Request Quote
(Ships tomorrow)
HMA121V Optoisolator Equivalent & Substitute Parts
Part Overview
The HMA121V is a 3750Vrms isolation optoisolator with transistor output manufactured by onsemi in a 4-SMD package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The HMA121V provides single-channel DC input isolation with 80V maximum output voltage and 80mA output current capability, suitable for applications requiring high-voltage galvanic isolation in compact surface-mount form factors.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Isolation Voltage | 3750Vrms |
| Number of Channels | 1 |
| Output Type | Transistor |
| Input Type | DC |
| Voltage - Output (Max) | 80V |
| Current - Output / Channel | 80mA |
| Current Transfer Ratio (Min) | 50% @ 5mA |
| Current Transfer Ratio (Max) | 600% @ 5mA |
| 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 HMA121V is determined by strict equivalence across the following critical 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)
- Mounting Type: Surface Mount (all substitutes match)
- Moisture Sensitivity Level: 1 (Unlimited) (all substitutes match)
Substitute parts are grouped by package type and current transfer ratio specifications. The HMA121V operates with a 50–600% current transfer ratio range. Substitutes maintain this isolation voltage and output characteristics while offering variations in package form factors (4-SMD, 4-SOP, 4-SOIC, 4-Mini-Flat) and current transfer ratio grades. All substitutes are active products with RoHS3 compliance, providing improved product lifecycle support compared to the obsolete HMA121V.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Isolation Voltage | CTR Min @ 5mA | CTR Max @ 5mA | Vce Sat (Max) | Output Current | Package Type | Operating Temp |
|---|---|---|---|---|---|---|---|---|---|
| HMA121V | onsemi | Obsolete | 3750Vrms | 50% | 600% | 400mV | 80mA | 4-SMD | -40°C ~ 100°C |
| FODM121V | onsemi | Active | 3750Vrms | 50% | 600% | 400mV | 80mA | 4-SMD | -40°C ~ 110°C |
| EL357ND(TA)-G | Everlight Electronics | Active | 3750Vrms | 300% | 600% | 200mV | 50mA | 4-SOP | -55°C ~ 110°C |
| HCPL-181-000E | Broadcom Limited | Active | 3750Vrms | 50% | 600% | 200mV | 50mA | 4-SOIC | -55°C ~ 100°C |
| HCPL-181-00AE | Broadcom Limited | Active | 3750Vrms | 80% | 160% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C |
| HCPL-181-00BE | Broadcom Limited | Active | 3750Vrms | 130% | 260% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C |
| HCPL-181-00CE | Broadcom Limited | Active | 3750Vrms | 200% | 400% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C |
| HCPL-181-00DE | Broadcom Limited | Active | 3750Vrms | 300% | 600% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C |
| HCPL-181-06BE | Broadcom Limited | Active | 3750Vrms | 130% | 260% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C |
| HCPL-181-06DE | Broadcom Limited | Active | 3750Vrms | 300% | 600% | 200mV | 50mA | 4-Mini-Flat | -55°C ~ 100°C |
| LTV-356T | Lite-On Inc. | Active | 3750Vrms | 50% | 600% | 200mV | 50mA | 4-SOP | -55°C ~ 110°C |
Engineering Selection Recommendations
Direct Replacement (Same Package, Same Performance): FODM121V is the primary direct replacement for HMA121V. Both are onsemi products in 4-SMD Gull Wing packages with identical electrical specifications (50–600% CTR, 400mV Vce saturation, 80mA output current). FODM121V is active with extended operating temperature range (-40°C to 110°C) and RoHS3 compliance, providing superior lifecycle support.
Package-Variant Substitutes (Electrical Equivalence, Different Form Factor): Broadcom HCPL-181 series (000E, 00AE, 00BE, 00CE, 00DE, 06BE, 06DE) and Lite-On LTV-356T maintain 3750Vrms isolation and transistor output but use alternative package types (4-SOIC, 4-Mini-Flat, 4-SOP). These parts are active with RoHS3 compliance. Selection depends on PCB layout constraints and current transfer ratio requirements. HCPL-181-00DE and HCPL-181-06DE match the HMA121V's 50–600% CTR range. Output current is reduced to 50mA in these variants, which must be verified against application requirements.
Alternative Manufacturer Options: Everlight EL357ND(TA)-G provides 3750Vrms isolation in 4-SOP package with 300–600% CTR range and improved Vce saturation (200mV). This part is active with RoHS3 compliance and extended temperature range (-55°C to 110°C). Output current is 50mA.
All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity rating and REACH compliance status equivalent to the original HMA121V.
Frequently Asked Questions (FAQ)
Q: Can FODM121V directly replace HMA121V without PCB modification? A: Yes. FODM121V is electrically and mechanically identical to HMA121V, both using 4-SMD Gull Wing packages with matching pin configurations. No PCB layout changes are required.
Q: What is the difference between HCPL-181-00DE and HCPL-181-06DE? A: Both parts are electrically identical (3750Vrms isolation, 300–600% CTR, 200mV Vce saturation, 50mA output current, 4-Mini-Flat package). The suffix designations reflect internal manufacturing or date code variations. Selection between them is interchangeable for the specified electrical parameters.
Q: Why do some substitutes have lower output current (50mA vs. 80mA)? A: Package form factor constraints determine maximum output current ratings. 4-SOIC, 4-SOP, and 4-Mini-Flat packages are physically smaller than 4-SMD and have reduced thermal dissipation capability, limiting output current to 50mA. Applications requiring 80mA output must use FODM121V or verify that 50mA is sufficient.
Q: Are all substitute parts RoHS3 compliant? A: Yes. All active substitute parts listed (FODM121V, EL357ND(TA)-G, HCPL-181 series, LTV-356T) carry RoHS3 compliance certification. The obsolete HMA121V does not have RoHS3 status.
Q: What is the significance of current transfer ratio (CTR) grades? A: CTR determines the ratio of output current to input current. HMA121V operates at 50–600% CTR. Broadcom HCPL-181-00AE is limited to 80–160% CTR, making it unsuitable for applications requiring higher CTR performance. HCPL-181-00DE and HCPL-181-06DE match the full 50–600% range.
Q: Can I use LTV-356T in place of HMA121V? A: LTV-356T is electrically compatible (3750Vrms, 50–600% CTR, 200mV Vce saturation) but uses 4-SOP package instead of 4-SMD. PCB layout modification is required. Output current is 50mA instead of 80mA. Verify application current requirements before substitution.
Q: What is the operating temperature difference between HMA121V and substitutes? A: HMA121V operates -40°C to 100°C. FODM121V extends to -40°C to 110°C. Broadcom HCPL-181 series and Everlight EL357ND(TA)-G operate -55°C to 100°C or -55°C to 110°C, providing wider temperature margins. Lite-On LTV-356T operates -55°C to 110°C. Select based on application thermal requirements.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts