SOT-23 (Small Outline Transistor 23) is the JEDEC code for a family of very popular medium-sized SMD packages with 3 to 8 gull-wing leads.
When surface mount components were just beginning to gain popularity,
SOT-23 was introduced to replace the well used through-hole 3-pin TO-18 and TO-92 transistor packages, and so the first variant of
SOT-23 was the 3 leaded version (
SOT-23-3, officially called
TO-236AA by JEDEC)1.
The SOT-23 family probably has the largest number of differing variant names which all refer to the same packages (see the synonym section above).
The number of pins used not only depends on the required number of connections but also the desired thermal resistance (high-current
SOT-23 devices may use more than one pin for the same net to improve thermal performance). SparkFun makes a SOT-23 to DIP breakout board.
The 3, 5, and 6 pin
SOT-23 variants have the same pitch of 0.95mm, and all are compatible with the 6 pin footprint (which means you can use a
SOT-23-6 adapter board for the 3 and 5 pin variants also).
SOT-23-8 has a smaller pitch to fit all the leads on the package.
JEDEC formalized the dimensions of the
SOT-23 package (and all it’s variants) in the MO-178 document (with package designator
R-PDSO-G). After registering, you can download this document for free from (https://www.jedec.org/standards-documents/docs/mo-178-c)[https://www.jedec.org/standards-documents/docs/mo-178-c].
The SOT-23F package is closely related to the
SOT-23 put has flat leads instead of gull-wing leads.
The body of all
SOT-23-x packages is 1.30x2.92mm. The component area taking into account the leads is 7.98mm² (2.9x2.75mm). The standard land area is 11.22mm² (3.3x3.4mm).
Easy to hand-solder if you have had a bit of practise with surface mount devices before. Easy to solder with infrared or reflow techniques.
R-PDSO-G is the JEDEC package designator for SOT-23 in all it’s variants2.
SOT-23-3 is the most common package in the
SOT-23 family, and is sometimes just referred to as
ERROR: fig-sot-23-3-3d-render-nisshinbo REF NOT FOUND shows a 3D render of the SOT-23-3 package by Nisshinbo.
1-3G1G: Toshiba’s package code4.
2-3AB1A: Toshiba package code5.
318D-04: onsemi package code6.
526AG: Fairchild Semiconductor’s package code7.
Micro3: International Rectifier package code8.
MPAK: NXP Semiconductors’ package code9.
RT-3: Analog Devices package code10.
S3: Analog Devices package code, seems like it a legacy code from when Linear Technology existed11
SC-59: JEITA EIAJ code12.
SMT3: Rohm Semiconductor code12, NXP Semiconductors’ package code9.
SOT-23: Informal JEDEC name. If no additional number is provided, assume
SOT-23has 3 pins.
SOT-23-3: Informal JEDEC name.
SOT-346: Some manufacturers consider the
SOT-346to be different packages, and others conflate the two. I’ve decided to bundle them together, because after sifting through dimensions on many datasheet they generally have overlapping and very similar numbers, making them equivalent for most use cases. But I must stress, always check the datasheet!
SSOT3: The name used by Mouser for Fairchild Semiconductor parts (presumably an abbreviation of
SuperSOT-3: Fairchild Semiconductor’s brand name7.
TO-236AA: Formal JEDEC code (see note below).
TO-236AB: Formal JEDEC code (see note below)5.
TO-236MOD: JEDEC code according to Toshiba4.
TO-236AB are official JEDEC names for the
SOT-23-3 package. An image comment on Wikipedia14 states that the
TO-236AB package is approximately 0.1mm higher. However it is hard to verify this claim by comparing manufacturer package dimensions, as 0.1mm is well with the manufacturing tolerances.
- Pitch: 1.9mm
- Body: 1.3mm wide, 2.9mm long, 1.0mm high
- Body + Leads: 2.5mm wide, 2.9mm long
ERROR: fig-package-dimensions-sot23-3 REF NOT FOUND shows the dimensions of the
Recommended Land Pattern
ERROR: fig-sot-23-3-recommend-land-pattern-nxp REF NOT FOUND shows the recommended land pattern by NXP for the
Because of the 3 leads,
SOT-23-3 is used for a large number of low-power 2-3 lead devices such as linear regulators, BJTs, MOSFETs and diodes (sometimes with two diodes, sharing either a common anode or cathode).
- Linear regulators
- Diodes (including diode arrays)
ERROR: fig-sot-23-5-3d-render-direnc REF NOT FOUND shows a 3D render of the
SOT-23-5 package from Direnc.
RJ-5: Analog Devices
ERROR: fig-sot-23-5-dimensions-bourns REF NOT FOUND shows the dimensions of the
SOT-23-5 package from Bourns.
