TZX5V1A-TAP Equivalent & Substitute Parts

Part Overview

The TZX5V1A-TAP is a 5.1 V Zener diode rated at 500 mW in a DO-35 through-hole package, manufactured by Vishay General Semiconductor - Diodes Division. 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 industrial and automotive systems. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.1	V
Power - Max	500	mW
Impedance (Max)	100	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AH (DO-35)	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of the TZX5V1A-TAP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 5.1 V nominal
Power dissipation: 500 mW maximum
Package type: DO-35 (DO-204AH) through-hole axial configuration
Operating temperature range: minimum -65°C to 175°C
Mounting type: Through hole

Secondary Compatibility Factors:

Voltage tolerance (±2% to ±5% acceptable)
Impedance characteristics (Zzt)
Reverse leakage current specifications
Forward voltage characteristics
RoHS and REACH compliance status

Substitute parts are grouped into two categories based on power rating alignment:

Category A - Full Power Rating Match (500 mW): Parts with identical 500 mW power dissipation in DO-35 package. These include 1N5231B, 1N5231BTR, 1N5231C, 1N751A TR PBFREE, and 1N751A-1.

Category B - Reduced Power Rating (250 mW): The 1N4625 TR PBFREE operates at 250 mW, representing a lower power capability suitable only for applications with reduced thermal requirements.

Category C - Alternate Package (DO-7): The 1N4625-1 maintains 500 mW power rating but uses DO-7 package instead of DO-35, requiring mechanical redesign consideration.

Parameter Comparison

Parameter	TZX5V1A-TAP	1N751A TR PBFREE	1N5231B	1N5231BTR	1N5231C	1N4625 TR PBFREE	1N4625-1	1N751A-1
Manufacturer	Vishay	Central Semiconductor	Microchip	onsemi	Fairchild	Central Semiconductor	Microchip	Microchip
Voltage - Zener (Nom)	5.1 V	5.1 V	5.1 V	5.1 V	5.1 V	5.1 V	5.1 V	5.1 V
Tolerance	-	±5%	±5%	±5%	±2%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW	250 mW	500 mW	500 mW
Impedance (Max)	100 Ohms	17 Ohms	17 Ohms	17 Ohms	17 Ohms	1500 Ohms	1500 Ohms	14 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 2 V	1 µA @ 1 V	5 µA @ 2 V	5 µA @ 2 V	5 µA @ 2 V	10 µA @ 3 V	5 µA @ 3 V	5 µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA	1.2 V @ 200 mA	1.1 V @ 200 mA	1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	-65 to 175°C	-65 to 200°C	-65 to 175°C	-65 to 200°C	-65 to 200°C	-65 to 200°C	-65 to 175°C	-65 to 175°C
Package / Case	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-204AH (DO-35)	DO-35	DO-204AH (DO-35)	DO-35	DO-204AA (DO-7)	DO-204AH (DO-35)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

Direct Equivalents (DO-35 Package, 500 mW, ROHS3 Compliant):

The 1N751A TR PBFREE and 1N5231BTR are the primary direct substitutes for the TZX5V1A-TAP. Both maintain identical power rating, package configuration, and ROHS3 compliance. The 1N751A TR PBFREE offers extended operating temperature range to 200°C and lower reverse leakage current (1 µA @ 1 V). The 1N5231BTR provides equivalent performance with onsemi manufacturing and identical impedance characteristics (17 Ohms).

Secondary Equivalents (DO-35 Package, 500 mW, RoHS Non-Compliant):

The 1N5231B and 1N751A-1 are functionally equivalent but do not meet ROHS3 compliance. These parts are suitable for applications where RoHS compliance is not mandated. The 1N5231B is available in higher inventory (15,422 pcs). The 1N751A-1 provides lower impedance (14 Ohms) and is manufactured by Microchip Technology.

Tighter Tolerance Alternative (DO-35 Package, 500 mW):

The 1N5231C from Fairchild Semiconductor offers ±2% voltage tolerance compared to ±5% on most alternatives, providing superior voltage regulation accuracy. This part is available in high inventory (23,040 pcs) and supports extended operating temperature to 200°C.

Reduced Power Rating Option (DO-35 Package, 250 mW):

The 1N4625 TR PBFREE operates at 250 mW and is suitable only for applications with lower power dissipation requirements. This part exhibits significantly higher impedance (1500 Ohms) and is not recommended as a direct substitute for 500 mW applications.

