EL817(M)-VG Optoisolator Equivalent & Substitute Parts

Part Overview

The EL817(M)-VG is a 5000Vrms isolation optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel 4-DIP component is designed for DC input applications requiring high-voltage isolation in through-hole mounting configurations. The part is currently active in production with 767 units in stock. Alternative equivalent parts are necessary to address supply availability, lead time requirements, or specific performance parameter needs within the optoisolator category.

Substiute Parts

EL817(M)-VG

Everlight Electronics Co LtdIn Stock: 860EL817(M)-VG Datasheet

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TLP785(BL,F)

Toshiba Semiconductor and StorageIn Stock: 6014TLP785(BL,F) Datasheet

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TLP785(F)

Toshiba Semiconductor and StorageIn Stock: 2426TLP785(F) Datasheet

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TLP785(GR,F)

Toshiba Semiconductor and StorageIn Stock: 3126TLP785(GR,F) 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(M)-VG optoisolator are qualified based on the following critical parameters that determine functional equivalence:

Primary Equivalence Criteria:

• Single-channel configuration (Number of Channels = 1)
• Isolation voltage rating of 5000Vrms or higher
• Transistor output type
• 4-DIP through-hole package format
• DC input type
• Maximum output voltage of 80V
• Maximum output current of 50mA per channel
• Operating temperature range of -55°C to 110°C
• Active product status

Secondary Compatibility Factors:

• Current Transfer Ratio (CTR) performance bands
• Rise and fall time characteristics
• Forward voltage (Vf) specifications
• Vce saturation voltage
• RoHS and regulatory compliance status

The substitute parts listed below meet all primary equivalence criteria. Variations in Current Transfer Ratio, timing characteristics, and saturation voltage are within acceptable ranges for this optoisolator category and do not prevent functional substitution in standard isolation applications.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain active product status and meet regulatory compliance requirements. Selection among equivalent parts should be based on the following factors:

Toshiba TLP785 Series (TLP785(BL,F), TLP785(F), TLP785(GR,F)): These parts are manufactured by Toshiba Semiconductor and Storage and provide 5000Vrms isolation matching the EL817(M)-VG specification. The TLP785 series offers faster switching characteristics (2µs rise/fall time versus 6µs/8µs for the EL817(M)-VG) and lower forward voltage (1.15V typical). All three variants are ROHS3 compliant or RoHS compliant. The TLP785(BL,F) variant provides higher minimum CTR (200% @ 5mA), while TLP785(F) matches the EL817(M)-VG minimum CTR specification (50% @ 5mA). TLP785(GR,F) offers a narrower CTR range (100-300% @ 5mA). All TLP785 variants use a smaller 4-DIP package (0.300", 7.62mm) compared to the EL817(M)-VG (0.400", 10.16mm).

Vishay VO618A Series (VO618A-2, VO618A-4): These parts are manufactured by Vishay Semiconductor Opto Division and provide higher isolation voltage (5300Vrms) than the EL817(M)-VG specification. Both variants are ROHS3 compliant and REACH unaffected. The VO618A-2 provides lower CTR (63-125% @ 1mA test current), while VO618A-4 provides higher CTR (160-320% @ 1mA test current). Both offer faster switching (2µs rise/fall time) and lower forward voltage (1.1V typical). The VO618A series uses a smaller 4-DIP package (0.300", 7.62mm). VO618A-4 has significantly higher inventory availability (12,850 units).

Package Consideration: All substitute parts use a smaller 4-DIP package footprint (0.300", 7.62mm) compared to the EL817(M)-VG (0.400", 10.16mm). PCB layout compatibility must be verified before selection.

Frequently Asked Questions (FAQ)

Q: Can TLP785(BL,F), TLP785(F), and TLP785(GR,F) be used interchangeably with EL817(M)-VG?

A: Yes, all three TLP785 variants are functionally equivalent to the EL817(M)-VG for applications requiring 5000Vrms isolation, single-channel transistor output, and 4-DIP through-hole mounting. The variants differ in Current Transfer Ratio performance bands. TLP785(F) matches the EL817(M)-VG minimum CTR specification (50% @ 5mA), making it the closest electrical match. TLP785(BL,F) provides higher minimum CTR (200% @ 5mA) for applications requiring higher gain. TLP785(GR,F) offers a narrower CTR range (100-300% @ 5mA). All three are ROHS3 or RoHS compliant.

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

A: Both VO618A-2 and VO618A-4 are Vishay optoisolators with 5300Vrms isolation and identical electrical characteristics except for Current Transfer Ratio. VO618A-2 provides 63-125% CTR @ 1mA, while VO618A-4 provides 160-320% CTR @ 1mA. Selection depends on the required gain for your application. VO618A-4 has higher inventory availability (12,850 units versus 4,394 units for VO618A-2).

Q: Are there package compatibility issues when substituting for EL817(M)-VG?

A: Yes. The EL817(M)-VG uses a larger 4-DIP package (0.400", 10.16mm), while all substitute parts use a smaller 4-DIP package (0.300", 7.62mm). PCB footprint and lead spacing must be verified for compatibility. The smaller package may require PCB layout modifications or use of adapter solutions if the original design was optimized for the larger package.

Q: Which substitute part has the fastest switching speed?

A: The Vishay VO618A-2 and VO618A-4 parts offer the fastest switching characteristics with 2µs rise time and 2µs fall time. The Toshiba TLP785 series provides 2µs rise time and 3µs fall time. The EL817(M)-VG has the slowest switching with 6µs rise time and 8µs fall time. For applications requiring fast switching, VO618A or TLP785 series are preferred.

Q: What is the isolation voltage difference between EL817(M)-VG and VO618A series?

A: The EL817(M)-VG provides 5000Vrms isolation, while the VO618A-2 and VO618A-4 provide 5300Vrms isolation. The VO618A series offers 6% higher isolation voltage, which is beneficial for applications requiring maximum isolation margin. Both ratings exceed standard 5000Vrms isolation requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. The EL817(M)-VG is ROHS3 compliant. TLP785(BL,F) and TLP785(GR,F) are RoHS compliant. TLP785(F), VO618A-2, and VO618A-4 are ROHS3 compliant. All parts meet RoHS regulatory requirements. VO618A-2 and VO618A-4 are additionally REACH unaffected.

Q: Which substitute part has the highest inventory availability?

A: VO618A-4 has the highest inventory with 12,850 units in stock, followed by TLP785(BL,F) with 5,999 units. The EL817(M)-VG has 767 units in stock. For applications requiring immediate availability or bulk quantities, VO618A-4 is the preferred choice.

Q: Can I use a substitute part with higher CTR minimum specification?

A: Yes. If your application can tolerate higher Current Transfer Ratio, parts with higher minimum CTR (such as TLP785(BL,F) with 200% minimum CTR or VO618A-4 with 160% minimum CTR) can be used. Higher CTR provides greater optical coupling efficiency and may improve circuit performance. However, verify that your circuit design does not depend on the lower CTR characteristics of the EL817(M)-VG.

Q: What is the significance of the test current difference (5mA for EL817(M)-VG and TLP785 versus 1mA for VO618A)?

A: Current Transfer Ratio is measured at different input LED currents for different part families. The EL817(M)-VG and TLP785 series specify CTR at 5mA input current, while VO618A series specifies CTR at 1mA input current. These are not directly comparable values. When selecting a substitute, ensure your circuit design accommodates the CTR specification and test current of the chosen part.