My Inquiry
My Account
Skyworks Solutions Inc. SI88440BD-ISR
- Part No.:
- SI88440BD-ISR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88440BD-ISR.pdf
- Description:
- IC DGTL ISO 5KV 4CH GP 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,168
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SI88440BD-ISR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 5 W output power at 5 V, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and reinforced isolation rated at 5000 VRMS. It serves as a complete signal + power isolation solution in high-noise industrial motor drives and battery management systems.
For engineers reviewing the SI88440BD-ISR datasheet, SI88440BD-ISR pinout, SI88440BD-ISR application, or SI88440BD-ISR equivalent, this page delivers verified specifications, SOIC-20 wide-body package details, functional pin mapping, automotive-grade AEC-Q100 qualification, and two validated alternative parts for high-voltage input (≥24 V) isolated power + signal transfer.
Technical Context
The SI88440BD-ISR implements four unidirectional RF-based digital isolation channels across a silicon dioxide capacitive barrier, using on/off keying modulation for superior noise immunity and magnetic field rejection. Its isolated flyback DC-DC controller operates with external NMOS switch (driven by ESW), current sense (RSN), and secondary-side voltage feedback (VSNS).
This variant is configured for high-voltage primary-side operation (up to 24 V input), requiring external power switch and shunt resistor, and uses 100 kΩ compensation resistance (RCOMP) at the COMP pin. It lacks shutdown (SH) and soft-start (SS) pins-features reserved for Si883xx/Si886xx-and defaults to 250 kHz switching frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS reinforced insulation per UL 1577, CSA 62368-1, VDE 62368-1 - enables safety-critical industrial and automotive system compliance. |
| Data Rate | Up to 100 Mbps - supports high-speed serial interfaces including SPI, RS-485 transceiver control, and real-time encoder feedback. |
| Propagation Delay | ≤23 ns max - ensures tight timing alignment in closed-loop motor control and fast-response protection circuits. |
| DC-DC Output Power | Up to 5 W peak (2 W average at 5 V) - powers isolated gate drivers, ADCs, and microcontrollers without auxiliary supply. |
| Input Voltage Range | Up to 24 V on primary side - designed for direct connection to industrial 24 V rails or EV battery stacks without pre-regulation. |
| Operating Temperature | –40 °C to +125 °C - qualified for under-hood automotive and factory-floor industrial environments. |
| AEC-Q100 Grade | Qualified per AEC-Q100 Rev H - meets automotive reliability requirements for hybrid/electric vehicle traction inverters and BMS. |
Pinout & Package
SI88440BD-ISR is housed in a RoHS-compliant SOIC-20 wide-body package (10.3 mm × 7.5 mm, 1.27 mm pitch), optimized for creepage/clearance compliance in 5000 VRMS applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | HF XMTR (A-side) | High-frequency transmitter inputs for channels A1–A4 - accept CMOS logic signals from MCU/ASIC on primary side. |
| 7, 8, 14, 13 | HF RCVR (B-side) | High-frequency receiver outputs for channels B1–B4 - deliver isolated logic outputs to gate drivers or sensors on secondary side. |
| 9, 10 | GNDP / RSN | Primary-side power ground and current-sense input - connects to shunt resistor for external FET overcurrent protection. |
| 11 | ESW | External switch driver output - directly drives gate of external NMOS FET in high-voltage flyback topology. |
| 12 | VDDA | Primary-side digital supply (≤5.5 V) - powers isolation transmitter circuitry; may require external LDO if primary rail >5.5 V. |
| 15 | GNDA | Primary-side digital ground - must be shorted to GNDP with low-inductance trace per layout guidelines. |
| 16 | VREGA | Internal voltage reference output - used with external NPN transistor to generate VDDA when primary supply exceeds 5.5 V. |
| 17, 18 | GNDB / VDDB | Secondary-side digital ground and supply - powers isolated receivers; regulated output of internal DC-DC converter. |
| 19 | DNC/VREGB | Do Not Connect (≤5.5 V output) or Zener reference (>5.5 V output) - left floating unless designing >5.5 V isolated output. |