Alternate Package Option (DO-7 Package, 500 mW):

The 1N4625-1 maintains 500 mW power rating but uses DO-7 package instead of DO-35. This part requires mechanical redesign and is not recommended for direct board-level substitution without layout modification.

Compliance Considerations:

For automotive applications requiring AEC-Q101 qualification, the TZX5V1A-TAP is the only part in this list with explicit automotive grade designation. Substitute parts should be evaluated against specific automotive qualification requirements of the end application.

Frequently Asked Questions (FAQ)

Q: Can the 1N4625 TR PBFREE be used as a direct replacement for the TZX5V1A-TAP?

A: The 1N4625 TR PBFREE is not a direct replacement. While it maintains the 5.1 V zener voltage and DO-35 package, its 250 mW power rating is 50% lower than the TZX5V1A-TAP's 500 mW rating. This part is suitable only for applications with reduced thermal requirements. Additionally, its impedance of 1500 Ohms differs significantly from the main part's 100 Ohms, affecting voltage regulation characteristics.

Q: What is the difference between 1N5231B and 1N5231BTR?

A: Both parts are 5.1 V, 500 mW Zener diodes in DO-35 package with identical electrical characteristics. The primary difference is packaging: 1N5231B is supplied in bulk, while 1N5231BTR is supplied in cut tape. The 1N5231BTR is manufactured by onsemi and carries ROHS3 compliance, whereas 1N5231B is manufactured by Microchip and is RoHS non-compliant. The 1N5231BTR also supports extended operating temperature to 200°C.

Q: Why does the 1N4625-1 have a different package designation (DO-7 vs. DO-35)?

A: The 1N4625-1 uses DO-7 package instead of DO-35, despite maintaining the same 500 mW power rating and 5.1 V zener voltage. DO-7 and DO-35 are different through-hole axial package formats with different physical dimensions and lead spacing. Substitution requires mechanical redesign of the printed circuit board layout and is not recommended for direct component replacement.

Q: Is the 1N5231C suitable for applications requiring tighter voltage tolerance?

A: Yes. The 1N5231C offers ±2% voltage tolerance compared to ±5% on most alternative parts, providing superior voltage regulation accuracy. This part is suitable for precision voltage reference and regulation applications where tighter tolerance is required. It maintains 500 mW power rating, DO-35 package, and supports extended operating temperature to 200°C.

Q: Can I use a substitute part in an automotive application originally designed for the TZX5V1A-TAP?

A: The TZX5V1A-TAP carries explicit AEC-Q101 automotive qualification and automotive grade designation. Substitute parts in this list do not carry automotive qualification markings. Use of non-qualified parts in automotive applications requires engineering evaluation and approval against specific automotive qualification standards applicable to the end system.

Q: What is the significance of impedance differences between substitute parts?

A: Impedance (Zzt) affects the dynamic voltage regulation characteristics of the Zener diode. The TZX5V1A-TAP has 100 Ohms impedance, while most substitute parts (1N5231B, 1N5231BTR, 1N5231C, 1N751A TR PBFREE) have 17 Ohms. Lower impedance provides better voltage regulation under varying load conditions. The 1N4625 series parts have 1500 Ohms impedance, which is significantly higher and unsuitable for voltage regulation applications.

Q: Which substitute part offers the best inventory availability?

A: The 1N5231C from Fairchild Semiconductor has the highest inventory availability at 23,040 pieces. The 1N751A TR PBFREE has 31,387 pieces available. Both parts are suitable direct substitutes with 500 mW power rating and DO-35 package.

Q: Are all substitute parts RoHS compliant?

A: No. The 1N751A TR PBFREE and 1N5231BTR are ROHS3 compliant. The 1N5231B, 1N4625-1, and 1N751A-1 are RoHS non-compliant. The 1N4625 TR PBFREE is ROHS3 compliant. The 1N5231C compliance status is not specified in the provided data. Verify RoHS compliance requirements for your specific application before selection.

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

A: The TZX5V1A-TAP operates from -65°C to 175°C. Several substitute parts extend the upper temperature limit to 200°C: 1N751A TR PBFREE, 1N5231BTR, 1N5231C, and 1N4625 TR PBFREE. The 1N5231B, 1N4625-1, and 1N751A-1 maintain the -65°C to 175°C range. Extended temperature range may be beneficial for high-temperature applications but is not required for standard industrial use cases.

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