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Skyworks Solutions Inc. SI8451BB-A-IS1R
- Part No.:
- SI8451BB-A-IS1R
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8451BB-A-IS1R.pdf
- Description:
- DGTL ISO 2500VRMS 5CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,665
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Product details
Overview
SI8451BB-A-IS1R 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, 0.5 ns channel-channel skew, and 25 kV/µs common-mode transient immunity. It operates across 2.70–5.5 V supply rails and delivers <8.6 mA per channel at 100 Mbps (5 V), enabling high-speed isolation in motor control and isolated ADC interfaces.
For engineers reviewing the SI8451BB-A-IS1R datasheet, SI8451BB-A-IS1R pinout, SI8451BB-A-IS1R application, or SI8451BB-A-IS1R equivalent, this page provides verified specifications, safety-certified isolation parameters, real-world timing performance, and validated alternative options for industrial and automotive signal isolation designs.
Technical Context
The SI8451BB-A-IS1R implements capacitive CMOS isolation with differential RF signaling across an internal dielectric barrier, delivering reinforced insulation rated to 2500 VRMS and certified to UL 1577, CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2. Its architecture supports independent bidirectional channel operation without start-up initialization.
It features integrated enable control with 5–8 ns enable-to-data-valid latency, precise timing stability over –40 to +125 °C at full 150 Mbps, and output impedance of 85 Ω ±40% for controlled-impedance PCB trace matching. The device achieves 6 ns minimum pulse width and 1.5 ns typical pulse width distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 5 independent unidirectional isolation channels - enables compact integration of multiple isolated signals in single-package layout. |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces including SPI, RS-485 transceiver control, and isolated gate driver feedback loops. |
| Propagation Delay | 3.0–9.5 ns - ensures sub-10 ns timing predictability critical for closed-loop motor control and real-time power converter synchronization. |
| Channel-Channel Skew | 0.5 ns typical - guarantees tight inter-channel timing alignment for multi-bit parallel isolation (e.g., isolated ADC data bus). |
| Isolation Voltage | 2500 VRMS (1 min) - meets reinforced insulation requirements for industrial PLC I/O modules and EV battery management systems. |
| Supply Voltage Range | 2.70–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting. |
| CMTI | 25 kV/µs - suppresses noise-induced glitches in high-dV/dt environments like inverters and switch-mode power supplies. |
Pinout & Package
SI8451BB-A-IS1R is housed in a 16-pin narrow-body SOIC (SOIC-16 NB) package with 1.27 mm pitch, 10.3 mm × 6.4 mm body size, and creepage/clearance of 4.01 mm / 4.9 mm per IEC 60664-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | Power input for side 1 (pins 1–8); must be decoupled with 0.1 µF ceramic capacitor near pin. |
| GND1 | Primary-side ground | Reference for side 1 logic and isolation barrier input circuitry; separate from GND2 to maintain isolation integrity. |
| IN1–IN5 | Input signals (side 1) | Five TTL/CMOS-compatible inputs accepting 2.0 V VIH / 0.8 V VIL; drive internal RF modulator. |
| EN | Enable control | Active-high enable; outputs go high-impedance when low; 5–8 ns enable-to-output response time. |
| VDD2 | Secondary-side supply | Independent power for side 2 (pins 9–16); supports asymmetrical rail configurations (e.g., 3.3 V/5 V). |
| GND2 | Secondary-side ground | Reference for side 2 outputs; galvanically isolated from GND1; forms isolation barrier return path. |
| OUT1–OUT5 | Output signals (side 2) | Five buffered CMOS outputs with VOH ≥ VDD2–0.4 V and VOL ≤ 0.4 V; 85 Ω nominal output impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power operation | 8.6 mA per channel at 100 Mbps (5 V), enabling thermal-constrained designs in sealed enclosures or high-density PCBs. |
| No start-up initialization | Valid output data within 15–40 µs of power application - eliminates boot-time delays in safety-critical power-on sequencing. |
| Precision timing | 0.5 ns channel-channel skew and 1.5 ns pulse width distortion - preserves signal integrity in time-sensitive encoder or PWM feedback paths. |
| High EMI immunity | 25 kV/µs CMTI and stable operation across –40 to +125 °C - maintains reliability in noisy factory-floor or under-hood automotive environments. |
| Safety certifications | UL 1577 (2500 VRMS), CSA 5A (IEC 60950-1/61010-1), VDE IEC 60747-5-2 - simplifies system-level safety compliance for industrial and medical equipment. |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter drives. IC Role / Device Role / Timing Role: Five-channel isolator separates MCU-side logic from high-voltage power stage, preserving timing-critical dead-time control. Use Value: 0.5 ns channel-channel skew ensures synchronized switching across all three phases, minimizing shoot-through risk. |
Use Scenario: Transmitting 16-bit ADC conversion results across isolation barrier in precision current/voltage monitoring. IC Role / Device Role / Timing Role: Transfers parallel ADC output bits while maintaining inter-bit timing alignment for accurate sampling reconstruction. Use Value: 150 Mbps capability supports >1 MSPS sampling rates with margin; 25 kV/µs CMTI rejects inverter noise coupling into analog domain. |
| Hybrid Electric Vehicle Battery Management | Isolated Switch-Mode Power Supply |
|
Use Scenario: Isolating cell voltage measurement data and pack contactor control signals in high-voltage battery packs. IC Role / Device Role / Timing Role: Provides reinforced insulation between 400–800 V battery domain and 12 V MCU domain. Use Value: 2500 VRMS rating and 560 Vpeak working voltage meet ISO 6469-3 requirements for EV traction battery systems. |
