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SI8421BB-D-IS

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Skyworks Solutions Digital Isolators, SOIC-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SI8421BB-D-IS

Skyworks Solutions · Digital Isolators · SOIC-8

SI8421BB-D-IS from Skyworks Solutions, 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 Side 1 power supply, operating range 2.70 V to 5.5 V, with 0.1 µF and 1 µF bypass capacitors to GND1 recommended.
2 A1 input Side 1 digital input or output; on the Si8421 it is the single VDD1-side input channel, passing data to B1.
3 A2 output Side 1 digital input or output; on the Si8421 it is the reverse channel output carrying data from B2.
4 GND1 power_in Side 1 ground.
5 GND2 power_in Side 2 ground.
6 B2 input Side 2 digital input or output; on the Si8421 it is the VDD2-side input channel, passing data to A2.
7 B1 output Side 2 digital input or output; it is the output of the forward channel from A1.
8 VDD2 power_in Side 2 power supply, operating range 2.70 V to 5.5 V, with 0.1 µF and 1 µF bypass capacitors to GND2 recommended.

Key specifications

Parameter Value
Manufacturer Skyworks Solutions
Package SOIC-8
Category Signal Isolation Devices
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
Ambient Operating Temperature TA -40 25 125 °C 150 Mbps, 15 pF, 5 V 4
Supply Voltage VDD1 VDD1 2.7 5.5 V 4
Supply Voltage VDD2 VDD2 2.7 5.5 V 4
Storage Temperature TSTG -65 150 °C 4
Operating Temperature TA -40 125 °C 4
Supply Voltage (Revision D) VDD1, VDD2 -0.5 6 V Revision D 4
Input Voltage VI -0.5 V max = VDD + 0.5 V 4
Output Voltage VO -0.5 V max = VDD + 0.5 V 4
Output Current Drive Channel IO 10 mA 4
Lead Solder Temperature (10 s) 260 °C 10 s 4
Maximum Isolation Voltage (1 s) 3600 VRMS 1 s 4
High Level Input Voltage VIH 2 V VDD1 = VDD2 = 5 V ±10%, TA = -40 to 125 °C 5
Low Level Input Voltage VIL 0.8 V VDD1 = VDD2 = 5 V ±10%, TA = -40 to 125 °C 5
High Level Output Voltage VOH 4.8 V Ioh = -4 mA; min printed as VDD1,VDD2, 0.4 5
Low Level Output Voltage VOL 0.2 0.4 V Iol = 4 mA 5
Input Leakage Current IL -10 10 µA 5
Output Impedance ZO 85 Ω nominal ±40% (note 1) 5
DC Supply Current VDD1, inputs 0 IDD1 1.3 2 mA Si8421Ax, Bx; All inputs 0 DC 5
DC Supply Current VDD2, inputs 0 IDD2 1.3 2 mA Si8421Ax, Bx; All inputs 0 DC 5
DC Supply Current VDD1, inputs 1 IDD1 2.3 3.5 mA Si8421Ax, Bx; All inputs 1 DC 5
DC Supply Current VDD2, inputs 1 IDD2 2.3 3.5 mA Si8421Ax, Bx; All inputs 1 DC 5
1 Mbps Supply Current VDD1 IDD1 1.9 2.9 mA Si8421Ax, Bx; All inputs = 500 kHz square wave, CI = 15 pF on all outputs 5
1 Mbps Supply Current VDD2 IDD2 1.9 2.9 mA Si8421Ax, Bx; All inputs = 500 kHz square wave, CI = 15 pF on all outputs 5
10 Mbps Supply Current VDD1 IDD1 2.2 3.3 mA Si8421Bx; All inputs = 5 MHz square wave, CI = 15 pF on all outputs 6
10 Mbps Supply Current VDD2 IDD2 2.2 3.3 mA Si8421Bx; All inputs = 5 MHz square wave, CI = 15 pF on all outputs 6
100 Mbps Supply Current VDD1 (5 V) IDD1 5.8 7.3 mA Si8421Bx; All inputs = 50 MHz square wave, CI = 15 pF on all outputs; VDD = 5 V ±10% 6
100 Mbps Supply Current VDD2 (5 V) IDD2 5.8 7.3 mA Si8421Bx; All inputs = 50 MHz square wave, CI = 15 pF on all outputs; VDD = 5 V ±10% 6
Maximum Data Rate 0 150 Mbps Si8421Bx 7
Minimum Pulse Width 6 ns Si8421Bx 7
Propagation Delay tPHL, tPLH 3 6 9.5 ns See Figure 1 7
Pulse Width Distortion /tPLH - tPHL/ PWD 1.5 2.5 ns See Figure 1 7
Propagation Delay Skew tPSK(P-P) 2 3 ns 7
Channel-Channel Skew tPSK 0.5 1.8 ns 7
Output Rise Time (5 V) tr 3.8 5 ns CL = 15 pF 7
Output Fall Time (5 V) tf 2.8 3.7 ns CL = 15 pF 7
Common Mode Transient Immunity CMTI 25 kV/µs VI = VDD or 0 V 7
Start-up Time tSU 15 40 µs 7
100 Mbps Supply Current VDD1 (3.3 V) IDD1 4.4 5.5 mA Si8421Bx; All inputs = 50 MHz square wave, CI = 15 pF on all outputs; VDD = 3.3 V ±10% 9
100 Mbps Supply Current VDD2 (3.3 V) IDD2 4.4 5.5 mA Si8421Bx; All inputs = 50 MHz square wave, CI = 15 pF on all outputs; VDD = 3.3 V ±10% 9
Output Rise Time (3.3 V) tr 4.3 6.1 ns CL = 15 pF; VDD = 3.3 V ±10% 10
Output Fall Time (3.3 V) tf 3 4.3 ns CL = 15 pF; VDD = 3.3 V ±10% 10
100 Mbps Supply Current VDD1 (2.70 V) IDD1 3.7 4.6 mA Si8421Bx; All inputs = 50 MHz square wave, CI = 15 pF on all outputs; VDD = 2.70 V 12
100 Mbps Supply Current VDD2 (2.70 V) IDD2 3.7 4.6 mA Si8421Bx; All inputs = 50 MHz square wave, CI = 15 pF on all outputs; VDD = 2.70 V 12
Output Rise Time (2.70 V) tr 4.8 6.5 ns CL = 15 pF; VDD = 2.70 V 13
Output Fall Time (2.70 V) tf 3.2 4.6 ns CL = 15 pF; VDD = 2.70 V 13
Junction-to-Air Thermal Resistance θJA 140 °C/W 16
Case Temperature (safety limit) TS 150 °C 15
Safety input, output, or supply current IS 160 mA θJA = 140 °C/W, VI = 5.5 V, TJ = 150 °C, TA = 25 °C 15
Device Power Dissipation PD 150 mW 15

CAD (KiCad official)

  • Symbol: SI8421BB-D-IS
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)
  • 3D model files: si8421bb-d-is-etched.step / si8421bb-d-is-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); si8421bb-d-is.step / si8421bb-d-is.glb are the bare package body.

Provenance

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

  • Datasheet: Skyworks Solutions datasheet (30 pp, sha256 1d36dd3ebae3afcd, retrieved 2026-10-23, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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