EL357NA-VG Equivalent & Substitute Parts

Part Overview

The EL357NA-VG is an optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides 3750Vrms isolation voltage in a single-channel configuration with 4-SOP surface mount packaging. The device is classified as Active product status and is RoHS3 compliant. Substitute parts are identified based on matching electrical specifications, isolation voltage ratings, output type, and mechanical compatibility to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Number of Channels	1
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Vce Saturation (Max)	200mV
Operating Temperature Range	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Input Type	DC
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the EL357NA-VG are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Voltage - Isolation: 3750Vrms (mandatory)
Number of Channels: 1 (mandatory)
Output Type: Transistor (mandatory)
Voltage - Output (Max): 80V (mandatory)
Input Type: DC (mandatory)
Mounting Type: Surface Mount (mandatory)
RoHS Status: ROHS3 Compliant (mandatory)

Secondary Compatibility Factors:

Current - Output / Channel: 50mA or higher
Vce Saturation (Max): 200mV or lower
Operating Temperature Range: Must encompass or match the application requirement
Package / Case: 4-SMD, Gull Wing or equivalent surface mount configurations

All substitute parts listed meet the primary matching criteria. Variations in Current Transfer Ratio, rise/fall times, and specific packaging formats (Tube, Tape & Reel, Cut Tape) do not affect functional substitution but may impact procurement and assembly workflows.

Parameter Comparison

Parameter	EL357NA-VG	FODM121	FODM121AR2	FODM121B	FODM121C	FODM121CR2	FODM121R2	FODM124R2	HCPL-181-000E	HCPL-181-00AE	HCPL-181-00BE
Manufacturer	Everlight Electronics	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	Broadcom Limited	Broadcom Limited	Broadcom Limited
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1	1	1	1	1	1	1	1
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V	80V
Current - Output / Channel	50mA	80mA	80mA	80mA	80mA	80mA	80mA	80mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.2V	1.3V (Max)	1.3V (Max)	1.3V (Max)	1.3V (Max)	1.3V (Max)	1.3V (Max)	1.3V (Max)	1.2V	1.2V	1.2V
Current - DC Forward (If) (Max)	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
Vce Saturation (Max)	200mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	200mV	200mV	200mV
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC
Operating Temperature	-55°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-40°C ~ 110°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°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-SOIC (0.209", 5.30mm Width)	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
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)

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

The HCPL-181-00AE and HCPL-181-00BE from Broadcom Limited are direct substitutes for the EL357NA-VG. Both devices maintain identical isolation voltage (3750Vrms), output current (50mA), Vce saturation (200mV), and operating temperature range (-55°C ~ 100°C). These parts are ROHS3 compliant with MSL 1 rating. The HCPL-181-00BE offers a higher Current Transfer Ratio range (130% to 260% @ 5mA) compared to the EL357NA-VG (80% to 160% @ 5mA), providing enhanced performance margin in applications requiring stable gain characteristics.

Compatible Substitutes (Functional Equivalence with Parameter Variations):

The onsemi FODM121 series (FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, FODM121R2) and FODM124R2 are functionally equivalent substitutes. These devices maintain the 3750Vrms isolation voltage, single-channel transistor output, and 80V maximum output voltage. Key differences include:

Output current capability: 80mA (versus 50mA for EL357NA-VG), providing additional current margin
Vce saturation: 400mV (versus 200mV for EL357NA-VG), acceptable for most applications but with reduced saturation performance
Operating temperature range: -40°C ~ 110°C (versus -55°C ~ 110°C for EL357NA-VG), suitable for standard industrial applications but with reduced low-temperature capability
Current Transfer Ratio variations: FODM121 variants offer ranges from 50% to 600% @ 5mA, with FODM124R2 providing 100% to 1200% @ 1mA for high-gain applications

All substitute parts are ROHS3 compliant with MSL 1 rating and Active product status.

Packaging Considerations:

The EL357NA-VG is supplied in 4-SOP (2.54mm) packaging. The HCPL-181-000E uses 4-SOIC (0.209", 5.30mm Width) packaging, which differs in footprint and may require PCB layout modifications. The HCPL-181-00AE and HCPL-181-00BE use 4-Mini-Flat packaging. The onsemi FODM121 series uses 4-SMD packaging. Packaging format selection depends on PCB design constraints and assembly capabilities.

Frequently Asked Questions (FAQ)

Q: Can the FODM121 series replace the EL357NA-VG in all applications?

A: The FODM121 series is functionally equivalent for applications where the output current requirement does not exceed 50mA and Vce saturation of 400mV is acceptable. The higher output current capability (80mA) of FODM121 variants provides additional design margin. However, applications requiring Vce saturation of 200mV or lower should use HCPL-181-00AE or HCPL-181-00BE instead.

Q: What is the difference between FODM121 and FODM124R2?

A: Both devices maintain 3750Vrms isolation and 80V maximum output voltage. The primary difference is the Current Transfer Ratio specification: FODM121 variants are specified at 5mA input current with ratios ranging from 50% to 600%, while FODM124R2 is specified at 1mA input current with a ratio of 100% to 1200%. FODM124R2 is suitable for applications requiring higher gain at lower input currents.

Q: Are there temperature range limitations when substituting the EL357NA-VG?

A: The EL357NA-VG operates from -55°C to 110°C. The onsemi FODM121 series operates from -40°C to 110°C, which is acceptable for most industrial applications but does not support the full low-temperature range. The HCPL-181 series from Broadcom operates from -55°C to 100°C, which covers the low-temperature requirement but has a reduced upper temperature limit of 100°C versus 110°C. Application temperature requirements must be verified before substitution.

Q: What packaging options are available for substitutes?

A: The EL357NA-VG is supplied in 4-SOP (2.54mm) packaging. Substitute parts are available in multiple packaging formats: HCPL-181-00AE and HCPL-181-00BE use 4-Mini-Flat; HCPL-181-000E uses 4-SOIC; onsemi FODM121 variants are available in Tube, Tape & Reel (TR), and Cut Tape (CT) formats. Packaging selection depends on procurement requirements and assembly processes.

Q: Is the EL357NA-VG RoHS compliant?

A: Yes, the EL357NA-VG is ROHS3 compliant. All listed substitute parts are also ROHS3 compliant, ensuring compatibility with RoHS-regulated applications and supply chains.

Q: What is the Moisture Sensitivity Level (MSL) for these optoisolators?

A: The EL357NA-VG and all substitute parts have MSL 1 (Unlimited), indicating no moisture sensitivity limitations. These components do not require special moisture control during storage, handling, or assembly.

Q: Can HCPL-181-000E be used as a direct replacement for EL357NA-VG?

A: The HCPL-181-000E is functionally equivalent but uses 4-SOIC (0.209", 5.30mm Width) packaging instead of 4-SOP (2.54mm). This packaging difference requires PCB footprint modification. Electrical specifications are compatible, with identical isolation voltage, output current, and Vce saturation. The operating temperature range is -55°C to 100°C, which covers the low-temperature requirement but has a 10°C reduction at the upper limit.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) Voltage - Isolation: 3750Vrms, (2) Number of Channels: 1, (3) Output Type: Transistor, (4) Voltage - Output (Max): 80V, (5) Input Type: DC, (6) Mounting Type: Surface Mount, and (7) RoHS Status: ROHS3 Compliant. Secondary factors include output current capability, Vce saturation, and operating temperature range, which may vary between substitutes but do not prevent functional equivalence.

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