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STD 78xx Replacement

License: CC-BY-SA 3.0

Mode: Editors' pick

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Update time: 2022-11-24 18:54:31
Creation time: 2022-08-03 07:29:44
Description
# 78xx Replacement (SD8942) Replace your old 78xx voltage regulators with this much more efficient pin-compatible buck converter. ![78xx_Replacement_pic1.jpg](https://raw.githubusercontent.com/wagiminator/Power-Boards/master/78xx_Replacement_SD8942/78xx_Replacement_pic1.jpg) ![78xx_Replacement_pic2.jpg](https://raw.githubusercontent.com/wagiminator/Power-Boards/master/78xx_Replacement_SD8942/78xx_Replacement_pic2.jpg) |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| ![78xx_Replacement_SD8942_performance1.png](https://raw.githubusercontent.com/wagiminator/Power-Boards/master/78xx_Replacement_SD8942/78xx_Replacement_SD8942_performance1.png) ![78xx_Replacement_SD8942_performance2.png](https://raw.githubusercontent.com/wagiminator/Power-Boards/master/78xx_Replacement_SD8942/78xx_Replacement_SD8942_performance2.png) ![78xx_Replacement_SD8942_scope1.jpg](https://raw.githubusercontent.com/wagiminator/Power-Boards/master/78xx_Replacement_SD8942/78xx_Replacement_SD8942_scope1.jpg) 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)
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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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