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Skyworks Solutions Inc. SI88420EC-ISR
- Part No.:
- SI88420EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88420EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 2CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,994
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Product details
Overview
SI88420EC-ISR from Skyworks Solutions is a dual-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage-to-low-voltage conversion (e.g., 24 V input to 3.3/5.0 V isolated output), supporting up to 2 W average output power and 5000 VRMS isolation. It features two unidirectional CMOS isolation channels, 100 Mbps max data rate, and 23 ns max propagation delay. It is used in industrial motor control and EV inverter gate drive circuits requiring reinforced insulation and compact isolated power.
For engineers reviewing the SI88420EC-ISR datasheet, SI88420EC-ISR pinout, SI88420EC-ISR application, or SI88420EC-ISR equivalent, this page delivers verified specifications, SOIC-20 wide-body package mapping, functional pin roles, automotive-grade AEC-Q100 qualification, and real-world design context for isolated power + signal transfer in high-noise environments.
Technical Context
The SI88420EC-ISR implements a modified flyback DC-DC topology with external NMOS switch drive via ESW pin and primary-side current sensing via RSN pin, enabling operation with input voltages up to 24 V. Its digital isolation uses RF on/off keying across a silicon dioxide capacitive barrier, delivering 100 kV/µs typical transient immunity and no startup initialization.
Unlike Si882xx/3xx variants, SI88420EC-ISR lacks SH/SH_FC and SS pins - shutdown and soft-start are not supported. It uses fixed 250 kHz switching frequency and requires Type 1 loop compensation at COMP pin with RCOMP = 100 kΩ, matching internal resistance for stable regulation of isolated output voltage sensed via VSNS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for one minute - meets UL 1577, CSA 62368-1, VDE 62368-1, and CQC GB4943.1 reinforced insulation requirements. |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces like SPI, RS-485, and CAN FD in isolated domains. |
| Propagation Delay | 23 ns max - enables precise timing-critical applications such as gate driver synchronization and ADC sampling isolation. |
| DC-DC Output Power | 2 W average at 5.0 V - sufficient to power secondary-side logic (VDDB) and small external loads without discrete regulators. |
| Input Voltage Range | Up to 24 V on primary side - supports industrial and automotive HV bus domains; VDDA must be ≤ 5.5 V. |
| Operating Temperature | –40 °C to +125 °C - qualified per AEC-Q100 Grade 1, suitable for under-hood and factory-floor environments. |
| Transient Immunity | 100 kV/µs typical - ensures robust operation in high-dv/dt noise environments like motor drives and inverters. |
Pinout & Package
SI88420EC-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 15.4 mm, 1.27 mm pitch) with creepage/clearance ≥ 8.3 mm, certified for reinforced insulation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | VDDA, GNDA, A1, A2, RSN, ESW | Primary-side signal supply (VDDA), ground (GNDA), two forward digital inputs (A1/A2), external switch driver (ESW), and current sense (RSN) for high-voltage DC-DC operation. |
| 7, 8, 9, 10, 11 | GNDP, VREGA, VDDP, VSW, VSNS | Power-stage ground (GNDP), internal voltage reference (VREGA), primary power supply (VDDP), internal switch output (VSW), and feedback input (VSNS) for closed-loop regulation. |
| 12, 13, 14, 15, 16 | GNDB, VDDB, B1, B2, COMP | Secondary-side ground (GNDB), isolated signal supply (VDDB), two reverse digital outputs (B1/B2), and compensation node (COMP) for stability tuning. |
| 17, 18, 19, 20 | NC, NC, DNC/VREGB, NC | No-connect pins; VREGB is internally zenered and Do-Not-Connect when output ≤ 5.5 V - prevents unintended biasing of external regulators. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC with external FET drive | ESW pin drives external NMOS switch; RSN pin enables peak-current-mode control for 24 V input → 3.3/5.0 V isolated output. |
| Capacitive RF isolation architecture | On/off keying across SiO₂ barrier eliminates magnetic coupling issues and provides 100 kV/µs common-mode transient immunity. |
| Secondary-side voltage sensing | VSNS feedback path eliminates optocouplers and external bias circuitry, improving load regulation and long-term reliability. |
| Fixed-frequency 250 kHz PWM | No external frequency programming required - simplifies layout and EMI filtering vs. adjustable-frequency variants (Si883xx/Si886xx). |
| AEC-Q100 Grade 1 qualification | Validated for automotive use including PPAP documentation support, IMDS/CAMDS compliance, and extended temperature operation. |
Applications
| Industrial Motor Control | EV Inverter Gate Drive |
|---|---|
Use Scenario: Isolating PWM signals and feedback from MCU to IGBT/SiC gate drivers in variable-frequency drives. IC Role / Device Role / Timing Role: SI88420EC-ISR provides dual-channel signal isolation plus local 5 V rail for gate driver ICs, eliminating separate isolated DC-DC modules. Use Value: Reduces BOM count by integrating power and signal isolation; 23 ns prop delay enables tight timing alignment between phase legs. |
Use Scenario: Transmitting isolated current-sense and fault signals from high-side shunt amplifiers to vehicle controller units in traction inverters. IC Role / Device Role / Timing Role: SI88420EC-ISR isolates analog front-end outputs while powering downstream comparators and ADC references via VDDB. Use Value: 5000 VRMS rating meets ISO 26262 ASIL-C requirements; –40 °C to +125 °C range supports under-hood deployment. |
| Programmable Logic Controllers | Isolated Data Acquisition |
Use Scenario: Digitally isolating field I/O signals (e.g., 24 V digital inputs) and powering isolated sensor interface circuitry in PLC backplanes. IC Role / Device Role / Timing Role: SI88420EC-ISR serves as both signal isolator and local 3.3 V supply for isolated ADCs and level translators. Use Value: SOIC-20 wide-body footprint enables >8 mm creepage; eliminates need for external DC-DC converters and reduces PCB layer count. |