Recommended Land Pattern
ERROR: fig-sot-23-5-recommended-land-pattern-bourns REF NOT FOUND shows a recommended land pattern from Bourns for the
- Linear voltage regulators
SOT-23-3 package is very similar to the SOT-346 package, with many manufacturer’s dimensions for the two packages coinciding, and in many cases the same PCB land pattern will work with both packages.
ERROR: fig-component-package-sot-23-6-sc-74a-sot-457-3d-render REF NOT FOUND shows a 3D render of the
SOT-23-6 component package.
RJ-6: Analog Devices
SMT6: Rohm Semiconductor
SOT-26: SOT-23-6 by TopLine
Non-standard Pin Numbering
SOT-23-6 package by Rohm (a.k.a
SMT6) has non-standard, clockwise pin numbering starting at the top right pin.
SOT-23-6 has a pitch of 0.95mm.
RJ-8: Analog Devices
SM8: Diodes Incorporated
The SOT-23-8 has a different pitch to the other packages in the family of 0.65mm, so it can fit 4 leads on each side.
Recommended Land Pattern
SOT-23-8has a smaller pitch of 0.65mm compared to the
SOT-23-6which all have a pitch of 0.95mm. This is to fit the 4 pins on each side, the original
SOT-23design (which is a synonym for
SOT-23-3) only had room for a maximum of 3 pins per side.
Nisshinbo Micro Devices Inc. SOT-23-3 [Package Information]. _Retrieved 2023-07-22, from https://www.nisshinbo-microdevices.co.jp/en/design-support/package/sot-23-3.html. ↩︎
Toshiba (2001, Jun 7). 1SS398 - Silicon Epitaxial Planar Diode [Datasheet]. Retrieved 2023-07-23, from https://docs.rs-online.com/d0bb/0900766b80849698.pdf. ↩︎ ↩︎
Toshiba. SOT23 [Package Information]. Retrieved 2023-07-22, from https://toshiba.semicon-storage.com/ap-en/semiconductor/design-development/package/detail.SOT23.html. ↩︎ ↩︎
onsemi (2012, Jul). M1MA151KT1, M1MA152KT1 - Single Silicon Switching Diodes [Datasheet]. Retrieved 2023-07-23, from https://www.onsemi.com/pdf/datasheet/m1ma151kt1-d.pdf. ↩︎
International Rectifier (2014, Apr 28). IRLML6401PbF - HEXFET Power MOSFET [Datasheet]. Retrieved 2023-07-22, from https://www.infineon.com/dgdl/Infineon-IRLML6401-DataSheet-v01_01-EN.pdf?fileId=5546d462533600a401535668b96d2634. ↩︎
Analog Devices. 3-Lead Small Outline Transistor Package - SOT-23-3 (RT-3) [Package Information]. Retrieved 2023-07-22, from https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/sot-23-3-rt/rt_3.pdf. ↩︎
Analog Devices. S3 Package - 3-Lead Plastic SOT-23 (Reference LTC DWG # 05-08-1631 Rev D) [Package Information]. Retrieved 2023-07-22, from https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-sot-23/sot3%2005-08-1631%20rev%20d.pdf. ↩︎
Rohm Semiconductor. 2SB1590K - Low frequency amplifier [Datasheet]. Retrieved 2023-07-23, from https://fscdn.rohm.com/en/products/databook/datasheet/discrete/transistor/bipolar/2sb1590kt146q-e.pdf. ↩︎ ↩︎
Mouser. FDN5632N-F085 [Product Page]. Retrieved 2023-07-24, from https://www.mouser.com/ProductDetail/onsemi-Fairchild/FDN5632N-F085?qs=THZS4U49PK5JFq8XNv2RZA%3D%3D. ↩︎
NXP (2017, Jan 9). SOT-23 - plastic, surface-mounted package; 3 terminals; 1.9 mm pitch; 2.9 mm x 1.3 mm x 1 mm body [Package Information]. Retrieved 2023-07-22, from https://www.nxp.com/docs/en/package-information/SOT23.pdf. ↩︎
Direnc. TPS70950DBVR - SOT23-5 5V 150m Linear Voltage Regulator [Product Page]. Retrieved 2023-07-22, from https://www.direnc.net/tps70950dbvr-sot23-5-5v-150m-lineer-voltaj-regulator-en. ↩︎
Bourns (2008, Jun). SOT23-5 [Package Information]. Retrieved 2023-07-22, from https://www.bourns.com/docs/Product-Datasheets/sot23-5.pdf. ↩︎
This work is licensed under a Creative Commons Attribution 4.0 International License .
- TO-236AA Component Package
- TO-236AB Component Package
- SC-101 Component Package
- TO-273AA Component Package
- D2PAK Component Package
- component packages
- PCB design
- Analog Devices