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EL357NE(TA)-VG Optoisolator Equivalent & Substitute Parts
Part Overview
The EL357NE(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. The device is classified as Active product status and is RoHS3 compliant with MSL Level 1 (Unlimited moisture sensitivity).
Substitute parts are identified when equivalent electrical and mechanical parameters are available from alternative manufacturers. Substitution becomes necessary due to inventory availability, lead time requirements, manufacturing discontinuation, or supply chain optimization while maintaining functional compatibility within specified parameter ranges.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Isolation Voltage | 3750 | Vrms |
| Number of Channels | 1 | — |
| Output Type | Transistor | — |
| Current Transfer Ratio (Min) | 100 | % @ 5mA |
| Current Transfer Ratio (Max) | 200 | % @ 5mA |
| Voltage - Output (Max) | 80 | V |
| Current - Output / Channel | 50 | mA |
| Vce Saturation (Max) | 200 | mV |
| Operating Temperature Range | -55 to 110 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | 4-SMD, Gull Wing | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the EL357NE(TA)-VG are grouped based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:
Critical Parameters (Must Match or Exceed):
- Isolation Voltage: 3750Vrms minimum
- Number of Channels: 1 channel
- Output Type: Transistor output
- Voltage - Output (Max): 80V minimum
- Input Type: DC
- RoHS Status: ROHS3 Compliant
- MSL Level: 1 (Unlimited)
Acceptable Parameter Ranges:
- Current Transfer Ratio (Min): 50% to 100% @ specified test current
- Current Transfer Ratio (Max): 150% to 600% @ specified test current
- Current - Output / Channel: 50mA to 80mA
- Vce Saturation (Max): 200mV to 400mV
- Operating Temperature Range: -40°C to -55°C minimum; 100°C to 110°C maximum
- Rise / Fall Time: 3µs to 4µs range
Package Compatibility:
- Surface Mount technology required
- 4-pin configuration (4-SMD, 4-SOP, 4-SOIC, 4-Mini-Flat acceptable)
Substitute parts are organized by manufacturer and packaging type. Parts meeting all critical parameters and operating within acceptable ranges are listed as direct substitutes.
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage (Vrms) | CTR Min (% @ mA) | CTR Max (% @ mA) | Output Current (mA) | Vce Sat Max (mV) | Temp Range (°C) | Package | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|
| EL357NE(TA)-VG | Everlight Electronics | 3750 | 100 @ 5 | 200 @ 5 | 50 | 200 | -55 to 110 | 4-SOP (2.54mm) | — |
| FODM121 | onsemi | 3750 | 50 @ 5 | 600 @ 5 | 80 | 400 | -40 to 110 | 4-SMD | Tube |
| FODM121AR2 | onsemi | 3750 | 100 @ 5 | 300 @ 5 | 80 | 400 | -40 to 110 | 4-SMD | Tape & Reel (TR) |
| FODM121B | onsemi | 3750 | 50 @ 5 | 150 @ 5 | 80 | 400 | -40 to 110 | 4-SMD | Tube |
| FODM121C | onsemi | 3750 | 100 @ 5 | 200 @ 5 | 80 | 400 | -40 to 110 | 4-SMD | Tube |
| FODM121CR2 | onsemi | 3750 | 100 @ 5 | 200 @ 5 | 80 | 400 | -40 to 110 | 4-SMD | Tape & Reel (TR) |
| FODM121R2 | onsemi | 3750 | 50 @ 5 | 600 @ 5 | 80 | 400 | -40 to 110 | 4-SMD | Tape & Reel (TR) |
| FODM124R2 | onsemi | 3750 | 100 @ 1 | 1200 @ 1 | 80 | 400 | -40 to 110 | 4-SMD | Cut Tape (CT) & Digi-Reel® |
| HCPL-181-000E | Broadcom Limited | 3750 | 50 @ 5 | 600 @ 5 | 50 | 200 | -55 to 100 | 4-SOIC (0.209", 5.30mm) | Cut Tape (CT) & Digi-Reel® |
| HCPL-181-00AE | Broadcom Limited | 3750 | 80 @ 5 | 160 @ 5 | 50 | 200 | -55 to 100 | 4-Mini-Flat | Cut Tape (CT) & Digi-Reel® |
| HCPL-181-00BE | Broadcom Limited | 3750 | 130 @ 5 | 260 @ 5 | 50 | 200 | -55 to 100 | 4-Mini-Flat | Cut Tape (CT) & Digi-Reel® |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
FODM121C and FODM121CR2 (onsemi) provide the closest electrical match to EL357NE(TA)-VG with identical Current Transfer Ratio specifications (100% to 200% @ 5mA). Both maintain 3750Vrms isolation, transistor output configuration, and RoHS3 compliance. FODM121CR2 is supplied in Tape & Reel packaging for automated assembly environments. Operating temperature range is -40°C to 110°C, which covers the primary operating window of the original part.
