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FODM121AV Optoisolator Equivalent & Substitute Parts
Part Overview
The FODM121AV is an active optoisolator transistor output device manufactured by onsemi, rated for 3750Vrms isolation voltage in a 4-SMD gull wing package. This single-channel optoisolator is designed for DC input applications requiring galvanic isolation with transistor output switching capability. The part is currently in active production status with 1168 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across different manufacturers and package configurations while meeting the same isolation voltage, output voltage, and current specifications.
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 | 80mA |
| Current Transfer Ratio (Min) | 100% @ 5mA |
| Current Transfer Ratio (Max) | 300% @ 5mA |
| Operating Temperature Range | -40°C to 110°C |
| Package Type | 4-SMD, Gull Wing |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the FODM121AV are classified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are: (1) isolation voltage of 3750Vrms, (2) single-channel transistor output configuration, (3) DC input type, (4) maximum output voltage of 80V, (5) output current capability, (6) current transfer ratio range, and (7) surface mount package compatibility. Parts are grouped into two categories: parametric equivalents from the same manufacturer with identical specifications, and similar parts from alternative manufacturers that maintain the critical electrical parameters while potentially differing in package form factor or current transfer ratio specifications.
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage | CTR Min @ 5mA | CTR Max @ 5mA | Output Current | Vce Sat (Max) | Package | Temp Range | Inventory |
|---|---|---|---|---|---|---|---|---|---|
| FODM121AV | onsemi | 3750Vrms | 100% | 300% | 80mA | 400mV | 4-SMD, Gull Wing | -40°C to 110°C | 1168 |
| FODM121A | onsemi | 3750Vrms | 100% | 300% | 80mA | 400mV | 4-SMD, Gull Wing | -40°C to 110°C | 1496 |
| HCPL-181-000E | Broadcom Limited | 3750Vrms | 50% | 600% | 50mA | 200mV | 4-SOIC | -55°C to 100°C | 47300 |
| HCPL-181-00AE | Broadcom Limited | 3750Vrms | 80% | 160% | 50mA | 200mV | 4-Mini-Flat | -55°C to 100°C | 1607 |
| HCPL-181-00BE | Broadcom Limited | 3750Vrms | 130% | 260% | 50mA | 200mV | 4-Mini-Flat | -55°C to 100°C | 103100 |
| HCPL-181-00CE | Broadcom Limited | 3750Vrms | 200% | 400% | 50mA | 200mV | 4-Mini-Flat | -55°C to 100°C | 1174 |
| HCPL-181-00DE | Broadcom Limited | 3750Vrms | 300% | 600% | 50mA | 200mV | 4-Mini-Flat | -55°C to 100°C | 44400 |
| HCPL-181-06BE | Broadcom Limited | 3750Vrms | 130% | 260% | 50mA | 200mV | 4-Mini-Flat | -55°C to 100°C | 3806 |
| HCPL-181-06DE | Broadcom Limited | 3750Vrms | 300% | 600% | 50mA | 200mV | 4-Mini-Flat | -55°C to 100°C | 1240 |
| LTV-356T | Lite-On Inc. | 3750Vrms | 50% | 600% | 50mA | 200mV | 4-SOP | -55°C to 110°C | 5856 |
| PC357N4J000F | SHARP/Socle Technology | 3750Vrms | 300% | 600% | 50mA | 200mV | 4-Mini-Flat | -30°C to 100°C | 163625 |
Engineering Selection Recommendations
Parametric Equivalent (Direct Replacement): FODM121A is a parametric equivalent to FODM121AV from onsemi, maintaining identical electrical specifications and package configuration. Both parts are ROHS3 compliant and carry active product status. This part is suitable for direct substitution without circuit redesign.
Alternative Manufacturers with Package Considerations: Broadcom Limited HCPL-181 series parts maintain 3750Vrms isolation voltage and transistor output configuration. These parts are available in 4-Mini-Flat and 4-SOIC packages rather than the original 4-SMD gull wing configuration. The HCPL-181-00BE and HCPL-181-06BE variants provide current transfer ratios (130%-260%) that overlap with the FODM121AV specification range. All HCPL-181 variants are ROHS3 compliant and active products. Package footprint differences require PCB layout verification.
Extended Temperature Range Option: LTV-356T from Lite-On Inc. maintains 3750Vrms isolation and 80V maximum output voltage in a 4-SOP package. This part extends the upper operating temperature to 110°C, matching the FODM121AV maximum. Current transfer ratio range (50%-600%) encompasses the original specification. ROHS3 compliant and active status confirmed.
High-Volume Availability: PC357N4J000F from SHARP/Socle Technology offers the highest inventory level (163625 units) with 3750Vrms isolation, 300%-600% current transfer ratio, and 4-Mini-Flat package. Operating temperature range is -30°C to 100°C. ROHS3 compliant and active product status.
Frequently Asked Questions (FAQ)
Q: Can FODM121A replace FODM121AV directly? A: Yes. FODM121A is a parametric equivalent with identical isolation voltage (3750Vrms), current transfer ratio range (100%-300% @ 5mA), output current (80mA), package type (4-SMD gull wing), and operating temperature range (-40°C to 110°C). No circuit modifications are required.
Q: What are the key differences between FODM121AV and Broadcom HCPL-181 series? A: The primary differences are package form factor and output current rating. FODM121AV uses 4-SMD gull wing with 80mA output current, while HCPL-181 variants use 4-Mini-Flat or 4-SOIC packages with 50mA output current. Isolation voltage (3750Vrms) and output voltage (80V maximum) remain identical. Current transfer ratio varies by HCPL-181 variant suffix.
Q: Which substitute part has the closest current transfer ratio match? A: HCPL-181-00CE (200%-400% @ 5mA) and HCPL-181-00DE (300%-600% @ 5mA) provide overlapping current transfer ratio ranges with FODM121AV (100%-300% @ 5mA). HCPL-181-00BE (130%-260% @ 5mA) also falls within acceptable overlap.
Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the FODM121AV specification.
Q: What package considerations apply when substituting with Broadcom or Lite-On parts? A: Broadcom HCPL-181 series uses 4-Mini-Flat or 4-SOIC packages instead of the original 4-SMD gull wing. Lite-On LTV-356T uses 4-SOP package. PCB footprint and land pattern verification is required before design implementation. Pin configuration remains compatible across all listed parts.
Q: Which substitute offers the best inventory availability? A: PC357N4J000F from SHARP/Socle Technology has the highest inventory level at 163625 units. HCPL-181-00DE from Broadcom is the second option with 44400 units available.
Q: Can I use LTV-356T if my application requires -40°C minimum operating temperature? A: No. LTV-356T operates from -55°C to 110°C, which covers the -40°C requirement. However, verify your specific application's lower temperature limit before selection.
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