VO4254D-X007T Equivalent & Substitute Parts

Part Overview

The VO4254D-X007T is a triac output optoisolator manufactured by Vishay Semiconductor Opto Division, designed for high-voltage isolation applications requiring 5300Vrms isolation voltage. This component features a single-channel triac output in a 6-SMD surface mount package with gull wing leads. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Substitute parts must maintain compatibility across isolation voltage, output type, channel configuration, and surface mount packaging specifications.

Key Parameters

Parameter	VO4254D-X007T
Manufacturer	Vishay Semiconductor Opto Division
Output Type	Triac
Number of Channels	1
Voltage - Isolation	5300Vrms
Voltage - Off State	400 V
Static dV/dt (Min)	5kV/µs
Current - LED Trigger (Ift) (Max)	1.6mA
Current - On State (It (RMS)) (Max)	300 mA
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	60 mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	6-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution logic for the VO4254D-X007T is based on the following critical parameters:

Primary Compatibility Criteria:

Output Type: Triac (mandatory match)
Number of Channels: 1 (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Package / Case: 6-SMD, Gull Wing (mandatory match)
Voltage - Isolation: Minimum 5300Vrms or acceptable lower rating based on application requirements
Voltage - Off State: 400 V or higher
Current - On State (It (RMS)): 300 mA or higher
Current - DC Forward (If): 60 mA or higher
RoHS Status: ROHS3 Compliant (preferred for regulatory alignment)

Substitute Categories:

Category 1: Direct Vishay Equivalent VO4256D-X007T maintains identical isolation voltage (5300Vrms), identical channel count, identical package, and active product status. This part represents the primary direct replacement with improved off-state voltage (600 V vs. 400 V).

Category 2: Lower Isolation Voltage Alternatives MOC3020SM, MOC3020SR2M, MOC3021SM, MOC3021SR2M, MOC3022SM, MOC3022SR2M, MOC3023SM, and MOC3023SR2M all feature 4170Vrms isolation voltage, which is lower than the original 5300Vrms specification. These parts are suitable only for applications where 4170Vrms isolation meets design requirements. All maintain triac output, single-channel configuration, 6-SMD gull wing packaging, and surface mount mounting. These alternatives differ in LED trigger current specifications (ranging from 5mA to 30mA) and packaging formats.

Parameter Comparison

Parameter	VO4254D-X007T	VO4256D-X007T	MOC3020SM	MOC3020SR2M	MOC3021SM	MOC3021SR2M	MOC3022SM	MOC3022SR2M	MOC3023SM	MOC3023SR2M
Manufacturer	Vishay	Vishay	Fairchild	onsemi	Fairchild	onsemi	onsemi	onsemi	onsemi	onsemi
Output Type	Triac	Triac	Triac	Triac	Triac	Triac	Triac	Triac	Triac	Triac
Number of Channels	1	1	1	1	1	1	1	1	1	1
Voltage - Isolation	5300Vrms	5300Vrms	4170Vrms	4170Vrms	4170Vrms	4170Vrms	4170Vrms	4170Vrms	4170Vrms	4170Vrms
Voltage - Off State	400 V	600 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V	400 V
Static dV/dt (Min)	5kV/µs	5kV/µs	—	—	—	—	—	—	—	—
Current - LED Trigger (Ift) (Max)	1.6mA	1.6mA	30mA	30mA	15mA	15mA	10mA	10mA	5mA	5mA
Current - On State (It (RMS)) (Max)	300 mA	300 mA	300 mA	300 mA	300 mA	300 mA	300 mA	300 mA	300 mA	300 mA
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.15V	1.15V	1.15V	1.15V	1.15V	1.15V	1.15V	1.15V
Current - DC Forward (If) (Max)	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing	6-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: VO4256D-X007T

VO4256D-X007T is the preferred direct substitute for VO4254D-X007T. Both parts maintain identical isolation voltage (5300Vrms), identical LED trigger current specification (1.6mA maximum), identical on-state current rating (300 mA), and identical package configuration. VO4256D-X007T carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. The higher off-state voltage (600 V vs. 400 V) provides additional design margin. This part is suitable for direct board-level replacement without circuit modification.

