TZX15C-TAP Equivalent & Substitute Parts

Part Overview

The TZX15C-TAP is a 15 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in the DO-35 (DO-204AH) axial through-hole package. This component is classified as an active product with AEC-Q101 automotive qualification and ROHS3 compliance. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and operational specifications are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	15	V
Power - Maximum	500	mW
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Operating Temperature Range	-65 to 175	°C
Category	Diodes, Zener	—

Substitute Part Grouping Explanation

Substitution of the TZX15C-TAP is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 15 V
Power - Maximum: 500 mW
Package / Case: DO-204AH, DO-35, Axial
Mounting Type: Through Hole

Secondary Compatibility Factors:

Operating Temperature Range: Minimum -65°C, Maximum ≥175°C
Product Status: Active
Category: Diodes, Zener

All identified substitute parts meet or exceed the primary electrical specifications and mechanical compatibility requirements. Variations in impedance, forward voltage, reverse leakage current, and tolerance are within acceptable ranges for this component category and do not preclude functional equivalence.

Parameter Comparison

Parameter	TZX15C-TAP (Vishay)	1N5245B (Microchip)	1N5245B TR PBFREE (Central Semi)	1N5245BTR (onsemi)	BZX79C15-T50A (Fairchild)	BZX79C15-T50R (Fairchild)
Voltage - Zener (Nom)	15 V	15 V	15 V	15 V	15 V	15 V
Tolerance	—	±5%	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	40 Ohms	16 Ohms	16 Ohms	16 Ohms	30 Ohms	30 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 11.5 V	100 nA @ 11 V	100 nA @ 11 V	100 nA @ 11 V	50 nA @ 10.5 V	50 nA @ 10.5 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	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	-65 to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
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	DO-204AH, DO-35, Axial
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	—	—

Engineering Selection Recommendations

Primary Selection (Preferred Substitutes):

The 1N5245B TR PBFREE (Central Semiconductor Corp) and 1N5245BTR (onsemi) are the preferred substitute options. Both parts maintain full electrical equivalence at the 15 V, 500 mW specification, feature ROHS3 compliance matching the original TZX15C-TAP, and support extended operating temperature ranges to 200°C. The 1N5245B TR PBFREE offers the highest inventory availability (19,774 pcs) and lead-free certification.

Secondary Selection (Compatible Alternatives):

The BZX79C15-T50R and BZX79C15-T50A (Fairchild Semiconductor) are functionally equivalent alternatives with 15 V, 500 mW specifications and DO-35 packaging. These parts provide lower reverse leakage current (50 nA) and extended temperature operation to 200°C. Inventory availability is substantial (35,677 and 45,200 pcs respectively).

Compliance Considerations:

The 1N5245B (Microchip Technology) is RoHS non-compliant and should be selected only when legacy design requirements or specific application constraints mandate this configuration. All other substitute options maintain ROHS3 compliance or equivalent environmental standards.

Automotive Applications:

The TZX15C-TAP carries AEC-Q101 automotive qualification. Substitute selection for automotive applications should prioritize parts with equivalent or superior qualification status and extended temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the 1N5245B (Microchip) be used as a direct replacement for the TZX15C-TAP?

A: The 1N5245B meets all primary electrical specifications (15 V, 500 mW) and mechanical compatibility requirements (DO-35 package, through-hole mounting). However, it is RoHS non-compliant, whereas the TZX15C-TAP is ROHS3 compliant. Selection depends on design compliance requirements.

Q: What is the difference between the two Fairchild BZX79C15 variants (T50A and T50R)?

A: Both BZX79C15-T50A and BZX79C15-T50R are electrically identical 15 V, 500 mW Zener diodes in DO-35 packaging. The designations reflect different packaging configurations (Bulk). Both are functionally equivalent for circuit applications.

Q: Does the extended temperature range of substitute parts (to 200°C) affect compatibility with the original design?

A: Extended temperature operation is a superset capability. Parts rated to -65 to 200°C are fully compatible with designs specified for -65 to 175°C operation. No design modification is required.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts are supplied in DO-35 (DO-204AH) axial through-hole packages, ensuring mechanical and pin compatibility. Packaging variants (Tape & Box, Cut Tape, Bulk) reflect distribution formats and do not affect electrical or mechanical performance.

Q: Which substitute offers the best availability?

A: The 1N5245B TR PBFREE (Central Semiconductor Corp) provides the highest inventory level at 19,774 pcs in stock, combined with ROHS3 compliance and extended temperature operation to 200°C.

Q: Can these Zener diodes be used interchangeably in automotive applications?

A: The TZX15C-TAP carries AEC-Q101 qualification. For automotive applications, verify that selected substitutes meet equivalent qualification requirements or obtain design approval documentation before implementation.

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