VO4258M Optoisolator Equivalent & Substitute Parts

Part Overview

The VO4258M is an optoisolator with triac output manufactured by Vishay Semiconductor Opto Division. This component provides galvanic isolation up to 5300Vrms with a single triac output channel in a 6-DIP through-hole package. The device is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified when design requirements permit operation within specified electrical and mechanical parameter tolerances, or when supply chain considerations necessitate alternative sourcing from qualified manufacturers.

Key Parameters

Parameter	VO4258M
Manufacturer	Vishay Semiconductor Opto Division
Category	Optoisolators
Output Type	Triac
Number of Channels	1
Voltage - Isolation	5300Vrms
Voltage - Off State	800 V
Static dV/dt (Min)	5kV/µs
Current - LED Trigger (Ift) (Max)	3mA
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
Package / Case	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the VO4258M are qualified based on the following criteria:

Electrical Compatibility Parameters:

Output type must be triac
Single channel configuration
Isolation voltage minimum 5000Vrms (VO4258M specifies 5300Vrms)
Off-state voltage rating of 800V
Operating temperature range -55°C to 100°C
Forward voltage and LED trigger current within acceptable design margins

Mechanical Compatibility Parameters:

Package type: 6-DIP (0.300", 7.62mm)
Through-hole mounting
Pin configuration compatibility

Compliance Parameters:

ROHS3 compliant
Active product status

The substitute parts FOD4208 and FOD4218 (both manufactured by onsemi) meet these criteria with isolation voltage of 5000Vrms, matching package configuration, and equivalent operating temperature range.

Parameter Comparison

Parameter	VO4258M	FOD4208	FOD4218
Manufacturer	Vishay	onsemi	onsemi
Output Type	Triac	Triac	Triac
Number of Channels	1	1	1
Voltage - Isolation	5300Vrms	5000Vrms	5000Vrms
Voltage - Off State	800 V	800 V	800 V
Static dV/dt (Min)	5kV/µs	10kV/µs	10kV/µs
Current - LED Trigger (Ift) (Max)	3mA	2mA	1.3mA
Current - Hold (Ih)	Not specified	500µA	500µA
Turn On Time	Not specified	60µs	60µs
Voltage - Forward (Vf) (Typ)	1.2V	1.28V	1.28V
Current - DC Forward (If) (Max)	60 mA	30 mA	30 mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)	6-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

VO4258M (Vishay): Primary component with 5300Vrms isolation rating. Active product status with ROHS3 compliance. Approved by BSI, cUR, FIMKO, and UR agencies.

FOD4208 (onsemi): Substitute part with 5000Vrms isolation rating. Active product status with ROHS3 compliance. Approved by cUL, FIMKO, and UL agencies. Lower LED trigger current (2mA maximum) and higher static dV/dt rating (10kV/µs) compared to VO4258M.

FOD4218 (onsemi): Substitute part with 5000Vrms isolation rating. Active product status with ROHS3 compliance. Approved by cUL, FIMKO, and UL agencies. Lowest LED trigger current (1.3mA maximum) and higher static dV/dt rating (10kV/µs) compared to VO4258M.

All three parts share identical package configuration, mounting type, operating temperature range, and off-state voltage rating. Selection between these parts depends on circuit requirements for isolation voltage margin, LED trigger current specifications, and approval agency requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can FOD4208 or FOD4218 be used as direct replacements for VO4258M?

A: Both FOD4208 and FOD4218 are mechanically and functionally compatible substitutes. They share the same 6-DIP package, through-hole mounting configuration, and operating temperature range. The primary electrical difference is the isolation voltage rating: VO4258M provides 5300Vrms while FOD4208 and FOD4218 provide 5000Vrms. Substitution is valid when circuit design permits operation at 5000Vrms isolation.

Q: What are the key differences between FOD4208 and FOD4218?

A: Both parts are manufactured by onsemi with identical isolation voltage (5000Vrms), package type, and operating temperature range. The primary difference is the LED trigger current specification: FOD4208 has a maximum of 2mA while FOD4218 has a maximum of 1.3mA. Both have identical hold current (500µA) and turn-on time (60µs) specifications.

Q: Are there compliance or certification differences between these parts?

A: VO4258M is approved by BSI, cUR, FIMKO, and UR. FOD4208 and FOD4218 are approved by cUL, FIMKO, and UL. Application requirements may dictate which approval agencies are necessary for the target market or end-use application.

Q: What is the significance of the static dV/dt rating difference?

A: VO4258M specifies a minimum static dV/dt of 5kV/µs, while FOD4208 and FOD4218 specify 10kV/µs. This parameter indicates the rate of voltage change the triac output can withstand without false triggering. The higher rating in the onsemi parts provides greater noise immunity in high dV/dt environments.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All three parts use identical 6-DIP (0.300", 7.62mm) package dimensions and through-hole mounting. Pin-to-pin compatibility is maintained, allowing direct substitution on existing printed circuit boards without layout modifications.

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