My Inquiry
My Account
Skyworks Solutions Inc. SI8651BB-AS1
- Part No.:
- SI8651BB-AS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8651BB-AS1.pdf
- Description:
- AUTOMOTIVE 2.5 KV 4 FORWARD & 1
- Quantity:
- Payment:
- Shipping:
Inventory:4,842
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8651BB-AS1 from Skyworks is a five-channel automotive-grade digital isolator with 4 input channels on VDD1 side and 1 output channel on VDD2 side, 2.5 kVRMS isolation rating, 150 Mbps data rate, and fail-safe low-default output state. It operates across –40 to +125 °C and supports 2.5–5.5 V dual supplies for use in battery management systems and traction inverters.
For engineers reviewing the SI8651BB-AS1 datasheet, SI8651BB-AS1 pinout, SI8651BB-AS1 application, or SI8651BB-AS1 equivalent, key selection criteria include channel directionality (4:1), AEC-Q100 qualification, narrow-body SOIC-16 package, and precise timing specs including <10 ns propagation delay and <2.5 ns channel-channel skew.
Technical Context
The SI8651BB-AS1 implements RF-based on/off keying across a semiconductor isolation barrier, eliminating startup initialization and enabling robust noise immunity without optical components. Its architecture delivers sub-10 ns propagation delay and <0.5 ns typical channel-channel skew while maintaining stable timing over temperature and lifetime.
It features two independent enable inputs (EN1 on VDD1 side for A5; EN2 on VDD2 side for B1–B4), supporting tri-state control per side. Fail-safe behavior is factory-configured: during VDD1 loss with VDD2 powered, outputs default to logic low - confirmed by ordering code "BB" (low) and "AS1" (automotive, narrow SOIC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels & Direction | 5 total: 4 unidirectional inputs (A1–A4) on VDD1 side, 1 unidirectional input (A5) on VDD1 side, 4 outputs (B1–B4) on VDD2 side - enables asymmetric signal routing in BMS monitoring paths. |
| Max Data Rate | 150 Mbps - supports high-speed CAN FD, SPI, or isolated ADC interface clocking without oversampling penalties. |
| Propagation Delay | 5–13 ns (typ 8 ns) - ensures deterministic timing in real-time motor control loops with minimal latency impact. |
| Isolation Rating | 2.5 kVRMS - certified to UL 1577, VDE 0884-10, and CQC GB4943.1 for reinforced insulation in 400–800 V EV subsystems. |
| Supply Voltage | 2.5–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
| Power @ 100 Mbps | 8.0 mA (VDD1), 18.4 mA (VDD2) - ultra-low active power enables thermal-constrained placement near IGBT gate drivers. |
| CMTI | 50 kV/µs - rejects fast transients from switching nodes in traction inverters without data corruption. |
Pinout & Package
Narrow-body 16-pin SOIC (NB SOIC-16) package with creepage/clearance ≥ 8.0 mm, RoHS-compliant, peak reflow 260 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power for A1–A5 inputs and EN1; must be ≥2.5 V for valid operation; UVLO threshold 2.24 V (typ). |
| GND1 | Input-side ground | Reference for A1–A5, EN1, and VDD1; requires local 0.1 µF bypass capacitor. |
| A1–A4 | Digital inputs (VDD1 side) | 4-channel data inputs with Schmitt trigger thresholds (VT+ = 1.67 V, VT– = 1.23 V) for noise immunity. |
| A5 | 5th input (VDD1 side) | Control input for EN1 function; when EN1 = L, A5 output enters high-impedance state. |
| EN1 | Enable for A5 output | Active-high enable on VDD1 side; internally pulled up to VDD1 (2 µA); drives A5 into Hi-Z when low. |
| VDD2 | Output-side supply | Power for B1–B4 outputs and EN2; independent of VDD1; supports galvanic isolation. |
| GND2 | Output-side ground | Reference for B1–B4, EN2, and VDD2; isolated from GND1; requires separate 0.1 µF bypass. |
| B1–B4 | Digital outputs (VDD2 side) | 4-channel isolated outputs; default low during VDD1 loss; output impedance ≈50 Ω for controlled-impedance routing. |
