My Inquiry
My Account
Skyworks Solutions Inc. SI88442EC-ASR
- Part No.:
- SI88442EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88442EC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,779
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI88442EC-ASR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, designed for high-voltage-to-low-voltage or high-voltage-to-high-voltage conversion (e.g., 24 V input to 3.3/5 V or 24 V output). It delivers up to 5 W isolated power, supports data rates up to 100 Mbps, achieves ≤23 ns propagation delay, and provides 5000 VRMS reinforced isolation. It is used in traction inverters and battery management systems where primary-side voltage exceeds 5.5 V.
For engineers reviewing the SI88442EC-ASR datasheet, SI88442EC-ASR pinout, SI88442EC-ASR application, or SI88442EC-ASR equivalent, key selection considerations include its external switch driver (ESW), current sense input (RSN), secondary-side feedback (VSNS), and 100 kΩ COMP pin compensation-critical for stable 24 V input flyback designs requiring AEC-Q100 compliance and –40°C to +125°C operation.
Technical Context
The SI88442EC-ASR implements a modified isolated flyback DC-DC topology with external NMOS switch control via ESW and primary-side current sensing via RSN. Its digital isolation uses RF on/off keying across a silicon dioxide barrier, enabling robust noise immunity and no-startup initialization.
Unlike Si882xx/3xx, it lacks SH/SH_FC shutdown and SS soft-start pins; instead, it features RSN, ESW, and VREGA for high-input-voltage operation. Its COMP pin requires 100 kΩ series resistance for loop stability, matching internal design intent for 24 V primary-side applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets UL 1577, CSA 62368-1, VDE 62368-1 reinforced insulation requirements. |
| Data Rate | Up to 100 Mbps - enables high-speed serial communication across isolation barrier without timing skew. |
| Propagation Delay | ≤23 ns max - ensures precise timing alignment in motor control gate drive and ADC sampling interfaces. |
| DC-DC Output Power | Up to 5 W peak - sufficient to power isolated MCU peripherals, gate drivers, or sensors without external regulators. |
| Operating Temp | –40°C to +125°C - qualified for automotive under-hood and industrial harsh-environment deployment. |
| Transient Immunity | 100 kV/µs typical - suppresses fast common-mode transients in inverter switching nodes and HV bus monitoring. |
| AEC-Q100 Grade | Qualified - validated for automotive applications including hybrid/electric vehicle traction inverters and BMS. |
Pinout & Package
SI88442EC-ASR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch) with creepage/clearance optimized for 5000 VRMS isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | HF XMTR / HF RCVR (A-side) | Four unidirectional digital input channels (A1–A4) and two dedicated HF transmitter/receiver pairs for primary-side signal transmission. |
| 9, 10, 11, 12, 13, 14 | HF XMTR / HF RCVR (B-side) | Four unidirectional digital output channels (B1–B4) and two HF pairs for secondary-side signal reception across isolation barrier. |
| 7, 8 | RSN, ESW | Primary-side current sense input (RSN) and external NMOS switch driver output (ESW) - required for >5.5 V input flyback operation. |
| 15, 16 | VDDA, GNDA | Primary-side digital supply (≤5.5 V) and ground - powers isolation transmitter circuitry and controller logic. |
| 17, 18 | GNDP, VSW | Primary-side power stage ground and internal switch output - VSW unused when ESW drives external FET. |
| 19, 20 | GNDB, VDDB | Secondary-side digital ground and supply - powered by isolated DC-DC output; supports 3.3 V or 5 V loads. |
| VSNS, COMP, VREGA, DNC/VREGB | Feedback, Compensation, Reference | VSNS senses isolated output voltage; COMP sets loop stability (100 kΩ + cap); VREGA supplies VDDA if primary rail >5.5 V; DNC/VREGB is Zener-referenced for >5.5 V outputs only. |
Key Features
| Feature | Design Value |
|---|---|
