EL357NF-VG Equivalent & Substitute Parts

Part Overview

The EL357NF-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 with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified based on matching core electrical and mechanical parameters: 3750Vrms isolation voltage, single-channel transistor output configuration, 80V maximum output voltage, surface mount gull wing packaging, and DC input type. Equivalent components maintain functional compatibility within specified parameter ranges while accommodating different Current Transfer Ratio specifications and packaging formats.

Key Parameters

Parameter	Value
Manufacturer Part Number	EL357NF-VG
Manufacturer	Everlight Electronics Co Ltd
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	3750Vrms
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Input Type	DC
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Operating Temperature	-55°C ~ 110°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Voltage - Isolation: 3750Vrms (all substitutes match)
Number of Channels: 1 (all substitutes match)
Output Type: Transistor (all substitutes match)
Voltage - Output (Max): 80V (all substitutes match)
Input Type: DC (all substitutes match)
Mounting Type: Surface Mount (all substitutes match)
Package / Case: 4-SMD, Gull Wing (all substitutes match)

Secondary Parameters (Variable Across Substitutes):

Current Transfer Ratio (Min/Max): Ranges from 50% to 1200% depending on part variant
Current - Output / Channel: 50mA (EL357NF-VG) or 80mA (onsemi FODM series and Broadcom HCPL-181 series)
Vce Saturation (Max): 200mV (EL357NF-VG and HCPL-181-000E) or 400mV (onsemi FODM series)
Operating Temperature: -55°C ~ 110°C (EL357NF-VG) or -40°C ~ 110°C (substitutes) or -55°C ~ 100°C (HCPL-181-000E)
Packaging Format: Tube, Tape & Reel (TR), or Cut Tape (CT) & Digi-Reel®

Substitutes are organized by manufacturer: onsemi FODM series variants, and Broadcom Limited HCPL-181 series variants. Each variant maintains the core isolation voltage, channel count, and output type while offering different Current Transfer Ratio specifications and packaging options.

Parameter Comparison

Parameter	EL357NF-VG	FODM121	FODM121AR2	FODM121B	FODM121C	FODM121CR2	FODM121R2	FODM124R2	HCPL-181-000E	HCPL-181-00AE	HCPL-181-00BE
Manufacturer	Everlight	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	onsemi	Broadcom	Broadcom	Broadcom
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
Current Transfer Ratio (Min) @ 5mA	150%	50%	100%	50%	100%	100%	50%	100% @ 1mA	50%	80%	130%
Current Transfer Ratio (Max) @ 5mA	300%	600%	300%	150%	200%	200%	600%	1200% @ 1mA	600%	160%	260%
Rise / Fall Time (Typ)	3µs, 4µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	3µs, 3µs	4µs, 3µs	4µs, 3µs	4µs, 3µs
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC	DC
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
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
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and RoHS3 compliance, ensuring regulatory alignment with the EL357NF-VG. Selection among substitutes depends on specific application requirements within the following categories:

onsemi FODM Series Substitutes: The FODM121 variants (FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, FODM121R2) and FODM124R2 provide higher output current capability (80mA versus 50mA) and are available in multiple packaging formats (Tube, Tape & Reel, Cut Tape & Digi-Reel). These components feature higher Vce Saturation (400mV maximum) and narrower operating temperature range (-40°C to 110°C). Current Transfer Ratio specifications vary across variants, ranging from 50% to 1200% depending on the specific part number. FODM124R2 offers the highest Current Transfer Ratio specification (100% to 1200% @ 1mA) and is available in Cut Tape & Digi-Reel packaging.

Broadcom Limited HCPL-181 Series Substitutes: The HCPL-181-000E, HCPL-181-00AE, and HCPL-181-00BE maintain the 50mA output current specification and 200mV Vce Saturation matching the EL357NF-VG. HCPL-181-000E operates across -55°C to 100°C and is available in Cut Tape & Digi-Reel packaging with 50% to 600% Current Transfer Ratio. HCPL-181-00AE and HCPL-181-00BE use 4-Mini-Flat packaging and operate from -55°C to 100°C with Current Transfer Ratio specifications of 80% to 160% and 130% to 260% respectively.

Package Considerations: The EL357NF-VG uses 4-SOP (2.54mm) packaging. onsemi FODM series components use 4-SMD packaging. Broadcom HCPL-181-000E uses 4-SOIC (0.209", 5.30mm Width) packaging. Broadcom HCPL-181-00AE and HCPL-181-00BE use 4-Mini-Flat packaging. Physical package differences require PCB layout verification before implementation.

