component
SZ1SMA170AT3G
Public Made by Adomby adom
Littelfuse ESD And Surge Protection (TVS/ESD), DO-214AC(SMA). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownSZ1SMA170AT3G
Littelfuse · ESD And Surge Protection (TVS/ESD) · DO-214AC(SMA)
SZ1SMA170AT3G from Littelfuse, in a DO-214AC(SMA). 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 of the uni-directional TVS, identified by the color band on the package; the device is rated for a working peak reverse voltage (VRWM) of 170 V and 400 W peak pulse power. |
| 2 | Anode | passive | Anode of the uni-directional TVS; at VRWM 170 V the maximum reverse leakage is 2.5 µA, and the clamping voltage is 275 V at a peak pulse current of 1.5 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | DO-214AC(SMA) |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak Power Dissipation | PPK | 400 | W | TL = 25°C, Pulse Width = 1 ms (note 1: 10 X 1000 µs, non-repetitive) | 1 | ||
| DC Power Dissipation @ TL = 75°C | PD | 1.5 | W | Measured zero lead length (note 2) | 1 | ||
| DC Power Dissipation @ TA = 25°C | PD | 0.5 | W | FR-4 board, Littelfuse minimum recommended footprint (note 3) | 1 | ||
| Forward Surge Current | IFSM | 40 | A | TA = 25°C, for uni-directional (note 4: 1/2 sine wave, PW = 8.3 ms) | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Breakdown Voltage | VBR | 189 | 199 | 209 | V | @ IT = 1 mA (note 7), TA = 25°C | 3 |
| Maximum Reverse Leakage Current | IR | 2.5 | µA | @ VRWM = 170 V | 3 | ||
| Forward Voltage | VF | 3.5 | V | @ IF = 30 A, all types (note 5) | 2 | ||
| Clamping Voltage | VC | 275 | V | @ IPP = 1.5 A (note 8: surge waveform per Figure 2) | 3 | ||
| Junction Capacitance | C | 112 | pF | Bias voltage = 0 V, F = 1.0 MHz, TJ = 25°C (note 9) | 3 | ||
| Working Peak Reverse Voltage | VRWM | 170 | V | Note 6: should be equal to or greater than DC or continuous peak operating voltage | 3 | ||
| Thermal Resistance from Junction-to-Lead | RθJL | 50 | °C/W | Measured zero lead length, 1 in square copper pad, FR-4 (note 2) | 1 | ||
| Thermal Resistance from Junction-to-Ambient | RθJA | 250 | °C/W | FR-4 board, minimum recommended footprint (note 3) | 1 | ||
| DC Power Derating above 75°C | PD | 20 | mW/°C | Derate above TL = 75°C | 1 | ||
| DC Power Derating above 25°C | PD | 4 | mW/°C | Derate above TA = 25°C | 1 |
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:
SZ1SMA170AT3G - Footprint:
Diode_SMD:D_SMA - 3D model: DO-214AC(SMA) (KiCad packages3D, STEP)
- 3D model files:
sz1sma170at3g-etched.step/sz1sma170at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1sma170at3g.step/sz1sma170at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (7 pp, sha256
2dcbd1b5c6bf6a05, 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).