HMHA2801AR4 Equivalent & Substitute Parts

Part Overview

The HMHA2801AR4 is an optoisolator with transistor output manufactured by onsemi, designed for high-voltage isolation applications requiring 3750Vrms isolation rating. This component features a single channel configuration in a 4-Mini-Flat surface mount package. The part is currently listed as obsolete, making identification of active equivalent alternatives essential for ongoing production and design continuity.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Category	Optoisolators
Number of Channels	1
Voltage - Isolation	3750Vrms
Current Transfer Ratio (Min)	80% @ 5mA
Current Transfer Ratio (Max)	160% @ 5mA
Output Type	Transistor
Voltage - Output (Max)	80V
Current - Output / Channel	50mA
Vce Saturation (Max)	300mV
Operating Temperature	-55°C ~ 100°C
Package / Case	4-SOIC (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the HMHA2801AR4 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Parameters for Substitution:

Voltage - Isolation: 3750Vrms (must match exactly)
Number of Channels: 1 (must match exactly)
Output Type: Transistor (must match exactly)
Current Transfer Ratio range: 80% - 160% @ 5mA (must match exactly)
Voltage - Output (Max): 80V (must match exactly)
Current - Output / Channel: 50mA (must match exactly)
Vce Saturation (Max): 300mV (must match exactly)
Operating Temperature: -55°C ~ 100°C (must match exactly)
Package / Case: 4-SOIC 4-Mini-Flat (must match exactly)

The HMHA2801AR4 has two active equivalent alternatives that maintain identical electrical specifications and mechanical compatibility. These substitutes differ only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel), which affects supply chain and handling but not functional performance.

Parameter Comparison

Parameter	HMHA2801AR4	HMHA2801AR2	HMHA2801AR2V
Manufacturer	onsemi	onsemi	onsemi
Product Status	Obsolete	Active	Active
Number of Channels	1	1	1
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms
Current Transfer Ratio (Min)	80% @ 5mA	80% @ 5mA	80% @ 5mA
Current Transfer Ratio (Max)	160% @ 5mA	160% @ 5mA	160% @ 5mA
Output Type	Transistor	Transistor	Transistor
Voltage - Output (Max)	80V	80V	80V
Current - Output / Channel	50mA	50mA	50mA
Vce Saturation (Max)	300mV	300mV	300mV
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
Package / Case	4-SOIC (0.173", 4.40mm Width)	4-SOIC (0.173", 4.40mm Width)	4-SOIC (0.173", 4.40mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Bulk	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

HMHA2801AR2 is the primary substitute for the obsolete HMHA2801AR4. This part maintains complete electrical and mechanical compatibility while offering active product status and ROHS3 compliance. The Tape & Reel packaging format is suitable for automated assembly processes and high-volume production environments.

HMHA2801AR2V serves as an alternative substitute with identical electrical specifications and ROHS3 compliance. The Cut Tape & Digi-Reel packaging format accommodates lower-volume requirements and manual assembly workflows while maintaining full functional equivalence.

Both substitute parts are manufactured by onsemi under the same base product number (HMHA2801) and share identical isolation voltage, current transfer ratio, output characteristics, and thermal operating range. Selection between HMHA2801AR2 and HMHA2801AR2V depends on procurement volume and assembly methodology rather than electrical performance.

Frequently Asked Questions (FAQ)

Q: Can HMHA2801AR2 directly replace HMHA2801AR4 in existing designs?

A: Yes. The HMHA2801AR2 maintains identical electrical specifications, isolation voltage, current transfer ratio, output voltage and current ratings, saturation characteristics, and operating temperature range. The 4-SOIC package dimensions and pin configuration are unchanged, enabling direct substitution without circuit modification.

Q: What is the difference between HMHA2801AR2 and HMHA2801AR2V?

A: Both parts are electrically and mechanically identical. The difference lies in packaging format: HMHA2801AR2 is supplied in Tape & Reel format for automated assembly, while HMHA2801AR2V is supplied in Cut Tape & Digi-Reel format for manual or lower-volume assembly. Functional performance is equivalent.

Q: Why is HMHA2801AR4 listed as obsolete?

A: The HMHA2801AR4 has been discontinued by onsemi. The active alternatives HMHA2801AR2 and HMHA2801AR2V provide identical functionality and are the recommended replacements for new designs and production continuity.

Q: Are there any compliance differences between the obsolete and substitute parts?

A: The substitute parts HMHA2801AR2 and HMHA2801AR2V carry ROHS3 compliance certification, while the obsolete HMHA2801AR4 does not specify this status. Both substitute parts maintain REACH Unaffected status and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental specifications.

Q: What packaging considerations apply when switching from HMHA2801AR4 to substitutes?

A: The HMHA2801AR4 was supplied in bulk packaging. HMHA2801AR2 uses Tape & Reel format, standard for automated pick-and-place assembly. HMHA2801AR2V uses Cut Tape & Digi-Reel format, suitable for manual assembly or lower-volume applications. Both formats maintain the same 4-SOIC package dimensions and pin spacing, requiring no PCB layout modifications.

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