Temperature Range Considerations: The EL357NF-VG operates from -55°C to 110°C. onsemi FODM series components operate from -40°C to 110°C, providing reduced low-temperature performance. Broadcom HCPL-181 series components operate from -55°C to 100°C, providing reduced high-temperature performance. Application temperature requirements determine suitability.

Frequently Asked Questions (FAQ)

Q: What are the core electrical parameters that define substitution compatibility for the EL357NF-VG?

A: The primary parameters are 3750Vrms isolation voltage, single-channel configuration, transistor output type, 80V maximum output voltage, and DC input type. All listed substitutes match these core specifications. Secondary parameters including Current Transfer Ratio, output current capability, Vce Saturation, and operating temperature range vary across substitutes and must be evaluated against specific application requirements.

Q: Can I use FODM121 variants as direct replacements for EL357NF-VG?

A: FODM121 variants provide functional equivalence in isolation voltage, channel count, output type, and maximum output voltage. However, differences exist: FODM121 variants provide 80mA output current versus 50mA for EL357NF-VG, feature 400mV Vce Saturation versus 200mV, and operate from -40°C to 110°C versus -55°C to 110°C. Current Transfer Ratio specifications differ across FODM121 variants. Package format differs (4-SMD versus 4-SOP). These differences require application-level evaluation.

Q: What is the difference between FODM121 and FODM124R2?

A: Both maintain 3750Vrms isolation and single-channel transistor output. FODM124R2 specifies Current Transfer Ratio at 1mA input current (100% to 1200%) versus FODM121 variants specified at 5mA input current (50% to 600%). FODM124R2 is available in Cut Tape & Digi-Reel packaging. Both feature 80mA output current and 400mV Vce Saturation. Operating temperature range is -40°C to 110°C for both.

Q: How do Broadcom HCPL-181 series components compare to onsemi FODM series?

A: Broadcom HCPL-181-000E matches EL357NF-VG output current (50mA) and Vce Saturation (200mV) but operates from -55°C to 100°C and uses 4-SOIC packaging. HCPL-181-00AE and HCPL-181-00BE also match 50mA output current and 200mV Vce Saturation, operate from -55°C to 100°C, and use 4-Mini-Flat packaging with different Current Transfer Ratio specifications. onsemi FODM series provide higher output current (80mA), higher Vce Saturation (400mV), and operate from -40°C to 110°C with 4-SMD packaging.

Q: What packaging formats are available for substitutes?

A: onsemi FODM121 is available in Tube packaging. FODM121AR2 and FODM121CR2 are available in Tape & Reel (TR) format. FODM121R2 is available in Tape & Reel (TR) format. FODM124R2 is available in Cut Tape (CT) & Digi-Reel® format. Broadcom HCPL-181-000E is available in Cut Tape (CT) & Digi-Reel® format. Broadcom HCPL-181-00AE and HCPL-181-00BE are available in Cut Tape (CT) & Digi-Reel® format. Packaging selection depends on procurement and assembly requirements.

Q: Are all substitutes RoHS3 compliant?

A: All listed substitute parts are RoHS3 compliant, matching the EL357NF-VG compliance status. All components have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life under controlled conditions.

Q: What is the significance of Current Transfer Ratio differences across substitutes?

A: Current Transfer Ratio defines the ratio of output current to input current. EL357NF-VG specifies 150% to 300% @ 5mA. FODM121 variants range from 50% to 600% depending on the specific part number. FODM124R2 specifies 100% to 1200% @ 1mA. Broadcom HCPL-181 variants range from 50% to 600%. Higher Current Transfer Ratio enables operation with lower input currents. Application circuit design determines the required Current Transfer Ratio specification.

Q: Can I interchange parts with different operating temperature ranges?

A: Operating temperature range differences require application-level evaluation. EL357NF-VG operates from -55°C to 110°C. onsemi FODM series operate from -40°C to 110°C, limiting low-temperature performance. Broadcom HCPL-181 series operate from -55°C to 100°C, limiting high-temperature performance. Applications requiring full -55°C to 110°C operation must use EL357NF-VG or equivalent parts with matching temperature specifications.

Q: What is the impact of Vce Saturation differences?

A: Vce Saturation is the collector-emitter voltage in saturation state. EL357NF-VG and Broadcom HCPL-181 series specify 200mV maximum. onsemi FODM series specify 400mV maximum. Higher Vce Saturation increases power dissipation in the output transistor. Applications with tight output voltage specifications or high output current requirements must account for this difference.

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