HT5762RP DIAC Thyristor Equivalent & Substitute Parts

Part Overview

The HT5762RP is a DIAC (Diode for Alternating Current) 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 HT5762RP operates across the industrial temperature range of -40°C to 125°C and complies with ROHS3 standards.

Substiute Parts

HT5762RP

Littelfuse Inc.In Stock: 988HT5762RP 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 HT5762RP is determined by strict alignment of electrical and mechanical parameters:

Critical Substitution Parameters:

• Package / Case: DO-204AH, DO-35, Axial (must match)
• Current - Peak Output: 2 A (must match)
• Operating Temperature: -40°C ~ 125°C (must match)
• Voltage - Breakover: Range must overlap or encompass the original 32–40V specification

Substitute Classification:

Group 1 – Lower Voltage Range (DB3 / DB3TG): Breakover voltage 28–36V overlaps with the lower end of the HT5762RP specification. These parts maintain identical package, current rating, and temperature range.

Group 2 – Higher Voltage Range (DB4): Breakover voltage 35–45V overlaps with the upper end of the HT5762RP specification. This part maintains identical package, current rating, and temperature range.

All substitute parts are available in active or current production status, ensuring supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

For voltage-critical applications within 32–40V: DB3TG (STMicroelectronics) provides the closest electrical match with breakover voltage of 30–34V and identical 15 µA breakover current. Active product status ensures long-term availability.

For applications tolerating lower breakover voltage (28–36V range): DB3 (Fairchild Semiconductor) is functionally equivalent but carries obsolete status. Use only if existing inventory is available and supply continuity is not a concern.

For applications tolerating higher breakover voltage (35–45V range): DB4 (STMicroelectronics) extends the upper voltage range and maintains active production status. This part is suitable when circuit design permits operation at higher breakover thresholds.

All substitute parts maintain ROHS3 compliance, identical package geometry, and equivalent thermal performance, ensuring direct mechanical and electrical interchangeability within their respective voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can DB3 directly replace HT5762RP? A: DB3 shares identical package, current rating, and temperature range. However, its 28–36V breakover voltage range does not fully encompass the original 32–40V specification. Use only if circuit design tolerates the lower voltage threshold.

Q: Is DB3TG a direct substitute for HT5762RP? A: DB3TG is the closest substitute. It maintains the same 15 µA breakover current, 2A peak output, DO-35 package, and -40°C to 125°C operating range. The 30–34V breakover voltage overlaps the lower portion of the HT5762RP range. Active product status provides supply continuity.

Q: When should DB4 be selected instead of DB3TG? A: DB4 is appropriate when circuit design permits operation at higher breakover voltages (35–45V). Both DB4 and DB3TG are active products; selection depends on the specific voltage requirement of the application.

Q: Are all substitutes available in the same package? A: Yes. All substitute parts (DB3, DB3TG, DB4) are supplied in DO-204AH, DO-35 axial package, ensuring identical PCB footprint and mechanical compatibility.

Q: Do substitute parts meet the same compliance standards? A: Yes. All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original HT5762RP specifications.

Q: What is the difference between DB3 and DB3TG? A: Both are DIAC thyristors with overlapping voltage ranges. DB3 (Fairchild) is obsolete; DB3TG (STMicroelectronics) is active production. DB3TG is preferred for new designs due to supply availability.