EL357NC-G Equivalent & Substitute Parts

Part Overview

The EL357NC-G 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 when equivalent electrical performance and mechanical compatibility can be maintained across the isolation voltage, output current capacity, and thermal operating range specifications.

Key Parameters

Parameter	Value
Isolation Voltage	3750Vrms
Number of Channels	1
Output Type	Transistor
Current Transfer Ratio (Min)	200% @ 5mA
Current Transfer Ratio (Max)	400% @ 5mA
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Vce Saturation (Max)	200mV
Operating Temperature	-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 optoisolators for the EL357NC-G are selected based on the following critical parameters:

Mandatory Equivalence Criteria:

Isolation voltage of 3750Vrms
Single channel configuration
Transistor output type
DC input type
Surface mount gull wing package format
RoHS3 compliance

Performance Compatibility Parameters:

Maximum output voltage of 80V
Output current capacity of 50mA or greater
Operating temperature range that encompasses or exceeds -55°C to 110°C
Current transfer ratio specifications that satisfy application requirements

Substitute parts are grouped by manufacturer and packaging variant. onsemi FODM121 series variants and Broadcom HCPL-181 series variants meet the core isolation and package requirements. Differences in current transfer ratio ranges, saturation voltage, and packaging format (tube, tape & reel, cut tape) allow selection based on specific application needs and inventory availability.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	CTR Min @ 5mA	CTR Max @ 5mA	Output Current	Vce Sat (Max)	Temp Range	Package	Packaging Type
EL357NC-G	Everlight Electronics	3750Vrms	200%	400%	50mA	200mV	-55°C ~ 110°C	4-SOP (2.54mm)	Surface Mount
FODM121	onsemi	3750Vrms	50%	600%	80mA	400mV	-40°C ~ 110°C	4-SMD	Tube
FODM121AR2	onsemi	3750Vrms	100%	300%	80mA	400mV	-40°C ~ 110°C	4-SMD	Tape & Reel (TR)
FODM121B	onsemi	3750Vrms	50%	150%	80mA	400mV	-40°C ~ 110°C	4-SMD	Tube
FODM121C	onsemi	3750Vrms	100%	200%	80mA	400mV	-40°C ~ 110°C	4-SMD	Tube
FODM121CR2	onsemi	3750Vrms	100%	200%	80mA	400mV	-40°C ~ 110°C	4-SMD	Tape & Reel (TR)
FODM121R2	onsemi	3750Vrms	50%	600%	80mA	400mV	-40°C ~ 110°C	4-SMD	Tape & Reel (TR)
FODM124R2	onsemi	3750Vrms	100% @ 1mA	1200% @ 1mA	80mA	400mV	-40°C ~ 110°C	4-SMD	Cut Tape (CT) & Digi-Reel®
HCPL-181-000E	Broadcom Limited	3750Vrms	50%	600%	50mA	200mV	-55°C ~ 100°C	4-SOIC (0.209", 5.30mm Width)	Cut Tape (CT) & Digi-Reel®
HCPL-181-00AE	Broadcom Limited	3750Vrms	80%	160%	50mA	200mV	-55°C ~ 100°C	4-Mini-Flat	Cut Tape (CT) & Digi-Reel®
HCPL-181-00BE	Broadcom Limited	3750Vrms	130%	260%	50mA	200mV	-55°C ~ 100°C	4-Mini-Flat	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Broadcom HCPL-181 Series: The HCPL-181-000E maintains identical output current (50mA) and saturation voltage (200mV) specifications as the EL357NC-G. This part is suitable for applications requiring direct electrical equivalence. The HCPL-181-00AE and HCPL-181-00BE variants provide alternative current transfer ratio ranges within the same electrical performance envelope. All HCPL-181 variants are RoHS3 compliant and Active product status. Operating temperature range extends to -55°C but maximum is 100°C, which is 10°C lower than the EL357NC-G.

onsemi FODM121 Series: The FODM121 family provides higher output current capacity (80mA) compared to the EL357NC-G (50mA). Multiple current transfer ratio grades are available: FODM121B (50-150%), FODM121C (100-200%), FODM121AR2 (100-300%), FODM121 (50-600%), and FODM121R2 (50-600%). All variants maintain 3750Vrms isolation and are RoHS3 compliant with Active status. Operating temperature range is -40°C to 110°C, with minimum temperature 15°C higher than the EL357NC-G. Saturation voltage is 400mV, which is higher than the EL357NC-G specification of 200mV.

onsemi FODM124R2: This variant offers the highest current transfer ratio range (100-1200% @ 1mA) and is specified at 1mA input current rather than 5mA. Output current capacity is 80mA. This part is suitable for applications requiring high current transfer efficiency at lower input drive levels. RoHS3 compliant and Active status.

Packaging Considerations: onsemi FODM121 variants are available in tube, tape & reel, and cut tape formats. Broadcom HCPL-181 variants are supplied in cut tape & Digi-Reel format. Package format selection depends on assembly process requirements and volume needs.

Frequently Asked Questions (FAQ)

Q: Can FODM121 series parts directly replace the EL357NC-G?

A: FODM121 series parts maintain the same 3750Vrms isolation voltage, single-channel transistor output, and surface mount gull wing package format. However, three differences exist: (1) output current is 80mA versus 50mA on the EL357NC-G, (2) saturation voltage is 400mV versus 200mV, and (3) minimum operating temperature is -40°C versus -55°C. Applications operating above -40°C and tolerating higher saturation voltage can use FODM121 variants.

Q: What is the difference between FODM121C and FODM121AR2?

A: Both parts maintain identical isolation voltage, output current, and saturation voltage. FODM121C has a current transfer ratio range of 100-200% at 5mA input, while FODM121AR2 ranges from 100-300% at 5mA input. FODM121C is available in tube packaging, while FODM121AR2 is supplied in tape & reel format. Selection depends on the required current transfer ratio range and packaging preference.

Q: Is the HCPL-181-000E equivalent to the EL357NC-G?

A: The HCPL-181-000E matches the EL357NC-G in isolation voltage (3750Vrms), output current (50mA), and saturation voltage (200mV). Both are RoHS3 compliant and Active status. The primary difference is the maximum operating temperature: HCPL-181-000E is rated to 100°C while EL357NC-G extends to 110°C. For applications operating below 100°C, the HCPL-181-000E provides direct electrical equivalence.

Q: Why do HCPL-181-00AE and HCPL-181-00BE use different package designations than HCPL-181-000E?

A: HCPL-181-000E uses 4-SOIC (0.209", 5.30mm Width) package, while HCPL-181-00AE and HCPL-181-00BE use 4-Mini-Flat package. Both are surface mount gull wing formats with different physical dimensions. Package selection depends on PCB layout constraints and assembly equipment compatibility.

Q: Can FODM124R2 be used instead of FODM121 variants?

A: FODM124R2 maintains the same isolation voltage, output current, and saturation voltage as FODM121 variants. The key difference is the current transfer ratio specification: FODM124R2 is rated at 100-1200% @ 1mA input current, while FODM121 variants are rated at 5mA input current. FODM124R2 is suitable for applications requiring high current transfer efficiency at lower input drive levels.

Q: What packaging formats are available for onsemi FODM121 series?

A: onsemi FODM121 series is available in three packaging formats: (1) Tube—FODM121, FODM121B, FODM121C, (2) Tape & Reel (TR)—FODM121AR2, FODM121R2, FODM121CR2, and (3) Cut Tape (CT) & Digi-Reel—FODM124R2. Selection depends on assembly volume and process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant and maintain Active product status, matching the compliance profile of the EL357NC-G.

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