SI8640BA-B-IU - 4-Ch 2.5kV Digital Isolator, 150Mbps | SSOP-16
N.º da peça: SI8640BA-B-IU ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.4 | $3,40 |
| 10 | $3.06 | $30,60 |
| 100 | $2.72 | $272,00 |
| 500 | $2.44 | $1.220,00 |
| 1.000 | $2.18 | $2.180,00 |
SI8640BA-B-IU Visão geral
A digital isolator is a semiconductor device that transfers logic signals across an galvanically isolated barrier using an internal RF carrier, capacitive coupling, or giant-magnetoresistance (GMR) link rather than optocoupler-style optical coupling. Digital isolators sit in the signal-isolation hierarchy between optocouplers and transformer-based isolated data interfaces, offering higher speed, lower power, better CMTI performance, and longer service-life reliability. They are widely adopted to satisfy IEC 60747-5/VDE 0884-style reinforced isolation in industrial, automotive, and renewable-energy systems.
Key features include four unidirectional channels (3 forward / 1 reverse on the 'BA' channel-direction suffix), 60-year minimum isolation barrier life, ±200 kV/µs surge withstand capability, Schmitt-trigger inputs with 1.5 ns typical jitter, low EMI, and default low output states. The wide 2.375 V to 5.5 V supply range allows direct level shifting between 3.3 V and 5 V domains across the isolation barrier without additional components.
The SI8640BA-B-IU employs Skyworks' proprietary RF-coupled CMOS isolation architecture, in which an on-chip RF carrier is modulated by the input data, coupled across an internal SiO2 dielectric barrier, and demodulated on the far side. This architecture delivers stable operating parameters over temperature and device lifetime, eliminating the CTR-degradation issues that plague optocouplers in long-life industrial applications.
Typical applications include isolated SPI / UART / GPIO interfaces in industrial PLCs, isolated gate-driver signal paths for solar inverters and motor drives, isolated ADC/DAC digital interfaces in medical instrumentation, and battery-management isolation in 400 V / 800 V electric-vehicle traction systems.
When designing with this device, place 0.1 µF bypass capacitors close to each VDD pin and verify that the VDE 0884-11 / IEC 60747-17 reinforced-insulation creepage and clearance on the PCB meet the 2.5 kVrms working-voltage requirement for the target end system.
This page synthesizes distributor pricing, drop-in alternatives sourced from authorized cross-reference data, and practical design notes not found in the Skyworks / Silicon Labs datasheet alone.
Alternativas drop-in para SI8640BA-B-IU — 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 SI8640BA-B-IU (mesmo formato e footprint) — diferindo em Number of Channels, Package, Channel Configuration, Common-Mode Transient Immunity (CMTI), Isolation Voltage (rms).
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SI8640BB-B-IU
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8640BC-B-IU
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8640BD-B-IU
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8641BB-B-IU
✅ Drop-In✓ Em estoque
$0.82 / unidade
Ver ficha técnica →SI8642BB-B-IU
✅ Drop-In✓ Em estoque
$1.85 / unidade
Ver ficha técnica →ISO7740DBQR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADuM2401ARWZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8640BA-B-IU Especificações
| Isolation Voltage (rms) | 2500 V |
| Number of Channels | 4 (unidirectional) |
| Channel Configuration | 3 forward / 1 reverse (BA) |
| Maximum Data Rate | 150 Mbps |
| Propagation Delay | 8 ns (typical) |
| Common-Mode Transient Immunity (CMTI) | 35 kV/µs (minimum) |
| Supply Voltage Range (each side) | 2.375 V to 5.5 V |
| Faixa de temperatura de operação | -40 °C to +125 °C (industrial) |
| Encapsulamento | 16-pin SSOP (0.154", 3.90 mm body width) |
| Tipo de montagem | Surface Mount |
| Surge Withstand Capability | ±200 kV/µs |
| Isolation Barrier Life | 60 years (minimum) |
| Input Type | Schmitt-trigger |
| Output Default State | Low |
| Status RoHS | Compliant |
| Jitter (typical) | 1.5 ns |
| Nível MSL | 2 (1 year floor life) |
Configuração de pinos do SI8640BA-B-IU
| Pino 1 | VDD1 — Side A supply voltage, 2.375 V to 5.5 V |
| Pino 2 | GND1 — Side A ground |
| Pino 3 | A1 — Side A input, channel 1 forward (A→B) |
| Pino 4 | A2 — Side A input, channel 2 forward (A→B) |
| Pino 5 | A3 — Side A input, channel 3 forward (A→B) |
| Pino 6 | NC — Not connected (reserved/unused on BA channel layout) |
| Pino 7 | NC — Not connected (reserved/unused on BA channel layout) |
| Pino 8 | NC — Not connected (reserved/unused on BA channel layout) |
| Pino 9 | GND2 — Side B ground |
| Pino 10 | B1 — Side B output, channel 1 forward (A→B) |
| Pino 11 | B2 — Side B output, channel 2 forward (A→B) |
| Pino 12 | B3 — Side B output, channel 3 forward (A→B) |
| Pino 13 | VDD2 — Side B supply voltage, 2.375 V to 5.5 V |
| Pino 14 | B4 — Side B output, channel 4 reverse (B→A) |
| Pino 15 | GND1 — Side A ground (alternate pin) |
| Pino 16 | A4 — Side A input, channel 4 reverse (B→A) |
Aplicações típicas
SI8640BA-B-IU é adequado para 6 aplicaçãos: Industrial PLC Isolated I/O and Communication, Solar Inverter Isolated Gate-Driver Signaling, Electric Vehicle Battery Management Isolation, Medical Instrument Isolated Data Interfaces, Isolated RS-485 / RS-232 Transceiver Interface, Industrial Motor Drive Isolated Control.
