SI8715BC-A-IS - 3.75 kV 1-Ch Digital Isolator 15 Mbps SOIC-8 | Skyworks
N.º da peça: SI8715BC-A-IS ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.55 | $2,55 |
| 10 | $2.31 | $23,10 |
| 100 | $1.94 | $194,00 |
| 500 | $1.62 | $810,00 |
| 1.000 | $1.41 | $1.410,00 |
SI8715BC-A-IS Visão geral
A digital isolator is an interface IC that transfers a high-speed digital signal across an isolation barrier while blocking DC and low-frequency transients between two grounds. The SI8715BC-A-IS is part of the Si87xx family — pin-compatible, single-channel, drop-in upgrades for popular high-speed digital optocouplers — and offers roughly 10x lower FIT rate, wider temperature tolerance, and higher CMTI than a discrete opto/LED pair. Within the system taxonomy it belongs to digital isolators -> interface isolators -> isolation ICs -> power management & interface signal chain.
Key features include 3.75 kVrms withstand voltage per UL 1577, 2.5 V to 5.5 V logic-side supply, 50 ns typical propagation delay, low input current draw, and a wide industrial -40C to +125C operating range. The 8-SOIC body is the industry-standard optocoupler footprint, so legacy optocoupler designs can be retrofitted without PCB rework.
Architecturally, the device uses an on-chip RF oscillator that feeds a differential capacitive or transformer isolation barrier, with a demodulator and Schmitt-triggered output stage reproducing the input logic level on the load-side supply rail. The emulated-LED front end draws a defined bias current at the input pin, so it can be driven directly from a microcontroller GPIO without the resistor-divider network that an optocoupler requires.
Typical applications are PLC digital-input modules, industrial sensor isolation, isolated gate-driver signal paths, switched-mode power supply (SMPS) feedback, and isolated SPI / UART links. The part is also a drop-in optocoupler replacement in solid-state relays, motor-control I/O isolation, and medical-device signal isolation where regulatory 5 kV isolation is not required but 3.75 kVrms is sufficient.
When designing in, note that input pin 2 must be tied through a resistor to the driving logic source because the input is a current-driven emulated LED, not a CMOS logic input. Add a 0.1 uF decoupling capacitor close to each supply pin to ride through fast CMTI events, and avoid extending traces past the package body to maintain the rated isolation.
This page aggregates distributor pricing, same-brand Si87xx drop-in alternatives, and practical PCB/EMI design guidance that is not consolidated in the manufacturer datasheet, giving engineers a faster path from schematic to qualified BOM.
Alternativas drop-in para SI8715BC-A-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 SI8715BC-A-IS (mesmo formato e footprint) — diferindo em Common-Mode Transient Immunity (CMTI), Package, Number of Channels, Data Rate, Isolation Voltage.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SI8715BC-A-IP
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8715BC-A-ISR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8715CC-A-IS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI8710BC-B-IS
✅ Drop-In✓ Em estoque
$0.95 / unidade
Ver ficha técnica →SI8642BB-B-IU
✅ Drop-In✓ Em estoque
$1.85 / unidade
Ver ficha técnica →SI8715BC-A-IS Especificações
| Isolation Voltage (1 min) | 3750 Vrms |
| Isolation Type | Capacitive / RF carrier (LED emulator input) |
| Number of Channels | 1 |
| Directionality | Unidirectional (input to output) |
| Maximum Data Rate | 15 Mbps |
| Common-Mode Transient Immunity (CMTI) | >50 kV/us (typical) |
| Output Supply Voltage | 2.5 V to 5.5 V |
| Propagation Delay (typ.) | 50 ns |
| Input Drive | Current-driven emulated LED (external resistor required) |
| Encapsulamento | 8-SOIC (0.154", 3.90 mm width) |
| Tipo de montagem | Surface Mount |
| Faixa de temperatura de operação | -40 to +125 C |
| Status RoHS | Compliant |
| FIT Rate Advantage vs Optocoupler | Approximately 10x lower |
| Pin-to-Pin Optocoupler Replacement | Yes (drop-in) |
Configuração de pinos do SI8715BC-A-IS
| Pino 1 | NC — Not connected (no internal connection per datasheet) |
| Pino 2 | ANODE — Anode of emulated LED input (drive through external bias resistor) |
| Pino 3 | CATHODE — Cathode of emulated LED input |
| Pino 4 | GND1 — Input-side ground reference |
| Pino 5 | GND2 — Output-side ground reference |
| Pino 6 | OUT — Isolated logic-level output |
| Pino 7 | VDD — Output-side supply, 2.5 V to 5.5 V |
| Pino 8 | NC — Not connected (no internal connection per datasheet) |
Aplicações típicas
SI8715BC-A-IS é adequado para 7 aplicaçãos: PLC Digital Input Module Isolation, Isolated SPI / UART Communication Link, Switched-Mode Power Supply (SMPS) Feedback, Industrial Sensor Signal Isolation, Motor Drive I/O Isolation, Solid-State Relay (SSR) and Digital Output Module, Medical Device Patient Isolation.
