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EL357NB-VG Equivalent & Substitute Parts
Part Overview
The EL357NB-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 electrical isolation specifications, output type, channel configuration, and mechanical compatibility. Alternative models may be required due to inventory availability, packaging format preferences, or specific current transfer ratio requirements for application optimization.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Isolation | 3750 | Vrms |
| Number of Channels | 1 | — |
| Output Type | Transistor | — |
| Input Type | DC | — |
| Voltage - Output (Max) | 80 | V |
| Current - Output / Channel | 50 | mA |
| Mounting Type | Surface Mount | — |
| Package / Case | 4-SMD, Gull Wing | — |
| Operating Temperature Range | -55 to 110 | °C |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the EL357NB-VG are qualified based on the following critical parameters:
Primary Matching Criteria:
- Voltage - Isolation: 3750Vrms (exact match required)
- Number of Channels: 1 (single channel configuration)
- Output Type: Transistor (photodarlington or phototransistor output)
- Input Type: DC
- Mounting Type: Surface Mount
- Package Category: 4-pin SMD configuration
Secondary Compatibility Parameters:
- Voltage - Output (Max): 80V or greater
- Current - Output / Channel: 50mA or greater
- Operating Temperature Range: Must encompass or overlap with -55°C to 110°C
- RoHS Compliance: ROHS3 Compliant
Variable Parameters (Application-Dependent):
- Current Transfer Ratio (CTR): Ranges from 50% to 1200% depending on variant
- Vce Saturation: 200mV to 400mV
- Rise / Fall Time: 3µs to 4µs
- Voltage - Forward (Vf): 1.2V to 1.3V
Substitute parts are grouped by manufacturer and base product family. onsemi FODM series variants and Broadcom HCPL-181 series provide functional equivalence with variations in current transfer ratio specifications and packaging formats (Tube, Tape & Reel, Cut Tape).
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage (Vrms) | Channels | Output Type | Max Output Current (mA) | Max Output Voltage (V) | Vce Sat (Max, mV) | Operating Temp (°C) | Package | Packaging Format |
|---|---|---|---|---|---|---|---|---|---|---|
| EL357NB-VG | Everlight Electronics | 3750 | 1 | Transistor | 50 | 80 | 200 | -55 to 110 | 4-SOP (2.54mm) | — |
| FODM121 | onsemi | 3750 | 1 | Transistor | 80 | 80 | 400 | -40 to 110 | 4-SMD | Tube |
| FODM121AR2 | onsemi | 3750 | 1 | Transistor | 80 | 80 | 400 | -40 to 110 | 4-SMD | Tape & Reel |
| FODM121B | onsemi | 3750 | 1 | Transistor | 80 | 80 | 400 | -40 to 110 | 4-SMD | Tube |
| FODM121C | onsemi | 3750 | 1 | Transistor | 80 | 80 | 400 | -40 to 110 | 4-SMD | Tube |
| FODM121CR2 | onsemi | 3750 | 1 | Transistor | 80 | 80 | 400 | -40 to 110 | 4-SMD | Tape & Reel |
| FODM121R2 | onsemi | 3750 | 1 | Transistor | 80 | 80 | 400 | -40 to 110 | 4-SMD | Tape & Reel |
| FODM124 | onsemi | 3750 | 1 | Transistor | 80 | 80 | 400 | -40 to 110 | 4-SMD | Tube |
| FODM124R2 | onsemi | 3750 | 1 | Transistor | 80 | 80 | 400 | -40 to 110 | 4-SMD | Cut Tape & Digi-Reel |
| HCPL-181-000E | Broadcom Limited | 3750 | 1 | Transistor | 50 | 80 | 200 | -55 to 100 | 4-SOIC (5.30mm) | Cut Tape & Digi-Reel |
| HCPL-181-00AE | Broadcom Limited | 3750 | 1 | Transistor | 50 | 80 | 200 | -55 to 100 | 4-Mini-Flat | Cut Tape & Digi-Reel |
Engineering Selection Recommendations
Broadcom HCPL-181 Series (HCPL-181-000E, HCPL-181-00AE):
These parts provide electrical parameter equivalence to the EL357NB-VG with matching Vce saturation (200mV), output current (50mA), and isolation voltage (3750Vrms). Both variants are ROHS3 compliant and REACH unaffected. Operating temperature range extends to -55°C minimum, matching the EL357NB-VG specification. The HCPL-181-000E uses 4-SOIC packaging while HCPL-181-00AE uses 4-Mini-Flat packaging. Selection between these depends on PCB layout requirements and available footprint space.
