My Inquiry
My Account
Skyworks Solutions Inc. SI8645BT-IS
- Part No.:
- SI8645BT-IS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8645BT-IS.pdf
- Description:
- DGTL ISO 5000VRMS 4CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,951
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8645BT-IS 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 per VDE 0884-10, supporting up to 150 Mbps data rate, <10 ns propagation delay, and operating across –40 to 125 °C. It enables robust signal isolation in high-noise industrial power inverters and isolated ADC interfaces.
For engineers reviewing the SI8645BT-IS datasheet, SI8645BT-IS pinout, SI8645BT-IS application, or SI8645BT-IS equivalent, this page delivers verified electrical specs, fail-safe mode behavior, SOIC-16 wide-body package details, and automotive-grade alternatives compliant with AEC-Q100 and reinforced insulation standards.
Technical Context
The SI8645BT-IS implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior CMTI (≥60 kV/µs) versus optocouplers. 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), output-only on Side B (VDD2); no enable pins are present (per Table 3.2), and default output state is low during power loss-a factory-configured fail-safe mode confirmed for SI8645BT-IS in the Ordering Guide.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels / Direction | 4-channel, unidirectional (A→B only); no EN pins - fixed output enable for all channels. |
| Isolation Rating | 5.0 kVRMS reinforced (VDE 0884-10 certified); supports 8 mm creepage in WB SOIC-16 package. |
| Max Data Rate | 150 Mbps - enables high-speed serial interface isolation (e.g., SPI clock/data lines at ≥50 MHz). |
| Propagation Delay | 8.0 ns (typ), ≤13 ns (max) - ensures tight timing control in real-time motor control feedback loops. |
| Supply Voltage | 2.375–5.5 V on both sides - interoperable with 3.3 V and 5 V logic domains without level shifters. |
| CMTI | ≥60 kV/µs (min) - sustains reliable operation in high-dV/dt environments like IGBT gate drivers. |
| Fail-Safe Default | Low-state output when VDD1 is unpowered - prevents undefined logic states in isolated power supply monitoring. |
Pinout & Package
SI8645BT-IS uses a RoHS-compliant 16-pin wide-body SOIC package (WB SOIC-16, -IS suffix), with 8.0 mm creepage distance and reinforced insulation rating. Pin assignments follow standard Si864x layout for quad unidirectional isolators.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for channel inputs (A1–A4); must be ≥2.375 V for valid operation. |
| GND1 | Input-side ground | Reference for A-side logic; requires local 0.1 µF bypass capacitor. |
| A1–A4 | Input signals | CMOS/Schmitt-trigger inputs; tolerate 0–5.5 V swing; no external pull-ups needed. |
| VDD2 | Output-side supply | Power for output drivers (B1–B4); independent of VDD1 for galvanic isolation. |
| GND2 | Output-side ground | Reference for B-side logic; isolated from GND1; requires separate 0.1 µF bypass. |
| B1–B4 | Isolated outputs | 50 Ω (typ) output impedance; drive 15 pF loads at 150 Mbps with <4 ns rise/fall times. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced VDE 0884-10 certification | Validated 5.0 kVRMS working voltage and 10 kV surge capability - meets IEC 62368-1 and 60601-1 system requirements. |
| Ultra-low power at 100 Mbps | 5.5 mA per channel at 5 V (typ) - reduces thermal load in densely packed industrial PLC modules. |
| Sub-10 ns propagation delay | 8.0 ns (typ), 13 ns (max) - preserves signal integrity in time-critical isolated feedback paths (e.g., current sensing). |
| Schmitt-trigger inputs | Hysteresis = 0.44 V (typ) - rejects >100 mV noise spikes on long PCB traces in factory automation systems. |
| Fail-safe low default | Guaranteed logic-low output during VDD1 brownout - prevents false triggering in isolated enable/control lines. |
Applications
| Industrial Motor Control | Isolated Power Supply Monitoring |
|---|---|
|
Use Scenario: Isolating PWM gate-drive signals and current-sense feedback in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Quad unidirectional isolator conveying A1–A4 (PWM/FAULT/EN/CLK) to B1–B4 on isolated high-side domain. Use Value: 150 Mbps capability supports 100 kHz switching frequencies with margin; 60 kV/µs CMTI prevents false turn-on during IGBT commutation. |
Use Scenario: Monitoring isolated DC bus voltage and temperature in switched-mode power supplies. IC Role / Device Role / Timing Role: Transmitting analog-to-digital converter (ADC) serial output bits across isolation barrier to MCU host. Use Value: Sub-10 ns delay ensures accurate timestamping of overvoltage events; fail-safe low default disables downstream converters during input power loss. |
| Medical Isolated Data Acquisition | EV Battery Management Interface |
|
Use Scenario: Isolating patient-connected sensor front-end ADC outputs from main processing unit in diagnostic equipment. IC Role / Device Role / Timing Role: Carrying 4-channel SPI data (SDO, SCLK, CS, DRDY) from isolated ADC to host microcontroller. Use Value: Reinforced 5.0 kVRMS rating satisfies IEC 60601-1 creepage/clearance requirements; low EMI enables clean signal acquisition. |
