EL357NA(TA)-VG Equivalent & Substitute Parts

Part Overview

The EL357NA(TA)-VG is an optoisolator with transistor output manufactured by Everlight Electronics Co Ltd. This component provides 3750Vrms isolation voltage in a 4-SOP (2.54mm) surface mount package, designed for DC input applications requiring galvanic isolation. The part is active and in production with 932 pieces currently in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for components with equivalent or superior electrical characteristics within the same functional category.

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
Operating Temperature Range	-55°C to 110°C
Mounting Type	Surface Mount
Package Type	4-SMD, Gull Wing
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the EL357NA(TA)-VG is determined by 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 gull wing package format
ROHS3 compliance
Moisture sensitivity level 1

Secondary Compatibility Factors:

Current transfer ratio specifications (may vary within acceptable ranges)
Output current capability (minimum 50mA required)
Forward voltage characteristics
Saturation voltage performance
Operating temperature range (minimum -55°C to 110°C or equivalent)
Rise and fall time parameters

Substitute parts are grouped by packaging format (4-SOP, 4-SMD, 4-SOIC, 4-Mini-Flat) and current transfer ratio classifications. Parts from onsemi (FODM series) and Broadcom Limited (HCPL-181 series) meet the core isolation and output specifications while offering variations in current transfer ratio ranges and output current capabilities.

Parameter Comparison

Parameter	EL357NA(TA)-VG	FODM121	FODM121AR2	FODM121B	FODM121C	FODM121CR2	FODM121R2	FODM124	FODM124R2	HCPL-181-000E	HCPL-181-00AE
Manufacturer	Everlight	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	Broadcom	Broadcom
Isolation Voltage	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
CTR Min @ 5mA	80%	50%	100%	50%	100%	100%	50%	N/A	N/A	50%	80%
CTR Max @ 5mA	160%	600%	300%	150%	200%	200%	600%	N/A	N/A	600%	160%
CTR @ 1mA	N/A	N/A	N/A	N/A	N/A	N/A	N/A	100-1200%	100-1200%	N/A	N/A
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	80mA	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)	1.3V (Max)	1.2V	1.2V
Vce Saturation (Max)	200mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	200mV	200mV
Rise / Fall Time (Typ)	3µs, 4µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	4µs, 3µs	4µs, 3µs
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	-40°C ~ 110°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-SMD, Gull Wing	4-SOIC (0.209", 5.30mm Width)	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	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 Format:

HCPL-181-00AE (Broadcom Limited) provides the closest electrical match to the EL357NA(TA)-VG. Both components share identical current transfer ratio specifications (80% to 160% @ 5mA), matching saturation voltage (200mV), and equivalent forward voltage (1.2V). The HCPL-181-00AE maintains the 4-SMD gull wing package format and is ROHS3 compliant with MSL 1 rating. The primary difference is the operating temperature range, which extends to -55°C but only to 100°C maximum, compared to the EL357NA(TA)-VG range of -55°C to 110°C.

Alternative Substitutes with Enhanced Output Current:

The onsemi FODM121 series (FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, FODM121R2) and FODM124 series provide 80mA output current capability, exceeding the 50mA specification of the primary part. These components maintain 3750Vrms isolation voltage and 4-SMD gull wing package format. Current transfer ratio specifications vary across the FODM121 variants, with FODM121AR2 and FODM121C offering 100% to 300% and 100% to 200% ranges respectively, providing tighter specifications than the broader ranges of other variants. FODM124 and FODM124R2 feature significantly higher current transfer ratios (100% to 1200% @ 1mA) and are suitable for applications requiring enhanced sensitivity.

All onsemi substitutes operate at -40°C to 110°C, which covers the upper temperature range of the primary part but does not extend to -55°C minimum. All listed substitutes are ROHS3 compliant with MSL 1 rating.

