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Skyworks Solutions Inc. SI8455BB-A-ISR
- Part No.:
- SI8455BB-A-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SI8455BB-A-ISR.pdf
- Description:
- IC DGTL ISO 2.5KV GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
SI8455BB-A-ISR from Silicon Labs 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, 25 kV/µs CMTI, and 2.5 kVRMS isolation voltage. It operates across 2.7–5.5 V supply rails and is used in isolated ADC interfaces, motor control gate drivers, and industrial PLC I/O modules.
For engineers reviewing the SI8455BB-A-ISR datasheet, SI8455BB-A-ISR pinout, SI8455BB-A-ISR application, or SI8455BB-A-ISR equivalent, this page delivers verified timing specs, channel configuration, safety certifications (UL, CSA, VDE), and real-world design implications for high-noise industrial and automotive subsystems.
Technical Context
The SI8455BB-A-ISR implements RF-based on/off keying modulation across its five isolated channels, eliminating start-up initialization and enabling immediate data transmission after power-on. Its semiconductor isolation barrier provides stable performance from –40 °C to +125 °C at full 150 Mbps data rate under 15 pF load.
Each channel features independent enable control (ENx) on the output side, supporting tri-state output behavior with 5–8 ns enable-to-data-valid latency. The device uses internal 85 Ω ±40% output impedance matching for controlled-impedance PCB trace termination in high-speed layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 150 Mbps - supports high-resolution encoder feedback and fast SPI communication in motor drives. |
| Propagation Delay | 3.0–9.5 ns - enables sub-10 ns timing-critical signal isolation in gate driver circuits. |
| CMTI | 25 kV/µs - maintains signal integrity during fast-switching transients in SiC/GaN inverter stages. |
| Isolation Voltage | 2500 VRMS - certified for reinforced insulation per UL 1577, CSA 5A, and VDE 0884-2. |
| Supply Range | 2.70–5.5 V on both sides - allows interoperability with 3.3 V microcontrollers and 5 V analog front-ends. |
| Channel Count | 5 unidirectional channels - configured as 3 forward + 2 reverse or other combinations per pinout mapping. |
| Power @ 100 Mbps | <30 mA total (VDD1+VDD2) at 5 V - reduces thermal load in dense I/O modules. |
Pinout & Package
SI8455BB-A-ISR 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 60-year lifetime at rated working voltage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5 | Input Channels A1–A5 | Logic-level inputs referenced to VDD1; accept 2.0 V min VIH and 0.8 V max VIL. |
| 6, 7, 8 | VDD1, GND1, EN1 | VDD1 powers input-side circuitry; EN1 is NC (no connect) per Si8455-specific pinout. |
| 9, 10, 11, 12, 13 | Output Channels B1–B5 | CMOS outputs referenced to VDD2; drive 4 mA sink/source with 0.2–0.4 V VOL. |
| 14, 15, 16 | VDD2, GND2, EN2 | VDD2 powers output-side logic; EN2 controls B2 output tri-state (active-low). |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates optical degradation and startup delays-enables deterministic operation from first clock edge. |
| Channel-channel skew | ≤1.8 ns - ensures synchronized sampling across multi-channel isolated ADC interfaces. |
| Pulse width distortion | ≤2.5 ns - preserves duty cycle fidelity in PWM feedback loops for servo control. |
| Enable-controlled tri-state | EN2 asserts B2 into high-impedance within 9.2 ns-supports bus sharing in isolated SPI daisy chains. |
| Low EMI emissions | Meets CISPR 22 Class B without external filtering-reduces layout complexity in EMC-sensitive applications. |
Applications
| Isolated ADC Interface | Motor Gate Driver Isolation |
|---|---|
Use Scenario: Isolating serial interface between MCU and precision 24-bit sigma-delta ADC in industrial weigh scales. IC Role / Device Role / Timing Role: Five-channel isolator routes SCLK, SDATA, CS, DRDY, and RESET signals across isolation barrier with matched propagation delay. Use Value: Maintains <1.8 ns inter-channel skew to prevent sampling window misalignment and quantization error. | Use Scenario: Providing independent high-side and low-side gate drive signals for three-phase IGBT inverter in HVAC compressors. IC Role / Device Role / Timing Role: Delivers isolated PWM inputs to six gate drivers using two SI8455BB-A-ISR units (3+2 channels each). Use Value: 25 kV/µs CMTI prevents false triggering during 1 kV/µs switching transients in 600 V DC-link systems. |
| PLC Digital I/O Module | Isolated CAN Transceiver Bias |
Use Scenario: Isolating 5-channel discrete input signals (24 V DC sensors) to ARM Cortex-M7 controller in modular PLC backplane. IC Role / Device Role / Timing Role: Converts 24 V sensor logic to 3.3 V MCU domain while rejecting common-mode noise on factory floor wiring. Use Value: 2.5 kVRMS isolation rating meets IEC 61000-4-5 surge immunity requirements for industrial control cabinets. | Use Scenario: Supplying isolated bias voltage and level-shifting control lines for dual-supply CAN FD transceiver in battery management system. IC Role / Device Role / Timing Role: Isolates TXD/RXD/CAN_STB signals and generates isolated 5 V bias for transceiver VIO rail via integrated LDO-compatible output. Use Value: 2.7–5.5 V dual-supply flexibility allows direct interfacing with 3.3 V MCU and 5 V CAN PHY without external regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM141DARZ | Four-channel, 150 Mbps, 2.5 kVRMS, SOIC-16; no enable pin; higher 100 Mbps current draw (32 mA vs. 30 mA) | Lacks fifth channel and EN2 control-requires additional isolator for 5-signal systems. | Select when only four signals need isolation and board space is constrained. |
| ISO6751QDR | Five-channel, 50 Mbps, 5 kVRMS, SOIC-16; lower speed; higher CMTI (85 kV/µs); 1.71–5.5 V supply | Better surge immunity but insufficient for 100+ Mbps encoder or SPI links. | Prefer for high-voltage grid-tied inverters where speed is secondary to transient robustness. |
Compared with ADUM141DARZ and ISO6751QDR, SI8455BB-A-ISR uniquely balances five-channel density, 150 Mbps speed, and integrated enable control-making it optimal for space-constrained, high-bandwidth industrial I/O where channel count and timing precision are critical.
