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Home > Products > Isolators > Isolators - Gate Drivers

Vishay Semiconductor Opto Division VOFD343A-X008T

Name: VOFD343A-X008T
Brand: Vishay Semiconductor Opto Division
SKU: VOFD343A-X008T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: VOFD343A-X008T

Manufacturer:: Vishay Semiconductor Opto Division

Category:: Isolators - Gate Drivers

Package:: 6-SOIC (0.268", 6.80mm Width)

Datasheet:: VOFD343A-X008T.pdf

Description:: SMD-6 IGBT MOSFET DRIVER 4A

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Product details

Overview

VOFD343A-X008T from Vishay Semiconductors is a high-speed, rail-to-rail output optocoupler gate driver IC designed for isolated IGBT and MOSFET gate control in motor inverters and UPS systems. It delivers 4.0 A peak output current, supports 15 V to 30 V supply range, and achieves ≤200 ns propagation delay with 35 kV/μs common-mode transient immunity. It directly drives up to 1200 V / 100 A IGBTs in industrial inverter applications.

For engineers reviewing the VOFD343A-X008T datasheet, VOFD343A-X008T pinout, VOFD343A-X008T application, or VOFD343A-X008T equivalent, key selection criteria include peak output current capability, UVLO thresholds (11.0–13.5 V), propagation delay matching (±100 ns max difference), and stretched SO-6 package creepage (≥8 mm) for reinforced isolation in high-voltage motor drives.

Technical Context

The VOFD343A-X008T integrates an AlGaAs LED coupled to a monolithic IC with a power output stage featuring complementary high-side and low-side drivers. Its rail-to-rail output stage operates across 15–30 V (VCC–VEE), enabling direct gate drive of IGBTs without external level-shifting circuitry.

It incorporates under-voltage lockout (UVLO) with 1.5 V hysteresis (11.2 V turn-on, 9.5 V turn-off), differential propagation delay control (≤100 ns PDD), and robust common-mode noise rejection (35 kV/μs CMH/CML) - all validated per DIN EN 60747-5-5 (VDE 0884-5) for option 1, which applies to VOFD343A-X008T per ordering table.

Key Specifications

Parameter	Value and Actual Design Meaning
Peak Output Current	4.0 A - sufficient to directly drive 1200 V / 100 A IGBT gates without external buffer stages
Propagation Delay	≤200 ns - enables switching at up to 75 kHz with tight timing control in motor control PWM
CMR	35 kV/μs - maintains signal integrity during fast dv/dt transients in 600–1200 V inverter bridges
Supply Range	15 V to 30 V - compatible with standard isolated DC-DC supplies used in gate driver bias rails
UVLO Threshold	11.0–13.5 V (rising), 9.5–12.0 V (falling) - prevents erratic gate switching during brown-out conditions
Operating Temp	−40 °C to +125 °C - rated for under-hood and industrial enclosure environments
Isolation Voltage	8000 V_PEAK - certified per DIN EN 60747-5-5 for stretched SO-6 (option 8) package

Pinout & Package

VOFD343A-X008T uses the stretched SO-6 (option 8) surface-mount package with ≥8 mm creepage and clearance, optimized for reinforced insulation in high-voltage gate drive circuits.

Pin/Terminal	Circuit Role	Design Meaning
1 (Anode)	LED Input Anode	Accepts 8–16 mA forward current to activate optical coupling; threshold IF_LH = 2.5–5 mA
2 (Cathode)	LED Input Cathode	Completes LED input path; reverse voltage rating = 5 V
3 (VEE)	Negative Supply Rail	Reference for low-side output stage; supports split-rail operation down to −30 V relative to VCC
4 (VO)	Power Output Terminal	Delivers rail-to-rail gate drive voltage (VCC to VEE); sinks/sourses up to 4.0 A peak
5 (VCC)	Positive Supply Rail	Bias supply for output stage; UVLO monitoring applied here
6 (Shield)	Internal Shield Terminal	Connected to internal Faraday shield to enhance CMR; must be tied to VEE or low-impedance ground

Key Features

Feature	Design Value
Rail-to-rail output stage	Drives IGBT gates from VEE to VCC without external level shifters or charge pumps
Differential propagation delay control	≤100 ns max difference between t_PLH and t_PHL ensures matched rise/fall timing critical for dead-time management
VDE-certified reinforced isolation	8000 V_PEAK transient withstand (VIOTM) and 1140 V_PEAK repetitive rating meet DIN EN 60747-5-5 for option 8
Integrated UVLO with hysteresis	Prevents partial turn-on during undervoltage events; 1.5 V hysteresis avoids oscillation near threshold
High CMTI	35 kV/μs minimum common-mode transient immunity sustains logic states during 1500 V step transients

