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Skyworks Solutions Inc. SI8645ET-IS2
- Part No.:
- SI8645ET-IS2
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645ET-IS2.pdf
- Description:
- LINEAR IC'S
- Quantity:
- Payment:
- Shipping:
Inventory:2,999
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Product details
Overview
SI8645ET-IS2 from Skyworks is a quad-channel, high-speed digital isolator with reinforced 5 kVRMS isolation, Schmitt-trigger inputs, and selectable high-default fail-safe output mode. It supports DC–150 Mbps data rates, achieves <10 ns propagation delay, and operates across –40 to 125 °C with 2.5–5.5 V supply on both sides. It is used in isolated ADC interfaces, motor control gate drivers, and battery management systems requiring robust noise immunity and safety certification.
For engineers reviewing the SI8645ET-IS2 datasheet, SI8645ET-IS2 pinout, SI8645ET-IS2 application, or SI8645ET-IS2 equivalent, key selection criteria include its 5 kVRMS reinforced insulation (VDE 0884-10), wide-body SOIC-16 package with 8 mm creepage, tri-state enable control, and AEC-Q100 qualification for automotive BMS and traction inverter designs.
Technical Context
The SI8645ET-IS2 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and providing superior CMTI (>60 kV/µs) versus optocouplers. All four channels are unidirectional from side A (inputs) to side B (outputs), with no enable pins (EN1/EN2 not present per Si8645 ordering definition).
It features a fail-safe default-high output state during input-side power loss, enabled by internal 10 µA pull-ups on all B-side outputs. Its wide 2.5–5.5 V dual-supply operation, ±40 °C to +125 °C ambient range, and stable timing (<2.5 ns channel skew) support industrial and automotive applications demanding long-term reliability under thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5 kVRMS reinforced insulation, certified to VDE 0884-10 and UL 1577 - enables use in medical and EV traction inverters requiring reinforced barrier integrity. |
| Max Data Rate | 150 Mbps - supports high-speed SPI, RS-485, and isolated CAN FD interfaces without signal degradation. |
| Propagation Delay | 5–13 ns (typ. 8 ns) - ensures tight timing alignment in real-time motor control PWM feedback loops. |
| Channel-Channel Skew | 0.4–2.5 ns (typ. 0.5 ns) - maintains phase coherence across parallel isolated signals in multi-phase inverter gate drive. |
| Supply Voltage Range | 2.5–5.5 V on both VDD1 and VDD2 - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| CMTI | 60 kV/µs (min.) - rejects fast common-mode transients in noisy power electronics environments like IGBT switching nodes. |
| Fail-Safe Default | High-output state when VDD1 is unpowered - prevents unintended low-side FET turn-on in isolated half-bridge drivers during brownout. |
Pinout & Package
SI8645ET-IS2 uses a 16-pin wide-body SOIC package (IS2 variant) with 8 mm creepage distance achieved via tie-bar elimination while retaining standard WB SOIC-16 land pattern compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies logic and RF transmitter circuitry; bypassed with 0.1 µF capacitor near pin. |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by isolation barrier. |
| INA1–INA4 | Unidirectional input channels | Accept 2.0–5.5 V logic; Schmitt-trigger inputs provide >400 mV hysteresis for noise rejection. |
| VDD2 | Output-side power supply | Supplies RF receiver and output drivers; independent of VDD1 for galvanic isolation. |
| GND2 | Output-side ground reference | Return path for VDD2; forms isolated domain with VDD2 and B-side outputs. |
| OUTB1–OUTB4 | Unidirectional output channels | Drive 50 Ω loads; default-high state during VDD1 loss; 4 mA sink/source capability at 5 V. |
| NC | No-connect terminal | Not internally connected; may be left floating, tied to VDD2, or grounded per layout needs. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Enables single-package reinforced insulation for IEC 62368-1 and IEC 60601-1 end-equipment compliance without external barriers. |
| RF-based isolation architecture | Eliminates startup delay and aging drift; provides stable timing over temperature and lifetime vs. LED-based optocouplers. |
| Tri-state disabled outputs | Outputs enter high-impedance state only if EN pins were present - but SI8645 has no EN pins, so outputs remain active or default-high. |
| 10 µA internal pull-ups on OUTBx | Guarantees defined high state during VDD1 undervoltage or loss - critical for safe shutdown in BMS and OBC systems. |
| 8 mm creepage (IS2 package) | Meets reinforced insulation requirements for 1000 VAC working voltage in high-voltage battery systems per IEC 61851-23. |
Applications
| Motor Control Systems | Isolated ADC Interfaces |
|---|---|
Use Scenario: Isolating PWM gate-drive signals between MCU and IGBT/SiC half-bridge drivers in servo drives and EV inverters. IC Role / Device Role / Timing Role: Quad-channel unidirectional isolator transmitting four independent control signals with sub-10 ns delay and <1 ns skew. Use Value: Prevents ground-loop-induced shoot-through and ensures synchronized switching across phases under high dv/dt conditions. | Use Scenario: Isolating serial interface lines (SDO, SCLK, CS) between isolated precision ADCs (e.g., ADS131M04) and host microcontrollers. IC Role / Device Role / Timing Role: High-speed, low-jitter digital isolator preserving SPI timing integrity up to 150 Mbps for 24-bit simultaneous sampling. Use Value: Maintains signal fidelity and eliminates measurement offset caused by common-mode noise coupling into analog front-end domains. |
| Battery Management Systems | On-Board Chargers |