| 20 | VSNS | Voltage sense feedback input - connects to resistor divider on secondary side to regulate isolated output voltage. |
Key Features
| Feature | Design Value |
|---|---|
| RF-based digital isolation | On/off keying modulation provides >100 kV/µs transient immunity and immunity to magnetic fields - eliminates need for shielding in noisy motor drive environments. |
| Integrated flyback DC-DC controller | Supports up to 24 V primary input with external NMOS switch and current sense - removes requirement for separate isolated DC-DC module. |
| Secondary-side voltage sensing | VSNS feedback loop closes regulation on isolated side - achieves ±3% load/line regulation without optocouplers or secondary-side biasing. |
| Automotive-grade qualification | AEC-Q100 Rev H qualified with AIAG PPAP support - enables use in ASIL-B compliant traction inverter subsystems. |
| Thermal protection & cycle skipping | Automatic thermal shutdown and light-load cycle skipping - maintains efficiency >75% from 10% to full load while preventing junction overheating. |
Applications
| Industrial Motor Drives | Battery Management Systems |
|---|---|
Use Scenario: Isolating PWM gate signals and current-sense feedback between MCU and IGBT/SiC half-bridge in servo drives. IC Role / Device Role / Timing Role: Quad-channel isolator transfers four independent control signals across 5 kVRMS barrier; integrated DC-DC powers isolated gate driver ICs. Use Value: Eliminates need for separate isolated power supply and reduces PCB area by 35% versus discrete isolator + DC-DC solution. |
Use Scenario: Monitoring cell voltages and pack temperature in 400–800 V EV battery packs with centralized BMS controller. IC Role / Device Role / Timing Role: Provides isolated communication path for daisy-chained monitoring ICs and powers their local analog front-ends via VDDB. Use Value: Enables reinforced insulation compliance per ISO 6469-3 while maintaining <23 ns timing skew across all 4 channels for synchronized sampling. |
| Programmable Logic Controllers | Traction Inverters |
Use Scenario: Isolating digital I/O, encoder inputs, and fieldbus communications in modular PLC backplanes operating at 24 V DC. IC Role / Device Role / Timing Role: Replaces optocoupler banks and isolated DC-DC converters with single-component solution for both signal and power isolation. Use Value: Reduces component count by 60% and improves long-term reliability - MTBF >10 million hours per IEC 62380. |
Use Scenario: Controlling dual three-phase inverter legs in hybrid electric vehicle powertrain with fault-tolerant isolation. IC Role / Device Role / Timing Role: Delivers matched-propagation-delay isolation for six PWM channels (via two SI88440BD-ISR) and powers isolated current-sense amplifiers. Use Value: Supports ASIL-C diagnostic coverage through built-in thermal shutdown and cycle-skipping behavior detectable via VDDB ripple monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel isolated power + signal applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88441BD-ISR | Same SOIC-20 package, identical pinout, but includes SH_FC and SS pins for programmable shutdown and soft-start - requires external capacitor/resistor network. | Preferred where controlled power-up sequencing or dynamic converter disable is required (e.g., safety interlock in medical equipment). | Select SI88441BD-ISR only if SH_FC/SS functionality is needed; SI88440BD-ISR offers simpler layout and lower BOM cost for fixed-frequency operation. |
| ADUM6420ARWZ | Analog Devices part with 4-channel isolator + 500 mW isolated DC-DC; smaller SOIC-16 package; no external switch support; max 24 V input limited to 3.3/5 V output only. | Suitable for low-power applications (<500 mW) where space is constrained and high-voltage primary-side operation is not required. | Choose ADUM6420ARWZ for compact, low-power designs; SI88440BD-ISR is required for >2 W isolated power and 24 V-to-24 V conversion capability. |
Compared with SI88441BD-ISR, SI88440BD-ISR simplifies design by omitting programmable frequency and shutdown controls - reducing external component count and layout complexity. Against ADUM6420ARWZ, it delivers 10× more isolated power and supports high-voltage primary-side topologies essential for industrial and automotive traction systems.
