COMPONENT PACKAGES

SOT-23 Component Package

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Overview

NameSOT-23 (Small Outline Transistor 23)
Synonyms

SOT-23-3

  • Micro3
  • SC-59 (JEITA)
  • SOT-23 (TopLine)
  • SOT-346
  • SSOT3 (Fairchild Semiconductor)
  • TO-236AA (JEDEC)
  • TO-236AB (NXP)

SOT-23-5

  • SC-74A (JEITA)
  • SOT-753
  • SOT-25 (TopLine)

SOT-23-6

  • SC-74 (JEITA)
  • SMT6 (ROhm)
  • SOT-26 (SOT-23-6 by TopLine)
  • SOT-457 (JEDEC)

SOT-23-8

  • RJ-8 (Analog Devices)
  • SM8 (Diodes Incorporated)
  • SOT-28 (TopLine)
VariantsThere are 3-pin (SOT-23-3), 5-pin (SOT-23-5), 6-pin (SOT-23-6) and 8-pin (SOT-23-8) variants.
Similar Ton/a
MountingSMD
Pin Count3, 5, 6, 8
Pitch
  • 0.65mm (SOT-23-8)
  • 0.95mm (SOT-23-3, SOT-23-5, SOT-23-6)
SolderabilityEasy to hand-solder if you have had a bit of practise with surface mount devices before. Easy to solder with infrared or reflow techniques.
Thermal ResistanceSOT-23-5: 230°C/W
DimensionsThe body of all SOT-23-x packages is 1.30x2.92mm.
3D Modelsn/a
Common Uses
  • Linear regulators
  • Op-amps
  • Transistors
  • MOSFET's
  • Diodes (including diode arrays)
  • Battery management IC's
  • Analogue active linear temperature sensors

Comments

A very common surface-mount package that is used for a huge number of functions. Variations exist with 3 to 8 pins.

The SOT-23 family probably has the largest number of differing variant names which all refer to the same packages.

A 3D render of the SOT-23 component package.

A 3D render of the SOT-23 component package.

The number of pins used not only depends on the required number of connections but also the desired thermal resistance (high-current SOT23 devices may use more than one pin for the same net to improve thermal performance). Used commonly for FET’s transistors, diodes, and other components only having a small number of leads. SparkFun makes a SOT-23 to DIP breakout board.

A 3D render of the SOT-23-6 (SOT-457) component package.

A 3D render of the SOT-23-6 (SOT-457) component package.

Dimensions

Dimensions for the SOT-23-8 component package. Image from http://www.diodes.com/.

Dimensions for the SOT-23-8 component package. Image from http://www.diodes.com/.

Footprint

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).

However, the 8 lead variant, SOT-23-8, has a smaller pitch of 0.65mm

A recommended footprint for the SOT-23-8 component package. Image from http://www.diodes.com/.

A recommended footprint for the SOT-23-8 component package. Image from http://www.diodes.com/.

SOT-23-6

Non-standard Pin Numbering

The Rohm SOT-23-6 component package (a.k.a. SOT-457, IMT4) with non-standard pin numbering.

The Rohm SOT-23-6 component package (a.k.a. SOT-457, IMT4) with non-standard pin numbering.

Why you’d ever number the package in that manner is beyond me. It’s dangerous, and bound to cause PCB designers to do board respins!

Other Images

The dimensions of the SOT-23-5 component package.

The dimensions of the SOT-23-5 component package.


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