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HMA124 Optoisolator Equivalent & Substitute Parts
Part Overview
The HMA124 is a 3750Vrms optoisolator with transistor output manufactured by onsemi in a 4-SMD package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The HMA124 provides single-channel isolation suitable for DC input applications with 80mA output current capability and 80V maximum output voltage.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Isolation | 3750Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Voltage - Output (Max) | 80V |
| Current - Output / Channel | 80mA |
| Input Type | DC |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C ~ 100°C |
| Vce Saturation (Max) | 400mV |
| Current Transfer Ratio (Min) | 100% @ 1mA |
| Current Transfer Ratio (Max) | 1200% @ 1mA |
Substitute Part Grouping Explanation
Substitution for the HMA124 is determined by the following critical parameters:
- Voltage isolation rating of 3750Vrms
- Single-channel configuration
- Transistor output topology
- Maximum output voltage of 80V
- DC input type
- Surface mount technology
- Operating temperature compatibility
Substitute parts are grouped into two categories:
Direct Functional Equivalent: FODM124 (onsemi) maintains identical electrical specifications and package form factor, with the primary distinction being active product status and extended operating temperature range to 110°C.
Compatible Alternatives: HCPL-181 series (Broadcom), EL357ND(TA)-G (Everlight), and LTV-356T (Lite-On) meet the core isolation voltage, channel count, output type, and voltage/current ratings. These alternatives differ in package configuration, current transfer ratio ranges, and saturation voltage characteristics, requiring design verification for specific application requirements.
Parameter Comparison
| Parameter | HMA124 | FODM124 | EL357ND(TA)-G | HCPL-181-000E | HCPL-181-00BE | LTV-356T |
|---|---|---|---|---|---|---|
| Manufacturer | onsemi | onsemi | Everlight | Broadcom | Broadcom | Lite-On |
| Voltage - Isolation | 3750Vrms | 3750Vrms | 3750Vrms | 3750Vrms | 3750Vrms | 3750Vrms |
| Number of Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Output Type | Transistor | Transistor | Transistor | Transistor | Transistor | Transistor |
| Voltage - Output (Max) | 80V | 80V | 80V | 80V | 80V | 80V |
| Current - Output / Channel | 80mA | 80mA | 50mA | 50mA | 50mA | 50mA |
| Input Type | DC | DC | DC | DC | DC | DC |
| Vce Saturation (Max) | 400mV | 400mV | 200mV | 200mV | 200mV | 200mV |
| Current Transfer Ratio (Min) | 100% @ 1mA | 100% @ 1mA | 300% @ 5mA | 50% @ 5mA | 130% @ 5mA | 50% @ 5mA |
| Current Transfer Ratio (Max) | 1200% @ 1mA | 1200% @ 1mA | 600% @ 5mA | 600% @ 5mA | 260% @ 5mA | 600% @ 5mA |
| Operating Temperature | -40°C ~ 100°C | -40°C ~ 110°C | -55°C ~ 110°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 110°C |
| Package / Case | 4-SMD, Gull Wing | 4-SMD, Gull Wing | 4-SOP (2.54mm) | 4-SOIC (0.209", 5.30mm Width) | 4-Mini-Flat | 4-SOP |
| Product Status | Obsolete | Active | Active | Active | Active | Active |
| RoHS Status | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
FODM124 is the primary direct substitute for HMA124. Both components are manufactured by onsemi with identical electrical specifications. FODM124 is actively produced and ROHS3 compliant, addressing the obsolescence of HMA124. The extended operating temperature range (-40°C to 110°C versus -40°C to 100°C) provides additional thermal margin. Packaging and pinout are identical, enabling direct board-level replacement without design modification.
HCPL-181 series (Broadcom) offers active production status and ROHS3 compliance across multiple current transfer ratio grades (HCPL-181-00AE, HCPL-181-00BE, HCPL-181-00CE, HCPL-181-00DE, HCPL-181-06BE, HCPL-181-06DE). All variants maintain 3750Vrms isolation, single-channel transistor output, and 80V maximum output voltage. Output current is reduced to 50mA, and Vce saturation is improved to 200mV maximum. Package variants include 4-SOIC and 4-Mini-Flat configurations. Selection among HCPL-181 variants depends on required current transfer ratio range and package compatibility with existing PCB layouts.
EL357ND(TA)-G (Everlight) and LTV-356T (Lite-On) provide alternative sources with identical isolation voltage and output specifications. Both are actively produced and ROHS3 compliant. Output current is 50mA, and Vce saturation is 200mV. Package configurations differ from HMA124 (4-SOP format), requiring PCB redesign. Extended operating temperature to 110°C is available with both alternatives.
Selection criteria prioritize active product status, ROHS3 compliance, and thermal operating range. Package compatibility determines whether direct board replacement is feasible or PCB layout modification is required.
Frequently Asked Questions (FAQ)
Q: Can FODM124 directly replace HMA124 on existing PCBs?
A: Yes. FODM124 maintains identical pinout, package configuration (4-SMD Gull Wing), and electrical specifications with HMA124. No PCB modification is required for direct substitution.
Q: What is the primary difference between HMA124 and FODM124?
A: HMA124 is obsolete; FODM124 is actively manufactured. FODM124 extends the operating temperature range to 110°C and carries ROHS3 compliance certification. Electrical performance is identical.
Q: Why do HCPL-181 variants show different current transfer ratios?
A: Broadcom manufactures HCPL-181 in multiple grades optimized for different application requirements. HCPL-181-00AE (80-160%), HCPL-181-00BE (130-260%), HCPL-181-00CE (200-400%), and HCPL-181-00DE (300-600%) allow selection based on required gain characteristics. All maintain 3750Vrms isolation and 80V output voltage.
Q: Can EL357ND(TA)-G or LTV-356T be used as drop-in replacements?
A: Electrical substitution is feasible; however, package format differs from HMA124. EL357ND(TA)-G uses 4-SOP (2.54mm) and LTV-356T uses 4-SOP configuration, requiring PCB layout redesign. Pinout compatibility must be verified before implementation.
Q: What is the impact of reduced output current in alternative parts?
A: EL357ND(TA)-G, HCPL-181 series, and LTV-356T are rated for 50mA maximum output current versus HMA124's 80mA. Applications requiring output currents exceeding 50mA cannot use these alternatives without external buffering or redesign.
Q: Are all substitute parts ROHS3 compliant?
A: FODM124, HCPL-181 series, EL357ND(TA)-G, and LTV-356T are all ROHS3 compliant. HMA124 compliance status is not specified in available documentation.
Q: Which substitute offers the best thermal performance?
A: EL357ND(TA)-G and LTV-356T extend operating temperature to -55°C to 110°C, providing the widest thermal range. FODM124 operates to -40°C to 110°C. HCPL-181 series operates to -55°C to 100°C. Selection depends on specific application temperature requirements.
Q: What is the significance of Vce saturation differences?
A: HMA124 and FODM124 specify 400mV maximum Vce saturation. HCPL-181 series, EL357ND(TA)-G, and LTV-356T specify 200mV maximum. Lower saturation voltage reduces power dissipation in the output transistor, improving efficiency in high-frequency switching applications.
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