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EL357NC-VG Equivalent & Substitute Parts
Part Overview
The EL357NC-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 based on matching isolation voltage, output type, channel configuration, and mechanical compatibility to ensure functional equivalence in circuit applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Isolation | 3750Vrms |
| Number of Channels | 1 |
| 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 |
Substitute Part Grouping Explanation
Substitute parts for the EL357NC-VG are selected 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)
- Mounting Type: Surface Mount (mandatory match)
Secondary Compatibility Criteria:
- Voltage - Output (Max): 80V or greater
- Current - Output / Channel: 50mA or greater
- Package / Case: 4-SMD, Gull Wing or equivalent surface mount configuration
- Operating Temperature Range: Must encompass or overlap with -55°C ~ 110°C
- RoHS Status: ROHS3 Compliant
Substitute parts are grouped by manufacturer and packaging variant. The onsemi FODM121 series and Broadcom HCPL-181 series meet all primary matching criteria. Variations within each series differ in Current Transfer Ratio specifications and packaging format (Tube, Tape & Reel, or Cut Tape), which do not affect functional substitution capability.
Parameter Comparison
| Parameter | EL357NC-VG | FODM121 | FODM121AR2 | FODM121B | FODM121C | FODM121CR2 | FODM121R2 | FODM124 | FODM124R2 | HCPL-181-000E | HCPL-181-00AE |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Everlight Electronics Co Ltd | onsemi | onsemi | onsemi | onsemi | onsemi | onsemi | onsemi | onsemi | Broadcom Limited | Broadcom Limited |
| 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 |
| 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 |
| Vce Saturation (Max) | 200mV | 400mV | 400mV | 400mV | 400mV | 400mV | 400mV | 400mV | 400mV | 200mV | 200mV |
| 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) |
| ECCN | EAR99 | EAR99 | EAR99 | EAR99 | EAR99 | EAR99 | EAR99 | EAR99 | EAR99 | EAR99 | EAR99 |
Engineering Selection Recommendations
onsemi FODM121 Series (FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, FODM121R2)
The FODM121 series provides direct functional substitution for the EL357NC-VG. All variants maintain 3750Vrms isolation voltage, single-channel transistor output, and 4-SMD gull wing package configuration. The series offers higher output current capability (80mA versus 50mA) and is available in multiple packaging formats: Tube, Tape & Reel (TR), and Cut Tape (CT). All variants are ROHS3 compliant with MSL 1 rating. Operating temperature range is -40°C ~ 110°C, which covers the upper portion of the EL357NC-VG range. Current Transfer Ratio specifications vary across variants (50% to 600% @ 5mA for FODM121, 100% to 1200% @ 1mA for FODM124), allowing selection based on specific circuit requirements.
onsemi FODM124 Series (FODM124, FODM124R2)
The FODM124 series provides substitution with enhanced current transfer ratio performance (100% to 1200% @ 1mA). These variants maintain all primary matching criteria and are available in Tube and Cut Tape & Digi-Reel packaging. ROHS3 compliance and MSL 1 rating are maintained. Operating temperature range is -40°C ~ 110°C.
Broadcom HCPL-181 Series (HCPL-181-000E, HCPL-181-00AE)
The HCPL-181 series provides substitution with package variations. HCPL-181-000E uses 4-SOIC (0.209", 5.30mm Width) packaging, while HCPL-181-00AE uses 4-SMD gull wing packaging. Both maintain 3750Vrms isolation, single-channel transistor output, and 50mA output current matching the EL357NC-VG. Vce saturation is 200mV, matching the main part specification. ROHS3 compliance and MSL 1 rating are maintained. Operating temperature range is -55°C ~ 100°C, providing full coverage of the lower temperature range but limited to 100°C maximum.
Selection Criteria by Application:
- For applications requiring -55°C minimum operating temperature: Select HCPL-181-000E or HCPL-181-00AE
- For applications requiring 110°C maximum operating temperature: Select FODM121 or FODM124 series
- For applications requiring both -55°C and 110°C range: EL357NC-VG is the only option among provided substitutes
- For applications requiring higher output current: Select FODM121 or FODM124 series (80mA capability)
- For packaging format flexibility: FODM121 series offers Tube, Tape & Reel, and Cut Tape options
Frequently Asked Questions (FAQ)
Q: Can FODM121 series parts directly replace EL357NC-VG in existing circuit boards?
A: Yes, FODM121 series parts with 4-SMD gull wing packaging are pin-compatible and functionally equivalent. The higher output current capability (80mA versus 50mA) and different Vce saturation specification (400mV versus 200mV) must be evaluated for specific circuit requirements, but these represent improved or equivalent performance in most applications.
Q: What is the difference between FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, and FODM121R2?
A: These variants differ in packaging format and Current Transfer Ratio specifications. FODM121 and FODM121B are supplied in Tube packaging. FODM121AR2, FODM121CR2, and FODM121R2 are supplied in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel packaging. Current Transfer Ratio ranges vary: FODM121 and FODM121R2 specify 50% to 600% @ 5mA; FODM121AR2 and FODM121CR2 specify 100% to 200% @ 5mA; FODM121B specifies 50% to 150% @ 5mA. All maintain identical electrical isolation, output voltage, and package configuration.
Q: Why does HCPL-181-000E use 4-SOIC packaging instead of 4-SMD?
A: HCPL-181-000E is packaged in 4-SOIC (0.209", 5.30mm Width) format, which is a different surface mount package type. While functionally equivalent to EL357NC-VG, this variant requires different PCB footprint and reflow profile considerations. HCPL-181-00AE provides the same electrical specifications in 4-SMD gull wing packaging for direct board-level compatibility.
Q: Are all substitute parts RoHS3 compliant?
A: Yes, all substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the EL357NC-VG specification.
Q: What is the impact of different operating temperature ranges?
A: EL357NC-VG operates from -55°C to 110°C. FODM121 and FODM124 series operate from -40°C to 110°C, limiting low-temperature performance by 15°C. HCPL-181 series operates from -55°C to 100°C, limiting high-temperature performance by 10°C. Application requirements must determine acceptable temperature range limitations.
Q: Can FODM124 replace FODM121 in the same application?
A: FODM124 provides higher current transfer ratio (100% to 1200% @ 1mA versus 50% to 600% @ 5mA for FODM121). Both maintain identical isolation voltage, output voltage, and package configuration. FODM124 is suitable where higher current transfer ratio is beneficial or required by circuit design.
Q: What does Current Transfer Ratio (CTR) specification mean for substitution?
A: Current Transfer Ratio defines the ratio of output current to input current. Different CTR ranges indicate different LED-to-transistor coupling efficiency. Substitute parts with different CTR specifications may require circuit design adjustments to input drive current or output load impedance to achieve equivalent performance.
Q: Are there inventory considerations for substitute part selection?
A: Inventory levels vary significantly across substitute parts. FODM121CR2 has 66,880 units in stock, while FODM121B has 2,600 units. HCPL-181-000E has 47,300 units available. Inventory availability may influence procurement decisions for high-volume applications.
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