

Overview
The SMF4L33A is an uncategorised made by MDD in a SOD-123FL package with 2 pins. SOD-123FL ESD and Surge Protection (TVS/ESD) ROHS.
PCBKit's library has its footprint (Diode_SMD:D_SOD-123F, from KiCad's library), ready for a KiCad board. 3 are in stock at JLCPCB (part C54876480). 1 open-source board in 1 repository on GitHub use it.
Symbol
The library has no symbol for this part yet.
Footprint
Parameters
10- Clamping Voltage
- 53.3V
- Number of Channels
- Single-channel
- Operating Temperature
- -55℃~+150℃
- Peak Pulse Current (Ipp)
- 7.5A@10/1000us
- Peak Pulse Power Dissipation (Ppp)
- 400W@10/1000us
- Polarity
- Unidirectional
- Reverse Leakage Current (Ir)
- 1uA
- Reverse Stand-Off Voltage (Vrwm)
- 33V
- Type
- TVS
- Voltage - Breakdown
- 40.6V
Order codes
1- SMF4L33ALCSC C54876480
Open-source boards using it
All 1- 4 layers95 × 55 mm

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Is there a KiCad symbol and footprint for the SMF4L33A?
Yes. the footprint Diode_SMD:D_SOD-123F, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the SMF4L33A?
SOD-123FL, with 2 pins. Its footprint is drawn on this page.
Where can I order the SMF4L33A?
JLCPCB lists it as part C54876480, with 3 in stock; the sellers' links on this page open their listings.
What can replace the SMF4L33A?
Parts like it in the library: the BNPTVS33VS1UR by BORN, the PTVS33VS1UR,115-ES by ElecSuper, the S-P4SODJ33A-SH by Leshan Radio (LRC) and the SM4FJ33A by BORN. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the SMF4L33A?
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8BNPTVS33VS1UR
SOD-123FLSOD-123FL ESD and Surge Protection (TVS/ESD) ROHSBORNUncategorisedPTVS33VS1UR,115-ES
SOD-123FSOD-123F ESD and Surge Protection (TVS/ESD) ROHSElecSuperUncategorisedS-P4SODJ33A-SH
SOD-123FLSOD-123FL ESD and Surge Protection (TVS/ESD) ROHSLeshan Radio (LRC)UncategorisedSM4FJ33A
SOD-123FL-55℃~+150℃ 1uA 33V 40.6V 53.3V 7.5A@10/1000us TVS Unidirectional SOD-123FL ESD and Surge Protection (TVS/ESD) ROHSBORNUncategorisedSJD12A33L01
SOD-123FL-55℃~+150℃ 1kW@8/20us 1uA 3.8A 33V 40.6V 53.3V IEC 61000-4-2 Unidirectional SOD-123FL ESD and Surge Protection (TVS/ESD) ROHSTECH PUBLICUncategorisedSMF33CA
SOD-123FL-55℃~+150℃ 1 1uA 200W@10/1000us 3.8A@10/1000us 33V 40.6V 53.3V Bidirectional IEC 61000-4-2 TVS SOD-123FL ESD and Surge Protection (TVS/ESD) ROHSbaochengUncategorisedSM4F33A
SOD-123FL-55℃~+150℃ 1uA 33V 40.6V 400W@10/1000us 53.3V 7.5A TVS SOD-123FL ESD and Surge Protection (TVS/ESD) ROHSPDWUncategorisedSE33VFBD122F
SOD-123FLUncategorisedSSGSEMI