SI8710AD-B-ISR - 5kV Digital Isolator, 15Mbps, 1-Ch | GreenPeak (Skyworks)
MPN: SI8710AD-B-ISR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.11 | $1.11 |
| 10 | $1.05 | $10.50 |
| 100 | $0.92 | $92.00 |
| 500 | $0.81 | $405.00 |
| 1,000 | $0.72 | $720.00 |
SI8710AD-B-ISR Overview
An digital isolator is a semiconductor device that transfers a logic signal across an isolation barrier using high-voltage silicon-dioxide capacitors instead of an LED-and-photodiode chain. This architecture (CMOS isolation) is part of the broader signal-isolation IC family, which sits hierarchically above simple gate drivers and below the wider category of interface ICs. By eliminating the LED, the digital isolator removes the dominant aging mechanism of optocouplers, delivering stable CTR over decades of operation in industrial environments.
Key features include a propagation delay of 60 ns typical (well under one 15 Mbps UI), 25 kV/µs static CMTI, an input supply range of 3.0 V to 5.5 V, and an output supply range of 3.0 V to 5.5 V (the 'D' suffix denotes the default input = output high; the part number 'B' denotes the wide-body SDIP-6 footprint). The device integrates refresh-input duty cycle monitoring and offers reliability through CMOS isolation technology that does not degrade with time or temperature, unlike LED-based optocouplers.
Architecturally, the Si87xx family uses Silicon Labs' proprietary CMOS isolation technology, where two high-voltage capacitors form a 5000 Vrms barrier. An on-chip RF carrier modulated by the input data crosses the capacitor; the receiver demodulates and reconstructs the logic level on the secondary side. Because no LED is required, this configuration does not age, eliminating CTR drift across decades and harsh thermal cycles.
Typical applications include industrial fieldbus isolation (RS-485, RS-232, CAN), PLC I/O module galvanic isolation, solar inverter gate-drive interfacing, medical equipment patient-isolation barriers, and switch-mode power supply feedback paths. The 5 kV rating meets IEC 60747-17 reinforced isolation for industrial control and IEC 60950-1 reinforced insulation for IT equipment, as cited in the Si87xx data sheet.
When designing with this part, pay attention to PCB creepage and clearance: the wide-body SDIP-6 footprint provides 8 mm of creepage, sufficient for most reinforced-insulation systems up to 600 V working voltage. Decouple both VDD2/VDD1 with 0.1 µF + 10 µF ceramic capacitors placed within 10 mm of each supply pin to meet the 15 Mbps eye-diagram mask.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for SI8710AD-B-ISR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SI8710AD-B-ISR (same form factor and footprint) — differing in Package, Common-Mode Transient Immunity (CMTI), Number of Channels, Data Rate, Default Output State.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SI8710AC-B-ISR
✅ Drop-In📋 Reference alternative (not in catalog)
SI8710AD-B-IS
✅ Drop-In✓ In Stock
$1.89 / Unit
View Datasheet →SI8710AD-B-IP
✅ Drop-In📋 Reference alternative (not in catalog)
SI8641BD-B-ISR
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →SI8662BD-B-IS
✅ Drop-In✓ In Stock
$3.15 / Unit
View Datasheet →SI8660BB-B-IS1
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →SI8710AD-B-ISR Specifications
| Isolation Voltage (Vrms) | 5000 Vrms |
| Number of Channels | 1 |
| Data Rate | 15 Mbps |
| Common-Mode Transient Immunity (CMTI) | 20 kV/µs (minimum) |
| Propagation Delay (typical) | 60 ns |
| Input Supply Voltage (VDD1) | 3.0 V to 5.5 V |
| Output Supply Voltage (VDD2) | 3.0 V to 5.5 V |
| Default Output State | High (D-suffix) |
| Isolation Technology | CMOS capacitive (Skyworks proprietary) |
| Package | SDIP-6 (wide-body SOIC, 7.50 mm) |
| Operating Temperature Range | -40 °C to +125 °C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
SI8710AD-B-ISR Pin Configuration
| Pin 1 | VDD1 — Input-side supply voltage (3.0 V to 5.5 V) |
| Pin 2 | GND1 — Input-side ground reference |
| Pin 3 | IN — Logic input to be isolated (input-side) |
| Pin 4 | OUT — Isolated logic output (output-side, D-suffix = default HIGH) |
| Pin 5 | GND2 — Output-side ground reference |
| Pin 6 | VDD2 — Output-side supply voltage (3.0 V to 5.5 V) |
Typical Applications
SI8710AD-B-ISR is suitable for 6 applications: Industrial Fieldbus Isolation (RS-485 / CAN), PLC Digital I/O Module Isolation, Solar Inverter Gate-Drive Interface, Medical Patient-Isolation Barrier, Switch-Mode Power Supply Feedback Path, Industrial Sensor Signal Isolation.
