SI8640BD-B-IS - 4-Ch 5kV Digital Isolator, 150Mbps | Skyworks
N.º da peça: SI8640BD-B-IS ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.32 | $3,32 |
| 10 | $3.05 | $30,50 |
| 100 | $2.62 | $262,00 |
| 500 | $2.34 | $1.170,00 |
| 1.000 | $2.1 | $2.100,00 |
| 3.000 | $1.89 | $5.670,00 |
SI8640BD-B-IS Visão geral
A digital isolator is an interface IC that transfers logic signals between two domains at very different voltage potentials while blocking DC and low-frequency currents. By replacing optocouplers, digital isolators eliminate the slow LED degradation, current-consumption penalties, and bulky footprints that limit legacy optocoupler designs. Digital isolators sit within the broader hierarchy of galvanic isolation components - between basic optocouplers and fully integrated isolated gate drivers / isolated ADC front-ends - and they are a foundational building block inside industrial PLCs, motor drives, solar inverters, and medical equipment.
Key specifications include 2.5 V to 5.5 V supply range on each side, 1.8 V logic compatibility with proper level shifting, 35 kV/us minimum CMTI, 60-year minimum insulation barrier life, and 8 ns typical propagation delay. The wide-body SOIC package provides the 8 mm creepage required for reinforced insulation at 5000 Vrms working voltage, and supports PCB layouts that survive 8 kV surge and 1.2 kV ring-wave tests per IEC 60700-equivalent methods.
The Si864x architecture pairs an RF carrier on the input side with a differential coil structure etched inside the package, with a second demodulator on the output side. The four channels share a single isolation barrier which trims die cost versus per-channel optocouplers. All four channels are unidirectional in the same direction (4/0 forward configuration), making this part the natural choice when four logic signals all need to cross from one side to the other.
Typical applications include industrial fieldbus isolation (RS-485, CAN, SPI), motor control gate-drive signal isolation, solar inverter power-conversion feedback, medical equipment patient-isolation barriers, and PLC analog/digital I/O modules. It is also a strong fit for any system requiring reinforced 5 kV isolation per IEC 60747-17 (V) or equivalent standards.
When designing with this part, place 0.1 uF decoupling capacitors on both VDD1 and VDD2 within 2 mm of the supply pins and avoid routing signal traces or copper pours directly under the body of the WSOIC package - any stray capacitance under the coil structure will degrade CMTI performance. Confirm that downstream production code lines will accept the propagation delay above 0.5 ns.
This page synthesizes distributor pricing, drop-in alternatives from Skyworks and competitor families, and practical design notes not consolidated in the manufacturer datasheet, helping engineers select and qualify the SI8640BD-B-IS with confidence.
Alternativas drop-in para SI8640BD-B-IS — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com SI8640BD-B-IS (mesmo formato e footprint) — diferindo em Package, Number of Channels, Common-Mode Transient Immunity (CMTI), MSL Level, Channel Configuration.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SI8640BD-B-ISR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8640BB-B-IS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8641BD-B-IS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8642BD-B-IS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8643BD-B-IS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8640BD-B-IS Especificações
| Isolation Voltage (rms) | 5000 Vrms |
| Number of Channels | 4 (4 forward / 0 reverse) |
| Channel Direction | Unidirectional, all same direction |
| Maximum Data Rate | 150 Mbps |
| Propagation Delay (typ) | 8 ns |
| Common-Mode Transient Immunity (min) | 35 kV/us |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Logic Compatibility | 1.8 V to 5 V with level translation |
| Default Channel Output | Low |
| Package Type | Wide-body SOIC (WSOIC-16) |
| Package Width | 0.295 in / 7.50 mm |
| Creepage Distance | 8 mm |
| Faixa de temperatura de operação | -40 C to +125 C |
| Tipo de montagem | Surface Mount |
| Nível MSL | 3 (168 hours) |
| Status RoHS | Compliant |
| Lead-Free | Yes |
| Insulation Barrier Life | 60 years minimum |
Configuração de pinos do SI8640BD-B-IS
| Pino 1 | VDD1 — Side 1 power supply, 2.5 V to 5.5 V |
| Pino 2 | GND1 — Side 1 ground reference |
| Pino 3 | INA — Side 1 input channel A |
| Pino 4 | INB — Side 1 input channel B |
| Pino 5 | INC — Side 1 input channel C |
| Pino 6 | IND — Side 1 input channel D |
| Pino 7 | NC — Not connected (per datasheet) |
| Pino 8 | GND2 — Side 2 ground reference |
| Pino 9 | VDD2 — Side 2 power supply, 2.5 V to 5.5 V |
| Pino 10 | OUTD — Side 2 output channel D |
| Pino 11 | OUTC — Side 2 output channel C |
| Pino 12 | OUTB — Side 2 output channel B |
| Pino 13 | OUTA — Side 2 output channel A |
| Pino 14 | NC — Not connected (per datasheet) |
| Pino 15 | GND1 — Side 1 ground reference (duplicate) |
| Pino 16 | VDD1 — Side 1 power supply (duplicate) |
Aplicações típicas
SI8640BD-B-IS é adequado para 6 aplicaçãos: Industrial RS-485 / CAN Bus Isolation, Motor Control Gate-Drive Signal Isolation, Solar Inverter Power-Conversion Feedback, Medical Equipment Patient-Isolation Barriers, PLC Analog/Digital I/O Modules, Isolated SPI / Digital Audio Interface.
