VOS615AT Optoisolator Equivalent & Substitute Parts

Part Overview

The VOS615AT is an active optoisolator manufactured by Vishay Semiconductor Opto Division, designed for high-voltage isolation applications. This single-channel transistor output optoisolator provides 3750Vrms isolation with a 4-SSOP surface mount package. The device is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the primary VOS615AT is unavailable due to inventory constraints, supply chain disruptions, or when alternative packaging formats are required for specific manufacturing processes. The EL3H7 series from Everlight Electronics Co Ltd provides functionally equivalent alternatives that maintain the same isolation voltage, output type, and package footprint while offering different current transfer ratio grades and packaging options.

Substiute Parts

VOS615AT

Vishay Semiconductor Opto DivisionIn Stock: 89908VOS615AT Datasheet

Current PartRFQ

EL3H7(A)(EA)-G

Everlight Electronics Co LtdIn Stock: 2858EL3H7(A)(EA)-G Datasheet

MFR RecommendedRFQ

EL3H7(A)-G

Everlight Electronics Co LtdIn Stock: 2115EL3H7(A)-G Datasheet

MFR RecommendedRFQ

EL3H7(B)(TA)-VG

Everlight Electronics Co LtdIn Stock: 1519EL3H7(B)(TA)-VG Datasheet

MFR RecommendedRFQ

EL3H7(B)-G

Everlight Electronics Co LtdIn Stock: 1683EL3H7(B)-G Datasheet

MFR RecommendedRFQ

EL3H7(EA)-VG

Everlight Electronics Co LtdIn Stock: 3901EL3H7(EA)-VG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the VOS615AT is determined by strict adherence to the following critical parameters:

Mandatory Matching Parameters:

• Voltage - Isolation: 3750Vrms (all substitutes must match exactly)
• Number of Channels: 1 (single channel configuration)
• Output Type: Transistor (not photodiode or other output types)
• Voltage - Output (Max): 80V (maximum collector-emitter voltage)
• Current - Output / Channel: 50mA (maximum output current rating)
• Voltage - Forward (Vf) (Typ): 1.2V (input LED forward voltage)
• Current - DC Forward (If) (Max): 50mA (maximum input current)
• Operating Temperature: -55°C ~ 110°C (temperature range)
• Mounting Type: Surface Mount
• Package / Case: 4-SOIC (0.173", 4.40mm Width)
• Supplier Device Package: 4-SSOP

Variable Parameters (Allowed to Differ):

• Current Transfer Ratio (CTR) at specified test current
• Turn On / Turn Off Time
• Rise / Fall Time
• Vce Saturation (Max)
• Packaging format (Tape & Reel, Tube, Cut Tape & Digi-Reel)

All five EL3H7 variants from Everlight Electronics Co Ltd meet the mandatory matching criteria and are therefore valid substitutes for the VOS615AT.

Parameter Comparison

Engineering Selection Recommendations

All five EL3H7 variants are valid substitutes for the VOS615AT based on compliance and product status criteria. Both the primary part and all substitutes maintain active production status and ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Vce Saturation Consideration: The EL3H7 series exhibits a lower maximum Vce saturation of 200mV compared to the VOS615AT at 400mV. This represents improved saturation performance and does not create compatibility issues in applications designed for the VOS615AT specification.

Current Transfer Ratio Variants: The EL3H7 series is available in three CTR grades (80%, 130%, and 50-600% range). Selection should be based on the specific CTR requirement of the application circuit. The EL3H7(EA)-VG variant provides the widest CTR range (50-600% @ 5mA), matching the upper specification of the VOS615AT.

Packaging Format Selection: Choose the packaging format based on manufacturing process requirements:

• Tape & Reel (TR): EL3H7(A)(EA)-G or EL3H7(EA)-VG for automated pick-and-place assembly
• Tube: EL3H7(A)-G or EL3H7(B)-G for manual assembly or lower-volume production
• Cut Tape & Digi-Reel: EL3H7(B)(TA)-VG for flexible handling and mixed-volume scenarios

Frequently Asked Questions (FAQ)

Q: Can I use any EL3H7 variant as a direct replacement for VOS615AT?

A: Yes. All five EL3H7 variants meet the mandatory electrical and mechanical specifications for substitution. The choice between variants depends on your specific current transfer ratio requirement and packaging format preference for your manufacturing process.

Q: What is the significance of the different CTR grades in the EL3H7 series?

A: Current Transfer Ratio (CTR) defines the ratio of output current to input current. The EL3H7 series offers three grades: 80% (A variants), 130% (B variants), and 50-600% (EA variant). Select the grade that matches your circuit's CTR requirement. The VOS615AT specification of 50-600% @ 10mA is most closely matched by EL3H7(EA)-VG at 50-600% @ 5mA.

Q: Are there any timing differences I should consider?

A: The VOS615AT specifies turn-on/turn-off times of 5µs and rise/fall times of 3µs/4µs. The EL3H7 variants do not publish turn-on/turn-off times but specify rise/fall times of 5µs/3µs. For timing-critical applications, verify that the EL3H7 rise/fall time specification meets your circuit requirements.

Q: What is the difference between Tape & Reel, Tube, and Cut Tape packaging?

A: Tape & Reel (TR) is standard for high-volume automated assembly with pick-and-place equipment. Tube packaging is used for manual assembly or lower-volume production runs. Cut Tape & Digi-Reel provides flexibility for mixed-volume scenarios. All three formats contain the same component; the difference is in handling and dispensing method.

Q: Does the lower Vce saturation of the EL3H7 (200mV vs 400mV) affect compatibility?

A: No. Lower Vce saturation represents improved performance. If your circuit was designed for the VOS615AT's 400mV maximum saturation, the EL3H7's 200mV saturation will not cause compatibility issues and may improve circuit efficiency.

Q: Are all these parts ROHS3 compliant?

A: Yes. Both the VOS615AT and all EL3H7 variants are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity), ensuring compliance with environmental regulations and long-term storage capability without special handling.

Q: Which EL3H7 variant should I choose if I'm unsure about CTR requirements?

A: If your application requires the widest CTR range for maximum flexibility, select EL3H7(EA)-VG, which provides 50-600% @ 5mA, matching the VOS615AT's upper specification range. For packaging, choose based on your manufacturing process: Tape & Reel for automated assembly or Tube for manual assembly.