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HMA121BV Optoisolator Equivalent & Substitute Parts
Part Overview
The HMA121BV 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 HMA121BV provides single-channel isolation suitable for DC input applications with 80V maximum output voltage and 80mA output current capability.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Isolation | 3750Vrms |
| Number of Channels | 1 |
| Current Transfer Ratio (Min) | 50% @ 5mA |
| Current Transfer Ratio (Max) | 150% @ 5mA |
| Output Type | Transistor |
| 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 |
Substitute Part Grouping Explanation
Substitution for the HMA121BV is determined by strict equivalence in the following parameters:
- Voltage - Isolation: 3750Vrms (mandatory match)
- Number of Channels: 1 (mandatory match)
- Output Type: Transistor (mandatory match)
- Voltage - Output (Max): 80V (mandatory match)
- Input Type: DC (mandatory match)
- Mounting Type: Surface Mount (mandatory match)
Current Transfer Ratio, output current capability, saturation voltage, and operating temperature ranges may vary among substitutes while maintaining functional compatibility. Package form factors (4-SMD, 4-SOP, 4-SOIC, 4-Mini-Flat) are interchangeable in surface mount applications provided PCB layout accommodates the specific package dimensions.
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage | CTR Min @ 5mA | CTR Max @ 5mA | Vce Sat (Max) | Output Current | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| HMA121BV | onsemi | 3750Vrms | 50% | 150% | 400mV | 80mA | -40°C ~ 100°C | 4-SMD | Obsolete |
| EL357ND(TA)-G | Everlight Electronics | 3750Vrms | 300% | 600% | 200mV | 50mA | -55°C ~ 110°C | 4-SOP | Active |
| HCPL-181-000E | Broadcom Limited | 3750Vrms | 50% | 600% | 200mV | 50mA | -55°C ~ 100°C | 4-SOIC | Active |
| HCPL-181-00AE | Broadcom Limited | 3750Vrms | 80% | 160% | 200mV | 50mA | -55°C ~ 100°C | 4-Mini-Flat | Active |
| HCPL-181-00BE | Broadcom Limited | 3750Vrms | 130% | 260% | 200mV | 50mA | -55°C ~ 100°C | 4-Mini-Flat | Active |
| HCPL-181-00CE | Broadcom Limited | 3750Vrms | 200% | 400% | 200mV | 50mA | -55°C ~ 100°C | 4-Mini-Flat | Active |
| HCPL-181-00DE | Broadcom Limited | 3750Vrms | 300% | 600% | 200mV | 50mA | -55°C ~ 100°C | 4-Mini-Flat | Active |
| HCPL-181-06BE | Broadcom Limited | 3750Vrms | 130% | 260% | 200mV | 50mA | -55°C ~ 100°C | 4-Mini-Flat | Active |
| HCPL-181-06DE | Broadcom Limited | 3750Vrms | 300% | 600% | 200mV | 50mA | -55°C ~ 100°C | 4-Mini-Flat | Active |
| LTV-356T | Lite-On Inc. | 3750Vrms | 50% | 600% | 200mV | 50mA | -55°C ~ 110°C | 4-SOP | Active |
| PC357N4J000F | SHARP/Socle Technology | 3750Vrms | 300% | 600% | 200mV | 50mA | -30°C ~ 100°C | 4-Mini-Flat | Active |
Engineering Selection Recommendations
All listed substitute parts maintain the mandatory 3750Vrms isolation voltage, single-channel transistor output configuration, and 80V maximum output voltage required for HMA121BV replacement. All substitute parts are classified as active products with current manufacturing support.
Broadcom HCPL-181 series parts (HCPL-181-000E, HCPL-181-00AE, HCPL-181-00BE, HCPL-181-00CE, HCPL-181-00DE, HCPL-181-06BE, HCPL-181-06DE) are available in multiple package options and Current Transfer Ratio grades. These parts carry ROHS3 compliance and REACH unaffected status.
EL357ND(TA)-G and LTV-356T provide extended operating temperature ranges (-55°C to 110°C) compared to the HMA121BV (-40°C to 100°C), suitable for applications requiring broader thermal performance.
PC357N4J000F offers ROHS3 compliance and maintains the 3750Vrms isolation specification with high Current Transfer Ratio performance (300-600% @ 5mA).
Output current capability differs between the HMA121BV (80mA) and most substitutes (50mA). Applications requiring the full 80mA output current must verify that substitute parts meet this requirement or redesign circuits for reduced current draw.
Frequently Asked Questions (FAQ)
Q: Can I directly replace HMA121BV with any of these substitute parts?
A: Direct replacement requires matching the mandatory parameters: 3750Vrms isolation voltage, single-channel transistor output, 80V maximum output voltage, and surface mount configuration. All listed parts meet these criteria. However, package form factor differences (4-SMD vs. 4-SOP vs. 4-SOIC vs. 4-Mini-Flat) require PCB layout verification. Output current capability (80mA for HMA121BV vs. 50mA for most substitutes) must be evaluated for your specific application.
Q: What is the difference between the various HCPL-181 part numbers?
A: HCPL-181 parts are differentiated by Current Transfer Ratio grades and package options. The suffix letters indicate CTR performance: -00AE (80-160%), -00BE (130-260%), -00CE (200-400%), -00DE (300-600%). The -06 variants (HCPL-181-06BE, HCPL-181-06DE) provide identical electrical performance to their -00 counterparts with different packaging or lead configurations. All maintain 3750Vrms isolation and 50mA output current.
Q: Are there temperature range considerations for substitution?
A: The HMA121BV operates from -40°C to 100°C. EL357ND(TA)-G and LTV-356T extend the upper temperature limit to 110°C and lower limit to -55°C, providing broader thermal margins. PC357N4J000F operates from -30°C to 100°C. Application thermal requirements determine whether extended range parts are necessary.
Q: What packaging options are available?
A: Substitute parts are available in four surface mount package types: 4-SMD (gull wing), 4-SOP, 4-SOIC, and 4-Mini-Flat. All are surface mount configurations. Package selection depends on PCB layout constraints and manufacturing equipment compatibility. Gull wing packages (4-SMD, 4-Mini-Flat) are standard for optoisolator applications.
Q: How do Current Transfer Ratio differences affect circuit design?
A: Current Transfer Ratio (CTR) determines the output current relative to input current. The HMA121BV specifies 50-150% CTR @ 5mA. Substitute parts offer wider CTR ranges (50-600% depending on grade). Higher CTR grades provide greater output current for the same input current, potentially improving circuit efficiency. Circuit designs must account for the specific CTR grade selected to ensure proper output current levels.
Q: Are all substitute parts RoHS compliant?
A: Broadcom HCPL-181 series, EL357ND(TA)-G, LTV-356T, and PC357N4J000F are all ROHS3 compliant. The HMA121BV is classified as obsolete and does not carry RoHS certification. Substitution with RoHS-compliant parts is required for applications subject to RoHS regulations.
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