VO3526 Optoisolator Triac - Equivalent & Substitute Parts

Part Overview

The VO3526 is a power output optoisolator with triac switching capability, rated for 5300Vrms isolation voltage and 600V off-state voltage. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The VO3526 operates as a 1-channel optoisolator in a 10-DIP package configuration with through-hole mounting.

Substiute Parts

VO3526

Vishay Semiconductor Opto DivisionIn Stock: 1153VO3526 Datasheet

Current PartRFQ

VO2223B

Vishay Semiconductor Opto DivisionIn Stock: 2778VO2223B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the VO3526 is determined by the following critical parameters: output type (triac power), number of channels (1), voltage ratings (isolation and off-state), current specifications (on-state, trigger, and hold), forward voltage characteristics, operating temperature range, mounting type (through-hole), and regulatory compliance certifications.

The VO2223B qualifies as a substitute based on matching the following core criteria:

• Output Type: Triac, Power
• Number of Channels: 1
• Voltage - Off State: 600V (identical)
• Current - On State (It (RMS)) (Max): 1A (identical)
• Current - LED Trigger (Ift) (Max): 10mA (identical)
• Current - Hold (Ih): 25mA (identical)
• Voltage - Forward (Vf) (Typ): 1.4V (Max) (identical)
• Current - DC Forward (If) (Max): 50mA (identical)
• Operating Temperature Range: -40°C to 85°C (identical)
• Mounting Type: Through Hole (identical)
• RoHS Status: ROHS3 Compliant (identical)

The VO2223B differs in isolation voltage (4470Vrms versus 5300Vrms) and static dV/dt rating (600V/µs versus 210V/µs), representing a trade-off in isolation capability for improved transient response characteristics.

Parameter Comparison

Engineering Selection Recommendations

The VO2223B is the manufacturer-recommended substitute for the obsolete VO3526. Both components maintain identical electrical performance across trigger current, on-state current, hold current, forward voltage, and operating temperature specifications. Both achieve ROHS3 compliance and are manufactured by Vishay Semiconductor Opto Division.

The primary design consideration is the isolation voltage differential: the VO2223B provides 4470Vrms isolation compared to the VO3526's 5300Vrms. Applications requiring the full 5300Vrms isolation specification cannot use the VO2223B as a direct substitute. The VO2223B offers superior static dV/dt performance at 600V/µs, providing enhanced transient immunity compared to the VO3526's 210V/µs rating.

Package configuration differs between the two parts: the VO3526 uses a 10-DIP format with 10 leads, while the VO2223B uses an 8-DIP format with 7 leads. PCB layout and footprint modifications are required for implementation of the VO2223B.

The VO2223B's active product status ensures ongoing availability and manufacturing support, whereas the VO3526 is obsolete and subject to supply discontinuation.

Frequently Asked Questions (FAQ)

Q: Can the VO2223B directly replace the VO3526 without circuit modifications?

A: The VO2223B matches all critical electrical parameters (trigger current, on-state current, hold current, forward voltage, and operating temperature) with the VO3526. However, the reduced isolation voltage (4470Vrms versus 5300Vrms) and different package configuration (8-DIP versus 10-DIP) require circuit evaluation and PCB layout redesign. Applications with isolation voltage requirements below 4470Vrms can proceed with substitution after footprint verification.

Q: What is the significance of the static dV/dt difference between these parts?

A: The VO2223B's 600V/µs static dV/dt rating is superior to the VO3526's 210V/µs rating. This parameter defines the maximum rate of voltage change the triac output can withstand without false triggering. The VO2223B provides better transient immunity in applications with fast-switching AC loads.

Q: Are both parts RoHS compliant?

A: Yes, both the VO3526 and VO2223B are ROHS3 compliant, meeting current environmental and hazardous substance restrictions.

Q: Why does the VO2223B have fewer pins than the VO3526?

A: The VO2223B uses an 8-DIP package with 7 leads, while the VO3526 uses a 10-DIP package with 10 leads. The functional differences do not require additional pins; the package size reduction reflects modern component design. Pin mapping must be verified during circuit redesign to ensure correct signal routing.

Q: Is the VO2223B suitable for all applications currently using the VO3526?

A: The VO2223B is suitable for applications where the isolation voltage requirement does not exceed 4470Vrms. Applications requiring the full 5300Vrms isolation specification of the VO3526 must identify alternative components with equivalent or higher isolation ratings. The VO2223B's active product status makes it the preferred choice for new designs and legacy system support where isolation voltage permits.