EL817(S)(TB)-V Equivalent & Substitute Parts

Part Overview

The EL817(S)(TB)-V is a 5000Vrms optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This single-channel device operates in the 4-SMD surface mount package with gull wing leads and is designed for DC input applications requiring galvanic isolation. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines. Substitute parts maintain identical electrical performance specifications while offering continued availability through active manufacturing status.

Key Parameters

Parameter	Value
Voltage - Isolation	5000Vrms
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	35V
Current - Output / Channel	50mA
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	60mA
Vce Saturation (Max)	200mV
Rise / Fall Time (Typ)	4µs, 3µs
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

Substitution of the EL817(S)(TB)-V is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish substitution validity:

Electrical Equivalence Criteria:

Voltage - Isolation: 5000Vrms
Number of Channels: 1
Current Transfer Ratio: 50% (Min) @ 5mA and 600% (Max) @ 5mA
Output Type: Transistor
Voltage - Output (Max): 35V
Current - Output / Channel: 50mA
Voltage - Forward (Vf) (Typ): 1.2V or 1.24V
Current - DC Forward (If) (Max): 60mA
Vce Saturation (Max): 200mV
Operating Temperature: -55°C ~ 110°C
Input Type: DC

Mechanical Equivalence Criteria:

Mounting Type: Surface Mount
Package / Case: 4-SMD, Gull Wing (or equivalent 4-DIP-S / 4-DIP-SL variants)

Compliance Criteria:

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

Substitute parts are grouped into two categories: Everlight Electronics variants (EL817 series with different suffix designations) and Würth Elektronik equivalents (140817 series). All listed substitutes meet the above criteria and are confirmed as active products with current manufacturing status.

Parameter Comparison

Parameter	EL817(S)(TB)-V	EL817(S)(TD)	EL817(S)(TD)-V	EL817(S)(TU)	EL817(S)(TU)-V	EL817(S1)(TD)	EL817(S1)(TD)-V	EL817(S1)(TU)	EL817(S1)(TU)-V	140817142000	140817143000
Manufacturer	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Everlight	Würth Elektronik	Würth Elektronik
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
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)	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Vce Saturation (Max)	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV
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
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
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	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

Everlight Electronics EL817 Series Substitutes

The EL817(S)(TD), EL817(S)(TD)-V, EL817(S)(TU), EL817(S)(TU)-V, EL817(S1)(TD), EL817(S1)(TD)-V, EL817(S1)(TU), and EL817(S1)(TU)-V are direct parametric equivalents manufactured by Everlight Electronics. All variants maintain identical electrical specifications and are ROHS3 compliant with MSL 1 rating. These parts are currently in active production status, ensuring continued availability. Selection among Everlight variants is based on internal suffix designations (S vs. S1, TD vs. TU) which do not affect electrical performance or mechanical compatibility. The "-V" suffix variants are functionally equivalent to non-suffixed versions.

Würth Elektronik WL-OCPT Series Substitutes

The 140817142000 and 140817143000 are Würth Elektronik equivalents offering identical electrical performance with minor packaging designation differences (4-DIP-S and 4-DIP-SL respectively). These parts maintain the same 5000Vrms isolation, transistor output configuration, and current transfer ratio specifications. Forward voltage is specified at 1.24V compared to 1.2V in Everlight variants, which remains within acceptable tolerance for circuit operation. Both Würth Elektronik parts are ROHS3 compliant, MSL 1 rated, and actively manufactured.

Availability and Compliance

All substitute parts listed are actively produced and carry ROHS3 compliance certification. The Everlight variants offer the highest inventory levels (680–1120 pieces) with immediate availability. Würth Elektronik alternatives provide additional sourcing options with substantial stock (1806–2671 pieces). Selection should prioritize active product status and compliance certifications as the primary criteria for component replacement.

Frequently Asked Questions (FAQ)

Q: Can EL817(S)(TD) replace EL817(S)(TB)-V in existing designs?

A: Yes. The EL817(S)(TD) is a parametric equivalent with identical electrical specifications including 5000Vrms isolation, 50–600% current transfer ratio, 35V maximum output voltage, and 50mA output current. Both use 4-SMD gull wing packages and operate across -55°C to 110°C. The primary difference is product status: EL817(S)(TB)-V is discontinued while EL817(S)(TD) is actively manufactured.

Q: What is the difference between EL817(S) and EL817(S1) variants?

A: The provided data does not specify functional differences between S and S1 designations. Both maintain identical electrical parameters and are mechanically compatible. Selection between these variants should be based on availability and supplier preference.

Q: Are Würth Elektronik 140817 parts compatible with Everlight EL817 designs?

A: Yes. The 140817142000 and 140817143000 are parametric equivalents with matching isolation voltage, output type, current transfer ratio, and operating temperature range. The forward voltage specification differs slightly (1.24V vs. 1.2V), which does not affect circuit functionality. Package designations (4-DIP-S and 4-DIP-SL) are mechanically equivalent to the 4-SMD gull wing configuration.

Q: What does the "-V" suffix indicate in part numbers?

A: The provided data does not specify the functional meaning of the "-V" suffix. Parts with and without this suffix maintain identical electrical specifications and are functionally interchangeable.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original EL817(S)(TB)-V specifications.

Q: Which substitute offers the best availability?

A: The 140817143000 (Würth Elektronik) has the highest inventory at 2671 pieces. Among Everlight variants, EL817(S)(TD) offers 1120 pieces and EL817(S1)(TU)-V offers 1044 pieces.

Q: Can I use these parts interchangeably on the same PCB?

A: Yes. All substitute parts use identical 4-SMD gull wing surface mount packages with the same pin configuration and electrical characteristics, allowing direct PCB substitution without design modification.

Q: What is the operating temperature range for all substitutes?

A: All substitute parts operate across -55°C to 110°C, matching the original EL817(S)(TB)-V specification.

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