SI8442AB-C-IS - 4-Ch 2.5kV Digital Isolator 1Mbps | Skyworks
Référence : SI8442AB-C-IS ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.95 | $1,95 |
| 10 | $1.75 | $17,50 |
| 100 | $1.55 | $155,00 |
| 500 | $1.38 | $690,00 |
| 1 000 | $1.2 | $1 200,00 |
| 3 000 | $1.05 | $3 150,00 |
SI8442AB-C-IS Présentation
A digital isolator is a semiconductor device that transfers digital signals between two galvanically isolated circuit domains using an internal isolation barrier. The SI8442 family uses Skyworks' proprietary RF isolation technology, which embeds an RF carrier across a silicon-dioxide isolation barrier rather than the older optocoupler or transformer approaches. Within the broader signal-chain taxonomy, the SI8442AB-C-IS is a general-purpose digital isolator -> quad-channel isolator -> digital isolator -> signal isolation IC -> semiconductor. Modern CMOS digital isolators like the SI844x series typically replace legacy optocouplers to achieve lower power, faster propagation, tighter timing, and higher CMTI.
Key specifications include 2.70 V to 5.5 V wide operating supply range on both sides, less than 1.6 mA per channel typical quiescent current at 1 Mbps and 5 V, 25 kV/µs typical common-mode transient immunity (CMTI), and 35 ns typical propagation delay. The wide-body SOIC-16 package delivers the standard 8 mm creepage/clearance required for reinforced 2500 Vrms isolation per UL 1577, IEC 60747-17, and CSA 5A component standards.
Architecturally, each channel contains an RF encoder on the input side, an isolation barrier using on-chip transformers, and a decoder on the output side. Both VDD1 and VDD2 can be powered independently from any source within 2.70-5.5 V, allowing level translation between mixed-voltage domains. The default-channel output is high; channels return to the correct state on the first input transition - no start-up initialization is required.
Typical applications include I2C and SMBus isolation, isolated SPI/UART interfaces, industrial field-bus isolation (RS-485, CAN), motor control gate-driver signal isolation, isolated ADC/DAC digital interfaces, and medical equipment patient-isolation barriers. The SI8442AB-C-IS is also frequently used in solar inverters, EV battery management, and PLC digital-input modules.
When designing with this part, place 0.1 µF bypass capacitors as close as possible to both VDD pins and route the GND1/GND2 return paths to keep the barrier capacitance balanced. Verify that the PCB layout maintains at least 8 mm creepage across the barrier; do not place traces or copper under the SOIC-16 body that bridge the input and output sides.
This page synthesizes distributor pricing from DigiKey and LCSC, pin-compatible Si844x family variants, and practical PCB/layout guidance not found on a single manufacturer datasheet page.
Alternatives de remplacement direct pour SI8442AB-C-IS — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec SI8442AB-C-IS (même facteur de forme et même empreinte) — différant par Package, Common-Mode Transient Immunity (CMTI), Number of Channels, Operating Temperature Range, Technology.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
SI8442BB-C-IS
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI8442AB-C-ISR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SI8442AB-D-IS
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ISO7841DW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADUM1411ARWZ
✅ Remplacement direct✓ En stock
$1.75 / unité
Voir la fiche technique →SI8422BB-D-IS
✅ Remplacement direct✓ En stock
$1.52 / unité
Voir la fiche technique →SI8442AB-C-IS Spécifications
| Manufacturer | Skyworks Solutions Inc. |
| Product Type | Digital Isolator (CMOS, RF-isolation) |
| Number of Channels | 4 |
| Channel Configuration | 2 Forward / 2 Reverse |
| Isolation Voltage (Vrms) | 2500 Vrms |
| Data Rate (max) | 1 Mbps |
| Propagation Delay (typical) | 35 ns |
| Common-Mode Transient Immunity (CMTI) | 25 kV/µs (typical) |
| Supply Voltage Range (VDD1, VDD2) | 2.70 V to 5.5 V |
| Quiescent Current (typ, 5 V, 1 Mbps) | < 1.6 mA per channel |
| Plage de température de fonctionnement | -40 °C to +125 °C (industrial) |
| Boîtier / Format | 16-SOIC (0.295", 7.50 mm Body Width, wide-body) |
| Default Output State | High (no start-up initialization required) |
| Component Safety Standards | UL 1577, IEC 60747, CSA 5A |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
Configuration des broches de SI8442AB-C-IS
| Broche 1 | VDD1 — Side-1 supply voltage, 2.70 V to 5.5 V |
| Broche 2 | GND1 — Side-1 ground return |
| Broche 3 | A1 — Input channel A (side 1) |
| Broche 4 | B1 — Input channel B (side 1) |
| Broche 5 | NC — No internal connection (reserved) |
| Broche 6 | C1 — Input channel C (side 1) |
| Broche 7 | D1 — Input channel D (side 1) |
| Broche 8 | EN1 — Side-1 enable (active high; tie to VDD1 for always-on) |
| Broche 9 | GND2 — Side-2 ground return |
| Broche 10 | D2 — Output channel D (side 2) |
| Broche 11 | NC — No internal connection (reserved) |
| Broche 12 | C2 — Output channel C (side 2) |
| Broche 13 | B2 — Output channel B (side 2) |
| Broche 14 | A2 — Output channel A (side 2) |
| Broche 15 | EN2 — Side-2 enable (active high; tie to VDD2 for always-on) |
| Broche 16 | VDD2 — Side-2 supply voltage, 2.70 V to 5.5 V |
Applications typiques
SI8442AB-C-IS convient pour 6 applications: I2C / SMBus Isolation, Industrial RS-485 / CAN Isolation, Solar Inverter Power-Stage Isolation, Medical Patient-Isolation Barrier, Isolated SPI for Motor Control, PLC Digital-Input Module.
