component
CD431D-N3B-ARG
Public Made by Adomby adom
Changjing Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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CD431D-N3B-ARG
Changjing · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23
CD431D-N3B-ARG from Changjing, 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 | K | bidirectional | Cathode pin: shunt current / output voltage, with a recommended cathode current of 1.0 to 100 mA and a maximum cathode voltage of 40 V (absolute maximum, referenced to the anode). |
| 2 | R | input | Reference pin for the adjustable output voltage; it must be driven (it cannot be left floating) and its current IREF is limited to -0.05 to 10 mA. |
| 3 | A | power_in | Anode pin, normally grounded, and the reference terminal for all voltages on the device (the datasheet lists this pin as an output, O). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | Power Management (PMIC) |
| 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, 0.4% grade | VREF | 2.49 | 2.5 | 2.51 | V | VKA = VREF, IKA = 10mA | 7 |
| Deviation of reference voltage over full temperature range, TA = 0 to 70°C | ΔVREF | 4.5 | 8 | mV | VKA = VREF, IKA = 10mA, TA = 0 to 70°C | 7 | |
| Deviation of reference voltage over full temperature range, TA = -40 to 85°C | ΔVREF | 4.5 | 10 | mV | VKA = VREF, IKA = 10mA, TA = -40 to 85°C | 7 | |
| Deviation of reference voltage over full temperature range, TA = -40 to 125°C | ΔVREF | 4.5 | 16 | mV | VKA = VREF, IKA = 10mA, TA = -40 to 125°C | 7 | |
| Ratio of change in reference voltage to change in cathode voltage, ΔVKA = 10V to VREF | ΔVREF / ΔVKA | -1 | -2.7 | mV / V | IKA = 10mA, ΔVKA = 10V to VREF | 7 | |
| Ratio of change in reference voltage to change in cathode voltage, ΔVKA = 36 to 10V | ΔVREF / ΔVKA | -0.5 | -2 | mV / V | IKA = 10mA, ΔVKA = 36 to 10V | 7 | |
| Reference current | IREF | 0.7 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 7 | |
| Deviation of reference current over full temperature range | ΔIREF | 0.4 | 1.2 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞, TA = -40 to 125°C | 7 | |
| Minimum cathode current for regulation | IKA MIN | 0.4 | 1 | mA | VKA = VREF | 7 | |
| Off-state cathode current | IKA OFF | 0.05 | 1 | µA | VKA = 36V, VREF = 0V | 7 | |
| Dynamic impedance | ZKA | 0.15 | 0.5 | Ω | VKA = VREF, IKA = 1 to 100mA, f ≤ 1.0kHz | 7 | |
| Cathode voltage | VKA | 40 | V | TA = 25°C | 6 | ||
| Cathode current range (continuous) | IKA | -100 | 150 | mA | TA = 25°C | 6 | |
| Reference input current range | IREF | -0.05 | 10 | mA | TA = 25°C | 6 | |
| Maximum junction temperature | TJ Max | 150 | °C | TA = 25°C | 6 | ||
| Storage temperature | Tstg | -65 | 150 | °C | TA = 25°C | 6 | |
| Cathode voltage | VKA | 36 | V | 6 | |||
| Cathode current | IKA | 1 | 100 | mA | 6 | ||
| Operating ambient temperature | TA | -40 | 125 | °C | 6 | ||
| Junction-to-ambient thermal resistance, SOT-23 | RΘJA | 416.7 | °C/W | Still air, TA = 25°C, 1 in² FR-4 board, 2 oz copper | 7 | ||
| Junction-to-case thermal resistance, SOT-23 | RΘJC | 139.4 | °C/W | 7 | |||
| Reference maximum power dissipation for continuous operation, SOT-23 | PD Ref | 0.3 | W | Still air, TA = 25°C, 1 in² FR-4 board, 2 oz copper | 7 |
CAD (KiCad official)
- Symbol:
CD431D-N3B-ARG - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
cd431d-n3b-arg-etched.step/cd431d-n3b-arg-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cd431d-n3b-arg.step/cd431d-n3b-arg.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Changjing datasheet (24 pp, sha256
b75990ca44bd0e7d, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).
