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JSMD1210-450L
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Shenzhen Jinkaisheng Elec Resettable Fuses, 1210. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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JSMD1210-450L
Shenzhen Jinkaisheng Elec · Resettable Fuses · 1210
JSMD1210-450L from Shenzhen Jinkaisheng Elec, in a 1210. 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 | 1 | passive | Terminal 1 of the non-polarized resettable PTC, rated 12.0 V dc max, 50.0 A max fault current, 4.5 A hold and 9.0 A trip at 25°C. |
| 2 | 2 | passive | Terminal 2 of the non-polarized resettable PTC, interchangeable with terminal 1, with 0.001 Ω min and 0.013 Ω max resistance (Ri min / R1max). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Jinkaisheng Elec |
| Package | 1210 |
| 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 |
|---|---|---|---|---|---|---|---|
| Maximum operating voltage (rated voltage, 12 V model) | V max | 12 | V dc | Maximum operating voltage the device can withstand without damage at rated current (Imax) | 1 | ||
| Maximum fault current the device can withstand (12 V model) | I max | 50 | A | Maximum fault current the device can withstand without damage at rated voltage (Vmax) | 1 | ||
| Hold current at 25°C still air | I hold | 4.5 | A | 25°C still air; maximum current the device will not trip | 1 | ||
| Trip current at 25°C still air | I trip | 9 | A | 25°C still air; minimum current at which the device will always trip | 1 | ||
| Power dissipation in tripped state | Pd | 1.4 | W | Tripped state, 25°C still air, at rated voltage | 1 | ||
| Maximum time to trip | 2 | s | At 22.5 A fault current | 1 | |||
| Minimum device resistance prior to tripping | Ri min | 0.001 | Ω | Prior to tripping at 25°C | 1 | ||
| Maximum device resistance measured one hour post reflow | R1max | 0.013 | Ω | Measured one hour post reflow | 1 | ||
| Resistance change, passive aging | -5 | 5 | % | +85°C, 1000 hrs; ±5% typical | 1 | ||
| Resistance change, humidity aging | -5 | 5 | % | +85°C, 85% R.H., 168 hours; ±5% typical | 1 | ||
| Resistance change, thermal shock | -33 | 33 | % | +85°C to -40°C, 20 times; ±33% typical | 1 | ||
| Ambient operating temperature | -40 | 85 | °C | Ambient operating conditions | 1 | ||
| Maximum surface temperature in tripped state | 125 | °C | Device in the tripped state, 25°C still air | 1 | |||
| Recommended hold current at ambient -40°C | 6.66 | A | Recommended hold current at ambient temperature -40°C | 2 | |||
| Recommended hold current at ambient -20°C | 6 | A | Recommended hold current at ambient temperature -20°C | 2 | |||
| Recommended hold current at ambient 0°C | 5.22 | A | Recommended hold current at ambient temperature 0°C | 2 | |||
| Recommended hold current at ambient 25°C | 4.5 | A | Recommended hold current at ambient temperature 25°C | 2 | |||
| Recommended hold current at ambient 40°C | 3.96 | A | Recommended hold current at ambient temperature 40°C | 2 | |||
| Recommended hold current at ambient 50°C | 3.48 | A | Recommended hold current at ambient temperature 50°C | 2 | |||
| Recommended hold current at ambient 60°C | 3.17 | A | Recommended hold current at ambient temperature 60°C | 2 | |||
| Recommended hold current at ambient 70°C | 2.76 | A | Recommended hold current at ambient temperature 70°C | 2 | |||
| Recommended hold current at ambient 85°C | 2.16 | A | Recommended hold current at ambient temperature 85°C | 2 | |||
| Storage temperature | 0 | 35 | °C | Storage condition | 3 | ||
| Storage relative humidity | 70 | %RH | Storage condition | 3 |
CAD (KiCad official)
- Symbol:
JSMD1210-450L - Footprint:
Fuse:Fuse_1210_3225Metric - 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files:
jsmd1210-450l-etched.step/jsmd1210-450l-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);jsmd1210-450l.step/jsmd1210-450l.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shenzhen Jinkaisheng Elec datasheet (7 pp, sha256
685a02ccb2d01eb0, retrieved 2026-10-15, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).
