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Skyworks Solutions Inc. SI8455BA-B-ISR
- Part No.:
- SI8455BA-B-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI8455BA-B-ISR.pdf
- Description:
- IC DGTL ISO 1KV 5CH GP 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,361
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Product details
Overview
SI8455BA-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 on both sides 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 SI8455BA-B-ISR datasheet, SI8455BA-B-ISR pinout, SI8455BA-B-ISR application, or SI8455BA-B-ISR equivalent, key selection criteria include its 2.5 kVRMS reinforced insulation rating, channel-channel skew ≤1.8 ns, 6 ns minimum pulse width, and compatibility with industrial temperature range (–40 to 125 °C) at full speed.
Technical Context
The SI8455BA-B-ISR implements RF-based on/off keying modulation across a semiconductor isolation barrier-eliminating start-up initialization and delivering stable timing performance without external components beyond VDD bypass capacitors. Its architecture provides inherent immunity to magnetic fields and eliminates LED aging concerns of optocouplers.
Each of its five channels features independent enable control (ENx pins), precise timing (1.5 ns typical pulse width distortion, 0.5 ns typical channel-channel skew), and dual-supply operation with fully independent input (VDD1) and output (VDD2) domains. Safety certification includes UL 1577 (2500 VRMS), CSA Component Notice 5A, and VDE IEC 60747-5-2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 150 Mbps - supports high-speed serial interfaces like SPI, RS-485 transceivers, and isolated gate drivers without timing bottlenecks. |
| Propagation Delay | 3.0–9.5 ns (typ/max) - enables sub-10 ns signal transfer critical for real-time motor control loop timing. |
| Isolation Voltage | 2500 VRMS (1 min) - meets reinforced insulation requirements for industrial inverters and medical power supplies. |
| Supply Range | 2.70–5.5 V on both VDD1 and VDD2 - allows interoperability with 3.3 V microcontrollers and 5 V analog subsystems. |
| Power @ 100 Mbps | <6 mA per channel at 5 V - reduces thermal load in dense PCB layouts and extends battery life in isolated sensor nodes. |
| CMTI | 25 kV/µs - prevents data corruption during fast-switching events in SiC/GaN power stages. |
| Operating Temp | –40 to 125 °C - validated for continuous operation at full 150 Mbps in under-hood automotive and factory-floor environments. |
Pinout & Package
SI8455BA-B-ISR is housed in a RoHS-compliant 16-pin narrow-body SOIC (SOIC-16 NB) package with 1.27 mm pitch, 10.3 mm × 7.5 mm footprint, and 2.35 mm max height. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1 | Input-side power supply | Supplies logic and transmitter circuitry; accepts 2.70–5.5 V; requires local 0.1 µF bypass capacitor. |
| GND1 | Input-side ground reference | Return path for VDD1 domain; must be separated from GND2 by isolation barrier. |
| IN1–IN5 | Input signal terminals | Accept CMOS/TTL logic levels; VIH ≥2.0 V, VIL ≤0.8 V; no pull-ups required. |
| VDD2 | Output-side power supply | Supplies receiver and output driver; independent of VDD1; same voltage range as VDD1. |
| GND2 | Output-side ground reference | Return path for VDD2 domain; galvanically isolated from GND1. |
| OUT1–OUT5 | Isolated output signals | CMOS-compatible outputs; VOH ≥ VDD2–0.4 V, VOL ≤0.4 V; drive capability: ±4 mA. |
| EN1–EN5 | Per-channel enable inputs | Active-high control; drives corresponding OUTx low (Rev A) or Hi-Z (Rev B) when disabled; tied high for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based isolation barrier | Eliminates LED degradation and start-up delays-enables immediate data transfer after power-on with no configuration. |
| Ultra-low power at high speed | Consumes <6 mA per channel at 100 Mbps and 5 V-reduces heat generation in multi-isolator systems. |
| Precision timing performance | 0.5 ns typical channel-channel skew and 1.5 ns typical pulse width distortion-supports deterministic sampling in high-resolution encoder interfaces. |
| Reinforced safety certification | UL 1577, CSA 5A, and VDE IEC 60747-5-2 certified for 2500 VRMS-meets IEC 61800-5-1 for drive systems and IEC 62368-1 for power supplies. |
| High CMTI immunity | 25 kV/µs common-mode transient rejection-ensures reliable operation in noisy motor drive and inverter environments. |
Applications
| Industrial Motor Control | Isolated Switch-Mode Power Supply |
|---|---|
|
Use Scenario: Isolating PWM signals and fault feedback between MCU and gate drivers in 3-phase inverters. IC Role / Device Role / Timing Role: Five-channel isolator transmitting three phase PWMs, enable signals, and overcurrent status across isolation barrier. Use Value: Sub-10 ns propagation delay ensures tight timing alignment between phases; 25 kV/µs CMTI prevents false triggering during IGBT switching transients. |
Use Scenario: Providing isolated feedback for secondary-side regulation in AC/DC and DC/DC converters. IC Role / Device Role / Timing Role: Transmitting isolated voltage/current sense data and synchronous rectifier control signals from secondary to primary side. Use Value: 150 Mbps capability supports high-resolution ADC data streaming; 2.5 kVRMS rating satisfies reinforced insulation requirements for Class II power supplies. |
| Hybrid Electric Vehicle Battery Management | Isolated Data Acquisition Systems |
|
Use Scenario: Isolating cell voltage monitoring and balancing commands between battery pack and central controller. IC Role / Device Role / Timing Role: Five-channel isolator conveying four cell-group voltages and one balance-enable signal across 500 V+ potential difference. Use Value: –40 to 125 °C operation ensures reliability in under-hood conditions; 60-year lifetime at rated voltage guarantees long-term BMS integrity. |