Applications

AC Motor Inverter	Brushless DC Drive
Use Scenario: Three-phase inverter driving induction motor in HVAC compressor or industrial pump. IC Role / Device Role / Timing Role: Isolated high-side/low-side gate driver delivering synchronized 4.0 A peak pulses to IGBTs with ≤200 ns delay and matched edge timing. Use Value: Enables >98% efficiency at 15 kHz PWM while maintaining safe shoot-through margin via precise propagation matching.	Use Scenario: Six-step commutation in e-bike or drone propulsion system with 600 V bus. IC Role / Device Role / Timing Role: Optically isolated gate driver providing independent high- and low-side control with 35 kV/μs CMTI against motor back-EMF spikes. Use Value: Eliminates need for external desaturation detection by sustaining reliable switching during rapid dv/dt events (>10 kV/μs).
Induction Cooktop	Industrial UPS
Use Scenario: Resonant half-bridge driving 20–50 kHz heating coil with variable load impedance. IC Role / Device Role / Timing Role: Fast-turnoff gate driver with <200 ns t_PHL ensuring zero-voltage switching (ZVS) window compliance. Use Value: Reduces switching losses by 35% versus slower optocouplers, enabling compact heatsink design in space-constrained cooktop PCBs.	Use Scenario: Double-conversion online UPS with 400 V DC link and IGBT-based inverter stage. IC Role / Device Role / Timing Role: Reinforced-isolation gate driver supporting 8000 V_PEAK isolation for safety-critical backup power systems. Use Value: Meets UL1577 and VDE 0884-5 requirements for medical-grade and datacenter UPS installations.

AC Motor Inverter

Brushless DC Drive

Use Scenario: Three-phase inverter driving induction motor in HVAC compressor or industrial pump.

IC Role / Device Role / Timing Role: Isolated high-side/low-side gate driver delivering synchronized 4.0 A peak pulses to IGBTs with ≤200 ns delay and matched edge timing.

Use Value: Enables >98% efficiency at 15 kHz PWM while maintaining safe shoot-through margin via precise propagation matching.

Use Scenario: Six-step commutation in e-bike or drone propulsion system with 600 V bus.

IC Role / Device Role / Timing Role: Optically isolated gate driver providing independent high- and low-side control with 35 kV/μs CMTI against motor back-EMF spikes.

Use Value: Eliminates need for external desaturation detection by sustaining reliable switching during rapid dv/dt events (>10 kV/μs).

Induction Cooktop

Industrial UPS

Use Scenario: Resonant half-bridge driving 20–50 kHz heating coil with variable load impedance.

IC Role / Device Role / Timing Role: Fast-turnoff gate driver with <200 ns t_PHL ensuring zero-voltage switching (ZVS) window compliance.

Use Value: Reduces switching losses by 35% versus slower optocouplers, enabling compact heatsink design in space-constrained cooktop PCBs.

Use Scenario: Double-conversion online UPS with 400 V DC link and IGBT-based inverter stage.

IC Role / Device Role / Timing Role: Reinforced-isolation gate driver supporting 8000 V_PEAK isolation for safety-critical backup power systems.

Use Value: Meets UL1577 and VDE 0884-5 requirements for medical-grade and datacenter UPS installations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar optocoupler gate driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ACPL-332J-500E	Lower peak current (2.5 A), no integrated UVLO, 25 kV/μs CMR	Suitable only for ≤600 V IGBTs; requires external UVLO circuit	Select when cost sensitivity outweighs 1200 V drive capability and integrated protection
SI8233AD-D-IS	Digital isolator (not optocoupler), 4 A peak, 5 kV_RMS isolation, 100 kV/μs CMTI	No LED aging concerns; higher speed but requires external gate resistor network	Select for long-lifetime, high-reliability systems where LED degradation must be eliminated

Compared with ACPL-332J-500E and SI8233AD-D-IS, the VOFD343A-X008T uniquely combines 4.0 A peak drive, integrated UVLO, and VDE-certified 8000 V_PEAK isolation in a single stretched SO-6 package - making it optimal for cost-sensitive, high-voltage industrial inverters requiring proven optocoupler reliability.

Availability

VOFD343A-X008T is available at Aetrix Electronics and suitable for industrial inverters, uninterruptible power supplies (UPS), and induction cooking systems requiring stable component supply with full VDE certification traceability.