# JSMD1210-450L
**Shenzhen Jinkaisheng Elec** · Resettable Fuses · 1210
JSMD1210-450L from Shenzhen Jinkaisheng Elec, in a 1210. 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 | 1 | passive | Terminal 1 of the non-polarized resettable PTC, rated 12.0 V dc max, 50.0 A max fault current, 4.5 A hold and 9.0 A trip at 25°C. |
| 2 | 2 | passive | Terminal 2 of the non-polarized resettable PTC, interchangeable with terminal 1, with 0.001 Ω min and 0.013 Ω max resistance (Ri min / R1max). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shenzhen Jinkaisheng Elec |
| Package | 1210 |
| 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 |
|---|---|---|---|---|---|---|---|
| Maximum operating voltage (rated voltage, 12 V model) | V max | | | 12 | V dc | Maximum operating voltage the device can withstand without damage at rated current (Imax) | 1 |
| Maximum fault current the device can withstand (12 V model) | I max | | | 50 | A | Maximum fault current the device can withstand without damage at rated voltage (Vmax) | 1 |
| Hold current at 25°C still air | I hold | | | 4.5 | A | 25°C still air; maximum current the device will not trip | 1 |
| Trip current at 25°C still air | I trip | 9 | | | A | 25°C still air; minimum current at which the device will always trip | 1 |
| Power dissipation in tripped state | Pd | | 1.4 | | W | Tripped state, 25°C still air, at rated voltage | 1 |
| Maximum time to trip | | | | 2 | s | At 22.5 A fault current | 1 |
| Minimum device resistance prior to tripping | Ri min | 0.001 | | | Ω | Prior to tripping at 25°C | 1 |
| Maximum device resistance measured one hour post reflow | R1max | | | 0.013 | Ω | Measured one hour post reflow | 1 |
| Resistance change, passive aging | | -5 | | 5 | % | +85°C, 1000 hrs; ±5% typical | 1 |
| Resistance change, humidity aging | | -5 | | 5 | % | +85°C, 85% R.H., 168 hours; ±5% typical | 1 |
| Resistance change, thermal shock | | -33 | | 33 | % | +85°C to -40°C, 20 times; ±33% typical | 1 |
| Ambient operating temperature | | -40 | | 85 | °C | Ambient operating conditions | 1 |
| Maximum surface temperature in tripped state | | | | 125 | °C | Device in the tripped state, 25°C still air | 1 |
| Recommended hold current at ambient -40°C | | | | 6.66 | A | Recommended hold current at ambient temperature -40°C | 2 |
| Recommended hold current at ambient -20°C | | | | 6 | A | Recommended hold current at ambient temperature -20°C | 2 |
| Recommended hold current at ambient 0°C | | | | 5.22 | A | Recommended hold current at ambient temperature 0°C | 2 |
| Recommended hold current at ambient 25°C | | | | 4.5 | A | Recommended hold current at ambient temperature 25°C | 2 |
| Recommended hold current at ambient 40°C | | | | 3.96 | A | Recommended hold current at ambient temperature 40°C | 2 |
| Recommended hold current at ambient 50°C | | | | 3.48 | A | Recommended hold current at ambient temperature 50°C | 2 |
| Recommended hold current at ambient 60°C | | | | 3.17 | A | Recommended hold current at ambient temperature 60°C | 2 |
| Recommended hold current at ambient 70°C | | | | 2.76 | A | Recommended hold current at ambient temperature 70°C | 2 |
| Recommended hold current at ambient 85°C | | | | 2.16 | A | Recommended hold current at ambient temperature 85°C | 2 |
| Storage temperature | | 0 | | 35 | °C | Storage condition | 3 |
| Storage relative humidity | | | | 70 | %RH | Storage condition | 3 |
## CAD (KiCad official)
- Symbol: `JSMD1210-450L`
- Footprint: `Fuse:Fuse_1210_3225Metric`
- 3D model: 1210 (KiCad packages3D, STEP)
- 3D model files: `jsmd1210-450l-etched.step` / `jsmd1210-450l-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `jsmd1210-450l.step` / `jsmd1210-450l.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Shenzhen Jinkaisheng Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757195356671631360) (7 pp, sha256 `685a02ccb2d01eb0`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/jsmd1210-450l-datasheet.pdf)