TZX13A-TAP Equivalent & Substitute Parts

Part Overview

The TZX13A-TAP is a 13 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-35 (DO-204AH) through-hole package. This component is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	13	V
Power - Maximum	500	mW
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Operating Temperature Range	-65 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TZX13A-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 13 V nominal
Maximum power dissipation: 500 mW
Package type: DO-35 (DO-204AH) through-hole axial configuration
Operating temperature range: minimum -65°C to 175°C

Secondary Compatibility Factors:

Voltage tolerance (±5% acceptable for most applications)
Impedance characteristics (Zzt)
Reverse leakage current specifications
Forward voltage drop (Vf) at specified current
RoHS and REACH compliance status

All substitute parts listed maintain the core electrical specifications (13 V, 500 mW) and identical package geometry, ensuring direct mechanical and electrical interchangeability within the specified parameter ranges.

Parameter Comparison

Parameter	TZX13A-TAP (Vishay)	1N5243B (Microchip)	1N5243B TR PBFREE (Central Semi)	1N5243BTR (Fairchild)	BZX79C13-T50A (onsemi)
Voltage - Zener (Nom)	13 V	13 V	13 V	13 V	13 V
Tolerance	—	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max) (Zzt)	35 Ohms	13 Ohms	13 Ohms	13 Ohms	30 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 10 V	500 nA @ 9.9 V	500 nA @ 9.9 V	500 nA @ 9.9 V	100 nA @ 8 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 100 mA
Operating Temperature	-65 to 175°C	-65 to 175°C (TJ)	-65 to 200°C	-65 to 200°C	-65 to 200°C
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Full Compliance Match):

The 1N5243B TR PBFREE (Central Semiconductor Corp) and BZX79C13-T50A (onsemi) are the preferred substitute options. Both parts maintain ROHS3 compliance matching the original TZX13A-TAP specification and support extended operating temperature ranges (-65°C to 200°C). These parts are suitable for applications requiring regulatory compliance and automotive-grade reliability.

Secondary Substitutes (Functional Equivalence):

The 1N5243B (Microchip Technology) and 1N5243BTR (Fairchild Semiconductor) provide functional electrical equivalence with identical 13 V, 500 mW specifications and DO-35 package compatibility. The 1N5243B carries RoHS non-compliance status, which may restrict use in regulated applications. The 1N5243BTR RoHS status is not specified in the provided data.

Compliance Considerations:

Applications requiring AEC-Q101 automotive qualification should reference the original TZX13A-TAP specification. Substitute parts listed do not explicitly state AEC-Q101 qualification in the provided parameters. For automotive applications, compliance verification with the selected substitute manufacturer is required.

Frequently Asked Questions (FAQ)

Q: Can the 1N5243B TR PBFREE directly replace the TZX13A-TAP?

A: Yes. Both parts share identical nominal zener voltage (13 V), maximum power rating (500 mW), and DO-35 through-hole package configuration. The 1N5243B TR PBFREE provides ROHS3 compliance and extended temperature range (-65°C to 200°C), making it a direct mechanical and electrical substitute.

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

A: The primary difference is RoHS compliance status. The 1N5243B TR PBFREE is ROHS3 compliant with lead-free construction, while the standard 1N5243B is RoHS non-compliant. Both maintain identical electrical specifications (13 V, 500 mW, ±5% tolerance).

Q: Why do impedance (Zzt) values differ among substitute parts?

A: Impedance variation (13 to 35 Ohms) reflects manufacturing differences between suppliers while maintaining the same nominal zener voltage and power rating. All listed values fall within acceptable ranges for 13 V, 500 mW zener diodes and do not affect basic substitution compatibility.

Q: Is the BZX79C13-T50A suitable for applications requiring the original TZX13A-TAP?

A: Yes. The BZX79C13-T50A matches the 13 V nominal voltage and 500 mW power specification with DO-35 package compatibility. It provides ROHS3 compliance and extended operating temperature range (-65°C to 200°C). Reverse leakage current is lower (100 nA @ 8 V) compared to the original part.

Q: What packaging formats are available for these substitute parts?

A: All substitute parts are supplied in DO-35 (DO-204AH) through-hole axial packages. Packaging options vary by supplier: 1N5243B TR PBFREE is available in Cut Tape (CT), 1N5243BTR in Bulk, and BZX79C13-T50A in Cut Tape (CT). The original TZX13A-TAP is supplied in Tape & Box (TB) format.

Q: Are these substitutes suitable for automotive applications?

A: The original TZX13A-TAP carries AEC-Q101 automotive qualification. Substitute parts do not explicitly state AEC-Q101 qualification in the provided specifications. For automotive applications requiring AEC-Q101 certification, manufacturer verification is necessary before substitution.

Q: What is the temperature operating range difference between parts?

A: The TZX13A-TAP operates from -65°C to 175°C. Substitute parts 1N5243B TR PBFREE, 1N5243BTR, and BZX79C13-T50A extend the upper limit to 200°C. The 1N5243B (Microchip) maintains the same -65°C to 175°C range as the original part.

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