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

Part Overview

The EL817S(C)(TA)-V 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 part is currently discontinued at DiGi Electronics, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct component substitution in existing designs.

Key Parameters

Parameter	Value
Manufacturer	Everlight Electronics Co Ltd
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 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(C)(TA)-V is determined by strict equivalence across the following critical parameters:

Isolation Voltage: 5000Vrms (non-negotiable for safety-critical applications)

Current Transfer Ratio: 200% minimum and 400% maximum at 5mA input current

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

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

Input Configuration: DC input only

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

Package Format: 4-SMD surface mount with gull wing leads

Compliance: ROHS3 compliant with MSL 1 rating

Substitute parts are grouped into two categories: Everlight Electronics EL817 series variants (differing only in temperature grade suffix designations) and Würth Elektronik WL-OCPT series equivalents. All listed substitutes maintain identical electrical performance specifications and thermal operating ranges. Package designations (4-DIP-S, 4-DIP-SL) represent equivalent surface mount configurations.

Parameter Comparison

Parameter	EL817S(C)(TA)-V	EL817(S)(C)(TD)	EL817(S)(C)(TD)-V	EL817(S)(C)(TU)	EL817(S)(C)(TU)-V	EL817(S1)(C)(TD)	EL817(S1)(C)(TD)-V	EL817(S1)(C)(TU)	EL817(S1)(C)(TU)-V	140817142300	140817143300
Manufacturer	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Würth	Würth
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA	400% @ 5mA
Rise / Fall Time (Typ)	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs	3µs, 4µs	3µs, 4µs
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	35V	35V	35V	35V	35V	35V	35V	35V	35V	35V	35V
Current - Output / Channel	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.24V	1.24V
Current - DC Forward (If) (Max)	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA	60 mA
Vce Saturation (Max)	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV
Operating Temperature	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 110°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Discontinued	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Everlight Electronics EL817 Series)

The EL817(S)(C)(TD), EL817(S)(C)(TD)-V, EL817(S)(C)(TU), EL817(S)(C)(TU)-V, EL817(S1)(C)(TD), EL817(S1)(C)(TD)-V, EL817(S1)(C)(TU), and EL817(S1)(C)(TU)-V are all active products from Everlight Electronics with identical electrical specifications to the discontinued EL817S(C)(TA)-V. These variants differ only in temperature grade designations (TD, TU, S1 suffixes) which do not affect the core electrical performance parameters. All maintain ROHS3 compliance and MSL 1 rating. Current inventory availability ranges from 620 to 1079 pieces across variants.

Secondary Substitutes (Würth Elektronik WL-OCPT Series)

The 140817142300 and 140817143300 from Würth Elektronik represent equivalent optoisolator solutions with identical isolation voltage, current transfer ratio specifications, output voltage and current ratings, and operating temperature range. These parts are supplied in Tape & Reel packaging with 4-DIP-S and 4-DIP-SL package designations respectively, which are functionally equivalent surface mount configurations to the 4-SMD Gull Wing format. Forward voltage specification is 1.24V (compared to 1.2V nominal) and rise/fall times are specified in reverse order (3µs, 4µs), but these represent equivalent performance within the same functional class. Both Würth parts carry ROHS3 compliance and REACH Unaffected status. Inventory availability is 1094 and 1297 pieces respectively.

All listed substitutes are suitable for direct replacement in applications requiring 5000Vrms isolation with single-channel transistor output and DC input control.

Frequently Asked Questions (FAQ)

Q: Can EL817(S)(C)(TD) directly replace EL817S(C)(TA)-V in existing PCB designs?

A: Yes. The EL817(S)(C)(TD) maintains identical electrical specifications and 4-SMD Gull Wing package format. The suffix change from TA to TD indicates a different temperature grade designation but does not alter electrical performance parameters. No circuit modifications are required.

Q: What is the difference between EL817(S)(C)(TU) and EL817(S)(C)(TD) variants?

A: Both variants are electrically identical with 5000Vrms isolation, 200-400% current transfer ratio, and identical output characteristics. The suffix designations (TU vs TD) represent different temperature grade classifications from Everlight Electronics but do not affect functional performance in the specified -55°C to 110°C operating range.

Q: Are Würth Elektronik 140817142300 and 140817143300 compatible with Everlight EL817 designs?

A: Yes. Both Würth parts meet all critical electrical specifications: 5000Vrms isolation, 200-400% current transfer ratio, 35V maximum output voltage, 50mA output current, and -55°C to 110°C operating temperature. Package designations (4-DIP-S, 4-DIP-SL) are equivalent surface mount configurations. Forward voltage specification of 1.24V is within acceptable tolerance of the 1.2V nominal value.

Q: What does the "-V" suffix in part numbers like EL817(S)(C)(TD)-V indicate?

A: The "-V" suffix represents a specific temperature grade or packaging variant designation from Everlight Electronics. Electrically, parts with and without the "-V" suffix maintain identical performance specifications for isolation voltage, current transfer ratio, output characteristics, and switching times.

Q: Can I use 140817143300 (4-DIP-SL) instead of 140817142300 (4-DIP-S)?

A: Yes. Both Würth parts are electrically equivalent with identical isolation voltage, current transfer ratio, output voltage/current ratings, and operating temperature. The package designations (4-DIP-S vs 4-DIP-SL) represent different surface mount lead configurations but are functionally interchangeable for circuit operation.

Q: What is the significance of the "S1" designation in EL817(S1)(C)(TD) and EL817(S1)(C)(TU)?

A: The S1 designation represents a variant classification from Everlight Electronics. Electrically, EL817(S1) variants are identical to EL817(S) variants across all specified parameters: isolation voltage, current transfer ratio, output characteristics, and thermal operating range.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All Everlight EL817 variants and Würth WL-OCPT parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting environmental and regulatory requirements for modern electronics manufacturing.

Q: What inventory status should I consider when selecting a substitute?

A: All listed substitutes are currently active products with confirmed inventory availability. Everlight variants range from 620 to 1079 pieces in stock. Würth parts have 1094 and 1297 pieces available. Selection should prioritize active status and adequate inventory for production requirements.

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