component
SZ1.5SMC20AT3G
Public Made by Adomby adom
Littelfuse TVS, SMC. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SZ1.5SMC20AT3G
Littelfuse · TVS · SMC
SZ1.5SMC20AT3G from Littelfuse, in a SMC. 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 unidirectional 1500 W TVS diode, marked by the color band on the package; connects to the protected positive line (VRWM 17.1 V, VBR 19-21 V at 1 mA). |
| 2 | Anode | passive | Anode of the unidirectional 1500 W TVS diode, connects to the return/ground side of the protected line. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMC |
| Category | TVS/Fuse/Board Level 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 | 19 | 20 | 21 | V | @ IT = 1 mA | 2 |
| Reverse Leakage Current | IR | 5 | µA | @ VRWM | 2 | ||
| Working Peak Reverse Voltage | VRWM | 17.1 | V | 2 | |||
| Clamping Voltage | VC | 27.7 | V | @ IPP = 54 A | 2 | ||
| Forward Voltage | VF | 3.5 | V | @ IF = 100 A | 2 | ||
| Maximum Reverse Peak Pulse Current | IPP | 54 | A | 2 | |||
| Breakdown Voltage Temperature Coefficient | MVBR | 0.09 | %/°C | TYP. | 2 | ||
| Peak Power Dissipation | PPK | 1500 | W | TL = 25°C, Pulse Width = 1 ms | 1 | ||
| DC Power Dissipation (lead) | PD | 4 | W | TL = 75°C, zero lead length | 1 | ||
| DC Power Dissipation (ambient) | PD | 0.75 | W | TA = 25°C, FR-4 board | 1 | ||
| Forward Surge Current | IFSM | 200 | A | TA = 25°C, 1/2 sine wave, PW = 8.3 ms | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 18.3 | °C/W | 1 | |||
| Thermal Resistance Junction-to-Ambient | RθJA | 165 | °C/W | 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 | Terminal Matte Tin-plated leads, Solderable per JESD22-B102 | 4 |
CAD (KiCad official)
- Symbol:
SZ1.5SMC20AT3G - Footprint:
Diode_SMD:D_SMC - 3D model: SMC (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (5 pp, sha256
c2c04b53fefd210a, retrieved 2026-10-31, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).
# SZ1.5SMC20AT3G
**Littelfuse** · TVS · SMC
SZ1.5SMC20AT3G from Littelfuse, in a SMC. 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 unidirectional 1500 W TVS diode, marked by the color band on the package; connects to the protected positive line (VRWM 17.1 V, VBR 19-21 V at 1 mA). |
| 2 | Anode | passive | Anode of the unidirectional 1500 W TVS diode, connects to the return/ground side of the protected line. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMC |
| Category | TVS/Fuse/Board Level 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 | 19 | 20 | 21 | V | @ IT = 1 mA | 2 |
| Reverse Leakage Current | IR | | | 5 | µA | @ VRWM | 2 |
| Working Peak Reverse Voltage | VRWM | | | 17.1 | V | | 2 |
| Clamping Voltage | VC | | | 27.7 | V | @ IPP = 54 A | 2 |
| Forward Voltage | VF | | | 3.5 | V | @ IF = 100 A | 2 |
| Maximum Reverse Peak Pulse Current | IPP | | 54 | | A | | 2 |
| Breakdown Voltage Temperature Coefficient | MVBR | | 0.09 | | %/°C | TYP. | 2 |
| Peak Power Dissipation | PPK | | | 1500 | W | TL = 25°C, Pulse Width = 1 ms | 1 |
| DC Power Dissipation (lead) | PD | | | 4 | W | TL = 75°C, zero lead length | 1 |
| DC Power Dissipation (ambient) | PD | | | 0.75 | W | TA = 25°C, FR-4 board | 1 |
| Forward Surge Current | IFSM | | | 200 | A | TA = 25°C, 1/2 sine wave, PW = 8.3 ms | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 1 |
| Thermal Resistance Junction-to-Lead | RθJL | | 18.3 | | °C/W | | 1 |
| Thermal Resistance Junction-to-Ambient | RθJA | | 165 | | °C/W | | 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 | Terminal Matte Tin-plated leads, Solderable per JESD22-B102 | 4 |
## CAD (KiCad official)
- Symbol: `SZ1.5SMC20AT3G`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: SMC (KiCad packages3D, STEP)
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Littelfuse datasheet](docs/sz1-5smc20at3g-datasheet.pdf) (5 pp, sha256 `c2c04b53fefd210a`, retrieved 2026-10-31, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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](docs/sz1-5smc20at3g-datasheet.pdf)