# Small-outline transistor

A small outline transistor (SOT) is a family of small footprint, discrete surface mount transistor commonly used in consumer electronics. The most common SOT are SOT23 variations,. SOT23-5 differs from SOT23 in a wider body of 1.6 mm (0.063 in) instead of 1.3 mm (0.051 in). Also, manufacturers offer the nearly identical thin small outline transistor (TSOT/TSOP) package, where lower height is important.

## SOT23, SOT323, SOT416

The SOT23 package is very popular and a common package for transistors, as well as diodes and voltage regulators.
SOT23 (TO236AB, SOT346, SC59A, TO236AA, SMT3), SOT323 (SC70-3, UMT3), SOT416 (SOT523, SC75A, SC90, EMT3) :
| | Dimensions (mm) | Dimensions (mm) | Dimensions (mm) | Dimensions (mm) |
| | SOT23 | SOT23-3 | SOT323 | SOT416 |
| A | 2.9 | 2.9 | 2.0 | |
| B | 1.3/1.6 | 1.3/1.6 | 1.25 | |
| C | | | | |
| D | | | | |
| G | 1.9 | 1.9 | 1.3 | 1.0 |
| H | | | | |
| J | | | | |
| K | | | | |
| L | 0.95 | 0.95 | 0.65 | 0.5 |
| S | | | | 1.45 - 1.75 |
| V | | | | |

## SOT23-5, SOT353, SOT553

SOT23-5 (SOT25, SC74A, TSOP-5, SOT753, MO-178AA, SMT5), SOT353 (SC70-5, SC88A, TSSOP-5, UMT5), SOT553 :
| | Dimensions (mm) | Dimensions (mm) | Dimensions (mm) |
| | SOT23-5 | SOT353 | SOT553 |
| A | 2.90 ±0.10 | 2.0 ±0.2 | 1.60 ±0.10 |
| B | 1.60 ±0.10 | 1.25 ±0.10 | 1.20 +0.05 -0.10 |
| C | 1.04 – 1.44 | 0.8 – 1.1 | 0.60 +0.02 -0.05 |
| D | 0.350 –0.500 | 0.2 – 0.3 | 0.20 +0.10 -0.05 |
| G | 0.95 | 0.65 | 0.50 |
| H | 0.05 –0.15 | ≤0.1 | 0.00 |
| J | | | 0.15 +0.03 -0.05 |
| K | | | 0.20 ±0.10 |
| S | | 2.0 – 2.2 | 1.60 +0.10 -0.05 |
| V | | | |

## SOT23-6, SOT363, SOT563

SOT23-6 (SOT26, SC59-6, SC74, TSOP-6, MO-178AB, SMT6, SM6, Mini6, SOT457), SOT363 (SC70-6, SC88, TSSOP-6, UMT6, US6, S-Mini6), SOT563 (SC-107C, ES6) :
| | Dimensions (mm) | Dimensions (mm) | Dimensions (mm) |
| | SOT23-6 | SOT363 | SOT563 |
| A | 2.9 | 2.0 | 1.60 ±0.10 |
| B | 1.625 | 1.25 | 1.20 +0.05 -0.10 |
| C | 1.25 | 0.95 | 0.60 +0.02 -0.05 |
| D | 0.4 | 0.25 | 0.20 +0.10 -0.05 |
| G | 0.95 | 0.65 | 0.50 |
| H | | 0.1 | 0.00 |
| J | | 0.18 | 0.15 +0.03 -0.05 |
| K | | 0.38 | 0.20 ±0.10 |
| S | 2.8 | 2.1 | 1.60 +0.10 -0.05 |
| V | | | |

## SOT23-8

SOT23-8 (SOT28) :
| | Dimensions (mm) |
| A | 2.90 ± 0.10 |
| B | 1.60 ± 0.10 |
| C | 1.27 |
| D | 0.3 |
| G | 0.650 typ. |
| H | 0.0762 |
| J | 0.152 |
| K | 0.575 |
| S | 2.80 ± 0.20 |
| L | |

## SOT54

SOT54 is an alternate designation for the JEDEC TO-92 package.

