EL357NE(TA)-G Equivalent & Substitute Parts

Part Overview

The EL357NE(TA)-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. Equivalent and substitute parts are identified based on matching electrical isolation ratings, output type, channel configuration, and mechanical compatibility to enable direct functional replacement in circuit applications.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the EL357NE(TA)-G are selected 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)
Input Type: DC (mandatory)
Voltage - Output (Max): 80V (mandatory)
Mounting Type: Surface Mount (mandatory)

Secondary Compatibility Factors:

Current - Output / Channel: 50mA or higher
Operating Temperature Range: Must encompass or overlap with -55°C ~ 110°C
Package / Case: 4-SMD Gull Wing or equivalent surface mount 4-pin configurations
RoHS3 Compliance and MSL rating

Substitute parts are grouped into two categories: direct pin-compatible replacements with identical or superior electrical ratings, and functionally equivalent alternatives with different package styles that maintain electrical performance within specified parameters.

Parameter Comparison

Parameter	EL357NE(TA)-G	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
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC
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
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 with Identical Package:

HCPL-181-00AE and HCPL-181-00BE from Broadcom Limited are direct substitutes with 4-SMD Gull Wing packaging matching the EL357NE(TA)-G. Both maintain 3750Vrms isolation, single-channel transistor output, and 50mA output current. These parts are RoHS3 compliant with MSL 1 rating. The HCPL-181-00BE offers higher current transfer ratio (130%-260% @ 5mA) compared to the EL357NE(TA)-G (100%-200% @ 5mA), providing improved performance margin. Operating temperature range is -55°C ~ 100°C, which covers the primary operating window of the original part.

Alternative Substitutes with Enhanced Current Capability:

FODM121 series from onsemi provides 3750Vrms isolation with 80mA output current capability, exceeding the 50mA specification of the EL357NE(TA)-G. FODM121C and FODM121CR2 offer current transfer ratios of 100%-200% @ 5mA, matching the original part's performance band. These parts feature 4-SMD Gull Wing packaging and are RoHS3 compliant with MSL 1 rating. Operating temperature range is -40°C ~ 110°C. The higher output current rating provides design flexibility for applications requiring increased output drive capability.

High Current Transfer Ratio Alternative:

FODM124R2 from onsemi provides 3750Vrms isolation with 80mA output current and significantly higher current transfer ratio (100%-1200% @ 1mA). This part is suitable for applications requiring enhanced optical coupling efficiency at lower input currents. RoHS3 compliant with MSL 1 rating and -40°C ~ 110°C operating temperature range.

Package Variant Consideration:

HCPL-181-000E from Broadcom Limited uses 4-SOIC packaging instead of 4-SMD Gull Wing. This part maintains electrical equivalence with 3750Vrms isolation, 50mA output current, and 200mV Vce saturation matching the original specification. Package footprint differs and requires PCB layout modification. RoHS3 compliant with MSL 1 rating and -55°C ~ 100°C operating temperature range.

All substitute parts listed maintain RoHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can FODM121 series parts directly replace EL357NE(TA)-G in existing PCB layouts?

A: FODM121 series parts feature identical 4-SMD Gull Wing packaging and pin configuration as the EL357NE(TA)-G, enabling direct PCB footprint compatibility. Electrical parameters including 3750Vrms isolation voltage, single-channel transistor output, and 80V maximum output voltage are equivalent. The higher 80mA output current rating of FODM121 series does not create compatibility issues in circuits designed for 50mA operation.

Q: What is the difference between FODM121C and FODM121CR2?

A: FODM121C is supplied in Tube packaging, while FODM121CR2 is supplied in Tape & Reel (TR) format. Both parts are electrically identical with 100%-200% current transfer ratio @ 5mA, 3750Vrms isolation, and 4-SMD Gull Wing packaging. Selection between these variants depends on procurement and assembly process requirements rather than electrical performance.

Q: Are HCPL-181-00AE and HCPL-181-00BE interchangeable?

A: Both parts feature identical 4-SMD Gull Wing packaging and 3750Vrms isolation voltage. The primary difference is current transfer ratio specification: HCPL-181-00AE provides 80%-160% @ 5mA, while HCPL-181-00BE provides 130%-260% @ 5mA. Both are suitable substitutes for EL357NE(TA)-G (100%-200% @ 5mA). Selection depends on whether the higher transfer ratio of HCPL-181-00BE provides design margin for the specific application.

Q: Why does HCPL-181-000E use different packaging than other substitutes?

A: HCPL-181-000E uses 4-SOIC (0.209", 5.30mm Width) packaging instead of 4-SMD Gull Wing. This represents a different package family from the same manufacturer. While electrically equivalent to EL357NE(TA)-G, this part requires PCB layout modification and cannot be used as a direct drop-in replacement without redesign.

Q: What is the significance of the operating temperature range difference between substitutes?

A: EL357NE(TA)-G operates from -55°C ~ 110°C. FODM121 series operates from -40°C ~ 110°C, and HCPL-181 series operates from -55°C ~ 100°C. For applications requiring full -55°C operation, HCPL-181 series or EL357NE(TA)-G are required. For applications requiring operation above 100°C, FODM121 series or EL357NE(TA)-G are required. Applications operating within -40°C ~ 100°C range can use any substitute listed.

Q: Does higher current transfer ratio in FODM124R2 affect circuit operation?

A: FODM124R2 provides 100%-1200% current transfer ratio @ 1mA, significantly higher than EL357NE(TA)-G (100%-200% @ 5mA). Higher current transfer ratio indicates more efficient optical coupling at lower input currents. This does not create compatibility issues in circuits designed for the original part; it provides improved performance margin and may enable operation at lower input drive currents.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed in this reference are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance status of EL357NE(TA)-G. This ensures compatibility with standard manufacturing processes and storage requirements without additional handling precautions.

Q: What is the practical difference between Vce saturation of 200mV (EL357NE(TA)-G and HCPL-181 series) versus 400mV (FODM121 series)?

A: Vce saturation represents the collector-emitter voltage when the transistor output is fully saturated. Lower saturation voltage (200mV) results in lower power dissipation in the output transistor. For applications with tight power budget or high-frequency switching, the 200mV saturation of HCPL-181 series or EL357NE(TA)-G may be preferred. For general-purpose applications, the 400mV saturation of FODM121 series is acceptable and does not create functional issues.

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