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Skyworks Solutions Inc. SI8640ET-ISR
- Part No.:
- SI8640ET-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8640ET-ISR.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,869
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Product details
Overview
SI8640ET-ISR from Skyworks is a quad-channel, unidirectional digital isolator with 4 input channels on VDD1 side and 0 on VDD2 side, rated for 5.0 kVRMS reinforced isolation, 150 Mbps data rate, and –40 to 125 °C operation. It features Schmitt-trigger inputs, tri-state outputs controlled by a single enable pin (EN), and selectable high-default fail-safe mode - deployed in isolated motor control gate drivers and battery management system signal interfaces.
For engineers reviewing the SI8640ET-ISR datasheet, SI8640ET-ISR pinout, SI8640ET-ISR application, or SI8640ET-ISR equivalent, key selection criteria include its 5.0 kVRMS reinforced VDE 0884-10 certification, 8.0 ns typical propagation delay, 0.5 ns channel-channel skew, 50 kV/µs CMTI, and SOIC-16 wide-body package with 8 mm creepage.
Technical Context
The SI8640ET-ISR implements RF-based on/off keying across a silicon-die isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical degradation. Its architecture supports independent undervoltage lockout (UVLO) on both sides, with VDDUV+ = 2.24 V (typ) and hysteresis of 70 mV (typ).
All four channels are input-only on Side A (VDD1), driving outputs on Side B (VDD2); EN is located on Side B and controls all four outputs simultaneously. The device uses internal 10 µA pull-ups on inputs/outputs to enforce high-default state during power loss - confirmed for ET-suffix ordering options.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | DC to 150 Mbps - supports high-speed SPI, RS-485, and PWM feedback in inverters without timing bottlenecks. |
| Propagation Delay | 5.0–13 ns (max) - enables sub-10 ns timing-critical gate drive synchronization in SiC/GaN power stages. |
| Channel-Channel Skew | 0.4–2.5 ns (max) - ensures matched timing across all four isolated signals for multi-phase motor control. |
| CMTI | 60 kV/µs (typ), 100 kV/µs (max) - maintains signal integrity in high dv/dt environments like traction inverters. |
| Isolation Rating | 5.0 kVRMS reinforced - certified to VDE 0884-10 and UL 1577, supporting 8 mm creepage in WB SOIC-16 package. |
| Supply Voltage | 2.375–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Fail-Safe Default | High - output pins default to logic high during VDD1 loss, critical for safe shutdown in BMS fault detection paths. |
Pinout & Package
SI8640ET-ISR is housed in a RoHS-compliant 16-pin wide-body SOIC (-IS) package with 8 mm creepage, 10.3 mm body width, and JEDEC-standard 260 °C reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies power to input logic and RF transmitter; must be bypassed with 0.1 µF capacitor. |
| GND1 | Input-side ground reference | Return path for VDD1; requires low-inductance connection to isolate noise coupling into isolation barrier. |
| INA1–INA4 | Input channels A1–A4 | CMOS/Schmitt-trigger inputs accepting 2.0–5.5 V logic; no external pull-up required due to internal 10 µA pull-ups. |
| VDD2 | Output-side power supply | Supplies power to RF receiver and output drivers; independent of VDD1 for true galvanic isolation. |
| GND2 | Output-side ground reference | Isolated return for VDD2; must be physically separated from GND1 per creepage/clearance rules. |
| EN | Enable control input | Active-high signal on Side B; drives all four outputs into high-impedance when low - used for system-level output gating. |
| OUTB1–OUTB4 | Output channels B1–B4 | CMOS outputs with ~50 Ω impedance; support 4 mA sink/source at 0.4 V VOL / 4.8 V VOH (5 V supply). |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Validated 10 kV surge capability and 60-year lifetime at rated working voltage - meets IEC 60601-1 and 62368-1 for medical and industrial safety compliance. |
| Tri-state output control via EN | Single-pin global disable of all four outputs reduces PCB routing complexity and enables shared bus architectures. |
| High-default fail-safe mode | Guaranteed logic-high output during VDD1 loss - eliminates need for external pull-ups in safety-critical BMS and OBC monitoring circuits. |
| Ultra-low power at 100 Mbps | 5.5 mA per channel at 5 V / 100 Mbps - cuts isolated interface power by >40% vs. legacy optocouplers in high-data-rate applications. |
| Sub-10 ns propagation delay | 8.0 ns typical tPLH/tPHL - enables real-time closed-loop control in 20+ kHz motor drives without added latency. |
Applications
| Motor Control Interface | Battery Management System |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current sense feedback between MCU and three-phase inverter stage in EV traction inverters. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting high-speed PWM edges and ADC status flags across isolation barrier with <2.5 ns skew. Use Value: Enables precise synchronous switching of SiC MOSFETs while maintaining 60 kV/µs CMTI immunity against 1000 V/ns bus transients. | Use Scenario: Monitoring cell voltage and temperature sensor outputs from high-voltage battery pack (up to 900 V) to low-voltage MCU domain in BEV battery packs. IC Role / Device Role / Timing Role: Providing reinforced 5.0 kVRMS isolation for analog front-end data acquisition lines and fault-reporting digital signals. Use Value: Meets reinforced insulation requirements per IEC 61508 SIL-3 and ISO 26262 ASIL-D through VDE 0884-10 certification and 8 mm creepage. |
| On-Board Charger | Industrial PLC I/O Module |
Use Scenario: Isolating communication lines (UART, CAN) and AC line sensing signals between primary-side controller and secondary-side MCU in bidirectional OBCs. IC Role / Device Role / Timing Role: Delivering fail-safe high-default outputs for AC fault detection signals to ensure immediate shutdown on primary-side power loss. Use Value: Eliminates external pull-up resistors and reduces BOM count while guaranteeing safe state transition during brownout conditions. | Use Scenario: Isolating digital input/output signals between field-side 24 V DC sensors/actuators and 3.3 V logic in modular PLC backplanes. IC Role / Device Role / Timing Role: Replacing four discrete optocouplers with one quad-channel isolator to reduce footprint and improve channel matching. Use Value: Achieves 4× smaller PCB area vs. SOIC-8 optocoupler solutions and improves timing consistency with <0.5 ns channel skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM2402ARWZ | 4-channel, 25 Mbps max data rate; 2.5–5.5 V supply; 2.5 kVRMS basic isolation; no VDE 0884-10 reinforcement. | Limited to non-safety-critical industrial I/O where 150 Mbps and reinforced certification are not required. | Select when cost sensitivity outweighs speed/safety needs and 2.5 kVRMS suffices. |
| ISO6741QDWR | 4-channel, 50 Mbps max; 3.0–5.5 V supply; 5.0 kVRMS reinforced; fails low by default; no 10 kV surge rating. | Suitable for automotive BMS but lacks VDE 0884-10 surge validation and high-default fail-safe behavior. | Choose only if low-default logic aligns with system fault strategy and surge immunity is not mandated. |
Compared with ADUM2402ARWZ and ISO6741QDWR, SI8640ET-ISR delivers 6× higher data rate, full VDE 0884-10 reinforcement with 10 kV surge margin, and deterministic high-default fail-safe behavior - making it uniquely suited for EV traction inverters and medical-grade isolated power supplies requiring functional safety compliance.
