My Inquiry
My Account
Skyworks Solutions Inc. SI8635BD-AS
- Part No.:
- SI8635BD-AS
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8635BD-AS.pdf
- Description:
- AUTOMOTIVE 5 KV 3-CHANNEL DIGITA
- Quantity:
- Payment:
- Shipping:
Inventory:3,725
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI8635BD-AS from Skyworks is an automotive-grade triple-channel digital isolator with 3 input channels on VDD1 side and 0 on VDD2 side, 5 kVRMS reinforced isolation, 150 Mbps data rate, and fail-safe default-low output state. It operates across –40 to +125 °C and delivers ultra-low power consumption (1.6 mA/channel at 1 Mbps, 5.5 mA/channel at 100 Mbps @ 5 V), enabling robust signal isolation in high-noise traction inverter gate drive circuits.
For engineers reviewing the SI8635BD-AS datasheet, SI8635BD-AS pinout, SI8635BD-AS application, or SI8635BD-AS equivalent, this page provides verified technical context, exact pin functions, real-world automotive use cases, and two validated alternative parts - all grounded in Skyworks' official Si8630/31/35 datasheet (Rev. 206522A, March 2023).
Technical Context
The SI8635BD-AS implements RF-based on/off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and delivering stable timing performance across temperature and lifetime. Its architecture features Schmitt-trigger inputs for noise immunity and independent undervoltage lockout (UVLO) on both VDD1 and VDD2 sides.
All three channels are unidirectional (VDD1 → VDD2), with no enable pins (EN1/EN2 = NC per Table 3.2), and default-low fail-safe behavior activated during input-side power loss while output supply remains active. Propagation delay is tightly controlled at 5–13 ns (typ. 8 ns), with channel-channel skew ≤2.5 ns and pulse width distortion ≤4.5 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 3 unidirectional (A1→B1, A2→B2, A3→B3); no reverse channels or enables |
| Isolation Rating | 5 kVRMS reinforced insulation (VDE 0884-10, UL 1577, CSA 5A, CQC GB4943.1) |
| Max Data Rate | 150 Mbps - supports high-speed PWM feedback and fast serial communication in inverters |
| Propagation Delay | 5–13 ns (typ. 8 ns) - enables precise timing-critical gate drive synchronization |
| Supply Voltage | 2.5–5.5 V on both sides - interoperable with 3.3 V MCU logic and 5 V analog domains |
| Fail-Safe Mode | Default-low output during VDD1 loss - ensures safe shutdown of downstream power stages |
| CMTI | ≥50 kV/µs (Si863xxB/C/D grade) - withstands high dv/dt noise in motor drives and battery systems |
Pinout & Package
SI8635BD-AS uses a RoHS-compliant wide-body SOIC-16 package (10.3 mm × 7.5 mm, creepage ≥8.3 mm), qualified for reinforced insulation up to 5 kVRMS and rated for automotive AEC-Q100 Grade 1 (–40 to +125 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies 2.5–5.5 V to input logic and RF transmitter; bypassed with 0.1 µF capacitor |
| GND1 | Input-side ground reference | Return path for VDD1; must be separated from GND2 by ≥8.3 mm creepage |
| A1, A2, A3 | Digital input signals (VDD1 side) | Schmitt-trigger inputs tolerate slow edges and reject >0.44 V hysteresis noise |
| VDD2 | Output-side power supply | Supplies 2.5–5.5 V to RF receiver and output drivers; bypassed with 0.1 µF capacitor |
| GND2 | Output-side ground reference | Isolated return for VDD2; forms safety barrier with GND1 |
| B1, B2, B3 | Digital output signals (VDD2 side) | 50 Ω nominal output impedance; drives 15 pF loads with <4 ns rise/fall times |
| NC (Pins 1, 2, 15, 16) | No-connect terminals | Not internally bonded; may be left floating, tied to VDD2, or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED aging and temperature drift; enables 60-year life at rated working voltage |
| Selectably fail-safe output | Low-default state ensures safe deactivation of IGBT/MOSFET gates during controller power loss |
| Ultra-low power at 100 Mbps | 5.5 mA per channel @ 5 V - reduces thermal load in sealed automotive modules |
| High CMTI (≥50 kV/µs) | Prevents false triggering in high dv/dt environments like traction inverters and OBCs |
| Automotive qualification | AEC-Q100 Grade 1, AIAG PPAP support, IMDS/CAMDS compliance - meets OEM production requirements |
Applications
| Traction Inverter Gate Drive | On-Board Charger (OBC) Control |
|---|---|
|
Use Scenario: Isolating PWM signals from MCU to IGBT/SiC gate drivers in EV powertrain inverters. IC Role / Device Role / Timing Role: Unidirectional signal isolator transmitting three independent gate control signals across reinforced 5 kVRMS barrier. Use Value: Enables precise <13 ns propagation delay and <2.5 ns channel skew for synchronized multi-phase switching, while CMTI ≥50 kV/µs prevents noise-induced shoot-through. |
Use Scenario: Isolating digital control and status signals between primary-side controller and secondary-side monitoring in bidirectional OBCs. IC Role / Device Role / Timing Role: Three-channel isolator transferring enable, fault, and sync signals across safety barrier with fail-safe low default. Use Value: Guarantees safe shutdown (B1–B3 → low) if primary-side MCU loses power, preventing uncontrolled charging or discharging. |
| Battery Management System (BMS) Communication | Industrial Motor Drive Interface |
|
Use Scenario: Isolating UART or SPI lines between isolated cell monitor ICs and system MCU in high-voltage battery packs. IC Role / Device Role / Timing Role: High-reliability isolator supporting 150 Mbps burst-mode communication for cell voltage/temperature reporting. Use Value: Delivers 1.6 mA/channel @ 1 Mbps - extends runtime in always-on BMS monitoring circuits without compromising isolation integrity. |
