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Home > Products > Isolators > Digital Isolators

Skyworks Solutions Inc. SI8450BB-B-IS1R

Name: SI8450BB-B-IS1R
Brand: Skyworks Solutions Inc.
SKU: SI8450BB-B-IS1R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SI8450BB-B-IS1R

Manufacturer:: Skyworks Solutions Inc.

Category:: Digital Isolators

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SI8450BB-B-IS1R.pdf

Description:: DGTL ISO 2500VRMS 5CH GP 16SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SI8450BB-B-IS1R 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, 2.5 kV_RMS isolation, and operation from 2.70–5.5 V across –40 to +125 °C. It serves as a high-reliability signal barrier in isolated power supplies and motor control interfaces.

For engineers reviewing the SI8450BB-B-IS1R datasheet, SI8450BB-B-IS1R pinout, SI8450BB-B-IS1R application, or SI8450BB-B-IS1R equivalent, key selection criteria include channel count (5), isolation rating (2.5 kV_RMS), timing precision (0.5 ns typical channel-channel skew), low-power operation at 100 Mbps (<30 mA total), and SOIC-16 narrow-body package compatibility.

Technical Context

The SI8450BB-B-IS1R implements capacitive isolation using on-chip RF modulation/demodulation, enabling DC-to-150 Mbps signal transmission without start-up initialization. Its dual-supply architecture (VDD1/VDD2) supports independent 2.70–5.5 V domains per side, with integrated enable control and precise timing alignment across all five channels.

It achieves 25 kV/µs common-mode transient immunity (CMTI) and maintains stable propagation delay skew (<3 ns P-P) over temperature and voltage. Safety certification includes UL 1577 (2500 V_RMS), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 (560 V_PEAK working voltage).

Key Specifications

Parameter	Value and Actual Design Meaning
Channels	5 unidirectional isolated signal paths - enables full isolation of control, feedback, and communication lines in compact systems.
Max Data Rate	150 Mbps - supports high-speed serial interfaces such as isolated SPI, RS-485 transceiver control, and gate driver signaling.
Propagation Delay	3.0–9.5 ns (typ/max) - ensures sub-10 ns timing fidelity for real-time motor control and power converter feedback loops.
Isolation Rating	2500 V_RMS for 1 minute - meets reinforced insulation requirements for industrial and automotive auxiliary power systems.
Supply Voltage	2.70–5.5 V per side - allows direct interfacing with 3.3 V microcontrollers and 5 V analog front-ends without level-shifting.
CMTI	25 kV/µs - prevents false triggering in noisy environments like inverters and variable-frequency drives.
Operating Temp	–40 to +125 °C at 150 Mbps - qualified for under-hood automotive and industrial ambient conditions without derating.

Pinout & Package

SI8450BB-B-IS1R is housed in a 16-pin narrow-body SOIC package (7.5 mm width, JEDEC MS-012AC), with creepage/clearance certified to 4.01 mm / 4.9 mm and 2.5 kV_RMS isolation barrier between sides 1–8 and 9–16.

Pin/Terminal	Circuit Role	Design Meaning
VDD1	Primary-side supply	Power for input-side logic and channel 1–3 drivers; must be decoupled with 0.1 µF capacitor near pin.
GND1	Primary-side ground	Reference for input signals and VDD1; requires low-impedance connection to isolate noise coupling into secondary side.
IN1–IN3	Input channels 1–3	Digital inputs referenced to GND1; accept 2.0 V_H/0.8 V_L thresholds compatible with CMOS/LVTTL.
EN1	Enable for channels 1–3	Active-high control: drives outputs low when disabled; enables power-gating for standby mode.
VDD2	Secondary-side supply	Power for output-side logic and channel 4–5 drivers; independent of VDD1 for galvanic separation.
GND2	Secondary-side ground	Reference for output signals and VDD2; must be physically separated from GND1 by ≥8 mm on PCB.
OUT1–OUT3	Output channels 1–3	Inverted outputs relative to IN1–IN3; 85 Ω nominal output impedance for controlled-impedance trace matching.
OUT4–OUT5	Output channels 4–5	Non-inverting outputs; support independent enable via EN2 (pin 15) - not present on SI8450 variant.