Package Format Consideration:

HCPL-181-000E (Broadcom Limited) uses a 4-SOIC package format instead of the 4-SMD gull wing configuration. This part matches the electrical specifications of the EL357NA(TA)-VG (80% to 160% CTR @ 5mA, 200mV saturation voltage, 1.2V forward voltage) but requires different PCB footprint and assembly considerations.

Compliance and Availability:

All listed substitute parts maintain ROHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols. Inventory levels vary significantly, with FODM121CR2 offering 66,880 pieces and HCPL-181-000E offering 47,300 pieces, providing substantial supply availability compared to the 932 pieces of the primary part.

Frequently Asked Questions (FAQ)

Q: Can FODM121 series parts directly replace the EL357NA(TA)-VG in existing designs?

A: FODM121 series parts are electrically compatible for applications where the 3750Vrms isolation voltage, single-channel transistor output, and 80V maximum output voltage are required. The 4-SMD gull wing package format is identical, allowing direct PCB footprint compatibility. However, the higher saturation voltage (400mV versus 200mV) and forward voltage (1.3V maximum versus 1.2V typical) may affect circuit performance in applications with tight voltage margins. The reduced output current capability of the primary part (50mA) is exceeded by FODM121 variants (80mA), providing additional design margin.

Q: What is the significance of current transfer ratio (CTR) variations among substitute parts?

A: Current transfer ratio determines the output current produced for a given input current. The EL357NA(TA)-VG specifies 80% to 160% CTR @ 5mA. FODM121AR2 and FODM121C offer narrower ranges (100% to 300% and 100% to 200% respectively), providing more predictable output characteristics. FODM121, FODM121B, and FODM121R2 specify broader ranges (50% to 600%), which may require additional circuit compensation but offer greater manufacturing tolerance. FODM124 and FODM124R2 measure CTR at 1mA input current with significantly higher ratios (100% to 1200%), making them suitable for low-input-current applications.

Q: Are there temperature range limitations when substituting with onsemi FODM parts?

A: Yes. The EL357NA(TA)-VG operates from -55°C to 110°C, while all onsemi FODM series parts operate from -40°C to 110°C. Applications requiring operation below -40°C must use the primary part or the Broadcom HCPL-181-00AE or HCPL-181-000E, which both support -55°C minimum temperature. Applications operating only within the -40°C to 110°C range can use FODM series substitutes without temperature-related restrictions.

Q: What packaging format differences exist among the substitute options?

A: The EL357NA(TA)-VG uses a 4-SOP (2.54mm) package. Most substitute parts use 4-SMD gull wing format, which is mechanically compatible with the same PCB footprint. HCPL-181-000E uses a 4-SOIC (0.209", 5.30mm Width) package, requiring a different PCB footprint and assembly process. Packaging variants within the onsemi FODM series include Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel® formats, which affect supply chain and manufacturing handling but not electrical compatibility.

Q: How do saturation voltage differences affect circuit design?

A: The EL357NA(TA)-VG specifies 200mV maximum saturation voltage, while onsemi FODM series parts specify 400mV. In switching applications, higher saturation voltage results in greater voltage drop across the output transistor, reducing the voltage available to the load. Broadcom HCPL-181 series parts maintain 200mV saturation voltage matching the primary part. Applications with tight output voltage specifications or high-impedance loads should prioritize substitutes with lower saturation voltage specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the EL357NA(TA)-VG. This ensures compatibility with standard manufacturing processes and storage requirements without additional environmental controls.

Q: Which substitute offers the best overall compatibility with the EL357NA(TA)-VG?

A: HCPL-181-00AE provides the closest electrical match, with identical current transfer ratio (80% to 160% @ 5mA), saturation voltage (200mV), and forward voltage (1.2V) specifications. It maintains the 4-SMD gull wing package format and supports the full -55°C to 110°C temperature range except for the upper limit, which extends only to 100°C. For applications requiring full -55°C to 110°C operation, the primary part EL357NA(TA)-VG remains the only option among listed components.

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