DB3TG DIAC Thyristor - Equivalent & Substitute Parts

Part Overview

The DB3TG is a DIAC (Diode for Alternating Current) thyristor device designed for AC switching and triggering applications. Manufactured by onsemi, this component operates at a breakover voltage of 30-34V with a peak output current of 2A in a DO-35 axial package. The onsemi DB3TG is currently classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications.

Substiute Parts

DB3TG

onsemiIn Stock: 2447DB3TG Datasheet

Current PartRFQ

DB3TG

STMicroelectronicsIn Stock: 2484DB3TG Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DB3TG is determined by strict equivalence across the following critical parameters:

• Voltage - Breakover: 30 ~ 34V (exact range match required)
• Current - Breakover: 15 µA (exact value match required)
• Current - Peak Output: 2 A (exact value match required)
• Operating Temperature Range: -40°C ~ 125°C (exact range match required)
• Package / Case: DO-35 axial configuration (mechanical compatibility required)
• Moisture Sensitivity Level: 1 (Unlimited)

The DB3TG manufactured by STMicroelectronics meets all substitution criteria as a direct equivalent part. Both versions share identical electrical specifications and package configuration, enabling direct replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The STMicroelectronics DB3TG is the direct functional equivalent to the obsolete onsemi DB3TG. Selection of the STMicroelectronics variant is supported by:

• Identical electrical specifications across all critical parameters
• Active product status ensuring ongoing availability and supply chain continuity
• ROHS3 compliance providing regulatory alignment for modern manufacturing environments
• Matching REACH and ECCN classifications confirming regulatory equivalence
• Identical package configuration enabling direct mechanical substitution

Frequently Asked Questions (FAQ)

Q: Can the STMicroelectronics DB3TG directly replace the onsemi DB3TG in existing circuits?

A: Yes. Both parts share identical breakover voltage (30-34V), breakover current (15 µA), peak output current (2A), operating temperature range (-40°C to 125°C), and DO-35 axial package configuration. Direct substitution is supported without circuit modification.

Q: What is the primary reason for seeking a substitute for the onsemi DB3TG?

A: The onsemi DB3TG is classified as obsolete. The STMicroelectronics DB3TG provides an active, continuously available alternative with identical specifications.

Q: Are there any compliance differences between the two parts?

A: The STMicroelectronics variant includes ROHS3 compliance certification. Both parts maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99).

Q: Does package configuration differ between manufacturers?

A: No. Both the onsemi and STMicroelectronics DB3TG use the DO-35 axial package (DO-204AH), ensuring mechanical compatibility in PCB layouts and through-hole applications.

Q: What parameters must match for valid substitution of DIAC thyristors?

A: Breakover voltage range, breakover current, peak output current, operating temperature range, and package type must all match exactly. The DB3TG variants meet all these criteria.