1N5243C-TAP Equivalent & Substitute Parts

Part Overview

The 1N5243C-TAP is an active-status Zener diode rated at 13 V nominal with 500 mW power dissipation and ±2% tolerance. Manufactured by Vishay General Semiconductor - Diodes Division, this component is packaged in DO-204AH (DO-35) axial through-hole configuration and qualifies to AEC-Q101 automotive standards with ROHS3 compliance. Substitute parts are identified when equivalent electrical performance is required due to inventory constraints, manufacturing discontinuation, or design flexibility within specified parameter ranges.

Substiute Parts

1N5243C-TAP

Vishay General Semiconductor - Diodes DivisionIn Stock: 7221N5243C-TAP Datasheet

Current PartRFQ

1N5243B

Microchip TechnologyIn Stock: 31951N5243B Datasheet

MFR RecommendedRFQ

1N5243BTR

Fairchild SemiconductorIn Stock: 21541N5243BTR Datasheet

MFR RecommendedRFQ

2EZ13D5

Microchip TechnologyIn Stock: 22892EZ13D5 Datasheet

MFR RecommendedRFQ

BZX79-B13,113

Nexperia USA Inc.In Stock: 10123BZX79-B13,113 Datasheet

MFR RecommendedRFQ

BZX79-B13,133

NXP USA Inc.In Stock: 83501BZX79-B13,133 Datasheet

MFR RecommendedRFQ

BZX79-B13,143

NXP USA Inc.In Stock: 150915BZX79-B13,143 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1N5243C-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage: 13 V nominal
• Mounting type: Through Hole
• Package compatibility: DO-204AH (DO-35) or equivalent axial configuration

Secondary Compatibility Factors:

• Power dissipation rating (500 mW minimum for direct replacement; higher ratings acceptable)
• Tolerance specification (±2% preferred; ±5% acceptable with design review)
• Reverse leakage current (500 nA @ 9.9 V or lower)
• Forward voltage drop (1.1 V @ 200 mA or lower)
• Operating temperature range (minimum 175°C upper limit)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (500 mW, ±2% tolerance): BZX79-B13,113, BZX79-B13,133, and BZX79-B13,143 maintain the same power rating and tolerance specification as the main part, with enhanced operating temperature ranges and ROHS3 compliance.

Category B - Functional Equivalents (Alternative Power Ratings): 1N5243B and 1N5243BTR provide 500 mW power rating with relaxed tolerance (±5%) and extended temperature ranges. The 2EZ13D5 provides higher power dissipation (2 W) with different package geometry (DO-204AL / DO-41) for applications requiring increased thermal capacity.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The BZX79-B13,113, BZX79-B13,133, and BZX79-B13,143 series provide the closest electrical equivalence to the 1N5243C-TAP. All three maintain the ±2% tolerance specification, support extended operating temperature ranges to 200°C, and carry ROHS3 compliance status. BZX79-B13,143 offers the highest inventory availability (150,883 pcs) among substitute options. These parts are suitable for direct PCB substitution in DO-35 axial through-hole footprints.

For Applications with Relaxed Tolerance Requirements:

The 1N5243B (Microchip) and 1N5243BTR (Fairchild) maintain identical 500 mW power ratings and 13 V nominal voltage with ±5% tolerance. The 1N5243BTR extends the operating temperature range to 200°C and provides superior forward voltage characteristics (1.2 V @ 200 mA). Both are compatible with existing DO-35 footprints. Note that 1N5243B carries non-compliant RoHS status.

For Higher Power Dissipation Requirements:

The 2EZ13D5 (Microchip) provides 2 W power dissipation with 13 V nominal voltage and ±5% tolerance. This part requires a different through-hole footprint (DO-204AL / DO-41) and operates to 150°C maximum. Selection of this part is appropriate only when circuit design requires power handling beyond 500 mW.

Compliance Considerations:

The 1N5243C-TAP maintains AEC-Q101 automotive qualification and ROHS3 compliance. Among substitutes, only the BZX79-B13,113 explicitly carries ROHS3 compliance. Applications requiring automotive-grade components should prioritize BZX79-B13 series parts. Non-automotive applications may accept parts with relaxed compliance status based on design requirements.

Frequently Asked Questions (FAQ)

Q: Can the BZX79-B13,113 directly replace the 1N5243C-TAP in automotive applications?

A: The BZX79-B13,113 is electrically compatible and carries ROHS3 compliance. However, it is rated at 400 mW maximum power dissipation compared to the 1N5243C-TAP's 500 mW rating. Direct substitution is acceptable if circuit analysis confirms that power dissipation does not exceed 400 mW under worst-case operating conditions. The part maintains ±2% tolerance and supports the required 175°C operating temperature.

Q: What is the difference between the BZX79-B13,133 and BZX79-B13,143?

A: Both parts are electrically identical with 13 V nominal voltage, ±2% tolerance, 400 mW power rating, and -65°C to 200°C operating range. The primary difference is inventory availability: BZX79-B13,143 has 150,883 pcs in stock compared to 83,442 pcs for BZX79-B13,133. Both are manufactured by NXP USA Inc. and are suitable for direct substitution.

Q: Why does the 2EZ13D5 have lower impedance (5 Ω) than the main part (13 Ω)?

A: The 2EZ13D5 is rated for 2 W power dissipation compared to the 1N5243C-TAP's 500 mW. Higher power-rated Zener diodes typically exhibit lower dynamic impedance due to different semiconductor design and doping profiles. This characteristic affects voltage regulation performance under load changes. The 2EZ13D5 is suitable only for applications requiring higher power handling and where the impedance difference is acceptable to circuit design.

Q: Can I use the 1N5243B as a substitute if my design allows ±5% tolerance?

A: The 1N5243B provides 500 mW power rating and 13 V nominal voltage with ±5% tolerance, making it electrically compatible for applications with relaxed tolerance specifications. However, the 1N5243B carries non-compliant RoHS status. If RoHS compliance is required, the 1N5243BTR (Fairchild) is preferred, as it offers equivalent electrical performance with extended temperature range (-65°C to 200°C) and superior forward voltage characteristics (1.2 V @ 200 mA versus 1.5 V for the 1N5243B).

Q: Are all substitute parts compatible with the same PCB footprint as the 1N5243C-TAP?

A: All substitute parts except the 2EZ13D5 use the DO-204AH (DO-35) axial through-hole package and are compatible with the same PCB footprint. The 2EZ13D5 uses the DO-204AL (DO-41) package, which has different lead spacing and requires a different footprint. Verify PCB layout compatibility before selecting the 2EZ13D5.

Q: What is the significance of the reverse leakage current difference between the main part and BZX79 substitutes?

A: The 1N5243C-TAP specifies 500 nA reverse leakage at 9.9 V, while the BZX79-B13 series specifies 100 nA at 8 V. Lower reverse leakage current indicates reduced off-state current and improved voltage regulation stability. The BZX79-B13 series provides superior leakage performance, which is beneficial for precision voltage reference applications. This difference is not a barrier to substitution but represents an improvement in device characteristics.

Q: Which substitute part offers the best overall compatibility with the 1N5243C-TAP?

A: The BZX79-B13,143 provides the best overall compatibility: identical 13 V nominal voltage, ±2% tolerance matching the main part, ROHS3 compliance, extended operating temperature range (200°C), and highest inventory availability. The primary trade-off is reduced power rating (400 mW versus 500 mW), which is acceptable for most applications. The 1N5243BTR is the second choice if 500 mW power rating is mandatory and extended temperature range is required.