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Skyworks Solutions Inc. SI88340EC-ASR
- Part No.:
- SI88340EC-ASR
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- Digital Isolators
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SI88340EC-ASR.pdf
- Description:
- LINEAR IC
- Quantity:
- Payment:
- Shipping:
Inventory:4,698
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Product details
Overview
SI88340EC-ASR from Skyworks Solutions is a quad-channel digital isolator with integrated isolated DC-DC converter, delivering up to 2 W output power at 3.3 V or 5.0 V, supporting data rates up to 100 Mbps, propagation delay ≤23 ns, and 5000 VRMS isolation rating. It serves as a complete signal + power isolation solution in industrial motor control and battery management systems.
For engineers reviewing the SI88340EC-ASR datasheet, SI88340EC-ASR pinout, SI88340EC-ASR application, or SI88340EC-ASR equivalent, this page provides verified functional specifications, SOIC-24 wide-body package mapping, confirmed pin roles (including SH_FC, SS, VSNS, COMP), and two validated alternative parts for 3–5 V input to 3–5 V isolated output configurations.
Technical Context
The SI88340EC-ASR implements four unidirectional CMOS isolation channels using RF on/off keying across a silicon dioxide capacitive barrier, enabling robust noise immunity and no-startup initialization. Its integrated flyback DC-DC controller operates in peak current mode with secondary-side voltage sensing via VSNS and closed-loop regulation through internal feedback transmission.
This variant supports low-voltage configuration (3–5 V input to 3–5 V output) with internal power switches (VSW), programmable switching frequency (200–800 kHz via SH_FC/SS RC network), soft-start control (capacitor on SS), and shutdown (SH_FC high). It does not support external FET drive (ESW/RSN) or high-voltage input (>5.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Rating | 5000 VRMS for 1 minute - meets reinforced insulation requirements per UL 1577, CSA 62368-1, VDE 62368-1. |
| Data Rate | Up to 100 Mbps - enables high-speed serial communication (e.g., SPI, RS-485, CAN FD) across isolation barrier. |
| Propagation Delay | ≤23 ns max - ensures tight timing alignment in real-time control loops and synchronous sampling applications. |
| DC-DC Output Power | 2 W average at 3.3/5.0 V - sufficient to power secondary-side MCU, ADC, or gate drivers without external regulators. |
| Operating Temp | –40 °C to +125 °C - qualified for automotive under-hood and industrial ambient environments. |
| Transient Immunity | 100 kV/µs typical - withstands fast-rising common-mode noise in motor drives and inverters. |
| Regulatory Certifications | UL, CSA, VDE, CQC certified - eliminates need for system-level safety requalification. |
Pinout & Package
SI88340EC-ASR is housed in a RoHS-compliant SOIC-24 wide-body package (15.4 mm × 7.5 mm, 1.27 mm pitch), optimized for creepage/clearance compliance at 5000 VRMS.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | VDDP, GNDP, VSW, VDDA, GNDA, NC | Primary-side power stage and signal supply pins; VSW drives internal transformer switch; NC must remain unconnected. |
| 7, 8, 17, 18 | SH_FC, SS, NC, NC | SH_FC enables dc-dc shutdown when high; SS sets soft-start time constant with external capacitor; both NC pins are unused. |
| 9, 10, 15, 16 | A1–A4 | Unidirectional input channels on primary side - accept CMOS logic levels (VDDA referenced). |
| 11, 12, 14, 13 | B1–B4 | Unidirectional output channels on secondary side - drive CMOS loads (VDDB referenced). |
| 19, 20, 21, 22, 23, 24 | GNDB, VDDB, DNC/VREGB, NC, VSNS, COMP | Secondary-side ground/power; VSNS senses output voltage divider; COMP connects R/C for loop compensation; DNC/VREGB is Do-Not-Connect for ≤5.5 V outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DC-DC with secondary sensing | Eliminates optocoupler-based feedback, improving load regulation (<±1.5%) and reducing BOM count by ≥3 components. |
| Programmable switching frequency | 200–800 kHz tuning via SH_FC/SS RC network - enables EMI optimization without changing transformer or layout. |
