HT5762 Equivalent & Substitute Parts

Part Overview

The HT5762 is a DIAC thyristor manufactured by Littelfuse Inc., rated for 32–40V breakover voltage with 2A peak output current in a DO-35 axial package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The HT5762 operates across the industrial temperature range of –40°C to 125°C and complies with ROHS3 standards.

Substiute Parts

HT5762

Littelfuse Inc.In Stock: 928HT5762 Datasheet

Current PartRFQ

DB3

Fairchild SemiconductorIn Stock: 770983DB3 Datasheet

MFR RecommendedRFQ

DB3TG

STMicroelectronicsIn Stock: 2484DB3TG Datasheet

MFR RecommendedRFQ

DB4

STMicroelectronicsIn Stock: 20892DB4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HT5762 is determined by the following critical parameters:

• Voltage – Breakover Range: The substitute must operate within or overlap the 32–40V specification
• Current – Peak Output: Must support minimum 2A peak output
• Package / Case: Must be DO-35 axial configuration for mechanical and electrical compatibility
• Operating Temperature: Must maintain –40°C to 125°C range
• RoHS Compliance: Must meet ROHS3 standards for regulatory alignment

Three substitute parts meet these criteria with varying voltage specifications:

• DB3 (Fairchild Semiconductor): 28–36V breakover, overlaps lower end of HT5762 range
• DB3TG (STMicroelectronics): 30–34V breakover, closest voltage alignment to HT5762
• DB4 (STMicroelectronics): 35–45V breakover, overlaps upper end of HT5762 range

Parameter Comparison

Engineering Selection Recommendations

DB3TG (STMicroelectronics) provides the closest electrical match to HT5762, with identical breakover current (15 µA) and voltage range (30–34V) that falls within the HT5762 specification window. DB3TG carries active product status, ensuring long-term availability and supply chain stability. This part is the primary substitute for direct replacement applications.

DB4 (STMicroelectronics) is suitable for applications requiring higher voltage tolerance, with breakover range of 35–45V. This part overlaps the upper portion of the HT5762 specification and maintains active status. Selection of DB4 is appropriate when circuit design permits operation at the higher voltage threshold.

DB3 (Fairchild Semiconductor) covers the lower voltage range (28–36V) with 50 µA breakover current. Although obsolete, this part remains available in inventory. DB3 is applicable only when circuit requirements specifically accommodate the lower voltage specification and higher breakover current.

All three substitutes maintain DO-35 axial packaging, ROHS3 compliance, and 2A peak output current, ensuring mechanical and regulatory compatibility with the original HT5762 design.

Frequently Asked Questions (FAQ)

Q: Can DB3TG directly replace HT5762 in existing designs?

A: Yes. DB3TG matches the HT5762 in breakover current (15 µA), operating temperature range (–40°C to 125°C), peak output current (2 A), and DO-35 axial package. The voltage range (30–34V) is contained within the HT5762 specification (32–40V), making it electrically compatible for direct substitution.

Q: What is the difference between DB3 and DB3TG?

A: DB3 (Fairchild) has a breakover voltage of 28–36V and breakover current of 50 µA. DB3TG (STMicroelectronics) has a breakover voltage of 30–34V and breakover current of 15 µA. DB3TG more closely matches the HT5762 specification and carries active product status, while DB3 is obsolete.

Q: When should DB4 be selected instead of DB3TG?

A: DB4 should be selected when circuit design permits operation at higher breakover voltages (35–45V). DB4 is appropriate for applications where the upper voltage threshold of the HT5762 range is not a limiting factor. Both DB4 and DB3TG maintain active product status.

Q: Are all substitutes available in the same packaging?

A: Yes. HT5762, DB3, DB3TG, and DB4 are all supplied in DO-35 axial package configuration, ensuring mechanical compatibility and direct pin-for-pin substitution.

Q: Do all substitutes meet RoHS compliance requirements?

A: Yes. All four parts (HT5762, DB3, DB3TG, and DB4) are ROHS3 compliant, meeting regulatory requirements for new designs and production environments.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active status indicates ongoing manufacturer support and supply availability. DB3TG and DB4 carry active status, ensuring long-term sourcing reliability. DB3 and HT5762 are obsolete, meaning no new production is available, though existing inventory may remain in stock.