EL357NB(TB)-VG Equivalent & Substitute Parts

Part Overview

The EL357NB(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 810 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
Manufacturer Part Number	EL357NB(TB)-VG
Manufacturer	Everlight Electronics Co Ltd
Category	Optoisolators
Voltage - Isolation	3750Vrms
Number of Channels	1
Output Type	Transistor
Input Type	DC
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Current Transfer Ratio (Min)	130% @ 5mA
Current Transfer Ratio (Max)	260% @ 5mA
Vce Saturation (Max)	200mV
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	50mA
Rise / Fall Time (Typ)	3µs, 4µs
Operating Temperature	-55°C ~ 110°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Supplier Device Package	4-SOP (2.54mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the EL357NB(TB)-VG are qualified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

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

Secondary Compatibility Parameters:

Current - Output / Channel: 50mA or higher
Vce Saturation (Max): 200mV or lower
Voltage - Forward (Vf) (Typ): 1.2V or lower
Operating Temperature Range: Must encompass or exceed -55°C ~ 110°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are grouped into two categories based on Current Transfer Ratio specifications at 5mA input current, which affects circuit design requirements but does not prevent functional substitution when output current and isolation voltage requirements are met.

Parameter Comparison

Parameter	EL357NB(TB)-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
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	80mA	50mA	50mA
Current Transfer Ratio (Min) @ 5mA	130%	50%	100%	50%	100%	100%	50%	100% @ 1mA	100% @ 1mA	50%	80%
Current Transfer Ratio (Max) @ 5mA	260%	600%	300%	150%	200%	200%	600%	1200% @ 1mA	1200% @ 1mA	600%	160%
Vce Saturation (Max)	200mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	400mV	200mV	200mV
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
Current - DC Forward (If) (Max)	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA	50mA
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 (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
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 EL357NB(TB)-VG. Selection among substitutes depends on specific circuit requirements:

onsemi FODM121 Series (FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, FODM121R2): These parts provide 3750Vrms isolation with 80mA output current capability, exceeding the EL357NB(TB)-VG specification of 50mA. The FODM121 variants differ in Current Transfer Ratio ranges and packaging formats (Tube, Tape & Reel, Cut Tape). All operate across -40°C to 110°C temperature range. Vce Saturation is specified at 400mV maximum, compared to 200mV for the EL357NB(TB)-VG. Forward voltage is 1.3V maximum.

onsemi FODM124 Series (FODM124, FODM124R2): These parts feature higher Current Transfer Ratio specifications (100% to 1200% @ 1mA) and 80mA output current. Operating temperature range is -40°C to 110°C. Vce Saturation and forward voltage specifications match the FODM121 series.

Broadcom HCPL-181-000E: This part maintains 50mA output current matching the EL357NB(TB)-VG and 200mV Vce Saturation. Package is 4-SOIC (0.209", 5.30mm Width) rather than 4-SOP, requiring PCB layout modification. Operating temperature range is -55°C to 100°C, with upper limit 10°C lower than the main part.

Broadcom HCPL-181-00AE: This part provides 50mA output current and 200mV Vce Saturation in 4-SMD Gull Wing package matching the EL357NB(TB)-VG footprint. Current Transfer Ratio range is 80% to 160% @ 5mA. Operating temperature is -55°C to 100°C.

Frequently Asked Questions (FAQ)

Q: Can FODM121 series parts directly replace EL357NB(TB)-VG in existing designs?

A: FODM121 series parts are functionally equivalent for isolation voltage (3750Vrms), channel count (1), output type (transistor), and package footprint (4-SMD Gull Wing). However, circuit design must account for differences in Vce Saturation (400mV vs. 200mV) and forward voltage (1.3V vs. 1.2V). Output current capability is higher (80mA vs. 50mA), which does not prevent substitution. Operating temperature minimum is -40°C instead of -55°C; verify application requirements.

Q: What is the difference between FODM121 and FODM124?

A: Both series maintain identical isolation voltage, channel count, output type, and package specifications. FODM124 specifies Current Transfer Ratio at 1mA input (100% to 1200%) versus FODM121 at 5mA input (50% to 600%). This affects input circuit design but does not prevent functional substitution when isolation and output specifications are met.

Q: Why does HCPL-181-000E have a different package than other substitutes?

A: HCPL-181-000E is specified in 4-SOIC (0.209", 5.30mm Width) package, while EL357NB(TB)-VG and most other substitutes use 4-SMD Gull Wing. This requires PCB layout modification and cannot be used as a direct footprint replacement without redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the EL357NB(TB)-VG compliance status.

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

A: Current Transfer Ratio determines the relationship between input LED current and output transistor current. Higher ratios require lower input current for equivalent output performance. Differences in CTR specifications (e.g., 130-260% for EL357NB(TB)-VG vs. 50-600% for FODM121) affect input circuit design but do not prevent functional substitution when isolation voltage and output current requirements are met.

Q: Can HCPL-181-00AE replace EL357NB(TB)-VG without circuit modification?

A: HCPL-181-00AE maintains matching isolation voltage (3750Vrms), output current (50mA), Vce Saturation (200mV), forward voltage (1.2V), and 4-SMD Gull Wing package footprint. Operating temperature range is -55°C to 100°C versus -55°C to 110°C for the main part. Substitution is feasible if application maximum operating temperature does not exceed 100°C.

Q: What packaging options are available for FODM121?

A: FODM121 is available in Tube (FODM121, FODM121B, FODM121C), Tape & Reel (FODM121AR2, FODM121CR2, FODM121R2), and Cut Tape & Digi-Reel formats. Selection depends on procurement and assembly requirements. All variants maintain identical electrical specifications within their respective Current Transfer Ratio grades.

Q: Is operating temperature range a limiting factor for substitution?

A: Operating temperature range differences must be evaluated against application requirements. EL357NB(TB)-VG operates -55°C to 110°C. FODM121 series operates -40°C to 110°C (higher minimum). HCPL-181 series operates -55°C to 100°C (lower maximum). Substitution is valid only when application temperature requirements fall within the substitute part's specified range.

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