EL817S(A)(TA)-V Equivalent & Substitute Parts

Part Overview

The EL817S(A)(TA)-V is a 5000Vrms optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel device features a 4-SMD surface mount package and is designed for DC input applications requiring galvanic isolation. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain identical electrical and mechanical specifications for seamless circuit integration.

Key Parameters

Parameter	Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	80% @ 5mA
Current Transfer Ratio (Max)	160% @ 5mA
Rise / Fall Time (Typ)	4µs, 3µs
Input Type	DC
Output Type	Transistor
Voltage - Output (Max)	35V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	60 mA
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 EL817S(A)(TA)-V is determined by strict equivalence across the following critical parameters:

Isolation Voltage: 5000Vrms (all substitutes maintain this specification)

Channel Configuration: Single channel (1 channel)

Current Transfer Ratio: 80% minimum and 160% maximum at 5mA input current

Output Characteristics: Transistor output with 35V maximum output voltage and 50mA maximum output current per channel

Switching Performance: Rise time 4µs and fall time 3µs

Input Configuration: DC input type

Saturation Voltage: 200mV maximum Vce saturation

Temperature Range: -55°C to 110°C operating temperature

Mounting and Package: Surface mount technology with 4-SMD gull wing package configuration

Compliance: ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity)

All substitute parts listed maintain 100% equivalence across these parameters. Variations in manufacturer (Everlight Electronics vs. Würth Elektronik) and specific package designations (4-DIP-S, 4-DIP-SL) do not affect electrical performance or circuit compatibility.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	Channels	CTR Min @ 5mA	CTR Max @ 5mA	Output Voltage (Max)	Output Current	Vce Sat (Max)	Temp Range	Product Status	Inventory
EL817S(A)(TA)-V	Everlight Electronics	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Discontinued	814 Pcs
EL817(S)(A)(TD)	Everlight Electronics	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	955 Pcs
EL817(S)(A)(TD)-V	Everlight Electronics	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	989 Pcs
EL817(S)(A)(TU)	Everlight Electronics	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	1057 Pcs
EL817(S)(A)(TU)-V	Everlight Electronics	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	747 Pcs
EL817(S1)(A)(TD)	Everlight Electronics	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	744 Pcs
EL817(S1)(A)(TD)-V	Everlight Electronics	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	1112 Pcs
EL817(S1)(A)(TU)	Everlight Electronics	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	702 Pcs
EL817S1(A)(TU)-V	Everlight Electronics	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	776 Pcs
140817142100	Würth Elektronik	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	2391 Pcs
140817143100	Würth Elektronik	5000Vrms	1	80%	160%	35V	50mA	200mV	-55°C ~ 110°C	Active	2284 Pcs

Engineering Selection Recommendations

Primary Substitutes (Everlight Electronics Manufacturer):

The EL817(S1)(A)(TD)-V offers the highest inventory availability (1112 Pcs) among Everlight alternatives while maintaining active product status. This part is the direct functional equivalent with identical electrical specifications and ROHS3 compliance. The EL817(S)(A)(TD)-V (989 Pcs) and EL817(S)(A)(TU) (1057 Pcs) provide additional options with comparable availability.

Secondary Substitutes (Würth Elektronik Manufacturer):

The 140817143100 and 140817142100 from Würth Elektronik are parametrically equivalent alternatives with significantly higher inventory levels (2284 Pcs and 2391 Pcs respectively). Both parts maintain identical electrical performance, ROHS3 compliance, and MSL Level 1 rating. These parts are manufactured under the WL-OCPT series designation and feature package designations of 4-DIP-SL and 4-DIP-S respectively, which are mechanically compatible with the original 4-SMD gull wing configuration for surface mount applications.

Product Status Consideration:

All recommended substitutes maintain active product status, ensuring long-term availability and supply chain stability. The original EL817S(A)(TA)-V discontinuation status makes selection of active alternatives essential for new designs and ongoing production requirements.

Compliance Verification:

All substitute parts carry ROHS3 compliance certification and MSL Level 1 (unlimited) moisture sensitivity rating, matching the original part's environmental and regulatory qualifications.

Frequently Asked Questions (FAQ)

Q: Can the EL817(S)(A)(TD)-V directly replace the discontinued EL817S(A)(TA)-V?

A: Yes. The EL817(S)(A)(TD)-V is a parametric equivalent with identical isolation voltage (5000Vrms), current transfer ratio (80-160% @ 5mA), output specifications (35V, 50mA), saturation voltage (200mV), and operating temperature range (-55°C to 110°C). Both parts are ROHS3 compliant with MSL Level 1 rating.

Q: What is the difference between Everlight and Würth Elektronik substitutes?

A: Both manufacturers provide optoisolators with identical electrical specifications. Würth Elektronik parts (140817142100, 140817143100) offer higher inventory availability and are designated as WL-OCPT series components. The choice between manufacturers depends on supply chain preferences and existing vendor relationships, as electrical performance is equivalent.

Q: Are the package designations (4-SMD, 4-DIP-S, 4-DIP-SL) interchangeable?

A: All listed parts are surface mount devices with gull wing lead configurations suitable for SMD assembly. The package designations reflect manufacturer nomenclature but represent mechanically compatible form factors for PCB mounting. Verify footprint compatibility with your specific PCB design before implementation.

Q: What parameters must remain constant for substitution?

A: Substitution requires equivalence in isolation voltage (5000Vrms), channel count (1), current transfer ratio range (80-160% @ 5mA), maximum output voltage (35V), maximum output current (50mA), Vce saturation (200mV), operating temperature (-55°C to 110°C), and input type (DC). All listed substitutes maintain these specifications.

Q: Is the forward voltage difference between Everlight (1.2V) and Würth (1.24V) significant?

A: The 0.04V difference falls within normal manufacturing tolerance ranges for optoisolator LED forward voltage specifications. This variation does not affect circuit functionality or require design modifications for typical applications.

Q: Which substitute offers the best availability?

A: The Würth Elektronik 140817142100 provides the highest inventory (2391 Pcs), followed by 140817143100 (2284 Pcs). Among Everlight alternatives, EL817(S1)(A)(TD)-V offers 1112 Pcs in stock.

Q: Do all substitutes carry the same compliance certifications?

A: Yes. All listed substitutes are ROHS3 compliant with MSL Level 1 (unlimited) moisture sensitivity rating. Würth Elektronik parts additionally carry REACH Unaffected status. All parts share the same ECCN (EAR99) and HTSUS (8541.49.8000) classifications.

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