Industrial RS-485 / CAN Bus Isolation
The SI8640BD-B-IS is well suited to industrial RS-485 and CAN bus isolation where four unidirectional signals must cross between a 3.3 V MCU domain and a 5 V bus transceiver on a field-wired cable. The 5000 Vrms isolation and 35 kV/us CMTI protect the controller from ground-potential rise and fast transients on long cable runs in factory environments. Each side runs from 2.5 V to 5.5 V, enabling direct interfacing with 3.3 V MCUs and 5 V transceivers without extra level shifters. Place 0.1 uF decoupling capacitors close to both VDD1 and VDD2, and route the bus traces away from switching power stages to preserve the 150 Mbps bandwidth headroom for CAN-FD or high-speed SPI overlay.
Recomendado
Motor Control Gate-Drive Signal Isolation
The SI8640BD-B-IS isolates gate-drive PWM signals and fault feedback between a low-voltage MCU and a high-voltage IGBT or SiC inverter stage. The 5000 Vrms isolation and 35 kV/us CMTI cleanly reject the fast dV/dt transients produced by the power stage switching nodes, preventing logic corruption in the controller. With 8 ns propagation delay and 150 Mbps bandwidth, the part supports PWM frequencies above 100 kHz with minimal dead-time penalty, which is critical for high-efficiency motor control. Use the four channels to isolate three PWM phases plus a fault feedback signal in a standard 3-phase inverter. Mount the WSOIC-16 package on the low-voltage side of the isolation barrier with adequate creepage clearance maintained on the PCB.
Recomendado
Solar Inverter Power-Conversion Feedback
The SI8640BD-B-IS isolates control and feedback signals between the low-voltage controller board and the high-voltage DC-DC or DC-AC power stage in a solar inverter. The 5000 Vrms rating and 8 mm creepage satisfy the reinforced insulation requirements of grid-tie photovoltaic inverters where the high-voltage DC bus can reach 1000 V or higher. With four channels moving in the same direction, the part carries PWM drive signals, current shunt amplifier output, and fault flags from the analog front-end to the controller. The 2.5 V to 5.5 V supply range on both sides simplifies interfacing to analog isolators and gate drivers on the high-voltage side while staying logic-compatible with the MCU on the low-voltage side.
Recomendado
Medical Equipment Patient-Isolation Barriers
The SI8640BD-B-IS provides the reinforced 5 kV isolation barrier required between patient-connected circuits and the main system in medical devices such as patient monitors, infusion pumps, and ECG equipment. The 60-year minimum insulation barrier life and 5000 Vrms rating satisfy IEC 60601-1 reinforced isolation requirements when used in conjunction with adequate creepage on the PCB. With 150 Mbps bandwidth per channel, the part isolates SPI data between the isolated front-end ADC and the main controller. Use one channel for synchronization, two channels for SPI data transfer, and one channel for interrupt/handshake signals. The CMOS-based isolation barrier eliminates the LED-aging concerns of legacy optocouplers, improving long-term reliability in life-support equipment.