Use Scenario: Isolating encoder feedback, enable, and fault signals in servo drives operating in noisy factory environments. IC Role / Device Role / Timing Role: Robust 3-channel isolator interfacing industrial PLC outputs to motor control logic with Schmitt-trigger noise rejection. Use Value: With –40 to +125 °C operation and 5 kVRMS rating, maintains signal integrity in harsh ambient conditions where optocouplers degrade. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI8635BD-BIS | Industrial-grade (–I suffix); identical electrical specs, package, and pinout; lacks AEC-Q100 qualification and PPAP documentation | Approved for industrial automation but not automotive production; unsuitable for OEM BMS or inverter programs requiring AIAG compliance | Select SI8635BD-BIS only for non-automotive designs where AEC-Q100 and PPAP are not required. |
| ADUM3401BRWZ | Analog Devices quad-channel isolator; 100 Mbps max, 2.5–5.5 V supply, 2.5 kVRMS rating, no automotive qualification | Lacks reinforced 5 kVRMS rating and AEC-Q100; requires PCB redesign due to different pin count (16-pin SOIC vs. 16-pin SOIC but different pin mapping) | Use ADUM3401BRWZ only in cost-sensitive industrial applications where 2.5 kVRMS suffices and layout changes are acceptable. |
Compared with SI8635BD-BIS, the SI8635BD-AS adds automotive process controls, PPAP, and IMDS support without electrical trade-offs; versus ADUM3401BRWZ, it offers higher isolation, faster speed, and guaranteed automotive reliability - making SI8635BD-AS the sole choice for production EV power electronics.
Availability
SI8635BD-AS is available at Aetrix Electronics and suitable for traction inverters, on-board chargers, and battery management systems requiring stable component supply, long-term automotive lifecycle support, and certified reinforced isolation.
Supply support for SI8635BD-AS 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 SI8635BD-AS belongs to Skyworks' Si863x family of ultra-low-power digital isolators, designed specifically for automotive and industrial systems demanding high-speed, high-reliability galvanic isolation under extreme thermal and EMI stress.
FAQ
What is the isolation rating and certification status of the SI8635BD-AS?
The SI8635BD-AS provides 5 kVRMS reinforced isolation and is certified to UL 1577, CSA Component Notice 5A, VDE 0884-10 (reinforced), IEC 60950-1, IEC 61010-1, IEC 60601-1, and CQC GB4943.1. These certifications validate its suitability for safety-critical automotive applications including traction inverters and on-board chargers where reinforced insulation is mandated.
Does the SI8635BD-AS support bidirectional communication?
No, the SI8635BD-AS is strictly unidirectional: all three channels (A1→B1, A2→B2, A3→B3) transmit only from the VDD1 side to the VDD2 side. It has no reverse channels or enable pins - confirmed by Table 1.1 (Ordering Guide) and Table 3.2 (Enable Input Truth) in the Si8630/31/35 datasheet.
What is the default output behavior of the SI8635BD-AS during input-side power loss?
The SI8635BD-AS is configured for fail-safe default-low output (per "BD" in ordering code and Table 1.1). When VDD1 is unpowered but VDD2 remains active, outputs B1–B3 transition to logic low within 12 ns (tSD parameter), ensuring safe deactivation of downstream power devices in automotive systems.
How does the SI8635BD-AS achieve ultra-low power consumption at high data rates?
The SI8635BD-AS uses RF-based on/off keying instead of pulse-width or edge-detection schemes, achieving 5.5 mA per channel at 100 Mbps and 5 V supply. This architecture minimizes dynamic current draw while maintaining sub-13 ns propagation delay - a key advantage over legacy optocouplers and competing capacitive isolators.
Is the SI8635BD-AS pin-compatible with other Si863x variants?
Yes, the SI8635BD-AS shares identical wide-body SOIC-16 pinout and footprint with all Si863x devices in the same package variant (e.g., SI8635BB-AS, SI8635BC-AS), including matching VDD1/GND1/A1–A3/VDD2/GND2/B1–B3 assignments. Pin compatibility is confirmed in Section 5 (Pin Descriptions) and Figure 6 (Package Outline) of the datasheet.
SI8635BD-AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- 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:
- 3
- Inputs - Side 1/Side 2:
- 3/0
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8635BD-AS FAQ
1.How can I place an order for SI8635BD-AS through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8635BD-AS 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 SI8635BD-AS reliable?
The price and inventory of SI8635BD-AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8635BD-AS is usually 5 days.
3.What payment methods are accepted for SI8635BD-AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8635BD-AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8635BD-AS?
SI8635BD-AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8635BD-AS 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 SI8635BD-AS?
For technical support, including SI8635BD-AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8635BD-AS requirements.
6.How does Aetrix verify that SI8635BD-AS is sourced from the original manufacturer or authorized distributors?
All SI8635BD-AS 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 SI8635BD-AS meets industry standards.
7.What is the process for return or replacement of SI8635BD-AS?
All SI8635BD-AS units undergo pre-shipment inspection (PSI). If there is an issue with SI8635BD-AS, 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 SI8635BD-AS part is unused and in its original packaging.
Return procedure for SI8635BD-AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8635BD-AS 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…
