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SZ1SMC33AT3G
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Littelfuse TVS, DO-214AB. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SZ1SMC33AT3G
Littelfuse · TVS · DO-214AB
SZ1SMC33AT3G from Littelfuse, in a DO-214AB. 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 TVS diode, marked by the color band, connected to the protected positive line with VRWM of 33 V and VBR of 36.7 V min to 40.6 V max at 1 mA. |
| 2 | Anode | passive | Anode of the unidirectional TVS diode, connected to ground or the return side of the protected line, clamping at a maximum of 53.3 V at 28.1 A peak pulse current. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | DO-214AB |
| 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 |
|---|---|---|---|---|---|---|---|
| Working Peak Reverse Voltage | VRWM | 33 | V | 2 | |||
| Maximum Reverse Leakage Current | IR | 5 | µA | @ VRWM | 2 | ||
| Breakdown Voltage | VBR | 36.7 | 38.65 | 40.6 | V | @ IT = 1 mA, TA = 25°C | 2 |
| Clamping Voltage | VC | 53.3 | V | @ IPP = 28.1 A | 2 | ||
| Maximum Reverse Peak Pulse Current | IPP | 28.1 | A | 2 | |||
| Forward Voltage | VF | 3.5 | V | @ IF = 100 A | 2 | ||
| Peak Power Dissipation | PPK | 1500 | W | TL = 25°C, Pulse Width = 1 ms, 10 x 1000 µs non-repetitive | 1 | ||
| DC Power Dissipation (zero lead length) | PD | 4 | W | TL = 75°C, 1 in square copper pad, FR-4 board | 1 | ||
| DC Power Dissipation (footprint) | PD | 0.75 | W | TA = 25°C, FR-4 board, minimum recommended footprint | 1 | ||
| Forward Surge Current | IFSM | 200 | A | TA = 25°C, 1/2 sine wave, PW = 8.3 ms, 4 pulses per minute max | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Thermal Resistance Junction-to-Lead | RƟJL | 18.3 | °C/W | TL = 75°C, zero lead length | 1 | ||
| Thermal Resistance Junction-to-Ambient | RƟJA | 165 | °C/W | TA = 25°C, FR-4 board, minimum footprint | 1 | ||
| Derating above 75°C | 54.6 | mW/°C | Above 75°C, zero lead length | 1 | |||
| Derating above 25°C | 6.1 | mW/°C | Above 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 | Terminal Matte Tin-plated leads, Solderable per JESD22-B102 | 4 |
CAD (KiCad official)
- Symbol:
SZ1SMC33AT3G - Footprint:
Diode_SMD:D_SMC - 3D model: DO-214AB (KiCad packages3D, STEP)
- 3D model files:
sz1smc33at3g-etched.step/sz1smc33at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1smc33at3g.step/sz1smc33at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (5 pp, sha256
c5215d2a08f7ef32, retrieved 2026-10-27, 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).
# SZ1SMC33AT3G
**Littelfuse** · TVS · DO-214AB
SZ1SMC33AT3G from Littelfuse, in a DO-214AB. 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 TVS diode, marked by the color band, connected to the protected positive line with VRWM of 33 V and VBR of 36.7 V min to 40.6 V max at 1 mA. |
| 2 | Anode | passive | Anode of the unidirectional TVS diode, connected to ground or the return side of the protected line, clamping at a maximum of 53.3 V at 28.1 A peak pulse current. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | DO-214AB |
| 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 |
|---|---|---|---|---|---|---|---|
| Working Peak Reverse Voltage | VRWM | | 33 | | V | | 2 |
| Maximum Reverse Leakage Current | IR | | | 5 | µA | @ VRWM | 2 |
| Breakdown Voltage | VBR | 36.7 | 38.65 | 40.6 | V | @ IT = 1 mA, TA = 25°C | 2 |
| Clamping Voltage | VC | | | 53.3 | V | @ IPP = 28.1 A | 2 |
| Maximum Reverse Peak Pulse Current | IPP | | | 28.1 | A | | 2 |
| Forward Voltage | VF | | | 3.5 | V | @ IF = 100 A | 2 |
| Peak Power Dissipation | PPK | | | 1500 | W | TL = 25°C, Pulse Width = 1 ms, 10 x 1000 µs non-repetitive | 1 |
| DC Power Dissipation (zero lead length) | PD | | | 4 | W | TL = 75°C, 1 in square copper pad, FR-4 board | 1 |
| DC Power Dissipation (footprint) | PD | | | 0.75 | W | TA = 25°C, FR-4 board, minimum recommended footprint | 1 |
| Forward Surge Current | IFSM | | | 200 | A | TA = 25°C, 1/2 sine wave, PW = 8.3 ms, 4 pulses per minute max | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 1 |
| Thermal Resistance Junction-to-Lead | RƟJL | | 18.3 | | °C/W | TL = 75°C, zero lead length | 1 |
| Thermal Resistance Junction-to-Ambient | RƟJA | | 165 | | °C/W | TA = 25°C, FR-4 board, minimum footprint | 1 |
| Derating above 75°C | | | 54.6 | | mW/°C | Above 75°C, zero lead length | 1 |
| Derating above 25°C | | | 6.1 | | mW/°C | Above 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 | Terminal Matte Tin-plated leads, Solderable per JESD22-B102 | 4 |
## CAD (KiCad official)
- Symbol: `SZ1SMC33AT3G`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: DO-214AB (KiCad packages3D, STEP)
- 3D model files: `sz1smc33at3g-etched.step` / `sz1smc33at3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sz1smc33at3g.step` / `sz1smc33at3g.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Littelfuse datasheet](docs/sz1smc33at3g-datasheet.pdf) (5 pp, sha256 `c5215d2a08f7ef32`, retrieved 2026-10-27, 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/sz1smc33at3g-datasheet.pdf)