1N5243B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5243B is a 13 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-204AH (DO-35) axial through-hole package. This component is classified as obsolete, indicating discontinued production by the original manufacturer. Identification of equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this Zener diode specification.

Substiute Parts

1N5243B-T

Vishay General Semiconductor - Diodes DivisionIn Stock: 7961N5243B-T Datasheet

Current PartRFQ

1N5243B-TR

Vishay General Semiconductor - Diodes DivisionIn Stock: 334611N5243B-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5243B is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Zener voltage: 13 V nominal
• Tolerance: ±5%
• Maximum power dissipation: 500 mW
• Reverse leakage current: 500 nA @ 9.9 V
• Forward voltage: 1.1 V @ 200 mA
• Operating temperature: 175°C maximum

Mechanical & Package Specifications:

• Package type: DO-204AH (DO-35) axial through-hole
• Mounting configuration: Through-hole PCB assembly

Compliance & Regulatory:

• RoHS3 compliance
• Automotive grade classification
• AEC-Q101 qualification

The 1N5243B-TR is a direct electrical and mechanical equivalent, differing only in packaging format (Cut Tape versus bulk) and product status (Active versus Obsolete). The impedance specification variance (600 Ohms versus 13 Ohms) reflects measurement condition differences and does not affect functional substitution capability.

Parameter Comparison

Engineering Selection Recommendations

The 1N5243B-TR is a direct functional substitute for the 1N5243B. Selection of the 1N5243B-TR is supported by the following factors:

Product Status: The 1N5243B-TR maintains Active product status with Vishay General Semiconductor - Diodes Division, ensuring ongoing availability and manufacturer support. The original 1N5243B is classified as Obsolete, making the 1N5243B-TR the appropriate alternative for new designs and ongoing production requirements.

Electrical Equivalence: All critical electrical parameters are identical, including Zener voltage, tolerance, power rating, reverse leakage current, and forward voltage characteristics. The component operates within the same temperature range (175°C maximum).

Compliance & Certification: Both parts maintain ROHS3 compliance, automotive-grade classification, and AEC-Q101 qualification. These certifications ensure suitability for automotive and regulated applications.

Package Compatibility: Both parts utilize the DO-204AH (DO-35) axial through-hole package, ensuring mechanical and PCB assembly compatibility without design modification.

Packaging Format Consideration: The 1N5243B-TR is supplied in Cut Tape (CT) format, which is standard for active production components. This format is compatible with automated assembly processes and does not affect electrical performance or board-level functionality.

Frequently Asked Questions (FAQ)

Q: Can the 1N5243B-TR be used as a direct replacement for the 1N5243B in existing designs?

A: Yes. The 1N5243B-TR is electrically and mechanically equivalent to the 1N5243B. All critical electrical parameters, including Zener voltage (13 V), power rating (500 mW), tolerance (±5%), and operating temperature (175°C), are identical. The DO-204AH (DO-35) axial through-hole package is the same, requiring no PCB design changes.

Q: What is the difference between the 1N5243B and 1N5243B-TR?

A: The primary differences are product status and packaging format. The 1N5243B is classified as Obsolete, while the 1N5243B-TR is Active. The 1N5243B-TR is supplied in Cut Tape (CT) format, which is standard for active production components. Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications.

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

A: No. Both the 1N5243B and 1N5243B-TR maintain ROHS3 compliance, automotive-grade classification, and AEC-Q101 qualification. There are no compliance or certification differences between the two parts.

Q: Does the Cut Tape packaging format of the 1N5243B-TR affect performance or assembly?

A: No. Cut Tape (CT) is a standard packaging format for through-hole components and is compatible with both manual and automated assembly processes. The electrical performance and board-level functionality are identical to bulk-packaged components. The packaging format affects only supply chain logistics and assembly handling, not component performance.

Q: What parameters must match for a Zener diode to be considered a substitute?

A: For the 1N5243B, the following parameters must match: Zener voltage (13 V nominal), tolerance (±5%), maximum power dissipation (500 mW), reverse leakage current (500 nA @ 9.9 V), forward voltage (1.1 V @ 200 mA), operating temperature (175°C), and package type (DO-204AH / DO-35 axial through-hole). Compliance certifications (ROHS3, AEC-Q101, automotive grade) must also be maintained.

Q: Is the 1N5243B-TR suitable for automotive applications?

A: Yes. The 1N5243B-TR maintains automotive-grade classification and AEC-Q101 qualification, identical to the original 1N5243B. It is suitable for automotive applications requiring a 13 V, 500 mW Zener diode in the DO-35 package.