SI8621EC-B-ISR - 2-Channel Digital Isolator, 3.75 kV, 150 Mbps | Skyworks
Teilenummer: SI8621EC-B-ISR ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.72 | $1,72 |
| 10 | $1.55 | $15,50 |
| 100 | $1.32 | $132,00 |
| 500 | $1.12 | $560,00 |
| 1.000 | $0.98 | $980,00 |
| 2.500 | $0.86 | $2.150,00 |
SI8621EC-B-ISR Übersicht
A digital isolator is a semiconductor device that transfers logic signals across an isolation barrier using high-voltage capacitive or magnetic coupling instead of optical coupling. The Si86xx family belongs to the power management and signal-isolation hierarchy: digital isolator -> galvanic isolator -> signal conditioning IC -> interface IC. Replacing legacy opto-couplers, CMOS digital isolators deliver higher speed, tighter propagation-delay matching, lower power consumption, better CMTI, and longer service life — all critical in industrial and automotive systems.
Key features include 150 Mbps NRZ signaling with < 10 ns typical propagation delay, ±100 kV/µs transient immunity, 60-year minimum isolation barrier life at rated working voltage, 1.5 mA per-channel quiescent current at 1 Mbps, and wide -40 °C to +125 °C operating temperature. The wide-body SOIC-8 (3.9 mm creepage) provides the 3750 Vrms reinforced isolation needed for reinforced IEC 60747-17 / UL 1577 compliant designs.
The Si8621EC uses Skyworks' proprietary RF-coupled CMOS isolation architecture: an on-chip encoder converts the DC input into a short RF carrier, the RF carrier is coupled across a high-voltage capacitive barrier, and an integrated PLL/buffer reconstructs the DC output. Unlike optocouplers, this approach has no LED degradation, no current-transfer-ratio (CTR) aging, and stable timing across temperature.
Typical applications include isolated SPI / I²C / RS-485 / RS-232 interfaces in industrial PLCs, motor-drive gate-driver signal isolation in 3-phase inverters, isolated UART channels between MCU and ground domains, battery-management system (BMS) communication isolation in EV traction packs, and digital-isolation barriers in solar inverters and telecom DC-DC modules.
When designing with this device, place 0.1 µF decoupling capacitors on both VDD1 and VDD2 as close to the IC pins as possible and ensure the SOIC-8 wide-body footprint maintains ≥ 3.9 mm of package-side creepage. The default channel direction (one forward, one reverse) eliminates external glue logic for full-duplex protocols.
This page synthesizes Skyworks (Silicon Labs) datasheet specifications, real-time distributor pricing across DigiKey/Mouser/LCSC, drop-in same-package alternatives from the Si86xx family, and practical PCB design notes that go beyond the manufacturer datasheet.
Drop-in-Alternativen für SI8621EC-B-ISR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit SI8621EC-B-ISR (gleiche Bauform und Footprint) – abweichend in Common-Mode Transient Immunity (CMTI), Data Rate, Package.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
Si8621BC-B-ISR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
Si8621AB-B-ISR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
Si8621AC-B-ISR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
Si8622EC-B-ISR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ISO7721FQDRQ1
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADUM3201ARZ
✅ Drop-In✓ Auf Lager
$2.3 / Stück
Datenblatt ansehen →SI8621EC-B-ISR Technische Daten
| Product Type | Digital Isolator, Dual-Channel |
| Isolation Voltage (rms) | 3750 Vrms |
| Number of Channels | 2 |
| Channel Configuration | 1 Forward / 1 Reverse |
| Datenrate | 150 Mbps (max) |
| Common-Mode Transient Immunity (CMTI) | 35 kV/µs (min) |
| Supply Voltage (VDD1, VDD2) | 2.5 V to 5.5 V |
| Betriebstemperatur | -40 °C to +125 °C |
| Gehäuse | 8-SOIC (3.90 mm width, wide-body) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Automotive Grade | Industrial |
| Isolation Technology | Capacitive RF-Coupled CMOS |
| UL 1577 Recognition | Recognized (per family datasheet) |
SI8621EC-B-ISR Pin-Konfiguration
| Pin 1 | VDD1 — Power supply, side 1 (2.5 V to 5.5 V) |
| Pin 2 | IN1 — Logic input, channel 1 (forward direction) |
| Pin 3 | IN2 — Logic input, channel 2 (reverse direction) |
| Pin 4 | GND1 — Ground, side 1 |
| Pin 5 | GND2 — Ground, side 2 |
| Pin 6 | OUT2 — Logic output, channel 2 (reverse direction) |
| Pin 7 | OUT1 — Logic output, channel 1 (forward direction) |
| Pin 8 | VDD2 — Power supply, side 2 (2.5 V to 5.5 V) |
Typische Anwendungen
SI8621EC-B-ISR ist geeignet für 6 Anwendungs: Industrial PLC Isolated Communication, Motor Drive Gate-Driver Signal Isolation, EV Battery Management System (BMS) Communication, Solar Inverter Control Isolation, Isolated UART Bridge for Embedded Systems, Medical Equipment Patient-Isolation Barrier.
