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HMA121EV Optoisolator Equivalent & Substitute Parts
Part Overview
The HMA121EV is a 3750Vrms optoisolator with transistor output manufactured by onsemi in a 4-SMD gull wing package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The HMA121EV provides single-channel isolation suitable for DC input applications with 80V maximum output voltage and 80mA output current capability.
Substiute Parts
Key Parameters
| Parameter | HMA121EV |
|---|---|
| Voltage - Isolation | 3750Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Current Transfer Ratio (Min) | 150% @ 5mA |
| Current Transfer Ratio (Max) | 300% @ 5mA |
| Voltage - Output (Max) | 80V |
| Current - Output / Channel | 80mA |
| Vce Saturation (Max) | 400mV |
| Operating Temperature | -40°C ~ 100°C |
| Mounting Type | Surface Mount |
| Package / Case | 4-SMD, Gull Wing |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the HMA121EV is determined by the following critical parameters:
- Isolation Voltage: 3750Vrms (all substitutes match this specification)
- Number of Channels: 1 (single-channel requirement)
- Output Type: Transistor (all substitutes provide transistor output)
- Input Type: DC (all substitutes support DC input)
- Maximum Output Voltage: 80V (all substitutes rated for 80V)
- Mounting Type: Surface Mount (all substitutes are surface mount)
- Moisture Sensitivity Level: 1 (Unlimited) (all substitutes meet or exceed this rating)
Substitute parts are grouped by package type and current transfer ratio performance bands. The HMA121EV operates in the 150–300% CTR range. Substitutes with overlapping or superior CTR ranges and compatible packages are electrically interchangeable. Package variations (4-SOP, 4-SOIC, 4-Mini-Flat) require PCB layout verification but do not affect electrical function.
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage | CTR Min @ 5mA | CTR Max @ 5mA | Vce Sat (Max) | Output Current | Package Type | Operating Temp | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| HMA121EV | onsemi | 3750Vrms | 150% | 300% | 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
Direct Electrical Equivalents (CTR Range Overlap)
HCPL-181-00BE and HCPL-181-06BE provide the closest CTR match to the HMA121EV (130–260% vs. 150–300%). Both are active Broadcom products with RoHS3 compliance and unlimited MSL rating. These are suitable for direct substitution in applications where the HMA121EV's 80mA output current is not exceeded by the 50mA limit of the substitute.
HCPL-181-00CE offers a higher CTR band (200–400%) that encompasses the HMA121EV's nominal range and provides superior performance margin. This part is active and widely available.
Higher Performance Alternatives
HCPL-181-00DE, HCPL-181-06DE, EL357ND(TA)-G, and PC357N4J000F all operate in the 300–600% CTR range, providing enhanced current transfer efficiency. These parts are suitable for applications where improved isolation margin or faster switching response is beneficial. Output current is limited to 50mA.
Package Considerations
The HMA121EV uses a 4-SMD gull wing package. Broadcom HCPL-181 variants in 4-Mini-Flat package maintain the same footprint and pinout. The 4-SOP and 4-SOIC packages (EL357ND(TA)-G, HCPL-181-000E, LTV-356T) require PCB layout modification but are electrically compatible.
Compliance and Availability
All substitute parts are active products with RoHS3 compliance and unlimited MSL rating. Broadcom HCPL-181 series parts have the highest inventory availability (1,174–103,100 units). PC357N4J000F offers the largest stock (163,625 units).
Frequently Asked Questions (FAQ)
Q: Can I use HCPL-181-00DE as a direct replacement for HMA121EV?
A: Yes, electrically. The HCPL-181-00DE meets all isolation voltage, channel count, output type, and temperature requirements. The 4-Mini-Flat package is compatible with the HMA121EV's 4-SMD gull wing footprint. However, the 50mA output current limit must not be exceeded in your application. The higher CTR range (300–600%) provides improved performance margin.
Q: What is the difference between HCPL-181-00BE and HCPL-181-00CE?
A: Both are Broadcom 4-Mini-Flat optoisolators with 3750Vrms isolation. The primary difference is current transfer ratio: HCPL-181-00BE operates at 130–260% CTR, while HCPL-181-00CE operates at 200–400% CTR. HCPL-181-00CE provides a wider performance band that better matches the HMA121EV's 150–300% specification.
Q: Does package type affect electrical performance?
A: No. Package type (4-SMD, 4-SOP, 4-SOIC, 4-Mini-Flat) is a mechanical consideration only. All packages with matching electrical specifications are functionally equivalent. Package selection depends on PCB layout compatibility and assembly process requirements.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All listed substitute parts carry RoHS3 compliance certification. The HMA121EV is marked as REACH Unaffected; all active substitutes also carry REACH Unaffected or RoHS3 Compliant status.
Q: What is the significance of Current Transfer Ratio (CTR)?
A: CTR defines the ratio of output collector current to input LED current. Higher CTR indicates more efficient current transfer and better isolation performance. The HMA121EV operates at 150–300% CTR. Substitutes with overlapping or higher CTR ranges maintain or improve performance.
Q: Can I use LTV-356T in place of HMA121EV?
A: Yes, electrically. The LTV-356T is a Lite-On active product with 3750Vrms isolation, 4-SOP package, and 50–600% CTR range. The wider CTR band accommodates the HMA121EV's 150–300% specification. The 4-SOP package requires PCB layout verification.
Q: What is Moisture Sensitivity Level (MSL)?
A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed parts meet this specification.
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