HMAA2705R2 Optoisolator Transistor Output 3750Vrms Equivalent & Substitute Parts

Part Overview

The HMAA2705R2 is a 3750Vrms isolation 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 ongoing design support and production continuity. The part provides single-channel isolation suitable for AC and DC input applications with 80mA output current capability and 40V maximum output voltage.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Number of Channels	1
Current Transfer Ratio (Min)	50% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA
Voltage - Output (Max)	40V
Current - Output / Channel	80mA
Vce Saturation (Max)	300mV
Operating Temperature	-40°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Input Type	AC, DC
Output Type	Transistor

Substitute Part Grouping Explanation

Substitution for the HMAA2705R2 is determined by strict equivalence across the following critical parameters:

Voltage isolation rating: 3750Vrms (mandatory match)
Number of channels: 1 (mandatory match)
Output type: Transistor (mandatory match)
Input type: AC, DC (mandatory match)
Mounting type: Surface Mount (mandatory match)
Package category: 4-SMD, Gull Wing (primary requirement)
Voltage - Output (Max): 40V or greater
Current - Output / Channel: 80mA or greater
Vce Saturation (Max): 300mV or less
Operating temperature range: Must encompass -40°C to 100°C minimum

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Specifications): Parts meeting all electrical and mechanical parameters with minimal variation.

Compatible Alternatives (Functional Equivalents): Parts meeting core isolation, channel, and output specifications with acceptable parameter variations within design margins.

Parameter Comparison

Part Number	Manufacturer	Voltage - Isolation	Channels	CTR Min @ 5mA	CTR Max @ 5mA	Vout (Max)	Iout / Channel	Vce Sat (Max)	Temp Range	Package	Status
HMAA2705R2	onsemi	3750Vrms	1	50%	300%	40V	80mA	300mV	-40°C ~ 100°C	4-SMD, Gull Wing	Obsolete
FODM2705R2	onsemi	3750Vrms	1	50%	300%	40V	80mA	300mV	-40°C ~ 110°C	4-SMD, Gull Wing	Active
PS2705-1-F3-A	Renesas Electronics Corporation	3750Vrms	1	50%	300%	40V	80mA	300mV	-55°C ~ 100°C	4-SMD, Gull Wing	Not For New Designs
PS2705-1-F4-L-A	CEL	3750Vrms	1	100%	300%	40V	80mA	300mV	-55°C ~ 100°C	4-SMD, Gull Wing	Active
HCPL-354-000E	Broadcom Limited	3750Vrms	1	20% @ 1mA	400% @ 1mA	35V	50mA	200mV	-55°C ~ 100°C	4-SMD, Gull Wing	Active
LTV-354T	Lite-On Inc.	3750Vrms	1	20% @ 1mA	400% @ 1mA	35V	50mA	200mV	-30°C ~ 110°C	4-SMD, Gull Wing	Active
TCMT1600	Vishay Semiconductor Opto Division	3750Vrms	1	80% @ 5mA	300% @ 5mA	70V	50mA	300mV	-40°C ~ 100°C	4-SOIC (0.173", 4.40mm Width)	Active

Engineering Selection Recommendations

Primary Recommendation: FODM2705R2

FODM2705R2 is the direct functional equivalent manufactured by onsemi. It maintains identical electrical specifications to HMAA2705R2 while offering active product status. The extended operating temperature range (-40°C ~ 110°C) provides additional thermal margin. RoHS3 compliance and REACH unaffected status align with modern supply chain requirements. This part is available in high volume (110,200 pcs in stock) and is the preferred replacement for direct substitution.

Secondary Recommendation: PS2705-1-F4-L-A

PS2705-1-F4-L-A manufactured by CEL provides equivalent electrical performance with improved current transfer ratio minimum (100% @ 5mA vs. 50% @ 5mA). Extended temperature range (-55°C ~ 100°C) and active product status support long-term availability. RoHS3 compliance and REACH unaffected status are confirmed. Limited inventory (730 pcs) may impact procurement for high-volume applications.

Alternative Options: HCPL-354-000E and LTV-354T

HCPL-354-000E (Broadcom) and LTV-354T (Lite-On) maintain 3750Vrms isolation and single-channel transistor output with active product status. Both parts feature improved Vce saturation (200mV vs. 300mV) and extended temperature ranges. However, reduced maximum output voltage (35V vs. 40V) and output current (50mA vs. 80mA) limit applicability to designs with lower power requirements. These parts are suitable only when output specifications can be reduced.

Not Recommended for New Designs: PS2705-1-F3-A

PS2705-1-F3-A carries "Not For New Designs" status despite equivalent electrical specifications. This designation indicates manufacturer intent to discontinue the product line. Use only for legacy system maintenance where supply chain continuity is already established.

Package Consideration: TCMT1600

TCMT1600 (Vishay) offers superior output voltage capability (70V) and equivalent current transfer ratio performance. However, the 4-SOIC package differs from the 4-SMD gull wing standard, requiring PCB layout redesign and potential assembly process changes. This part is suitable only when package migration is feasible and output voltage enhancement is required.

Frequently Asked Questions (FAQ)

Q: Can HCPL-354-000E or LTV-354T be used as direct replacements for HMAA2705R2?

A: These parts maintain 3750Vrms isolation and single-channel transistor output but have reduced maximum output voltage (35V vs. 40V) and output current (50mA vs. 80mA). They are compatible only if your circuit design operates within these lower specifications. Verify output voltage and current requirements before selection.

Q: What is the difference between FODM2705R2 and HMAA2705R2?

A: FODM2705R2 is electrically equivalent with identical current transfer ratio and output specifications. The primary differences are product status (Active vs. Obsolete) and extended operating temperature range (-40°C ~ 110°C vs. -40°C ~ 100°C). FODM2705R2 is the recommended replacement.

Q: Does PS2705-1-F4-L-A offer advantages over FODM2705R2?

A: PS2705-1-F4-L-A provides higher minimum current transfer ratio (100% @ 5mA vs. 50% @ 5mA) and extended lower temperature limit (-55°C vs. -40°C). Both parts maintain 40V output voltage and 80mA output current. Selection depends on whether the improved CTR minimum and extended temperature range are required for your application.

Q: Why is TCMT1600 listed if the package is different?

A: TCMT1600 meets all electrical isolation and output type requirements but uses a 4-SOIC package instead of 4-SMD gull wing. It is included as a functional alternative only for designs where package migration is acceptable and the higher output voltage (70V) provides design benefits.

Q: Are all substitute parts RoHS3 compliant?

A: FODM2705R2, PS2705-1-F3-A, PS2705-1-F4-L-A, HCPL-354-000E, LTV-354T, and TCMT1600 are all RoHS3 compliant. HMAA2705R2 (obsolete) does not carry RoHS3 designation. All listed parts are REACH unaffected.

Q: What is the minimum current transfer ratio requirement for my design?

A: The HMAA2705R2 specifies 50% minimum CTR @ 5mA. FODM2705R2 maintains this specification. PS2705-1-F4-L-A offers 100% minimum CTR @ 5mA. HCPL-354-000E and LTV-354T specify 20% minimum CTR @ 1mA (different test condition). Verify your circuit design requirements before selecting a part with different CTR specifications.

Q: Can I use HCPL-354-000E in a 40V application?

A: No. HCPL-354-000E has a maximum output voltage of 35V, which is insufficient for 40V applications. Use FODM2705R2, PS2705-1-F3-A, PS2705-1-F4-L-A, or TCMT1600 for 40V or higher output voltage requirements.

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