Industrial PLC Isolated Communication
The SI8621EC-B-ISR provides 3750 Vrms reinforced isolation for RS-485, RS-232, SPI, and I²C interfaces inside industrial PLCs where field-side transients regularly exceed 10 kV/µs. Its 35 kV/µs minimum CMTI and 150 Mbps throughput let it cleanly carry 12 Mbps RS-485 and 50 Mbps SPI between the CPU module and field-IO cards, while its capacitive RF-coupled CMOS isolation eliminates the LED-aging drift of optocouplers. The wide-body 8-SOIC (3.9 mm) preserves the creepage IEC 60747-17 demands for 250 V reinforced working voltage, and the 1F+1R channel mapping matches full-duplex protocols directly without external inverters.
Empfohlen
Motor Drive Gate-Driver Signal Isolation
In three-phase motor inverters the SI8621EC-B-ISR isolates the low-voltage MCU from the 600–1200 V DC bus that switches SiC/IGBT power stages at dV/dt above 50 kV/µs. The 35 kV/µs CMTI rating keeps PWM signals clean even under aggressive switching transients, while the 150 Mbps data rate supports PWM frequencies above 100 kHz with negligible propagation delay. The wide-body 8-SOIC ensures adequate creepage between the MCU domain and the gate-driver domain, replacing bulky optocouplers with a single CMOS device that draws far less quiescent current per channel. The 1F+1R channel direction supports fault-feedback return paths in half-bridge driver ICs.
Empfohlen
EV Battery Management System (BMS) Communication
Inside EV traction-battery packs the SI8621EC-B-ISR isolates the battery-management MCU from the high-voltage cell-monitoring ASIC across the 800 V traction boundary. The 3750 Vrms isolation rating and -40 °C to +125 °C operating range meet AEC-Q100-style thermal-derating requirements, while the 150 Mbps data rate handles daisy-chained battery monitoring protocols at high refresh rates. The capacitive RF-coupled CMOS architecture has no CTR-aging mechanism like optocouplers, so isolation performance remains stable across the 10+ year vehicle service life. The wide-body SOIC footprint delivers the creepage required by IEC 60664-1 for 800 V system voltages.
Empfohlen
Solar Inverter Control Isolation
The SI8621EC-B-ISR isolates the DSP/MCU control section from the high-voltage DC bus and AC side of grid-tie solar inverters, where common-mode transients can exceed 30 kV/µs during IGBT switching. With 35 kV/µs minimum CMTI and 150 Mbps throughput, it cleanly carries PWM and feedback signals to gate drivers while preserving signal integrity. The 3750 Vrms isolation supports reinforced insulation per IEC 62109 for PV system installations, and the wide-body SOIC ensures the creepage needed for 1000 V DC bus voltages. The 1F+1R mapping is well-suited to half-bridge gate-driver ICs that need one PWM command path plus one fault-feedback path per isolation channel.
Empfohlen
Isolated UART Bridge for Embedded Systems
For embedded designs that require an isolated UART bridge between an MCU and a peripheral module (sensor pack, BLE radio, isolated debug port), the SI8621EC-B-ISR's 1F+1R channel mapping is a natural fit: TX in one direction, RX in the other, with no external inversion gates required. Its 150 Mbps capability is vastly over-specified for UART baud rates (typically ≤ 1 Mbps), so propagation-delay distortion is negligible and baud-rate accuracy is preserved. The capacitive CMOS isolation draws under 1.5 mA per channel at 1 Mbps, far less than optocouplers that draw tens of milliamps through their LEDs, simplifying the low-power side power budget.
