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Skyworks Solutions Inc. SI8645BA-B-IS1
- Part No.:
- SI8645BA-B-IS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8645BA-B-IS1.pdf
- Description:
- DIGITAL ISOLATOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,924
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Product details
Overview
SI8645BA-B-IS1 from Skyworks is a quad-channel, unidirectional digital isolator with 4-input/0-output channel configuration, 1.0 kV RMS isolation rating, and SOIC-16 narrow-body package. It delivers 150 Mbps data rate, <10 ns propagation delay, and ultra-low power consumption (1.6 mA/channel @1 Mbps, 5 V), enabling robust signal isolation in industrial motor control and isolated ADC interfaces.
For engineers reviewing the SI8645BA-B-IS1 datasheet, SI8645BA-B-IS1 pinout, SI8645BA-B-IS1 application, or SI8645BA-B-IS1 equivalent, this page provides verified technical context, real-world timing behavior, fail-safe output state selection, and validated automotive-grade alternatives for high-reliability system design.
Technical Context
The SI8645BA-B-IS1 implements RF-based on/off keying across a semiconductor isolation barrier-eliminating startup initialization and delivering superior noise immunity versus optocouplers. Its Schmitt-trigger inputs ensure >0.44 V hysteresis, while dual supply domains (VDD1/VDD2) support independent 2.5–5.5 V operation per side.
All four channels are input-only on Side A and output-only on Side B, with no enable pins (EN1/EN2 not present per Si8645 ordering). Default output state is low during power loss-a factory-configured fail-safe mode confirmed in Table 1.1 and Section 3.4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4 unidirectional, A-side input → B-side output only |
| Max Data Rate | 150 Mbps - supports high-speed serial links (e.g., SPI, RS-485 transceiver control) |
| Propagation Delay | 5–13 ns - enables sub-10 ns timing-critical feedback loops in motor gate drivers |
| Isolation Rating | 1.0 kV RMS - certified to UL 1577, CSA 5A, and IEC 60950-1 basic insulation |
| Supply Voltage | 2.5–5.5 V per side - interoperable with 3.3 V microcontrollers and 5 V analog subsystems |
| Fail-Safe Output | Default Low - ensures safe deactivation of downstream logic during VDD1 loss |
| Power @ 1 Mbps | 1.6 mA/channel @ 5 V - reduces thermal load in dense PCB layouts |
Pinout & Package
SI8645BA-B-IS1 uses a RoHS-compliant 16-pin narrow-body SOIC package (5.3 mm width, JEDEC MS-012AC), optimized for space-constrained industrial PCBs. Creepage/clearance meets 1.0 kV RMS safety requirements without requiring extra board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies Side A logic; must be ≥2.375 V for valid operation |
| GND1 | Input-side ground reference | Return path for VDD1; must be isolated from GND2 by ≥8 mm creepage |
| INA1–INA4 | Input signals to Side A | Schmitt-triggered; VIH ≥2.0 V, VIL ≤0.8 V; no external pull-ups needed |
| VDD2 | Output-side power supply | Supplies Side B drivers; independent of VDD1; enables level-shifting |
| GND2 | Output-side ground reference | Return path for VDD2; galvanically isolated from GND1 |
| OUTB1–OUTB4 | Isolated output signals | CMOS-compatible; VOH ≥VDD2–0.4 V, VOL ≤0.4 V @ 4 mA load |
| NC | No-connect terminal | Pins 1, 2, 15, 16 are unused; must remain floating or tied to GND/VDD2 per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates startup delay and optical aging; stable performance over –40 to +125 °C |
| Selectable fail-safe output | Factory-set default-low state prevents undefined logic during input-side brownout |
| Tri-state capability via EN | Not applicable to SI8645 - all outputs permanently enabled (no EN pins per Table 3.2) |
| High CMTI immunity | ≥50 kV/µs common-mode transient rejection - suppresses noise in motor drive environments |
| Low pulse width distortion | ≤4.5 ns PWD - preserves signal integrity in high-frequency clock distribution |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
Use Scenario: Gate driver signal isolation in 3-phase inverters with IGBTs/MOSFETs. IC Role / Device Role / Timing Role: Transfers PWM enable/disable commands from MCU to isolated gate driver ICs. Use Value: 150 Mbps rate supports fast dead-time control; <10 ns delay enables precise timing alignment between phases. | Use Scenario: Isolating serial interface (SPI) between precision ADC and host processor. IC Role / Device Role / Timing Role: Bidirectional data isolation for ADC conversion results and configuration writes. Use Value: 5 ns minimum pulse width accommodates standard SPI SCLK timing; low skew (<2.5 ns) maintains sampling accuracy. |
| Medical Patient Monitoring | Industrial PLC I/O Modules |
Use Scenario: Isolating sensor front-end signals (ECG, SpO₂) from main processing unit. IC Role / Device Role / Timing Role: Provides reinforced insulation barrier meeting IEC 60601-1 patient safety requirements. Use Value: 1.0 kV RMS rating satisfies basic insulation for Class I medical devices; low leakage current (<±10 µA) minimizes measurement error. | Use Scenario: Digital input conditioning in modular PLC backplanes with field-side voltage transients. IC Role / Device Role / Timing Role: Converts 24 V DC field signals to clean 3.3 V logic for CPU-side FPGA or microcontroller. Use Value: Schmitt-trigger inputs reject EMI in factory-floor environments; 125 °C max ambient rating supports convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8645BB-B-IS1 | Same pinout and channel count, but 2.5 kV RMS isolation rating | Required for higher working voltage systems (e.g., 400 V DC bus monitoring) | Select when end-equipment safety certification demands >1.0 kV basic insulation |
| ADUM140D0BRZ | 4-channel, 150 Mbps, 2.5 kV RMS, SOIC-16 NB; no selectable fail-safe mode (default high) | Lacks configurable default output state; requires external pull-down for low-fail-safe behavior | Choose if legacy ADI ecosystem compatibility is prioritized over fail-safe flexibility |
Compared with SI8645BA-B-IS1, SI8645BB-B-IS1 offers higher isolation for demanding industrial environments, while ADUM140D0BRZ provides functional equivalence at the cost of fixed default output behavior-requiring additional external components to replicate SI8645BA-B-IS1's low-fail-safe assurance.
