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EL357NF(TB)-VG Equivalent & Substitute Parts
Part Overview
The EL357NF(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 and is designed for DC input applications requiring galvanic isolation. The part is active and RoHS3 compliant with unlimited moisture sensitivity rating.
Substitute parts are identified based on matching critical electrical parameters: isolation voltage (3750Vrms), transistor output configuration, single-channel design, 4-SMD/4-SOP package compatibility, and surface mount technology. Alternative sources ensure design continuity when primary inventory is unavailable.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Isolation Voltage | 3750Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Input Type | DC |
| Maximum Output Voltage | 80V |
| Maximum Output Current | 50mA |
| Mounting Type | Surface Mount |
| Package Type | 4-SOP / 4-SMD Gull Wing |
| Operating Temperature Range | -55°C to 110°C |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following mandatory parameters:
Electrical Compatibility Requirements:
- Isolation voltage: 3750Vrms (exact match required)
- Output configuration: Transistor output (exact match required)
- Channel count: 1 channel (exact match required)
- Input type: DC (exact match required)
- Maximum output voltage: 80V minimum
- Maximum output current: 50mA minimum
Mechanical Compatibility Requirements:
- Mounting type: Surface mount (exact match required)
- Package family: 4-SMD or 4-SOP with gull wing leads (compatible footprints)
Compliance Requirements:
- RoHS3 compliance (all substitutes must meet this standard)
- Active product status
Substitute parts are grouped by manufacturer and packaging configuration. Current Transfer Ratio (CTR), forward voltage, and saturation voltage specifications may vary within acceptable ranges for the application category. Rise and fall time parameters are provided for reference but do not restrict substitution eligibility when other critical parameters align.
Parameter Comparison
| Parameter | EL357NF(TB)-VG | FODM121 | FODM121AR2 | FODM121B | FODM121C | FODM121CR2 | FODM121R2 | FODM124R2 | HCPL-181-000E | HCPL-181-00AE | HCPL-181-00BE |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Everlight | onsemi | onsemi | onsemi | onsemi | onsemi | onsemi | onsemi | Broadcom | Broadcom | Broadcom |
| Isolation Voltage | 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 |
| Max Output Voltage | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V |
| Max Output Current | 50mA | 80mA | 80mA | 80mA | 80mA | 80mA | 80mA | 80mA | 50mA | 50mA | 50mA |
| 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-SOIC (0.209", 5.30mm Width) | 4-SMD, Gull Wing | 4-SMD, Gull Wing |
| Operating Temperature | -55°C to 110°C | -40°C to 110°C | -40°C to 110°C | -40°C to 110°C | -40°C to 110°C | -40°C to 110°C | -40°C to 110°C | -40°C to 110°C | -55°C to 100°C | -55°C to 100°C | -55°C to 100°C |
| CTR Min @ 5mA | 150% | 50% | 100% | 50% | 100% | 100% | 50% | 100% @ 1mA | 50% | 80% | 130% |
| CTR Max @ 5mA | 300% | 600% | 300% | 150% | 200% | 200% | 600% | 1200% @ 1mA | 600% | 160% | 260% |
| Vce Saturation (Max) | 200mV | 400mV | 400mV | 400mV | 400mV | 400mV | 400mV | 400mV | 200mV | 200mV | 200mV |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
HCPL-181-00BE and HCPL-181-000E from Broadcom Limited are the closest electrical equivalents to the EL357NF(TB)-VG. Both maintain identical isolation voltage (3750Vrms), single-channel transistor output, and maximum output current (50mA). The HCPL-181-00BE features a Current Transfer Ratio range (130% to 260% @ 5mA) that closely aligns with the EL357NF(TB)-VG specification (150% to 300% @ 5mA). Both parts are RoHS3 compliant and active products.
Secondary Substitutes (Functional Equivalents):
FODM121AR2 and FODM121CR2 from onsemi provide functional equivalence with matching isolation voltage and transistor output configuration. These parts feature higher maximum output current (80mA) and are available in Tape & Reel packaging. FODM121AR2 offers a Current Transfer Ratio range (100% to 300% @ 5mA) that overlaps with the primary part specification. Both are RoHS3 compliant and active products.
Temperature Range Consideration:
The EL357NF(TB)-VG operates from -55°C to 110°C. onsemi FODM series parts operate from -40°C to 110°C, which represents a reduced lower temperature limit. Broadcom HCPL-181 series parts operate from -55°C to 100°C, which represents a reduced upper temperature limit. Application requirements must determine acceptability of these variations.
Package Compatibility:
All listed substitutes use 4-SMD gull wing surface mount packages compatible with EL357NF(TB)-VG footprints, with the exception of HCPL-181-000E which uses 4-SOIC packaging. PCB layout verification is required for HCPL-181-000E due to different lead pitch and body dimensions.
All substitute parts maintain RoHS3 compliance and active product status, ensuring regulatory and supply chain continuity.
Frequently Asked Questions (FAQ)
Q: Can FODM121 series parts directly replace the EL357NF(TB)-VG?
A: FODM121 series parts (FODM121, FODM121AR2, FODM121B, FODM121C, FODM121CR2, FODM121R2) meet the core electrical requirements: 3750Vrms isolation, single-channel transistor output, and 4-SMD gull wing package. However, they feature higher maximum output current (80mA vs. 50mA) and lower minimum operating temperature (-40°C vs. -55°C). Applications operating above -40°C and not requiring the full 50mA output current specification can use these parts.
Q: What is the difference between FODM121 and FODM124R2?
A: FODM124R2 differs in Current Transfer Ratio specification, measured at 1mA input current rather than 5mA. FODM124R2 specifies 100% to 1200% CTR @ 1mA, while FODM121 variants specify CTR @ 5mA. Both maintain identical isolation voltage, output configuration, and package type. Selection depends on input current drive capability in the application circuit.
Q: Are HCPL-181 series parts pin-compatible with EL357NF(TB)-VG?
A: HCPL-181-00AE and HCPL-181-00BE use 4-Mini-Flat packages with gull wing leads, which are mechanically compatible with standard 4-SMD footprints. HCPL-181-000E uses 4-SOIC packaging with different lead pitch (0.209" width) and requires PCB layout verification before substitution. Pin function compatibility is maintained across all variants.
Q: Which substitute offers the closest Current Transfer Ratio match?
A: HCPL-181-00BE provides the closest CTR specification match with 130% to 260% @ 5mA, compared to the EL357NF(TB)-VG specification of 150% to 300% @ 5mA. FODM121AR2 also provides good overlap with 100% to 300% @ 5mA. Both are suitable for applications with CTR-dependent circuit design.
Q: What packaging options are available for substitutes?
A: onsemi FODM121 variants are available in Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel® packaging. Broadcom HCPL-181 variants are available in Cut Tape (CT) & Digi-Reel® packaging. Packaging selection affects procurement lead time and minimum order quantities but does not affect electrical performance.
Q: Can I use FODM121 parts in applications requiring -55°C operation?
A: No. FODM121 series parts specify a minimum operating temperature of -40°C. Applications requiring -55°C operation must use EL357NF(TB)-VG or HCPL-181 series parts, which both support -55°C minimum temperature.
Q: Are all listed substitutes RoHS3 compliant?
A: Yes. All substitute parts listed are RoHS3 compliant. Broadcom HCPL-181 series parts also carry REACH Unaffected status. onsemi FODM121 series parts carry REACH Unaffected status. All parts are suitable for applications with RoHS3 compliance requirements.
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