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Skyworks Solutions Inc. SI88422BC-ISR
- Part No.:
- SI88422BC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88422BC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,618
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Product details
Overview
SI88422BC-ISR from Skyworks Solutions is a dual-channel digital isolator with integrated isolated DC-DC converter optimized for high-voltage-to-low-voltage conversion (e.g., 24 V input to 3.3/5.0 V isolated output), delivering up to 2 W average isolated power, supporting data rates up to 100 Mbps, and achieving propagation delay as low as 18 ns typical. It serves as a complete signal + power isolation solution in industrial motor control and EV inverter gate driver interfaces.
For engineers reviewing the SI88422BC-ISR datasheet, SI88422BC-ISR pinout, SI88422BC-ISR application, or SI88422BC-ISR equivalent, this page delivers verified specifications, SOIC-16 wide-body package mapping, confirmed A1/A2/B1/B2 channel configuration, isolation barrier voltage (5000 VRMS), and two validated alternative parts with documented functional and application differences.
Technical Context
The SI88422BC-ISR implements RF-based capacitive isolation across a silicon dioxide barrier, using on/off keying modulation for superior noise immunity and magnetic field rejection. Its digital channels operate independently with no initialization required and support fail-safe default states.
Its isolated DC-DC converter uses a modified flyback topology with external primary-side NMOS switch driven by ESW, current sensing via RSN, and secondary-side feedback through VSNS/COMP. It supports 24 V primary-side input and delivers regulated 3.3 V or 5.0 V on the isolated side, with thermal shutdown, cycle skipping at light loads, and Type 1 loop compensation (RCOMP = 100 kΩ).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5000 VRMS for 1 minute - meets reinforced insulation requirements per UL 1577, CSA 62368-1, and VDE 62368-1. |
| Data Rate | Up to 100 Mbps - enables high-speed serial communication (e.g., SPI, RS-485) across isolation barrier without timing bottlenecks. |
| Propagation Delay | 18 ns typical, 23 ns max - ensures tight timing alignment critical for gate driver synchronization and real-time control loops. |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power secondary-side logic (e.g., MCU I/O, ADC reference, gate driver bias) without external regulators. |
| Transient Immunity | 100 kV/µs typical - maintains signal integrity during fast-switching events in motor drives and inverters. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and industrial environments with extended thermal stress. |
| AEC-Q100 Grade | Qualified - supports automotive-grade reliability with PPAP documentation and IMDS/CAMDS compliance. |
Pinout & Package
SI88422BC-ISR is housed in a RoHS-compliant SOIC-16 wide-body package (10.3 mm × 10.3 mm, 1.27 mm pitch) with creepage/clearance ≥ 8.3 mm, rated for 5000 VRMS isolation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | HF XMTR | High-frequency transmitter inputs for Channel A1 and A2 - drive RF carrier modulated by primary-side digital signals. |
| 3, 4 | HF RCVR | High-frequency receiver outputs for Channel B1 and B2 - demodulate RF signal to reconstruct isolated digital outputs. |
| 5 | GNDP | Primary-side power ground - return path for internal switch and ESW driver; must be short-traced to VDDP. |
| 6 | RSN | Current sense input - monitors primary-side switch current for peak-current-mode control and overcurrent protection. |
| 7 | ESW | External switch driver output - actively drives external NMOS FET (Q1) in high-voltage flyback configuration. |
| 8 | VDDA | Primary-side signal supply - powers digital input buffers and internal logic; requires ≤5.5 V (e.g., 3.3 V or 5 V rail). |
| 9 | GNDA | Primary-side signal ground - reference for A1/A2 inputs and VDDA; separate from GNDP per isolation requirements. |
| 10 | VREGA | Voltage reference output - used with external NPN transistor to generate VDDA when primary supply >5.5 V. |
| 11 | GNDB | Secondary-side signal ground - reference for B1/B2 outputs and VDDB; galvanically isolated from GNDA/GNDP. |
| 12 | VDDB | Secondary-side signal supply - powered by isolated DC-DC output; supplies isolated logic (e.g., microcontroller I/O). |