| Soft-start control | Capacitor on SS pin sets startup ramp time - prevents inrush current into downstream 3.3/5 V rails during power-up. |
| RF-based isolation architecture | On/off keying modulation delivers >100 kV/µs CMTI and 0–100 Mbps operation without duty-cycle dependency. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications including battery management and traction inverter control units. |
Applications
| Industrial Motor Control | PLC Digital I/O Modules |
|---|---|
|
Use Scenario: Isolating gate driver signals and feedback from 3-phase inverter power stages operating at 600 V bus voltage. IC Role / Device Role / Timing Role: SI88340EC-ASR provides four isolated logic channels plus local 5 V power for half-bridge drivers, with <23 ns channel-to-channel skew. Use Value: Enables compact, single-chip isolation + power for dual-leg gate drive, eliminating separate DC-DC and optocouplers while meeting IEC 61800-5-1 creepage requirements. |
Use Scenario: Providing isolated digital input/output between field-side 24 V sensors/actuators and 3.3 V microcontroller backplane. IC Role / Device Role / Timing Role: SI88340EC-ASR acts as bidirectional signal isolator with integrated 3.3 V secondary supply for level-shifting and sensor interface ICs. Use Value: Reduces PCB area by 40% vs. discrete isolator + regulator solution; maintains 100 Mbps throughput for high-density I/O scanning cycles. |
| Battery Management Systems | Isolated Switch-Mode Supplies |
|
Use Scenario: Isolating cell voltage monitoring and balancing commands between high-side analog front-end and low-side MCU in 400–800 V EV battery packs. IC Role / Device Role / Timing Role: SI88340EC-ASR delivers isolated 5 V power to AFE ICs while transmitting ADC readouts and balance enable signals across 5 kVRMS barrier. Use Value: Meets ASIL-B functional safety requirements via certified isolation; eliminates risk of ground loop-induced measurement error in multi-cell stacks. |
Use Scenario: Replacing optocoupler-based feedback in auxiliary 5 V/2 W isolated supplies for industrial HMIs and controllers. IC Role / Device Role / Timing Role: SI88340EC-ASR replaces TL431 + optocoupler combo, providing direct secondary-side voltage sensing and regulation. Use Value: Improves line/load regulation to ±1.2% (vs. ±3% typical with optocouplers); reduces temperature drift by 60% due to on-chip reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad digital isolator with integrated DC-DC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SI88341EC-ASR | Same SOIC-24 package and pinout; differs only in failsafe state (A1–A4 default high vs. SI88340EC-ASR default low). | Used where primary-side logic defaults must assert active-high enable on power loss (e.g., safety interlock circuits). | Select SI88341EC-ASR only if system requires high-failsafe behavior; otherwise SI88340EC-ASR is drop-in compatible. |
| ADUM6420ARWZ | SOIC-24, 4-channel, 5000 VRMS, but uses iCoupler magnetic isolation; DC-DC output fixed at 5 V, no frequency/soft-start adjustment. | Lacks programmable frequency and soft-start; lower efficiency (72% vs. 83% peak) and higher EMI without dithering. | Choose ADUM6420ARWZ only if magnetic isolation is mandated; SI88340EC-ASR offers superior EMI control and design flexibility. |
Compared with SI88340EC-ASR, SI88341EC-ASR provides identical performance with inverted failsafe logic, while ADUM6420ARWZ trades programmability and RF-based EMI resilience for magnetic isolation compatibility - making SI88340EC-ASR optimal for noise-sensitive motor control and automotive BMS designs requiring tunable power stage behavior.
Availability
SI88340EC-ASR is available at Aetrix Electronics and suitable for industrial motor control, battery management systems, and PLC digital I/O modules requiring stable component supply, long-term lifecycle support, and certified safety compliance.
Supply support for SI88340EC-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 designed to replace optocoupler-based isolation + discrete DC-DC in industrial and automotive systems, integrating robust signal integrity, certified safety, and flexible power conversion in a single SOIC package.
FAQ
What is the maximum output power capability of the SI88340EC-ASR's integrated DC-DC converter?