Use Scenario: Isolating high-resolution sigma-delta ADC outputs (e.g., ADS131M04) in industrial test equipment with floating sensor grounds. IC Role / Device Role / Timing Role: SI88420EC-ISR transmits synchronized sample clocks and data while supplying clean, regulated VDDB to ADC digital core. Use Value: 100 Mbps capability supports oversampled data streams; low jitter (<1 ns RMS) preserves SNR in precision measurement systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel isolated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88421EC-ISR | One forward (A1→B1) + one reverse (A2←B2) channel configuration; same SOIC-20 package and DC-DC specs. | Required when bidirectional signal flow (e.g., UART RX/TX) is needed across isolation barrier instead of dual unidirectional. | Select SI88421EC-ISR only if asymmetric channel directionality matches system protocol stack - SI88420EC-ISR is optimal for two independent forward links. |
| ADUM6420ARWZ | Analog Devices part with 4 isolated channels, integrated 500 mW DC-DC, SOIC-20 package, but lower 5000 VRMS isolation and no AEC-Q100 qualification. | Suitable for non-automotive industrial systems where channel count >2 and lower power suffice, but not for ASIL-B/C designs. | Choose ADUM6420ARWZ only for cost-sensitive, non-automotive applications needing four channels; SI88420EC-ISR offers higher power, automotive grade, and superior EMI immunity. |
Compared with SI88420EC-ISR, SI88421EC-ISR provides flexible bidirectional signaling at identical power and isolation performance, while ADUM6420ARWZ trades off automotive qualification and 2 W output for higher channel density and lower cost in less demanding environments.
Availability
SI88420EC-ISR is available at Aetrix Electronics and suitable for industrial motor control, EV inverter gate drive, and isolated data acquisition requiring stable component supply, long-lifecycle assurance, and automotive-grade traceability.
Supply support for SI88420EC-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 wireless, automotive, and industrial markets.
The Si88x2x family - including SI88420EC-ISR - was engineered specifically for high-reliability isolated power + signal transfer in harsh environments, targeting automotive traction inverters, industrial PLCs, and energy infrastructure where safety certification and thermal robustness are mandatory.
FAQ
What is the maximum isolated output power of the SI88420EC-ISR?
The SI88420EC-ISR delivers up to 2 W average output power at 5.0 V on the isolated side. This is sufficient to power secondary-side logic (e.g., gate drivers, ADCs, comparators) and small auxiliary loads. Peak power capability exceeds 5 W, but sustained operation is rated at 2 W due to thermal limits in the SOIC-20 package. The SI88420EC-ISR achieves this using an external NMOS switch driven by the ESW pin and current sensing via RSN.
Does the SI88420EC-ISR support shutdown or soft-start functionality?
No, the SI88420EC-ISR does not support shutdown or soft-start. Unlike Si883xx/Si886xx variants, it omits SH/SH_FC and SS pins entirely. Its DC-DC converter operates continuously once VDDP and VDDA rise above UVLO thresholds. Startup behavior is governed solely by undervoltage lockout (UVLO) on both sides, with no user-controllable sequencing or inrush limiting.
Which transformer part numbers are validated for use with the SI88420EC-ISR?
Validated transformers include UMEC UTB02250s (7–24 V input, 3.3–5.5 V output, 3.0:1 turns ratio, 5 kVRMS), Coilcraft TA7788-AL (12 V input, 5/15 V output), and Pulse PA4897NL (8–24 V input/output, 1.0:1, 5 kVRMS). All meet leakage inductance, primary inductance, and isolation rating requirements specified in Skyworks AN901. Transformer selection must match input voltage, output voltage, and required isolation level.
Can the SI88420EC-ISR be used for high-voltage-to-high-voltage conversion?
Yes, the SI88420EC-ISR supports high-voltage-to-high-voltage configurations - for example, 24 V input to 24 V isolated output - using external components including Q1 (NMOS switch), R4 (current sense resistor), D1 (Schottky diode), and T1 (custom transformer). The DC-DC controller regulates output via VSNS feedback, and VREGB remains DNC since output ≤ 5.5 V is not applicable in this mode.
What is the purpose of the VREGA pin on the SI88420EC-ISR?
The VREGA pin provides an internal voltage reference (typically 1.25 V) used with an external NPN transistor, resistor, and capacitor to generate a regulated VDDA supply when no suitable ≤5.5 V source exists on the primary side. This eliminates the need for a separate linear regulator. VREGA must not be loaded directly - it is intended solely as a reference for external bias circuitry feeding VDDA.
SI88420EC-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:
- 2/0
- 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
SI88420EC-ISR FAQ
1.How can I place an order for SI88420EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88420EC-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 SI88420EC-ISR reliable?
The price and inventory of SI88420EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88420EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88420EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88420EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88420EC-ISR?
SI88420EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88420EC-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 SI88420EC-ISR?
For technical support, including SI88420EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88420EC-ISR requirements.
6.How does Aetrix verify that SI88420EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88420EC-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 SI88420EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88420EC-ISR?
All SI88420EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88420EC-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 SI88420EC-ISR part is unused and in its original packaging.
Return procedure for SI88420EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88420EC-ISR Tags
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