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Skyworks Solutions Inc. SI8451AA-A-IS1
- Part No.:
- SI8451AA-A-IS1
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8451AA-A-IS1.pdf
- Description:
- DGTL ISO 1000VRMS 5CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,864
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Product details
Overview
SI8451AA-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, 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 SI8451AA-A-IS1 datasheet, SI8451AA-A-IS1 pinout, SI8451AA-A-IS1 application, or SI8451AA-A-IS1 equivalent, this page provides verified electrical specs, safety certifications (UL 1577, CSA 5A, VDE 0884-2), thermal derating data, and real-world design context for industrial automation and hybrid electric vehicle systems.
Technical Context
The SI8451AA-A-IS1 implements capacitive isolation with on-chip RF modulation/demodulation, eliminating start-up initialization and enabling immediate data transmission after power-on. Its dual-supply architecture (VDD1/VDD2) supports asymmetric voltage operation (e.g., 3.3 V on side 1, 5 V on side 2) while maintaining precise timing across –40 to +125 °C.
Each of its five isolated channels features independent enable control, 85 Ω nominal output impedance for controlled-impedance PCB routing, and integrated ESD protection (±10 µA input leakage). The device achieves reinforced insulation rated to 2500 VRMS and meets IEC 60747-5-2 for 560 Vpeak working voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Data Rate | 150 Mbps - supports high-speed serial links (e.g., SPI, RS-485 transceiver isolation) without signal degradation |
| Propagation Delay | 3.0–9.5 ns - enables sub-10 ns timing-critical applications such as gate driver feedback loops |
| Channel-Channel Skew | 0.5 ns typical - ensures synchronized multi-channel sampling in isolated ADC/DAC systems |
| Common-Mode Transient Immunity | 25 kV/µs - maintains signal integrity in noisy motor drive and inverter environments |
| Supply Voltage Range | 2.70–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends |
| Isolation Withstand Voltage | 2500 VRMS (1 min) - certified for reinforced insulation per UL, CSA, and VDE standards |
| Operating Temperature | –40 to +125 °C - qualified for under-hood automotive and industrial ambient conditions |
Pinout & Package
SI8451AA-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 body size, and 4.9 mm minimum creepage/clearance. Pin 1 is marked with a dot; pins 1–8 form the primary side (VDD1 domain), pins 9–16 the secondary side (VDD2 domain).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Primary-side supply | Power for input-side logic and isolation transmitter; accepts 2.70–5.5 V |
| GND1 | Primary-side ground | Reference return for VDD1 domain; must be separated from GND2 by isolation barrier |
| IN1–IN5 | Input signals (primary side) | CMOS-compatible inputs accepting VIH ≥2.0 V, VIL ≤0.8 V; no external pull-ups required |
| EN1–EN5 | Per-channel enable inputs | Active-high control: drives corresponding OUTx low when disabled; 2.0 µA max input current |
| VDD2 | Secondary-side supply | Power for output-side logic and isolation receiver; independent of VDD1 |
| GND2 | Secondary-side ground | Reference return for VDD2 domain; galvanically isolated from GND1 |
| OUT1–OUT5 | Isolated output signals | CMOS outputs with VOH ≥VDD2–0.4 V, VOL ≤0.4 V; 85 Ω series termination integrated |
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 isolators |
| No start-up initialization | Valid data within 40 µs of power application - eliminates boot-time delays in safety-critical power systems |
| Precision timing | 1.5 ns pulse width distortion and 2 ns propagation delay skew - preserves signal integrity in high-resolution encoder interfaces |
| Robust EMC performance | 25 kV/µs CMTI and ±10 µA input leakage - sustains operation during fast-switching transients in SiC/GaN inverters |
| Safety-certified isolation | UL 1577 (2500 VRMS), CSA 5A, VDE 0884-2 - enables single-component compliance for IEC 61800-5-1 and ISO 26262 ASIL-B systems |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in 3-phase inverter stacks. IC Role / Device Role / Timing Role: Five-channel isolator transmitting gate commands (IN1–IN3) and sensing data (IN4–IN5) across high dv/dt barriers. Use Value: 0.5 ns channel skew ensures simultaneous MOSFET switching; 25 kV/µs CMTI prevents false triggering during 100 V/ns transients. |
Use Scenario: Connecting delta-sigma modulators to MCU ADCs in isolated current/voltage measurement circuits. IC Role / Device Role / Timing Role: Transmitting oversampled bitstreams across isolation barrier while preserving timing coherence. Use Value: 150 Mbps data rate supports 20-bit resolution at 20 kSPS; <9.5 ns propagation delay minimizes latency in closed-loop control. |
| Hybrid Electric Vehicle Battery Management | Isolated Switch-Mode Power Supply |
Use Scenario: Level-shifting cell voltage monitoring signals from high-voltage battery packs to low-voltage BMS controllers. IC Role / Device Role / Timing Role: Five independent channels isolating individual cell measurements and pack-level status flags. Use Value: –40 to +125 °C operation covers under-hood thermal range; 2500 VRMS rating meets automotive functional safety requirements. |
Use Scenario: Isolating feedback signals (voltage, current, temperature) from secondary side to primary-side PWM controller. IC Role / Device Role / Timing Role: Transmitting error amplifier output and overcurrent alerts across transformerless flyback or LLC topologies. Use Value: 85 Ω output impedance simplifies PCB trace matching; <10 ns delay enables fast loop response in <1 MHz SMPS designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM1510ARZ | Five-channel, 1 Mbps max data rate; 25 ns propagation delay; 2.5 kVRMS isolation | Targeted at low-speed control signaling (e.g., I²C, GPIO), not high-speed serial links | Choose ADUM1510ARZ only if system data rate ≤1 Mbps and timing skew tolerance >10 ns |
| ISO6751QDWR | Five-channel, 50 Mbps max data rate; 11 ns propagation delay; 5 kVRMS isolation | Higher isolation rating but lower speed; optimized for industrial PLC backplanes with long trace runs | Choose ISO6751QDWR when 5 kVRMS working voltage is mandatory and 150 Mbps is unnecessary |
Compared with ADUM1510ARZ and ISO6751QDWR, SI8451AA-A-IS1 uniquely balances 150 Mbps speed, sub-10 ns timing, and 2500 VRMS certification-making it optimal for next-generation motor drives and HEV battery monitors where bandwidth and precision coexist.
