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Vishay Semiconductor Opto Division VO4256D
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- Part No.:
- VO4256D
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Triac, SCR Output Optoisolators
- Package:
- 6-DIP (0.300", 7.62mm)
- Datasheet:
-
VO4256D.pdf
- Description:
- OPTOISOLATOR 5.3KV TRIAC 6DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,426
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Product details
Overview
VO4256D from Vishay Semiconductors is a phototriac-output optocoupler in DIP-6 package, designed for AC load switching with 600 V blocking voltage, 300 mA on-state current, and 1.6 mA LED trigger current (bin D). It isolates microcontroller GPIOs from 120–380 VAC lines to drive relays, motors, and solid-state relays in industrial controls.
For engineers reviewing the VO4256D datasheet, VO4256D pinout, VO4256D application, or VO4256D equivalent, key selection criteria include dV/dt immunity (>5 kV/μs), safety-rated isolation (4420 VRMS), input sensitivity, and non-zero-crossing TRIAC output behavior for precise phase-angle control.
Technical Context
The VO4256D integrates a GaAs infrared LED optically coupled to a photosensitive non-zero-crossing TRIAC die. Its proprietary dV/dt clamp enables static dV/dt immunity exceeding 5 kV/μs-critical for noisy industrial AC environments.
Triggering relies on an emitter-follower phototransistor cascaded with an SCR predriver, achieving low IFT of 1.6 mA at 25 °C. The output stage lacks zero-crossing detection, enabling full-wave phase control and dimming applications without timing latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM | 600 V - Sustains peak off-state voltage across 240 VAC and 380 VAC mains without false triggering. |
| IFT | 1.6 mA max - Minimum LED current required to latch TRIAC output; enables direct drive from low-power MCU GPIOs. |
| IT(M) | 300 mA RMS - Supports resistive/inductive loads up to ~72 W at 240 VAC without external heat sinking. |
| dV/dtcr | 5000 V/μs - Immune to rapid voltage transients common in motor drives and solenoid switching. |
| VISO | 4420 VRMS - UL 1577-certified reinforced insulation for safe separation between logic and AC power domains. |
| CIO | 0.8 pF - Ultra-low input-to-output capacitance minimizes noise coupling and improves EMC performance. |
| TAMB | −55 °C to +100 °C - Rated for operation in harsh industrial enclosures and uncooled appliance environments. |
Pinout & Package
DIP-6 package (7.62 mm lead pitch, 8.60 mm body width) with internal creepage ≥7 mm and DTI ≥0.4 mm per DIN EN 60747-5-5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A) | Anode of IR LED | Positive input for triggering LED; requires series resistor to limit IF ≤60 mA. |
| 2 (C) | Cathode of IR LED | LED return path; connects to MCU ground or low-side switch. |
| 3 (NC) | No Connect | Internally unconnected; must remain floating-no PCB trace or soldering. |
| 4 (MT1) | Main Terminal 1 of TRIAC | AC line-side terminal; connects to one side of load or AC source. |
| 5 (MT2) | Main Terminal 2 of TRIAC | AC load-side terminal; completes AC current path through controlled device. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating-no PCB trace or soldering. |
Key Features
| Feature | Design Value |
|---|---|
| Non-zero-crossing TRIAC output | Enables phase-angle control for dimming and soft-start-no 8.3/10 ms delay inherent to zero-crossing devices. |
| High dV/dt immunity | 5 kV/μs static rating prevents false turn-on during EMI events in motor control or relay coil de-energization. |
| Low IFT bin D | 1.6 mA max trigger current reduces drive circuit power loss and simplifies interface with 3.3 V or 5 V logic. |
| Reinforced safety isolation | 4420 VRMS withstand voltage certified to UL 1577 and DIN EN 60747-5-5 (option 1 available). |
| DIP-6 creepage & clearance | ≥7 mm creepage/clearance meets IEC 60664-1 Pollution Degree 2 requirements for industrial PCB layouts. |
Applications
| Solid-State Relay (SSR) | Industrial Motor Control |
|---|---|
|
Use Scenario: Replacing electromechanical relays in PLC output modules for 240 VAC pump control. IC Role / Device Role / Timing Role: Isolated TRIAC driver that switches AC power to induction motor windings without contact wear. Use Value: Eliminates mechanical bounce and arcing; supports >107 cycles versus <105 for EM relays under same load. |
Use Scenario: Phase-controlled speed regulation of universal motors in factory automation conveyors. IC Role / Device Role / Timing Role: Non-zero-crossing AC switch enabling precise firing angle adjustment via PWM-modulated LED drive. Use Value: Delivers smooth torque response down to 10% speed without audible buzz or torque ripple. |
| Smart Appliance Power Control | Office Equipment Load Switching |
|
Use Scenario: Mains-powered coffee maker with programmable brew temperature and hold time. IC Role / Device Role / Timing Role: Isolated AC switch controlling heating element power using microcontroller-generated phase-cut waveforms. Use Value: Enables accurate thermal ramping (±2 °C) and energy-efficient standby by cutting power at optimal phase angles. |
Use Scenario: Automatic paper jam detection and heater shutdown in laser printers. IC Role / Device Role / Timing Role: Safety-isolated switch disconnecting fuser heater (240 VAC, 10 A) upon thermal fault signal. Use Value: Meets IEC 62368-1 reinforced insulation requirements while responding within <500 μs to fault inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar phototriac switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IL420 | 400 V VDRM, 100 mA IT(M), 5 mA IFT, DIP-6 | Limited to 120 VAC resistive loads; insufficient for 240/380 VAC motor control. | Select IL420 only for cost-sensitive 120 VAC appliances where dV/dt immunity and high current are not required. |
| VO4256H | Same package and VDRM/IT(M), but 2 mA IFT (higher trigger threshold) | Requires stronger LED drive; less suitable for ultra-low-power battery-operated controllers. | Choose VO4256H when system-level noise margin justifies higher IFT to reduce false-trigger risk in high-EMI zones. |
Compared with IL420 and VO4256H, the VO4256D delivers optimal balance of low drive strength (1.6 mA), high 600 V blocking, and 300 mA load current-making it the preferred choice for new 240 VAC industrial and appliance designs requiring robust phase-control capability.
