1N5263B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5263B is a 56 V, 500 mW Zener diode in DO-35 axial package designed for voltage regulation and protection applications. Manufactured by Central Semiconductor Corp, this component is currently classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability. The substitute part maintains identical electrical specifications while offering improved product status and compliance certifications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	56	V
Tolerance	±5	%
Power - Maximum	500	mW
Impedance (Maximum)	150	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 43 V	nA
Voltage - Forward (Maximum) @ If	1.1 V @ 200 mA	V
Operating Temperature Range	-65 to 200	°C
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 1N5263B is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

Zener voltage: 56 V nominal
Tolerance: ±5%
Maximum power dissipation: 500 mW
Maximum impedance: 150 Ohms
Reverse leakage current: 100 nA @ 43 V
Forward voltage: 1.1 V @ 200 mA

Physical & Mechanical Specifications:

Package type: DO-35 axial through-hole
Mounting configuration: Through-hole

Environmental & Compliance:

Moisture sensitivity: MSL 1 (Unlimited)
REACH status: REACH Unaffected
ECCN classification: EAR99

The substitute part 1N5263B-TR meets all these criteria and is manufactured by Vishay General Semiconductor - Diodes Division with active product status.

Parameter Comparison

Parameter	1N5263B (Central Semiconductor)	1N5263B-TR (Vishay)	Match
Voltage - Zener (Nominal)	56 V	56 V	✓
Tolerance	±5%	±5%	✓
Power - Maximum	500 mW	500 mW	✓
Impedance (Maximum)	150 Ohms	150 Ohms	✓
Current - Reverse Leakage @ Vr	100 nA @ 43 V	100 nA @ 43 V	✓
Voltage - Forward (Maximum) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	✓
Operating Temperature Range	-65°C to 200°C	-65°C to 175°C	Partial*
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	✓
Mounting Type	Through Hole	Through Hole	✓
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	✓
Product Status	Obsolete	Active	Improved
RoHS Status	Request inventory verification	ROHS3 Compliant	Improved
Qualification	—	AEC-Q101	Added

*Operating temperature upper limit: 1N5263B-TR rated to 175°C versus 1N5263B rated to 200°C. Applications requiring operation above 175°C require design review.

Engineering Selection Recommendations

Primary Substitute: 1N5263B-TR (Vishay General Semiconductor - Diodes Division)

The 1N5263B-TR is the direct functional equivalent for the obsolete 1N5263B. Selection of this substitute is based on the following engineering factors:

Product Status: The 1N5263B-TR maintains active product status with confirmed inventory availability (10,400 pcs), ensuring long-term supply chain continuity compared to the obsolete 1N5263B.

Electrical Equivalence: All critical electrical parameters are identical: 56 V nominal Zener voltage, ±5% tolerance, 500 mW maximum power dissipation, 150 Ohms maximum impedance, and matching forward/reverse characteristics.

Compliance & Certifications: The 1N5263B-TR is ROHS3 compliant and carries AEC-Q101 automotive qualification, providing enhanced compliance documentation compared to the original part.

Package Compatibility: Both parts use identical DO-35 axial through-hole packaging, enabling direct mechanical substitution without PCB redesign.

Temperature Consideration: The 1N5263B-TR operating range (-65°C to 175°C) is narrower than the original part (-65°C to 200°C) by 25°C at the upper limit. Applications operating above 175°C require alternative component selection or thermal management review.

Frequently Asked Questions (FAQ)

Q: Can 1N5263B-TR be used as a direct replacement for 1N5263B in existing designs?

A: Yes. The 1N5263B-TR is electrically and mechanically equivalent across all specified parameters. No circuit modifications are required. The substitute part is pin-compatible and functionally identical for standard voltage regulation and protection applications.

Q: What is the difference in operating temperature range?

A: The 1N5263B operates from -65°C to 200°C, while the 1N5263B-TR operates from -65°C to 175°C. The substitute part has a 25°C lower maximum temperature rating. For applications requiring operation above 175°C, alternative components must be evaluated.

Q: Are there packaging differences between the two parts?

A: No. Both parts use DO-35 axial through-hole packaging (DO-204AH designation). Physical dimensions, lead configuration, and PCB mounting are identical.

Q: What compliance advantages does the substitute part offer?

A: The 1N5263B-TR is ROHS3 compliant and carries AEC-Q101 automotive qualification. The original 1N5263B requires RoHS status verification. These certifications support regulatory compliance and automotive application requirements.

Q: Is the 1N5263B-TR available in different packaging formats?

A: The 1N5263B-TR is supplied in Cut Tape (CT) packaging. The original 1N5263B packaging format is not specified in available data. Both parts are functionally identical; packaging format selection depends on assembly process requirements.

Q: What is the impedance specification and why is it important?

A: Maximum impedance is specified as 150 Ohms for both parts. This parameter affects transient response and voltage regulation performance. Both parts meet identical impedance specifications, ensuring equivalent circuit behavior.

Q: Can these parts be used interchangeably in automotive applications?

A: The 1N5263B-TR carries AEC-Q101 qualification, making it suitable for automotive use. The original 1N5263B does not list automotive qualification. For automotive applications, the 1N5263B-TR is the preferred selection.

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