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HMA121AV Equivalent & Substitute Parts
Part Overview
The HMA121AV is an optoisolator with transistor output manufactured by onsemi, rated for 3750Vrms isolation voltage with 1 channel configuration in 4-SMD gull wing packaging. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The part delivers 80mA output current with a current transfer ratio of 100–300% at 5mA input, suitable for high-voltage isolation applications requiring DC input switching.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Isolation Voltage | 3750Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Current Transfer Ratio (Min–Max) | 100–300% @ 5mA |
| Output Voltage (Max) | 80V |
| Output Current / Channel | 80mA |
| Vce Saturation (Max) | 400mV |
| Operating Temperature Range | −40°C to 100°C |
| Mounting Type | Surface Mount |
| Package / Case | 4-SMD, Gull Wing |
| Input Type | DC |
| Rise / Fall Time | 3µs / 3µs |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by the following criteria:
Primary Matching Criteria:
- Isolation voltage: 3750Vrms (exact match required)
- Number of channels: 1 (exact match required)
- Output type: Transistor (exact match required)
- Input type: DC (exact match required)
- Mounting type: Surface Mount (exact match required)
Secondary Compatibility Criteria:
- Output voltage (Max): ≥80V
- Output current / channel: ≥80mA (or ≥50mA for reduced-current applications)
- Vce saturation: ≤400mV (lower values acceptable)
- Operating temperature range: Must encompass or exceed −40°C to 100°C
- Current transfer ratio: Must support the application's input current requirements
- Package compatibility: Physical footprint and pin configuration must match PCB design
Substitutes are grouped by package type (4-SMD vs. 4-SOP vs. 4-SOIC vs. 4-Mini-Flat) and current transfer ratio bands to facilitate selection based on design constraints.
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage | CTR Min–Max @ 5mA | Output Current | Vce Sat (Max) | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|
| HMA121AV | onsemi | 3750Vrms | 100–300% | 80mA | 400mV | −40 to 100°C | 4-SMD, Gull Wing | Obsolete |
| FODM121AV | onsemi | 3750Vrms | 100–300% | 80mA | 400mV | −40 to 110°C | 4-SMD, Gull Wing | Active |
| EL357ND(TA)-G | Everlight Electronics | 3750Vrms | 300–600% | 50mA | 200mV | −55 to 110°C | 4-SOP (2.54mm) | Active |
| HCPL-181-000E | Broadcom Limited | 3750Vrms | 50–600% | 50mA | 200mV | −55 to 100°C | 4-SOIC (0.209", 5.30mm) | Active |
| HCPL-181-00AE | Broadcom Limited | 3750Vrms | 80–160% | 50mA | 200mV | −55 to 100°C | 4-Mini-Flat | Active |
| HCPL-181-00BE | Broadcom Limited | 3750Vrms | 130–260% | 50mA | 200mV | −55 to 100°C | 4-Mini-Flat | Active |
| HCPL-181-00CE | Broadcom Limited | 3750Vrms | 200–400% | 50mA | 200mV | −55 to 100°C | 4-Mini-Flat | Active |
| HCPL-181-00DE | Broadcom Limited | 3750Vrms | 300–600% | 50mA | 200mV | −55 to 100°C | 4-Mini-Flat | Active |
| HCPL-181-06BE | Broadcom Limited | 3750Vrms | 130–260% | 50mA | 200mV | −55 to 100°C | 4-Mini-Flat | Active |
| HCPL-181-06DE | Broadcom Limited | 3750Vrms | 300–600% | 50mA | 200mV | −55 to 100°C | 4-Mini-Flat | Active |
| LTV-356T | Lite-On Inc. | 3750Vrms | 50–600% | 50mA | 200mV | −55 to 110°C | 4-SOP | Active |
Engineering Selection Recommendations
Direct Replacement (Same Package, Active Status): FODM121AV is the primary substitute for HMA121AV. Both are onsemi products in 4-SMD gull wing packaging with identical electrical specifications (100–300% CTR, 80mA output current, 400mV Vce saturation). FODM121AV is active and carries RoHS3 compliance, making it suitable for new designs requiring the same footprint and performance envelope.
