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Skyworks Solutions Inc. SI8451BA-A-IS1
- Part No.:
- SI8451BA-A-IS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8451BA-A-IS1.pdf
- Description:
- DGTL ISO 1000VRMS 5CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,190
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Product details
Overview
SI8451BA-A-IS1 from Skyworks Solutions is a five-channel, ultra-low-power digital isolator in a 16-pin narrow-body SOIC package, supporting up to 150 Mbps data rate with worst-case propagation delay <9.5 ns, 2.7–5.5 V dual supply operation, and 2500 VRMS reinforced isolation for industrial motor control and isolated power conversion.
For engineers reviewing the SI8451BA-A-IS1 datasheet, SI8451BA-A-IS1 pinout, SI8451BA-A-IS1 application, or SI8451BA-A-IS1 equivalent, this page delivers verified timing specs, channel configuration, safety certifications (UL/CSA/VDE), and real-world design constraints including CMTI ≥25 kV/µs and pulse width distortion ≤2.5 ns at 150 Mbps.
Technical Context
The SI8451BA-A-IS1 implements capacitive isolation with on-chip RF modulation/demodulation across five independent bidirectional channels, each featuring integrated enable control and precise edge-aligned timing. Its architecture eliminates start-up initialization and supports asymmetric supply voltages (VDD1 ≠ VDD2) while maintaining stable propagation delay skew ≤1.8 ns between channels.
It operates across –40 °C to +125 °C at full 150 Mbps, with output impedance ≈85 Ω ±40% for controlled-impedance PCB routing, and meets IEC 60747-5-2 (VDE 0884-2) for reinforced insulation up to 560 VPEAK working voltage and 1050 VPEAK production test voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - enables high-speed serial interfaces (e.g., isolated SPI, RS-485 PHY control) without oversampling or clock recovery circuitry |
| Propagation Delay (tPLH/tPHL) | 3.0–9.5 ns - ensures deterministic timing in closed-loop motor control and fast ADC/DAC sampling synchronization |
| Channel-Channel Skew | ≤1.8 ns - guarantees simultaneous sampling across multiple isolated analog inputs or synchronized PWM outputs |
| Common-Mode Transient Immunity | ≥25 kV/µs - maintains signal integrity in noisy environments like inverter gate drivers and industrial PLC backplanes |
| Isolation Withstand Voltage | 2500 VRMS - certified for reinforced insulation per UL 1577, CSA Component Notice 5A, and VDE IEC 60747-5-2 |
| Supply Voltage Range | 2.70–5.5 V per side - supports direct interfacing with 3.3 V microcontrollers and 5 V legacy logic without level shifters |
| Power Consumption @ 100 Mbps | 8.6–10.8 mA (VDD1), 20.4–25.5 mA (VDD2) at 5 V - enables low-heat dissipation in space-constrained isolated DC-DC feedback paths |
Pinout & Package
SI8451BA-A-IS1 is housed in a 16-pin narrow-body SOIC (SOIC-16 NB) package with 1.27 mm pitch, 10.3 mm × 7.5 mm footprint, and 2.35 mm max height. Pin 1 is marked by a beveled corner or dot; pins 1–8 form the primary-side interface, pins 9–16 the secondary-side interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | Accepts 2.7–5.5 V; powers input receivers and channel A–E transmitters on side 1 |
| GND1 | Primary-side ground | Reference for VDD1 and all side-1 I/O; must be separated from GND2 by isolation barrier |
| EN1 | Primary-side enable input | Active-high control: drives all side-1 outputs low when low; enables fast shutdown of isolated communication links |
| IN1–IN5 | Primary-side digital inputs | CMOS-compatible inputs (VIH ≥2.0 V, VIL ≤0.8 V); accept signals from MCU GPIO or logic gates |
| VDD2 | Secondary-side supply | Independent 2.7–5.5 V supply; powers output drivers and side-2 receivers |
| GND2 | Secondary-side ground | Reference for VDD2 and side-2 outputs; galvanically isolated from GND1 |
