1N5253B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5253B-TP is a 25 V, 500 mW Zener diode manufactured by Micro Commercial Co in DO-35 axial package configuration. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The 1N5253B-TP maintains electrical and mechanical specifications suitable for voltage regulation and transient protection applications in through-hole circuit designs.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	25	V
Power - Maximum	500	mW
Tolerance	±5%	—
Impedance (Maximum)	35	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 19 V
Voltage - Forward (Maximum) @ If	1.1	V @ 200 mA
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	DO-35 (DO-204AH)	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 1N5253B-TP is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage (Vz): 25 V nominal
Maximum power dissipation: 500 mW
Package type: DO-35 axial through-hole
Reverse leakage current: 100 nA @ 19 V
Impedance (Zzt): 35 Ohms maximum

Tolerance Considerations: The 1N5253B-TP specifies ±5% tolerance. Substitute parts with tighter tolerance specifications (±2%) remain electrically compatible and provide enhanced precision for voltage regulation applications.

Compliance and Status: Active substitute parts are preferred over obsolete components. RoHS3 compliance and automotive-grade qualifications (AEC-Q101) represent enhanced specifications that do not preclude substitution but indicate superior product lifecycle status and environmental compliance.

Parameter Comparison

Parameter	1N5253B-TP (Main)	1N5253B (Microchip)	1N5253C-TAP (Vishay)	1N5253C-TR (Vishay)
Manufacturer	Micro Commercial Co	Microchip Technology	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - Zener (Nom)	25 V	25 V	25 V	25 V
Tolerance	±5%	±5%	±2%	±2%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	35 Ohms	35 Ohms	35 Ohms	35 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 19 V	100 nA @ 19 V	100 nA @ 19 V	100 nA @ 19 V
Voltage - Forward (Max) @ If	1.1 V @ 200 mA	1.5 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature Range	-55 to 150°C	-65 to 175°C	175°C (Max)	175°C (Max)
Package / Case	DO-35 (DO-204AH)	DO-35 (DO-204AH)	DO-35 (DO-204AH)	DO-35 (DO-204AH)
Packaging Format	Cut Tape (CT)	Bulk	Tape & Box (TB)	Tape & Reel (TR)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS Non-compliant	ROHS3 Compliant	ROHS3 Compliant
Automotive Grade / AEC-Q101	—	—	Yes	Yes

Engineering Selection Recommendations

Primary Substitute: 1N5253C-TR (Vishay General Semiconductor)

The 1N5253C-TR is the preferred substitute for the obsolete 1N5253B-TP. This part maintains identical electrical specifications (25 V, 500 mW, 35 Ohms impedance, 100 nA reverse leakage) with the following advantages:

Active product status ensures long-term availability and supply chain continuity
ROHS3 compliance aligns with current environmental regulations
AEC-Q101 automotive qualification provides enhanced reliability documentation
Tighter ±2% tolerance improves voltage regulation precision
Tape & Reel packaging supports automated assembly processes
Forward voltage specification (1.1 V @ 200 mA) matches the original part exactly

Secondary Substitute: 1N5253C-TAP (Vishay General Semiconductor)

The 1N5253C-TAP provides identical electrical performance to the 1N5253C-TR with equivalent active status, RoHS3 compliance, and AEC-Q101 qualification. Tape & Box packaging is suitable for manual assembly or lower-volume applications.

Tertiary Substitute: 1N5253B (Microchip Technology)

The 1N5253B from Microchip Technology maintains electrical equivalence with ±5% tolerance matching the original part. However, this substitute presents the following considerations:

Active product status supports procurement continuity
RoHS non-compliance may conflict with environmental requirements in regulated applications
Forward voltage specification (1.5 V @ 200 mA) exceeds the original part by 0.4 V, affecting circuit performance in forward-biased conditions
Bulk packaging requires manual handling and sorting

Frequently Asked Questions (FAQ)

Q: Can the 1N5253C-TR directly replace the 1N5253B-TP without circuit modification?

A: Yes. The 1N5253C-TR maintains identical zener voltage (25 V), power rating (500 mW), impedance (35 Ohms), and reverse leakage current (100 nA @ 19 V). The tighter ±2% tolerance and matching forward voltage (1.1 V @ 200 mA) ensure direct functional equivalence. The DO-35 axial package is mechanically identical.

Q: What is the significance of the ±2% tolerance in the Vishay 1N5253C variants compared to the ±5% tolerance of the original part?

A: Tighter tolerance specifications provide improved voltage regulation accuracy. The ±2% tolerance in 1N5253C-TR and 1N5253C-TAP reduces zener voltage variation across the specified range, resulting in more stable voltage reference performance. This represents an enhancement over the original ±5% specification and does not introduce compatibility issues.

Q: Why does the Microchip 1N5253B show a forward voltage of 1.5 V @ 200 mA while the original part specifies 1.1 V?

A: Forward voltage variation reflects differences in semiconductor processing and junction characteristics between manufacturers. The 0.4 V difference in the Microchip part may affect circuit performance in applications where forward-biased operation occurs. For voltage regulation applications where the diode operates in reverse bias, this parameter is not critical.

Q: Are the Vishay 1N5253C-TR and 1N5253C-TAP interchangeable?

A: Yes. Both parts are electrically identical with the same zener voltage, power rating, tolerance, and impedance. The difference is packaging format: 1N5253C-TR uses Tape & Reel for automated assembly, while 1N5253C-TAP uses Tape & Box for manual or semi-automated processes. Selection depends on assembly method and procurement volume requirements.

Q: What does AEC-Q101 qualification indicate?

A: AEC-Q101 is an automotive industry standard qualification for discrete semiconductors. Parts meeting this qualification undergo rigorous testing for reliability, temperature cycling, and performance consistency. The Vishay 1N5253C variants carry this qualification, indicating suitability for automotive and high-reliability applications.

Q: Is RoHS3 compliance mandatory for substitution?

A: RoHS3 compliance is not mandatory for electrical substitution but is required in many regulated markets and applications. The Vishay 1N5253C variants (1N5253C-TR and 1N5253C-TAP) are ROHS3 compliant, matching the original 1N5253B-TP. The Microchip 1N5253B is RoHS non-compliant and may not be acceptable in applications subject to environmental regulations.

Q: Can the 1N5253B-TP be used in new designs, or must substitutes be selected?

A: The 1N5253B-TP is classified as obsolete, indicating discontinued manufacturing and limited future availability. For new designs, active substitute parts (1N5253C-TR, 1N5253C-TAP, or 1N5253B from Microchip) are recommended to ensure long-term supply chain viability and compliance with current environmental standards.

Q: What is the difference between Cut Tape (CT), Tape & Reel (TR), and Tape & Box (TB) packaging?

A: Cut Tape (CT) provides individual components cut from tape for manual handling. Tape & Reel (TR) supplies components on continuous reel for automated pick-and-place assembly. Tape & Box (TB) provides tape-packaged components in box quantities for semi-automated or manual assembly. All three formats contain electrically identical components; selection depends on assembly process and volume requirements.

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