HMAA2705R4 Optoisolator Transistor Output 3750Vrms Equivalent & Substitute Parts

Part Overview

The HMAA2705R4 is a 3750Vrms isolation optoisolator with transistor output manufactured by onsemi in a 4-SMD surface mount 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 rating.

Key Parameters

Parameter	Value
Manufacturer Part Number	HMAA2705R4
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
Vce Saturation (Max)	300mV
Operating Temperature	-40°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing
Input Type	AC, DC

Substitute Part Grouping Explanation

Substitution for the HMAA2705R4 is determined by the following critical parameters:

Voltage isolation rating of 3750Vrms
Single channel configuration
Transistor output type
AC and DC input capability
Surface mount 4-SMD package format
Maximum output voltage of 40V or greater
Output current capability of 80mA or greater
Current transfer ratio range compatible with 50-300% @ 5mA specification

Substitute parts are grouped into two categories based on electrical and mechanical compatibility:

Upgrade/Direct Substitutes maintain all critical electrical parameters and offer improved product status (active or not for new designs vs. obsolete):

PS2705-1-F3-A (Renesas Electronics Corporation)
PS2705-1-F4-L-A (CEL)

Similar/Compatible Substitutes maintain isolation voltage, channel count, and output type but may have variations in output voltage, current capacity, or current transfer ratio specifications:

HCPL-354-000E (Broadcom Limited)
LTV-354T (Lite-On Inc.)
TCMT1600 (Vishay Semiconductor Opto Division)

Parameter Comparison

Parameter	HMAA2705R4	PS2705-1-F3-A	PS2705-1-F4-L-A	HCPL-354-000E	LTV-354T	TCMT1600
Manufacturer	onsemi	Renesas Electronics	CEL	Broadcom Limited	Lite-On Inc.	Vishay Semiconductor
Product Status	Obsolete	Not For New Designs	Active	Active	Active	Active
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	100% @ 5mA	20% @ 1mA	20% @ 1mA	80% @ 5mA
Current Transfer Ratio (Max)	300% @ 5mA	300% @ 5mA	300% @ 5mA	400% @ 1mA	400% @ 1mA	300% @ 5mA
Output Type	Transistor	Transistor	Transistor	Transistor	Transistor	Transistor
Voltage - Output (Max)	40V	40V	40V	35V	35V	70V
Current - Output / Channel	80mA	80mA	80mA	50mA	50mA	50mA
Voltage - Forward (Vf) (Typ)	1.3V	1.1V	1.1V	1.2V	1.2V	1.35V
Vce Saturation (Max)	300mV	300mV	300mV	200mV	200mV	300mV
Operating Temperature	-40°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-30°C ~ 110°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)
Input Type	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC	AC, DC
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Preferred):

PS2705-1-F4-L-A is the primary recommendation. This part maintains identical electrical specifications to the HMAA2705R4 (40V output, 80mA current, 300mV Vce saturation) while offering active product status. It is manufactured by CEL under the NEPOC series and carries ROHS3 compliance certification. The extended operating temperature range (-55°C to 100°C) provides additional margin compared to the original part.

PS2705-1-F3-A is an alternative upgrade option from Renesas Electronics Corporation. It matches all critical electrical parameters and offers ROHS3 compliance, though it carries "Not For New Designs" status. This part is suitable for legacy system support and production continuity.

For Compatible Substitution:

HCPL-354-000E (Broadcom Limited) is an active product with ROHS3 compliance. This part reduces output current capability to 50mA and maximum output voltage to 35V, making it suitable only for applications not requiring the full 80mA output current of the original design. The lower Vce saturation (200mV) provides improved efficiency.

LTV-354T (Lite-On Inc.) is an active product with ROHS3 compliance and extended operating temperature range (-30°C to 110°C). Like the HCPL-354-000E, it is limited to 50mA output current and 35V maximum output voltage. This part is suitable for temperature-extended applications within the reduced current specification.

TCMT1600 (Vishay Semiconductor Opto Division) is an active product with ROHS3 compliance. This part offers the highest maximum output voltage (70V) but is limited to 50mA output current. The package format differs (4-SOIC vs. 4-SMD), requiring PCB layout modification. This part is suitable for high-voltage applications with reduced current requirements.

Frequently Asked Questions (FAQ)

Q: Can PS2705-1-F4-L-A directly replace HMAA2705R4 without circuit modification?

A: Yes. PS2705-1-F4-L-A maintains identical maximum output voltage (40V), output current (80mA), and Vce saturation (300mV) specifications. The 4-SMD gull wing package is mechanically compatible. No circuit redesign is required.

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

A: Both parts are electrically equivalent with identical isolation voltage, output ratings, and current transfer ratio specifications. PS2705-1-F4-L-A carries active product status, while PS2705-1-F3-A is marked "Not For New Designs." For new production, PS2705-1-F4-L-A is preferred.

Q: Why do HCPL-354-000E and LTV-354T have lower output current ratings?

A: These parts are designed with different output transistor specifications, limiting output current to 50mA versus the 80mA capability of HMAA2705R4. They are suitable only for applications requiring 50mA or less output current.

Q: Can TCMT1600 be used as a direct replacement?

A: TCMT1600 is electrically compatible but requires PCB layout modification due to package format change (4-SOIC vs. 4-SMD gull wing). The part is suitable for applications not requiring the full 80mA output current and where PCB redesign is acceptable.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. The original HMAA2705R4 does not specify RoHS status.

Q: What is the moisture sensitivity level for these parts?

A: All parts, including the original HMAA2705R4 and all substitutes, carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage and handling.

Q: Which substitute offers the widest operating temperature range?

A: LTV-354T provides the widest operating temperature range (-30°C to 110°C), followed by PS2705-1-F3-A and PS2705-1-F4-L-A (-55°C to 100°C). The original HMAA2705R4 operates from -40°C to 100°C.

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