Key Features

Feature	Design Value
Ultra-low power at 100 Mbps	<6.9 mA per side at 5 V - reduces thermal load in densely packed isolated gate driver modules.
Precision timing alignment	0.5 ns typical channel-channel skew - enables synchronized sampling across multiple isolated ADC channels.
No start-up initialization	Valid output within 40 µs of power application - eliminates boot-time delays in safety-critical power-on sequences.
High CMTI immunity	25 kV/µs - suppresses false edge detection during fast-switching events in SiC/GaN-based inverters.
RoHS-compliant SOIC-16	Lead-free, halogen-free package with 1.27 mm pitch - compatible with standard reflow profiles and automated assembly.

Applications

Industrial Motor Control	Isolated Switch-Mode Power Supply
Use Scenario: Isolating PWM signals and fault feedback between MCU and three-phase inverter gate drivers in servo drives. IC Role / Device Role / Timing Role: Five-channel barrier transmitting gate enable, dead-time control, and overcurrent status with <9.5 ns delay and <3 ns skew. Use Value: Enables tight-loop current regulation at >20 kHz switching frequencies while maintaining functional safety integrity.	Use Scenario: Providing isolated feedback for voltage regulation and primary-side sensing in offline AC/DC converters. IC Role / Device Role / Timing Role: Transmitting optocoupler-replacement error amplifier output and synchronous rectifier control with 150 Mbps capability. Use Value: Eliminates optocoupler aging and gain drift, improving long-term output voltage stability to ±0.5% over 10 years.
Hybrid Electric Vehicle Battery Management	Isolated Data Acquisition
Use Scenario: Isolating cell voltage monitoring and pack contactor control signals in high-voltage battery packs (up to 800 V). IC Role / Device Role / Timing Role: Five-channel interface between isolated ADCs and MCU, rated for 2.5 kV_RMS working voltage and 125 °C ambient. Use Value: Meets ISO 26262 ASIL-B requirements for voltage monitoring path integrity without external protection components.	Use Scenario: Isolating SPI bus between host processor and isolated ADC/DAC in high-precision test equipment. IC Role / Device Role / Timing Role: Transmitting clock, data, and chip-select signals across isolation barrier with matched propagation delay (±1.8 ns skew). Use Value: Preserves SPI timing margins at 50 MHz SCLK, enabling 16-bit data capture without setup/hold violations.

Industrial Motor Control

Isolated Switch-Mode Power Supply

Use Scenario: Isolating PWM signals and fault feedback between MCU and three-phase inverter gate drivers in servo drives.

IC Role / Device Role / Timing Role: Five-channel barrier transmitting gate enable, dead-time control, and overcurrent status with <9.5 ns delay and <3 ns skew.

Use Value: Enables tight-loop current regulation at >20 kHz switching frequencies while maintaining functional safety integrity.

Use Scenario: Providing isolated feedback for voltage regulation and primary-side sensing in offline AC/DC converters.

IC Role / Device Role / Timing Role: Transmitting optocoupler-replacement error amplifier output and synchronous rectifier control with 150 Mbps capability.

Use Value: Eliminates optocoupler aging and gain drift, improving long-term output voltage stability to ±0.5% over 10 years.

Hybrid Electric Vehicle Battery Management

Isolated Data Acquisition

Use Scenario: Isolating cell voltage monitoring and pack contactor control signals in high-voltage battery packs (up to 800 V).

IC Role / Device Role / Timing Role: Five-channel interface between isolated ADCs and MCU, rated for 2.5 kV_RMS working voltage and 125 °C ambient.

Use Value: Meets ISO 26262 ASIL-B requirements for voltage monitoring path integrity without external protection components.

Use Scenario: Isolating SPI bus between host processor and isolated ADC/DAC in high-precision test equipment.

IC Role / Device Role / Timing Role: Transmitting clock, data, and chip-select signals across isolation barrier with matched propagation delay (±1.8 ns skew).

Use Value: Preserves SPI timing margins at 50 MHz SCLK, enabling 16-bit data capture without setup/hold violations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital isolator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADUM141DBRZ	4-channel, 150 Mbps, 2.5 kV_RMS, SOIC-16 wide-body (10.3 mm)	Lacks fifth channel; wider package increases PCB area by 36% and reduces creepage margin for same layout.	Choose when only four isolated signals are needed and board space permits wider SOIC.
ISO6751QDR	5-channel, 50 Mbps, 5 kV_RMS, SOIC-16 narrow-body, higher CMTI (100 kV/µs)	Lower data rate limits use in high-speed SPI or gate driver timing; higher isolation suits medical mains-connected systems.	Prefer where enhanced isolation voltage (>3.75 kV_RMS) is mandatory and 50 Mbps suffices.

