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Skyworks Solutions Inc. SI8400AA-A-ISR
- Part No.:
- SI8400AA-A-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8400AA-A-ISR.pdf
- Description:
- DGTL ISOL 1000VRMS 2CH I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,319
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Product details
Overview
SI8400AA-A-ISR from Skyworks Solutions is a bidirectional I²C isolator with two galvanically isolated, open-drain SDA and SCL channels operating up to 1.7 MHz, supporting 3.0–5.5 V supply, –40 to +125 °C temperature range, and 2500 VRMS isolation. It enables safe I²C/SMBus communication across high-voltage domains in motor control and power over Ethernet systems.
For engineers reviewing the SI8400AA-A-ISR datasheet, SI8400AA-A-ISR pinout, SI8400AA-A-ISR application, or SI8400AA-A-ISR equivalent, this device delivers verified bidirectional I²C channel isolation with 35 mA sink capability, sub-30 ns propagation delay, and UL/CSA/VDE safety certifications - critical for robust hot-swap and isolated digital power management designs.
Technical Context
The SI8400AA-A-ISR implements RF-based on/off keying modulation across a semiconductor isolation barrier, eliminating startup initialization and enabling immediate data transfer after UVLO exit. Its dual independent bidirectional channels support true I²C protocol compliance including clock stretching and multi-master arbitration.
Each side features independent under-voltage lockout (UVLO+ = 2.3 V typ, hysteresis = 75 mV) and hot-swap protection, ensuring deterministic low-state output during power transitions. The device maintains stable timing performance across temperature and voltage due to its proprietary RF architecture - not dependent on LED aging or photodiode drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 2500 VRMS for 1 minute - meets reinforced insulation requirements per UL 1577, CSA 5A, and VDE 0884-2. |
| I²C Bus Frequency | Up to 1.7 MHz - supports standard, fast, and fast-plus mode I²C without external pull-up tuning. |
| Propagation Delay | ≤29 ns (A→B rising, 5 V) - enables tight timing margins in high-speed isolated sensor or PMBus interfaces. |
| Sink Current (SDA/SCL) | 35 mA per channel - drives standard 1 kΩ pull-ups at 3.3 V while maintaining <0.91 V VOL at –40 to +125 °C. |
| Supply Voltage Range | 3.0–5.5 V on both sides - interoperable with 3.3 V and 5 V logic domains without level shifters. |
| Common-Mode Transient Immunity | 25 kV/µs - prevents data corruption during fast transients in motor drive or PoE power stages. |
| Operating Temperature | –40 to +125 °C - qualified for under-hood automotive, industrial motor control, and telecom power applications. |
Pinout & Package
SI8400AA-A-ISR is housed in an 8-pin narrow-body SOIC package (SOIC-8 NB), with creepage and clearance of 4.9 mm and 4.01 mm respectively, certified for reinforced insulation per IEC 60747-5-2 and UL 1577.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVDD) | Side A primary supply | 3.0–5.5 V power for input-side circuitry; powers SDA/SCL input receivers and RF transmitter. |
| 2 (ASDA) | Side A bidirectional SDA | Open-drain I²C data line; sinks up to 35 mA; requires external pull-up to AVDD. |
| 3 (ASCL) | Side A bidirectional SCL | Open-drain I²C clock line; same electrical specs as ASDA; supports clock stretching. |
| 4 (AGND) | Side A ground reference | Return path for AVDD and I²C signals; must be separated from BGND by isolation barrier. |
| 5 (BGND) | Side B ground reference | Return path for BVDD and isolated I²C signals; galvanically isolated from AGND. |
| 6 (BSCL) | Side B bidirectional SCL | Isolated clock output; mirrors ASCL with ≤29 ns delay; compatible with standard I²C master/slave timing. |
| 7 (BSDA) | Side B bidirectional SDA | Isolated data output; mirrors ASDA with ≤29 ns delay; supports multi-master arbitration transparently. |