Secondary Recommendations: MOC302x Series (4170Vrms Isolation)

The MOC3020SM, MOC3020SR2M, MOC3021SM, MOC3021SR2M, MOC3022SM, MOC3022SR2M, MOC3023SM, and MOC3023SR2M parts are suitable substitutes only when application isolation requirements are 4170Vrms or lower. All MOC302x variants maintain triac output, single-channel configuration, 6-SMD gull wing packaging, and surface mount mounting. These parts are available in active product status with ROHS3 compliance (onsemi variants) or active status (Fairchild variants). Selection among MOC302x variants depends on LED trigger current requirements: MOC3020 series (30mA), MOC3021 series (15mA), MOC3022 series (10mA), and MOC3023 series (5mA). Packaging format availability varies by manufacturer and variant.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance or equivalent regulatory status. VO4256D-X007T and onsemi MOC302x variants explicitly list ROHS3 compliance. Operating temperature range differs between VO4254D-X007T (-55°C to 100°C) and MOC302x alternatives (-40°C to 85°C); applications requiring extended low-temperature operation must use VO4256D-X007T.

Frequently Asked Questions (FAQ)

Q: Can MOC302x series parts directly replace VO4254D-X007T?

A: MOC302x parts are compatible only if your application isolation voltage requirement is 4170Vrms or lower. The VO4254D-X007T specifies 5300Vrms isolation. If your design requires 5300Vrms isolation, use VO4256D-X007T instead. If your application was originally designed for 5300Vrms isolation, MOC302x substitution requires design review to confirm 4170Vrms isolation is acceptable.

Q: What is the difference between VO4254D-X007T and VO4256D-X007T?

A: Both parts share identical isolation voltage (5300Vrms), LED trigger current (1.6mA), on-state current (300 mA), and package configuration. The primary difference is off-state voltage: VO4254D-X007T specifies 400 V while VO4256D-X007T specifies 600 V. VO4256D-X007T is active product status while VO4254D-X007T is obsolete. VO4256D-X007T is the direct replacement.

Q: Why do MOC302x parts have different LED trigger current specifications?

A: MOC3020, MOC3021, MOC3022, and MOC3023 represent different variants within the MOC302 base product family, each optimized for different input current requirements. MOC3020 (30mA) is for higher input current applications, MOC3021 (15mA) for medium input current, MOC3022 (10mA) for lower input current, and MOC3023 (5mA) for minimum input current applications. Selection depends on your input circuit design and available drive current.

Q: Are packaging format differences between MOC302x variants significant?

A: Packaging format (Bulk, Tape & Reel, Cut Tape, Tube) affects supply chain logistics and handling but does not affect electrical performance or board-level compatibility. All MOC302x variants use identical 6-SMD gull wing package geometry. Select packaging format based on your procurement and assembly requirements.

Q: What is the impact of operating temperature range differences?

A: VO4254D-X007T and VO4256D-X007T specify -55°C to 100°C operating range, while MOC302x parts specify -40°C to 85°C. If your application requires operation below -40°C or above 85°C, MOC302x substitution is not suitable. Use VO4256D-X007T for extended temperature range requirements.

Q: Can I use MOC3023SR2M instead of MOC3020SR2M?

A: Yes, MOC3023SR2M is compatible with MOC3020SR2M at the board level. Both use identical 6-SMD gull wing packaging and triac output configuration. The difference is LED trigger current: MOC3023SR2M requires 5mA maximum while MOC3020SR2M requires 30mA maximum. MOC3023SR2M is suitable if your input circuit can provide only 5mA drive current. If your circuit provides 30mA drive current, either part functions correctly, but MOC3023SR2M operates with lower input power dissipation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message