Use Scenario: Isolating cell voltage monitoring and balancing command signals between isolated slave controllers and master BMS MCU. IC Role / Device Role / Timing Role: Fail-safe default-high isolator ensuring open-circuit signaling during communication loss or input power interruption. Use Value: Prevents false balancing activation and guarantees safe fault response when primary supply fails in high-voltage battery packs. | Use Scenario: Isolating digital control signals between AC/DC and DC/DC stages in bidirectional OBCs for BEVs. IC Role / Device Role / Timing Role: Reinforced 5 kVRMS isolator enabling safe communication across 800 V DC bus domains with 8 mm creepage. Use Value: Meets IEC 61851-23 reinforced insulation requirements for conductive charging systems without additional isolation components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM4402BRWZ | 4-channel, 5 kV RMS, 100 Mbps max, 15 ns max propagation delay, no fail-safe default option. | Lacks selectable default-high mode; requires external pull-ups for safe state control. | Choose when lower cost and legacy ADI ecosystem integration outweigh need for sub-10 ns timing and guaranteed fail-safe behavior. |
| ISO6741QDWRQ1 | 4-channel, 5 kV RMS, 50 Mbps max, 25 ns max propagation delay, AEC-Q100 qualified, default-low only. | Lower speed and fixed default-low limit use in high-frequency motor control and BMS where default-high is mandatory. | Choose only for cost-sensitive automotive body electronics where 50 Mbps and default-low are acceptable. |
Compared with ADUM4402BRWZ and ISO6741QDWRQ1, SI8645ET-IS2 delivers higher speed (150 Mbps), tighter timing (8 ns typ. delay), and factory-configured default-high fail-safe behavior-making it uniquely suited for next-generation EV powertrain and high-accuracy isolated sensing.
Availability
SI8645ET-IS2 is available at Aetrix Electronics and suitable for battery management systems, motor control inverters, and on-board chargers requiring stable component supply with automotive-grade traceability and long-lifecycle support.
Supply support for SI8645ET-IS2 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 industrial and automotive isolation applications-delivering ultra-low power, precise timing, and reinforced safety certification in compact packages.
FAQ
What is the isolation rating and safety certification status of SI8645ET-IS2?
SI8645ET-IS2 provides 5 kVRMS reinforced isolation and is certified to VDE 0884-10, UL 1577, CSA Component Notice 5A, and CQC GB4943.1. It meets IEC 62368-1 and IEC 60601-1 reinforced insulation requirements. These certifications are validated for the IS2 package variant and apply directly to SI8645ET-IS2 without derating.
Does SI8645ET-IS2 have enable pins, and how are outputs controlled?
No, SI8645ET-IS2 does not include enable pins (EN1/EN2). As specified in the Si8645 ordering definition, all four channels are permanently enabled from INA1–INA4 to OUTB1–OUTB4. Outputs follow inputs when powered and default to high during VDD1 loss due to internal 10 µA pull-ups-no external control or tri-state capability is provided.
What is the meaning of the "-IS2" suffix in SI8645ET-IS2?
The "-IS2" suffix denotes the wide-body SOIC-16 package variant with tie-bar elimination, achieving 8 mm creepage distance while maintaining standard WB SOIC-16 footprint and land pattern. This design satisfies reinforced insulation requirements for 1000 VAC working voltage in high-voltage systems such as EV battery packs and OBCs.
How does the fail-safe default-high behavior of SI8645ET-IS2 function during power loss?
When VDD1 drops below UVLO threshold (≈2.2 V), SI8645ET-IS2's outputs transition to a defined high state within 12 ns (tSD), maintained by internal 10 µA pull-ups on OUTB1–OUTB4. This behavior is factory-set and irreversible-ensuring safe deactivation of downstream drivers in BMS and inverter applications during brownout or isolation barrier faults.
Is SI8645ET-IS2 qualified for automotive applications, and what documentation is available?
Yes, SI8645ET-IS2 is AEC-Q100 qualified and supported with AIAG-compliant PPAP documentation, IMDS/CAMDS material declarations, and full automotive process flow validation. Its automotive-grade counterpart is SI8645ET-AS2; both share identical electrical specs and packaging-only differing in manufacturing traceability and certification reporting.
SI8645ET-IS2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- 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:
- 2.375V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8645ET-IS2 FAQ
1.How can I place an order for SI8645ET-IS2 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645ET-IS2 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 SI8645ET-IS2 reliable?
The price and inventory of SI8645ET-IS2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645ET-IS2 is usually 5 days.
3.What payment methods are accepted for SI8645ET-IS2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645ET-IS2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645ET-IS2?
SI8645ET-IS2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645ET-IS2 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 SI8645ET-IS2?
For technical support, including SI8645ET-IS2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645ET-IS2 requirements.
6.How does Aetrix verify that SI8645ET-IS2 is sourced from the original manufacturer or authorized distributors?
All SI8645ET-IS2 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 SI8645ET-IS2 meets industry standards.
7.What is the process for return or replacement of SI8645ET-IS2?
All SI8645ET-IS2 units undergo pre-shipment inspection (PSI). If there is an issue with SI8645ET-IS2, 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 SI8645ET-IS2 part is unused and in its original packaging.
Return procedure for SI8645ET-IS2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645ET-IS2 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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