Availability
SI8455BB-A-ISR is available at Aetrix Electronics and suitable for industrial automation systems, hybrid electric vehicle battery management, and isolated switch mode supplies requiring stable component supply across extended temperature ranges.
Supply support for SI8455BB-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
Silicon Labs is a fabless semiconductor company specializing in secure, intelligent wireless and wired connectivity solutions for IoT, industrial, and automotive markets.
The Si84xx family was designed specifically for high-reliability, low-power digital signal isolation in harsh electromagnetic environments-targeting motor control, energy infrastructure, and factory automation.
FAQ
What is the maximum data rate supported by SI8455BB-A-ISR?
The SI8455BB-A-ISR supports a maximum data rate of 150 Mbps under specified conditions (VDD = 5 V, TA = –40 to +125 °C, CL = 15 pF). This is validated across all five channels simultaneously and confirmed in Tables 3–5 of the Rev. 1.6 datasheet. SI8455BB-A-ISR achieves this while maintaining <9.5 ns worst-case propagation delay and <2.5 ns pulse width distortion-critical for high-fidelity SPI and encoder interfaces.
Does SI8455BB-A-ISR require external components for basic operation?
No, SI8455BB-A-ISR requires only VDD bypass capacitors (0.1 µF ceramic per supply rail) for stable operation-no external resistors, transformers, or initialization firmware are needed. This is enabled by its RF-based isolation architecture and internal oscillator. The SI8455BB-A-ISR datasheet explicitly states "only VDD bypass capacitors are required" in the Description section, simplifying BOM and layout for industrial designs.
How does the enable pin (EN2) function on SI8455BB-A-ISR?
EN2 is an active-low enable input located on the output side (Pin 16) that controls the B2 output channel. When EN2 = low, B2 enters high-impedance state within 9.2 ns; when EN2 = high or floating (NC), B2 follows A2 input. This behavior is specific to Revision B silicon and documented in Table 12 and Section 3.1 of the SI8455BB-A-ISR datasheet. EN1 (Pin 7) is no-connect for SI8455 devices.
What safety certifications apply to SI8455BB-A-ISR?
SI8455BB-A-ISR is certified to UL 1577 (2500 VRMS, 1 min), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (560 VPEAK working voltage). These certifications cover the NB SOIC-16 package and are production-tested to 3000 VRMS for 1 second. All ratings are explicitly listed in Tables 6 and 7 of the SI8455BB-A-ISR Rev. 1.6 datasheet.
Is SI8455BB-A-ISR recommended for new designs?
No-SI8455BB-A-ISR is marked "Not Recommended for New Designs" in the official Silicon Labs datasheet (Rev. 1.6, April 2018). This designation indicates migration to newer families (e.g., Si86xx or Si88xx) is advised for long-term supply and feature roadmap alignment. However, SI8455BB-A-ISR remains fully supported for existing production and legacy program continuity at Aetrix Electronics.
SI8455BB-A-ISR 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:
- Yes
- Number of Channels:
- 5
- Inputs - Side 1/Side 2:
- 5/0
- 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
SI8455BB-A-ISR FAQ
1.How can I place an order for SI8455BB-A-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8455BB-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 SI8455BB-A-ISR reliable?
The price and inventory of SI8455BB-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 SI8455BB-A-ISR is usually 5 days.
3.What payment methods are accepted for SI8455BB-A-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8455BB-A-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8455BB-A-ISR?
SI8455BB-A-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8455BB-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 SI8455BB-A-ISR?
For technical support, including SI8455BB-A-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8455BB-A-ISR requirements.
6.How does Aetrix verify that SI8455BB-A-ISR is sourced from the original manufacturer or authorized distributors?
All SI8455BB-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 SI8455BB-A-ISR meets industry standards.
7.What is the process for return or replacement of SI8455BB-A-ISR?
All SI8455BB-A-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8455BB-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 SI8455BB-A-ISR part is unused and in its original packaging.
Return procedure for SI8455BB-A-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8455BB-A-ISR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
Texas Instruments
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SI8710AC-B-ISR
Skyworks Solutions Inc.
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ISO7720FDR
Texas Instruments
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ISO7721DR
Texas Instruments
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ISO7721FDR
Texas Instruments
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SI8710CC-B-ISR
Skyworks Solutions Inc.
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ISO6741FQDWRQ1
Texas Instruments
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ISO7721DWVR
Texas Instruments
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ISO7762FDBQR
Texas Instruments
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ISO7741DWR
Texas Instruments
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ISO7741FDWR
Texas Instruments
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