EL357N(TA)-VG Equivalent & Substitute Parts

Part Overview

The EL357N(TA)-VG is an optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides 3750Vrms isolation voltage in a 4-SOP surface mount package, designed for DC input applications requiring galvanic isolation. The part is active and in production, with 1125 pieces currently in stock. Alternative equivalent parts may be required due to packaging preferences, current transfer ratio specifications, output current requirements, or supply chain considerations.

Key Parameters

Parameter	Value
Isolation Voltage	3750Vrms
Number of Channels	1
Output Type	Transistor
Input Type	DC
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	600% @ 5mA
Maximum Output Voltage	80V
Output Current per Channel	50mA
Forward Voltage (Typ)	1.2V
Vce Saturation (Max)	200mV
Operating Temperature Range	-55°C to 110°C
Package Type	4-SMD, Gull Wing
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the EL357N(TA)-VG is determined by the following critical parameters:

Primary Substitution Criteria:

Isolation voltage: 3750Vrms (exact match required)
Output type: Transistor (exact match required)
Input type: DC (exact match required)
Number of channels: 1 (exact match required)
Package configuration: 4-SMD, Gull Wing (exact match required)
Mounting type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

Current Transfer Ratio range: Must encompass or fall within 50% to 600% @ 5mA
Maximum output voltage: 80V or greater
Output current per channel: 50mA or greater
Forward voltage: 1.2V to 1.3V typical
Vce saturation: 200mV to 400mV maximum
Operating temperature: Must include -55°C to 110°C range or be compatible with application requirements
RoHS3 compliance required

The substitute parts listed below meet all primary criteria and maintain compatibility within the secondary parameter ranges. Parts are grouped by manufacturer and specific current transfer ratio grades.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 5mA	CTR Max @ 5mA	Output Current	Vce Sat (Max)	Temp Range	Package	Packaging Type
EL357N(TA)-VG	Everlight	3750Vrms	50%	600%	50mA	200mV	-55 to 110°C	4-SOP	Tape & Reel
FODM121	onsemi	3750Vrms	50%	600%	80mA	400mV	-40 to 110°C	4-SMD	Tube
FODM121AR2	onsemi	3750Vrms	100%	300%	80mA	400mV	-40 to 110°C	4-SMD	Tape & Reel
FODM121B	onsemi	3750Vrms	50%	150%	80mA	400mV	-40 to 110°C	4-SMD	Tube
FODM121C	onsemi	3750Vrms	100%	200%	80mA	400mV	-40 to 110°C	4-SMD	Tube
FODM121CR2	onsemi	3750Vrms	100%	200%	80mA	400mV	-40 to 110°C	4-SMD	Tape & Reel
FODM121R2	onsemi	3750Vrms	50%	600%	80mA	400mV	-40 to 110°C	4-SMD	Tape & Reel
FODM124	onsemi	3750Vrms	100% @ 1mA	1200% @ 1mA	80mA	400mV	-40 to 110°C	4-SMD	Tube
FODM124R2	onsemi	3750Vrms	100% @ 1mA	1200% @ 1mA	80mA	400mV	-40 to 110°C	4-SMD	Cut Tape & Digi-Reel
HCPL-181-000E	Broadcom	3750Vrms	50%	600%	50mA	200mV	-55 to 100°C	4-SOIC	Cut Tape & Digi-Reel
HCPL-181-00AE	Broadcom	3750Vrms	80%	160%	50mA	200mV	-55 to 100°C	4-Mini-Flat	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Electrical Equivalents (Identical Electrical Performance):

FODM121R2 and HCPL-181-000E provide identical current transfer ratio specifications (50% to 600% @ 5mA) and identical Vce saturation (200mV max) to the EL357N(TA)-VG. Both parts are RoHS3 compliant and MSL 1 rated. FODM121R2 offers higher output current capability (80mA vs 50mA) and is supplied in Tape & Reel packaging. HCPL-181-000E is supplied in Cut Tape & Digi-Reel format with a 4-SOIC package footprint.