Availability
SI8451AA-A-IS1 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 and long-term lifecycle support.
Supply support for SI8451AA-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, high-speed digital isolation in harsh environments-targeting industrial automation, automotive electrification, and energy infrastructure applications.
FAQ
What is the maximum operating temperature for SI8451AA-A-IS1?
The SI8451AA-A-IS1 is rated for continuous operation from –40 to +125 °C ambient temperature at full 150 Mbps data rate and 5 V supply. Thermal derating begins above 125 °C case temperature per DIN EN 60747-5-2, with safety limiting values dropping linearly to zero at 150 °C. This specification is validated across all five channels simultaneously.
Does SI8451AA-A-IS1 require external bypass capacitors?
Yes - SI8451AA-A-IS1 requires 0.1 µF ceramic bypass capacitors placed as close as possible to each VDD1 and VDD2 pin relative to its respective GND1 and GND2. The datasheet specifies these are the only external components needed beyond PCB layout best practices; no pull-up/down resistors or series terminations are required due to integrated 85 Ω drivers and CMOS-compatible thresholds.
How does the enable function work on SI8451AA-A-IS1?
Each of the five channels on SI8451AA-A-IS1 has a dedicated active-high enable input (EN1–EN5). When an ENx pin is driven low, the corresponding OUTx pin enters high-impedance state within 9.2 ns (ten2); when ENx goes high, valid data appears at OUTx within 8.0 ns (ten1). This per-channel control enables dynamic power gating and signal routing without affecting other isolated paths.
Is SI8451AA-A-IS1 pin-compatible with other Si84xx variants?
No - SI8451AA-A-IS1 is not pin-compatible with Si8450 or Si8452 variants. While all share the same SOIC-16 NB package and pin count, the internal channel mapping differs: SI8451AA-A-IS1 configures IN1–IN5 and OUT1–OUT5 as five unidirectional channels, whereas Si8450 offers four unidirectional + one bidirectional channel. Pin assignments for ENx and direction control vary across the family.
What safety certifications apply to SI8451AA-A-IS1?
SI8451AA-A-IS1 carries UL 1577 recognition (2500 VRMS, 1 min), CSA Component Acceptance Notice 5A (IEC 60950-1/61010-1), and VDE certification to IEC 60747-5-2 (reinforced insulation, 560 Vpeak working voltage). All certifications apply to the NB SOIC-16 package variant and were verified via production testing at 3000 VRMS for 1 second.
SI8451AA-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:
- 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
SI8451AA-A-IS1 FAQ
1.How can I place an order for SI8451AA-A-IS1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8451AA-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 SI8451AA-A-IS1 reliable?
The price and inventory of SI8451AA-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 SI8451AA-A-IS1 is usually 5 days.
3.What payment methods are accepted for SI8451AA-A-IS1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8451AA-A-IS1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8451AA-A-IS1?
SI8451AA-A-IS1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8451AA-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 SI8451AA-A-IS1?
For technical support, including SI8451AA-A-IS1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8451AA-A-IS1 requirements.
6.How does Aetrix verify that SI8451AA-A-IS1 is sourced from the original manufacturer or authorized distributors?
All SI8451AA-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 SI8451AA-A-IS1 meets industry standards.
7.What is the process for return or replacement of SI8451AA-A-IS1?
All SI8451AA-A-IS1 units undergo pre-shipment inspection (PSI). If there is an issue with SI8451AA-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 SI8451AA-A-IS1 part is unused and in its original packaging.
Return procedure for SI8451AA-A-IS1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8451AA-A-IS1 Tags
-
ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
-
ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
-
SI8710CC-B-ISR
Skyworks Solutions Inc.
-
ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
-
ISO7741DWR
Texas Instruments
-
ISO7741FDWR
Texas Instruments
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