component
ADuM1281ARZ
Public Made by Adomby adom
Analog Devices Digital Isolators, 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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Contents
README
markdownADuM1281ARZ
Analog Devices · Digital Isolators · SOIC-8
ADuM1281ARZ from Analog Devices, 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 | VDD1 | power_in | Supply voltage for isolator side 1, specified at 3.135 V to 5.5 V. |
| 2 | VOA | output | Logic output A, the isolated output channel A on side 2. |
| 3 | VIB | input | Logic input B, the input channel B on side 1 of the isolation barrier. |
| 4 | GND1 | power_in | Ground 1 is the ground reference for isolator side 1. |
| 5 | GND2 | power_in | Ground 2 is the ground reference for isolator side 2. |
| 6 | VOB | output | Logic output B, the isolated output channel B on side 2. |
| 7 | VIA | input | Logic input A, the input channel A on side 1 of the isolation barrier. |
| 8 | VDD2 | power_in | Supply voltage for isolator side 2, specified at 3.135 V to 5.5 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SOIC-8 |
| Category | Interface ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Propagation Delay (5 V operation, A grade) | tPHL, tPLH | 50 | ns | 50% input to 50% output | 3 | ||
| Propagation Delay (3.3 V operation, A grade) | tPHL, tPLH | 50 | ns | 50% input to 50% output | 4 | ||
| Supply Current ADuM1281 IDD1 (1 Mbps, 5 V) | IDD1 | 2.1 | 2.6 | mA | No load, 1 Mbps | 3 | |
| Supply Current ADuM1281 IDD2 (1 Mbps, 5 V) | IDD2 | 2.3 | 2.9 | mA | No load, 1 Mbps | 3 | |
| Supply Current ADuM1281 IDD1 (25 Mbps, 5 V) | IDD1 | 4.9 | 6 | mA | No load, 25 Mbps | 3 | |
| Supply Current ADuM1281 IDD2 (25 Mbps, 5 V) | IDD2 | 4.7 | 6.4 | mA | No load, 25 Mbps | 3 | |
| Supply Current ADuM1281 IDD1 (100 Mbps, 5 V) | IDD1 | 15 | 19 | mA | No load, 100 Mbps | 3 | |
| Supply Current ADuM1281 IDD2 (100 Mbps, 5 V) | IDD2 | 15.6 | 19 | mA | No load, 100 Mbps | 3 | |
| Supply Current ADuM1281 IDD1 (1 Mbps, 3.3 V) | IDD1 | 1.6 | 2.1 | mA | No load, 1 Mbps | 4 | |
| Supply Current ADuM1281 IDD2 (1 Mbps, 3.3 V) | IDD2 | 1.7 | 2.3 | mA | No load, 1 Mbps | 4 | |
| Quiescent Input Supply Current | IDDI(Q) | 0.54 | 0.8 | mA | 5 V operation, all models | 3 | |
| Quiescent Output Supply Current | IDDO(Q) | 1.6 | 2 | mA | 5 V operation, all models | 3 | |
| Input Current per Channel | II | -10 | 0.01 | 10 | µA | 0 V ≤ VIx ≤ VDDx | 3 |
| Undervoltage Lockout Positive VDDx Threshold | VDDXUV+ | 2.75 | V | 3 | |||
| Undervoltage Lockout Negative VDDx Threshold | VDDXUV− | 2.65 | V | 3 | |||
| Common-Mode Transient Immunity | /CM/ | 25 | 35 | kV/µs | VIx = VDDx, VCM = 1000 V, transient magnitude = 800 V | 3 | |
| Refresh Period | tr | 1.6 | µs | 3 | |||
| Output Rise/Fall Time | tR/tF | 2.5 | ns | 10% to 90% | 3 | ||
| Operating Temperature | TA | -40 | 125 | °C | 10 | ||
| Supply Voltages | VDD1, VDD2 | 3.135 | 5.5 | V | A, B, and C Grades | 10 | |
| Input Signal Rise and Fall Times | 1 | ms | 10 | ||||
| Storage Temperature | TST | -65 | 150 | °C | 11 | ||
| Ambient Operating Temperature | TA | -40 | 125 | °C | 11 | ||
| Supply Voltages | VDD1, VDD2 | -0.5 | 7 | V | 11 | ||
| Average Output Current per Pin Side 1 | IO1 | -10 | 10 | mA | 11 | ||
| Average Output Current per Pin Side 2 | IO2 | -10 | 10 | mA | 11 | ||
| Common-Mode Transients | -100 | 100 | kV/μs | Refers to common-mode transients across the insulation barrier | 11 | ||
| IC Junction-to-Ambient Thermal Resistance | θJA | 85 | °C/W | Thermocouple located at center of package underside | 8 | ||
| Safety Limiting Case Temperature | TS | 150 | °C | Maximum value allowed in the event of a failure | 9 | ||
| Total IDD1 and IDD2 Safety Limiting Current | IS | 290 | mA | Maximum value allowed in the event of a failure | 9 |
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 |
|---|---|---|---|---|
| housing | pC | In accordance with DIN EN IEC 60747-17 (VDE 0884-17), each ADuM1280/ADuM1281/ADuM1285/ADuM1286 is proof tested by applying an insulation test voltage ≥ 1050 VPEAK for 1 second (partial discharge detec | 8 |
CAD (KiCad official)
- Symbol:
ADuM1281ARZ - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
adum1281arz-etched.step/adum1281arz-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);adum1281arz.step/adum1281arz.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Analog Devices datasheet (18 pp, sha256
9143762bd346e43a, retrieved 2026-11-02, 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).