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Development Board for the STM32F042

Development Board for the STM32F042

Bill of materials

Here’s the full bill-of-materials for this board, along with Farnell product code numbers to help you put together an order basket.

Identifiers Value Quantity Description Footprint Farnell code
C1, C9 10n 2 Ceramic capacitors 0603 1709947
C2, C4, C7 100n 3 Ceramic capacitors 0603 1759122
C5, C6 22p 2 Ceramic capacitors 0603 2309012
C3, C8 4.7µ 2 Ceramic capacitors 0603 2320811
C10 1 Ceramic capacitors 0603 1759399
C11, C12 22µ 2 Ceramic capacitors 0805 2309030
D1 STPS0520Z 1 Schottky diode[1] SOD123 1467545
D2, D3 green , red 2 LEDs 0603 [2]
FB1 BLM18PG221SN1D 1 Ferrite bead[1] 0603 1515740
L1 LQH44PN3R3MP0L 1 Inductor[1] 4x4mm 1782797
P1 USB Mini B 1 USB connector custom [3]
P2 1 Header, 9-Pin, Dual row 2.54mm [4]
P3 1 Header, 2-Pin, Dual row 2.54mm [4]
P4 1 Header, 5-Pin, Dual row 2.54mm [4]
P5 1 Header, 10-Pin, Dual row 2.54mm [4]
P6 1 Header, 2-Pin, Dual row 2.54mm [4]
Q1 MMBT3904 1 NPN transistor SOT23-3 1773602
R1, R4, R9 100k 3 Chip SMD resistor 0603 2447226
R2, R3 0 2 Chip SMD resistor 0603 2309106
R5 45.3k 1 Chip SMD resistor 0603 2059468
R6 10k 1 Chip SMD resistor 0603 9238603
R7, R17 330 2 Chip SMD resistor 0603 2331995
R8 1k 1 Chip SMD resistor 0603 2447272
U1 USBLC6-2SC6 1 USB ESD protection SOT23-6 1269406
U2 STM32F042F6P6 1 MCU TSSOP-20 2469549
U3 LMR10515 1 Switching regulator SOT23-5 2064682
Y1 FOXSLF/080-20 1 8MHz crystal HC49 2063945



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[1] These components must be rated in excess of the current that you plan to draw. My recommendations support a maximum of 500mA.

[2] 0603 SMD resistors are so cheap on ebay that I recommend you buy some there. I used green for the power LED and amber for the GPIO LED.

[3] The USB mini-B PCB connector is a common footprint that’s very cheaply available on ebay. See the high-resolution photograph in this article and compare to ebay auction photographs.

[4] Dual-row 2.54mm pin headers are very cheap on ebay.

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