EL817-G Optoisolator Equivalent & Substitute Parts

Part Overview

The EL817-G is an optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides galvanic isolation up to 5000Vrms with a single channel configuration in a 4-DIP through-hole package. The part is currently active in production with 60400 units in stock inventory.

Equivalent and substitute parts are identified based on matching electrical isolation ratings, output characteristics, package form factor, and operational temperature ranges. Substitute components must maintain compatibility with the same mounting type and pin configuration while meeting or exceeding the isolation voltage and output current specifications.

Substiute Parts

EL817-G

Everlight Electronics Co LtdIn Stock: 60472EL817-G Datasheet

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VO618A-2

Vishay Semiconductor Opto DivisionIn Stock: 4441VO618A-2 Datasheet

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VO618A-4

Vishay Semiconductor Opto DivisionIn Stock: 12873VO618A-4 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the EL817-G are identified based on the following substitution criteria:

Mandatory Matching Parameters:

• Package / Case: 4-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Number of Channels: 1
• Output Type: Transistor
• Voltage - Output (Max): 80V
• Current - Output / Channel: 50mA
• Operating Temperature: -55°C ~ 110°C
• Input Type: DC

Allowable Parameter Variations:

• Voltage - Isolation: Equal to or greater than 5000Vrms
• Current Transfer Ratio: May vary within manufacturer specifications
• Vce Saturation: May vary within manufacturer specifications
• Rise / Fall Time: May vary within manufacturer specifications
• Voltage - Forward (Vf): May vary within manufacturer specifications

The substitute parts VO618A-2 and VO618A-4 from Vishay Semiconductor Opto Division meet all mandatory matching parameters and exceed the isolation voltage requirement at 5300Vrms. Both parts maintain identical package configuration, mounting type, channel count, output voltage and current ratings, and operating temperature range as the EL817-G.

Parameter Comparison

Engineering Selection Recommendations

EL817-G (Primary Part): The EL817-G remains the primary component choice when specified in original designs. This part is actively manufactured by Everlight Electronics Co Ltd with substantial inventory availability (60400 units). The component is ROHS3 compliant and carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints.

VO618A-2 (Substitute Option): The VO618A-2 from Vishay Semiconductor Opto Division is a direct substitute meeting all mandatory electrical and mechanical parameters. This part provides 5300Vrms isolation, exceeding the EL817-G specification by 300Vrms. The VO618A-2 is ROHS3 compliant with REACH Unaffected status. Inventory availability is 4394 units. This variant is suitable for applications where the lower current transfer ratio range (63% to 125% @ 1mA) is acceptable.

VO618A-4 (Substitute Option): The VO618A-4 from Vishay Semiconductor Opto Division is a direct substitute with identical package, mounting, and output specifications as the EL817-G. This part provides 5300Vrms isolation and features a higher current transfer ratio range (160% to 320% @ 1mA), making it suitable for applications requiring enhanced optical coupling efficiency. The VO618A-4 is ROHS3 compliant with REACH Unaffected status. Inventory availability is 12850 units.

All three parts share identical operating temperature ranges (-55°C ~ 110°C), output voltage ratings (80V maximum), and output current capacity (50mA per channel). Selection between VO618A-2 and VO618A-4 depends on the specific current transfer ratio requirements of the application circuit.

Frequently Asked Questions (FAQ)

Q: Can VO618A-2 and VO618A-4 be used interchangeably with EL817-G?

A: Yes, both Vishay parts are direct substitutes for the EL817-G in applications where the 4-DIP through-hole package and specified electrical parameters are required. All three parts share identical package dimensions, pin configurations, output voltage and current ratings, and operating temperature ranges. The primary differences are in current transfer ratio specifications and isolation voltage (both Vishay parts exceed the EL817-G isolation rating).

Q: What is the difference between VO618A-2 and VO618A-4?

A: Both parts are identical except for current transfer ratio specifications. The VO618A-2 provides 63% to 125% current transfer ratio at 1mA input current, while the VO618A-4 provides 160% to 320% at 1mA. The VO618A-4 offers higher optical coupling efficiency. Selection depends on circuit design requirements for input-to-output current transfer characteristics.

Q: Are all three parts RoHS compliant?

A: Yes, the EL817-G, VO618A-2, and VO618A-4 are all ROHS3 compliant. The Vishay parts additionally carry REACH Unaffected status.

Q: What is the isolation voltage difference between EL817-G and the Vishay substitutes?

A: The EL817-G provides 5000Vrms isolation, while both VO618A-2 and VO618A-4 provide 5300Vrms isolation. The Vishay parts exceed the EL817-G specification by 300Vrms, providing additional isolation margin in high-voltage applications.

Q: Can these parts be used in surface-mount applications?

A: No, all three parts are through-hole mounted components in 4-DIP package configuration. They are not suitable for surface-mount assembly processes.

Q: What is the moisture sensitivity level for these parts?

A: The EL817-G carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints. The Vishay parts do not specify MSL ratings in the provided data.

Q: Are there any differences in turn-on/turn-off timing between these parts?

A: Yes, the EL817-G does not specify turn-on/turn-off times. The VO618A-2 and VO618A-4 both specify 3µs turn-on time and 2.3µs turn-off time. Additionally, the Vishay parts feature faster rise/fall times (2µs each) compared to the EL817-G (6µs rise, 8µs fall).

Q: What is the Vce saturation difference?

A: The EL817-G specifies a maximum Vce saturation of 200mV, while both Vishay substitutes specify 400mV maximum. This difference may affect circuit performance in applications sensitive to output saturation voltage characteristics.