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Skyworks Solutions Inc. SI88640EC-ISR
- Part No.:
- SI88640EC-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88640EC-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,050
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Product details
Overview
SI88640EC-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter optimized for high-voltage input (up to 24 V) to low-voltage output (3.3/5.0 V) conversion. It delivers up to 2 W average isolated power, supports data rates up to 100 Mbps, achieves 18 ns typical propagation delay, and provides 5000 VRMS reinforced isolation. It is used in battery management systems and traction inverters where primary-side voltage exceeds 5.5 V.
For engineers reviewing the SI88640EC-ISR datasheet, SI88640EC-ISR pinout, SI88640EC-ISR application, or SI88640EC-ISR equivalent, this page details its high-voltage flyback topology, external FET driver capability (ESW), programmable soft-start (SS), frequency control (SH_FC), and secondary-side feedback architecture - all critical for automotive and industrial isolated power + signal integrity designs.
Technical Context
The SI88640EC-ISR implements a modified isolated flyback DC-DC controller with external primary-side NMOS switch drive via ESW and current sensing via RSN. Its peak-current-mode control loop uses VSNS for secondary-side voltage feedback and COMP for type-1 compensation (RCOMP = 100 kΩ).
It features four unidirectional RF-based isolation channels using capacitive SiO₂ barriers, each operating as a high-noise-immunity on/off-keyed buffer. The device requires no initialization and supports failsafe output modes, with A1–A4 and B1–B4 providing galvanically isolated digital I/O across the barrier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute (UL 1577, VDE 62368-1 reinforced) |
| Data Rate | Up to 100 Mbps - enables real-time control loop signaling in motor drives |
| Propagation Delay | 18 ns typical - ensures tight timing alignment between isolated control signals |
| DC-DC Output Power | 2 W average at 5 V - sufficient to power secondary-side MCU, ADC, and gate drivers |
| Input Voltage Range | Up to 24 V on primary side - supports direct connection to automotive battery rails |
| Transient Immunity | 100 kV/µs (typical) - maintains signal integrity during fast-switching EMI events |
| Operating Temp | –40 °C to +125 °C - qualified for under-hood automotive and industrial environments |
Pinout & Package
SI88640EC-ISR is housed in a RoHS-compliant SOIC-24 wide-body package (15.4 mm × 7.5 mm, 1.27 mm pitch) with creepage/clearance ≥ 8.3 mm for reinforced insulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | VDDA, GNDA, RSN, ESW, VREGA, RSN | Primary-side analog supply, ground, current sense input, external switch driver, and voltage reference for VDDA regulation |
| 7, 8, 17, 18 | SH_FC, SS, NC, NC | Shutdown/frequency control (active-high), soft-start capacitor interface, and no-connect pins |
| 9–16 | A1–A4, B1–B4 | Four unidirectional isolated I/O channels: A-side inputs, B-side outputs |
| 19–24 | VDDP, GNDP, VSNS, COMP, VDDB, GNDB | DC-DC primary power/ground, secondary-side feedback input, compensation node, and isolated secondary supply/ground |
Key Features
| Feature | Design Value |
|---|---|
| External FET driver (ESW) | Enables high-voltage primary operation (>5.5 V) with user-selected MOSFET for improved efficiency and thermal margin |
| Secondary-side feedback (VSNS) | Eliminates optocouplers and associated bias circuitry, improving long-term stability and reducing BOM count |
| Programmable soft start (SS) | Controls inrush current via external capacitor - prevents input rail sag during power-up in battery-fed systems |
| Adjustable switching frequency (SH_FC) | 200–800 kHz tuning via external RC - allows EMI optimization without changing transformer or layout |
| AEC-Q100 qualified | Validated for automotive applications including BMS and traction inverters per Grade 1 temperature requirements |
Applications
| Battery Management System (BMS) | Traction Inverter Control |
|---|---|
|
Use Scenario: Isolated monitoring of cell voltages and temperatures in 400–800 V EV battery packs. IC Role / Device Role / Timing Role: Provides galvanic separation between high-voltage battery stack and low-voltage MCU, while powering isolated ADCs and communication interfaces. Use Value: Enables accurate, noise-immune sensing with single-component isolated power + signal transfer - eliminating separate DC-DC and isolator ICs. |
Use Scenario: Gate driving and fault reporting for IGBTs/MOSFETs in 3-phase motor inverters. IC Role / Device Role / Timing Role: Delivers isolated 5 V power and PWM signal transmission with <18 ns prop delay to ensure precise dead-time control. Use Value: Reduces timing skew and improves system reliability by integrating power and signal isolation in one SOIC-24 footprint. |
| Industrial PLC Analog I/O Module | Medical Patient Monitoring Isolation Barrier |
|
Use Scenario: Isolating 4–20 mA current loop inputs and SPI-based ADCs in factory automation controllers. IC Role / Device Role / Timing Role: Supplies isolated 3.3 V to ADC and microcontroller while transmitting configuration and data across the barrier. Use Value: Meets IEC 61000-4-5 surge immunity and reinforced isolation requirements without external regulators or optocouplers. |
Use Scenario: Separating patient-connected ECG/EEG front-end circuits from hospital-grade mains-powered processing units. IC Role / Device Role / Timing Role: Provides certified 5000 VRMS isolation and low-emission operation to meet IEC 60601-1 3rd edition safety standards. Use Value: Achieves creepage/clearance compliance and ultra-low emissions (<10 dBµV @ 150 kHz–30 MHz) without shielding or filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital isolator with integrated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88641EC-ISR | Same SOIC-24 package and pinout; differs only in default failsafe state (high vs low) on isolated outputs during power loss | Suitable when active-high default output is required for fail-safe gate driver enable logic | Select SI88641EC-ISR if system-level safety mandates high-state default on B1–B4 during VDDB undervoltage |
| ADUM6420ARWZ | SOIC-24, 4-channel, 5000 VRMS isolation, but uses internal switches (no ESW/RSN) and max 2 W output at 5 V - no high-voltage primary support | Limited to ≤5.5 V primary input; unsuitable for direct 24 V battery rail connection without pre-regulation | Choose ADUM6420ARWZ only for low-voltage industrial systems where external DC-DC pre-regulation is already present |
Compared with SI88640EC-ISR, SI88641EC-ISR offers identical high-voltage DC-DC architecture but inverted failsafe behavior, while ADUM6420ARWZ lacks external switch drive and cannot accept >5.5 V primary input - making SI88640EC-ISR uniquely suited for direct 24 V automotive integration without additional power stages.