HCPL-181-00BE (Broadcom Limited) offers equivalent isolation voltage and output current specifications with Current Transfer Ratio of 130% to 260% @ 5mA. This part maintains identical Vce Saturation (200mV) and forward voltage characteristics. Operating temperature range extends to -55°C minimum, matching the original part's lower temperature limit. Package format is 4-Mini-Flat with Cut Tape & Digi-Reel® packaging.
Secondary Substitutes (Extended Parameter Range):
FODM121AR2 (onsemi) provides Current Transfer Ratio of 100% to 300% @ 5mA with higher output current capability (80mA). This part is suitable for applications requiring increased output drive capability while maintaining isolation voltage and RoHS3 compliance.
HCPL-181-000E (Broadcom Limited) offers Current Transfer Ratio of 50% to 600% @ 5mA with identical output current (50mA) and Vce Saturation (200mV) to the original part. Operating temperature minimum is -55°C. This part is available in 4-SOIC package format.
Packaging Considerations:
The original EL357NE(TA)-VG uses 4-SOP (2.54mm) package. Substitute parts employ 4-SMD, 4-SOIC, or 4-Mini-Flat packages. PCB layout modifications may be required due to different pin pitch and footprint dimensions. All substitute parts maintain surface mount technology and 4-pin configuration.
Compliance Status:
All listed substitute parts are RoHS3 compliant with MSL Level 1 (Unlimited). All parts carry ECCN EAR99 and HTSUS 8541.49.8000 classifications matching the original part.
Frequently Asked Questions (FAQ)
Q: Can FODM121 series parts directly replace EL357NE(TA)-VG without circuit modifications?
A: FODM121 series parts maintain identical isolation voltage (3750Vrms), transistor output configuration, and single-channel design. However, output current capability is higher (80mA vs. 50mA) and Vce Saturation is higher (400mV vs. 200mV). Circuit design must accommodate these parameter differences. PCB footprint changes are required due to different package geometry.
Q: What is the difference between FODM121C and FODM121CR2?
A: Both parts have identical electrical specifications (100% to 200% CTR @ 5mA, 3750Vrms isolation, 80mA output current). The difference is packaging: FODM121C is supplied in Tube packaging, while FODM121CR2 is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated pick-and-place assembly.
Q: Why does FODM124R2 have different Current Transfer Ratio specifications?
A: FODM124R2 specifies Current Transfer Ratio at 1mA test current (100% to 1200% @ 1mA) rather than 5mA. This represents a different device grade within the FODM family with higher current transfer efficiency at lower input currents. Direct comparison requires normalizing to the same test current conditions.
Q: Are Broadcom HCPL-181 series parts compatible with onsemi FODM121 series?
A: Both series maintain 3750Vrms isolation voltage, transistor output, and RoHS3 compliance. However, they differ in package format (4-SOIC or 4-Mini-Flat vs. 4-SMD), output current (50mA vs. 80mA), and Vce Saturation (200mV vs. 400mV). Electrical compatibility exists, but PCB redesign is required for package conversion.
Q: What is the operating temperature difference between EL357NE(TA)-VG and substitute parts?
A: EL357NE(TA)-VG operates from -55°C to 110°C. onsemi FODM121 series operates from -40°C to 110°C (10°C higher minimum). Broadcom HCPL-181 series operates from -55°C to 100°C (10°C lower maximum). Application temperature requirements must be verified against substitute part specifications.
Q: Can I use HCPL-181-000E as a direct substitute for high Current Transfer Ratio applications?
A: HCPL-181-000E provides Current Transfer Ratio of 50% to 600% @ 5mA, which exceeds the original part's 100% to 200% range. This part is suitable for applications requiring wide CTR tolerance or higher current transfer efficiency. Output current remains 50mA, matching the original specification.
Q: What packaging considerations apply when switching from EL357NE(TA)-VG to FODM121 series?
A: EL357NE(TA)-VG uses 4-SOP (2.54mm) package with specific pin pitch. FODM121 series uses 4-SMD package with different footprint dimensions. PCB layout must be redesigned to accommodate the new package geometry. Automated assembly equipment settings require adjustment for the different package type.
Q: Are all substitute parts available in the same packaging formats?
A: No. onsemi FODM121 series is available in Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel® formats depending on specific part number suffix. Broadcom HCPL-181 series is available in Cut Tape (CT) & Digi-Reel® format. Packaging availability must be confirmed with supplier inventory.
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