HMAA2705R3 Optoisolator Equivalent & Substitute Parts

Part Overview

The HMAA2705R3 is a 3750Vrms isolation optoisolator with transistor output manufactured by onsemi in a 4-SMD surface mount package. This component provides galvanic isolation for AC and DC input signals with a single channel configuration and 80mA output current capability.

The HMAA2705R3 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this optoisolator topology.

Key Parameters

Parameter	Value
Manufacturer Part Number	HMAA2705R3
Manufacturer	onsemi
Category	Optoisolators
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
Vce Saturation (Max)	300mV
Operating Temperature	-40°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the HMAA2705R3 are qualified based on the following critical parameters that determine functional equivalence:

Mandatory Matching Parameters:

Voltage - Isolation: 3750Vrms (all substitutes maintain this specification)
Number of Channels: 1 (single channel configuration)
Output Type: Transistor (all substitutes use transistor output topology)
Input Type: AC, DC (all substitutes support both input types)
Mounting Type: Surface Mount (all substitutes are surface mount)

Allowable Parameter Variations:

Current Transfer Ratio: Minimum 50% @ 5mA acceptable; maximum up to 400% @ 1mA acceptable for substitution
Voltage - Output (Max): Range 35V to 70V acceptable (HMAA2705R3 specifies 40V)
Current - Output / Channel: Range 50mA to 80mA acceptable (HMAA2705R3 specifies 80mA)
Vce Saturation (Max): Range 200mV to 300mV acceptable
Operating Temperature: Extended ranges acceptable (HMAA2705R3 specifies -40°C ~ 100°C)
Package variants: 4-SMD, 4-SOP, 4-Mini-Flat acceptable within gull wing configuration family

Substitutes are categorized as upgrade (improved specifications or availability) or similar (equivalent specifications with different manufacturers).

Parameter Comparison

Parameter	HMAA2705R3	PS2705-1-F3-A	HCPL-354-000E	LTV-354T	PS2705-1-F4-L-A	TCMT1600
Manufacturer	onsemi	Renesas Electronics	Broadcom Limited	Lite-On Inc.	CEL	Vishay Semiconductor
Number of Channels	1	1	1	1	1	1
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Current Transfer Ratio (Min)	50% @ 5mA	50% @ 5mA	20% @ 1mA	20% @ 1mA	100% @ 5mA	80% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA	300% @ 5mA	400% @ 1mA	400% @ 1mA	300% @ 5mA	300% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	40V	40V	35V	35V	40V	70V
Current - Output / Channel	80mA	80mA	50mA	50mA	80mA	50mA
Vce Saturation (Max)	300mV	300mV	200mV	200mV	300mV	300mV
Operating Temperature	-40°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-30°C ~ 110°C	-55°C ~ 100°C	-40°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SOIC (0.173", 4.40mm Width)
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Upgrade Substitute - PS2705-1-F3-A (Renesas Electronics Corporation)

PS2705-1-F3-A provides direct parameter equivalence to HMAA2705R3 with identical current transfer ratio specifications (50% min, 300% max @ 5mA) and output characteristics (40V max, 80mA). This part is classified as "Not For New Designs" but maintains full electrical compatibility. ROHS3 compliance and extended operating temperature range (-55°C ~ 100°C) provide environmental advantages. Inventory availability is substantial (558,800 pcs).

Active Substitutes - HCPL-354-000E, LTV-354T, PS2705-1-F4-L-A, TCMT1600

All four parts maintain active product status and ROHS3 compliance. Selection depends on specific application requirements:

HCPL-354-000E (Broadcom Limited): Active status with 4-Mini-Flat package variant. Output current reduced to 50mA; maximum output voltage reduced to 35V. Suitable for applications not requiring full 80mA output capability.
LTV-354T (Lite-On Inc.): Active status with extended operating temperature range (-30°C ~ 110°C). Output current reduced to 50mA; maximum output voltage reduced to 35V. Suitable for high-temperature applications.
PS2705-1-F4-L-A (CEL): Active status with enhanced current transfer ratio minimum (100% @ 5mA). Maintains 40V output and 80mA current specifications. Tape & Reel packaging. Lowest inventory availability (730 pcs).
TCMT1600 (Vishay Semiconductor Opto Division): Active status with highest maximum output voltage (70V) and extended turn-on/turn-off time specifications (6µs, 5µs). Output current reduced to 50mA. Suitable for high-voltage applications.

For new designs, prioritize active status parts (HCPL-354-000E, LTV-354T, PS2705-1-F4-L-A, TCMT1600). For legacy system maintenance, PS2705-1-F3-A provides closest parameter match with adequate supply availability.

Frequently Asked Questions (FAQ)

Q: Can HCPL-354-000E replace HMAA2705R3 in all applications?

A: HCPL-354-000E maintains 3750Vrms isolation and transistor output topology but reduces maximum output current from 80mA to 50mA and maximum output voltage from 40V to 35V. Substitution is valid only if the application circuit operates within these reduced specifications. Verify output current and voltage requirements before substitution.

Q: What is the primary difference between PS2705-1-F3-A and PS2705-1-F4-L-A?

A: Both parts share identical isolation voltage, output voltage, and output current specifications. PS2705-1-F4-L-A specifies a higher minimum current transfer ratio (100% @ 5mA versus 50% @ 5mA), providing tighter performance tolerance. PS2705-1-F3-A offers greater inventory availability.

Q: Is TCMT1600 suitable as a direct replacement?

A: TCMT1600 maintains 3750Vrms isolation and transistor output but differs in three parameters: maximum output voltage increases to 70V, output current reduces to 50mA, and turn-on/turn-off times extend to 6µs/5µs. Substitution requires verification that the application can tolerate reduced output current and extended switching times.

Q: Why is HMAA2705R3 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Multiple active alternatives with equivalent or superior specifications are available from alternative manufacturers, eliminating the need for continued production of this specific part number.

Q: What packaging considerations apply to these substitutes?

A: HMAA2705R3, PS2705-1-F3-A, HCPL-354-000E, LTV-354T, and PS2705-1-F4-L-A all use 4-SMD gull wing surface mount packages compatible with standard PCB assembly processes. TCMT1600 uses 4-SOIC (0.173", 4.40mm width) package, which requires PCB footprint verification before substitution. Pin configuration must be confirmed for all package variants.

Q: Are all substitutes RoHS3 compliant?

A: Yes. PS2705-1-F3-A, HCPL-354-000E, LTV-354T, PS2705-1-F4-L-A, and TCMT1600 are all ROHS3 compliant. HMAA2705R3 RoHS status is not specified in available documentation.

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