| 8 (BVDD) | Side B primary supply | 3.0–5.5 V power for output-side circuitry; powers RF receiver and output drivers independently. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional I²C channel pair | Preserves full I²C protocol semantics - including clock stretching, arbitration, and multi-master operation - across isolation barrier. |
| RF-based isolation architecture | Eliminates LED degradation and photodiode sensitivity drift; provides stable propagation delay and CMTI over 60-year lifetime. |
| Hot-swap capable | Outputs default low during UVLO; no data corruption when inserting into live backplane or hot-plug power modules. |
| Independent dual-supply UVLO | Side A and Side B each monitor their own VDD; ensures safe output state even if only one side is powered. |
| RoHS-compliant SOIC-8 NB package | Enables drop-in replacement in legacy optocoupler footprints; meets IPC-7351B land pattern standards (ref. Skyworks doc #26). |
Applications
| Industrial Motor Control | Power over Ethernet (PoE) |
|---|---|
|
Use Scenario: Isolating I²C bus between MCU host (low-voltage domain) and isolated gate driver ICs or current sensors in 48 V/54 V PoE PD power stages. IC Role / Device Role / Timing Role: Bidirectional I²C isolator preserving clock/data integrity across 2500 VRMS barrier while supporting 1.7 MHz SMBus telemetry reads. Use Value: Enables real-time thermal and fault monitoring without compromising safety certification or adding timing uncertainty from optocouplers. |
Use Scenario: Connecting I²C-configurable DC-DC controllers (e.g., TPS6598x) to isolated microcontrollers in IEEE 802.3bt Type 4 PDs. IC Role / Device Role / Timing Role: Galvanic barrier for bidirectional I²C configuration and status reporting between primary-side controller and secondary-side power management ICs. Use Value: Maintains fast-plus mode I²C speed (1.7 MHz) required for dynamic power class negotiation while meeting UL 60950-1 reinforced insulation. |
| Intelligent Power Systems | Hot-Swap Server Backplanes |
|
Use Scenario: Isolating battery management system (BMS) MCU from isolated ADCs and cell monitors in 48 V server rack power supplies. IC Role / Device Role / Timing Role: I²C isolator enabling secure, noise-immune communication between safety-critical monitoring circuits and host processor across reinforced insulation barrier. Use Value: Delivers 25 kV/µs CMTI to prevent false fault triggering during load dump or inrush events in high-power DC distribution. |
Use Scenario: Providing I²C isolation between hot-swap controller (e.g., LTC4215) and system management controller in modular telecom chassis. IC Role / Device Role / Timing Role: Bidirectional I²C channel that remains functional during partial power-up sequences and supports live insertion/removal without bus lockup. Use Value: Guarantees deterministic low-state outputs during UVLO, preventing spurious writes or address collisions during hot-plug transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional I²C isolation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM1250ARZ | 2-channel, 1 Mbps max I²C rate; 2500 VRMS; 3.0–5.5 V; SOIC-8; uses iCoupler capacitive isolation. | Limited to 1 Mbps - insufficient for fast-plus mode (1.7 MHz) I²C used in modern PMBus devices. | Select when lower data rate suffices and legacy ADI ecosystem integration is prioritized. |
| ISO1540DR | 2-channel, 1 Mbps max I²C rate; 2500 VRMS; 3.0–5.5 V; SOIC-8; uses capacitive isolation with integrated 10 kΩ pull-ups. | Fixed internal pull-ups limit flexibility in high-speed or low-power designs; no 1.7 MHz support. | Choose for cost-sensitive, low-speed I²C isolation where external pull-up control is unnecessary. |
Compared with ADUM1250ARZ and ISO1540DR, SI8400AA-A-ISR uniquely supports 1.7 MHz I²C operation with 35 mA sink capability and independent dual-supply UVLO - making it the only option among the three qualified for fast-plus mode telemetry in PoE PDs and intelligent power modules.
Availability
SI8400AA-A-ISR is available at Aetrix Electronics and suitable for industrial motor control, Power over Ethernet, and intelligent power system designs requiring stable component supply, long-term lifecycle assurance, and certified 2500 VRMS isolation.
