1N4744A Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4744A is a 15 V Zener diode rated for 1.3 W maximum power dissipation in a DO-41 axial through-hole package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is qualified to AEC-Q101 automotive standards and complies with ROHS3 regulations.

The 1N4744A is classified as obsolete product status. Identification of active equivalent parts ensures design continuity, maintains supply chain reliability, and supports long-term production requirements for applications utilizing this Zener diode specification.

Substiute Parts

1N4744A-T

Vishay General Semiconductor - Diodes DivisionIn Stock: 52301N4744A-T Datasheet

Current PartRFQ

1N4744A-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 197201N4744A-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N4744A is determined by electrical and mechanical parameter equivalence within the Zener diode category. The following parameters establish substitution validity:

Critical Electrical Parameters:

• Zener voltage (Nominal): 15 V
• Tolerance: ±5%
• Maximum power dissipation: 1.3 W
• Reverse leakage current: 5 µA @ 11.4 V
• Forward voltage: 1.2 V @ 200 mA
• Operating temperature: 175°C

Critical Mechanical Parameters:

• Package type: DO-204AL / DO-41 axial through-hole
• Mounting configuration: Through-hole

Compliance Requirements:

• Automotive grade qualification (AEC-Q101)
• ROHS3 compliance
• Moisture sensitivity level: 1 (Unlimited)

Substitute parts must match all critical electrical parameters within specified tolerances and maintain identical mechanical packaging and through-hole mounting configuration. Compliance certifications must be equivalent or superior to the main part specification.

Parameter Comparison

Engineering Selection Recommendations

The 1N4744A-TR serves as the direct active substitute for the obsolete 1N4744A-T. Both components are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications across all critical parameters: 15 V nominal Zener voltage, ±5% tolerance, 1.3 W maximum power, and 175°C operating temperature.

Both parts maintain AEC-Q101 automotive qualification and ROHS3 compliance. The mechanical packaging is identical: DO-204AL / DO-41 axial through-hole configuration. The 1N4744A-TR demonstrates superior impedance performance (14 Ohms versus 700 Ohms), which represents an improvement in dynamic response characteristics while maintaining full electrical compatibility.

The 1N4744A-TR is classified as active product status with significantly higher inventory availability (19,686 pieces in stock versus 5,200 pieces for the obsolete main part). This substitution is appropriate for new designs, production continuity, and component replenishment in existing applications.

Frequently Asked Questions (FAQ)

Q: Can the 1N4744A-TR directly replace the 1N4744A-T in existing circuit designs?

A: Yes. Both components share identical electrical specifications (15 V Zener voltage, ±5% tolerance, 1.3 W power rating) and mechanical packaging (DO-41 axial through-hole). No circuit modifications are required.

Q: What is the significance of the impedance difference between these parts?

A: The 1N4744A-TR exhibits lower impedance (14 Ohms) compared to the 1N4744A-T (700 Ohms). Lower impedance indicates superior dynamic response and regulation characteristics. This represents an improvement in performance while maintaining full backward compatibility.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the 1N4744A-T and 1N4744A-TR carry AEC-Q101 automotive qualification and are rated for automotive-grade applications.

Q: What is the difference between the -T and -TR packaging designations?

A: The 1N4744A-T is supplied in standard packaging, while the 1N4744A-TR is supplied in cut tape (CT) packaging. Both use the identical DO-41 axial through-hole package. The packaging designation reflects the delivery format rather than the component itself.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both components are ROHS3 compliant, carry identical moisture sensitivity level (MSL 1 - Unlimited), and share the same ECCN and HTSUS classifications.

Q: Why is the 1N4744A-T classified as obsolete?

A: The 1N4744A-T is obsolete due to product lifecycle management by the manufacturer. The 1N4744A-TR remains in active production and serves as the current equivalent for this specification.