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Skyworks Solutions Inc. SI8451AB-B-IS1
- Part No.:
- SI8451AB-B-IS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8451AB-B-IS1.pdf
- Description:
- DGTL ISO 2500VRMS 5CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,992
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Product details
Overview
SI8451AB-B-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 <9.5 ns worst-case propagation delay, 0.5 ns typical channel-to-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 SI8451AB-B-IS1 datasheet, SI8451AB-B-IS1 pinout, SI8451AB-B-IS1 application, or SI8451AB-B-IS1 equivalent, this page provides verified specifications, safety-certified isolation parameters, real-world timing performance, and validated alternative options for industrial and automotive signal isolation design.
Technical Context
The SI8451AB-B-IS1 implements capacitive isolation with on-chip CMOS drivers and receivers, delivering deterministic timing across –40 °C to +125 °C at 150 Mbps. Its dual-supply architecture (VDD1/VDD2) supports independent 2.70–5.5 V operation on each side, with integrated 85 Ω output impedance matching for controlled-impedance PCB routing.
It features an enable input per side (EN1/EN2) controlling output tri-state behavior, with 5.0–8.0 ns enable-to-data-valid latency and 15–40 µs start-up time. Safety compliance includes UL 1577 (2500 VRMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (560 VPEAK working voltage).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 5 unidirectional isolated channels - enables full-duplex serial interface plus auxiliary control signals in single-package isolation. |
| Max Data Rate | 150 Mbps - supports high-speed SPI, RS-485 transceiver control, and real-time encoder feedback in motor drives. |
| Propagation Delay | 3.0–9.5 ns - ensures sub-10 ns timing predictability for closed-loop control loops requiring tight synchronization. |
| Channel-Channel Skew | 0.5 ns typical - minimizes inter-channel timing mismatch critical for parallel bus isolation (e.g., isolated GPIO banks). |
| Isolation Voltage | 2500 VRMS (1 min) - certified for reinforced insulation in industrial PLC I/O modules and EV battery management systems. |
| CMTI | 25 kV/µs - maintains signal integrity in noisy environments like inverters and switch-mode power supplies. |
| Supply Range | 2.70–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level shifters. |
Pinout & Package
SI8451AB-B-IS1 is housed in a RoHS-compliant 16-pin narrow-body SOIC package (7.5 mm × 10.3 mm, 1.27 mm pitch) with creepage/clearance of 4.01 mm / 4.9 mm and internal isolation barrier separating pins 1–8 (side 1) from pins 9–16 (side 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–5, 7–8 | Side 1 Input/Output | Pins 1–4: isolated input channels; Pin 5: EN1 enable; Pins 7–8: VDD1 and GND1 - defines primary-side logic domain. |
| 9–13, 15–16 | Side 2 Input/Output | Pins 9–12: isolated output channels; Pin 13: EN2 enable; Pins 15–16: VDD2 and GND2 - defines secondary-side logic domain. |
| 6, 14 | NC (No Connect) | Internally unused; must remain unconnected per datasheet - avoids unintended coupling or ESD path disruption. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power at 100 Mbps | 8.6 mA per channel @ 5 V - reduces thermal load in dense PCB layouts and extends battery life in portable isolated sensors. |
| Precision timing control | 1.5 ns pulse width distortion and 2 ns propagation delay skew - preserves signal integrity for high-resolution PWM and encoder clock distribution. |
| Robust EMC performance | 25 kV/µs CMTI and >60-year lifetime at rated voltage - sustains operation in industrial motor drives with fast-switching SiC/GaN FETs. |
| No initialization required | Valid output within 40 µs of power-up - eliminates boot-time delays in safety-critical systems like emergency stop circuits. |
| Safety-certified isolation | UL, CSA, and VDE approvals covering 2500 VRMS withstand and 560 VPEAK working voltage - meets IEC 61800-5-1 and IEC 61508 requirements. |
Applications
| Industrial Motor Control | Isolated ADC/DAC Interface |
|---|---|
|
Use Scenario: Isolating gate driver control signals and current-sense feedback in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Five-channel isolator separates MCU PWM outputs and analog monitor returns across 2.5 kVRMS barrier with <10 ns delay matching. Use Value: Enables precise synchronous switching of IGBTs/SiC FETs while preventing ground loop noise from corrupting current sensing. |
Use Scenario: Bridging precision SAR ADCs and microcontrollers in high-voltage battery monitoring systems. IC Role / Device Role / Timing Role: Provides isolated digital control lines (CS, SCLK, SDI/SDO) and reference voltage return path with <0.5 ns skew. Use Value: Maintains 16-bit ADC accuracy by eliminating common-mode noise coupling into analog measurement paths. |
| Hybrid Electric Vehicle Power Inverters | Programmable Logic Controller I/O Modules |
|
Use Scenario: Isolating high-speed CAN FD communication and DC-link voltage monitoring in traction inverters. IC Role / Device Role / Timing Role: Delivers 150 Mbps throughput and 25 kV/µs CMTI to sustain reliable CAN FD frame transmission amid 10 kV/µs dv/dt transients. Use Value: Prevents communication errors during rapid IGBT switching, ensuring functional safety compliance (ISO 26262 ASIL-D). |
Use Scenario: Providing isolated digital input/output channels for field device interfacing in factory automation cabinets. IC Role / Device Role / Timing Role: Replaces optocouplers with five independent channels supporting 24 V DC inputs and 5 V logic outputs in compact SOIC footprint. Use Value: Reduces BOM count and PCB area vs. discrete opto solutions while improving long-term reliability and temperature stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM141DARZ | 4-channel, 150 Mbps, 2.5 kVRMS, SOIC-16; no enable pins; higher 12.5 mA/channel @ 100 Mbps (5 V) | Lacks dedicated enable control per side - less flexible for dynamic power gating in low-duty-cycle systems. | Choose when only four channels are needed and system-level enable sequencing is handled externally. |
| ISO6751QDR | 5-channel, 50 Mbps, 5 kVRMS, SOIC-16; lower speed but higher isolation rating; 8.5 mA/channel @ 50 Mbps (5 V) | Half the data rate limits use in high-speed serial interfaces but offers enhanced creepage (8 mm) for 600 VRMS mains isolation. | Prefer where regulatory requirements mandate >3.75 kVRMS working voltage and 150 Mbps is unnecessary. |
Compared with ADUM141DARZ and ISO6751QDR, SI8451AB-B-IS1 uniquely balances five-channel count, 150 Mbps speed, sub-10 ns timing, and 2.5 kVRMS certification in a standard SOIC-16 - making it optimal for space-constrained, high-performance industrial and automotive isolation where both channel density and speed matter.
