TZX15X-TAP Equivalent & Substitute Parts

Part Overview

The TZX15X-TAP is a 15 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 an active product with AEC-Q101 automotive qualification and ROHS3 compliance. Zener diodes of this specification are used in voltage regulation, overvoltage protection, and reference voltage applications across automotive and industrial electronics. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters to ensure functional interchangeability in circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Power - Max	500	mW
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Operating Temperature Range	-65°C to 175°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TZX15X-TAP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 15 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 (DO-204AH) through-hole axial configuration
Mounting method: Through-hole

Secondary Compatibility Factors:

Operating temperature range (minimum -65°C, maximum ≥175°C)
RoHS3 compliance status
Regulatory compliance (REACH Unaffected, EAR99 classification)

All substitute parts listed meet or exceed the primary matching criteria. Variations in impedance (Zzt), reverse leakage current, forward voltage, and tolerance specifications are within acceptable ranges for functional equivalence in standard voltage regulation and protection applications.

Parameter Comparison

Parameter	TZX15X-TAP (Main)	1N5245B TR PBFREE	1N5245BTR	BZX79C15-T50A	BZX79C15-T50R
Manufacturer	Vishay General Semiconductor	Central Semiconductor Corp	onsemi	Fairchild Semiconductor	Fairchild Semiconductor
Voltage - Zener (Nom)	15 V	15 V	15 V	15 V	15 V
Tolerance	—	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	40 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	50 nA @ 10.5 V	50 nA @ 10.5 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	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	-65°C 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	ROHS3 Compliant	ROHS3 Compliant	Not Specified	Not Specified

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The 1N5245B TR PBFREE (Central Semiconductor Corp) and 1N5245BTR (onsemi) are direct functional equivalents to the TZX15X-TAP. Both parts maintain identical zener voltage (15 V) and power rating (500 mW) specifications with improved impedance characteristics (16 Ohms versus 40 Ohms) and lower reverse leakage current. Both are ROHS3 compliant and rated for extended operating temperatures (-65°C to 200°C), providing superior performance margins. The 1N5245B TR PBFREE is available in higher inventory (19,774 pcs) and offers lead-free construction explicitly designated in the part number.

Secondary Substitutes (Functional Equivalence):

The BZX79C15-T50A and BZX79C15-T50R (Fairchild Semiconductor) are functionally equivalent alternatives with identical zener voltage and power specifications. These parts feature moderate impedance (30 Ohms) and the lowest reverse leakage current (50 nA @ 10.5 V) among all listed substitutes. Both are rated for -65°C to 200°C operation. Inventory availability is substantial (45,200 pcs for BZX79C15-T50A and 35,677 pcs for BZX79C15-T50R). RoHS compliance status is not specified for these Fairchild parts.

Compliance Considerations:

All substitute parts carry EAR99 export classification and REACH Unaffected status, matching the regulatory profile of the main part. The 1N5245B TR PBFREE and 1N5245BTR explicitly state ROHS3 compliance, while the Fairchild parts do not specify this certification in the provided data.

Frequently Asked Questions (FAQ)

Q: Can the 1N5245B TR PBFREE be used as a direct replacement for the TZX15X-TAP?

A: Yes. Both parts share identical zener voltage (15 V) and power dissipation (500 mW) specifications with DO-35 through-hole packaging. The 1N5245B TR PBFREE exhibits superior electrical characteristics with lower impedance and reverse leakage current, making it a direct functional substitute.

Q: What is the difference between the two Fairchild parts, BZX79C15-T50A and BZX79C15-T50R?

A: Both BZX79C15-T50A and BZX79C15-T50R are electrically identical with matching zener voltage, power rating, impedance, and reverse leakage specifications. The designation suffix (T50A versus T50R) indicates packaging or tape configuration differences. Both are functionally equivalent for circuit applications.

Q: Are there temperature range limitations when substituting the TZX15X-TAP?

A: The TZX15X-TAP operates from -65°C to 175°C. All listed substitute parts extend the upper temperature limit to 200°C, providing additional thermal margin. If the circuit design operates within the TZX15X-TAP temperature range, all substitutes are compatible. Applications requiring operation above 175°C benefit from the extended range of substitute parts.

Q: Does the impedance difference between parts affect circuit performance?

A: Impedance variations (16 Ohms to 40 Ohms) affect dynamic response and noise characteristics in voltage regulation circuits. Lower impedance values (1N5245B series at 16 Ohms) provide faster transient response and lower output impedance. Higher impedance values (TZX15X-TAP at 40 Ohms) are acceptable in applications with slower load transients. Circuit-specific requirements determine whether impedance differences are significant.

Q: Is the TZX15X-TAP automotive-qualified while substitutes are not?

A: The TZX15X-TAP carries AEC-Q101 automotive qualification. The substitute parts do not specify automotive qualification in the provided data. Applications requiring AEC-Q101 certification must use the TZX15X-TAP or verify automotive qualification status with the substitute part manufacturers.

Q: What packaging differences exist between the listed parts?

A: All parts use the DO-35 (DO-204AH) through-hole axial package. Packaging variations are limited to tape configuration (Cut Tape, Tape & Box, or Bulk). These differences affect supply format and handling but do not impact electrical performance or circuit compatibility.

Q: Can the BZX79C15-T50 series be used in applications requiring ROHS3 compliance?

A: ROHS3 compliance status is not specified for the BZX79C15-T50A and BZX79C15-T50R in the provided data. Applications with mandatory ROHS3 requirements should use the 1N5245B TR PBFREE or 1N5245BTR, both explicitly certified as ROHS3 compliant.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message