# CD431D-N3B-ARG
**Changjing** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23
CD431D-N3B-ARG from Changjing, 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 | K | bidirectional | Cathode pin: shunt current / output voltage, with a recommended cathode current of 1.0 to 100 mA and a maximum cathode voltage of 40 V (absolute maximum, referenced to the anode). |
| 2 | R | input | Reference pin for the adjustable output voltage; it must be driven (it cannot be left floating) and its current IREF is limited to -0.05 to 10 mA. |
| 3 | A | power_in | Anode pin, normally grounded, and the reference terminal for all voltages on the device (the datasheet lists this pin as an output, O). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | Power Management (PMIC) |
| 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, 0.4% grade | VREF | 2.49 | 2.5 | 2.51 | V | VKA = VREF, IKA = 10mA | 7 |
| Deviation of reference voltage over full temperature range, TA = 0 to 70°C | ΔVREF | | 4.5 | 8 | mV | VKA = VREF, IKA = 10mA, TA = 0 to 70°C | 7 |
| Deviation of reference voltage over full temperature range, TA = -40 to 85°C | ΔVREF | | 4.5 | 10 | mV | VKA = VREF, IKA = 10mA, TA = -40 to 85°C | 7 |
| Deviation of reference voltage over full temperature range, TA = -40 to 125°C | ΔVREF | | 4.5 | 16 | mV | VKA = VREF, IKA = 10mA, TA = -40 to 125°C | 7 |
| Ratio of change in reference voltage to change in cathode voltage, ΔVKA = 10V to VREF | ΔVREF / ΔVKA | | -1 | -2.7 | mV / V | IKA = 10mA, ΔVKA = 10V to VREF | 7 |
| Ratio of change in reference voltage to change in cathode voltage, ΔVKA = 36 to 10V | ΔVREF / ΔVKA | | -0.5 | -2 | mV / V | IKA = 10mA, ΔVKA = 36 to 10V | 7 |
| Reference current | IREF | | 0.7 | 4 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞ | 7 |
| Deviation of reference current over full temperature range | ΔIREF | | 0.4 | 1.2 | µA | IKA = 10mA, R1 = 10kΩ, R2 = ∞, TA = -40 to 125°C | 7 |
| Minimum cathode current for regulation | IKA MIN | | 0.4 | 1 | mA | VKA = VREF | 7 |
| Off-state cathode current | IKA OFF | | 0.05 | 1 | µA | VKA = 36V, VREF = 0V | 7 |
| Dynamic impedance | ZKA | | 0.15 | 0.5 | Ω | VKA = VREF, IKA = 1 to 100mA, f ≤ 1.0kHz | 7 |
| Cathode voltage | VKA | | | 40 | V | TA = 25°C | 6 |
| Cathode current range (continuous) | IKA | -100 | | 150 | mA | TA = 25°C | 6 |
| Reference input current range | IREF | -0.05 | | 10 | mA | TA = 25°C | 6 |
| Maximum junction temperature | TJ Max | | | 150 | °C | TA = 25°C | 6 |
| Storage temperature | Tstg | -65 | | 150 | °C | TA = 25°C | 6 |
| Cathode voltage | VKA | | | 36 | V | | 6 |
| Cathode current | IKA | 1 | | 100 | mA | | 6 |
| Operating ambient temperature | TA | -40 | | 125 | °C | | 6 |
| Junction-to-ambient thermal resistance, SOT-23 | RΘJA | | 416.7 | | °C/W | Still air, TA = 25°C, 1 in² FR-4 board, 2 oz copper | 7 |
| Junction-to-case thermal resistance, SOT-23 | RΘJC | | 139.4 | | °C/W | | 7 |
| Reference maximum power dissipation for continuous operation, SOT-23 | PD Ref | | 0.3 | | W | Still air, TA = 25°C, 1 in² FR-4 board, 2 oz copper | 7 |
## CAD (KiCad official)
- Symbol: `CD431D-N3B-ARG`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `cd431d-n3b-arg-etched.step` / `cd431d-n3b-arg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd431d-n3b-arg.step` / `cd431d-n3b-arg.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8602958562804965376) (24 pp, sha256 `b75990ca44bd0e7d`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-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/cd431d-n3b-arg-datasheet.pdf)