EL817(S)(TA)-VG Equivalent & Substitute Parts

Part Overview

The EL817(S)(TA)-VG is a 5000Vrms optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel device features a 4-SMD gull wing package and is designed for DC input applications requiring galvanic isolation. The part is currently discontinued at DiGi Electronics, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for direct circuit substitution.

Key Parameters

Parameter	Value
Manufacturer Part Number	EL817(S)(TA)-VG
Manufacturer	Everlight Electronics Co Ltd
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	60mA
Vce Saturation (Max)	200mV
Operating Temperature	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Input Type	DC
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the EL817(S)(TA)-VG are identified based on strict electrical and mechanical parameter matching. The critical substitution criteria are:

Electrical Parameters:

Voltage - Isolation: 5000Vrms (mandatory match)
Number of Channels: 1 (mandatory match)
Current Transfer Ratio: 50% @ 5mA minimum, 600% @ 5mA maximum (mandatory match)
Output Type: Transistor (mandatory match)
Voltage - Output (Max): 80V (mandatory match)
Current - Output / Channel: 50mA (mandatory match)
Voltage - Forward (Vf) (Typ): 1.2V (mandatory match)
Current - DC Forward (If) (Max): 60mA (mandatory match)
Vce Saturation (Max): 200mV (mandatory match)
Operating Temperature: -55°C ~ 110°C (mandatory match)
Input Type: DC (mandatory match)

Mechanical Parameters:

Mounting Type: Surface Mount (mandatory match)
Package / Case: 4-SMD, Gull Wing (mandatory match)

Compliance Parameters:

RoHS Status: ROHS3 Compliant (mandatory match)
Moisture Sensitivity Level (MSL): 1 (Unlimited) (mandatory match)

All substitute parts listed maintain identical electrical specifications and mechanical compatibility. Variations in rise/fall time (6µs/8µs for EL817 series versus 4µs/3µs for EL816 series) do not disqualify substitution as these parameters fall within acceptable operational ranges for the optoisolator function. Product status prioritizes active parts over discontinued alternatives.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	Channels	CTR Min @ 5mA	CTR Max @ 5mA	Output Type	Vout Max	Iout / Channel	Vf Typ	If Max	Vce Sat Max	Temp Range	Package	Product Status
EL817(S)(TA)-VG	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Discontinued
EL816(S)(TD)	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active
EL816(S)(TD)-V	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active
EL816(S)(TU)-V	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active
EL816(S1)(TD)	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active
EL816(S1)(TD)-V	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active
EL816(S1)(TU)	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active
EL816(S1)(TU)-V	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active
EL816S1(I)(TU)-V	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active
EL817(S)(TD)-G	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active
EL817(S)(TD)-VG	Everlight	5000Vrms	1	50%	600%	Transistor	80V	50mA	1.2V	60mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active

Engineering Selection Recommendations

All listed substitute parts are manufactured by Everlight Electronics Co Ltd and maintain full electrical and mechanical compatibility with the EL817(S)(TA)-VG. Selection among available substitutes is based on the following criteria:

Product Status Priority: Active parts are preferred over discontinued alternatives. The EL817(S)(TA)-VG is discontinued at DiGi Electronics; therefore, active equivalents from the EL816 and EL817 series provide continuity of supply.

Compliance and Certification: All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental specifications.

Inventory Availability: Parts with higher inventory levels provide greater supply security. EL816S1(I)(TU)-V offers the highest inventory at 105,600 pieces. EL817(S)(TD)-VG and EL817(S)(TD)-G provide active alternatives within the EL817 series with 915 and 1,087 pieces respectively.

Packaging Considerations: EL816S1(I)(TU)-V is supplied in Tape & Reel (TR) packaging, suitable for automated assembly. Other substitutes are available in standard packaging configurations.

Series Selection: EL816 series parts feature rise/fall times of 4µs and 3µs, while EL817 series parts (including the original) feature 6µs and 8µs. Both timing specifications are functionally equivalent for DC input optoisolator applications and do not restrict substitution.

Frequently Asked Questions (FAQ)

Q: Can EL816 series parts directly replace the EL817(S)(TA)-VG?

A: Yes. EL816 and EL817 series parts share identical electrical specifications for isolation voltage, current transfer ratio, output voltage, output current, forward voltage, saturation voltage, and operating temperature range. The difference in rise/fall time does not affect functional compatibility in standard optoisolator applications.

Q: What is the significance of the suffix variations (TD, TU, S, S1, etc.) in the part numbers?

A: Suffix variations indicate manufacturing process codes and packaging designations assigned by Everlight Electronics. All listed variants maintain the same core electrical specifications and are functionally equivalent for circuit substitution purposes.

Q: Is the EL816S1(I)(TU)-V suitable for automated assembly?

A: Yes. EL816S1(I)(TU)-V is supplied in Tape & Reel (TR) packaging, which is standard for automated pick-and-place assembly equipment. Other substitutes are available in standard packaging configurations suitable for manual or semi-automated assembly.

Q: Do all substitute parts meet the same RoHS and moisture sensitivity requirements?

A: Yes. All substitute parts listed are ROHS3 compliant and carry MSL Level 1 (Unlimited) rating, matching the original EL817(S)(TA)-VG specifications.

Q: Which substitute part offers the best supply availability?

A: EL816S1(I)(TU)-V provides the highest inventory level at 105,600 pieces. For EL817 series alternatives, EL817(S)(TD)-VG offers 915 pieces and EL817(S)(TD)-G offers 1,087 pieces.

Q: Are there any electrical performance differences between the substitute parts?

A: No. All substitute parts maintain identical electrical specifications across isolation voltage, current transfer ratio, output characteristics, and operating temperature range. Rise/fall time variations between EL816 and EL817 series do not constitute performance differences relevant to optoisolator function.

Q: Can I use these substitutes in existing PCB designs without layout modifications?

A: Yes. All substitute parts use the 4-SMD gull wing package with identical pin configuration and footprint compatibility, allowing direct PCB substitution without layout changes.

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