Availability
SI8640ET-ISR is available at Aetrix Electronics and suitable for battery management systems, motor control inverters, on-board chargers, and industrial PLC I/O modules requiring stable component supply across automotive and industrial lifecycles.
Supply support for SI8640ET-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 Si864x family was designed specifically for high-reliability, high-speed galvanic isolation in automotive electrification and industrial automation - delivering reinforced safety certification, ultra-low power, and precision timing in compact packages.
FAQ
What is the isolation rating and safety certification of SI8640ET-ISR?
The SI8640ET-ISR is rated for 5.0 kVRMS reinforced isolation and certified to UL 1577, CSA Component Notice 5A, IEC 60950-1/62368-1/60601-1, VDE 0884-10 (reinforced), and CQC GB4943.1. Its VDE 0884-10 certification includes 10 kV surge capability - verified per test condition in the official Skyworks datasheet. SI8640ET-ISR meets requirements for medical and industrial safety-critical designs.
Does SI8640ET-ISR support fail-safe high-default operation?
Yes, SI8640ET-ISR is an "ET"-suffix part, meaning it is factory-configured with high-default fail-safe mode: when VDD1 is unpowered, outputs B1–B4 default to logic high (via internal 10 µA pull-ups) while VDD2 remains active. This behavior is guaranteed per Table 3.1 and Section 3.4 of the Si864x datasheet. SI8640ET-ISR ensures safe system state transitions during input-side power loss.
What package type and creepage distance does SI8640ET-ISR use?
SI8640ET-ISR uses the 16-pin wide-body SOIC (-IS) package with 10.3 mm body width and 8 mm creepage distance - validated in Table 4.6 and Package Outline Figure 6 of the datasheet. This package supports reinforced insulation up to 5.0 kVRMS and complies with IPC-7351B standards for surface-mount assembly. SI8640ET-ISR's land pattern matches JEDEC MS-013AC.
How many input and output channels does SI8640ET-ISR have?
SI8640ET-ISR has four input channels (INA1–INA4) on the VDD1 side and zero inputs on the VDD2 side - confirmed in Table 1.1 of the datasheet under "Number of Inputs VDD1 Side" (4) and "Number of Inputs VDD2 Side" (0). All outputs (OUTB1–OUTB4) reside on the VDD2 side and are controlled by a single EN pin. SI8640ET-ISR is optimized for unidirectional signal transmission from controller to power stage.
What is the maximum data rate and propagation delay of SI8640ET-ISR?
SI8640ET-ISR supports up to 150 Mbps data rate with a typical propagation delay of 8.0 ns and a maximum of 13 ns (per Table 4.2). Pulse width distortion is limited to 4.5 ns max, and channel-channel skew is 2.5 ns max - enabling precise timing in high-frequency motor control loops. These values are measured under VDD = 5 V, TA = 25 °C, CL = 15 pF, and are guaranteed across –40 to 125 °C. SI8640ET-ISR maintains this performance without initialization overhead.
SI8640ET-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- 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:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 60kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13ns, 13ns
- Pulse Width Distortion (Max):
- 4.5ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 2.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8640ET-ISR FAQ
1.How can I place an order for SI8640ET-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8640ET-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 SI8640ET-ISR reliable?
The price and inventory of SI8640ET-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8640ET-ISR is usually 5 days.
3.What payment methods are accepted for SI8640ET-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8640ET-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8640ET-ISR?
SI8640ET-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8640ET-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 SI8640ET-ISR?
For technical support, including SI8640ET-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8640ET-ISR requirements.
6.How does Aetrix verify that SI8640ET-ISR is sourced from the original manufacturer or authorized distributors?
All SI8640ET-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 SI8640ET-ISR meets industry standards.
7.What is the process for return or replacement of SI8640ET-ISR?
All SI8640ET-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8640ET-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 SI8640ET-ISR part is unused and in its original packaging.
Return procedure for SI8640ET-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8640ET-ISR Tags
-
ISO1212DBQR
Texas Instruments
-
ISO6721BDR
Texas Instruments
-
SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
-
ISO7721DR
Texas Instruments
-
ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
-
ISO7721DWVR
Texas Instruments
-
ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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