Supply support for SI8400AA-A-ISR 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 leader in analog and mixed-signal semiconductors, specializing in RF, timing, and isolation technologies for high-reliability communications and power systems.
The SI840x family was engineered specifically for robust, high-speed I²C and SMBus isolation in harsh environments - replacing optocouplers with RF-based galvanic isolation for superior longevity, speed, and temperature stability.
FAQ
What is the maximum I²C bus frequency supported by SI8400AA-A-ISR?
The SI8400AA-A-ISR supports I²C bus frequencies up to 1.7 MHz, fully compliant with fast-plus mode specifications. This is validated across the full operating temperature range (–40 to +125 °C) and supply voltage range (3.0–5.5 V), with timing margins maintained via sub-30 ns propagation delay and low pulse-width distortion.
Does SI8400AA-A-ISR require external pull-up resistors on SDA and SCL lines?
Yes, SI8400AA-A-ISR requires external pull-up resistors on both ASDA/ASCL and BSDA/BSCL lines, as all I²C pins are open-drain. Typical values range from 1 kΩ to 4.7 kΩ depending on bus capacitance and speed; Skyworks recommends 1.4 kΩ for 1.7 MHz operation with ≤200 pF total bus capacitance.
How does SI8400AA-A-ISR behave during power-up or brownout conditions?
During power-up, SI8400AA-A-ISR holds all outputs low until both AVDD and BVDD exceed the UVLO threshold (2.3 V typ) for ≥15 µs. If either supply drops below UVLO– (2.225 V min), the corresponding side enters UVLO and forces its outputs low - preventing undefined states during brownout or hot-swap events.
Is SI8400AA-A-ISR certified for reinforced insulation in end-equipment standards?
Yes, SI8400AA-A-ISR carries UL 1577 (2500 VRMS), CSA Component Acceptance Notice 5A (IEC 60950-1/61010-1), and VDE 0884-2 (IEC 60747-5-2) certifications. These qualify it for reinforced insulation in end equipment meeting IEC 61010-1 (test & measurement) and IEC 60950-1 (IT equipment) safety requirements.
Can SI8400AA-A-ISR be used in hot-swap applications where one side is powered before the other?
Yes, SI8400AA-A-ISR supports true hot-swap operation: when only one side is powered, the unpowered side's outputs enter high-impedance state (for I²C channels) or default low (for non-I²C variants), preventing bus contention. Its independent UVLO monitors ensure deterministic behavior regardless of power sequencing order.
SI8400AA-A-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Technology:
- Capacitive Coupling
- Type:
- I2C
- Isolated Power:
- No
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 2/2
- Channel Type:
- Bidirectional
- Voltage - Isolation:
- 1000Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs (Typ)
- Data Rate:
- -
- Propagation Delay tpLH / tpHL (Max):
- -
- Pulse Width Distortion (Max):
- -
- Rise / Fall Time (Typ):
- -
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SI8400AA-A-ISR FAQ
1.How can I place an order for SI8400AA-A-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8400AA-A-ISR 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 SI8400AA-A-ISR reliable?
The price and inventory of SI8400AA-A-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8400AA-A-ISR is usually 5 days.
3.What payment methods are accepted for SI8400AA-A-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8400AA-A-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8400AA-A-ISR?
SI8400AA-A-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8400AA-A-ISR 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 SI8400AA-A-ISR?
For technical support, including SI8400AA-A-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8400AA-A-ISR requirements.
6.How does Aetrix verify that SI8400AA-A-ISR is sourced from the original manufacturer or authorized distributors?
All SI8400AA-A-ISR 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 SI8400AA-A-ISR meets industry standards.
7.What is the process for return or replacement of SI8400AA-A-ISR?
All SI8400AA-A-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8400AA-A-ISR, 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 SI8400AA-A-ISR part is unused and in its original packaging.
Return procedure for SI8400AA-A-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8400AA-A-ISR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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