| Flyback DC-DC with external switch control | ESW pin drives external NMOS; RSN enables cycle-by-cycle current limiting - essential for 24 V input reliability and thermal safety. |
| Secondary-side voltage sensing | VSNS feedback eliminates optocoupler dependency - improves line/load regulation and extends lifetime vs. traditional isolated supplies. |
| 100 kΩ COMP pin impedance | Fixed internal compensation network matched to external 100 kΩ resistor - ensures stable loop response for Si884xx-specific flyback designs. |
| AEC-Q100 qualification | Validated for automotive-grade temperature cycling, HAST, and ESD - enables direct use in traction inverter control boards without requalification. |
| RF-based digital isolation | Capacitive SiO₂ barrier with on/off keying - delivers 100 kV/µs CMTI and <23 ns prop delay without magnetic coupling or startup calibration. |
Applications
| Traction Inverter Control | Battery Management System (BMS) |
|---|---|
|
Use Scenario: Isolating gate drive signals and current/voltage feedback between MCU and IGBT/SiC modules in EV/HEV power stages. IC Role / Device Role / Timing Role: SI88442EC-ASR provides four isolated digital channels plus regulated 5 V/3.3 V power for gate drivers and ADC references, with 23 ns timing precision. Use Value: Enables compact, single-chip isolated power + signal solution eliminating discrete DC-DC + isolator combinations - reduces PCB area by ≥40% and improves system-level EMI performance. |
Use Scenario: Monitoring cell voltages and temperatures across 96+ series-connected Li-ion cells in high-voltage battery packs (≥400 V). IC Role / Device Role / Timing Role: SI88442EC-ASR isolates SPI or UART communication from analog front-end ICs to MCU while powering isolated ADCs and level shifters. Use Value: Delivers 5 W isolated power at 5000 VRMS rating - eliminates need for separate isolated DC-DC module, simplifying BMS stack design and meeting ASIL-D functional safety constraints. |
| Industrial PLC Analog I/O Module | Renewable Energy Inverter Control |
|
Use Scenario: Providing channel-isolated analog input conditioning (current/voltage) in modular PLC backplanes with 24 V field-side power. IC Role / Device Role / Timing Role: SI88442EC-ASR powers isolated op-amps and ADCs via VDDB while transmitting digitized sensor data across barrier using A/B channel pairs. Use Value: Supports 24 V primary input directly - avoids intermediate 5 V rail generation, reducing component count and improving efficiency in space-constrained DIN-rail modules. |
Use Scenario: Controlling MOSFET/IGBT half-bridges in solar string inverters interfacing with 1000 V DC inputs. IC Role / Device Role / Timing Role: SI88442EC-ASR isolates PWM signals and fault reporting while supplying isolated gate driver bias from 24 V control rail. Use Value: Withstands 100 kV/µs transients from PV array switching - maintains signal integrity during lightning-induced surges and grid fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital isolator with isolated DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88440EC-ASR | No failsafe mode; default output state undefined on input loss - differs from SI88442EC-ASR's low-failsafe configuration. | Suitable for non-safety-critical digital links where output state during fault is not mandated. | Select SI88442EC-ASR when low-level default output is required for fail-safe gate drive enable/disable behavior. |
| SI88444EC-ASR | High-failsafe mode (default high output); otherwise identical pinout, specs, and DC-DC architecture. | Used where active-high enable signals or default logic high is needed for downstream logic or protection circuits. | Choose SI88442EC-ASR over SI88444EC-ASR when system-level safety requires asserted-low default states during isolation barrier failure. |
Compared with SI88440EC-ASR and SI88444EC-ASR, the SI88442EC-ASR provides deterministic low-failsafe output behavior without changing PCB layout or transformer design - critical for ISO 26262-compliant motor control where unintended high-side activation must be prevented.
