HMA124V Equivalent & Substitute Parts

Part Overview

The HMA124V is a 3750Vrms optoisolator with transistor output manufactured by onsemi in a 4-SMD 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 part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain the core isolation voltage, output type, and electrical performance parameters while accommodating different package formats and manufacturer specifications.

Key Parameters

Parameter	HMA124V Specification
Voltage - Isolation	3750Vrms
Number of Channels	1
Output Type	Transistor
Input Type	DC
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 HMA124V is determined by the following mandatory parameters:

Isolation Voltage: All substitutes must maintain 3750Vrms isolation rating
Output Type: Transistor output configuration required
Number of Channels: Single channel only
Input Type: DC input only
Output Voltage Rating: Maximum 80V
Mounting Type: Surface mount only
Moisture Sensitivity: MSL 1 (Unlimited) preferred for compatibility

Substitute parts are grouped by package format (4-SOP, 4-SOIC, 4-Mini-Flat) and current transfer ratio specifications. Package differences do not affect electrical substitution but require PCB layout modifications. Current transfer ratio variations (50% to 600% @ 5mA) represent different gain grades within the same functional family and are selectable based on circuit requirements.

Parameter Comparison

Parameter	HMA124V	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
Voltage - Isolation	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
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
Current Transfer Ratio (Min)	100% @ 1mA	300% @ 5mA	50% @ 5mA	80% @ 5mA	130% @ 5mA	200% @ 5mA	300% @ 5mA	130% @ 5mA	300% @ 5mA	50% @ 5mA	300% @ 5mA
Current Transfer Ratio (Max)	1200% @ 1mA	600% @ 5mA	600% @ 5mA	160% @ 5mA	260% @ 5mA	400% @ 5mA	600% @ 5mA	260% @ 5mA	600% @ 5mA	600% @ 5mA	600% @ 5mA
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
Vce Saturation (Max)	400mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV	200mV
Voltage - Forward (Vf) (Typ)	1.3V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V	1.2V
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 Width)	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 (MSL)	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 active products with current manufacturing support, addressing the obsolescence status of the HMA124V. Selection among substitutes depends on package compatibility with existing PCB designs and current transfer ratio requirements for the application circuit.

Package Format Considerations:

4-Mini-Flat packages (HCPL-181 series, PC357N4J000F) represent the most common footprint among active alternatives and offer the widest availability. The HCPL-181 series provides multiple current transfer ratio grades (00AE through 06DE) enabling precise gain selection.

4-SOP packages (EL357ND(TA)-G, LTV-356T) accommodate applications requiring larger pitch spacing. These parts maintain identical electrical specifications to Mini-Flat equivalents while providing different mechanical interfaces.

4-SOIC package (HCPL-181-000E) offers a wider body format (5.30mm) suitable for applications with relaxed PCB density constraints.

Current Transfer Ratio Selection:

The HMA124V specifies 100% minimum at 1mA input current. Substitute parts specify current transfer ratios at 5mA input, representing a different measurement condition. HCPL-181-00CE (200-400% @ 5mA) and HCPL-181-00DE (300-600% @ 5mA) provide the closest functional equivalence for general-purpose applications. HCPL-181-00AE (80-160% @ 5mA) suits applications requiring lower gain.

Compliance and Certifications:

All substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. The HMA124V carries REACH Unaffected designation only. All parts share identical ECCN (EAR99) and HTSUS (8541.49.8000) classifications.

Output Current Derating:

The HMA124V specifies 80mA maximum output current per channel. All substitute parts specify 50mA maximum output current. Circuit designs must accommodate this 37.5% reduction in output current capability or employ external buffering stages.

Frequently Asked Questions (FAQ)

Q: Can I directly replace HMA124V with any of these substitute parts on my PCB?

A: Direct replacement depends on package format. If your PCB is designed for 4-SMD Gull Wing footprint, you must use parts with identical package specifications. 4-Mini-Flat packages (HCPL-181 series, PC357N4J000F) require PCB redesign. 4-SOP and 4-SOIC packages require different footprints entirely. Electrical substitution is valid across all listed parts; mechanical substitution requires footprint compatibility.

Q: What is the difference between HCPL-181-00AE, HCPL-181-00BE, HCPL-181-00CE, and HCPL-181-00DE?

A: These parts are identical except for current transfer ratio specifications. The suffix letter indicates the gain grade: 00AE (80-160%), 00BE (130-260%), 00CE (200-400%), 00DE (300-600%). Selection depends on your circuit's input current and required output switching speed. Higher gain grades (00DE) provide faster response with lower input current requirements.

Q: Why do substitute parts specify 50mA output current while HMA124V specifies 80mA?

A: This represents a fundamental difference in device design between the obsolete HMA124V and current-generation alternatives. All active substitute parts are rated for 50mA maximum output current. Circuit designs must be verified to operate within this lower limit or employ external output buffering.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry ROHS3 Compliant status. The HMA124V carries REACH Unaffected designation. For applications requiring RoHS compliance, any of the listed substitutes meets current regulatory requirements.

Q: What is the difference between HCPL-181-06BE and HCPL-181-00BE?

A: Both parts share identical electrical specifications (130-260% current transfer ratio @ 5mA). The "06" designation indicates a different manufacturing variant or date code series. Functionally, these parts are equivalent for circuit design purposes.

Q: Can I use EL357ND(TA)-G or LTV-356T if my PCB footprint is designed for 4-Mini-Flat?

A: No. EL357ND(TA)-G uses 4-SOP (2.54mm) package and LTV-356T uses 4-SOP package. These are mechanically incompatible with 4-Mini-Flat footprints. PCB redesign is required for these packages.

Q: Which substitute part has the best availability?

A: PC357N4J000F shows the highest inventory (163,625 pcs) followed by HCPL-181-00BE (103,100 pcs). Both parts use 4-Mini-Flat packages and provide 300-600% current transfer ratio specifications suitable for general-purpose applications.

Q: Do all substitute parts operate across the same temperature range as HMA124V?

A: No. HMA124V operates -40°C to 100°C. Most substitutes operate -55°C to 100°C (wider low-temperature range). EL357ND(TA)-G and LTV-356T extend to 110°C maximum. PC357N4J000F operates -30°C to 100°C (narrower low-temperature range). Verify temperature specifications match your application requirements.

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