component
SE431D-LF
Public Made by Adomby adom
Seaward Elec Voltage References, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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SE431D-LF
Seaward Elec · Voltage References · SOT-23
SE431D-LF from Seaward Elec, in a SOT-23. 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 | Ref | input | Reference input that sets the output voltage through an external resistor divider, with VREF typically 2495 mV and reference current limited to 10 mA absolute maximum. |
| 2 | Cathode | passive | Shunt regulator cathode (output) that can be set from VREF to 36 V recommended (40 V absolute maximum) and regulates with 0.3 to 100 mA cathode current (150 mA absolute maximum). |
| 3 | Anode | power_in | Anode terminal, the reference point (normally ground) for all cathode voltage values in the datasheet. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Seaward Elec |
| Package | SOT-23 |
| Category | Power Management ICs |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reference voltage (0.5% grade) | VREF | 2483 | 2495 | 2507 | mV | VKA = VREF, IKA = 10mA | 3 |
| Reference voltage (1% grade) | VREF | 2470 | 2495 | 2520 | mV | VKA = VREF, IKA = 10mA | 3 |
| Reference voltage (2% grade) | VREF | 2445 | 2495 | 2545 | mV | VKA = VREF, IKA = 10mA | 3 |
| Deviation of reference voltage over full temperature range | VI(dev) | 8 | 17 | mV | VKA = VREF, IKA = 10mA, TA = 0°C to 125°C | 3 | |
| Ratio of change in reference voltage to change in cathode voltage | ΔVREF/ΔVKA | 0.2 | 2.7 | mV/V | IKA = 3mA, ΔVKA = 10 V - VREF | 3 | |
| Reference current | IREF | 0.3 | 4 | µA | IKA = 10mA, R1=10kΩ, R2 = ∞ | 3 | |
| Deviation of reference current over full temperature range | II(dev) | 0.13 | 4 | µA | IKA = 10mA, R1=10kΩ, R2 = ∞, TA = 0°C to 125°C | 3 | |
| Minimum cathode current for regulation | IMIN | 0.15 | 0.3 | mA | VKA = VREF | 3 | |
| Off-state cathode current | IOFF | 0.4 | 1 | µA | VKA = 36 V, VREF = 0 | 3 | |
| Dynamic impedance | ZKA | 0.08 | 0.7 | Ω | IKA = 1mA to 100mA, VKA = VREF, f ≤ 1kHZ | 3 | |
| Cathode voltage (recommended) | VKA | 36 | V | Minimum printed as VREF | 3 | ||
| Cathode current for regulation (recommended) | IK | 0.3 | 100 | mA | for regulation | 3 | |
| Cathode voltage (absolute maximum) | VKA | 40 | V | Voltage with respect to anode terminal | 3 | ||
| Continuous cathode current | IKA | 150 | mA | 3 | |||
| Reference current (absolute maximum) | IREF | 10 | mA | 3 | |||
| Operating junction temperature range | TJ | -40 | 125 | °C | 3 | ||
| Storage temperature range | TSTG | -65 | 150 | °C | 3 | ||
| Lead temperature (soldering) | TLEAD | 260 | °C | 10 seconds | 3 | ||
| Thermal resistance junction-to-ambient (SOT-23-3) | θJA | 230 | °C/W | SOT-23-3; mounted onboard, still air, 1 W applied | 5 | ||
| Package power rating at TA=25°C (SOT-23-3) | PD | 435 | mW | SOT-23-3, TA=25°C | 5 | ||
| Package power rating at TA=50°C (SOT-23-3) | PD | 326 | mW | SOT-23-3, TA=50°C | 5 | ||
| Package power rating at TA=70°C (SOT-23-3) | PD | 239 | mW | SOT-23-3, TA=70°C | 5 |
CAD (KiCad official)
- Symbol:
SE431D-LF - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
se431d-lf-etched.step/se431d-lf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);se431d-lf.step/se431d-lf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Seaward Elec datasheet (8 pp, sha256
0b369c4317eb861a, retrieved 2026-11-05, 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).