Higher Output Current Variants:

FODM121, FODM121B, FODM121C, FODM121CR2, FODM124, and FODM124R2 all provide 80mA output current capability compared to the 50mA of the EL357N(TA)-VG. These parts maintain 3750Vrms isolation and are suitable for applications requiring higher output drive capability. FODM124 and FODM124R2 feature significantly higher current transfer ratios (100% to 1200% @ 1mA) and are appropriate for low-input-current applications.

Temperature Range Consideration:

The EL357N(TA)-VG operates from -55°C to 110°C. onsemi FODM series parts operate from -40°C to 110°C, and Broadcom HCPL-181 series parts operate from -55°C to 100°C. Applications requiring full -55°C operation must use EL357N(TA)-VG or HCPL-181 series. Applications requiring operation above 100°C must use EL357N(TA)-VG or onsemi FODM series.

Packaging and Supply Format:

EL357N(TA)-VG is supplied in Tape & Reel format. onsemi FODM121 variants are available in Tube, Tape & Reel, or Cut Tape & Digi-Reel formats. Broadcom HCPL-181 variants are supplied in Cut Tape & Digi-Reel format. Selection should match manufacturing assembly requirements and inventory management practices.

Compliance and Certification:

All listed substitute parts are RoHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. All parts are classified under ECCN EAR99 and HTSUS 8541.49.8000. All parts are active products in current production.

Frequently Asked Questions (FAQ)

Q: Can FODM121 be used as a direct replacement for EL357N(TA)-VG?

A: FODM121 meets all primary substitution criteria: 3750Vrms isolation, transistor output, DC input, single channel, 4-SMD gull wing package, and surface mount configuration. However, FODM121 has a lower minimum operating temperature (-40°C vs -55°C) and higher Vce saturation (400mV vs 200mV). Applications operating below -40°C or requiring lower saturation voltage must use EL357N(TA)-VG or HCPL-181-000E.

Q: What is the difference between FODM121AR2 and FODM121CR2?

A: Both parts are supplied in Tape & Reel format with identical electrical specifications except for current transfer ratio. FODM121AR2 has CTR of 100% to 300% @ 5mA, while FODM121CR2 has CTR of 100% to 200% @ 5mA. Both provide 80mA output current and 400mV Vce saturation. Selection depends on the specific current transfer ratio requirement of the application.

Q: Why does HCPL-181-000E have a different package designation (4-SOIC) compared to EL357N(TA)-VG (4-SOP)?

A: HCPL-181-000E uses a 4-SOIC (0.209", 5.30mm Width) package, while EL357N(TA)-VG uses a 4-SOP (2.54mm) package. Both are 4-pin surface mount configurations with gull wing leads, but the physical footprints differ. PCB layout and land pattern design must be verified before substitution.

Q: Can FODM124R2 be used in place of EL357N(TA)-VG?

A: FODM124R2 meets all primary substitution criteria and provides higher output current (80mA vs 50mA). However, FODM124R2 has significantly different current transfer ratio specifications (100% to 1200% @ 1mA vs 50% to 600% @ 5mA). This part is designed for low-input-current applications and should only be used if the application circuit is compatible with these higher CTR values.

Q: What is the impact of Vce saturation differences between substitute parts?

A: EL357N(TA)-VG and HCPL-181-000E have 200mV maximum Vce saturation, while onsemi FODM series parts have 400mV maximum. Lower saturation voltage results in lower output voltage drop and reduced power dissipation in the transistor output stage. Applications with tight output voltage margins or high-frequency switching should prioritize parts with lower saturation voltage.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. All parts also carry MSL 1 (Unlimited) moisture sensitivity ratings, indicating no special moisture control requirements during storage or handling.

Q: What packaging formats are available for substitutes?

A: EL357N(TA)-VG is supplied in Tape & Reel. onsemi FODM121 variants are available in Tube, Tape & Reel, or Cut Tape & Digi-Reel formats depending on part number suffix. Broadcom HCPL-181 variants are supplied in Cut Tape & Digi-Reel format. Manufacturing process requirements should determine packaging selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message