# AP3125AEKTR-G1

**Diodes Incorporated** · AC-DC Controllers & Regulators · SOT-26

AP3125AEKTR-G1 from Diodes Incorporated, in a SOT-26. 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 | GND | power_in | Signal ground and current return for the driver and control circuits. |
| 2 | FB | input | Feedback input connected directly to the opto-coupler; FB above 4.5V for about 70ms triggers protection, and FB below 1.55V stops the drive pulses. |
| 3 | CTRL | input | Latch trigger input that latches on a voltage below 1V or above 3V; leave open if unused, and its sourcing current must be limited below 5mA. |
| 4 | SENSE | input | Current sense input with a maximum SENSE voltage of 0.95V typical and 250ns leading-edge blanking; negative undershoot greater than -0.3V may damage the pin, so an RC filter or series resistor is recommended. |
| 5 | VCC | power_in | Supply voltage for the driver and control circuits, with recommended operating range 10V to 25V, UVLO turn-on at 16V typical, turn-off at 7.6V typical, and OVP at 28.5V typical. |
| 6 | GATE | output | Gate driver output with 13V typical clamping voltage and at least 8V high level at IO=20mA and VCC=12V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-26 |
| Category | Power Supply Chip |
| Pins | 6 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Power Supply Voltage | VCC |  |  | 30 | V |  | 4 |
| Gate Output Current | IO |  |  | 350 | mA |  | 4 |
| Input Voltage to FB, SENSE, CTRL | VFB, VSENSE, VCTRL | -0.3 |  | 7 | V |  | 4 |
| Thermal Resistance (Junction to Ambient) | θJA |  |  | 250 | °C/W |  | 4 |
| Power Dissipation at TA < +25°C | PD |  |  | 500 | mW | TA < +25°C | 4 |
| Operating Junction Temperature | TJ | -40 |  | 150 | °C |  | 4 |
| Storage Temperature Range | TSTG |  |  | 150 | °C |  | 4 |
| ESD (Human Body Model) |  |  |  | 3000 | V |  | 4 |
| ESD (Machine Model) |  |  |  | 300 | V |  | 4 |
| Supply Voltage | VCC | 10 |  | 25 | V |  | 4 |
| Startup Current | ISTARTUP |  | 1 | 10 | μA |  | 5 |
| Operating Supply Current | ICC | 0.5 | 0.7 | 1 | mA | VFB=0V, CL=1nF | 5 |
| Operating Supply Current | ICC | 0.6 | 1.2 | 2 | mA | VFB=3V, CL=0nF | 5 |
| UVLO (on) |  | 14.5 | 15.8 | 16.5 | V |  | 5 |
| VCC Maintain |  | 8.6 | 9.1 | 9.6 | V |  | 5 |
| UVLO (off) |  | 7.1 | 7.6 | 8.1 | V |  | 5 |
| VCC OVP |  | 27 | 28.5 | 30 | V |  | 5 |
| VCC Clamp |  | 31 | 34 |  | V | ICC=5mA | 5 |
| Maximum Duty Cycle |  | 70 | 75 | 80 | % |  | 5 |
| Oscillation Frequency |  | 60 | 65 | 70 | kHz |  | 5 |
| Green Mode Frequency |  | 20 |  | 30 | kHz |  | 5 |
| Frequency Temperature Stability |  |  |  | 5 | % | -20°C to 125°C (Note 5) | 5 |
| Frequency Voltage Stability |  |  |  | 3 | % | VCC=12V to 30V | 5 |
| Frequency Dithering |  | -4 | 6 | 8 | % |  | 5 |
| Maximum SENSE Voltage | VCS | 0.9 | 0.95 | 1 | V | VFB=4.5V | 5 |
| FOCP Voltage |  | 1.5 | 1.7 | 1.9 | V |  | 5 |
| LEB Time of SENSE |  | 150 | 250 | 350 | ns |  | 5 |
| Soft-start Time |  | 3 | 5 | 8 | ms |  | 5 |
| Ratio of Input Voltage to Current Sense Voltage |  | 2.5 | 3 | 3.5 | V/V |  | 5 |
| Input Impedance |  | 12 | 15 | 18 | kΩ |  | 5 |
| Source Current |  | -0.2 | -0.27 | -0.34 | mA | VFB=0V | 5 |
| Input Voltage for Zero Duty |  | 1.3 | 1.55 | 1.8 | V |  | 5 |
| Output Low Level |  |  |  | 1 | V | IO=20mA, VCC=12V | 5 |
| Output High Level |  | 8 |  |  | V | IO=20mA, VCC=12V | 5 |
| Output Clamping Voltage |  | 11 | 13 | 15 | V |  | 5 |
| Rising Time |  |  | 150 | 250 | ns | CL=1nF, VCC=13V | 5 |
| Falling Time |  |  | 50 | 100 | ns | CL=1nF, VCC=13V | 5 |
| Source Current (CTRL pin) |  | 90 | 100 | 110 | μA |  | 6 |
| Low Threshold Trigger for Latch |  | 0.94 | 1 | 1.06 | V |  | 6 |
| High Threshold Trigger for Latch |  | 2.85 | 3 | 3.15 | V |  | 6 |
| Pull-up Current |  |  |  | 2 | mA |  | 6 |

## CAD (KiCad official)

- Symbol: `AP3125AEKTR-G1`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-26, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.45 mm tall, datasheet A, max). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
- 3D model files: `ap3125aektr-g1-etched.step` / `ap3125aektr-g1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ap3125aektr-g1.step` / `ap3125aektr-g1.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/AP3125AEKTR-G1.pdf) (13 pp, sha256 `5c4b09361eff7f55`, retrieved 2026-11-12, tier: manufacturer)
- **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/ap3125aektr-g1-datasheet.pdf)