Use Scenario: Interfacing isolated ADCs/DACs with host processors in test equipment and PLC analog I/O modules. IC Role / Device Role / Timing Role: Transmitting serial data (e.g., SPI clock/data) and conversion-ready strobes while maintaining signal integrity. Use Value: Low pulse width distortion (1.5 ns typ) preserves timing margins for high-speed SPI clocks up to 75 MHz; 2.7–5.5 V dual supply accommodates mixed-voltage system design. |
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; lacks per-channel enable and has higher 8.5 ns max propagation delay. | Not suitable for five-signal isolation without stacking; less flexible for partial channel shutdown in power-sensitive designs. | Choose ADUM141DARZ only if exactly four channels are needed and per-channel enable is unnecessary. |
| ISO6751QDR | Five-channel, 50 Mbps, 5 kVRMS, SOIC-16; lower speed but higher isolation rating and integrated LDO on output side. | Better suited for high-isolation, low-speed applications like PLC backplane isolation; cannot replace SI8455BA-B-ISR in 100+ Mbps links. | Select ISO6751QDR when 5 kVRMS working voltage is mandatory and data rates stay below 50 Mbps. |
Compared with ADUM141DARZ and ISO6751QDR, SI8455BA-B-ISR uniquely combines five-channel count, 150 Mbps speed, per-channel enable, and industrial temperature support in a single SOIC-16 package-making it optimal for space-constrained, high-speed motor control and BMS designs where timing precision and channel-level control are critical.
Availability
SI8455BA-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 and long-lifecycle support.
Supply support for SI8455BA-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 Si84xx family was designed specifically for high-reliability, high-speed digital isolation in harsh electromagnetic environments-targeting motor drives, renewable energy inverters, and isolated power conversion where legacy optocouplers fall short in speed, power, and lifetime.
FAQ
What is the maximum data rate supported by SI8455BA-B-ISR?
The SI8455BA-B-ISR supports a maximum data rate of 150 Mbps across all five channels. This specification is guaranteed over the full operating temperature range (–40 to 125 °C) and supply voltage range (2.70–5.5 V), making it suitable for high-speed SPI, RS-485, and PWM isolation in demanding industrial applications. The device achieves this without requiring external timing components or initialization sequences.
Does SI8455BA-B-ISR require external bypass capacitors?
Yes, SI8455BA-B-ISR requires a 0.1 µF ceramic bypass capacitor placed as close as possible to each VDD pin (VDD1 and VDD2) relative to its respective ground (GND1 and GND2). These capacitors stabilize the internal regulators and RF oscillator, ensuring specified timing performance and noise immunity. No other external components are needed for basic operation.
What safety certifications does SI8455BA-B-ISR hold?
SI8455BA-B-ISR is certified to UL 1577 (2500 VRMS, 1 minute), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2. These certifications validate its reinforced insulation capability for use in industrial equipment, medical power supplies, and EV charging systems where functional safety and long-term reliability are mandated.
How does the enable function operate on SI8455BA-B-ISR?
Each channel of SI8455BA-B-ISR has a dedicated enable input (EN1–EN5). When an ENx pin is driven low, the corresponding output (OUTx) enters a high-impedance state (Revision B, which applies to SI8455BA-B-ISR). This allows dynamic channel gating for power savings or bus sharing. EN pins can be tied high for always-on operation or controlled by MCU GPIOs for selective isolation.
Is SI8455BA-B-ISR recommended for new designs?
No-Silicon Labs explicitly marks SI8455BA-B-ISR as "Not Recommended for New Designs" in Rev. 1.6 of its datasheet (dated April 2018). While fully functional and supported for existing production, designers should evaluate newer alternatives such as the Si88xx or Si86xx families for improved power efficiency, enhanced CMTI, or extended lifetime availability before initiating new projects.
SI8455BA-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:
- 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-SOIC
SI8455BA-B-ISR FAQ
1.How can I place an order for SI8455BA-B-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI8455BA-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 SI8455BA-B-ISR reliable?
The price and inventory of SI8455BA-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 SI8455BA-B-ISR is usually 5 days.
3.What payment methods are accepted for SI8455BA-B-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8455BA-B-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI8455BA-B-ISR?
SI8455BA-B-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI8455BA-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 SI8455BA-B-ISR?
For technical support, including SI8455BA-B-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8455BA-B-ISR requirements.
6.How does Aetrix verify that SI8455BA-B-ISR is sourced from the original manufacturer or authorized distributors?
All SI8455BA-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 SI8455BA-B-ISR meets industry standards.
7.What is the process for return or replacement of SI8455BA-B-ISR?
All SI8455BA-B-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI8455BA-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 SI8455BA-B-ISR part is unused and in its original packaging.
Return procedure for SI8455BA-B-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI8455BA-B-ISR Tags
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ISO1212DBQR
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7762FDBQR
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ISO7741DWR
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