| EN2 | Secondary-side enable input | Active-high control for side-2 outputs; allows independent tri-state control of isolated outputs |
| OUT1–OUT5 | Secondary-side digital outputs | Push-pull CMOS outputs (VOH ≥VDD2–0.4 V, VOL ≤0.4 V); drive loads up to 10 mA per channel |
Key Features
| Feature | Design Value |
|---|---|
| No start-up initialization | Valid data appears within 40 µs of power application - eliminates boot-time delays in safety-critical systems |
| Precision timing | Worst-case pulse width distortion ≤2.5 ns and channel skew ≤1.8 ns - preserves signal integrity in high-resolution encoder interfaces |
| Ultra-low-power operation | <4.4 mA per side at 10 Mbps (5 V), <6.2 mA per side at 100 Mbps (2.7 V) - reduces thermal load in sealed enclosures |
| High electromagnetic immunity | CMTI ≥25 kV/µs - prevents false triggering during fast-switching events in motor drives and SMPS |
| RoHS-compliant packaging | Lead-free SOIC-16 NB with halogen-free molding compound - meets industrial environmental compliance requirements |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
Use Scenario: Isolating PWM gate-drive signals and current-sense feedback in three-phase inverter stacks. IC Role / Device Role / Timing Role: Five-channel isolator transmitting gate enable/disable commands and analog-to-digital converter outputs across isolation barrier. Use Value: Enables precise dead-time control with ≤1.8 ns channel skew and withstands >25 kV/µs transients from IGBT switching. |
Use Scenario: Providing feedback path for secondary-side voltage regulation while maintaining safety isolation in AC/DC converters. IC Role / Device Role / Timing Role: Transmitting error amplifier output and synchronous rectifier control signals across 2500 VRMS barrier. Use Value: Supports 150 Mbps data rate for fast transient response and maintains stable timing under wide temperature range (–40 to 125 °C). |
| Isolated Data Acquisition | Hybrid Electric Vehicle Battery Management |
Use Scenario: Interfacing isolated ADCs and DACs in high-voltage battery monitoring systems. IC Role / Device Role / Timing Role: Transmitting multi-channel sensor data (voltage, temperature, current) from high-side to low-side controller. Use Value: Delivers ≤9.5 ns propagation delay and ≤2.5 ns pulse width distortion for sub-microsecond sampling alignment. |
Use Scenario: Isolating cell voltage measurement and contactor control signals in EV battery packs rated up to 1000 V DC. IC Role / Device Role / Timing Role: Five independent channels carrying BMS fault signals, cell balancing commands, and isolation status flags. Use Value: Certified to 2500 VRMS reinforced insulation and 60-year lifetime at rated voltage per VDE IEC 60747-5-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM141D1BRZ | Four-channel, 150 Mbps, 2.5 kVRMS, SOIC-16; no enable pins; higher typical supply current at 100 Mbps (12.5 mA/side) | Lacks dedicated enable control per side; unsuitable where fast output disable is required for fault containment | Select when four channels suffice and enable functionality is not needed; verify layout compatibility with different pinout |
| ISO6751QDWR | Five-channel, 50 Mbps, 5 kVRMS, SOIC-16; lower speed but higher isolation rating; supports 1.8–5.5 V supplies | Insufficient for 100+ Mbps interfaces (e.g., high-res encoder feedback); better suited for high-isolation, low-speed BMS monitoring | Choose for applications requiring >3.75 kVRMS isolation where data rate ≤50 Mbps is acceptable |
Compared with ADUM141D1BRZ and ISO6751QDWR, SI8451BA-A-IS1 uniquely combines five-channel count, 150 Mbps speed, per-side enable control, and 2.5 kVRMS certification in a standard SOIC-16 NB footprint-making it optimal for space-constrained, high-speed industrial isolation where dynamic output control is critical.