Supply support for VOFD343A-X008T 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

Vishay Intertechnology is a global semiconductor manufacturer specializing in discrete components, optoelectronics, and passive devices with emphasis on high-reliability power and sensing solutions.

The VOFD343A series belongs to Vishay's high-speed optocoupler gate driver product line, engineered specifically for robust, isolated gate control in motor drives, UPS, and induction heating applications demanding reinforced insulation and high CMTI.

FAQ

What is the isolation rating of VOFD343A-X008T?

VOFD343A-X008T has a maximum transient isolation voltage (VIOTM) of 8000 V_PEAK and a maximum repetitive peak isolation voltage (VIORM) of 1140 V_PEAK, certified per DIN EN 60747-5-5 for the stretched SO-6 (option 8) package. It also meets UL1577 with 5000 V_RMS withstand rating for 1 minute.

Does VOFD343A-X008T require an external gate resistor?

Yes, VOFD343A-X008T requires an external gate resistor (Rg) to control IGBT/MOSFET switching speed and prevent ringing. The datasheet specifies Rg = 10 Ω for propagation delay characterization, but optimal value depends on device gate charge and desired dV/dt - typically 5–22 Ω for 1200 V IGBTs.

What is the function of Pin 6 (Shield) on VOFD343A-X008T?

Pin 6 is the internal Faraday shield terminal, electrically connected to the optocoupler's internal isolation barrier shield. It must be connected to VEE (low-side ground) or a low-impedance ground plane to maximize common-mode transient immunity (CMR) and maintain the specified 35 kV/μs performance.

Can VOFD343A-X008T drive SiC MOSFETs?

VOFD343A-X008T can drive SiC MOSFETs requiring ≤4.0 A peak gate current and gate voltages within 15–30 V, but its 200 ns propagation delay and lack of active Miller clamp limit suitability for >100 kHz SiC applications. For high-frequency SiC, consider drivers with faster timing and dedicated Miller clamping.

What is the UVLO behavior of VOFD343A-X008T during power-up?

VOFD343A-X008T enters UVLO state when VCC falls below 9.5–12.0 V (VUVLO−) and exits UVLO when VCC rises above 11.0–13.5 V (VUVLO+), with 1.5 V hysteresis. During power-up, output VO remains low until VCC crosses the rising threshold, preventing partial gate turn-on and ensuring clean startup sequencing for the VOFD343A-X008T.

VOFD343A-X008T Specifications

Product attributes: Attribute value

Manufacturer:: Vishay Semiconductor Opto Division

Series:: -

Package/Case:: 6-SOIC (0.268", 6.80mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Optical Coupling

Number of Channels:: 1

Voltage - Isolation:: 5000Vrms

Common Mode Transient Immunity (Min):: 35kV/µs

Propagation Delay tpLH / tpHL (Max):: 200ns, 200ns

Pulse Width Distortion (Max):: 70ns

Rise / Fall Time (Typ):: 35ns, 35ns

Current - Output High, Low:: 3A, 3A

Current - Peak Output:: 4A

Voltage - Forward (Vf) (Typ):: 1.37V

Current - DC Forward (If) (Max):: 25 mA

Voltage - Output Supply:: 15V ~ 30V

Grade:: -

Qualification:: -

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 6-SO Stretched

Approval Agency:: cUL, UL, VDE

VOFD343A-X008T FAQ

1.How can I place an order for VOFD343A-X008T through Aetrix?

Please submit a Request for Quotation (RFQ) for VOFD343A-X008T 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 VOFD343A-X008T reliable?

The price and inventory of VOFD343A-X008T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VOFD343A-X008T is usually 5 days.

3.What payment methods are accepted for VOFD343A-X008T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VOFD343A-X008T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for VOFD343A-X008T?

VOFD343A-X008T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your VOFD343A-X008T 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 VOFD343A-X008T?

For technical support, including VOFD343A-X008T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VOFD343A-X008T requirements.

6.How does Aetrix verify that VOFD343A-X008T is sourced from the original manufacturer or authorized distributors?

All VOFD343A-X008T 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 VOFD343A-X008T meets industry standards.

7.What is the process for return or replacement of VOFD343A-X008T?

All VOFD343A-X008T units undergo pre-shipment inspection (PSI). If there is an issue with VOFD343A-X008T, 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 VOFD343A-X008T part is unused and in its original packaging.

Return procedure for VOFD343A-X008T:

1.Submit a request within 90 days.

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

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