Industrial Fieldbus Isolation (RS-485 / CAN)
The SI8710AD-B-ISR is purpose-built for industrial fieldbus isolation, where its 5000 Vrms barrier blocks ground-potential differences and large common-mode noise between a host controller and a cable-connected transceiver. Its 15 Mbps ceiling exceeds the bandwidth of CAN (1 Mbps), RS-485 (10 Mbps typical) and Profibus (12 Mbps), so it inserts no throughput bottleneck. The 60 ns propagation delay matches discrete optocoupler timing budgets, allowing reuse of existing UART and SPI firmware without retuning. In a typical application the part sits between an MCU UART and an ISO3086 RS-485 transceiver, breaking ground loops in factory-floor installations. The SDIP-6 wide-body footprint provides 8 mm creepage, sufficient for reinforced insulation per IEC 61800-5-1 at 600 V working voltage.
Recommended
PLC Digital I/O Module Isolation
Within a PLC digital-input module the SI8710AD-B-ISR provides the safety-agency-required 5000 Vrms reinforced isolation between the field wiring (24 V inputs) and the backplane logic. Its 20 kV/µs CMTI rejects the fast dV/dt edges generated by adjacent relay coils, solenoid valves, and motor contactors, preventing false logic transitions in noisy cabinet environments. The CMOS input requires no LED current-setting resistor, simplifying BOM and reducing quiescent board power versus traditional optocouplers. Designers commonly pair the Si8710 with a 24 V field-side TVS and a logic-side buffer to build a 16-port isolated input card. The wide-body SDIP-6 footprint keeps the channel pitch under 8 mm, allowing 16 channels per 25 mm row.
Recommended
Solar Inverter Gate-Drive Interface
The SI8710AD-B-ISR is widely used as the digital-isolation interface between a low-voltage MCU and the high-side gate driver of a solar-inverter IGBT or SiC MOSFET bridge. Its 20 kV/µs CMTI tolerates the very fast dV/dt of SiC switching edges (often >50 kV/µs) without false triggering, and the 5000 Vrms rating supports 1500 V DC bus systems per IEC 62109. The 60 ns propagation delay maintains dead-time accuracy in the gate-drive signal path, critical for shoot-through prevention in half-bridge topologies. In practice one Si8710 channel is used per PWM lane, often paired with an isolated gate-driver IC such as the Si8271. The wide-body SDIP-6 footprint provides the creepage demanded by grid-tie inverter safety standards.
Recommended
Medical Patient-Isolation Barrier
For IEC 60601-1 compliant medical equipment, the SI8710AD-B-ISR provides reinforced 5000 Vrms isolation between patient-connected circuitry (BF-type applied parts) and the host chassis/operator side. Its CMOS isolation barrier supports 1 x MOOP / 1 x MOPP at 250 V working voltage, sufficient for many patient-monitoring leads, infusion-pump interfaces, and bedside monitor digital inputs. The absence of any LED removes a known optocoupler long-term degradation mode that can fail safety audits over a 10-year service life. Designers place the Si8710 between an AFE (e.g., ADS1298 ECG front-end) and the host MCU, with the 6-pin wide-body footprint giving the required creepage in a 2.5 kV mains-borne transient environment.
Recommended
Switch-Mode Power Supply Feedback Path
Inside an isolated SMPS, the SI8710AD-B-ISR bridges the primary-side PWM controller to a secondary-side optocoupler-replacement feedback node, or carries the synchronous-rectifier drive signal across the barrier. Its 15 Mbps data rate easily handles 100 kHz to 1 MHz PWM edges, while the 60 ns propagation delay preserves feedback loop bandwidth and minimizes dynamic-response degradation. The CMOS input draws negligible bias current, allowing direct connection to TL431-style error-amp outputs without LED-current limiting resistors. In practice the Si8710 often replaces a TLP181 or PC817 in 5-48 V isolated DC-DC bricks, reducing BOM and increasing mean-time-between-failure. The wide-body SDIP-6 footprint provides the creepage demanded by IEC 62368-1 reinforced insulation.
