HMA2701 Equivalent & Substitute Parts

Part Overview

The HMA2701 is a 3750Vrms optoisolator with transistor output manufactured by onsemi in a 4-SMD surface mount package. This component provides galvanic isolation for single-channel DC input applications with 80mA output current capability. The HMA2701 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. Substitute parts must maintain the 3750Vrms isolation voltage, transistor output configuration, and surface mount form factor while meeting the electrical performance requirements of the original application.

Key Parameters

Parameter	Value
Manufacturer Part Number	HMA2701
Manufacturer	onsemi
Category	Optoisolators
Product Status	Obsolete
Number of Channels	1
Voltage - Isolation	3750Vrms
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	40V
Current - Output / Channel	80mA
Voltage - Forward (Vf) (Typ)	1.3V (Max)
Vce Saturation (Max)	300mV
Operating Temperature	-40°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing

Substitute Part Grouping Explanation

Substitute parts for the HMA2701 are classified based on their compatibility with the core electrical and mechanical requirements:

Direct Substitute (Functional Equivalent):

FODM2701 (onsemi) — Maintains identical electrical specifications with active product status and extended operating temperature range to 110°C

Upgrade Substitute (Enhanced Specifications):

PS2701-1-F3-A (Renesas Electronics Corporation) — Meets all core isolation and output requirements with extended temperature range (-55°C to 100°C) and lower forward voltage (1.1V typical)

Similar Substitutes (Compatible with Design Considerations):

HCPL-181-00BE (Broadcom Limited) — Maintains 3750Vrms isolation with higher maximum output voltage (80V) and lower saturation voltage (200mV), though output current is reduced to 50mA
LTV-357T (Lite-On Inc.) — Maintains 3750Vrms isolation with extended temperature range (-55°C to 110°C) and higher current transfer ratio maximum (600%), though output current is reduced to 50mA
LTV-357T-B (Lite-On Inc.) — Maintains 3750Vrms isolation with extended temperature range (-55°C to 110°C) and lower saturation voltage (200mV), though output current is reduced to 50mA
SFH690ABT (Vishay Semiconductor Opto Division) — Maintains 3750Vrms isolation and current transfer ratio range with higher maximum output voltage (70V) and lower saturation voltage (300mV), though output current is reduced to 50mA

Critical Substitution Parameters:

Voltage - Isolation: 3750Vrms (mandatory)
Output Type: Transistor (mandatory)
Input Type: DC (mandatory)
Number of Channels: 1 (mandatory)
Mounting Type: Surface Mount (mandatory)

Parameter Comparison

Parameter	HMA2701	FODM2701	PS2701-1-F3-A	HCPL-181-00BE	LTV-357T	LTV-357T-B	SFH690ABT
Manufacturer	onsemi	onsemi	Renesas Electronics	Broadcom Limited	Lite-On Inc.	Lite-On Inc.	Vishay Semiconductor
Product Status	Obsolete	Active	Not For New Designs	Active	Active	Active	Active
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	50% @ 5mA	130% @ 5mA	50% @ 5mA	130% @ 5mA	50% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA	300% @ 5mA	300% @ 5mA	260% @ 5mA	600% @ 5mA	260% @ 5mA	300% @ 5mA
Voltage - Output (Max)	40V	40V	40V	80V	35V	35V	70V
Current - Output / Channel	80mA	80mA	80mA	50mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.3V (Max)	1.4V (Max)	1.1V	1.2V	1.2V	1.2V	1.15V
Vce Saturation (Max)	300mV	300mV	300mV	200mV	200mV	200mV	300mV
Operating Temperature	-40°C ~ 100°C	-40°C ~ 110°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 110°C	-55°C ~ 110°C	-55°C ~ 100°C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Recommended Primary Choice): FODM2701 is the optimal substitute for the obsolete HMA2701. Both parts are manufactured by onsemi and maintain identical electrical specifications including 80mA output current, 40V maximum output voltage, and 300mV saturation voltage. FODM2701 carries active product status and ROHS3 compliance, with extended operating temperature range to 110°C. This part requires no circuit redesign and provides the highest compatibility assurance.

For Extended Temperature Range Applications: PS2701-1-F3-A (Renesas Electronics Corporation) provides extended lower temperature operation (-55°C minimum) while maintaining all core electrical parameters. This part is classified as "Not For New Designs" but remains available for existing production. LTV-357T and LTV-357T-B (Lite-On Inc.) offer the widest temperature range (-55°C to 110°C) with active product status and ROHS3 compliance.

For Applications with Reduced Output Current Requirements: HCPL-181-00BE, LTV-357T, LTV-357T-B, and SFH690ABT are suitable only when application design permits reduction of output current from 80mA to 50mA. These parts maintain 3750Vrms isolation and transistor output configuration. HCPL-181-00BE and LTV-357T-B offer reduced saturation voltage (200mV) compared to the original specification. All four parts carry active product status and ROHS3 compliance.

Compliance Considerations: All substitute parts maintain REACH Unaffected status and EAR99 ECCN classification consistent with the original HMA2701. FODM2701, PS2701-1-F3-A, HCPL-181-00BE, LTV-357T, LTV-357T-B, and SFH690ABT all carry ROHS3 compliance certification.

Frequently Asked Questions (FAQ)

Q: Can FODM2701 be used as a direct drop-in replacement for HMA2701? A: Yes. FODM2701 maintains identical electrical specifications and surface mount package configuration. The only differences are active product status and extended operating temperature range to 110°C, which provide improved long-term availability and broader environmental performance.

Q: What is the primary limitation when using LTV-357T, LTV-357T-B, HCPL-181-00BE, or SFH690ABT as substitutes? A: These parts reduce maximum output current from 80mA to 50mA. Applications requiring the full 80mA output current capability must use FODM2701 or PS2701-1-F3-A. Applications designed for 50mA or lower output current can use these alternatives without circuit modification.

Q: Are there package differences between substitute parts? A: All parts maintain 4-SMD surface mount configuration with gull wing leads. Package designations vary (4-SOP, 4-Mini-Flat) but are mechanically compatible with standard 4-SMD footprints. Verify PCB footprint compatibility with supplier documentation before production implementation.

Q: Which substitute part offers the best long-term availability? A: FODM2701 (onsemi) and LTV-357T-B (Lite-On Inc.) both carry active product status with high inventory levels (20,046 and 520,100 units respectively). These parts provide the strongest assurance of continued supply and production support.

Q: Can PS2701-1-F3-A be used for new designs despite "Not For New Designs" status? A: PS2701-1-F3-A is available for existing production support but is not recommended for new design implementations. FODM2701 or LTV-357T-B are preferred alternatives for new applications due to active product status.

Q: What are the isolation voltage requirements for substitution? A: All substitute parts must maintain 3750Vrms isolation voltage. This is a mandatory parameter for functional equivalence. No parts with lower isolation voltage ratings are acceptable substitutes.

Q: How do current transfer ratio variations affect circuit design? A: Current transfer ratio determines input-to-output current coupling efficiency. HMA2701 specifies 50% to 300% @ 5mA. LTV-357T extends the maximum to 600%, while HCPL-181-00BE and LTV-357T-B specify 130% to 260%. Circuit designs must account for these variations in input drive current calculations. Designs using the full 300% specification should be evaluated when substituting with parts having different CTR ranges.

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