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HMA124R3 Equivalent & Substitute Parts
Part Overview
The HMA124R3 is an optoisolator with transistor output manufactured by onsemi, rated for 3750Vrms isolation voltage with single-channel configuration in 4-SMD packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part delivers 80mA output current with 100–1200% current transfer ratio at 1mA input, suitable for DC input applications requiring galvanic isolation in compact surface-mount form factors.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Isolation Voltage | 3750Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Current Transfer Ratio (Min) | 100% @ 1mA |
| Current Transfer Ratio (Max) | 1200% @ 1mA |
| Output Voltage (Max) | 80V |
| Output Current / Channel | 80mA |
| Vce Saturation (Max) | 400mV |
| Operating Temperature Range | -40°C to 100°C |
| Mounting Type | Surface Mount |
| Package / Case | 4-SMD, Gull Wing |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the HMA124R3 is determined by strict alignment of the following electrical and mechanical parameters:
- Isolation Voltage: All substitutes must maintain 3750Vrms isolation rating
- Number of Channels: Single-channel configuration required
- Output Type: Transistor output mandatory
- Output Voltage & Current: Maximum 80V output with minimum 50mA output current per channel
- Vce Saturation: Maximum 400mV acceptable for direct replacement; lower values indicate improved performance
- Operating Temperature: Minimum range -40°C to 100°C; extended ranges acceptable
- Mounting Type: Surface mount required
- Input Type: DC input required
- Product Status: Active status preferred for long-term availability
Substitutes are grouped by package type (4-SMD, 4-SOP, 4-SOIC, 4-Mini-Flat) and current transfer ratio specifications. Parts with higher current transfer ratios or lower Vce saturation values represent performance improvements while maintaining functional compatibility.
Parameter Comparison
| Part Number | Manufacturer | Isolation Voltage | CTR Min @ Condition | CTR Max @ Condition | Output Voltage (Max) | Output Current | Vce Sat (Max) | Temp Range | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| HMA124R3 | onsemi | 3750Vrms | 100% @ 1mA | 1200% @ 1mA | 80V | 80mA | 400mV | -40°C to 100°C | 4-SMD | Obsolete |
| FODM124R2 | onsemi | 3750Vrms | 100% @ 1mA | 1200% @ 1mA | 80V | 80mA | 400mV | -40°C to 110°C | 4-SMD | Active |
| EL357ND(TA)-G | Everlight Electronics | 3750Vrms | 300% @ 5mA | 600% @ 5mA | 80V | 50mA | 200mV | -55°C to 110°C | 4-SOP | Active |
| HCPL-181-000E | Broadcom Limited | 3750Vrms | 50% @ 5mA | 600% @ 5mA | 80V | 50mA | 200mV | -55°C to 100°C | 4-SOIC | Active |
| HCPL-181-00AE | Broadcom Limited | 3750Vrms | 80% @ 5mA | 160% @ 5mA | 80V | 50mA | 200mV | -55°C to 100°C | 4-Mini-Flat | Active |
| HCPL-181-00BE | Broadcom Limited | 3750Vrms | 130% @ 5mA | 260% @ 5mA | 80V | 50mA | 200mV | -55°C to 100°C | 4-Mini-Flat | Active |
| HCPL-181-00CE | Broadcom Limited | 3750Vrms | 200% @ 5mA | 400% @ 5mA | 80V | 50mA | 200mV | -55°C to 100°C | 4-Mini-Flat | Active |
| HCPL-181-00DE | Broadcom Limited | 3750Vrms | 300% @ 5mA | 600% @ 5mA | 80V | 50mA | 200mV | -55°C to 100°C | 4-Mini-Flat | Active |
| HCPL-181-06BE | Broadcom Limited | 3750Vrms | 130% @ 5mA | 260% @ 5mA | 80V | 50mA | 200mV | -55°C to 100°C | 4-Mini-Flat | Active |
| HCPL-181-06DE | Broadcom Limited | 3750Vrms | 300% @ 5mA | 600% @ 5mA | 80V | 50mA | 200mV | -55°C to 100°C | 4-Mini-Flat | Active |
| LTV-356T | Lite-On Inc. | 3750Vrms | 50% @ 5mA | 600% @ 5mA | 80V | 50mA | 200mV | -55°C to 110°C | 4-SOP | Active |
Engineering Selection Recommendations
Primary Substitute (Same Package, Same Manufacturer): FODM124R2 from onsemi is the direct functional equivalent with identical electrical specifications and 4-SMD packaging. It maintains the same current transfer ratio range (100–1200% @ 1mA) and output current (80mA), with extended operating temperature range to 110°C. Active product status ensures long-term availability and supply chain continuity.
Alternative Substitutes (Different Packages, Active Status): All Broadcom HCPL-181 variants (HCPL-181-000E, HCPL-181-00AE, HCPL-181-00BE, HCPL-181-00CE, HCPL-181-00DE, HCPL-181-06BE, HCPL-181-06DE) meet isolation voltage and output specifications with improved Vce saturation (200mV vs. 400mV). These parts are available in 4-SOIC and 4-Mini-Flat packages. Selection among HCPL-181 variants depends on required current transfer ratio: HCPL-181-00AE (80–160%), HCPL-181-00BE/06BE (130–260%), HCPL-181-00CE (200–400%), HCPL-181-00DE/06DE (300–600%).
Everlight EL357ND(TA)-G and Lite-On LTV-356T provide 3750Vrms isolation in 4-SOP package with 50mA output current and 200mV Vce saturation. Both support extended temperature ranges (-55°C to 110°C).
All substitutes carry RoHS3 compliance and REACH unaffected status, matching the original part's regulatory profile.
Frequently Asked Questions (FAQ)
Q: Can FODM124R2 directly replace HMA124R3 in existing designs? A: Yes. FODM124R2 maintains identical electrical specifications (3750Vrms isolation, 100–1200% CTR @ 1mA, 80mA output current, 400mV Vce saturation) and 4-SMD package footprint. The extended temperature range (-40°C to 110°C vs. -40°C to 100°C) provides additional operational margin.
Q: What is the difference between HCPL-181 variants? A: HCPL-181 variants differ in current transfer ratio specifications at 5mA input: HCPL-181-00AE (80–160%), HCPL-181-00BE/06BE (130–260%), HCPL-181-00CE (200–400%), HCPL-181-00DE/06DE (300–600%). All share 3750Vrms isolation, 80V output voltage, 50mA output current, and 200mV Vce saturation. Selection depends on circuit requirements for input current and gain margin.
Q: Are package changes acceptable? A: Package changes from 4-SMD to 4-SOIC, 4-SOP, or 4-Mini-Flat require PCB layout modification. All substitute packages maintain surface-mount configuration and gull-wing lead geometry. Verify footprint compatibility and thermal management requirements before design implementation.
Q: Do all substitutes meet compliance requirements? A: All listed substitutes carry RoHS3 compliance and REACH unaffected status, matching HMA124R3 regulatory profile. Verify specific certifications (ECCN, HTSUS codes) for your application and region.
Q: What is the impact of lower Vce saturation in substitute parts? A: Lower Vce saturation (200mV in HCPL-181 and Everlight/Lite-On parts vs. 400mV in HMA124R3) reduces output voltage drop and power dissipation in the transistor output stage, improving efficiency and thermal performance. This represents a performance improvement for direct substitution.
Q: Which substitute offers the best inventory availability? A: HCPL-181-00BE from Broadcom has the highest inventory (103,100 pcs), followed by HCPL-181-000E (47,300 pcs) and HCPL-181-00DE (44,400 pcs). FODM124R2 from onsemi provides 35,200 pcs in active status.
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