Availability
VO4256D is available at Aetrix Electronics and suitable for solid-state relays, industrial motor controls, and smart appliance power management requiring stable component supply, long-lifecycle support, and UL/VDE-certified isolation.
Supply support for VO4256D 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 reliability and high-voltage isolation.
The VO4256D belongs to Vishay's high-dV/dt phototriac family engineered for noise-immune AC power switching in industrial automation, home appliances, and office equipment where zero-crossing latency is unacceptable.
FAQ
What is the maximum AC voltage the VO4256D can safely switch?
The VO4256D has a repetitive peak off-state voltage (VDRM) of 600 V, enabling reliable switching of 120 VAC, 240 VAC, and 380 VAC mains. Its 5 kV/μs dV/dt rating ensures immunity to voltage spikes during inductive load switching, making VO4256D suitable for direct connection to industrial AC lines without additional snubbers in most cases.
Does the VO4256D provide zero-crossing detection?
No, the VO4256D uses a non-zero-crossing TRIAC output. This allows immediate turn-on at any point in the AC waveform-essential for phase-angle control, dimming, and soft-start applications. Unlike zero-crossing optocouplers, VO4256D does not wait for voltage zero crossings, eliminating timing latency and enabling precise power regulation.
What is the minimum LED forward current needed to trigger the VO4256D?
The VO4256D (bin D) requires a maximum LED trigger current (IFT) of 1.6 mA at 25 °C to reliably latch the output TRIAC. This low threshold allows direct drive from standard MCU GPIOs with a simple current-limiting resistor-no external transistor buffer is needed for most 3.3 V or 5 V logic systems.
Is the VO4256D certified for safety isolation standards?
Yes, the VO4256D is UL 1577 certified (4420 VRMS isolation voltage) and complies with DIN EN 60747-5-5 (VDE 0884-5) when ordered with option 1. Its ≥7 mm creepage and ≥0.4 mm insulation thickness meet reinforced insulation requirements for industrial and consumer equipment per IEC 62368-1 and IEC 61000-4-5.
Can the VO4256D drive inductive loads like solenoids or contactor coils?
Yes, the VO4256D is explicitly rated for inductive loads including solenoids, motor windings, and thyristor gate drivers. Its non-zero-crossing architecture avoids turn-off at current zero, preventing voltage overshoot. With 300 mA RMS on-state current and 600 V blocking, VO4256D handles typical 24 VDC or 120/240 VAC solenoid drivers without external protection in most cases.
VO4256D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- -
- Package/Case:
- 6-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Triac
- Zero Crossing Circuit:
- No
- Number of Channels:
- 1
- Voltage - Isolation:
- 5300Vrms
- Voltage - Off State:
- 600 V
- Static dV/dt (Min):
- 5kV/µs
- Current - LED Trigger (Ift) (Max):
- 1.6mA
- Current - On State (It (RMS)) (Max):
- 300 mA
- Current - Hold (Ih):
- -
- Turn On Time:
- -
- Voltage - Forward (Vf) (Typ):
- 1.2V
- Current - DC Forward (If) (Max):
- 60 mA
- Operating Temperature:
- -55°C ~ 100°C
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 6-DIP
- Approval Agency:
- cUR, FIMKO, UR
VO4256D FAQ
1.How can I place an order for VO4256D through Aetrix?
Please submit a Request for Quotation (RFQ) for VO4256D 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 VO4256D reliable?
The price and inventory of VO4256D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VO4256D is usually 5 days.
3.What payment methods are accepted for VO4256D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VO4256D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VO4256D?
VO4256D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VO4256D 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 VO4256D?
For technical support, including VO4256D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VO4256D requirements.
6.How does Aetrix verify that VO4256D is sourced from the original manufacturer or authorized distributors?
All VO4256D 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 VO4256D meets industry standards.
7.What is the process for return or replacement of VO4256D?
All VO4256D units undergo pre-shipment inspection (PSI). If there is an issue with VO4256D, 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 VO4256D part is unused and in its original packaging.
Return procedure for VO4256D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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