# SE431D-LF
**Seaward Elec** · Voltage References · SOT-23
SE431D-LF from Seaward Elec, in a SOT-23. 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 | Ref | input | Reference input that sets the output voltage through an external resistor divider, with VREF typically 2495 mV and reference current limited to 10 mA absolute maximum. |
| 2 | Cathode | passive | Shunt regulator cathode (output) that can be set from VREF to 36 V recommended (40 V absolute maximum) and regulates with 0.3 to 100 mA cathode current (150 mA absolute maximum). |
| 3 | Anode | power_in | Anode terminal, the reference point (normally ground) for all cathode voltage values in the datasheet. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Seaward Elec |
| Package | SOT-23 |
| Category | Power Management ICs |
| Pins | 3 |
## Electrical characteristics
Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reference voltage (0.5% grade) | VREF | 2483 | 2495 | 2507 | mV | VKA = VREF, IKA = 10mA | 3 |
| Reference voltage (1% grade) | VREF | 2470 | 2495 | 2520 | mV | VKA = VREF, IKA = 10mA | 3 |
| Reference voltage (2% grade) | VREF | 2445 | 2495 | 2545 | mV | VKA = VREF, IKA = 10mA | 3 |
| Deviation of reference voltage over full temperature range | VI(dev) | | 8 | 17 | mV | VKA = VREF, IKA = 10mA, TA = 0°C to 125°C | 3 |
| Ratio of change in reference voltage to change in cathode voltage | ΔVREF/ΔVKA | | 0.2 | 2.7 | mV/V | IKA = 3mA, ΔVKA = 10 V - VREF | 3 |
| Reference current | IREF | | 0.3 | 4 | µA | IKA = 10mA, R1=10kΩ, R2 = ∞ | 3 |
| Deviation of reference current over full temperature range | II(dev) | | 0.13 | 4 | µA | IKA = 10mA, R1=10kΩ, R2 = ∞, TA = 0°C to 125°C | 3 |
| Minimum cathode current for regulation | IMIN | | 0.15 | 0.3 | mA | VKA = VREF | 3 |
| Off-state cathode current | IOFF | | 0.4 | 1 | µA | VKA = 36 V, VREF = 0 | 3 |
| Dynamic impedance | ZKA | | 0.08 | 0.7 | Ω | IKA = 1mA to 100mA, VKA = VREF, f ≤ 1kHZ | 3 |
| Cathode voltage (recommended) | VKA | | | 36 | V | Minimum printed as VREF | 3 |
| Cathode current for regulation (recommended) | IK | 0.3 | | 100 | mA | for regulation | 3 |
| Cathode voltage (absolute maximum) | VKA | | | 40 | V | Voltage with respect to anode terminal | 3 |
| Continuous cathode current | IKA | | | 150 | mA | | 3 |
| Reference current (absolute maximum) | IREF | | | 10 | mA | | 3 |
| Operating junction temperature range | TJ | -40 | | 125 | °C | | 3 |
| Storage temperature range | TSTG | -65 | | 150 | °C | | 3 |
| Lead temperature (soldering) | TLEAD | | | 260 | °C | 10 seconds | 3 |
| Thermal resistance junction-to-ambient (SOT-23-3) | θJA | | | 230 | °C/W | SOT-23-3; mounted onboard, still air, 1 W applied | 5 |
| Package power rating at TA=25°C (SOT-23-3) | PD | | | 435 | mW | SOT-23-3, TA=25°C | 5 |
| Package power rating at TA=50°C (SOT-23-3) | PD | | | 326 | mW | SOT-23-3, TA=50°C | 5 |
| Package power rating at TA=70°C (SOT-23-3) | PD | | | 239 | mW | SOT-23-3, TA=70°C | 5 |
## CAD (KiCad official)
- Symbol: `SE431D-LF`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `se431d-lf-etched.step` / `se431d-lf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `se431d-lf.step` / `se431d-lf.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Seaward Elec datasheet](docs/se431d-lf-datasheet.pdf) (8 pp, sha256 `0b369c4317eb861a`, retrieved 2026-11-05, 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/se431d-lf-datasheet.pdf)