PLC Digital Input Module Isolation
The SI8715BC-A-IS is well suited to PLC digital-input modules where 24V field-side signals must cross into the logic-side MCU. Its 3750 Vrms isolation, >50 kV/us CMTI, and 15 Mbps throughput let the part ride through motor-drive switching transients and ESD surges while passing debounced field input pulses cleanly. Compared to a discrete optocoupler, the SI8715BC-A-IS removes the LED ageing concern, supports wider temperature swings in panel-mounted enclosures, and lets the design reuse a single MCU-side 3.3 V or 5 V supply. Place a 0.1 uF bypass on each supply pin and a small input series resistor to set the emulated-LED bias current.
Recomendado
Isolated SPI / UART Communication Link
For isolating SPI or UART links between two grounds, the SI8715BC-A-IS provides 15 Mbps of throughput with 50 ns typical propagation delay, sufficient for full-duplex UART up to 7.5 Mbaud and SPI clocks around 7 MHz. The Si87xx family is pin-compatible with popular optocouplers, so the same board layout supports both legacy opto and modern digital isolator options. Use one SI8715BC-A-IS per direction for SPI signals and tie the input pin through a bias resistor sized per the datasheet input-current spec. The result is a clean, optocoupler-free signal chain immune to ground-potential shifts.
Recomendado
Switched-Mode Power Supply (SMPS) Feedback
In isolated AC-DC and DC-DC converters, the SI8715BC-A-IS isolates the primary-side PWM controller feedback path from the secondary-side output sense circuitry. The 3750 Vrms withstand matches typical offline converter isolation while the >50 kV/us CMTI handles fast switching transitions of the main MOSFET. Engineers prefer the SI8715BC-A-IS over an optocoupler+TL431 loop because it removes the aging and CTR drift problems that complicate loop compensation over the converter's life. Drive the input from a TL431 photodiode-emulation circuit or a buffered error-amp output through a bias resistor.
Recomendado
Industrial Sensor Signal Isolation
The SI8715BC-A-IS isolates digital outputs from proximity sensors, encoders, and limit switches that sit on a noisy factory-floor ground. With 15 Mbps throughput the part handles quadrature encoder pulses, SSI absolute encoder data, and high-frequency proximity trigger signals without bottlenecking the signal. Industrial 4-20 mA loops and HART-modulated signals can be digitized on the field side and passed through the SI8715BC-A-IS to a controller on a clean ground, eliminating common-mode ground loops in long cable runs.
Recomendado
Motor Drive I/O Isolation
In variable-frequency drives and servo amplifiers, the SI8715BC-A-IS isolates logic-level enable, fault, and PWM reference signals between the low-voltage controller and the high-voltage power stage. The wide -40C to +125C operating range survives the hot environment near IGBT modules, while >50 kV/us CMTI rejects the high dV/dt events that occur at the motor terminals. The 8-SOIC wide-body footprint matches the standard optocoupler land pattern used in legacy drive designs, simplifying retrofits to a more reliable silicon isolator with no PCB change.
