TZX16A-TAP Equivalent & Substitute Parts

Part Overview

The TZX16A-TAP is a 16 V, 500 mW Zener diode manufactured by Vishay General Semiconductor - Diodes Division in DO-35 through-hole packaging. This component is classified as Active product status and carries AEC-Q101 automotive qualification. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or design flexibility requirements within the allowed parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	16	V
Power - Maximum	500	mW
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature Range	-65°C to 175°C	°C
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—

Substitute Part Grouping Explanation

Substitution of the TZX16A-TAP is permissible when the following core parameters are maintained or exceeded:

Zener Voltage: 16 V nominal specification
Power Dissipation: 500 mW maximum rating
Package Type: DO-35 through-hole axial configuration
Mounting Method: Through-hole compatible
Compliance: ROHS3 compliant status
Environmental Rating: Operating temperature range of -65°C minimum to 175°C minimum

All substitute parts listed maintain these critical parameters. Variations in impedance, forward voltage, and reverse leakage current are within acceptable ranges for this component category and do not preclude substitution.

Parameter Comparison

Parameter	TZX16A-TAP (Vishay)	1N5246B TR PBFREE (Central Semiconductor)	1N5246BTR (Fairchild)	BZX79C16-T50A (onsemi)
Voltage - Zener (Nom)	16 V	16 V	16 V	16 V
Tolerance	—	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	45 Ohms	17 Ohms	17 Ohms	40 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 16 V	100 nA @ 12 V	100 nA @ 12 V	50 nA @ 11.2 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.1 V @ 200 mA	1.2 V @ 200 mA	1.5 V @ 100 mA
Operating Temperature	-65°C to 175°C	-65°C to 200°C	-65°C to 200°C	-65°C to 200°C
Mounting Type	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain active product status and are compatible with the TZX16A-TAP at the functional level. Selection among substitutes is determined by the following factors:

1N5246B TR PBFREE (Central Semiconductor Corp)

ROHS3 compliant with explicit lead-free designation
Operates to 200°C maximum temperature
Impedance of 17 Ohms provides lower dynamic resistance
Suitable for applications requiring extended temperature performance

1N5246BTR (Fairchild Semiconductor)

Highest inventory availability (60,815 pcs)
Operates to 200°C maximum temperature
Impedance of 17 Ohms provides lower dynamic resistance
Packaging available in bulk configuration

BZX79C16-T50A (onsemi)

ROHS3 compliant
Operates to 200°C maximum temperature
Impedance of 40 Ohms closely matches original specification
Forward voltage specification at 100 mA (versus 200 mA for other substitutes)

All substitute parts exceed the minimum operating temperature requirement of -65°C to 175°C established by the original component.

Frequently Asked Questions (FAQ)

Q: Can the 1N5246B TR PBFREE replace the TZX16A-TAP in automotive applications?

A: Yes. Both components meet ROHS3 compliance and automotive-grade requirements. The 1N5246B TR PBFREE operates to 200°C, exceeding the TZX16A-TAP specification of 175°C maximum. Zener voltage, power rating, and package type are identical.

Q: What is the difference between the three substitute parts?

A: All three maintain 16 V zener voltage and 500 mW power rating in DO-35 packaging. Primary differences are impedance values (17 Ohms for Central Semiconductor and Fairchild; 40 Ohms for onsemi), reverse leakage current specifications, and forward voltage measurements at different current levels. These variations do not affect functional substitution.

Q: Does the ±5% tolerance on substitute parts affect compatibility?

A: No. The ±5% tolerance specification on substitute parts (1N5246B TR PBFREE, 1N5246BTR, BZX79C16-T50A) represents a tighter specification than the original TZX16A-TAP, which carries no stated tolerance. This provides equal or improved performance.

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

A: Yes. All substitute parts are supplied in DO-35 through-hole axial configuration. The 1N5246BTR is additionally available in bulk packaging, while 1N5246B TR PBFREE and BZX79C16-T50A are supplied in cut tape.

Q: What is the operating temperature advantage of substitute parts?

A: The TZX16A-TAP operates from -65°C to 175°C. All three substitute parts extend the upper temperature limit to 200°C, providing 25°C additional thermal margin for high-temperature applications.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All parts share identical DO-35 axial through-hole package geometry and pin configuration, allowing direct mechanical and electrical substitution without PCB redesign.

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