component
SZP6SMB20AT3G
Public Made by Adomby adom
Littelfuse ESD And Surge Protection (TVS/ESD), SMB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Contents
README
markdownSZP6SMB20AT3G
Littelfuse · ESD And Surge Protection (TVS/ESD) · SMB
SZP6SMB20AT3G from Littelfuse, in a SMB. 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 | Cathode terminal of the unidirectional TVS, marked by the color band on the package; the SZP6SMB20AT3G is a uni-directional part (suffix A, not CA). |
| 2 | Anode | passive | Anode terminal of the unidirectional TVS, opposite the cathode band, for clamping transients at the 20 V working peak reverse voltage (VRWM 17.1 V min, 20 V nom, 21 V max breakdown range on page 3). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMB |
| Category | Circuit Protection |
| Pins | 2 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Breakdown voltage (VBR), minimum | VBR | 19 | V | @ IT = 1 mA (Note 7), TA = 25°C | 3 | ||
| Breakdown voltage (VBR), nominal | VBR | 20 | V | @ IT = 1 mA (Note 7), TA = 25°C | 3 | ||
| Breakdown voltage (VBR), maximum | VBR | 21 | V | @ IT = 1 mA (Note 7), TA = 25°C | 3 | ||
| Maximum reverse leakage current | IR | 5 | µA | @ VRWM (17.1 V) | 3 | ||
| Peak power dissipation | PPK | 600 | W | TL = 25°C, pulse width = 1 ms, 10/1000 µs non-repetitive (Note 1) | 1 | ||
| DC power dissipation at TL = 75°C (measured zero lead length) | PD | 3 | W | TL = 75°C, measured zero lead length (Note 2) | 1 | ||
| Derate above 75°C (lead) | 40 | mW/°C | Derate above TL = 75°C (Note 2) | 1 | |||
| Thermal resistance, junction-to-lead | RθJL | 25 | °C/W | Measured zero lead length (Note 2) | 1 | ||
| DC power dissipation at TA = 25°C | PD | 0.55 | W | TA = 25°C, Littelfuse minimum recommended footprint (Note 3) | 1 | ||
| Derate above 25°C (ambient) | 4.4 | mW/°C | Derate above TA = 25°C (Note 3) | 1 | |||
| Thermal resistance, junction-to-ambient | RθJA | 226 | °C/W | FR-4 board, Littelfuse minimum recommended footprint (Note 3) | 1 | ||
| Forward surge current | IFSM | 100 | A | TA = 25°C, 1/2 sine wave (or equivalent square wave), PW = 8.3 ms, 4 pulses per minute max (Note 4), unidirectional only | 1 | ||
| Operating and storage temperature range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Working peak reverse voltage | VRWM | 17.1 | V | 3 | |||
| Clamping voltage | VC | 27.7 | V | @ IPP = 22 A (Note 8) | 3 | ||
| Temperature coefficient of breakdown voltage (column printed %/°C) | 0.09 | %/°C | 3 | ||||
| Typical junction capacitance | C | 910 | pF | Bias voltage = 0 V, F = 1 MHz, TJ = 25°C (Note 9) | 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 | and the terminal finish material is tin(Sn) (IPC/ | 1 |
CAD (KiCad official)
- Symbol:
SZP6SMB20AT3G - Footprint:
Diode_SMD:D_SMB - 3D model: SMB (KiCad packages3D, STEP)
- 3D model files:
szp6smb20at3g-etched.step/szp6smb20at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);szp6smb20at3g.step/szp6smb20at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
baf561fbcd6cd66c, retrieved 2026-10-16, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).