component
SZ1.5SMC27AT3G
Public Made by Adomby adom
Littelfuse ESD And Surge Protection (TVS/ESD), SMC(DO-214AB). Unpolarised two-terminal part: the datasheet prints no pin numbers, so pins 1 and 2 follow the library convention, KiCad symbol/footprint/3D.
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SZ1.5SMC27AT3G
Littelfuse · ESD And Surge Protection (TVS/ESD) · SMC(DO-214AB)
SZ1.5SMC27AT3G from Littelfuse, in a SMC(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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMC(DO-214AB) |
| 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 (min) | VBR | 25.7 | 27 | 28.4 | V | @ IT = 1 mA (Note 7); TA = 25°C | 3 |
| Maximum Reverse Leakage Current | IR | 5 | µA | @ VRWM = 23.1 V | 3 | ||
| Maximum Clamp Voltage | VC | 37.5 | V | @ IPP = 40 A (Note 8) | 3 | ||
| Maximum Reverse Peak Pulse Current | IPP | 40 | A | Note 8 | 3 | ||
| Forward Voltage | VF | 3.5 | V | TA = 25°C unless otherwise noted; @ IF = 100 A (Note 5) | 2 | ||
| Peak Power Dissipation | PPK | 1500 | W | TL = 25°C, pulse width 1 ms (Note 1) | 1 | ||
| DC Power Dissipation (lead) | PD | 4 | W | @ TL = 75°C, measured zero lead length (Note 2) | 1 | ||
| DC Power Dissipation (ambient) | PD | 0.75 | W | @ TA = 25°C (Note 3) | 1 | ||
| Forward Surge Current | IFSM | 200 | A | @ TA = 25°C; 1/2 sine wave, PW = 8.3 ms (Note 4) | 1 | ||
| Operating and Storage Temperature Range | TJ, Tstg | -65 | 150 | °C | 1 | ||
| Working Peak Reverse Voltage | VRWM | 23.1 | V | 3 | |||
| Temperature Coefficient of VBR | 0.096 | %/°C | 3 | ||||
| DC Power Derating Above 75°C (lead) | PD | 54.6 | mW/°C | Derate above TL = 75°C | 1 | ||
| DC Power Derating Above 25°C (ambient) | PD | 6.1 | mW/°C | Derate above TA = 25°C | 1 | ||
| Thermal Resistance, Junction-to-Lead | RθJL | 18.3 | °C/W | 1 | |||
| Thermal Resistance, Junction-to-Ambient | RθJA | 165 | °C/W | 1 |
CAD (KiCad official)
- Symbol:
SZ1.5SMC27AT3G - Footprint:
Diode_SMD:D_SMC - 3D model: SMC(DO-214AB) (KiCad packages3D, STEP)
- 3D model files:
sz1-5smc27at3g-etched.step/sz1-5smc27at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1-5smc27at3g.step/sz1-5smc27at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (5 pp, sha256
171f62f7da65398d, retrieved 2026-10-16, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins, primarycathode-band convention(convention), consensusoff(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).
# SZ1.5SMC27AT3G
**Littelfuse** · ESD And Surge Protection (TVS/ESD) · SMC(DO-214AB)
SZ1.5SMC27AT3G from Littelfuse, in a SMC(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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | SMC(DO-214AB) |
| 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 (min) | VBR | 25.7 | 27 | 28.4 | V | @ IT = 1 mA (Note 7); TA = 25°C | 3 |
| Maximum Reverse Leakage Current | IR | | | 5 | µA | @ VRWM = 23.1 V | 3 |
| Maximum Clamp Voltage | VC | | | 37.5 | V | @ IPP = 40 A (Note 8) | 3 |
| Maximum Reverse Peak Pulse Current | IPP | | | 40 | A | Note 8 | 3 |
| Forward Voltage | VF | | | 3.5 | V | TA = 25°C unless otherwise noted; @ IF = 100 A (Note 5) | 2 |
| Peak Power Dissipation | PPK | | | 1500 | W | TL = 25°C, pulse width 1 ms (Note 1) | 1 |
| DC Power Dissipation (lead) | PD | | | 4 | W | @ TL = 75°C, measured zero lead length (Note 2) | 1 |
| DC Power Dissipation (ambient) | PD | | | 0.75 | W | @ TA = 25°C (Note 3) | 1 |
| Forward Surge Current | IFSM | | | 200 | A | @ TA = 25°C; 1/2 sine wave, PW = 8.3 ms (Note 4) | 1 |
| Operating and Storage Temperature Range | TJ, Tstg | -65 | | 150 | °C | | 1 |
| Working Peak Reverse Voltage | VRWM | | 23.1 | | V | | 3 |
| Temperature Coefficient of VBR | | | 0.096 | | %/°C | | 3 |
| DC Power Derating Above 75°C (lead) | PD | | 54.6 | | mW/°C | Derate above TL = 75°C | 1 |
| DC Power Derating Above 25°C (ambient) | PD | | 6.1 | | mW/°C | Derate above TA = 25°C | 1 |
| Thermal Resistance, Junction-to-Lead | RθJL | | 18.3 | | °C/W | | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA | | 165 | | °C/W | | 1 |
## CAD (KiCad official)
- Symbol: `SZ1.5SMC27AT3G`
- Footprint: `Diode_SMD:D_SMC`
- 3D model: SMC(DO-214AB) (KiCad packages3D, STEP)
- 3D model files: `sz1-5smc27at3g-etched.step` / `sz1-5smc27at3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sz1-5smc27at3g.step` / `sz1-5smc27at3g.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588903844033515521) (5 pp, sha256 `171f62f7da65398d`, retrieved 2026-10-16, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/sz1-5smc27at3g-datasheet.pdf)