The SI88340EC-ASR delivers up to 2 W average output power at 3.3 V or 5.0 V under continuous operation. This is sufficient to power secondary-side microcontrollers, ADCs, or gate drivers without external regulation. Peak power exceeds 5 W briefly during startup, but thermal limits constrain sustained delivery to 2 W. The SI88340EC-ASR achieves this using internal power switches and secondary-side feedback, eliminating optocouplers and simplifying design.
Does the SI88340EC-ASR support external MOSFET drive for higher input voltages?
No. The SI88340EC-ASR is configured for low-voltage operation (3–5 V input) and uses internal power switches (VSW pin). It lacks ESW and RSN pins required for external FET drive. For 24 V input applications, Skyworks specifies Si884xx or Si886xx variants. Using SI88340EC-ASR above 5.5 V risks damage; its VDDP absolute maximum rating is 5.5 V, and the internal switch is rated only for ≤5.5 V operation.
How is the switching frequency programmed on the SI88340EC-ASR?
The SI88340EC-ASR allows programmable PWM frequency from 200 kHz to 800 kHz using an external resistor-capacitor network between SH_FC (Pin 7) and SS (Pin 8). The time constant sets the oscillator frequency; values are calculated per AN892. Unlike Si882xx/4xx fixed-frequency variants, SI88340EC-ASR gives designers EMI tuning capability without transformer redesign - a key differentiator for noise-sensitive motor control applications.
What is the function of the DNC/VREGB pin on the SI88340EC-ASR?
On the SI88340EC-ASR, the DNC/VREGB pin (Pin 19) must be left unconnected (DNC) because its internal Zener diode is intended only for >5.5 V output configurations. Since SI88340EC-ASR is rated for 3.3/5.0 V outputs, connecting this pin risks incorrect regulation or latch-up. The datasheet explicitly states "If output voltage is ≤ 5.5 V, this pin should be read as DNC or Do Not Connect." Misconnection violates safe operating area.
Is the SI88340EC-ASR pin-compatible with other Si8834x variants like SI88342EC-ASR?
Yes - all Si8834x variants (SI88340EC-ASR, SI88341EC-ASR, SI88342EC-ASR, SI88343EC-ASR, SI88344EC-ASR) share identical SOIC-24 pinout, electrical characteristics, and package dimensions. Differences are limited to failsafe logic state (A1–A4 default high/low) and internal configuration fuses. No PCB changes are needed when substituting within the Si8834x family, making SI88340EC-ASR suitable for design reuse across safety-critical and non-safety variants.
SI88340EC-ASR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- Si88x4x
- Package/Case:
- 24-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:
- 4/0
- 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:
- 24-SOIC
SI88340EC-ASR FAQ
1.How can I place an order for SI88340EC-ASR through Aetrix?
Please submit a Request for Quotation (RFQ) for SI88340EC-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 SI88340EC-ASR reliable?
The price and inventory of SI88340EC-ASR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SI88340EC-ASR is usually 5 days.
3.What payment methods are accepted for SI88340EC-ASR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SI88340EC-ASR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SI88340EC-ASR?
SI88340EC-ASR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SI88340EC-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 SI88340EC-ASR?
For technical support, including SI88340EC-ASR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SI88340EC-ASR requirements.
6.How does Aetrix verify that SI88340EC-ASR is sourced from the original manufacturer or authorized distributors?
All SI88340EC-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 SI88340EC-ASR meets industry standards.
7.What is the process for return or replacement of SI88340EC-ASR?
All SI88340EC-ASR units undergo pre-shipment inspection (PSI). If there is an issue with SI88340EC-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 SI88340EC-ASR part is unused and in its original packaging.
Return procedure for SI88340EC-ASR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SI88340EC-ASR Tags
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ISO1212DBQR
Texas Instruments
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ISO6721BDR
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SI8710AC-B-ISR
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ISO7720FDR
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ISO7721DR
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ISO7721FDR
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SI8710CC-B-ISR
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ISO6741FQDWRQ1
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ISO7721DWVR
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ISO7762FDBQR
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ISO7741DWR
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ISO7741FDWR
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