Use Scenario: Isolating feedback signals (voltage/current sense) and PWM control lines in isolated DC-DC converters. IC Role / Device Role / Timing Role: Enables fast, low-latency communication of error amplifier output to primary-side controller across isolation barrier. Use Value: Sub-10 ns propagation delay allows tight regulation loop bandwidth; 2.7–5.5 V dual-rail support matches typical SMPS auxiliary and main supplies. |
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 pin; higher 100 Mbps supply current (12.5 mA/ch @ 5 V). | Lacks fifth channel and EN control - requires external logic or additional isolator for enable functionality. | Select when four channels suffice and enable control is implemented externally; verify layout compatibility with ADI's different pinout. |
| ISO6751QDWR | Five-channel, 50 Mbps, 5000 VRMS, SOIC-16; lower speed but higher isolation rating; 3.0–5.5 V supply only. | Not suitable for >50 Mbps interfaces (e.g., high-speed SPI); preferred where enhanced isolation voltage is mandatory. | Choose for ultra-high-isolation applications (e.g., medical mains-connected devices) where data rate ≤50 Mbps is acceptable. |
Compared with SI8451BB-A-IS1R, ADUM141D1BRZ offers identical speed but fewer channels and no enable, while ISO6751QDWR trades speed for double the isolation voltage - making SI8451BB-A-IS1R optimal for balanced high-speed, five-channel, enable-controlled industrial isolation.
Availability
SI8451BB-A-IS1R is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle battery management, and isolated switch-mode power supply designs requiring stable component supply, long-term lifecycle support, and safety-certified isolation performance.
Supply support for SI8451BB-A-IS1R 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 communications, automotive, and industrial markets.
The Si84xx family was designed to replace optocouplers with CMOS-based digital isolators offering superior speed, power efficiency, and reliability - specifically targeting high-noise, high-reliability applications in motor drives and energy systems.
FAQ
What is the maximum operating temperature for SI8451BB-A-IS1R at full 150 Mbps data rate?
The SI8451BB-A-IS1R is fully specified for operation from –40 °C to +125 °C at 150 Mbps with 15 pF load and 5 V supply. This rating is confirmed in Table 1 (Recommended Operating Conditions) and applies across the full supply range (2.70–5.5 V) when ambient conditions and loading comply with datasheet limits. SI8451BB-A-IS1R maintains timing and isolation integrity throughout this range.
Does SI8451BB-A-IS1R require external components for basic operation?
SI8451BB-A-IS1R requires only 0.1 µF bypass capacitors on VDD1 and VDD2 pins - no external resistors, transformers, or timing components are needed. The device has no start-up initialization sequence and begins passing valid data within 40 µs of power application. SI8451BB-A-IS1R integrates all isolation circuitry on-die, eliminating external BOM complexity.
How does the enable (EN) pin function on SI8451BB-A-IS1R?
The EN pin on SI8451BB-A-IS1R is active-high and places all five outputs in high-impedance state when driven low. Enable-to-data-valid delay is 5.0–8.0 ns, and enable-to-tri-state delay is 7.0–9.2 ns. This allows dynamic channel gating in real-time control systems. SI8451BB-A-IS1R does not invert input signals; EN controls output drivers only.
What safety certifications apply to SI8451BB-A-IS1R?
SI8451BB-A-IS1R is certified to UL 1577 (2500 VRMS, File E257455), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (File 5006301-4880-0001). These cover reinforced insulation up to 560 Vpeak working voltage and 2500 VRMS withstand, validated per production test at 3000 VRMS for 1 second. SI8451BB-A-IS1R meets requirements for industrial and automotive safety standards.
Can SI8451BB-A-IS1R operate with mismatched supply voltages on each side?
Yes - SI8451BB-A-IS1R supports independent VDD1 and VDD2 supplies ranging from 2.70 V to 5.5 V each, enabling mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V analog circuit). Input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive strength (VOH ≥ VDD–0.4 V) are maintained across the full range. SI8451BB-A-IS1R tolerates asymmetrical rail configurations without derating.
SI8451BB-A-IS1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 2500Vrms
- 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
SI8451BB-A-IS1R FAQ
1.How can I place an order for SI8451BB-A-IS1R through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8451BB-A-IS1R 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 SI8451BB-A-IS1R reliable?
The price and inventory of SI8451BB-A-IS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8451BB-A-IS1R is usually 5 days.
3.What payment methods are accepted for SI8451BB-A-IS1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8451BB-A-IS1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8451BB-A-IS1R?
SI8451BB-A-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8451BB-A-IS1R 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 SI8451BB-A-IS1R?
For technical support, including SI8451BB-A-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8451BB-A-IS1R requirements.
6.How does Aetrix verify that SI8451BB-A-IS1R is sourced from the original manufacturer or authorized distributors?
All SI8451BB-A-IS1R 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 SI8451BB-A-IS1R meets industry standards.
7.What is the process for return or replacement of SI8451BB-A-IS1R?
All SI8451BB-A-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8451BB-A-IS1R, 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 SI8451BB-A-IS1R part is unused and in its original packaging.
Return procedure for SI8451BB-A-IS1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8451BB-A-IS1R 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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