BOM_Supplier Part |
|---|---|---|---|---|---|---|---|---|
| 1 | 22n | C1 | C_0603_S | 1 | LCSC | SAMSUNG | CL10B223KB8NNNC | C21122 |
| 2 | 10u | C2 | C_0603_S | 1 | LCSC | FH | 0603X106K160NT | C70225 |
| 3 | 22u | C3,C4 | C_0603_S | 2 | LCSC | SANYEAR(叁叶源) | C0603X5R226M160NT | C2835567 |
| 4 | PINS | J1 | 210S-3X1/2.54 | 1 | LCSC | BOOMELE | Header2.54mm 1*3P | C49257 |
| 5 | 4.7uH | L1 | L_0850 | 1 | LCSC | PROD Tech | PSPMAA0805-4R7M-ANP | C2962882 |
| 6 | 110k | R1 | R_0603_S | 1 | LCSC | UniOhm | 0603WAF1103T5E | C25805 |
| 7 | 15k | R2 | R_0603_S | 1 | LCSC | UniOhm | 0603WAF1502T5E | C22809 |
| 8 | 100k | R3 | R_0603_S | 1 | LCSC | UniOhm | 0603WAF1003T5E | C25803 |
| 9 | SD8942 | U2 | SOT-23-6 | 1 | LCSC | SHOUDING | SD8942 | C250795 |
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