## SOT23-4, SOT143, SOT343

SOT23-4, SOT143 (TO253), SOT343 :
| | Dimensions (mm) | Dimensions (mm) |
| | SOT143 | SOT343 |
| A | 2.90 ±0.10 | 2.00 - 2.20 |
| B | 1.30 ±0.10 | 1.150 - 1.350 |
| C | | 0.900 - 1.100 |
| D | 0.400 +0.110 -0.030 | 0.250 - 0.400 |
| F | 0.800 +0.130 -0.030 | 0.350 - 0.500 |
| G | 1.92 +0.11 -0.14 | 1.200 - 1.400 |
| H | 0.05 +0.05 -0.037 | 0.000 - 0.100 |
| J | 0.11 +0.07 -0.025 | 0.080 - 0.150 |
| K | 0.89 - 1.00 | 0.525 |
| L | | |
| R | | |
| S | 2.38 ±0.10 | 2.150 - 2.450 |

## SOT490

SOT490 (SOT523F, SC89, EMT3F) :
| | Dimensions (mm) |
| A | |
| B | |
| C | |
| D | |
| G | 0.5 |
| J | |
| K | |
| S | |
| L | 1.0 |

## SOT89-3

The SOT89-3 electrically only has three leads (contact/pin). The wide lead (tab) is physically part of the middle lead on the other side of the package. Some call this package a SOT89-4, since it visually appears to have four leads when looking down at the part.
SOT89-3 (TO243AA, SC62, MPT3) :
| | Dimensions (mm) |
| A | 4.5 |
| B | 2.5 |
| C | 1.5 ± 0.1 |
| D | |
| E | 1.6 |
| F | |
| G | 1.5 |
| J | |
| K | |
| S | |
| L | 3 |

## SOT89-5

The SOT89-5 electrically only has five leads (contact/pin). The middle lead is physically part of the middle lead on the other side of the package. Some call this package a SOT89-6, since it visually appears to have six leads when looking down at the part.
SOT89-5 :
| | Dimensions (mm) |
| A | 4.6 |
| B | 2.6 |
| C | 1.6 |
| D | |
| E | |
| F | |
| G | 1.5 |
| H | |
| J | |
| K | |
| S | |
| L | |

## SOT223 (SOT223-4)

The SOT223-4 package is a popular package for voltage regulators. It was introduced by Philips.
SOT223-4 (SC73, TO261AA) :
| | Dimensions (mm) | Dimensions (mm) | Dimensions (mm) |
| | Min | Typ | Max |
| A | | | 1.80 |
| A1 | | 0.02 | |
| b | 0.60 | 0.70 | 0.80 |
| b2 | 2.90 | 3.00 | 3.10 |
| c | 0.24 | 0.26 | 0.32 |
| D | 6.30 | 6.50 | 6.70 |
| e | | 2.3 | |
| e1 | | 4.6 | |
| E | 6.70 | 7.00 | 7.30 |
| E1 | 3.30 | 3.50 | 3.70 |

## SOT223-5

The SOT223-5 package is a popular package for voltage regulators.
SOT223-5 :
| | Dimensions (mm) | Dimensions (mm) | Dimensions (mm) |
| | Min | Typ | Max |
| A | | 1.8 | |
| A1 | 0.02 | 0.04 | 0.10 |
| A2 | 1.55 | | 1.65 |
| A3 | 0.87 | | 0.91 |
| b | 0.41 | 0.46 | 0.51 |
| b2 | 2.95 | 3.00 | 3.05 |
| C | 0.24 | | 0.32 |
| D | 6.45 | 6.50 | 6.55 |
| E | 6.86 | 7.00 | 7.26 |
| E1 | 3.45 | 3.50 | 3.55 |
| e | | 1.27 | |
| e1 | | 5.08 | |
| L | 0.91 | | 1.14 |

## SOT223-8

The SOT223-8 package is a popular package for bridged quad transistors.
SOT223-8 (SM-8) :
| | Dimensions (mm) | Dimensions (mm) | Dimensions (mm) |
| | Min | Typ | Max |
| A | | 1.60 | 1.70 |
| A1 | 0.02 | 0.04 | 0.10 |
| b | 0.70 | 0.80 | 0.90 |
| c | 0.24 | 0.28 | 0.32 |
| D | 6.30 | 6.60 | 6.70 |
| e | | 1.53 | |
| e1 | | 4.59 | |
| E | 6.70 | 7.00 | 7.30 |
| E1 | 3.30 | 3.50 | 3.70 |
| L | 0.75 | 0.90 | 1.00 |
| ø | | 45° | |
| ø1 | | | 15° |
| ø2 | | 10° | |