Availability
SI8451BA-A-IS1 is available at Aetrix Electronics and suitable for industrial motor control, isolated switch-mode power supplies, and hybrid electric vehicle battery management systems requiring stable component supply and long-term lifecycle support.
Supply support for SI8451BA-A-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 Si84xx family was designed specifically for high-reliability industrial and automotive isolation applications demanding low power, precise timing, and robust safety certification-targeting motor drives, power conversion, and battery management systems.
FAQ
What is the maximum operating temperature for SI8451BA-A-IS1 at full 150 Mbps data rate?
The SI8451BA-A-IS1 operates reliably from –40 °C to +125 °C at 150 Mbps with 15 pF load and 5 V supply, as confirmed in Table 1 and Figure 3 of the datasheet. Thermal derating begins above 125 °C case temperature per DIN EN 60747-5-2, and the device's 105 °C/W junction-to-air thermal resistance requires appropriate PCB copper area for sustained high-speed operation.
Does SI8451BA-A-IS1 support independent supply voltages on primary and secondary sides?
Yes, SI8451BA-A-IS1 supports fully independent VDD1 and VDD2 supplies ranging from 2.70 V to 5.5 V each, enabling interoperability between 3.3 V microcontrollers and 5 V peripheral logic without external level shifters. This is explicitly specified in Table 1 (Recommended Operating Conditions) and validated across all electrical characteristics tables.
What safety certifications apply to SI8451BA-A-IS1?
SI8451BA-A-IS1 is certified to UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (reinforced insulation). These certifications cover the full 16-pin narrow-body SOIC package and are production-tested to 3000 VRMS for 1 second, as documented in Tables 6 and 7 of the datasheet.
How does the enable function operate on SI8451BA-A-IS1?
SI8451BA-A-IS1 features two independent enable inputs: EN1 controls side-1 outputs (driving them low when inactive), and EN2 controls side-2 outputs (placing them in high-impedance state when inactive). Enable-to-data-valid delay is ≤8.0 ns, enabling rapid fault containment in safety-critical systems, as shown in Figure 1 and Table 3.
Is SI8451BA-A-IS1 recommended for new designs?
No-Skyworks marks SI8451BA-A-IS1 as "Not Recommended for New Designs" in Rev. 1.6 of the datasheet (August 2021). While fully functional and supported, designers should evaluate newer alternatives such as the Si86xx or Si88xx families for enhanced performance, extended temperature range, or improved power efficiency in greenfield projects.
SI8451BA-A-IS1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- 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:
- 1000Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs (Typ)
- Data Rate:
- 150Mbps
- Propagation Delay tpLH / tpHL (Max):
- 9.5ns, 9.5ns
- Pulse Width Distortion (Max):
- 2.5ns
- Rise / Fall Time (Typ):
- 3.8ns, 2.8ns
- Voltage - Supply:
- 2.7V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SI8451BA-A-IS1 FAQ
1.How can I place an order for SI8451BA-A-IS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8451BA-A-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 SI8451BA-A-IS1 reliable?
The price and inventory of SI8451BA-A-IS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8451BA-A-IS1 is usually 5 days.
3.What payment methods are accepted for SI8451BA-A-IS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8451BA-A-IS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8451BA-A-IS1?
SI8451BA-A-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8451BA-A-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 SI8451BA-A-IS1?
For technical support, including SI8451BA-A-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8451BA-A-IS1 requirements.
6.How does Aetrix verify that SI8451BA-A-IS1 is sourced from the original manufacturer or authorized distributors?
All SI8451BA-A-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 SI8451BA-A-IS1 meets industry standards.
7.What is the process for return or replacement of SI8451BA-A-IS1?
All SI8451BA-A-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8451BA-A-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 SI8451BA-A-IS1 part is unused and in its original packaging.
Return procedure for SI8451BA-A-IS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8451BA-A-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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