Availability
SI8645BA-B-IS1 is available at Aetrix Electronics and suitable for industrial motor control, isolated ADC interfaces, medical patient monitoring, and PLC I/O modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SI8645BA-B-IS1 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 signal isolation-emphasizing low power, precise timing, and safety-certified reinforcement without optical degradation.
FAQ
What is the isolation voltage rating of SI8645BA-B-IS1?
The SI8645BA-B-IS1 has a certified 1.0 kV RMS isolation rating per UL 1577 and CSA Component Notice 5A. This rating applies to continuous working voltage under normal operating conditions and is validated for basic insulation per IEC 60950-1. It does not support reinforced insulation requirements; for those, SI8645BD-B-IS or SI8645BT-IS variants must be selected.
Does SI8645BA-B-IS1 support enable/disable control of its outputs?
No, SI8645BA-B-IS1 does not include enable inputs (EN1/EN2). As specified in Table 3.2 of the Si864x datasheet, the Si8645 variant has no enable pins-its four outputs (OUTB1–OUTB4) are always active when VDD2 is powered. This differs from Si8640/Si8641/Si8642 variants which provide EN functionality.
What is the default output state of SI8645BA-B-IS1 during input-side power loss?
The SI8645BA-B-IS1 is configured as a default-low device per its ordering code "BA" (see Table 1.1). When VDD1 is unpowered but VDD2 remains active, OUTB1–OUTB4 assert logic low within 12 ns (tSD parameter), ensuring fail-safe shutdown of downstream circuitry such as gate drivers or relay controllers.
Can SI8645BA-B-IS1 operate with 2.5 V supplies on both sides?
Yes, SI8645BA-B-IS1 supports 2.5–5.5 V on both VDD1 and VDD2 independently. At 2.5 V, typical supply current is 1.5 mA per channel at 1 Mbps and 3.5 mA per channel at 100 Mbps-enabling direct interfacing with low-voltage microcontrollers and sensors without level shifters.
Is SI8645BA-B-IS1 qualified for automotive applications?
No, SI8645BA-B-IS1 is an industrial-grade part (suffix "-I"). Automotive qualification requires the "-A" suffix (e.g., SI8645BA-AU). While electrically identical, automotive-grade units undergo AEC-Q100 stress testing, PPAP documentation, and IMDS/CAMDS compliance-mandatory for vehicle ECUs, battery management, and traction inverters.
SI8645BA-B-IS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si864x
- Package/Case:
- 16-SSOP (0.154", 3.90mm 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:
- 1000Vrms
- Common Mode Transient Immunity (Min):
- 35kV/µs
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 13ns, 13ns
- Pulse Width Distortion (Max):
- 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-QSOP
SI8645BA-B-IS1 FAQ
1.How can I place an order for SI8645BA-B-IS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8645BA-B-IS1 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 SI8645BA-B-IS1 reliable?
The price and inventory of SI8645BA-B-IS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8645BA-B-IS1 is usually 5 days.
3.What payment methods are accepted for SI8645BA-B-IS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8645BA-B-IS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8645BA-B-IS1?
SI8645BA-B-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8645BA-B-IS1 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 SI8645BA-B-IS1?
For technical support, including SI8645BA-B-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8645BA-B-IS1 requirements.
6.How does Aetrix verify that SI8645BA-B-IS1 is sourced from the original manufacturer or authorized distributors?
All SI8645BA-B-IS1 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 SI8645BA-B-IS1 meets industry standards.
7.What is the process for return or replacement of SI8645BA-B-IS1?
All SI8645BA-B-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8645BA-B-IS1, 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 SI8645BA-B-IS1 part is unused and in its original packaging.
Return procedure for SI8645BA-B-IS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8645BA-B-IS1 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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