HT5761ARP Equivalent & Substitute Parts

Part Overview

The HT5761ARP is a Diac/Sidac thyristor manufactured by Littelfuse Inc., rated for 30–34V breakover voltage with 2A peak output current in a DO-35 axial package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The HT5761ARP operates across the industrial temperature range of –40°C to 125°C and complies with RoHS3 standards.

Substiute Parts

HT5761ARP

Littelfuse Inc.In Stock: 856HT5761ARP 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 for the HT5761ARP is determined by the following critical electrical and mechanical parameters:

• Voltage – Breakover Range: The substitute must operate within or encompass the 30–34V specification
• Current – Peak Output: Must support minimum 2A peak output
• Package / Case: Must be DO-35 axial configuration for mechanical compatibility
• Operating Temperature Range: Must support –40°C to 125°C
• RoHS Compliance: Must meet RoHS3 standards for regulatory alignment

Based on these criteria, the HT5761ARP has three identified substitutes: DB3, DB3TG, and DB4. The DB3TG and DB4 are active products, while DB3 is obsolete. The DB3TG provides the closest electrical match with identical voltage and current specifications. The DB4 operates at a higher voltage range (35–45V) and serves applications requiring elevated breakover voltage within the same package format.

Parameter Comparison

Engineering Selection Recommendations

DB3TG (STMicroelectronics) is the primary substitute for the HT5761ARP. It matches the exact voltage breakover range (30–34V), breakover current (15 µA), and peak output current (2A). DB3TG is an active product with current manufacturing status, ensuring long-term availability and supply chain stability. It carries RoHS3 compliance and REACH Unaffected status, meeting regulatory requirements for new designs.

DB4 (STMicroelectronics) serves as an alternative for applications requiring higher breakover voltage (35–45V). While the voltage range exceeds the HT5761ARP specification, the DB4 maintains identical peak output current (2A) and package compatibility. This substitute is suitable only when circuit design permits operation at elevated breakover thresholds.

DB3 (Fairchild Semiconductor) is electrically compatible with a breakover range of 28–36V that encompasses the HT5761ARP specification. However, DB3 is classified as obsolete, limiting its suitability for new procurement. The higher breakover current (50 µA versus 15 µA) may affect circuit timing characteristics in sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can DB3TG directly replace HT5761ARP in existing designs? A: Yes. DB3TG matches the HT5761ARP in voltage breakover (30–34V), breakover current (15 µA), peak output current (2A), and DO-35 package format. No circuit modifications are required.

Q: What is the difference between DB3 and DB3TG? A: Both are Diac thyristors in DO-35 packages with 2A peak output. DB3TG is manufactured by STMicroelectronics and is currently active, while DB3 (Fairchild) is obsolete. DB3TG has identical electrical specifications to HT5761ARP, whereas DB3 has a wider voltage range (28–36V) and higher breakover current (50 µA).

Q: When should DB4 be used instead of DB3TG? A: DB4 is specified only when the application circuit requires a higher breakover voltage threshold (35–45V range). If the design operates within the 30–34V range, DB3TG is the appropriate choice.

Q: Are all substitutes RoHS3 compliant? A: Yes. HT5761ARP, DB3, DB3TG, and DB4 are all RoHS3 compliant, meeting environmental and regulatory standards for electronic components.

Q: What is the operating temperature range for these substitutes? A: All listed parts operate across –40°C to 125°C junction temperature, matching the HT5761ARP specification for industrial applications.

Q: Does package format differ among these substitutes? A: No. All substitutes use the DO-204AH / DO-35 axial package format, ensuring mechanical and pin compatibility with the HT5761ARP.