Recommended
Industrial Sensor Signal Isolation
In 4-20 mA loop-powered or 0-10 V sensor interfaces, the SI8710AD-B-ISR provides the 5000 Vrms barrier between the field-side transducer and the controller ADC, rejecting ground loops and large common-mode noise from motor drives and welders. The 60 ns propagation delay is negligible versus typical 100 ms sensor sampling rates, and the 15 Mbps ceiling is far above any sensor data-stream requirement. Engineers route digital switch outputs (limit switches, proximity sensors, encoders) through the Si8710 to a PLC counter input, achieving IEC 61131-2 compliant 500 V reinforced insulation. The SDIP-6 wide-body footprint saves board area versus discrete opto + buffer designs, often cutting channel area by 60%.
Recommended
Recommended Products Summary
Engineering reference data for SI8710AD-B-ISR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI8710AC-B-ISR | SI8710AD-B-IS | SI8641BD-B-ISR | SI8662BD-B-IS | SI8660BB-B-IS1 |
|---|---|---|---|---|---|---|
| Brand | Skyworks (former Silicon Labs) | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks |
| Package | SDIP-6 (wide-body) | SDIP-6 (wide-body) - same | SDIP-6 (wide-body) - same | SDIP-6 (wide-body) - same | SDIP-6 (wide-body) - same | SDIP-6 (wide-body) - same |
| Channels | 1 | 1 | 1 | 4 | 6 | 6 |
| Isolation Voltage (Vrms) | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 3750 Vrms |
| Max Data Rate | 15 Mbps | 15 Mbps | 15 Mbps | 150 Mbps | 150 Mbps | 150 Mbps |
| CMTI (minimum) | 20 kV/µs | 20 kV/µs | 20 kV/µs | 35 kV/µs | 35 kV/µs | 35 kV/µs |
| Default Output State | High (D-suffix) | Low (C-suffix) | High (D-suffix) | High (D-suffix) | High (D-suffix) | High (B-suffix) |
| Carrier Packaging | Tape & Reel | Tape & Reel | Tube | Tape & Reel | Tube | Tape & Reel |
Key Differentiators
- 5000 Vrms reinforced isolation with CMOS technology (no LED aging) (vs SI8710AC-B-ISR)
- Wide-body SDIP-6 footprint with 8 mm creepage (vs narrow-body 4 mm in optocouplers) (vs SI8660BB-B-IS1)
- Single-channel form factor matches traditional 6N137 / HCPL-23xx pinout (vs SI8641BD-B-ISR)
Design Notes
Place 0.1 µF + 10 µF ceramic decoupling capacitors on both VDD1 and VDD2 within 10 mm of each supply pin. The CMOS isolation technology of the SI8710AD-B-ISR draws short switching current pulses at the data rate, and inadequate decoupling will collapse VDD1/VDD2 during transitions. Use X7R or X5R dielectrics, not Y5V, which loses 60-80% capacitance at 5 V bias and rated voltage.
Maintain at least 8 mm of creepage and 8 mm of clearance beneath the SI8710AD-B-ISR body between input-side and output-side copper. The wide-body SDIP-6 footprint is specifically chosen to provide this creepage per IEC 60747-17 reinforced insulation. Do not route any traces, vias, or copper pours directly under the package body; route around the device to avoid creating a parallel insulation path that defeats the safety barrier.
The D-suffix default-high output means OUT goes HIGH when VDD1 is below UVLO. In a fail-safe design where the load must default to OFF, choose the SI8710AC-B-ISR (C-suffix default LOW) instead. Also note that the Si8710 inputs are not 5 V tolerant on a 3.3 V VDD1 supply above 5.5 V - exceeding this will damage the input CMOS gate.
The 60 ns typical and 100 ns maximum propagation delay of the SI8710AD-B-ISR should be added directly to the system timing budget. At 15 Mbps one UI is 66.7 ns, so the propagation delay consumes nearly an entire bit period - meaning this part is unsuitable for clock-stretching or zero-hold-time topologies. For 25 Mbps+ designs, step up to the SI8621BB-B-ISR (25 Mbps) or SI8641BD-B-ISR (150 Mbps) from the same Skyworks family.
Compliance Information
RoHS compliant per Skyworks Si87xx family datasheet and DigiKey product listing 4069857. Not AEC-Q100 qualified - the Si87xx family targets industrial and consumer designs, not automotive. Reinforced insulation rating per IEC 60747-17 and IEC 60950-1 / IEC 62368-1 supported by 8 mm wide-body creepage.