I2C / SMBus Isolation
The SI8442AB-C-IS isolates I2C and SMBus lines between two ground domains in industrial systems. With 2 forward and 2 reverse channels it carries SDA and SCL bidirectionally, and its 25 kV/µs CMTI rejects ground-noise transients from motors or switch-mode supplies on the far side. Typical insertion is between the controller-side MCU and a remote sensor or EEPROM, with 0.1 µF bypass caps on each VDD and split pull-ups on both sides of the barrier to support open-drain arbitration. The 1 Mbps ceiling covers Standard-mode and Fast-mode I2C as well as 400 kHz SMBus.
Recommandé
Industrial RS-485 / CAN Isolation
The SI8442AB-C-IS provides the digital barrier between a UART/SPI MCU and a bus transceiver like an isolated RS-485 or CAN driver on a high-voltage industrial node. Its 2500 Vrms isolation supports 230 V AC and 400 V DC bus systems, and the wide-body SOIC-16 footprint maintains 8 mm creepage across the barrier per UL 1577. The 1 Mbps ceiling comfortably covers CAN at 1 Mbps and RS-485 at 500 kbps, while 35 ns propagation delay is small relative to one CAN bit time at 1 Mbps. For 5 Mbps CAN-FD or higher-speed RS-485, migrate to the Si8442BB-C-IS or ISO7841 in the same footprint.
Recommandé
Solar Inverter Power-Stage Isolation
In solar inverters the SI8442AB-C-IS isolates the low-voltage control MCU from the high-voltage DC-bus gate drivers and current-sense paths. The device's 25 kV/µs CMTI ensures reliable data transfer even during the high dV/dt switching events of an IGBT or SiC MOSFET bridge. Typical channels carry PWM gate signals, fault flags, and the SPI interface to an isolated gate-driver IC. The wide operating supply range (2.70-5.5 V on both sides) allows the MCU side to run at 3.3 V while the gate-driver side runs at 5 V without level shifters.
Recommandé
Medical Patient-Isolation Barrier
The SI8442AB-C-IS provides 2500 Vrms of reinforced isolation between patient-connected circuitry and the mains-referenced electronics in IEC 60601-1 medical equipment. The Si844x family's UL 1577 and IEC 60747 component recognition simplifies end-system safety certification for patient monitors, infusion pumps, and ECG systems. Each isolation channel carries low-speed serial data such as SPI between the isolated analog front-end and the digital signal processor. The CMOS-based isolation barrier avoids the aging and CTR-degradation issues of optocouplers in long-life medical devices.
Recommandé
Isolated SPI for Motor Control
In a 3-phase motor drive the SI8442AB-C-IS carries SPI traffic between the control MCU and an isolated gate-driver or smart-leg module on each phase. The 1 Mbps ceiling handles 10 MHz SPI clocks comfortably only via slower command/update frames; for full-speed 10 MHz SPI, choose the Si8442BB or ISO7841. The wide-body SOIC-16 footprint places the isolator adjacent to the gate-driver, keeping high-side gate-drive loops short and reducing radiated EMI. The 4 channels cover CS, SCK, MOSI, MISO with margin for a fault-return signal.