Availability
SI88440BD-ISR is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, and programmable logic controller applications requiring stable component supply, AEC-Q100 qualification, and 5000 VRMS reinforced isolation.
Supply support for SI88440BD-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
Skyworks Solutions is a global leader in semiconductor innovation, specializing in analog and mixed-signal connectivity solutions for wireless, automotive, and industrial markets.
The Si88x4x family was engineered to replace optocoupler + discrete DC-DC combinations in high-reliability, high-noise environments - targeting electric vehicle powertrains, industrial automation, and medical diagnostics equipment.
FAQ
What is the maximum input voltage supported by SI88440BD-ISR?
The SI88440BD-ISR supports primary-side input voltages up to 24 V DC. It is specifically designed for high-voltage configurations - unlike Si882xx/Si883xx variants - and requires an external NMOS power switch driven by the ESW pin. Input voltage beyond 24 V is not supported and may damage the device.
Does SI88440BD-ISR include a shutdown pin?
No, SI88440BD-ISR does not include a shutdown (SH) or shutdown/frequency control (SH_FC) pin. This functionality is absent per datasheet Section 2.3.1, which explicitly states "This feature is not available on the Si884xx." The device operates continuously when powered; external enable/disable must be implemented at the primary-side VDDA or ESW driver stage.
What transformer is recommended for SI88440BD-ISR in a 24 V to 5 V application?
For 24 V input to 5 V isolated output, Skyworks validates the UMEC UTB02250s (12–24 V input, 3.3–5.5 V output, 3.0:1 turns ratio, 5 kVRMS isolation) and Coilcraft TA7788-AL (12 V input, 5 V output, multi-winding, 5 kVRMS). Both meet leakage inductance (<600 nH), primary inductance (25 µH ±5%), and isolation rating requirements specified in AN901.
Can SI88440BD-ISR power external circuitry on the isolated side?
Yes, SI88440BD-ISR can deliver up to 5 W peak (2 W continuous) to external loads on the isolated side via VDDB. This includes powering isolated gate drivers (e.g., Si823x), ADCs, op-amps, or microcontrollers - provided total current draw remains within VDDB's 1 A limit and thermal limits are observed per derating curves in the datasheet.
Is SI88440BD-ISR pin-compatible with other Si88x4x variants?
SI88440BD-ISR shares the same SOIC-20 pinout as SI88441BD-ISR and SI88442BD-ISR (per Figure 3), but differs from Si882xx/Si883xx/Si886xx families. Critical differences include absence of SH/SS pins and presence of RSN/ESW - making it incompatible with designs using Si88240 or Si88340 without schematic and layout revision.
SI88440BD-ISR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Package/Case:
- 20-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:
- 4
- Inputs - Side 1/Side 2:
- 4/0
- Channel Type:
- Unidirectional
- Voltage - Isolation:
- 5000Vrms
- 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:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SI88440BD-ISR FAQ
1.How can I place an order for SI88440BD-ISR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88440BD-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 SI88440BD-ISR reliable?
The price and inventory of SI88440BD-ISR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88440BD-ISR is usually 5 days.
3.What payment methods are accepted for SI88440BD-ISR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88440BD-ISR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88440BD-ISR?
SI88440BD-ISR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88440BD-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 SI88440BD-ISR?
For technical support, including SI88440BD-ISR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88440BD-ISR requirements.
6.How does Aetrix verify that SI88440BD-ISR is sourced from the original manufacturer or authorized distributors?
All SI88440BD-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 SI88440BD-ISR meets industry standards.
7.What is the process for return or replacement of SI88440BD-ISR?
All SI88440BD-ISR units undergo pre-shipment inspection (PSI). If there is an issue with SI88440BD-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 SI88440BD-ISR part is unused and in its original packaging.
Return procedure for SI88440BD-ISR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88440BD-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
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…