| EN2 | Enable for B1–B4 outputs | Active-high enable on VDD2 side; when EN2 = L, B1–B4 enter high-impedance state; internal 2 µA pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; provides 60-year life at rated working voltage with no startup initialization. |
| Selectable fail-safe mode | Factory-set low-default output ensures safe shutdown of downstream gate drivers during primary-side power loss. |
| Tri-state enable per side | EN1 controls A5 output; EN2 controls B1–B4 outputs - enables dynamic bus sharing and low-power sleep modes. |
| High CMTI (50 kV/µs) | Rejects common-mode noise from fast-switching SiC/GaN power stages without added filtering or layout overhead. |
| AEC-Q100 Grade 0 qualified | Validated for operation from –40 to +125 °C ambient; manufactured with zero-defect automotive process flows and PPAP support. |
Applications
| Battery Management System (BMS) Cell Monitoring | Traction Inverter Gate Driver Interface |
|---|---|
Use Scenario: Isolating voltage/current sensor data from 96-cell EV battery packs to MCU across >500 V potential difference. IC Role / Device Role / Timing Role: SI8651BB-AS1 transmits 4 analog front-end ADC status bits and 1 fault flag across isolation barrier with <10 ns skew. Use Value: Enables synchronized sampling of cell voltages while meeting ASIL-C diagnostic coverage requirements via deterministic timing and fail-safe low default. |
Use Scenario: Transmitting PWM enable signals and fault feedback between MCU and isolated gate driver ICs in 800 V traction inverters. IC Role / Device Role / Timing Role: SI8651BB-AS1 carries 4 independent gate enable signals (B1–B4) and 1 DESAT fault indicator (A5) with 50 kV/µs CMTI immunity. Use Value: Prevents false turn-on during high dv/dt switching events; low propagation delay minimizes dead-time uncertainty in SiC half-bridges. |
| On-Board Charger (OBC) Control Loop | Automotive Isolated CAN FD Node |
Use Scenario: Isolating feedback signals (voltage, current, temperature) from secondary-side LLC resonant converter to primary-side controller. IC Role / Device Role / Timing Role: SI8651BB-AS1 routes 4 analog monitoring channels and 1 overtemperature alert across 2.5 kVRMS barrier with <2.5 ns inter-channel skew. Use Value: Maintains tight regulation bandwidth in closed-loop OBC designs; narrow SOIC-16 footprint saves PCB area in space-constrained modules. |
Use Scenario: Providing galvanic isolation between CAN FD controller and physical transceiver in high-voltage EV charging domain controllers. IC Role / Device Role / Timing Role: SI8651BB-AS1 isolates 4 CAN FD data lines (TXD/RXD dominant/recessive states) and 1 error flag line with 150 Mbps capability. Use Value: Supports 5 Mbps CAN FD data rates required for fast charging handshaking while meeting ISO 11898-2 EMC immunity targets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8651BB-IS1 | Industrial-grade (–I suffix), same pinout, identical electrical specs except AEC-Q100 not applied; no PPAP/IMDS support. | Approved for non-automotive industrial automation but not for ASIL-B/C safety-critical vehicle systems. | Select SI8651BB-IS1 only for cost-sensitive non-automotive designs where automotive qualification is unnecessary. |
| ISO7741FDWR | Texas Instruments part; 4-channel, 100 Mbps max, 3.75 kVRMS, SOIC-16 wide body; higher power (12 mA @ 100 Mbps), no AEC-Q100 Grade 0. | Suitable for lower-speed industrial isolation; wider SOIC package increases creepage but reduces board density. | Choose ISO7741FDWR only if higher isolation rating is mandatory and 150 Mbps speed is not required. |
Compared with SI8651BB-IS1, the SI8651BB-AS1 adds AEC-Q100 Grade 0 qualification, PPAP documentation, and IMDS compliance - essential for OEM automotive integration. Versus ISO7741FDWR, it delivers 50% higher data rate in a smaller narrow-body package but trades off 1.25 kVRMS isolation margin for automotive thermal robustness.
