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

Part Overview

The EL817(S)(D)(TA)-VG is a single-channel optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides 5000Vrms isolation voltage and is designed for DC input applications requiring galvanic isolation in 4-SMD surface mount packages. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Active equivalent models from the EL816 and EL817 series maintain identical electrical specifications and mechanical compatibility while offering current product availability.

Key Parameters

Parameter	Value
Manufacturer	Everlight Electronics Co Ltd
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	300% @ 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the EL817(S)(D)(TA)-VG are qualified based on strict electrical and mechanical parameter matching within the optoisolator transistor output category. The substitution logic is determined by the following critical parameters:

Isolation Voltage: All substitutes maintain 5000Vrms isolation voltage, matching the primary part specification.

Current Transfer Ratio: All substitutes provide 300% minimum and 600% maximum CTR at 5mA input current, ensuring equivalent optical coupling efficiency.

Output Characteristics: All substitutes feature transistor output with 80V maximum output voltage and 50mA maximum output current per channel, maintaining identical load-driving capability.

Input Type: All substitutes accept DC input, matching the primary part's input interface requirement.

Saturation Voltage: All substitutes specify 200mV maximum Vce saturation, ensuring equivalent switching performance.

Package and Mounting: All substitutes use 4-SMD surface mount packages with gull wing leads, providing mechanical and footprint compatibility.

Operating Temperature Range: All substitutes operate across -55°C to 110°C, matching the primary part's thermal specification.

Compliance: All substitutes maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating.

The EL816 series variants differ from the EL817 series only in rise/fall time characteristics (4µs/3µs versus 6µs/8µs), which does not affect substitutability for applications where switching speed is not a critical constraint. The EL817(S)(D)(TD)-VG and EL817(S)(D)(TD)-G variants maintain identical specifications to the primary part and are direct equivalents.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 5mA	CTR Max @ 5mA	Output Voltage (Max)	Output Current	Vce Sat (Max)	Rise/Fall Time	Operating Temp	Package	Product Status	Inventory
EL817(S)(D)(TA)-VG	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	6µs, 8µs	-55°C ~ 110°C	4-SMD	Discontinued	739 Pcs
EL816(S)(D)(TD)	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	4µs, 3µs	-55°C ~ 110°C	4-SMD	Active	1010 Pcs
EL816(S)(D)(TD)-V	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	4µs, 3µs	-55°C ~ 110°C	4-SMD	Active	962 Pcs
EL816(S)(D)(TU)	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	4µs, 3µs	-55°C ~ 110°C	4-SMD	Active	909 Pcs
EL816(S)(D)(TU)-V	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	4µs, 3µs	-55°C ~ 110°C	4-SMD	Active	634 Pcs
EL816(S1)(D)(TD)	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	4µs, 3µs	-55°C ~ 110°C	4-SMD	Active	1001 Pcs
EL816(S1)(D)(TD)-V	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	4µs, 3µs	-55°C ~ 110°C	4-SMD	Active	959 Pcs
EL816(S1)(D)(TU)	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	4µs, 3µs	-55°C ~ 110°C	4-SMD	Active	671 Pcs
EL816(S1)(D)(TU)-V	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	4µs, 3µs	-55°C ~ 110°C	4-SMD	Active	756 Pcs
EL817(S)(D)(TD)-G	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	6µs, 8µs	-55°C ~ 110°C	4-SMD	Active	815 Pcs
EL817(S)(D)(TD)-VG	Everlight	5000Vrms	300%	600%	80V	50mA	200mV	6µs, 8µs	-55°C ~ 110°C	4-SMD	Active	1065 Pcs

Engineering Selection Recommendations

Primary Substitutes (Identical Specifications):

EL817(S)(D)(TD)-VG and EL817(S)(D)(TD)-G are direct functional equivalents to the discontinued EL817(S)(D)(TA)-VG. Both maintain identical electrical parameters including 6µs/8µs rise/fall time characteristics. EL817(S)(D)(TD)-VG offers the highest current inventory at 1065 pieces and maintains active product status, making it the preferred primary substitute. Both parts maintain ROHS3 compliance and MSL Level 1 rating.

Secondary Substitutes (EL816 Series):

The EL816 series variants provide complete electrical equivalence with the exception of switching speed characteristics. EL816 parts specify 4µs/3µs rise/fall times compared to the 6µs/8µs specification of the EL817 series. This faster switching performance does not prevent substitution in applications where switching speed is not a limiting design constraint. All EL816 variants maintain 5000Vrms isolation, identical current transfer ratios, output voltage/current ratings, and saturation voltage specifications. EL816(S)(D)(TD) offers the highest inventory among EL816 variants at 1010 pieces.

Product Status Consideration:

All substitute parts maintain active product status with Everlight Electronics, ensuring long-term availability and supply chain continuity. The primary part EL817(S)(D)(TA)-VG is discontinued at DiGi Electronics, necessitating transition to active equivalents.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the primary part's environmental and regulatory qualifications.

Frequently Asked Questions (FAQ)

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

A: EL816 series parts are electrically equivalent for all critical parameters including isolation voltage, current transfer ratio, output voltage/current ratings, and saturation voltage. The primary difference is switching speed: EL816 parts feature 4µs/3µs rise/fall times versus 6µs/8µs for EL817 parts. Substitution is valid when circuit timing does not depend on the slower EL817 switching characteristics. If the design requires the specific 6µs/8µs timing, use EL817(S)(D)(TD)-VG or EL817(S)(D)(TD)-G instead.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use 4-SMD surface mount packages with gull wing leads, providing identical mechanical compatibility and PCB footprint matching with the primary part EL817(S)(D)(TA)-VG.

Q: What is the difference between EL816(S)(D)(TD) and EL816(S1)(D)(TD)?

A: Both variants maintain identical electrical specifications for isolation voltage, current transfer ratio, output characteristics, and operating temperature range. The designation difference (S versus S1) reflects internal design variations that do not affect substitutability. Both are functionally equivalent for circuit applications.

Q: Do all substitute parts meet the same environmental and compliance standards?

A: Yes. All substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the primary part's environmental qualifications. All parts operate across the identical -55°C to 110°C temperature range.

Q: Which substitute part offers the best inventory availability?

A: EL817(S)(D)(TD)-VG provides the highest inventory at 1065 pieces while maintaining identical specifications to the discontinued primary part. EL816(S)(D)(TD) offers the highest inventory among EL816 variants at 1010 pieces.

Q: Can I use EL816 and EL817 parts interchangeably in the same design?

A: Interchangeability depends on circuit timing requirements. Both series maintain identical electrical specifications except for rise/fall time. If the circuit design does not impose timing constraints that require the specific 6µs/8µs or 4µs/3µs characteristics, parts from both series are functionally equivalent. If timing is critical, maintain consistency within a single series.

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