HMHA281R4 Optoisolator Equivalent & Substitute Parts

Part Overview

The HMHA281R4 is an optoisolator with transistor output manufactured by onsemi, designed for high-voltage isolation applications. This component provides 3750Vrms isolation with a single channel and transistor output configuration in a 4-Mini-Flat surface mount package. The part is currently in active production status with 829 pieces available in new original inventory. Substitute parts are identified based on matching electrical specifications and mechanical compatibility within the optoisolator category.

Substiute Parts

HMHA281R4

onsemiIn Stock: 880HMHA281R4 Datasheet

Current PartRFQ

HMHA281R2

onsemiIn Stock: 18196HMHA281R2 Datasheet

Parametric EquivalentRFQ

HMHA281R2V

onsemiIn Stock: 19194HMHA281R2V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HMHA281R4 are identified as parametric equivalents within the onsemi HMHA28 base product family. Substitution is valid when the following critical parameters match identically:

• Voltage - Isolation: 3750Vrms
• Number of Channels: 1
• Output Type: Transistor
• Current Transfer Ratio range: 50% (Min) to 600% (Max) @ 5mA
• Voltage - Output (Max): 80V
• Current - Output / Channel: 50mA
• Vce Saturation (Max): 400mV
• Operating Temperature range: -55°C ~ 100°C
• Package / Case: 4-SOIC (0.173", 4.40mm Width)
• Mounting Type: Surface Mount

The identified substitutes HMHA281R2 and HMHA281R2V meet all these criteria and are therefore electrically and mechanically interchangeable with the HMHA281R4.

Parameter Comparison

Engineering Selection Recommendations

All three parts—HMHA281R4, HMHA281R2, and HMHA281R2V—are active production components from onsemi with identical electrical and mechanical specifications. Selection between these parts may be based on packaging format and inventory availability:

• HMHA281R4: Supplied in standard packaging format with 829 pieces in stock
• HMHA281R2: Supplied in Tape & Reel (TR) format with 18,100 pieces in stock
• HMHA281R2V: Supplied in Tape & Reel (TR) format with 19,100 pieces in stock

All parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and are unaffected by REACH regulations. Component selection should be based on procurement requirements, assembly process compatibility with tape and reel formats, and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Are HMHA281R2 and HMHA281R2V direct substitutes for HMHA281R4?

A: Yes. All three parts share identical electrical specifications including isolation voltage (3750Vrms), current transfer ratio range (50% to 600% @ 5mA), output voltage (80V max), output current (50mA), and operating temperature range (-55°C to 100°C). They are housed in the same 4-SOIC package and are mechanically and electrically interchangeable.

Q: What is the difference between HMHA281R2 and HMHA281R2V?

A: Both parts have identical electrical and mechanical specifications. The difference lies in packaging format and inventory availability. HMHA281R2 has 18,100 pieces in stock, while HMHA281R2V has 19,100 pieces in stock. Both are supplied in Tape & Reel (TR) format.

Q: Can I use these parts interchangeably in my circuit design?

A: Yes, provided your application requires a single-channel optoisolator with 3750Vrms isolation, transistor output, 50mA output current capability, and operation within the -55°C to 100°C temperature range. All three parts meet these requirements identically.

Q: What packaging format should I select?

A: HMHA281R4 is supplied in standard packaging, while HMHA281R2 and HMHA281R2V are supplied in Tape & Reel (TR) format. Selection depends on your assembly process. Tape and reel format is typically preferred for automated pick-and-place assembly operations.

Q: Are all parts RoHS compliant?

A: Yes. HMHA281R4, HMHA281R2, and HMHA281R2V are all ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), making them suitable for standard manufacturing and storage conditions.