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Skyworks Solutions Inc. SI8455BB-B-ISR
- Part No.:
- SI8455BB-B-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8455BB-B-ISR.pdf
- Description:
- IC DGTL ISO 2.5KV GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,917
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Product details
Overview
SI8455BB-B-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 and 25 kV/µs common-mode transient immunity. It operates across 2.70–5.5 V supply rails and delivers <6 mA per channel at 100 Mbps (5 V), enabling high-speed isolation in motor control and isolated ADC interfaces.
For engineers reviewing the SI8455BB-B-ISR datasheet, SI8455BB-B-ISR pinout, SI8455BB-B-ISR application, or SI8455BB-B-ISR equivalent, this page provides verified timing specs, safety certifications (UL, CSA, VDE), channel-channel skew (≤1.8 ns), and precise enable-to-data timing (5–8 ns) critical for real-time industrial and automotive signal integrity.
Technical Context
The SI8455BB-B-ISR implements RF-based on/off keying modulation across its five isolated channels, eliminating start-up initialization and ensuring deterministic behavior across –40 to +125 °C. Its semiconductor isolation barrier enables stable propagation delay (<9.5 ns) and pulse width distortion (<2.5 ns) independent of temperature or voltage drift.
Each channel features independent enable control (ENx), supports bidirectional DC-to-150 Mbps signaling, and maintains reinforced insulation rated to 2500 VRMS with 560 VPEAK working voltage per IEC 60747-5-2. Input/output supplies (VDD1/VDD2) are fully independent and support mixed-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 150 Mbps - enables high-speed serial links (e.g., SPI, RS-485 isolators) without oversampling or clock recovery circuitry. |
| Propagation Delay | 3.0–9.5 ns (typ/max) - ensures sub-10 ns timing predictability for time-critical feedback loops in motor drives and power inverters. |
| Channel-Channel Skew | ≤1.8 ns (max) - guarantees synchronized sampling across multiple isolated analog inputs (e.g., multi-phase current sensing). |
| CMTI | 25 kV/µs - suppresses noise coupling in high-dV/dt environments like IGBT gate drivers and isolated SMPS. |
| Supply Range | 2.70–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V peripherals without level shifters. |
| Isolation Rating | 2500 VRMS (1 min) - certified to UL 1577, CSA Component Notice 5A, and VDE IEC 60747-5-2 for reinforced insulation. |
| Power @ 100 Mbps | <6 mA per channel (5 V) - reduces thermal load and enables compact, fanless designs in space-constrained industrial modules. |
Pinout & Package
SI8455BB-B-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 ≥4.01 mm / 4.9 mm and internal isolation barrier separating pins 1–8 (input side) from pins 9–16 (output side).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 8 | Input Channels A1–A4, VDD1 | Pins 1–4 accept isolated logic inputs; Pin 8 is input-side VDD1 - decoupling capacitor required per datasheet Section 2.4. |
| 5, 7 | Enable Inputs EN1, EN2 | Active-high enables for Channel Groups 1–2 (EN1) and 3–4 (EN2); EN2 not present on Si8450 - specific to Si8455B variant. |
| 6, 9 | GND1, GND2 | Separate ground references for input and output domains - mandatory for maintaining isolation integrity and CMTI performance. |
| 10–13 | Output Channels B1–B4 | Isolated logic outputs corresponding to A1–A4; driven low or Hi-Z depending on EN state per Table 12 (Revision B). |
| 14–16 | VDD2, EN3, B5 | Pin 14 = output-side VDD2; Pin 15 = EN3 for Channel 5; Pin 16 = fifth isolated output B5 - confirms 5-channel topology. |
Key Features
| Feature | Design Value |
|---|---|
| RF modulation architecture | Eliminates startup initialization and enables immediate data transmission upon power application - no handshake or calibration needed. |
| Independent dual-supply operation | VDD1 and VDD2 support different voltages (e.g., 3.3 V MCU side / 5 V sensor side), removing need for external level translators. |
| Enable-controlled channel groups | Three enable inputs (EN1, EN2, EN3) allow selective shutdown of channel subsets - reduces dynamic power by >50% during idle periods. |
| Sub-10 ns timing precision | Worst-case propagation delay ≤9.5 ns and channel skew ≤1.8 ns - meets timing budgets for closed-loop control in servo drives and UPS systems. |
| 60-year lifetime at rated voltage | Validated per IEC 60747-5-2 - ensures long-term reliability in infrastructure equipment with 15+ year service life requirements. |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
|
Use Scenario: Real-time current/voltage sensing in three-phase inverter legs with gate driver feedback. IC Role / Device Role / Timing Role: Isolates PWM feedback signals and analog front-end digitization clocks between high-voltage power stage and low-voltage controller. Use Value: 1.8 ns channel skew preserves phase alignment across multi-channel current measurements; 25 kV/µs CMTI prevents false triggering during IGBT switching transients. |
Use Scenario: Digitizing analog sensor outputs (e.g., temperature, pressure) in high-noise factory-floor PLC modules. IC Role / Device Role / Timing Role: Provides galvanic isolation between 24 V field-side sensors and 3.3 V ADC/MCU domain while preserving signal integrity. Use Value: 150 Mbps capability supports oversampled sigma-delta ADC streams; 2.7–5.5 V dual supply eliminates level-shifter components. |
| Hybrid Electric Vehicle Battery Management | Isolated Switch-Mode Power Supply |
|
