component
FOD2712AR2
Public Made by Adomby adom
onsemi Transistor, Photovoltaic Output Optoisolators, SOIC-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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README
markdownFOD2712AR2
onsemi · Transistor, Photovoltaic Output Optoisolators · SOIC-8
FOD2712AR2 from onsemi, in a SOIC-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 | NC | unconnected | Not connected internally; the datasheet states it should not be connected to the secondary side, as this may compromise the isolation structure. |
| 2 | C | output | Phototransistor collector, normally tied to a pull-up resistor whose value must account for the PWM IC voltage range and the CTR variation (minimum 100%). |
| 3 | E | passive | Phototransistor emitter, normally grounded; the phototransistor has no base connection. |
| 4 | NC | unconnected | Not connected internally; the datasheet states it should not be connected to the secondary side, as this may compromise the isolation structure. |
| 5 | GND | power_in | Secondary ground, to be connected to the secondary ground of the converter. |
| 6 | COMP | output | Error amplifier output and compensation pin; the compensation network must be attached between pins 6 and 7, and the error amplifier output has a minimum of the 1.24V reference voltage. |
| 7 | FB | input | Voltage feedback input, the inverting input of the error amplifier, which regulates this pin to the 1.24V reference (1% tolerance). |
| 8 | LED | input | LED anode, the input to the light emitting diode, which must be fed through a current limiting resistor; the minimum voltage applied to this pin is 2.74V (1.24V + 1.5V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-8 |
| Category | Optoisolators |
| 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 |
|---|---|---|---|---|---|---|---|
| Reference Voltage (TA = -40°C to +85°C) | VREF | 1.221 | 1.259 | V | TA = -40°C to +85°C; VCOMP = VFB, ILED = 10mA (Fig.1) | 5 | |
| Reference Voltage (TA = 25°C) | VREF | 1.228 | 1.24 | 1.252 | V | TA = 25°C; VCOMP = VFB, ILED = 10mA (Fig.1) | 5 |
| Deviation of VREF over temperature | VREF(DEV) | 4 | 12 | mV | TA = -40 to +85°C (Note 1) | 5 | |
| Ratio of Vref variation to error amplifier output | ∆VREF/∆VCOMP | -1.5 | -2.7 | mV/V | ILED = 10 mA, VCOMP = VREF to 12V (Fig. 2) | 5 | |
| Feedback Input Current | IREF | 0.15 | 0.5 | µA | ILED = 10mA, R1 = 10kΩ (Fig. 3) | 5 | |
| Deviation of IREF over temperature | IREF(DEV) | 0.15 | 0.3 | µA | TA = -40 to +85°C (Note 1) | 5 | |
| Minimum Drive Current | ILED(MIN) | 55 | 80 | µA | VCOMP = VFB (Fig.1) | 5 | |
| Off-state Error Amplifier Current | I(OFF) | 0.001 | 0.1 | µA | VLED = 6V, VFB = 0 (Fig.4) | 5 | |
| LED Forward Voltage | VF | 1.5 | V | ILED = 10mA, VCOMP = VFB (Fig.1) | 5 | ||
| Collector Dark Current | ICEO | 50 | nA | VCE = 10V (Fig. 5) | 6 | ||
| Collector-Emitter Voltage Breakdown | BVCEO | 70 | V | IC = 1.0mA | 6 | ||
| Emitter-Collector Voltage Breakdown | BVECO | 7 | V | IE = 100µA | 6 | ||
| Current Transfer Ratio | CTR | 100 | 200 | % | ILED = 10mA, VCOMP = VFB, VCE = 5V (Fig. 6) | 6 | |
| Collector-Emitter Saturation Voltage | VCE(SAT) | 0.4 | V | ILED = 10mA, VCOMP = VFB, IC = 2.5mA (Fig. 6) | 6 | ||
| Input-Output Insulation Leakage Current | II-O | 1 | µA | RH = 45%, TA = 25°C, t = 5s, VI-O = 3000 VDC (Note 1) | 6 | ||
| Withstand Insulation Voltage | VISO | 2500 | Vrms | RH ≤ 50%, TA = 25°C, t = 1 min. (Note 1) | 6 | ||
| Common Mode Transient Immunity at Output HIGH | CMH | 1 | kV/µs | ILED = 0mA, Vcm = 10 VPP, RL = 2.2kΩ (Fig. 8) (Note 2) | 6 | ||
| Common Mode Transient Immunity at Output LOW | CML | 1 | kV/µs | ILED = 10mA, Vcm = 10 VPP, RL = 2.2kΩ (Fig. 8) (Note 2) | 6 | ||
| Error Amplifier Output Impedance | /ZOUT/ | 0.25 | Ω | VCOMP = VFB, ILED = 0.1mA to 15mA, f < 1kHz (Note 2) | 5 | ||
| Storage Temperature | TSTG | -40 | 125 | °C | 4 | ||
| Operating Temperature | TOPR | -40 | 85 | °C | 4 | ||
| Input Voltage (LED pin) | VLED | 13.2 | V | 4 | |||
| Input DC Current | ILED | 20 | mA | 4 | |||
| Collector-Emitter Voltage | VCEO | 30 | V | 4 | |||
| Emitter-Collector Voltage | VECO | 7 | V | 4 | |||
| Collector Current | IC | 50 | mA | 4 | |||
| Input Power Dissipation | PD1 | 145 | mW | 4 | |||
| Transistor Power Dissipation | PD2 | 85 | mW | 4 | |||
| Total Power Dissipation | PD3 | 145 | mW | 4 |
CAD (KiCad official)
- Symbol:
FOD2712AR2 - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
fod2712ar2-etched.step/fod2712ar2-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);fod2712ar2.step/fod2712ar2.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (17 pp, sha256
50ad1bdf611ee132, retrieved 2026-10-18, 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).