| 13 | VSNS | Feedback sense input - receives resistor-divider voltage from isolated output to enable precise closed-loop regulation. |
| 14 | COMP | Compensation node - connects external RCOMP (100 kΩ) and CCOMP to stabilize flyback control loop (Type 1). |
| 15, 16 | NC | No-connect pins - internally unconnected; must remain floating per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based capacitive isolation | Eliminates optocoupler aging and temperature drift; achieves 100 kV/µs CMTI without external filtering. |
| Integrated flyback DC-DC controller | Supports 24 V primary input with external NMOS switch (ESW-driven), enabling high-efficiency isolated power without optocoupler feedback. |
| Secondary-side voltage sensing | VSNS feedback directly on isolated side ensures ±1% load/line regulation - no optocoupler biasing or secondary LDO needed. |
| Automotive-grade qualification | AEC-Q100 qualified with PPAP support and IMDS/CAMDS listings - suitable for ASIL-B system-level designs. |
| Thermal and cycle-skipping protection | Internal thermal shutdown prevents damage at Tj >150 °C; cycle skipping reduces switching losses below ~20% load. |
Applications
| Industrial Motor Control | EV Inverter Gate Driver Interface |
|---|---|
|
Use Scenario: Isolating PWM signals and fault feedback between MCU and IGBT/SiC gate drivers in variable-frequency drives. IC Role / Device Role / Timing Role: SI88422BC-ISR provides dual-channel signal isolation plus local 5 V bias for gate driver ICs, replacing discrete isolators + isolated DC-DC modules. Use Value: Eliminates external optocouplers and isolated buck converters, reducing BOM count by ≥4 components while maintaining 18 ns timing alignment. |
Use Scenario: Providing isolated power and signal paths for phase-leg current sensing and desaturation detection in traction inverters. IC Role / Device Role / Timing Role: SI88422BC-ISR delivers isolated 3.3 V for ADC references and 5 V for comparator bias, synchronized with isolated current-sense signals. Use Value: Enables single-package isolation of both analog sensing and digital control signals - critical for meeting ISO 26262 ASIL-C timing constraints. |
| Programmable Logic Controller (PLC) I/O Modules | Isolated Industrial Ethernet Node |
|
Use Scenario: Digitally isolating digital input/output lines and powering isolated field-side logic in modular PLC backplanes. IC Role / Device Role / Timing Role: SI88422BC-ISR isolates two digital I/O channels while supplying 2 W to field-side microcontrollers and level shifters. Use Value: Reduces footprint vs. discrete isolator + isolated DC-DC solution by >40%, simplifying thermal management in dense I/O modules. |
Use Scenario: Isolating Ethernet PHY interface signals (MDIO, TX_EN) and powering isolated PHY side in industrial switches/routers. IC Role / Device Role / Timing Role: SI88422BC-ISR provides bidirectional signal isolation and 3.3 V isolated supply for PHY transceivers compliant with IEEE 802.3. Use Value: Meets IEC 61000-4-5 surge immunity requirements (±4 kV) while eliminating need for external isolated DC-DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital isolator with integrated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM6421AARIZ-RL | 4-channel isolator, integrated 500 mW DC-DC (no external switch), SOIC-20 package, 2500 VRMS isolation. | Limited to ≤5 V input; insufficient power for gate driver bias; not AEC-Q100 qualified. | Select when only 500 mW isolated power is needed and space allows larger SOIC-20 footprint. |
| SI88622BC-ISR | Same Si88x2x family, SOIC-20 package, adds programmable soft-start (SS) and frequency control (SH_FC) pins. | Requires additional external RC network for soft-start/frequency tuning; higher pin count increases layout complexity. | Select when design requires adjustable startup behavior or EMI optimization via frequency dithering - otherwise SI88422BC-ISR offers simpler implementation. |
Compared with ADUM6421AARIZ-RL and SI88622BC-ISR, SI88422BC-ISR uniquely balances 2 W isolated power delivery, 24 V input capability, AEC-Q100 qualification, and minimal external component count in SOIC-16 - making it optimal for space-constrained automotive and industrial gate driver applications where external FET control is acceptable.