onsemi FODM121 Series (FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, FODM121R2):
These parts meet the 3750Vrms isolation requirement and single-channel transistor output specification. All variants are ROHS3 compliant and REACH unaffected. Output current capability is increased to 80mA, exceeding the EL357NB-VG specification of 50mA. Vce saturation is 400mV, higher than the EL357NB-VG (200mV). Operating temperature minimum is -40°C, which does not extend to the -55°C specification of the EL357NB-VG. Variants differ in current transfer ratio ranges and packaging formats (Tube, Tape & Reel). Selection depends on CTR requirements and packaging format availability.
onsemi FODM124 Series (FODM124, FODM124R2):
These parts provide 3750Vrms isolation with single-channel transistor output and 80mA output current capability. Current transfer ratio is specified at 100% to 1200% at 1mA input, differing from the EL357NB-VG specification at 5mA input. Operating temperature range is -40°C to 110°C. Both ROHS3 compliant and REACH unaffected. FODM124 is supplied in Tube format; FODM124R2 is supplied in Cut Tape & Digi-Reel format.
Temperature Range Consideration:
Applications requiring operation at -55°C must use HCPL-181-000E or HCPL-181-00AE. onsemi FODM series variants are limited to -40°C minimum operating temperature.
Frequently Asked Questions (FAQ)
Q: Can FODM121 variants directly replace EL357NB-VG in all applications?
A: FODM121 variants meet the core isolation voltage (3750Vrms), channel count (1), output type (transistor), and maximum output voltage (80V) specifications. However, three differences exist: (1) Operating temperature minimum is -40°C versus -55°C for EL357NB-VG, limiting use in extreme cold environments; (2) Vce saturation is 400mV versus 200mV, affecting switching characteristics; (3) Output current is 80mA versus 50mA, providing additional margin. Substitution is valid for applications within -40°C to 110°C temperature range where higher saturation voltage is acceptable.
Q: What is the difference between FODM121 and FODM124?
A: Both provide 3750Vrms isolation and single-channel transistor output. The primary difference is current transfer ratio specification: FODM121 variants specify CTR at 5mA input current (ranges from 50% to 600% depending on variant), while FODM124 specifies CTR at 1mA input current (100% to 1200%). This reflects different input sensitivity characteristics. FODM124 is more sensitive to input current changes. Selection depends on circuit input current levels and required gain characteristics.
Q: Are packaging format differences between Tube, Tape & Reel, and Cut Tape significant for substitution?
A: Packaging format affects supply and handling but not electrical performance. Tube packaging is suitable for manual assembly or small-volume production. Tape & Reel (TR) and Cut Tape (CT) formats are optimized for automated pick-and-place assembly. All formats contain identical components; selection depends on manufacturing process requirements and inventory management practices.
Q: Why does HCPL-181-00AE use 4-Mini-Flat packaging instead of 4-SOP?
A: HCPL-181-00AE uses 4-Mini-Flat package geometry, which differs from the 4-SOP (2.54mm) of EL357NB-VG. While both are surface mount 4-pin configurations, the physical dimensions and lead spacing differ. PCB footprint compatibility must be verified before substitution. HCPL-181-000E uses 4-SOIC packaging, also differing from 4-SOP. Mechanical compatibility requires footprint redesign or adapter consideration.
Q: Can I substitute EL357NB-VG with HCPL-181-000E without circuit modification?
A: Electrical parameters are equivalent: 3750Vrms isolation, 50mA output current, 200mV Vce saturation, and -55°C minimum operating temperature. However, package geometry differs (4-SOIC versus 4-SOP). PCB footprint is incompatible without layout modification. If PCB redesign is feasible, HCPL-181-000E provides direct electrical substitution with extended availability.
Q: What is the significance of Current Transfer Ratio (CTR) ranges in substitute selection?
A: CTR determines the output current relative to input current. EL357NB-VG specifies 130% to 260% CTR at 5mA input. FODM121 variants range from 50% to 600% depending on grade (B, C, AR2, CR2, R2). Higher CTR provides greater output current for given input current, affecting circuit gain and switching speed. Application circuits must accommodate the CTR range of the selected substitute to ensure proper operation across input current variations and temperature extremes.
Q: Is RoHS3 compliance maintained across all substitute parts?
A: Yes. EL357NB-VG, all onsemi FODM variants, and all Broadcom HCPL-181 variants listed are ROHS3 compliant. This compliance is maintained across all packaging formats and variants. REACH status for onsemi parts is listed as REACH Unaffected, indicating no restricted substances of concern.
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