EL357NA(TB)-VG Equivalent & Substitute Parts

Part Overview

The EL357NA(TB)-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 status with 1022 pieces currently in stock. Substitute parts are identified based on matching isolation voltage, output type, channel configuration, and package compatibility to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value
Isolation Voltage	3750Vrms
Number of Channels	1
Output Type	Transistor
Input Type	DC
Maximum Output Voltage	80V
Maximum Output Current	50mA
Package Type	4-SOP (2.54mm)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C to 110°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the EL357NA(TB)-VG are qualified based on the following critical parameters:

Primary Matching Criteria:

Isolation voltage of 3750Vrms
Single channel configuration
Transistor output topology
DC input type
Maximum output voltage of 80V
Surface mount technology
ROHS3 compliance

Secondary Compatibility Factors:

Current transfer ratio ranges (determines signal integrity)
Output current capability (50mA minimum for direct substitution)
Vce saturation characteristics (affects switching performance)
Rise and fall time specifications (3µs to 4µs acceptable range)
Operating temperature overlap with -55°C to 110°C range
Package form factor (4-SOP, 4-SMD, or 4-SOIC variants)

Substitutes are grouped by manufacturer and packaging configuration. Parts with higher current output capability (80mA) or different current transfer ratio ranges remain functionally compatible when circuit design accommodates these parameter variations.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	Channels	Output Type	Max Output Current	Vce Sat (Max)	Operating Temp	Package	Packaging Type
EL357NA(TB)-VG	Everlight Electronics	3750Vrms	1	Transistor	50mA	200mV	-55°C to 110°C	4-SOP	Tube
FODM121	onsemi	3750Vrms	1	Transistor	80mA	400mV	-40°C to 110°C	4-SMD	Tube
FODM121AR2	onsemi	3750Vrms	1	Transistor	80mA	400mV	-40°C to 110°C	4-SMD	Tape & Reel
FODM121B	onsemi	3750Vrms	1	Transistor	80mA	400mV	-40°C to 110°C	4-SMD	Tube
FODM121C	onsemi	3750Vrms	1	Transistor	80mA	400mV	-40°C to 110°C	4-SMD	Tube
FODM121CR2	onsemi	3750Vrms	1	Transistor	80mA	400mV	-40°C to 110°C	4-SMD	Tape & Reel
FODM121R2	onsemi	3750Vrms	1	Transistor	80mA	400mV	-40°C to 110°C	4-SMD	Tape & Reel
FODM124R2	onsemi	3750Vrms	1	Transistor	80mA	400mV	-40°C to 110°C	4-SMD	Cut Tape & Digi-Reel
HCPL-181-000E	Broadcom Limited	3750Vrms	1	Transistor	50mA	200mV	-55°C to 100°C	4-SOIC	Cut Tape & Digi-Reel
HCPL-181-00AE	Broadcom Limited	3750Vrms	1	Transistor	50mA	200mV	-55°C to 100°C	4-Mini-Flat	Cut Tape & Digi-Reel
HCPL-181-00BE	Broadcom Limited	3750Vrms	1	Transistor	50mA	200mV	-55°C to 100°C	4-Mini-Flat	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

HCPL-181-000E, HCPL-181-00AE, and HCPL-181-00BE from Broadcom Limited maintain identical electrical specifications to the EL357NA(TB)-VG including 50mA output current and 200mV Vce saturation. These parts are ROHS3 compliant and MSL 1 rated. The primary difference is package form factor (4-SOIC or 4-Mini-Flat versus 4-SOP) and operating temperature maximum of 100°C versus 110°C. These substitutes are suitable for applications where PCB layout accommodates the alternative package geometry.

Compatible Substitutes (Parameter Variations):

FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, FODM121R2, and FODM124R2 from onsemi provide 3750Vrms isolation with transistor output in 4-SMD packages. These parts feature 80mA output current capability and 400mV Vce saturation, representing higher output drive capability. Operating temperature range is -40°C to 110°C, which covers the primary operating window but does not extend to -55°C. All onsemi variants are ROHS3 compliant and MSL 1 rated. Current transfer ratio specifications vary by part grade (B, C, R2 variants), affecting signal gain characteristics.

Selection Criteria:

Use Broadcom HCPL-181 series when package footprint compatibility with 4-SOIC or 4-Mini-Flat is available and -55°C minimum temperature is required
Use onsemi FODM121 series when higher output current (80mA) is beneficial and minimum operating temperature of -40°C is acceptable
Verify PCB layout and thermal design accommodate package-specific dimensions
Confirm current transfer ratio requirements match the selected part grade

All listed substitutes maintain ROHS3 compliance and unlimited moisture sensitivity rating, ensuring regulatory and manufacturing process compatibility.

Frequently Asked Questions (FAQ)

Q: Can FODM121 variants directly replace EL357NA(TB)-VG without circuit modification?

A: FODM121 variants are functionally compatible for applications where the operating temperature minimum of -40°C is acceptable and the higher Vce saturation (400mV versus 200mV) does not degrade circuit performance. The increased output current capability (80mA versus 50mA) is a design advantage. PCB layout must accommodate the 4-SMD package footprint.

Q: What is the difference between FODM121, FODM121B, and FODM121C?

A: These parts differ in current transfer ratio specifications. FODM121 provides 50% to 600% CTR at 5mA. FODM121B provides 50% to 150% CTR at 5mA. FODM121C provides 100% to 200% CTR at 5mA. Selection depends on required signal gain and circuit design margins.

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

A: Both parts share identical electrical specifications and package type (4-Mini-Flat). The difference is current transfer ratio: HCPL-181-00AE provides 80% to 160% CTR at 5mA, while HCPL-181-00BE provides 130% to 260% CTR at 5mA. Selection is based on required signal gain.

Q: What is the significance of "R2" and "AR2" suffixes in onsemi part numbers?

A: These suffixes indicate packaging format. "R2" denotes Tape & Reel packaging, while "AR2" also denotes Tape & Reel with specific reel specifications. "CR2" indicates Tape & Reel format for the C-grade variant. These are packaging variants of the same electrical part and are interchangeable electrically.

Q: Can I use HCPL-181-000E if my application requires -55°C operation?

A: HCPL-181-000E is rated to -55°C minimum, making it suitable for low-temperature applications. However, its maximum operating temperature is 100°C versus 110°C for the EL357NA(TB)-VG. Verify that your application does not require operation above 100°C.

Q: What are the package footprint differences between 4-SOP, 4-SMD, 4-SOIC, and 4-Mini-Flat?

A: 4-SOP (2.54mm) and 4-SMD are similar gull-wing surface mount packages with different pitch specifications. 4-SOIC (0.209", 5.30mm width) is a standard SOIC package with wider body. 4-Mini-Flat is a compact surface mount package. PCB layout and reflow profile compatibility must be verified for each package type.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the EL357NA(TB)-VG.

Q: Which substitute has the highest current output capability?

A: FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, FODM121R2, and FODM124R2 all provide 80mA maximum output current, compared to 50mA for the EL357NA(TB)-VG and Broadcom HCPL-181 series.

Q: What is the difference between FODM121R2 and FODM124R2?

A: Both are onsemi optoisolators with 3750Vrms isolation in 4-SMD packages. FODM121R2 provides 50% to 600% CTR at 5mA input. FODM124R2 provides 100% to 1200% CTR at 1mA input, indicating significantly higher current transfer ratio at lower input current. FODM124R2 is suitable for applications requiring high gain at minimal input drive.

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