Recomendado
Solid-State Relay (SSR) and Digital Output Module
The SI8715BC-A-IS replaces the LED side of a solid-state relay front end, providing the control-side isolation between the MCU GPIO and the AC/DC load switch. Its 3750 Vrms withstand handles 230 VAC load-side transients and its 15 Mbps speed supports fast-reacting digital outputs for industrial I/O modules. Compared to a discrete LED+phototriac, the SI8715BC-A-IS has no CTR degradation, so the digital-output timing remains stable over the device lifetime and across operating temperature, easing compliance with IEC 61131-2 digital output timing specs.
Recomendado
Medical Device Patient Isolation
For patient-connected medical electronics such as infusion pumps, patient monitors, and diagnostic instruments, the SI8715BC-A-IS provides a basic-insulation barrier between the patient-side sensor or actuator and the host processor. The 3750 Vrms withstand is appropriate for one MOPP of patient protection when combined with a power-supply-side reinforced insulator. The 10x lower FIT rate versus optocouplers supports the long service-life expectations of medical devices. Designers must still complete system-level IEC 60601-1 evaluation; the Si8715 family eases the path by providing a robust, well-documented isolator primitive.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SI8715BC-A-IS — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SI8715BC-A-IP | SI8715BC-A-ISR | SI8715CC-A-IS | SI8710BC-B-IS | SI8642BB-B-IU |
|---|---|---|---|---|---|---|
| Brand | Skyworks (formerly Silicon Labs) | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks |
| Package | 8-SOIC (0.154", 3.90 mm) | 8-DIP (functional SOIC-8 equivalent) | 8-SOIC (0.154") - same | 8-SOIC (0.154") - same | 8-SOIC (0.154") - same | QSOP-16 wide-body (Si86xx footprint) |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 2 |
| Maximum Data Rate | 15 Mbps | 15 Mbps | 15 Mbps | 15 Mbps | 1 Mbps | 150 Mbps |
| Isolation Voltage (rms) | 3750 V | 3750 V | 3750 V | 3750 V | 3750 V | 3750 V |
| CMTI (typical) | >50 kV/us | >50 kV/us | >50 kV/us | >50 kV/us | >50 kV/us | >50 kV/us |
| Output Logic Supply | 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
- Higher throughput than typical optocoupler in same footprint (vs popular optocouplers (e.g. HCPL-2531))
- Emulated-LED input removes CTR aging (vs discrete LED + photodetector optocoupler)
- Wide-body SOIC matches standard opto footprint (vs narrow-body SOIC digital isolators)
Notas de projeto
The SI8715BC-A-IS isolation is sensitive to creepage on the PCB surface. Maintain at least 4 mm of clearance between the input-side and output-side copper pour under the 8-SOIC body to preserve the rated 3750 Vrms isolation. Cut the input-side and output-side ground planes so they do not extend under the package, and route high-side signals only on their respective sides of the barrier. The exposed thermal pad option is not present on this SOIC, so no thermal management is needed for the isolator.
Pin 2 (ANODE) is a current-driven emulated LED input, not a CMOS logic input. Drive it through an external bias resistor sized per the datasheet input-current spec; do not connect it directly to a low-impedance logic source or 3.3 V rail. Withdrawing the input bias resistor can cause the input stage to draw no current, leaving the output floating or stuck. Also, do not leave pin 1 or pin 8 floating in the layout — they are NC but parasitic paths can appear if the pin is left as a stub.
Place a 0.1 uF X7R bypass capacitor within 2 mm of pin 7 (output supply) to ride through fast CMTI events without false output toggling. An additional 10 uF bulk capacitor is recommended on the output supply rail for motor-drive applications with high dV/dt switching. Keep the input bias-resistor traces short and avoid routing them parallel to noisy output traces to prevent capacitive coupling back through the input. The part's >50 kV/us typical CMTI handles most industrial environments when these bypass and layout rules are followed.
Informações de conformidade
RoHS and lead-free compliance per distributor product pages. Not AEC-Q100 qualified (industrial-grade only). UL 1577 rated at 3750 Vrms / 1 minute per Skyworks datasheet. Halogen-free status not directly confirmed in retrieved web data — set to unknown.
