EL817(S)(D)(TA)-G Optoisolator Equivalent & Substitute Parts

Part Overview

The EL817(S)(D)(TA)-G is a 5000Vrms optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel device is designed for DC input applications requiring galvanic isolation in 4-SMD surface mount packages. The main part is currently discontinued at DiGi Electronics, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	300% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Rise / Fall Time (Typ)	6µs, 8µs
Input Type	DC
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

Substitution of the EL817(S)(D)(TA)-G is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - Isolation: 5000Vrms
Number of Channels: 1
Current Transfer Ratio: 300% - 600% @ 5mA
Input Type: DC
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)

Allowable Variation: Rise / Fall Time specifications may vary within the EL816 and EL817 series. The EL816 variants exhibit 4µs and 3µs rise/fall times, while the EL817 variants maintain 6µs and 8µs specifications. Both timing profiles are acceptable substitutes provided all other parameters remain identical.

All substitute parts listed are manufactured by Everlight Electronics Co Ltd and maintain full electrical and mechanical compatibility with the main part number.

Parameter Comparison

Part Number	Isolation Voltage	CTR (Min/Max)	Rise/Fall Time	Output Voltage (Max)	Output Current	Vce Sat (Max)	Temp Range	Package	Product Status	Inventory
EL817(S)(D)(TA)-G	5000Vrms	300% / 600%	6µs, 8µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Discontinued	1105 Pcs
EL816(S)(D)(TD)	5000Vrms	300% / 600%	4µs, 3µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	1010 Pcs
EL816(S)(D)(TD)-V	5000Vrms	300% / 600%	4µs, 3µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	962 Pcs
EL816(S)(D)(TU)	5000Vrms	300% / 600%	4µs, 3µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	909 Pcs
EL816(S)(D)(TU)-V	5000Vrms	300% / 600%	4µs, 3µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	634 Pcs
EL816(S1)(D)(TD)	5000Vrms	300% / 600%	4µs, 3µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	1001 Pcs
EL816(S1)(D)(TD)-V	5000Vrms	300% / 600%	4µs, 3µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	959 Pcs
EL816(S1)(D)(TU)	5000Vrms	300% / 600%	4µs, 3µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	671 Pcs
EL816(S1)(D)(TU)-V	5000Vrms	300% / 600%	4µs, 3µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	756 Pcs
EL817(S)(D)(TD)-G	5000Vrms	300% / 600%	6µs, 8µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	815 Pcs
EL817(S)(D)(TD)-VG	5000Vrms	300% / 600%	6µs, 8µs	80V	50mA	200mV	-55°C ~ 110°C	4-SMD, Gull Wing	Active	1065 Pcs

Engineering Selection Recommendations

Primary Substitutes (EL817 Series - Identical Rise/Fall Time Profile):

EL817(S)(D)(TD)-G and EL817(S)(D)(TD)-VG are direct functional equivalents with matching 6µs and 8µs rise/fall time specifications. Both parts are active products with ROHS3 compliance and MSL 1 rating. These variants differ only in packaging designations (suffix -G versus -VG) and represent the closest electrical match to the discontinued EL817(S)(D)(TA)-G.

Secondary Substitutes (EL816 Series - Faster Switching Performance):

EL816(S)(D)(TD), EL816(S)(D)(TD)-V, EL816(S)(D)(TU), EL816(S)(D)(TU)-V, EL816(S1)(D)(TD), EL816(S1)(D)(TD)-V, EL816(S1)(D)(TU), and EL816(S1)(D)(TU)-V maintain all critical electrical parameters but exhibit faster rise/fall times of 4µs and 3µs. All EL816 variants are active products with ROHS3 compliance and MSL 1 rating. The faster switching characteristics of the EL816 series are compatible with applications designed for the EL817 series, as the EL816 represents an improvement in transient response.

Product Status Consideration:

All substitute parts listed are active products with ongoing availability. The main part EL817(S)(D)(TA)-G is discontinued, making substitution necessary for new designs and continued production support.

Frequently Asked Questions (FAQ)

Q: Can EL816 series parts substitute for EL817(S)(D)(TA)-G?

A: Yes. The EL816 series maintains all critical electrical parameters including isolation voltage, current transfer ratio, output voltage, output current, saturation voltage, and operating temperature range. The primary difference is faster rise/fall time (4µs, 3µs versus 6µs, 8µs). This represents improved switching performance and is compatible with EL817 applications.

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

A: Both variants maintain identical electrical specifications. The designations (TD versus TU) indicate different packaging or lead configuration options within the 4-SMD, Gull Wing package family. Electrical performance and pin compatibility remain unchanged.

Q: Are the -V suffix variants (e.g., EL816(S)(D)(TD)-V) compatible?

A: Yes. Parts with -V suffix designation maintain all electrical parameters and package specifications. The suffix indicates a packaging or supplier variant. Full compatibility is confirmed across all listed parameters.

Q: What does the (S) versus (S1) designation indicate?

A: Both (S) and (S1) variants maintain identical electrical specifications for isolation voltage, current transfer ratio, output characteristics, and operating temperature. Both are acceptable substitutes for the main part number.

Q: Is the 4-SMD, Gull Wing package consistent across all substitutes?

A: Yes. All substitute parts use the same 4-SMD, Gull Wing surface mount package. PCB layout and reflow soldering parameters remain compatible across all listed alternatives.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory specifications of the main part.

Q: Which substitute should be selected for new designs?

A: EL817(S)(D)(TD)-G or EL817(S)(D)(TD)-VG are recommended for new designs requiring identical switching characteristics to the original specification. For applications where faster switching is beneficial, any EL816 variant provides equivalent isolation and output performance with improved transient response.

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