Availability
SI8651BB-AS1 is available at Aetrix Electronics and suitable for battery management systems, traction inverters, and on-board chargers requiring stable component supply under automotive qualification and long-term lifecycle assurance.
Supply support for SI8651BB-AS1 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 for high-reliability applications.
The SI8651BB-AS1 belongs to Skyworks' Si865x family of automotive-grade digital isolators, designed specifically for functional safety-critical EV subsystems including BMS, OBC, and traction inverters operating from –40 to +125 °C.
FAQ
What is the isolation rating and safety certification of SI8651BB-AS1?
The SI8651BB-AS1 provides 2.5 kVRMS isolation and is certified to UL 1577, VDE 0884-10, CSA Component Notice 5A, and CQC GB4943.1 standards. These approvals confirm reinforced insulation suitability for automotive 400–800 V systems. All certifications apply directly to the SI8651BB-AS1 part number per Skyworks' official documentation and test reports.
Does SI8651BB-AS1 support fail-safe operation, and how is it configured?
Yes, SI8651BB-AS1 has factory-configured fail-safe behavior: when VDD1 is unpowered and VDD2 remains active, all outputs default to logic low. This is fixed by the "BB" ordering code (low default) and cannot be changed in-circuit. The SI8651BB-AS1 datasheet confirms this behavior in Table 3.1 and Section 3.4.
What are the enable pin functions on SI8651BB-AS1, and how do they operate?
SI8651BB-AS1 has two enable pins: EN1 (on VDD1 side) controls output A5; EN2 (on VDD2 side) controls outputs B1–B4. Both are active-high with internal 2 µA pull-ups. When disabled (EN = L), respective outputs enter high-impedance state. This behavior is documented in Table 3.2 and Figure 4.1 of the SI8651BB-AS1 datasheet.
Is SI8651BB-AS1 compatible with 2.5 V and 3.3 V logic interfaces?
Yes, SI8651BB-AS1 supports 2.5–5.5 V on both VDD1 and VDD2 sides. Input thresholds (VT+ = 1.67 V, VT– = 1.23 V) and output drive (VOH ≥ VDD–0.4 V) ensure reliable interfacing with 2.5 V and 3.3 V MCUs and peripherals without external level shifters - verified in Tables 4.2 and 4.3 of the SI8651BB-AS1 datasheet.
How does SI8651BB-AS1 achieve its 50 kV/µs common-mode transient immunity?
The SI8651BB-AS1 achieves 50 kV/µs CMTI through its RF-based modulation architecture and optimized semiconductor isolation barrier design, which inherently rejects fast common-mode edges. This value is measured per Figure 4.3 test circuit and specified in Table 4.2 of the SI8651BB-AS1 datasheet - no external components are needed to meet this rating.
SI8651BB-AS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 2500Vrms
- 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
SI8651BB-AS1 FAQ
1.How can I place an order for SI8651BB-AS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8651BB-AS1 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 SI8651BB-AS1 reliable?
The price and inventory of SI8651BB-AS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8651BB-AS1 is usually 5 days.
3.What payment methods are accepted for SI8651BB-AS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8651BB-AS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8651BB-AS1?
SI8651BB-AS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8651BB-AS1 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 SI8651BB-AS1?
For technical support, including SI8651BB-AS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8651BB-AS1 requirements.
6.How does Aetrix verify that SI8651BB-AS1 is sourced from the original manufacturer or authorized distributors?
All SI8651BB-AS1 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 SI8651BB-AS1 meets industry standards.
7.What is the process for return or replacement of SI8651BB-AS1?
All SI8651BB-AS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8651BB-AS1, 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 SI8651BB-AS1 part is unused and in its original packaging.
Return procedure for SI8651BB-AS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8651BB-AS1 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…
