EL817(M)(A))-VG Optoisolator Equivalent & Substitute Parts

Part Overview

The EL817(M)(A))-VG is a 5000Vrms optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel 4-DIP component provides galvanic isolation for DC input signals with a maximum output current of 50mA per channel. The part is Active status and RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from qualified alternatives meeting the same electrical and mechanical specifications.

Substiute Parts

EL817(M)(A))-VG

Everlight Electronics Co LtdIn Stock: 1215EL817(M)(A))-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

Substitution eligibility for the EL817(M)(A))-VG is determined by the following mandatory parameters:

• Voltage - Isolation: Minimum 5000Vrms (equal or greater)
• Number of Channels: 1 channel
• Output Type: Transistor
• Voltage - Output (Max): 80V
• Current - Output / Channel: 50mA
• Operating Temperature Range: -55°C ~ 110°C
• Mounting Type: Through Hole
• Package / Case: 4-DIP form factor
• Input Type: DC

All identified substitute parts meet or exceed these core electrical and mechanical requirements. Variations in Current Transfer Ratio, switching times, and saturation voltage are within acceptable ranges for this component category and do not preclude substitution.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and comply with RoHS regulations. Selection among EL817(M)(A))-VG and its substitutes is based on the following criteria:

Toshiba TLP785 Series (TLP785(GR,F), TLP785(BL,F), TLP785(F)): These parts provide equivalent 5000Vrms isolation with improved switching performance (2-3µs rise/fall times versus 6-8µs). The TLP785(GR,F) offers Current Transfer Ratio of 100-300% @ 5mA, providing a balanced profile. TLP785(BL,F) and TLP785(F) exhibit higher Current Transfer Ratio ranges (200-600% and 50-600% respectively), suitable for applications requiring broader gain tolerance. All TLP785 variants feature reduced package dimensions (0.300" versus 0.400").

Vishay VO618A Series (VO618A-4, VO618A-2): These parts provide enhanced isolation voltage (5300Vrms) with faster switching times (2µs rise/fall). VO618A-4 delivers Current Transfer Ratio of 160-320% @ 1mA with lower forward voltage (1.1V). VO618A-2 provides Current Transfer Ratio of 63-125% @ 1mA. Both feature reduced package dimensions (0.300").

All substitute parts are RoHS compliant with MSL 1 rating and support the full operating temperature range of -55°C to 110°C.

Frequently Asked Questions (FAQ)

Q: Can TLP785(GR,F) directly replace EL817(M)(A))-VG in existing PCB layouts?

A: Physical substitution requires PCB layout verification. The TLP785(GR,F) uses a 0.300" (7.62mm) 4-DIP package versus the EL817(M)(A))-VG 0.400" (10.16mm) package. Pin spacing differs; direct socket replacement is not possible without PCB modification or adapter solutions.

Q: What is the significance of Current Transfer Ratio variation among substitutes?

A: Current Transfer Ratio determines the output current relative to input current. The EL817(M)(A))-VG specifies 80-160% @ 5mA. Substitute parts with higher ratios (TLP785(BL,F) at 200-600% @ 5mA) deliver greater output current for equivalent input drive. Applications with fixed input current sources benefit from higher ratios; applications with variable input current require circuit analysis to confirm compatibility.

Q: Are Vishay VO618A parts compatible with Toshiba TLP785 parts in the same application?

A: Both series meet the core isolation voltage, output voltage, and current specifications. However, VO618A parts specify Current Transfer Ratio at 1mA input versus TLP785 at 5mA input. Direct comparison requires normalizing test conditions. Circuit design must account for these measurement differences.

Q: Does the enhanced isolation voltage of VO618A (5300Vrms) provide additional design margin?

A: Yes. The VO618A series provides 300Vrms additional isolation margin above the 5000Vrms requirement. This margin accommodates applications with higher transient voltage stress or extended safety factor requirements.

Q: What packaging considerations apply when selecting substitutes?

A: All substitute parts use 0.300" (7.62mm) 4-DIP packages, smaller than the EL817(M)(A))-VG 0.400" (10.16mm) package. PCB footprint compatibility must be verified. Substitute parts are not pin-compatible drop-in replacements without PCB redesign.

Q: Are all substitute parts available in equivalent quantities?

A: Inventory levels vary. VO618A-4 shows 12,850 pcs availability; TLP785(BL,F) shows 5,999 pcs; TLP785(GR,F) shows 3,099 pcs; TLP785(F) shows 2,332 pcs; VO618A-2 shows 4,394 pcs. Availability should be confirmed for production volume requirements.