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HMA121DV Equivalent & Substitute Parts
Part Overview
The HMA121DV is a 3750Vrms optoisolator with transistor output manufactured by onsemi in a 4-SMD gull wing package. This component provides galvanic isolation for single-channel DC input applications with a maximum output current of 80mA and output voltage rating of 80V. The product is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing production support.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Isolation Voltage | 3750Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Input Type | DC |
| Current Transfer Ratio (Min) | 50% @ 5mA |
| Current Transfer Ratio (Max) | 100% @ 5mA |
| Voltage - Output (Max) | 80V |
| Current - Output / Channel | 80mA |
| Vce Saturation (Max) | 400mV |
| Operating Temperature Range | -40°C ~ 100°C |
| Mounting Type | Surface Mount |
| Package / Case | 4-SMD, Gull Wing |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the HMA121DV is determined by strict equivalence in the following core parameters:
- Isolation Voltage: 3750Vrms (all substitutes match)
- Number of Channels: 1 (all substitutes match)
- Output Type: Transistor (all substitutes match)
- Input Type: DC (all substitutes match)
- Maximum Output Voltage: 80V (all substitutes match)
- Maximum Output Current: 50mA or higher (all substitutes meet or exceed)
- Mounting Type: Surface Mount (all substitutes match)
- Moisture Sensitivity Level: 1 (all substitutes match)
Substitute parts are grouped by package type: 4-SOP (2.54mm), 4-SOIC (0.209", 5.30mm Width), and 4-Mini-Flat. All substitutes maintain the same isolation voltage, channel count, and output characteristics. Current Transfer Ratio specifications vary across substitutes but all meet minimum requirements for DC input applications. Vce Saturation values are lower in substitute parts (200mV vs. 400mV), indicating improved performance characteristics.
Parameter Comparison
| Parameter | HMA121DV | EL357ND(TA)-G | HCPL-181-000E | HCPL-181-00AE | HCPL-181-00BE | HCPL-181-00CE | HCPL-181-00DE | HCPL-181-06BE | HCPL-181-06DE | LTV-356T | PC357N4J000F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | Everlight Electronics | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Broadcom Limited | Lite-On Inc. | SHARP/Socle Technology |
| 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 |
| CTR Min @ 5mA | 50% | 300% | 50% | 80% | 130% | 200% | 300% | 130% | 300% | 50% | 300% |
| CTR Max @ 5mA | 100% | 600% | 600% | 160% | 260% | 400% | 600% | 260% | 600% | 600% | 600% |
| Voltage - Output (Max) | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V | 80V |
| Current - Output / Channel | 80mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA | 50mA |
| Vce Saturation (Max) | 400mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV | 200mV |
| Rise / Fall Time (Typ) | 3µs, 3µs | 3µs, 4µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs | 4µs, 3µs |
| Operating Temperature | -40°C ~ 100°C | -55°C ~ 110°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 100°C | -55°C ~ 110°C | -30°C ~ 100°C |
| Package / Case | 4-SMD, Gull Wing | 4-SOP (2.54mm) | 4-SOIC (0.209", 5.30mm) | 4-Mini-Flat | 4-Mini-Flat | 4-Mini-Flat | 4-Mini-Flat | 4-Mini-Flat | 4-Mini-Flat | 4-SOP | 4-Mini-Flat |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | REACH Unaffected | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
All listed substitute parts are functionally equivalent to the HMA121DV for applications requiring 3750Vrms isolation with single-channel transistor output and DC input. The primary selection criteria are package compatibility and product availability.
Package Considerations:
- 4-Mini-Flat Package: HCPL-181-00AE, HCPL-181-00BE, HCPL-181-00CE, HCPL-181-00DE, HCPL-181-06BE, HCPL-181-06DE, and PC357N4J000F offer the closest form factor to the original 4-SMD gull wing package. These are suitable for direct PCB layout compatibility with minimal redesign.
- 4-SOP Package: EL357ND(TA)-G and LTV-356T use 4-SOP (2.54mm) packaging, which requires PCB footprint modification but maintains surface mount compatibility.
- 4-SOIC Package: HCPL-181-000E uses 4-SOIC (0.209", 5.30mm Width) packaging, requiring the most significant PCB layout changes.
Compliance and Availability: All substitute parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). The HCPL-181 series from Broadcom Limited offers the highest inventory levels (ranging from 1,174 to 103,100 pieces), providing supply chain stability. PC357N4J000F from SHARP/Socle Technology also maintains substantial inventory (163,625 pieces).
Performance Characteristics: All substitutes provide improved Vce Saturation (200mV maximum) compared to the HMA121DV (400mV maximum), resulting in lower power dissipation. Current Transfer Ratio specifications vary across substitutes; select based on application requirements for input current and output switching characteristics.
Frequently Asked Questions (FAQ)
Q: Can I use any of these substitute parts as a direct replacement for the HMA121DV?
A: All listed parts meet the core electrical requirements (3750Vrms isolation, single-channel transistor output, DC input, 80V maximum output voltage). However, package differences require PCB footprint verification. The 4-Mini-Flat variants offer the closest physical compatibility with the original 4-SMD gull wing package.
Q: What is the main difference between the HCPL-181 variants (00AE, 00BE, 00CE, 00DE, 06BE, 06DE)?
A: These parts differ in Current Transfer Ratio specifications at 5mA input current. HCPL-181-00AE has 80-160% CTR, HCPL-181-00BE and HCPL-181-06BE have 130-260% CTR, HCPL-181-00CE has 200-400% CTR, and HCPL-181-00DE and HCPL-181-06DE have 300-600% CTR. Select based on your circuit's input current and output switching speed requirements.
Q: Why does the HMA121DV have a higher maximum output current (80mA) than the substitutes (50mA)?
A: The HMA121DV specification lists 80mA output current, while all substitutes are rated for 50mA. For applications requiring output currents above 50mA, circuit redesign or alternative component selection may be necessary. For applications operating at or below 50mA, all substitutes are suitable.
Q: Are there temperature range differences I should consider?
A: The HMA121DV operates from -40°C to 100°C. Most substitutes extend the lower temperature limit to -55°C. EL357ND(TA)-G and LTV-356T extend the upper temperature limit to 110°C. PC357N4J000F operates from -30°C to 100°C. Select based on your application's thermal requirements.
Q: What is the difference between the 4-Mini-Flat and 4-SOP packages?
A: The 4-Mini-Flat package (used by most HCPL-181 variants and PC357N4J000F) is a compact surface mount package with gull wing leads. The 4-SOP package (used by EL357ND(TA)-G and LTV-356T) has a 2.54mm pitch and different lead geometry. Both are surface mount compatible but require different PCB footprints.
Q: Which substitute offers the best supply availability?
A: PC357N4J000F from SHARP/Socle Technology has the highest reported inventory at 163,625 pieces. Within the Broadcom HCPL-181 series, HCPL-181-00BE and HCPL-181-00DE offer the largest stock levels at 103,100 and 44,400 pieces respectively.
Q: Do all substitutes meet RoHS compliance?
A: Yes, all substitute parts are ROHS3 compliant. The original HMA121DV is listed as REACH Unaffected. All substitutes maintain REACH Unaffected status or ROHS3 compliance, suitable for regulated applications.
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