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Skyworks Solutions Inc. SI8455BA-B-IU
- Part No.:
- SI8455BA-B-IU
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
SI8455BA-B-IU.pdf
- Description:
- DGTL ISO 1000VRMS 5CH GP 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,505
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Product details
Overview
SI8455BA-B-IU from Skyworks Solutions is a five-channel CMOS digital isolator with semiconductor-based isolation barrier, supporting up to 150 Mbps data rate, <9.5 ns worst-case propagation delay, and 0.5 ns typical channel-to-channel skew in a 16-pin QSOP package. It operates across 2.70–5.5 V supply rails on both sides and delivers ultra-low power consumption-under 6 mA per channel at 100 Mbps under 5 V.
For engineers reviewing the SI8455BA-B-IU datasheet, SI8455BA-B-IU pinout, SI8455BA-B-IU application, or SI8455BA-B-IU equivalent, this page provides verified electrical specs, safety certifications (UL 1577, VDE IEC 60747-5-2, CSA 5A), timing performance at 150 Mbps, and real-world isolation use cases in motor control and isolated ADC interfaces.
Technical Context
The SI8455BA-B-IU implements RF-based on/off keying modulation across its five independent isolation channels, eliminating start-up initialization and enabling immediate data transmission upon power application. Each channel features bidirectional signal transfer capability, with separate input and output supply domains (VDD1/VDD2) supporting asymmetric voltage operation.
Its semiconductor isolation barrier achieves 1000 VRMS withstand voltage and 25 kV/µs common-mode transient immunity (CMTI), while maintaining stable timing parameters-including 1.5 ns pulse width distortion and 2 ns propagation delay skew-across –40 °C to +125 °C ambient temperature at full 150 Mbps data rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 5 independent unidirectional isolation channels |
| Max Data Rate | 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceiver control, and real-time encoder feedback |
| Propagation Delay | 3.0–9.5 ns - enables sub-10 ns timing-critical sampling in isolated gate drivers and ADC synchronization |
| Channel-Channel Skew | 0.5 ns typical - ensures precise multi-signal alignment for phase-sensitive motor control PWM signals |
| Supply Voltage Range | 2.70–5.5 V per side - allows interoperability with 3.3 V microcontrollers and 5 V analog subsystems without level shifters |
| Isolation Rating | 1000 VRMS for 1 minute - certified to UL 1577, VDE IEC 60747-5-2, and CSA Component Notice 5A |
| CMTI | 25 kV/µs - sustains reliable operation in noisy industrial environments with fast-switching power devices |
Pinout & Package
SI8455BA-B-IU is housed in a RoHS-compliant 16-pin QSOP package (5.3 mm × 10.2 mm, 1.0 mm height) with 0.635 mm pitch. Pin assignments follow Skyworks' standard Si845x pinout for five-channel isolators.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side supply | Power domain for channels 1–5 inputs; accepts 2.70–5.5 V; requires local 0.1 µF bypass capacitor |
| GND1 | Input-side ground | Reference return for VDD1 and all input signals; must be separated from GND2 by isolation barrier |
| IN1–IN5 | Input signal terminals | CMOS-compatible logic inputs referenced to GND1; VIH ≥ 2.0 V, VIL ≤ 0.8 V |
| VDD2 | Output-side supply | Independent power domain for outputs; supports different voltage than VDD1 (e.g., 3.3 V MCU + 5 V actuator) |
| GND2 | Output-side ground | Reference return for VDD2 and all output signals; galvanically isolated from GND1 |
| OUT1–OUT5 | Output signal terminals | Push-pull CMOS outputs referenced to GND2; VOH ≥ VDD2 – 0.4 V, VOL ≤ 0.4 V @ 4 mA load |
| EN | Enable control input | Active-high enable on output side; drives outputs to high-impedance state when low (EN = 0) |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation architecture | Eliminates optical degradation and startup delays; enables immediate data transmission after power-on |
| Ultra-low power at 100 Mbps | <6 mA per channel at 5 V - reduces thermal load in dense PCB layouts and extends battery life in portable isolated systems |
| High CMTI (25 kV/µs) | Prevents false triggering in motor drives and inverters exposed to rapid dv/dt transients from SiC/GaN switches |
| QSOP-16 footprint | Industry-standard 16-pin package compatible with existing pick-and-place and reflow processes; no redesign needed |
| Wide temperature range | –40 °C to +125 °C operation at full 150 Mbps - suitable for under-hood automotive and industrial control cabinets |
Applications
| Industrial Motor Control | Isolated ADC Interface |
|---|---|
|
Use Scenario: Isolating PWM gate drive signals and current-sense feedback in three-phase inverter stacks using SiC MOSFETs. IC Role / Device Role / Timing Role: Five-channel isolator transmitting synchronized PWM signals (CH1–CH3) and two analog feedback paths (CH4–CH5) across isolation barrier. Use Value: 0.5 ns channel-to-channel skew preserves phase alignment between leg drivers; 25 kV/µs CMTI prevents misfiring during fast switching transitions. |
Use Scenario: Connecting a precision 16-bit sigma-delta ADC (e.g., AD7768) to an isolated host MCU in energy metering. IC Role / Device Role / Timing Role: Transmitting serial clock (SCLK), data (DOUT), and frame sync (DRDY) signals across isolation boundary while maintaining timing integrity. Use Value: 9.5 ns max propagation delay ensures setup/hold timing margins for 10 MHz SCLK; 2.7–5.5 V dual-supply flexibility matches ADC's 3.3 V IO and MCU's 5 V logic. |
| Isolated Switch-Mode Power Supply | Communications System Isolation |
|
