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HMA121F Optoisolator Equivalent & Substitute Parts
Part Overview
The HMA121F is a 3750Vrms optoisolator with transistor output manufactured by onsemi in 4-SMD gull wing packaging. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. The HMA121F provides single-channel isolation suitable for DC input applications with 80V maximum output voltage and 80mA output current capability.
Substiute Parts
Key Parameters
| Parameter | HMA121F Specification |
|---|---|
| Voltage - Isolation | 3750Vrms |
| Number of Channels | 1 |
| Current Transfer Ratio (Min) | 100% @ 5mA |
| Current Transfer Ratio (Max) | 600% @ 5mA |
| Voltage - Output (Max) | 80V |
| Current - Output / Channel | 80mA |
| Vce Saturation (Max) | 400mV |
| Rise / Fall Time (Typ) | 3µs, 3µs |
| Operating Temperature | -40°C ~ 100°C |
| Mounting Type | Surface Mount |
| Package / Case | 4-SMD, Gull Wing |
| Input Type | DC |
| Output Type | Transistor |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the HMA121F is determined by the following critical parameters:
- Isolation Voltage: All substitutes must maintain 3750Vrms isolation rating
- Output Type: Transistor output configuration required
- Number of Channels: Single channel only
- Input Type: DC input only
- Maximum Output Voltage: 80V maximum
- Mounting Type: Surface mount required
- MSL Rating: Level 1 (Unlimited) preferred for compatibility
Substitute parts are grouped by package type (4-SOP, 4-SOIC, 4-Mini-Flat) while maintaining electrical equivalence. Current Transfer Ratio variations within the 3750Vrms class are acceptable provided the minimum CTR meets or exceeds application requirements. Output current capability ranges from 50mA to 80mA across substitutes; applications requiring 80mA must use HMA121F or EL357ND(TA)-G.
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage | CTR Min @ 5mA | CTR Max @ 5mA | Vce Sat (Max) | Output Current | Package | Operating Temp | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| HMA121F | onsemi | 3750Vrms | 100% | 600% | 400mV | 80mA | 4-SMD, Gull Wing | -40°C ~ 100°C | Obsolete |
| EL357ND(TA)-G | Everlight Electronics | 3750Vrms | 300% | 600% | 200mV | 50mA | 4-SOP (2.54mm) | -55°C ~ 110°C | Active |
| HCPL-181-000E | Broadcom Limited | 3750Vrms | 50% | 600% | 200mV | 50mA | 4-SOIC (0.209", 5.30mm) | -55°C ~ 100°C | Active |
| HCPL-181-00AE | Broadcom Limited | 3750Vrms | 80% | 160% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C | Active |
| HCPL-181-00BE | Broadcom Limited | 3750Vrms | 130% | 260% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C | Active |
| HCPL-181-00CE | Broadcom Limited | 3750Vrms | 200% | 400% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C | Active |
| HCPL-181-00DE | Broadcom Limited | 3750Vrms | 300% | 600% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C | Active |
| HCPL-181-06BE | Broadcom Limited | 3750Vrms | 130% | 260% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C | Active |
| HCPL-181-06DE | Broadcom Limited | 3750Vrms | 300% | 600% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C | Active |
| LTV-356T | Lite-On Inc. | 3750Vrms | 50% | 600% | 200mV | 50mA | 4-SOP | -55°C ~ 110°C | Active |
| PC357N4J000F | SHARP/Socle Technology | 3750Vrms | 300% | 600% | 200mV | 50mA | 4-Mini-Flat | -30°C ~ 100°C | Active |
Engineering Selection Recommendations
Primary Substitutes (Active Status, Broadcom HCPL-181 Series)
The HCPL-181 family from Broadcom Limited offers the broadest range of Current Transfer Ratio grades in active production. HCPL-181-00DE and HCPL-181-06DE provide 300% minimum CTR matching the upper range of HMA121F performance. All HCPL-181 variants are RoHS3 compliant and REACH unaffected. The 4-Mini-Flat package enables direct PCB layout compatibility with existing HMA121F designs.
Secondary Substitutes (Alternative Packages)
EL357ND(TA)-G from Everlight Electronics and LTV-356T from Lite-On Inc. provide 3750Vrms isolation in 4-SOP packaging. Both are active products with extended temperature ranges (-55°C to 110°C). EL357ND(TA)-G offers 300% minimum CTR; LTV-356T provides 50% minimum CTR. These options require PCB layout modification due to different pin spacing.
Output Current Limitation
All substitute parts except EL357ND(TA)-G are rated for 50mA maximum output current, compared to HMA121F's 80mA rating. Applications requiring 80mA output current must use HMA121F (if available from inventory) or EL357ND(TA)-G.
Temperature Range Considerations
HMA121F operates -40°C to 100°C. Substitutes with extended lower temperature range (-55°C) include all Broadcom HCPL-181 variants, EL357ND(TA)-G, and LTV-356T. PC357N4J000F operates -30°C to 100°C. Applications requiring operation below -40°C must use extended-range substitutes.
Frequently Asked Questions (FAQ)
Q: Can HCPL-181-00CE directly replace HMA121F in existing designs?
A: HCPL-181-00CE maintains 3750Vrms isolation, single-channel transistor output, and 4-Mini-Flat package compatibility. However, output current is limited to 50mA versus HMA121F's 80mA. Verify application current requirements before substitution. All electrical parameters (isolation voltage, output voltage, input type) are equivalent.
Q: What is the difference between HCPL-181-00DE and HCPL-181-06DE?
A: Both parts are electrically identical with 300% minimum and 600% maximum Current Transfer Ratio at 5mA. The suffix designates different packaging or tape configuration. Electrical performance and pin configuration are equivalent for circuit design purposes.
Q: Is EL357ND(TA)-G suitable for -40°C operation?
A: EL357ND(TA)-G is rated for -55°C to 110°C operation, which includes -40°C. This part is suitable for applications requiring the full HMA121F temperature range and lower.
Q: Why do some substitutes have lower minimum CTR than HMA121F?
A: Current Transfer Ratio grades (50%, 80%, 100%, 130%, 200%, 300%) represent different manufacturing bins of the same die. Lower CTR grades are acceptable if application circuits are designed for minimum CTR operation. Higher CTR grades provide design margin but are not required for substitution compatibility.
Q: Can I use 4-SOP packaged parts (EL357ND(TA)-G, LTV-356T) as direct replacements?
A: 4-SOP and 4-Mini-Flat packages have different pin spacing and footprints. PCB layout modification is required. Electrical substitution is valid; mechanical redesign is necessary.
Q: Are all substitute parts RoHS compliant?
A: All listed substitutes are RoHS3 compliant. HMA121F status is not specified in provided data. Broadcom HCPL-181 series explicitly states RoHS3 compliance. Everlight EL357ND(TA)-G, Lite-On LTV-356T, and SHARP PC357N4J000F are RoHS3 compliant.
Q: What is the inventory status for substitutes?
A: HCPL-181-00BE has highest availability (103,100 pcs). PC357N4J000F (163,625 pcs) and HCPL-181-00DE (44,400 pcs) offer substantial stock. All listed substitutes are in active production with current inventory.
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