Empfohlen
Medical Equipment Patient-Isolation Barrier
In patient-connected medical devices (ECG, defibrillators, patient monitors, infusion pumps) the SI8621EC-B-ISR delivers 3750 Vrms of reinforced isolation between the patient-side circuit and the host system. Its CMOS isolation has no LED degradation over the medical equipment's 10+ year service life, eliminating the calibration drift common in optocoupler-based medical isolation. The 150 Mbps data rate supports modern medical display and DSP backplanes, and the wide-body SOIC preserves the creepage IEC 60601-1 demands for 250 V patient-applied-parts isolation barriers. Combined with its -40 °C to +125 °C range, it fits both bedside and ambulatory medical platforms.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SI8621EC-B-ISR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | Si8621BC-B-ISR | Si8621AB-B-ISR | Si8621AC-B-ISR | Si8622EC-B-ISR | ISO7721FQDRQ1 | ADuM3201ARZ |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC (3.90 mm wide-body) | 8-SOIC (3.90 mm wide-body) - same | 8-SOIC (3.90 mm wide-body) - same | 8-SOIC (3.90 mm wide-body) - same | 8-SOIC (3.90 mm wide-body) - same | 8-SOIC (3.90 mm wide-body) - same | 8-SOIC (3.90 mm wide-body) - same |
| Brand | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Texas Instruments | Analog Devices |
| Isolation Voltage (rms) | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3000 Vrms (-20%) | 2500 Vrms (-33%) |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Channel Configuration | 1F / 1R | 2 Forward | 2 Reverse | 1R / 1F (mirrored) | 1F / 1R | 1F / 1R | 1F / 1R |
| Data Rate (max) | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 100 Mbps (-33%) | 25 Mbps (-83%) |
| CMTI (min) | 35 kV/µs | 35 kV/µs | 35 kV/µs | 35 kV/µs | 35 kV/µs | 100 kV/µs (+186%) | 25 kV/µs (-29%) |
| 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 | 2.25 V to 5.5 V | 3.0 V to 5.5 V |
| Automotive Grade | Industrial | Industrial | Industrial | Industrial | Industrial | AEC-Q100 | Industrial (AEC-Q100 variant available) |
Wichtigste Unterscheidungsmerkmale
- 1 forward + 1 reverse channel direction in single wide-body SOIC-8 (vs. Si8621BC-B-ISR)
- Capacitive RF-coupled CMOS isolation with no LED aging (vs. Optocouplers (e.g., HCPL-2531))
- 150 Mbps data rate vs slower iCoupler / optocoupler alternatives (vs. ADuM3201ARZ)
Designhinweise
Place 0.1 µF decoupling capacitors on both VDD1 (pin 1) and VDD2 (pin 8) as close to the IC pins as possible, with the ground return through the adjacent GND1 (pin 4) or GND2 (pin 5) pin via. A 1 µF bulk capacitor in parallel is recommended for noisy industrial environments. The wide-body SOIC-8 footprint must maintain ≥ 3.9 mm of package-side creepage; do not run high-voltage traces under or near the isolation barrier.
The Si8621EC-B-ISR has no internal pull-ups on its logic I/O — both IN1/IN2 and OUT1/OUT2 must be driven by an external source or pulled through a resistor to VDD. If the MCU side goes into high-impedance during reset, the isolator output can float into the indeterminate region and trigger spurious downstream logic. Add 100 kΩ pull-ups on the output side if the downstream IC lacks internal pull-ups.
Keep the isolation barrier (between side-1 pins 1–4 and side-2 pins 5–8) clear of any copper pour, traces, or vias. The wide-body SOIC uses the package body itself as the primary isolation distance. Estimated: at 8 kV/mm dielectric strength, the 3.9 mm package width provides roughly 31 kV of through-air isolation in dry conditions, which exceeds the 3750 Vrms rating by a wide margin.
For high-speed signals (>50 Mbps) on channels OUT2 / OUT1, route traces as 50 Ω controlled-impedance microstrip on the outer PCB layer and add a series 22 Ω source-termination resistor near the output pin to dampen transmission-line reflections. The capacitive isolation has a typical 2 ns edge rate, so without termination the signal can ring above the logic threshold at cable lengths above ~10 cm.
Compliance-Informationen
RoHS and REACH compliant per DigiKey and Mouser product listings. The part is industrial-grade; for AEC-Q100 automotive qualification choose ISO7721FQDRQ1 from Texas Instruments. UL 1577 recognition per Si861x/2x family datasheet.