Availability
SI8451AB-B-IS1 is available at Aetrix Electronics and suitable for industrial motor control, hybrid electric vehicle power inverters, isolated ADC/DAC interfaces, and programmable logic controller I/O modules requiring stable component supply and long-lifecycle support.
Supply support for SI8451AB-B-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 for wireless, automotive, and industrial markets.
The Si84xx family was designed specifically for high-reliability, high-speed digital isolation in harsh environments - targeting applications demanding low power, precise timing, and certified safety compliance beyond legacy optocoupler performance.
FAQ
What is the maximum operating temperature for SI8451AB-B-IS1 at full 150 Mbps data rate?
The SI8451AB-B-IS1 supports continuous operation at –40 °C to +125 °C ambient temperature while maintaining 150 Mbps data rate, 15 pF load, and 5 V supply - verified per Table 1 in the datasheet. Thermal derating begins above 125 °C case temperature per DIN EN 60747-5-2 compliance requirements.
Does SI8451AB-B-IS1 require external bypass capacitors beyond the recommended VDD decoupling?
Yes - SI8451AB-B-IS1 requires 0.1 µF ceramic bypass capacitors placed as close as possible to each VDD pin (pins 7 and 15) and connected directly to their respective GND pins (pins 8 and 16). No additional RC networks or series termination resistors are needed due to its integrated 85 Ω output impedance.
How does the enable function operate on SI8451AB-B-IS1?
SI8451AB-B-IS1 has two independent enable inputs: EN1 (pin 5) controls side 1 outputs, and EN2 (pin 13) controls side 2 outputs. When asserted high, outputs drive normally; when low, corresponding outputs enter high-impedance state within 7.0–9.2 ns. Both enables default to active-high logic.
Is SI8451AB-B-IS1 pin-compatible with other members of the Si845x family?
Yes - SI8451AB-B-IS1 shares identical pinout and package with Si8450/52/55 variants in the NB SOIC-16 footprint. Channel count and speed grade differ (e.g., Si8450B = 1-channel, Si8452B = 6-channel), but pin assignments for VDD, GND, EN, and I/O are fully compatible across the family.
What safety certifications apply specifically to SI8451AB-B-IS1?
SI8451AB-B-IS1 carries UL 1577 (2500 VRMS, File E257455), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (560 VPEAK, File 5006301-4880-0001) - all confirmed for the NB SOIC-16 package variant and applicable to SI8451AB-B-IS1 per Skyworks Rev. 1.6 datasheet Section 6 and Table 6.
SI8451AB-B-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:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 25kV/µs (Typ)
- Data Rate:
- 1Mbps
- Propagation Delay tpLH / tpHL (Max):
- 35ns, 35ns
- Pulse Width Distortion (Max):
- 25ns
- 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
SI8451AB-B-IS1 FAQ
1.How can I place an order for SI8451AB-B-IS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8451AB-B-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 SI8451AB-B-IS1 reliable?
The price and inventory of SI8451AB-B-IS1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8451AB-B-IS1 is usually 5 days.
3.What payment methods are accepted for SI8451AB-B-IS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8451AB-B-IS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8451AB-B-IS1?
SI8451AB-B-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8451AB-B-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 SI8451AB-B-IS1?
For technical support, including SI8451AB-B-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8451AB-B-IS1 requirements.
6.How does Aetrix verify that SI8451AB-B-IS1 is sourced from the original manufacturer or authorized distributors?
All SI8451AB-B-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 SI8451AB-B-IS1 meets industry standards.
7.What is the process for return or replacement of SI8451AB-B-IS1?
All SI8451AB-B-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8451AB-B-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 SI8451AB-B-IS1 part is unused and in its original packaging.
Return procedure for SI8451AB-B-IS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8451AB-B-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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