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EL357ND-VG Equivalent & Substitute Parts
Part Overview
The EL357ND-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. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across isolation voltage, output current capacity, current transfer ratio specifications, and surface mount package types.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | EL357ND-VG |
| Manufacturer | Everlight Electronics Co Ltd |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 3750Vrms |
| Current Transfer Ratio (Min) | 300% @ 5mA |
| Current Transfer Ratio (Max) | 600% @ 5mA |
| Output Type | Transistor |
| Voltage - Output (Max) | 80V |
| Current - Output / Channel | 50mA |
| Vce Saturation (Max) | 200mV |
| Operating Temperature | -55°C ~ 110°C |
| Mounting Type | Surface Mount |
| Package / Case | 4-SMD, Gull Wing |
| RoHS Status | ROHS3 Compliant |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the EL357ND-VG are qualified based on the following criteria:
Primary Matching Parameters:
- Voltage - Isolation: 3750Vrms (exact match required)
- Number of Channels: 1 (exact match required)
- Output Type: Transistor (exact match required)
- Mounting Type: Surface Mount (exact match required)
- Input Type: DC (exact match required)
Compatible Parameter Ranges:
- Current Transfer Ratio: Substitute must fall within or overlap the range 300%-600% @ 5mA, or demonstrate equivalent performance at specified test current
- Voltage - Output (Max): Substitute must be ≥80V
- Current - Output / Channel: Substitute must be ≥50mA
- Vce Saturation (Max): Substitute must be ≤200mV or within acceptable saturation performance
- Operating Temperature: Substitute must cover or exceed -55°C ~ 110°C range
- Package / Case: 4-SMD Gull Wing or equivalent surface mount 4-pin configuration
Compliance Requirements:
- RoHS3 Compliant (mandatory)
- Product Status: Active (mandatory)
Substitute parts are grouped by manufacturer and packaging configuration. onsemi FODM series parts meet isolation voltage, channel count, output type, and mounting requirements. Broadcom HCPL-181 series parts meet the same core electrical and mechanical criteria with alternative package geometries (4-SOIC, 4-Mini-Flat).
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage | Channels | CTR Min @ 5mA | CTR Max @ 5mA | Output Current | Vce Sat (Max) | Temp Range | Package | RoHS3 |
|---|---|---|---|---|---|---|---|---|---|---|
| EL357ND-VG | Everlight | 3750Vrms | 1 | 300% | 600% | 50mA | 200mV | -55 to 110°C | 4-SOP | Yes |
| FODM121 | onsemi | 3750Vrms | 1 | 50% | 600% | 80mA | 400mV | -40 to 110°C | 4-SMD | Yes |
| FODM121AR2 | onsemi | 3750Vrms | 1 | 100% | 300% | 80mA | 400mV | -40 to 110°C | 4-SMD | Yes |
| FODM121B | onsemi | 3750Vrms | 1 | 50% | 150% | 80mA | 400mV | -40 to 110°C | 4-SMD | Yes |
| FODM121C | onsemi | 3750Vrms | 1 | 100% | 200% | 80mA | 400mV | -40 to 110°C | 4-SMD | Yes |
| FODM121CR2 | onsemi | 3750Vrms | 1 | 100% | 200% | 80mA | 400mV | -40 to 110°C | 4-SMD | Yes |
| FODM121R2 | onsemi | 3750Vrms | 1 | 50% | 600% | 80mA | 400mV | -40 to 110°C | 4-SMD | Yes |
| FODM124R2 | onsemi | 3750Vrms | 1 | 100% @ 1mA | 1200% @ 1mA | 80mA | 400mV | -40 to 110°C | 4-SMD | Yes |
| HCPL-181-000E | Broadcom | 3750Vrms | 1 | 50% | 600% | 50mA | 200mV | -55 to 100°C | 4-SOIC | Yes |
| HCPL-181-00AE | Broadcom | 3750Vrms | 1 | 80% | 160% | 50mA | 200mV | -55 to 100°C | 4-Mini-Flat | Yes |
| HCPL-181-00BE | Broadcom | 3750Vrms | 1 | 130% | 260% | 50mA | 200mV | -55 to 100°C | 4-Mini-Flat | Yes |
Engineering Selection Recommendations
onsemi FODM121 Series (Tube Packaging)
FODM121, FODM121B, and FODM121C are available in tube packaging. These parts maintain 3750Vrms isolation voltage and single-channel transistor output configuration. FODM121 and FODM121R2 provide current transfer ratio range of 50%-600%, matching the upper performance envelope of the EL357ND-VG. FODM121B offers reduced CTR range (50%-150%), suitable for applications requiring lower gain. FODM121C provides intermediate CTR range (100%-200%). All onsemi FODM121 variants support 80mA output current, exceeding the 50mA specification of the EL357ND-VG. Operating temperature range is -40°C to 110°C, covering the upper operating limit of the main part but with reduced low-temperature performance.