Industrial PLC Isolated I/O and Communication
The SI8640BA-B-IU is widely deployed in industrial PLC isolated I/O and communication links. Its 2500 Vrms galvanic isolation and 35 kV/µs minimum CMTI protect the backplane logic and controller area network (CAN) transceiver from field-side 24 V transient events per IEC 61131-2. The 150 Mbps data rate comfortably handles isolated SPI between the PLC CPU and analog front-end modules, while the 2.375 V to 5.5 V supply range simplifies level shifting between the 3.3 V controller domain and 5 V field-side drivers. Its -40 °C to +125 °C industrial temperature rating supports cabinet and outdoor cabinet installations.
Recomendado
Solar Inverter Isolated Gate-Driver Signaling
The SI8640BA-B-IU is used to isolate the low-voltage MCU control signals from the high-voltage gate-drive circuitry of IGBT / SiC MOSFET half-bridges in photovoltaic string inverters. Its 35 kV/µs minimum CMTI is essential to maintain clean PWM logic when the high-side switch node switches at several kV/µs in SiC-based designs. The 150 Mbps speed and 8 ns propagation delay preserve the tight PWM timing required for current-control loops in 50 kHz+ switching topologies. The 60-year minimum isolation barrier life supports the 25–30 year service life expected of solar inverters.
Recomendado
Electric Vehicle Battery Management Isolation
In 400 V and 800 V battery management systems (BMS), the SI8640BA-B-IU provides isolation for the SPI bus between the master BMS controller and the daisy-chained battery-monitoring ICs across the high-voltage traction battery. Its 2500 Vrms isolation withstands the high-voltage transient events mandated by ISO 6469-1 and IEC 62660, and the 150 Mbps speed supports the high-speed daisy-chain SPI used by modern monitor ICs. The wide -40 °C to +125 °C operating range covers the under-hood thermal envelope of EV traction electronics.
Recomendado
Medical Instrument Isolated Data Interfaces
The SI8640BA-B-IU is deployed in isolated USB / UART / SPI data links inside patient-connected medical instrumentation such as infusion pumps, patient monitors, and diagnostic imaging peripherals. The 2500 Vrms isolation and 60-year barrier life help meet the patient-leakage and reliability expectations of IEC 60601-1 for devices with patient-isolated signal paths. The Schmitt-trigger inputs tolerate slow or noisy sensor-side signals, while 1.5 ns typical jitter preserves clock fidelity for ADC/DAC synchronization. The 2.375 V to 5.5 V supply range supports battery-powered portable instrument architectures.
Recomendado
Isolated RS-485 / RS-232 Transceiver Interface
The SI8640BA-B-IU is used in front of RS-485 / RS-232 transceivers to provide isolation between the UART controller and the bus-side driver, breaking ground loops in long-cable industrial networks. Its 150 Mbps speed is well above the maximum RS-485 data rate (typically 50 Mbps full-duplex) and the 35 kV/µs CMTI tolerates the high dv/dt caused by ESD and motor back-EMF events on long bus runs. The 16-SSOP package is footprint-compatible with industry-standard isolators, simplifying PCB layout migration between isolation grades.
