SOT-143 Component Package

The SOT-143 (Small-outline Transistor 143) is a smallish 4-pinned SMD package which is easily distinguishable by having one wider lead compared with the other 3.

A 3D model of the SOT-143 component package¹. On the upside down render, you can clearly see the 1 wider lead.

Synonyms

• PG-SOT143-4-4: Used by Infineon².
• SOT143-4: Used by ST Microelectronics³.
• TO-253-4
• TO-253AA: JEDEC⁴.

Variants

• SOT-143
• SOT-143B (used for RF BJTs, unsure on difference to SOT-143)
• SOT-143R (used for RF BJTs, unsure on difference to SOT-143)

Dimensions

• Body Length D: 2.9mm²
• Body Width E1: 1.3mm (excl. leads)^{2 3}
• Total Width E: 2.4mm (incl. leads)³
• Height (avg.): 1.0mm³

Pitch is 1.92mm (between centers of leads on same side, excluding larger lead³).

Recommended Land Pattern

Typical PCB Land Area: $7.29mm^2\ (2.7\times 2.7mm)$².

Common Uses

• TVS diodes
• PMIC supervisors

Footnotes

1. DigiKey. PMIC - Supervisors > STMicroelectronics STM6315RBW13F (product page). Retrieved 2022-04-26, from https://www.digikey.co.nz/en/products/detail/stmicroelectronics/STM6315RBW13F/1117553. ↩

2. Infineon. Packages > PG-SOT143 > PG-SOT143-4-4. Retrieved 2022-04-26, from https://www.infineon.com/cms/en/product/packages/PG-SOT143/PG-SOT143-4-4/. ↩ ↩² ↩³ ↩⁴

3. ST Microelectronics (2007, Mar). STM6315: Open drain microprocessor reset (datasheet). Retrieved 2022-04-26, from https://www.st.com/content/ccc/resource/technical/document/datasheet/64/6b/44/43/61/e6/41/d5/CD00081393.pdf/files/CD00081393.pdf/jcr:content/translations/en.CD00081393.pdf. ↩ ↩² ↩³ ↩⁴ ↩⁵

4. Analog Devices. 4-Lead Small Outline Transistor Package [SOT-143] (RA-4). Retrieved 2022-04-26, from https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/sot-143ra/ra_4.pdf. ↩