Availability
SI88640EC-ISR is available at Aetrix Electronics and suitable for battery management systems, traction inverters, industrial PLCs, and medical isolation barriers requiring stable component supply, automotive qualification, and reinforced 5000 VRMS isolation.
Supply support for SI88640EC-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.
The Si88x4x family was designed specifically for high-reliability automotive and industrial applications requiring integrated isolated power and signal transfer - eliminating discrete DC-DC + isolator combinations and reducing system size, cost, and validation effort.
FAQ
What is the maximum primary-side input voltage supported by the SI88640EC-ISR?
The SI88640EC-ISR is designed for high-voltage DC-DC operation and supports primary-side input voltages up to 24 V. Its ESW pin drives an external NMOS switch, and RSN provides current sensing - enabling robust operation directly from automotive battery rails without pre-regulation. This distinguishes SI88640EC-ISR from low-voltage variants like Si882xx/3xx, which are limited to ≤5.5 V input.
Does the SI88640EC-ISR require external components for DC-DC operation?
Yes, the SI88640EC-ISR requires external components for DC-DC functionality: an external NMOS switch (driven by ESW), current-sense resistor (connected to RSN), transformer (e.g., UMEC UTB02250s), rectifying diode, input/output capacitors, and feedback resistors (R1/R2) for VSNS. Unlike Si882xx/3xx, it does not integrate power switches - enabling higher primary-side voltage handling and thermal flexibility.
What is the purpose of the SH_FC and SS pins on the SI88640EC-ISR?
On the SI88640EC-ISR, SH_FC (pin 7) controls shutdown and switching frequency, while SS (pin 8) sets soft-start timing via an external capacitor. Asserting SH_FC high disables the DC-DC converter; configuring an RC network between SH_FC and SS adjusts frequency from 200–800 kHz. SS capacitor value determines inrush current ramp rate - critical for preventing voltage droop in battery-powered systems during startup.
How does the SI88640EC-ISR achieve secondary-side voltage regulation without optocouplers?
The SI88640EC-ISR uses an internal error amplifier that compares the VSNS feedback voltage (derived from a resistor divider across VDDB) to a precision internal reference. The resulting error signal is encoded and transmitted across the capacitive isolation barrier to the primary-side controller, which adjusts duty cycle accordingly. This closed-loop architecture eliminates optocouplers, reducing drift, aging, and component count while improving line/load regulation.
Is the SI88640EC-ISR qualified for automotive applications?
Yes, the SI88640EC-ISR is AEC-Q100 qualified (Grade 1: –40 °C to +125 °C) and certified to UL 1577 (5000 VRMS), VDE 62368-1, and CSA 62368-1 for reinforced insulation. It is explicitly listed in Skyworks documentation for hybrid/electric vehicle applications including battery management systems and traction inverters, with AIAG-compliant PPAP and IMDS support available.
SI88640EC-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 24-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:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- 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:
- 24-SOIC
SI88640EC-ISR FAQ
1.How can I place an order for SI88640EC-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88640EC-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 SI88640EC-ISR reliable?
The price and inventory of SI88640EC-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88640EC-ISR is usually 5 days.
3.What payment methods are accepted for SI88640EC-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88640EC-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88640EC-ISR?
SI88640EC-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88640EC-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 SI88640EC-ISR?
For technical support, including SI88640EC-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88640EC-ISR requirements.
6.How does Aetrix verify that SI88640EC-ISR is sourced from the original manufacturer or authorized distributors?
All SI88640EC-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 SI88640EC-ISR meets industry standards.
7.What is the process for return or replacement of SI88640EC-ISR?
All SI88640EC-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88640EC-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 SI88640EC-ISR part is unused and in its original packaging.
Return procedure for SI88640EC-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88640EC-ISR Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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