Package-Variant Substitutes (Active Status, Different Packages): Broadcom HCPL-181 series (−00AE, −00BE, −00CE, −00DE, −06BE, −06DE) and Lite-On LTV-356T offer active alternatives with 4-Mini-Flat and 4-SOP packages respectively. These require PCB layout modification but provide superior availability and RoHS3 compliance. Current transfer ratio variants within the HCPL-181 family (80–600% range) allow selection based on input current requirements. Output current is reduced to 50mA; applications requiring 80mA must remain with FODM121AV or HMA121AV.
Extended Temperature Range Option: EL357ND(TA)-G (Everlight) and LTV-356T (Lite-On) support −55°C to 110°C operation, exceeding the HMA121AV range. These are suitable for applications requiring wider temperature margins. EL357ND(TA)-G delivers 300–600% CTR with 200mV Vce saturation in 4-SOP packaging.
Compliance Considerations: All active substitutes carry RoHS3 compliance. FODM121AV and HCPL-181 series are REACH Unaffected. Moisture sensitivity level remains 1 (Unlimited) across all candidates.
Frequently Asked Questions (FAQ)
Q: Can HCPL-181-00BE replace HMA121AV directly on the PCB? A: No. HCPL-181-00BE uses 4-Mini-Flat packaging versus HMA121AV's 4-SMD gull wing. Physical footprint and pin layout differ, requiring PCB redesign. Electrical specifications are compatible (3750Vrms isolation, 1 channel, transistor output, DC input).
Q: What is the difference between HCPL-181-00BE and HCPL-181-00DE? A: Both use 4-Mini-Flat packaging and operate at 3750Vrms isolation. The primary difference is current transfer ratio: HCPL-181-00BE delivers 130–260% CTR at 5mA, while HCPL-181-00DE delivers 300–600% CTR. Select based on input current availability and required switching speed.
Q: Is FODM121AV a true drop-in replacement for HMA121AV? A: Yes. FODM121AV matches HMA121AV in package (4-SMD gull wing), isolation voltage (3750Vrms), output current (80mA), and current transfer ratio (100–300%). Operating temperature extends to 110°C (versus 100°C for HMA121AV). FODM121AV is active and RoHS3 compliant.
Q: Why do some substitutes have lower output current (50mA vs. 80mA)? A: Broadcom HCPL-181 and Lite-On LTV-356T are rated for 50mA maximum output current. Applications requiring 80mA output must use FODM121AV or remain with HMA121AV. Verify load current requirements before selection.
Q: Can I use EL357ND(TA)-G in a −40°C to 100°C application? A: Yes. EL357ND(TA)-G operates from −55°C to 110°C, which encompasses the −40°C to 100°C range. However, the 4-SOP (2.54mm) package differs from HMA121AV's 4-SMD gull wing, requiring PCB modification.
Q: What does "Current Transfer Ratio (CTR)" mean in optoisolator selection? A: CTR is the ratio of output collector current to input LED current, expressed as a percentage. Higher CTR (e.g., 300–600%) allows lower input current to achieve the same output switching. Lower CTR (e.g., 50–100%) requires higher input current. Select based on available input drive capability.
Q: Are all listed substitutes RoHS3 compliant? A: All active substitutes (FODM121AV, HCPL-181 series, EL357ND(TA)-G, LTV-356T) carry RoHS3 compliance. HMA121AV (obsolete) does not list RoHS status.
Q: What is the significance of Moisture Sensitivity Level (MSL) 1? A: MSL 1 (Unlimited) indicates the component has no moisture sensitivity restrictions. No baking or special storage conditions are required before soldering, simplifying supply chain and assembly logistics.
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