Use Scenario: Isolating cell voltage measurement and balancing command signals between BMS controller and battery module. IC Role / Device Role / Timing Role: Relaying 4-bit status/control words (cell fault, balance enable, temp alert, ready) across 500 V isolation barrier. Use Value: AEC-Q100 qualified variant (SI8645BT-AS) available; 125 °C operation supports under-hood BMS placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8645BD-B-IS | Same 4-channel unidirectional function, 5.0 kVRMS rating, but basic (not reinforced) VDE 0884-10 certification; no 10 kV surge rating. | Approved for IEC 60950-1 systems only; not suitable for medical (60601-1) or reinforced insulation end-equipment. | Select SI8645BD-B-IS only if system-level safety certification does not require VDE 0884-10 reinforcement. |
| ADUM2400ARWZ | 4-channel unidirectional isolator, 5.0 kVRMS (UL/CSA), but 25 Mbps max data rate and 35 ns propagation delay; no VDE 0884-10 reinforcement. | Limited to lower-speed interfaces (e.g., I²C, slow SPI); insufficient for 100+ Mbps isolated ADC links. | Choose ADUM2400ARWZ only when bandwidth demand is ≤25 Mbps and VDE reinforcement is not required. |
Compared with SI8645BT-IS, SI8645BD-B-IS offers identical pinout and speed but lacks VDE 0884-10 reinforcement, while ADUM2400ARWZ provides legacy compatibility at significantly lower bandwidth and no reinforced certification - making SI8645BT-IS the sole option meeting 150 Mbps + VDE-reinforced + medical/industrial safety requirements.
Availability
SI8645BT-IS is available at Aetrix Electronics and suitable for industrial motor control, isolated power supply monitoring, medical data acquisition, and EV battery management systems requiring stable component supply, long-term lifecycle support, and certified reinforced isolation.
Supply support for SI8645BT-IS 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 needs - delivering ultra-low power, sub-10 ns timing, and VDE-reinforced 5.0 kVRMS ratings in compact SOIC packages.
FAQ
What is the isolation rating and certification status of SI8645BT-IS?
SI8645BT-IS is rated for 5.0 kVRMS reinforced isolation and certified to VDE 0884-10 (including 10 kV surge capability), UL 1577, CSA 5A, and IEC 62368-1. This makes SI8645BT-IS suitable for medical (IEC 60601-1) and industrial safety-critical applications where reinforced insulation is mandated.
Does SI8645BT-IS support fail-safe operation, and what is its default output state?
Yes, SI8645BT-IS features a factory-configured fail-safe mode with default low output state when VDD1 is unpowered. This behavior is confirmed in the Ordering Guide and ensures predictable deactivation of downstream circuitry during input-side power loss - a critical requirement in isolated power enable paths.
What are the supply voltage requirements for SI8645BT-IS?
SI8645BT-IS operates with VDD1 and VDD2 independently configurable from 2.375 V to 5.5 V. Both supplies must meet this range for guaranteed functionality; typical performance is specified at 3.3 V and 5.0 V, with UVLO thresholds centered at 2.24 V (rising) and 2.16 V (falling).
How many enable pins does SI8645BT-IS have, and how are they configured?
SI8645BT-IS has no enable pins - per Table 3.2 of the datasheet, "Si8645" entries show "- / -" for EN1/EN2. All four output channels (B1–B4) are permanently enabled, eliminating external control complexity and reducing BOM count in fixed-direction isolation designs.
What package type and creepage distance does SI8645BT-IS use?
SI8645BT-IS uses a 16-pin wide-body SOIC package (-IS suffix) with 8.0 mm creepage distance, enabling compliance with reinforced insulation requirements for 500–800 VDC working voltages in industrial and automotive systems.
SI8645BT-IS 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:
- 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
SI8645BT-IS FAQ
1.How can I place an order for SI8645BT-IS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BT-IS 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 SI8645BT-IS reliable?
The price and inventory of SI8645BT-IS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BT-IS is usually 5 days.
3.What payment methods are accepted for SI8645BT-IS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BT-IS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BT-IS?
SI8645BT-IS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BT-IS 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 SI8645BT-IS?
For technical support, including SI8645BT-IS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BT-IS requirements.
6.How does Aetrix verify that SI8645BT-IS is sourced from the original manufacturer or authorized distributors?
All SI8645BT-IS 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 SI8645BT-IS meets industry standards.
7.What is the process for return or replacement of SI8645BT-IS?
All SI8645BT-IS units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BT-IS, 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 SI8645BT-IS part is unused and in its original packaging.
Return procedure for SI8645BT-IS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BT-IS 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