Use Scenario: Cell voltage monitoring and balancing control across 96-cell battery packs with >400 V bus potential. IC Role / Device Role / Timing Role: Isolates high-side cell monitor ICs (e.g., LTC68xx) from central BMS MCU via daisy-chained SPI. Use Value: 2500 VRMS rating meets automotive reinforced insulation requirements; 125 °C ambient operation supports under-hood placement. |
Use Scenario: Feedback loop isolation in 1–3 kW telecom rectifiers and server PSUs using LLC or phase-shifted full-bridge topologies. IC Role / Device Role / Timing Role: Transfers error amplifier output and synchronous rectifier timing signals across primary-secondary boundary. Use Value: <9.5 ns propagation delay minimizes control loop latency; 5-channel count consolidates multiple optocouplers into single SOIC footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital isolator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADUM141DBRZ | Four-channel, 150 Mbps, 2.5 kVRMS, SOIC-16; lacks dedicated EN3 pin and fifth channel. | Suitable for 4-channel-only systems; requires external logic for 5-signal isolation. | Select when exact 4-channel count suffices and ADI ecosystem integration is preferred. |
| ISO6741QDR | Four-channel, 50 Mbps, 5000 VRMS, SOIC-16; lower speed but higher isolation rating and integrated LDO. | Better suited for ultra-high-isolation safety-critical subsystems where bandwidth ≤50 Mbps is acceptable. | Choose for medical or high-voltage grid-tie inverters requiring >3.75 kVRMS working voltage. |
Compared with ADUM141DBRZ and ISO6741QDR, SI8455BB-B-ISR uniquely delivers five isolated channels at 150 Mbps in a standard SOIC-16, enabling consolidation of discrete isolators while maintaining sub-10 ns timing - critical for multi-axis motion control and high-fidelity isolated data acquisition.
Availability
SI8455BB-B-ISR 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-lifecycle support, and certified 2500 VRMS isolation.
Supply support for SI8455BB-B-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 Si845x family was designed specifically for high-reliability, low-power digital isolation in harsh electromagnetic environments - targeting applications demanding precise timing, long operational life, and regulatory compliance without optical degradation.
FAQ
What is the maximum data rate supported by SI8455BB-B-ISR?
The SI8455BB-B-ISR supports a maximum data rate of 150 Mbps, validated across its full operating temperature range (–40 to +125 °C) and supply voltage range (2.70–5.5 V). This rating applies to all five channels simultaneously and is specified in Tables 3–5 of the Rev. 1.6 datasheet under Si845xBx timing characteristics.
Does SI8455BB-B-ISR require external start-up initialization?
No, SI8455BB-B-ISR does not require external start-up initialization. Its RF-based modulation architecture enables immediate data transmission upon power application, with start-up time specified as 15–40 µs - the interval from VDD application to valid output data, as confirmed in Table 3 footnote 4 and Section 2.3.
What safety certifications apply to SI8455BB-B-ISR?
SI8455BB-B-ISR holds UL 1577 recognition (2500 VRMS, 1 min), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 certification. These cover reinforced insulation with 560 VPEAK working voltage and are explicitly listed in Tables 6 and 9 of the Rev. 1.6 datasheet.
How many enable inputs does SI8455BB-B-ISR have, and what do they control?
SI8455BB-B-ISR has three enable inputs: EN1 (Pin 5), EN2 (Pin 7), and EN3 (Pin 15). EN1 controls Channels 1–2, EN2 controls Channels 3–4, and EN3 controls Channel 5 - enabling granular power gating per channel group, as defined in Table 12 and Section 2.3 of the datasheet.
What is the channel-to-channel skew specification for SI8455BB-B-ISR?
The channel-to-channel skew for SI8455BB-B-ISR is specified as ≤1.8 ns (maximum) at 150 Mbps, 5 V supply, and –40 to +125 °C ambient temperature. This value is documented in Table 3 (Si845xBx timing characteristics) and reflects worst-case variation between any two output channels under identical operating conditions.
SI8455BB-B-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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:
- 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-B-ISR FAQ
1.How can I place an order for SI8455BB-B-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8455BB-B-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-B-ISR reliable?
The price and inventory of SI8455BB-B-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-B-ISR is usually 5 days.
3.What payment methods are accepted for SI8455BB-B-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8455BB-B-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8455BB-B-ISR?
SI8455BB-B-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8455BB-B-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-B-ISR?
For technical support, including SI8455BB-B-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8455BB-B-ISR requirements.
6.How does Aetrix verify that SI8455BB-B-ISR is sourced from the original manufacturer or authorized distributors?
All SI8455BB-B-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-B-ISR meets industry standards.
7.What is the process for return or replacement of SI8455BB-B-ISR?
All SI8455BB-B-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8455BB-B-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-B-ISR part is unused and in its original packaging.
Return procedure for SI8455BB-B-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8455BB-B-ISR 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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