Availability
SI88422BC-ISR is available at Aetrix Electronics and suitable for industrial motor control, EV inverter subsystems, and PLC I/O modules requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI88422BC-ISR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Skyworks Solutions is a global semiconductor company specializing in analog and mixed-signal connectivity solutions, with leadership in RF, timing, and isolation technologies for high-reliability applications.
The Si88x2x product line was designed specifically to replace optocoupler-based isolation + discrete DC-DC architectures in industrial automation, electric vehicle power systems, and safety-critical control equipment - emphasizing integration, reliability, and regulatory compliance.
FAQ
What is the maximum isolated output power supported by SI88422BC-ISR?
SI88422BC-ISR delivers up to 2 W average isolated output power at 5.0 V, sufficient to power secondary-side logic such as gate driver ICs, microcontroller I/O banks, or ADC references. Peak power capability exceeds 5 W briefly, but sustained operation is rated at 2 W due to thermal limits in the SOIC-16 package. The device achieves this using an external NMOS switch driven by the ESW pin and secondary-side feedback via VSNS.
Does SI88422BC-ISR support 24 V primary-side input?
Yes, SI88422BC-ISR is explicitly designed for high-voltage-to-low-voltage configurations, including 24 V primary-side input to 3.3 V or 5.0 V isolated output. It uses an external NMOS FET driven by the ESW pin and current sensing via RSN to safely manage higher primary-side voltages - unlike Si882xx/3xx variants that integrate internal switches limited to ≤5.5 V input.
What isolation certifications does SI88422BC-ISR hold?
SI88422BC-ISR is certified to UL 1577 (5000 VRMS, 1 min), CSA 62368-1 (reinforced insulation), VDE 62368-1 (conformity), and CQC GB4943.1. It also meets VDE 60747-17 for basic insulation (pending final approval). These certifications validate its suitability for safety-critical industrial and automotive applications requiring reinforced insulation barriers.
How does SI88422BC-ISR achieve precise output voltage regulation?
SI88422BC-ISR uses secondary-side voltage sensing: the isolated output is divided by external resistors (R1/R2) and fed into the VSNS pin. The error amplifier compares this to an internal reference and encodes the error, transmitting it across the isolation barrier to adjust the duty cycle of the external NMOS switch. This eliminates optocoupler-based feedback, improving line/load regulation to ±1%.
Is SI88422BC-ISR pin-compatible with other Si88x2x devices?
No, SI88422BC-ISR is not pin-compatible with Si882xx or Si883xx variants due to different pin functions (e.g., ESW/RSN instead of SH/SS) and absence of shutdown/soft-start pins. It shares pinout with SI88420 and SI88421 in the same Si8842x subgroup, but differs from SI8862x which adds SH_FC and SS pins in SOIC-20. Always verify pin mapping against Figure 3 in the datasheet before PCB layout.
SI88422BC-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- No
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 0/2
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 40kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 18ns, 23ns
- Pulse Width Distortion (Max):
- 7ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI88422BC-ISR FAQ
1.How can I place an order for SI88422BC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88422BC-ISR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SI88422BC-ISR reliable?
The price and inventory of SI88422BC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88422BC-ISR is usually 5 days.
3.What payment methods are accepted for SI88422BC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88422BC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88422BC-ISR?
SI88422BC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88422BC-ISR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SI88422BC-ISR?
For technical support, including SI88422BC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88422BC-ISR requirements.
6.How does Aetrix verify that SI88422BC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88422BC-ISR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SI88422BC-ISR meets industry standards.
7.What is the process for return or replacement of SI88422BC-ISR?
All SI88422BC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88422BC-ISR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SI88422BC-ISR part is unused and in its original packaging.
Return procedure for SI88422BC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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