onsemi FODM121 Series (Tape & Reel Packaging)
FODM121AR2 and FODM121CR2 are supplied in Tape & Reel format. FODM121AR2 provides CTR range of 100%-300%, overlapping the main part specification. FODM121CR2 provides CTR range of 100%-200%. Both support 80mA output current and maintain -40°C to 110°C operating range.
onsemi FODM121R2 (Tape & Reel)
FODM121R2 provides 50%-600% CTR range in Tape & Reel packaging, matching the full performance envelope of the EL357ND-VG with 80mA output current capability.
onsemi FODM124R2 (Cut Tape & Digi-Reel)
FODM124R2 is specified with current transfer ratio measured at 1mA input current (100%-1200% @ 1mA), differing from the standard 5mA test condition. This part supports 80mA output current and maintains 3750Vrms isolation.
Broadcom HCPL-181-000E (4-SOIC Package)
HCPL-181-000E provides 50%-600% CTR @ 5mA, matching the EL357ND-VG performance envelope. Output current is 50mA, matching the main part specification. Vce saturation is 200mV, identical to the main part. Operating temperature range is -55°C to 100°C. Package is 4-SOIC (0.209", 5.30mm Width), requiring PCB layout modification from the 4-SOP configuration.
Broadcom HCPL-181-00AE (4-Mini-Flat Package)
HCPL-181-00AE provides 80%-160% CTR @ 5mA with 50mA output current and 200mV Vce saturation. Operating temperature is -55°C to 100°C. Package is 4-Mini-Flat, requiring PCB layout modification.
Broadcom HCPL-181-00BE (4-Mini-Flat Package)
HCPL-181-00BE provides 130%-260% CTR @ 5mA with 50mA output current and 200mV Vce saturation. Operating temperature is -55°C to 100°C. Package is 4-Mini-Flat.
All substitute parts are Active product status and RoHS3 compliant. Selection should account for packaging compatibility with existing PCB designs and operating temperature requirements below -40°C.
Frequently Asked Questions (FAQ)
Q: Can FODM121 series parts directly replace EL357ND-VG in existing PCB designs?
A: FODM121 series parts maintain identical 3750Vrms isolation voltage, single-channel transistor output, and surface mount configuration. Package geometry is 4-SMD Gull Wing, compatible with 4-SOP footprints in most PCB designs. However, physical dimensions should be verified against the specific PCB layout. FODM121 series supports higher output current (80mA vs. 50mA), which is compatible with the main part application.
Q: What is the difference between FODM121, FODM121B, and FODM121C?
A: These parts differ in current transfer ratio specification. FODM121 provides 50%-600% CTR @ 5mA. FODM121B provides 50%-150% CTR @ 5mA. FODM121C provides 100%-200% CTR @ 5mA. All maintain identical isolation voltage, output current, and operating temperature range. Selection depends on the required gain characteristics for the specific application circuit.
Q: Why do HCPL-181 series parts have different package types than the main part?
A: HCPL-181-000E uses 4-SOIC package (0.209", 5.30mm Width). HCPL-181-00AE and HCPL-181-00BE use 4-Mini-Flat package. These package types are not pin-compatible with the 4-SOP configuration of EL357ND-VG. PCB redesign is required for these substitutes. Package selection should be based on available PCB real estate and manufacturing capabilities.
Q: What is the significance of the CTR test current specification?
A: Current transfer ratio is measured at a specified input current. EL357ND-VG and most substitute parts specify CTR @ 5mA input current. FODM124R2 specifies CTR @ 1mA input current (100%-1200% @ 1mA), which is not directly comparable to the 5mA specification. Application circuits must account for the actual input current to determine effective gain.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts are RoHS3 compliant and Active product status, matching the compliance profile of EL357ND-VG.
Q: What is the impact of operating temperature range differences?
A: EL357ND-VG operates from -55°C to 110°C. onsemi FODM121 series operates from -40°C to 110°C. Broadcom HCPL-181 series operates from -55°C to 100°C. Applications requiring operation below -40°C must use EL357ND-VG or HCPL-181 series. Applications requiring operation above 100°C must use EL357ND-VG or onsemi FODM121 series.
Q: What is the difference between tube and tape & reel packaging?
A: Tube packaging (FODM121, FODM121B, FODM121C) is used for lower-volume orders and manual assembly. Tape & Reel packaging (FODM121AR2, FODM121CR2, FODM121R2) is used for automated pick-and-place assembly. Electrical specifications are identical; packaging selection depends on manufacturing process requirements.
Q: Can FODM124R2 be used as a direct substitute?
A: FODM124R2 maintains 3750Vrms isolation voltage, single-channel transistor output, and surface mount configuration. However, CTR is specified at 1mA input current (100%-1200% @ 1mA) rather than 5mA. Direct substitution requires circuit analysis to confirm that the different test condition does not affect application performance.
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