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S4025LTP

Public Made by Adom

by adom

Littelfuse Thyristors (SCR)/Modules, TO-220AB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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S4025LTP

Littelfuse · Thyristors (SCR)/Modules · TO-220AB

S4025LTP from Littelfuse, in a TO-220AB. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CATHODE passive SCR cathode main terminal, labeled CATHODE on the TO-220AB L-Package drawing (the device is rated for IT(RMS) 20 A or 25 A depending on the part).
2 ANODE passive SCR anode main terminal, labeled ANODE on the TO-220AB L-Package drawing; the isolated mounting tab is limited to a maximum torque of 8 in-lbs (0.904 Nm).
3 GATE input Gate trigger terminal, labeled GATE on the drawing; the 25 A device specifies IGT 35 mA max, VGT 1.5 V max at VD = 12 V, and peak gate current IGM 3.5 A at TJ = 125°C.

Key specifications

Parameter Value
Manufacturer Littelfuse
Package TO-220AB
Category Transistors/Thyristors
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Peak repetitive off-state / reverse voltage (400V variant, part-number code 40) VDRM/VRRM 400 V Part-numbering table: 40 = 400V 9
Gate trigger current IGT 1 35 mA VD = 12V, RL = 30 Ω; Sxx25x column 2
Gate trigger voltage VGT 1.5 V VD = 12V, RL = 30 Ω 2
Critical rate of rise of off-state voltage, TJ = 100°C, 400V dv/dt 450 V/μs VD = VDRM; gate open; TJ = 100°C; 400V 2
Critical rate of rise of off-state voltage, TJ = 125°C, 400V dv/dt 350 V/μs VD = VDRM; gate open; TJ = 125°C; 400V 2
Gate non-trigger voltage VGD 0.2 V VD = VDRM, RL = 3.3 kΩ, TJ = 125°C 2
Holding current IH 50 mA IT = 400mA (initial); Sxx25x column 2
Turn-off time tq 35 μs (1) IT=2A; tp=50μs; dv/dt=5V/μs; di/dt=-30A/μs 2
On-state voltage (25A device) VTM 1.6 V 25A Device: IT = 50A; tp = 380μs 3
Peak off-state / reverse blocking current, TJ = 25°C, 400-600V IDRM / IRRM 10 μA TJ = 25°C; VDRM/VRRM 400-600V 3
Peak off-state / reverse blocking current, TJ = 100°C, 400-600V IDRM / IRRM 500 μA TJ = 100°C; VDRM/VRRM 400-600V 3
Peak off-state / reverse blocking current, TJ = 125°C, 400-600V IDRM / IRRM 1000 μA TJ = 125°C; VDRM/VRRM 400-600V 3
RMS on-state current IT(RMS) 25 A Sxx25L: TC = 75°C 2
Average on-state current IT(AV) 16 A Sxx25L: TC = 75°C 2
Peak non-repetitive surge current, 50 Hz ITSM 300 A single half cycle; f = 50Hz; TJ (initial) = 25°C 2
Peak non-repetitive surge current, 60 Hz ITSM 350 A single half cycle; f = 60Hz; TJ (initial) = 25°C 2
I2t value for fusing I2t 510 A2s tp = 8.3 ms 2
Critical rate of rise of on-state current di/dt 150 A/μs f = 60Hz; TJ = 125°C 2
Peak gate current IGM 3.5 A TJ = 125°C 2
Average gate power dissipation PG(AV) 0.8 W TJ = 125°C 2
Storage temperature range Tstg -40 150 °C 2
Operating junction temperature range TJ -40 125 °C 2
Thermal resistance, junction to case (AC) Rθ(J-C) 2.4 °C/W Sxx20L/Sxx25L (L package) 3
Thermal resistance, junction to ambient Rθ(J-A) 50 °C/W Sxx20L/Sxx25L 3

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts tin Lead Bend MIL-STD-750, M-2036 Cond E Terminal Finish 100% Matte Tin-plated 6

CAD (KiCad official)

  • Symbol: S4025LTP
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220AB (KiCad packages3D, STEP)
  • 3D model files: s4025ltp-etched.step / s4025ltp-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); s4025ltp.step / s4025ltp.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Littelfuse datasheet (9 pp, sha256 97a418a8c58d2bc0, retrieved 2026-10-15, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF