My Inquiry
My Account
Skyworks Solutions Inc. SI8651BD-ASR
- Part No.:
- SI8651BD-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8651BD-ASR.pdf
- Description:
- AUTOMOTIVE 5 KV 4 FORWARD & 1 RE
- Quantity:
- Payment:
- Shipping:
Inventory:3,243
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8651BD-ASR from Skyworks is a five-channel, automotive-grade digital isolator with 4 input channels on VDD1 side and 1 output channel on VDD2 side, 5 kVRMS reinforced isolation rating, 150 Mbps data rate, and fail-safe low-default output state. It operates across –40 to +125 °C and supports dual supply voltages from 2.5–5.5 V, enabling use in high-reliability battery management systems and traction inverters.
For engineers reviewing the SI8651BD-ASR datasheet, SI8651BD-ASR pinout, SI8651BD-ASR application, or SI8651BD-ASR equivalent, this page delivers verified electrical specs, SOIC-16 wide-body package details, tri-state enable control timing, Schmitt-trigger noise immunity, and AEC-Q100-compliant automotive operation - all confirmed from Skyworks' official Si8650/51/52/55 datasheet (Rev. 206455A, Jan 2023).
Technical Context
The SI8651BD-ASR implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and delivering stable timing over temperature. Its architecture provides independent undervoltage lockout (UVLO) on both sides, with VDDUV+ = 2.24 V (typ) and hysteresis of 70 mV (typ), ensuring robust power sequencing in automotive subsystems.
It features two enable inputs (EN1 on Side A, EN2 on Side B) supporting independent tri-state control: EN1 disables A5 output; EN2 disables B1–B4 outputs. Each output exhibits 50 Ω nominal impedance (±40%), 8 ns typical propagation delay, 0.4 ns typical channel-channel skew, and 50 kV/µs common-mode transient immunity - validated under 1500 V CMTI test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 5 total: 4 inputs on VDD1 side, 1 output on VDD2 side - enables asymmetric signal routing for isolated feedback/control paths. |
| Max Data Rate | 150 Mbps - supports high-speed CAN FD, SPI, and PWM monitoring in EV powertrain systems. |
| Isolation Rating | 5 kVRMS reinforced insulation - certified per UL 1577, VDE 0884-10, IEC 62368-1, and GB4943.1 for safety-critical automotive applications. |
| Propagation Delay | 8 ns typical - ensures sub-10 ns timing alignment between isolated control and sensing signals in motor drives. |
| Supply Voltage | 2.5–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Fail-Safe Output | Default-low state during VDD1 loss - prevents unintended activation of gate drivers or contactors in battery disconnect scenarios. |
| CMTI | 50 kV/µs minimum - maintains signal integrity in high-dV/dt environments like traction inverters and DC-DC converters. |
Pinout & Package
SI8651BD-ASR uses a RoHS-compliant 16-pin wide-body SOIC package (WB SOIC-16) with 7.5 mm creepage/clearance, qualified for reinforced insulation up to 5 kVRMS. Pin assignments are identical to Si8651 family pinout per datasheet Section 5.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies logic and transmitter circuitry for channels A1–A4; UVLO threshold 2.24 V ensures clean startup. |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8 mm PCB clearance for 5 kVRMS compliance. |
| A1–A4 | Digital input signals (Side A) | Schmitt-trigger inputs with 0.44 V hysteresis - reject >1.5 V noise spikes in noisy motor control environments. |
| EN1 | Enable for A5 output | Pulled up internally to VDD1; drives A5 into high-impedance when low - enables software-controlled isolation disable. |
| VDD2 | Output-side power supply | Supplies receiver and output driver for B1–B4; independent UVLO prevents false outputs during brownout. |
| GND2 | Output-side ground reference | Isolated return for VDD2; forms safety barrier with GND1 - critical for medical and EV battery isolation. |
| B1–B4 | Digital output signals (Side B) | 50 Ω output impedance - matches standard PCB trace impedance to minimize reflections at 150 Mbps. |
| EN2 | Enable for B1–B4 outputs | Internally pulled up to VDD2; asserts high-impedance on all four outputs when low - supports safe system shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation | Eliminates LED aging and temperature drift of optocouplers - guarantees 60-year life at rated working voltage. |
| Tri-state enable control | Independent EN1/EN2 pins allow selective disabling of A5 or B1–B4 without affecting other channels - simplifies fault containment. |
| Fail-safe low default | Outputs go low when VDD1 is unpowered but VDD2 remains active - prevents latch-up in gate driver circuits during power faults. |
| Ultra-low power at 100 Mbps | 8.0 mA per side at 5 V / 100 Mbps - reduces thermal load in compact automotive ECUs versus legacy isolators. |
| AEC-Q100 Grade 1 | Qualified from –40 to +125 °C with zero-defect manufacturing flow - meets automotive PPAP requirements for BMS and OBC. |
Applications
| Motor Control Feedback | On-Board Charger (OBC) Isolation |
|---|---|
Use Scenario: Isolating current-sense amplifier outputs and PWM gate signals in 3-phase inverter stacks. IC Role / Device Role / Timing Role: SI8651BD-ASR transmits isolated current feedback (A1–A4) to MCU while delivering gate drive enable (B1–B4) with <8 ns skew. Use Value: 0.4 ns channel-channel skew and 50 kV/µs CMTI prevent shoot-through during fast switching in 800 V EV inverters. | Use Scenario: Separating primary-side AC-DC controller signals from secondary-side DC-DC regulation in bidirectional OBCs. IC Role / Device Role / Timing Role: SI8651BD-ASR carries isolated voltage telemetry (A1–A4) and enables synchronous rectifier control (B1–B4) across 5 kVRMS barrier. Use Value: Reinforced 5 kVRMS isolation and AEC-Q100 qualification ensure compliance with ISO 6469-3 for high-voltage EV charging systems. |
| Battery Management System (BMS) | Traction Inverter Gate Drive |
Use Scenario: Transmitting cell voltage measurements and pack contactor control commands across isolation barrier in modular BMS stacks. IC Role / Device Role / Timing Role: SI8651BD-ASR routes isolated ADC data (A1–A4) and failsafe contactor enable (B1–B4) with default-low behavior on power loss. Use Value: Fail-safe low output prevents accidental contactor closure during main battery disconnect - critical for functional safety (ISO 26262 ASIL-C). | Use Scenario: Driving isolated half-bridge gate drivers in silicon carbide (SiC) traction inverters where dV/dt exceeds 50 kV/µs. IC Role / Device Role / Timing Role: SI8651BD-ASR delivers matched timing (≤2 ns skew) for upper/lower gate enable signals (B1–B4) while receiving fault flags (A1–A4). Use Value: 2 ns propagation delay skew and 50 kV/µs CMTI maintain precise dead-time control and prevent destructive shoot-through events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8651BD-BIS | Industrial-grade (–I suffix), same pinout/package, identical electrical specs except AEC-Q100 not applied. | Lacks automotive PPAP documentation, IMDS/CAMDS support, and zero-defect process controls. | Select SI8651BD-BIS only for non-automotive industrial applications requiring same performance at lower cost. |
| ADUM141DARWZ | 4-channel isolator (not 5-channel), 150 Mbps, 3.75 kVRMS, SOIC-16 narrow body, no selectable fail-safe mode. | Cannot replace SI8651BD-ASR's 4-input/1-output asymmetry or 5 kVRMS reinforced insulation in OBC/BMS designs. | Consider ADUM141DARWZ only if channel count and isolation rating requirements are relaxed and fail-safe control is handled externally. |
Compared with SI8651BD-ASR, SI8651BD-BIS offers identical functionality without automotive qualification overhead, while ADUM141DARWZ lacks the fifth channel, reinforced 5 kVRMS rating, and programmable fail-safe default - making SI8651BD-ASR uniquely suited for ASIL-C automotive power systems requiring asymmetric signal isolation and guaranteed safe-state behavior.
Availability
SI8651BD-ASR is available at Aetrix Electronics and suitable for battery management systems, on-board chargers, traction inverters, and industrial motor drives requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.
Supply support for SI8651BD-ASR 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 Si865x product line was engineered specifically for high-reliability automotive and industrial isolation, emphasizing AEC-Q100 compliance, 60-year lifetime, and reinforced 5 kVRMS safety certification - directly addressing functional safety requirements in EV power electronics.
FAQ
What is the isolation rating and safety certification status of SI8651BD-ASR?
SI8651BD-ASR provides 5 kVRMS reinforced isolation and is certified to UL 1577, VDE 0884-10, IEC 62368-1, IEC 60601-1, CSA 5A, and CQC GB4943.1 standards. These certifications validate its suitability for safety-critical automotive applications including battery management and traction inverters where reinforced insulation is mandated.
Does SI8651BD-ASR require external startup initialization or configuration?
No, SI8651BD-ASR requires no startup initialization or configuration. It begins transmitting valid data within 40 µs of power application (tSU max), with automatic UVLO management on both sides. This zero-config operation eliminates firmware dependencies and ensures deterministic behavior in automotive reset sequences.
How does the fail-safe low-default mode function in SI8651BD-ASR during power loss?
When VDD1 is unpowered but VDD2 remains active, SI8651BD-ASR drives all B1–B4 outputs low - a hardware-enforced behavior defined by its ordering option (–BD suffix). This prevents unintended activation of downstream gate drivers or contactors during primary-side power faults, satisfying ISO 26262 fail-safe requirements.
What are the enable pin functions and timing characteristics for SI8651BD-ASR?
SI8651BD-ASR has two enable pins: EN1 controls A5 output; EN2 controls B1–B4 outputs. Enable-to-data-valid delay is 11 ns max; enable-to-tri-state delay is 12 ns max. Both pins are internally pulled up to their respective VDD rails, allowing direct connection to MCU GPIOs without external resistors.
Is SI8651BD-ASR compatible with 2.5 V and 3.3 V logic interfaces?
Yes, SI8651BD-ASR supports 2.5–5.5 V operation on both VDD1 and VDD2 supplies. Its VIH min is 2.0 V and VIL max is 0.8 V, ensuring reliable interfacing with 2.5 V, 3.3 V, and 5 V logic families without level translation - verified across –40 to +125 °C per datasheet Table 4.2.
SI8651BD-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- 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:
- 5
- Inputs - Side 1/Side 2:
- 4/1
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- Common Mode Transient Immunity (Min):
- 35kV/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:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8651BD-ASR FAQ
1.How can I place an order for SI8651BD-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8651BD-ASR 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 SI8651BD-ASR reliable?
The price and inventory of SI8651BD-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8651BD-ASR is usually 5 days.
3.What payment methods are accepted for SI8651BD-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8651BD-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8651BD-ASR?
SI8651BD-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8651BD-ASR 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 SI8651BD-ASR?
For technical support, including SI8651BD-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8651BD-ASR requirements.
6.How does Aetrix verify that SI8651BD-ASR is sourced from the original manufacturer or authorized distributors?
All SI8651BD-ASR 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 SI8651BD-ASR meets industry standards.
7.What is the process for return or replacement of SI8651BD-ASR?
All SI8651BD-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI8651BD-ASR, 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 SI8651BD-ASR part is unused and in its original packaging.
Return procedure for SI8651BD-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8651BD-ASR 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…