Recomendado
PLC Analog/Digital I/O Modules
The SI8640BD-B-IS integrates well into PLC analog and digital I/O modules where four isolated channels per chip reduce board space and BOM cost. Each I/O channel needs reinforced isolation from the field wiring, which the 5000 Vrms rating and 8 mm creepage provide. The 150 Mbps bandwidth handles fast digital I/O update rates and analog-to-digital converter data streams simultaneously. The four unidirectional channels map naturally to a typical analog input module (clock, sync, data, and chip-select signals crossing from sensor side to MCU side). The wide-body SOIC-16 package sits comfortably on the field-side of the isolation barrier with clear separation from the logic-side components.
Recomendado
Isolated SPI / Digital Audio Interface
The SI8640BD-B-IS isolates high-speed SPI communication between a controller and a remote peripheral or between two MCU domains at different ground references. With 150 Mbps bandwidth and 8 ns propagation delay, the part comfortably supports SPI clock rates up to 30 MHz or even higher, leaving margin for digital audio I2S streams that often run at 12.288 MHz or more. The four channels map cleanly to SPI SCK, MOSI, MISO, and CS signals, or to I2S BCLK, LRCLK, and two data lines. The CMOS-based isolation barrier introduces no LED-like aging, ensuring consistent timing over the product lifetime - a critical advantage in professional audio and high-reliability embedded systems.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SI8640BD-B-IS — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SI8640BD-B-ISR | SI8640BB-B-IS | SI8641BD-B-IS | SI8642BD-B-IS | SI8643BD-B-IS |
|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
| Package | WSOIC-16 (0.295") | WSOIC-16 (0.295") - same | WSOIC-16 (0.295") - same | WSOIC-16 (0.295") - same | WSOIC-16 (0.295") - same | WSOIC-16 (0.295") - same |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| Channel Direction | 4/0 (all forward) | 4/0 | 4/0 | 3/1 | 2/2 | 1/3 |
| Maximum Data Rate | 150 Mbps | 150 Mbps | 25 Mbps | 150 Mbps | 150 Mbps | 150 Mbps |
| Propagation Delay (typ) | 8 ns | 8 ns | 20 ns | 8 ns | 8 ns | 8 ns |
| Isolation Voltage (rms) | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms |
| CMTI (min) | 35 kV/us | 35 kV/us | 35 kV/us | 35 kV/us | 35 kV/us | 35 kV/us |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V |
Principais diferenciais
- Highest speed grade at 150 Mbps in the Si864x family for this footprint (vs SI8640BB-B-IS)
- All four channels in same direction for unidirectional signal grouping (vs SI8641BD-B-IS)
- Wide-body SOIC-16 footprint with 8 mm creepage for reinforced 5 kV isolation (vs Narrow-body SOIC-16 isolators (e.g. SI863x family))
Notas de projeto
Provide a 0.1 uF low-ESR ceramic decoupling capacitor on both VDD1 (pin 1 and pin 16) and VDD2 (pin 9) within 2 mm of the supply pins. Add a 1 uF to 10 uF bulk capacitor on each side if the upstream regulator is more than 25 mm away. The two supplies are galvanically isolated, so each side must have its own local decoupling - sharing a capacitor across the barrier defeats the isolation. Power sequencing between VDD1 and VDD2 is not required; the part initializes correctly regardless of which supply ramps first.
Maintain at least 8 mm of creepage on the PCB under and around the WSOIC-16 package body to preserve the 5000 Vrms isolation rating. Do not route any traces, vias, or copper pours directly under the package body - any stray capacitance or partial discharge path under the coil structure can degrade CMTI performance. Keep the side 1 and side 2 ground planes clearly separated with a physical isolation moat matching the package footprint.
Do not place low-voltage logic signals or sensitive analog traces immediately adjacent to the WSOIC-16 package on the high-voltage side - capacitive coupling into the coil structure can introduce noise. When driving the inputs from a logic source with long traces (>25 mm), add a series damping resistor (22 ohm to 100 ohm) near the input pin to prevent reflection-induced jitter. Confirm that downstream production code lines using the SI8640BD-B-IS will tolerate the part's propagation delay of 8 ns typical, and ensure the system design accounts for channel-to-channel skew of 2 ns.
Informações de conformidade
RoHS compliant per Skyworks product page. Reinforced insulation rated to 5000 Vrms per IEC 60747-17 (V). Not AEC-Q100 qualified - choose Si8640ED variant for automotive applications. Insulation barrier life rated 60 years minimum.