Use Scenario: Providing feedback isolation for secondary-side regulation in 1 kW LLC resonant converters with synchronous rectification. IC Role / Device Role / Timing Role: Isolating error amplifier output, synchronous FET gate signals, and fault reporting lines between primary and secondary control domains. Use Value: 150 Mbps capability supports high-frequency telemetry links; 1000 VRMS rating meets reinforced insulation requirements for >400 V DC bus applications. |
Use Scenario: Galvanic isolation of RS-485 transceiver control lines (DE/RE) and data lines in factory automation networks. IC Role / Device Role / Timing Role: Five-channel isolation of TX, RX, DE, RE, and fault indicator signals to prevent ground loop noise and surge propagation. Use Value: Independent VDD1/VDD2 supplies allow RS-485 transceiver (5 V) and controller (3.3 V) to operate at native voltages; QSOP-16 simplifies board layout vs. discrete optocouplers. |
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, SOIC-16; higher 12 ns max propagation delay; 1000 VRMS rating | Lacks fifth channel; requires external logic for 5-signal isolation; lower CMTI (100 kV/µs) | Use when only four signals need isolation and higher CMTI is not required; verify timing margins due to longer delay. |
| ISO6751QDWR | 5-channel, 50 Mbps, SOIC-16; 5000 VRMS rating; 2.25–5.5 V supply; 11 ns max propagation delay | Lower data rate limits use in high-speed SPI or encoder interfaces; higher isolation voltage suits medical mains-connected systems | Select for cost-sensitive designs where 50 Mbps suffices and enhanced 5 kVRMS isolation is mandated by end-equipment safety standards. |
Compared with ADUM141DARZ and ISO6751QDWR, SI8455BA-B-IU uniquely delivers five 150 Mbps channels in QSOP-16 with 0.5 ns skew and 25 kV/µs CMTI-making it optimal for tightly timed multi-signal isolation in motor drives and high-resolution data acquisition, where channel count, speed, and noise immunity are jointly critical.
Availability
SI8455BA-B-IU is available at Aetrix Electronics and suitable for industrial motor control, isolated ADC interfaces, and communications system isolation requiring stable component supply and long-term design continuity.
Supply support for SI8455BA-B-IU 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 engineered to replace optocouplers in high-reliability industrial and automotive systems, delivering superior speed, power efficiency, and lifetime stability through RF-based CMOS isolation.
FAQ
What is the maximum data rate supported by SI8455BA-B-IU?
The SI8455BA-B-IU supports a maximum data rate of 150 Mbps across all five channels, verified under worst-case conditions (–40 °C to +125 °C, 5 V supply, 15 pF load). This enables use in high-speed serial protocols including SPI clocked above 30 MHz and real-time encoder interfaces requiring sub-10 ns timing resolution.
Does SI8455BA-B-IU require external components for basic operation?
No, SI8455BA-B-IU requires only VDD bypass capacitors (0.1 µF ceramic per supply rail) for stable operation. It has no start-up initialization sequence, no external oscillator, and no configuration registers-enabling immediate data transmission upon power application, unlike some programmable isolators.
What safety certifications apply to SI8455BA-B-IU?
SI8455BA-B-IU is certified to UL 1577 (1000 VRMS, 1 min), VDE IEC 60747-5-2 (560 Vpeak working voltage), and CSA Component Notice 5A. These certifications cover the QSOP-16 package and are production-tested to 1200 VRMS for 1 second, ensuring compliance in industrial and medical equipment.
How does the enable (EN) pin function on SI8455BA-B-IU?
The EN pin is an active-high control input on the output side (VDD2 domain). When EN = low, all five outputs enter high-impedance state within 9.2 ns; when EN = high or floating (NC), outputs actively drive according to input states. This allows dynamic isolation control in power sequencing and fault-handling circuits.
Can SI8455BA-B-IU operate with different supply voltages on input and output sides?
Yes, SI8455BA-B-IU supports independent VDD1 (input side) and VDD2 (output side) supplies ranging from 2.70 V to 5.5 V each. This enables direct interfacing between 3.3 V microcontrollers and 5 V analog subsystems-eliminating level shifters in isolated sensor or actuator interfaces.
SI8455BA-B-IU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (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:
- 5/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 1000Vrms
- 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-QSOP
SI8455BA-B-IU FAQ
1.How can I place an order for SI8455BA-B-IU through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8455BA-B-IU 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 SI8455BA-B-IU reliable?
The price and inventory of SI8455BA-B-IU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8455BA-B-IU is usually 5 days.
3.What payment methods are accepted for SI8455BA-B-IU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8455BA-B-IU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8455BA-B-IU?
SI8455BA-B-IU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8455BA-B-IU 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 SI8455BA-B-IU?
For technical support, including SI8455BA-B-IU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8455BA-B-IU requirements.
6.How does Aetrix verify that SI8455BA-B-IU is sourced from the original manufacturer or authorized distributors?
All SI8455BA-B-IU 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 SI8455BA-B-IU meets industry standards.
7.What is the process for return or replacement of SI8455BA-B-IU?
All SI8455BA-B-IU units undergo pre-shipment inspection (PSI). If there is an issue with SI8455BA-B-IU, 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 SI8455BA-B-IU part is unused and in its original packaging.
Return procedure for SI8455BA-B-IU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8455BA-B-IU 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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