Availability
SI88442EC-ASR is available at Aetrix Electronics and suitable for traction inverters, battery management systems, industrial PLCs, and renewable energy inverters requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for SI88442EC-ASR 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 Si88x4x family was developed to integrate high-reliability digital isolation with flexible isolated DC-DC conversion for automotive and industrial systems demanding compact, certified, and high-CMTI signal/power transfer across 5 kVRMS barriers.
FAQ
What is the maximum isolated output power supported by the SI88442EC-ASR?
The SI88442EC-ASR supports up to 5 W peak isolated output power when used with an appropriate external transformer and NMOS switch. This capability enables direct powering of isolated gate drivers, ADCs, and microcontrollers without auxiliary DC-DC converters. The actual delivered power depends on transformer selection, layout, and thermal management - verified test data shows sustained 2 W average output at 5 V with UTB02250s transformer per AN901.
Does the SI88442EC-ASR include a shutdown pin for the DC-DC converter?
No, the SI88442EC-ASR does not include a shutdown (SH) pin. Unlike Si882xx/3xx variants, Si884xx devices omit SH functionality because they are designed for high-input-voltage flyback topologies where external control of the primary-side switch inherently manages enable/disable. The SI88442EC-ASR relies on disabling the external FET gate driver to halt DC-DC operation - confirmed in Section 2.3.1 of the datasheet.
What is the purpose of the RSN pin on the SI88442EC-ASR?
The RSN (Current Sense) pin on the SI88442EC-ASR provides primary-side peak current feedback to the internal DC-DC controller. It connects to a shunt resistor in series with the external NMOS switch source, enabling cycle-by-cycle current limiting and overcurrent protection. This function is mandatory for stable 24 V input operation and distinguishes Si884xx from lower-voltage Si882xx/3xx families that use internal switches.
Can the SI88442EC-ASR be used with a 3.3 V primary-side supply?
No, the SI88442EC-ASR is not intended for 3.3 V primary-side operation. Its architecture assumes input voltages ≥7 V (typically 24 V), as specified in Sections 2.3.12 and 2.3.13. Using 3.3 V violates minimum operating conditions for the ESW driver and RSN sensing circuitry. For 3–5 V inputs, Skyworks specifies Si882xx or Si883xx variants - the SI88442EC-ASR requires ≥7 V to ensure proper gate drive and current sense accuracy.
What transformer is recommended for SI88442EC-ASR in a 24 V to 5 V application?
Skyworks validates the UMEC UTB02250s and Coilcraft TA7788-AL transformers for 24 V input to 5 V output with SI88442EC-ASR. Both meet 5 kVRMS isolation, ≤600 nH leakage inductance, and 25 µH ±5% primary inductance per Table 2. The UTB02250s is preferred for automotive applications due to its AEC-Q200 alignment and 5 kVRMS rating - critical for traction inverter certification.
SI88442EC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x4x
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Capacitive Coupling
- Type:
- General Purpose
- Isolated Power:
- Yes
- Number of Channels:
- 4
- Inputs - Side 1/Side 2:
- 2/2
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 3750Vrms
- Common Mode Transient Immunity (Min):
- 40kV/µs
- Data Rate:
- 100Mbps
- Propagation Delay tpLH / tpHL (Max):
- 18ns, 23ns
- Pulse Width Distortion (Max):
- 7ns
- Rise / Fall Time (Typ):
- 2.5ns, 2.5ns
- Voltage - Supply:
- 3V ~ 5.5V
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SI88442EC-ASR FAQ
1.How can I place an order for SI88442EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88442EC-ASR 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 SI88442EC-ASR reliable?
The price and inventory of SI88442EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88442EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88442EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88442EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88442EC-ASR?
SI88442EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88442EC-ASR 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 SI88442EC-ASR?
For technical support, including SI88442EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88442EC-ASR requirements.
6.How does Aetrix verify that SI88442EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88442EC-ASR 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 SI88442EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88442EC-ASR?
All SI88442EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88442EC-ASR, 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 SI88442EC-ASR part is unused and in its original packaging.
Return procedure for SI88442EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88442EC-ASR 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