Recommandé
PLC Digital-Input Module
In a 24 V industrial PLC digital-input module the SI8442AB-C-IS isolates each field-side input from the backplane logic, providing 2500 Vrms of reinforced isolation and 25 kV/µs CMTI to reject the fast transients of nearby relay and contactor switching. Four channels per IC means a 16-channel input card uses only four SI8442AB-C-IS devices, simplifying BOM. The wide operating voltage range supports 3.3 V and 5 V backplane logic without level shifters, and the wide-body SOIC-16 footprint survives the 8 mm creepage requirement of industrial safety standards.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SI8442AB-C-IS — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SI8442BB-C-IS | SI8442AB-C-ISR | ISO7841DW | ADuM1411ARWZ |
|---|---|---|---|---|---|
| Package | 16-SOIC wide-body (0.295", 7.50 mm) | 16-SOIC wide-body - same | 16-SOIC wide-body - same | 16-SOIC DW wide-body - same | 16-SOIC RW wide-body - same |
| Brand | Skyworks | Skyworks | Skyworks | Texas Instruments | Analog Devices |
| Number of Channels | 4 | 4 | 4 | 4 | 4 |
| Channel Direction | 2F / 2R | 2F / 2R | 2F / 2R | 3F / 1R (configurable) | 3F / 1R (configurable) |
| Isolation Voltage (Vrms) | 2500 | 2500 | 2500 | 2500 | 2500 |
| Max Data Rate | 1 Mbps | 1 Mbps | 1 Mbps | 100 Mbps | 10 Mbps |
| Propagation Delay (typ) | 35 ns | 35 ns | 35 ns | 14 ns | 32 ns |
| CMTI (min) | 25 kV/µs (typ) | 25 kV/µs (typ) | 25 kV/µs (typ) | 25 kV/µs (typ) | 25 kV/µs (typ) |
| Supply Voltage | 2.70 - 5.5 V | 2.70 - 5.5 V | 2.70 - 5.5 V | 2.25 - 5.5 V | 2.7 - 5.5 V |
| Default Output State | High | Low | High | High (default, configurable) | Low (default, configurable) |
| Component Safety Certification | UL 1577, IEC 60747, CSA 5A | UL 1577, IEC 60747, CSA 5A | UL 1577, IEC 60747, CSA 5A | UL 1577, IEC 60747-17, CSA, VDE | UL 1577, CSA, VDE |
Principaux différenciateurs
- RF-isolation barrier eliminates optocoupler aging and CTR degradation (vs Legacy optocouplers (e.g. HCPL-1810))
- Pin-compatible upgrade path to higher data rates without PCB change (vs ISO7841DW (Texas Instruments))
- Wide 2.70-5.5 V supply range on both sides enables level translation (vs ADuM1411ARWZ (Analog Devices))
Notes de conception
Place a 0.1 µF low-ESR ceramic bypass capacitor within 2 mm of each VDD pin (VDD1 pin 1, VDD2 pin 16). Add a 1 µF bulk capacitor on each supply rail. The internal RF carrier draws 5-10 mA peak currents during transitions; without local bypassing, VDD droop will cause data corruption and may violate UL 1577 isolation by allowing barrier overstress. Estimated: at 1 Mbps with all four channels switching, total VDD1+VDD2 supply current reaches approximately 8 mA from a 5 V rail, so a regulator with at least 20 mA headroom is recommended.
Maintain at least 8 mm PCB creepage between any side-1 trace (pins 1-8) and any side-2 trace (pins 9-16) of the wide-body SOIC-16 footprint. Do not route copper, vias, or silkscreen under the package body that bridges the two domains - even a single via under pin 8 compromises the isolation barrier. Skyworks application note AN643 recommends milling a slot in the PCB under the package body for reinforced isolation at 400 V+ working voltages.
Do not enable the side-1 and side-2 channels out of sequence. The SI8442AB-C-IS does not require start-up initialization, but outputs are undefined until VDD1 and VDD2 are both above 2.7 V. If your system requires a deterministic power-up state, hold EN1 and EN2 low during ramp and release simultaneously. Also avoid long input traces (>25 mm) without series termination - the 1.5 ns input edge rate can cause reflections on improperly terminated lines, manifesting as data glitches even at 1 Mbps.
For 1 Mbps operation the SI8442AB-C-IS's 35 ns propagation delay is small compared to the 1000 ns bit time, so channel-to-channel skew (<10 ns) is also negligible. However, if you later migrate to a 100 Mbps Si8442BB or ISO7841 in the same footprint, add 33 Ω series termination at each output to damp reflections on >50 mm PCB traces, and verify that VDD1 and VDD2 decoupling reduces supply ripple to <50 mV peak-peak to keep jitter below 5% UI.
Informations de conformité
RoHS and REACH compliance per Skyworks Si844x datasheet. UL 1577, IEC 60747, and CSA 5A component safety recognition for 2500 Vrms reinforced isolation. AEC-Q100 qualification not applicable - this part is industrial/consumer grade, not automotive.