Compared with ADUM141DBRZ and ISO6751QDR, SI8450BB-B-IS1R uniquely delivers five-channel 150 Mbps performance in a narrow-body SOIC footprint with industry-leading timing precision (0.5 ns skew) and ultra-low 100 Mbps supply current (<30 mA), making it optimal for space-constrained, high-speed industrial inverters.

Availability

SI8450BB-B-IS1R is available at Aetrix Electronics and suitable for industrial motor control, isolated switch-mode power supplies, and hybrid electric vehicle battery management systems requiring stable component supply and long-term lifecycle support.

Supply support for SI8450BB-B-IS1R 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, low-power digital isolation in industrial automation, automotive electrification, and energy infrastructure, replacing optocouplers with superior speed, longevity, and temperature stability.

FAQ

What is the maximum operating temperature for SI8450BB-B-IS1R at full 150 Mbps data rate?

The SI8450BB-B-IS1R is fully specified for continuous operation at –40 to +125 °C ambient temperature while sustaining 150 Mbps across all five channels. This rating is validated per Table 1 in the datasheet under VDD = 5 V, CL = 15 pF, and worst-case process corner, with no derating required up to the upper limit. SI8450BB-B-IS1R maintains <9.5 ns propagation delay and <3 ns channel skew across this range.

Does SI8450BB-B-IS1R require external pull-up or pull-down resistors on its input pins?

No, SI8450BB-B-IS1R inputs have built-in hysteresis and do not require external biasing resistors. The VIH and VIL thresholds (2.0 V and 0.8 V respectively) are internally defined and stable over temperature and supply voltage. External resistors may be added only for specific ESD protection or noise filtering per system-level requirements, but are not necessary for basic logic-level compatibility.

How does the enable function operate on SI8450BB-B-IS1R?

SI8450BB-B-IS1R features a single enable pin (EN1, pin 4) that controls channels 1–3. When EN1 is low, OUT1–OUT3 are driven to logic low; when high, they replicate IN1–IN3 with inversion. There is no enable for channels 4–5 - those outputs are always active. Enable timing is characterized: data valid occurs within 8.0 ns (max) after EN1 rises, per Figure 1 and Table 3.

Can SI8450BB-B-IS1R operate with different supply voltages on each side (e.g., 3.3 V on VDD1 and 5 V on VDD2)?

Yes, SI8450BB-B-IS1R supports independent supply voltages on VDD1 and VDD2 within 2.70–5.5 V each. Electrical characteristics including VIH/VIL thresholds, VOL/VOH levels, and supply current are guaranteed across all combinations (e.g., 3.3 V/5 V, 5 V/3.3 V). This enables seamless interfacing between 3.3 V microcontrollers and 5 V analog subsystems without level shifters.

What safety certifications apply specifically to SI8450BB-B-IS1R?

SI8450BB-B-IS1R carries UL 1577 recognition (2500 V_RMS, File E257455), CSA Component Notice 5A (IEC 60950-1/61010-1), and VDE IEC 60747-5-2 certification (File 5006301-4880-0001). These apply to the 2.5 kV_RMS isolation rating and are verified on every production unit via 3.0 kV_RMS for 1 second testing, as stated in Table 6 and the regulatory summary on page 14 of the datasheet.

SI8450BB-B-IS1R 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:: 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

SI8450BB-B-IS1R FAQ

1.How can I place an order for SI8450BB-B-IS1R through Aetrix?

Please submit a Request for Quotation (RFQ) for SI8450BB-B-IS1R 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 SI8450BB-B-IS1R reliable?

The price and inventory of SI8450BB-B-IS1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI8450BB-B-IS1R is usually 5 days.

3.What payment methods are accepted for SI8450BB-B-IS1R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI8450BB-B-IS1R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SI8450BB-B-IS1R?

SI8450BB-B-IS1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SI8450BB-B-IS1R 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 SI8450BB-B-IS1R?

For technical support, including SI8450BB-B-IS1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI8450BB-B-IS1R requirements.

6.How does Aetrix verify that SI8450BB-B-IS1R is sourced from the original manufacturer or authorized distributors?

All SI8450BB-B-IS1R 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 SI8450BB-B-IS1R meets industry standards.

7.What is the process for return or replacement of SI8450BB-B-IS1R?

All SI8450BB-B-IS1R units undergo pre-shipment inspection (PSI). If there is an issue with SI8450BB-B-IS1R, 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 SI8450BB-B-IS1R part is unused and in its original packaging.

Return procedure for SI8450BB-B-IS1R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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