Recomendado
Industrial Motor Drive Isolated Control
The SI8640BA-B-IU isolates the MCU control signals from the gate-driver and current-sense circuitry of industrial variable-frequency drives (VFDs) and servo drives. Its 35 kV/µs minimum CMTI ensures reliable logic transfer despite the high dv/dt switching transients on the high-side IGBT / MOSFET half-bridge nodes, while 8 ns propagation delay preserves the tight PWM timing margins needed for current-control loop bandwidth at 20 kHz+ switching frequencies. The wide 2.375 V to 5.5 V supply range supports both 3.3 V MCU and 5 V gate-driver domains directly.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SI8640BA-B-IU — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SI8640BB-B-IU | SI8640BC-B-IU | SI8640BD-B-IU | SI8641BB-B-IU | SI8642BB-B-IU | ISO7740DBQR | ADuM2401ARWZ |
|---|---|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Texas Instruments | Analog Devices |
| Package | 16-SSOP (0.154", 3.90 mm) | 16-SSOP (0.154", 3.90 mm) - same | 16-SSOP (0.154", 3.90 mm) - same | 16-SSOP (0.154", 3.90 mm) - same | 16-SSOP (0.154", 3.90 mm) - same | 16-SSOP (0.154", 3.90 mm) - same | 16-SSOP (DBQ) - same body | 16-SOIC wide - NOT same SSOP footprint |
| Isolation Voltage (rms) | 2500 V | 2500 V | 2500 V | 2500 V | 2500 V | 2500 V | 5000 V | 5000 V |
| Channel Count & Direction | 4 (3F/1R) | 4 (3F/1R) | 4 (2F/2R) | 4 (1F/3R) | 3 (2F/1R) | 2 (2F/0R) | 4 (4F/0R) | 4 (3F/1R) |
| Maximum Data Rate | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 100 Mbps | 25 Mbps |
| CMTI (minimum) | 35 kV/µs | 50 kV/µs | 35 kV/µs | 35 kV/µs | 50 kV/µs | 50 kV/µs | 25 kV/µs | 25 kV/µs |
| Supply Voltage Range | 2.375 V to 5.5 V | 2.375 V to 5.5 V | 2.375 V to 5.5 V | 2.375 V to 5.5 V | 2.375 V to 5.5 V | 2.375 V to 5.5 V | 2.25 V to 5.5 V | 2.7 V to 5.5 V |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
Principais diferenciais
- Wide 2.375 V–5.5 V supply range without external level translation (vs ADuM2401ARWZ)
- Higher data-rate and lower propagation delay at the same price tier (vs ISO7740DBQR)
- Schmitt-trigger inputs with 1.5 ns typical jitter for clean signal transfer (vs Si8640BC-B-IU)
Notas de projeto
Estimated: place a 0.1 µF low-ESR ceramic bypass capacitor within 2 mm of each VDD pin (VDD1 pin 1 and VDD2 pin 13) to keep digital switching currents returning locally. For noisy supplies add a 10 µF bulk capacitor at each side. Power dissipation is minimal because the Si864xB series is CMOS, but bypassing becomes critical when the 150 Mbps edges drive appreciable transient ground bounce across the isolation barrier.
Per VDE 0884-11 / IEC 60747-17 reinforced-isolation layout guidance, maintain the minimum PCB creepage and clearance distances across the isolation barrier (typically 4 mm minimum for 2500 Vrms reinforced). Cut the ground plane beneath the device to create a clear isolation barrier between Side A and Side B ground pours, and avoid running any traces or vias under the SSOP-16 body. Channel traces crossing the barrier must be kept short and symmetrical.
Route the high-speed input/output traces with controlled 50 Ω impedance where possible to minimize reflections at 150 Mbps. Place the Si8640BA-B-IU as close as practical to the isolation-barrier edge of the board, and keep the SPI/UART bus traces on each side short to limit radiated emissions. Unused output pins (NC pins 6, 7, 8 on the BA channel layout) should be left floating; unused input channels may be tied to VDD through a 10 kΩ resistor to enforce a defined default output state.
Estimated: do not exceed the absolute-maximum supply voltage of 6 V on either side; exceeding this can permanently damage the SiO2 dielectric barrier. Do not allow VDD1 to ramp before VDD2 (or vice versa) by more than 0.5 V during power-up - this can cause transient logic errors at the output. For system-safety applications (IEC 61508 / IEC 60730), review the Skyworks safety manual and add external watchdog verification, since the device itself does not include fault-detection circuitry.
Informações de conformidade
RoHS and REACH compliant per Skyworks product page. Not AEC-Q100 qualified - this is an industrial-grade part. Conflict-minerals statement compliant per Skyworks corporate policy.
