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AP3781S-13
Public Made by Adomby adom
Diodes Incorporated AC-DC Controllers And Regulators, SO-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownAP3781S-13
Diodes Incorporated · AC-DC Controllers And Regulators · SO-8
AP3781S-13 from Diodes Incorporated, in a SO-8. 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 | The ground of the controller. |
| 2 | FB | input | The CV regulation is realized based on the voltage sampling of this pin, which the controller regulates to VFB of 2.4V. |
| 3 | VCC | power_in | The VCC pin supplies the power for the IC, with a recommended supply range of 10 V to 30 V. |
| 4 | CS | input | The CS is the current sense pin of the IC, and the IC turns off the power MOSFET according to the voltage on the CS pin. |
| 5 | OTP | input | Adjustable over temperature protection by an external NTC resistor connected from this pin to GND, shutting down at VOTP of 510 mV typical. |
| 6 | NC | unconnected | No Connection. |
| 7 | OUT | output | Output pin to drive an external MOSFET. |
| 8 | NC | unconnected | No Connection. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SO-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Startup Threshold | VTH_ST | 14.5 | 16 | 17.5 | V | 5 | |
| Minimum Operating Voltage | VOPR(MIN) | 6.1 | 6.8 | 7.5 | V | 5 | |
| Startup Current | IST | 1 | 3 | A | VCC=VTH_ST-1V before Startup | 5 | |
| Operating Current | ICC_OPR | 410 | 510 | 610 | A | Static Current | 5 |
| Peak Current Sense Threshold Voltage | VCS_H | 580 | 645 | 710 | mV | 40% to 100% CC Load | 5 |
| Built-In Line Compensation Resistor | RLINE | 45 | 55 | 65 | 5 | ||
| Leading Edge Blanking | tLEB | 330 | 420 | 510 | ns | 5 | |
| Feedback Threshold Voltage | VFB | 2.35 | 2.4 | 2.45 | V | Closed Loop Test of VOUT | 5 |
| Sample Ratio | SAMPLE_H | 75 | 80 | 85 | % | 40% to 100% CC Load | 5 |
| Maximum Off Time | tOFF(MAX) | 1.8 | 2 | 2.2 | ms | 5 | |
| Peak Driver Source Current | ISOURCE_PEAK | 29 | 39 | 49 | mA | 5 | |
| Sink Resistance | RDS(ON) | 7 | 8.2 | 9.4 | Ω | Note 6 | 5 |
| Over Voltage Protection at FB Pin | VFB(SOVP) | 3.3 | 3.6 | 3.9 | V | 5 | |
| Under Voltage Protection at FB Pin | VFB(SUVP) | 150 | 200 | 250 | mV | 5 | |
| Delay Time of SUVP | tDELAY(SUVP) | 58 | 64 | 70 | ms | 5 | |
| Over Voltage Protection at VCC Pin | VCC(OVP) | 31.5 | 34 | 36.5 | V | 5 | |
| Maximum Turn-on Time | tONP(MAX) | 13 | 19 | 25 | μs | 5 | |
| Minimum Peak Current Sense Voltage | VCS(MIN) | 70 | 100 | 130 | mV | at tONP = 4.5μs | 5 |
| High Threshold for FB Negative Voltage Protection | VFB_NEG_H | 27 | 36 | 45 | mV | 5 | |
| Internal TOTP Shutdown Temperature | TOTP | 135 | 150 | 165 | °C | Note 6 | 5 |
| Internal Temperature Hysteresis | THYS | 27 | 30 | 33 | °C | Note 6 | 5 |
| External OTP Shutdown Threshold | VOTP | 480 | 510 | 540 | mV | 5 | |
| External OTP Recovery Threshold | VOTP_REC | 770 | 810 | 850 | mV | 5 | |
| External OTP Shutdown Current | IOTP | 74 | 80 | 86 | μA | 5 | |
| Supply Voltage | VCC | 10 | 30 | V | 4 | ||
| Ambient Temperature | TA | -40 | 85 | °C | 4 | ||
| Supply Voltage | VCC | -0.3 | 37 | V | 4 | ||
| Input Voltage | VCS | -0.3 | 8 | V | 4 | ||
| FB Input Voltage | VFB | -0.7 | 8 | V | 4 | ||
| Operating Junction Temperature | TJ | -40 | 150 | °C | 4 | ||
| Storage Temperature | TSTG | -65 | 150 | °C | 4 | ||
| Lead Temperature (Soldering, 10s) | TLEAD | 300 | °C | Soldering, 10s | 4 | ||
| ESD Human Body Model | 2000 | V | 4 | ||||
| ESD Charged Device Model | 1000 | V | 4 | ||||
| Thermal Resistance (Junction to Case) | θJC | 16 | °C/W | Note 5 | 4 | ||
| Thermal Resistance (Junction to Ambient) | θJA | 117 | °C/W | Note 5 | 4 | ||
| Timing Ratio Secondary Winding Conduction Duty | tONS/tSW | 0.5 | Tested @ VFB = 2V (Note 6) | 5 | |||
| VCS Modulation | ΔVCS/VCS | 3 | % | 10% Load to Full Load (Note 6) | 5 | ||
| Gate Voltage | VGATE | 8 | V | 5 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | tin | Terminals: Finish, Matte Tin Plated Leads, Solderable per JESD22-B102 Weight: 0.076 grams (Approximate) | 14 |
CAD (KiCad official)
- Symbol:
AP3781S-13 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files:
ap3781s-13-etched.step/ap3781s-13-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ap3781s-13.step/ap3781s-13.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Diodes Incorporated datasheet (15 pp, sha256
370383f7934c464b, retrieved 2026-10-27, tier: manufacturer) - 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).