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SZ1SMA48AT3G
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Littelfuse ESD And Surge Protection (TVS/ESD), SMA. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SZ1SMA48AT3G
Littelfuse · ESD And Surge Protection (TVS/ESD) · SMA
SZ1SMA48AT3G from Littelfuse, in a 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, identified by the polarity band or notch; the SZ1SMA48AT3G is a uni-directional device with working peak reverse voltage VRWM of 48 V and breakdown voltage of 53.3 V to 58.9 V. |
| 2 | Anode | passive | Anode of the uni-directional TVS diode, which protects voltage-sensitive components from transients at a peak pulse power of 400 W (10 x 1000 µs). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | 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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 53.3 | 56.1 | 58.9 | V | @ IT = 1 mA (Note 7) | 3 |
| Maximum Reverse Leakage Current | IR | 2.5 | µA | @ VRWM | 3 | ||
| Maximum Reverse Peak Pulse Current | IPP | 5.2 | A | 3 | |||
| Clamping Voltage | VC | 77.4 | V | @ IPP 5.2 A (Note 8) | 3 | ||
| Junction Capacitance | C | 265 | pF | Bias voltage = 0 V, F = 1.0 MHz, TJ = 25°C (Note 9) | 3 | ||
| Working Peak Reverse Voltage | VRWM | 48 | V | Note 6 | 3 | ||
| Peak Power Dissipation | PPK | 400 | W | TL = 25°C, pulse width 1 ms (Note 1) | 1 | ||
| DC Power Dissipation | PD | 1 | W | DC, TL = 75°C, measured zero lead length (Note 2) | 1 | ||
| Derate Above 75°C | PD | 20 | mW/°C | Above TL = 75°C | 1 | ||
| Thermal Resistance Junction-to-Lead | RθJL | 50 | °C/W | Measured zero lead length (Note 2) | 1 | ||
| DC Power Dissipation | PD | 0.5 | W | TA = 25°C (Note 3) | 1 | ||
| Derate Above 25°C | PD | 4 | mW/°C | Above TA = 25°C | 1 | ||
| Thermal Resistance Junction-to-Ambient | RθJA | 250 | °C/W | FR-4 board, minimum recommended footprint (Note 3) | 1 | ||
| Forward Surge Current | IFSM | 40 | 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 |
CAD (KiCad official)
- Symbol:
SZ1SMA48AT3G - Footprint:
Diode_SMD:D_SMA - 3D model: SMA (KiCad packages3D, STEP)
- 3D model files:
sz1sma48at3g-etched.step/sz1sma48at3g-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sz1sma48at3g.step/sz1sma48at3g.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Littelfuse datasheet (5 pp, sha256
0efc269c31859c3d, retrieved 2026-10-26, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusoff(skipped (clean text read)), 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).
# SZ1SMA48AT3G
**Littelfuse** · ESD And Surge Protection (TVS/ESD) · SMA
SZ1SMA48AT3G from Littelfuse, in a 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, identified by the polarity band or notch; the SZ1SMA48AT3G is a uni-directional device with working peak reverse voltage VRWM of 48 V and breakdown voltage of 53.3 V to 58.9 V. |
| 2 | Anode | passive | Anode of the uni-directional TVS diode, which protects voltage-sensitive components from transients at a peak pulse power of 400 W (10 x 1000 µs). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | 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 |
|---|---|---|---|---|---|---|---|
| Breakdown Voltage | VBR | 53.3 | 56.1 | 58.9 | V | @ IT = 1 mA (Note 7) | 3 |
| Maximum Reverse Leakage Current | IR | | | 2.5 | µA | @ VRWM | 3 |
| Maximum Reverse Peak Pulse Current | IPP | | | 5.2 | A | | 3 |
| Clamping Voltage | VC | | 77.4 | | V | @ IPP 5.2 A (Note 8) | 3 |
| Junction Capacitance | C | | 265 | | pF | Bias voltage = 0 V, F = 1.0 MHz, TJ = 25°C (Note 9) | 3 |
| Working Peak Reverse Voltage | VRWM | | 48 | | V | Note 6 | 3 |
| Peak Power Dissipation | PPK | | | 400 | W | TL = 25°C, pulse width 1 ms (Note 1) | 1 |
| DC Power Dissipation | PD | | | 1 | W | DC, TL = 75°C, measured zero lead length (Note 2) | 1 |
| Derate Above 75°C | PD | | 20 | | mW/°C | Above TL = 75°C | 1 |
| Thermal Resistance Junction-to-Lead | RθJL | | 50 | | °C/W | Measured zero lead length (Note 2) | 1 |
| DC Power Dissipation | PD | | | 0.5 | W | TA = 25°C (Note 3) | 1 |
| Derate Above 25°C | PD | | 4 | | mW/°C | Above TA = 25°C | 1 |
| Thermal Resistance Junction-to-Ambient | RθJA | | 250 | | °C/W | FR-4 board, minimum recommended footprint (Note 3) | 1 |
| Forward Surge Current | IFSM | | | 40 | 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 |
## CAD (KiCad official)
- Symbol: `SZ1SMA48AT3G`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `sz1sma48at3g-etched.step` / `sz1sma48at3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sz1sma48at3g.step` / `sz1sma48at3g.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/8588939642766823424) (5 pp, sha256 `0efc269c31859c3d`, retrieved 2026-10-26, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), 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/sz1sma48at3g-datasheet.pdf)