1N5262B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5262B is a through-hole zener diode rated at 51 V nominal voltage with 500 mW power dissipation capability, packaged in the DO-35 axial configuration. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity. The 1N5262B serves voltage regulation and protection applications requiring stable zener reference characteristics at 51 V.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	51	V
Tolerance	±5%	%
Power - Maximum	500	mW
Impedance (Maximum)	125	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 37 V	nA
Voltage - Forward (Maximum) @ If	1.1 V @ 200 mA	V
Mounting Type	Through Hole	—
Package / Case	DO-35, DO-204AH, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N5262B is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage (Vz): 51 V nominal
Tolerance: ±5%
Maximum power dissipation: 500 mW
Package type: DO-35 through-hole axial
Maximum impedance: 125 Ohms
Forward voltage and reverse leakage characteristics

The substitute part 1N5262B TR PBFREE meets all electrical specifications and maintains identical package geometry. Substitution is valid when all parameters listed above remain within specified tolerances and the package configuration supports direct board-level replacement.

Parameter Comparison

Parameter	1N5262B (Main)	1N5262B TR PBFREE (Substitute)	Match Status
Voltage - Zener (Nom)	51 V	51 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	125 Ohms	125 Ohms	Equivalent
Current - Reverse Leakage @ Vr	100 nA @ 37 V	100 nA @ 39 V	Equivalent
Voltage - Forward (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-35, DO-204AH, Axial	DO-35, DO-204AH, Axial	Equivalent
Product Status	Obsolete	Active	Substitute Available
RoHS Status	Not Specified	ROHS3 Compliant	Enhanced Compliance

Engineering Selection Recommendations

The 1N5262B TR PBFREE is a direct functional equivalent suitable for replacement of the obsolete 1N5262B. Selection of this substitute is based on the following factors:

Electrical Equivalence: All critical electrical parameters—zener voltage, tolerance, power rating, impedance, and leakage characteristics—are identical or within acceptable engineering margins.

Package Compatibility: Both components utilize the DO-35 through-hole axial package, enabling direct board-level substitution without layout modification.

Product Status: The 1N5262B TR PBFREE maintains active production status, ensuring supply chain continuity and availability for new production runs and field replacements.

Compliance Enhancement: The substitute part carries ROHS3 compliance certification, providing improved environmental and regulatory alignment compared to the obsolete original part.

Manufacturer Transition: Central Semiconductor Corp manufactures the substitute part, providing an established alternative source for the SMC Diode Solutions original component.

Frequently Asked Questions (FAQ)

Q: Can the 1N5262B TR PBFREE be used as a direct replacement for the 1N5262B?

A: Yes. The 1N5262B TR PBFREE is electrically and mechanically equivalent. All electrical parameters match the original specification, and the DO-35 package geometry is identical, permitting direct substitution without circuit modification.

Q: What is the significance of the "TR PBFREE" designation?

A: The "TR" suffix indicates tape reel packaging format (Cut Tape), while "PBFREE" denotes lead-free (RoHS3 compliant) construction. These designations reflect manufacturing and environmental compliance standards but do not affect electrical performance or functional equivalence.

Q: Are there differences in reverse leakage current between the main part and substitute?

A: The reverse leakage specification differs slightly in test voltage: the main part specifies 100 nA @ 37 V, while the substitute specifies 100 nA @ 39 V. Both values are within acceptable engineering tolerance and do not affect circuit performance in typical applications.

Q: Does the substitute part require any circuit design changes?

A: No. The 1N5262B TR PBFREE maintains identical electrical characteristics and package configuration. No circuit redesign, PCB layout modification, or application firmware changes are required.

Q: What is the operating temperature range for the substitute part?

A: The 1N5262B TR PBFREE operates across the temperature range of −65°C to +200°C, providing extended low-temperature performance compared to the main part specification.

Q: Is the substitute part suitable for new product designs?

A: Yes. The active production status and ROHS3 compliance of the 1N5262B TR PBFREE make it suitable for new designs requiring a 51 V, 500 mW zener diode in DO-35 package configuration.

Q: How does packaging format affect substitution?

A: The substitute part is supplied in Cut Tape (CT) format rather than bulk packaging. This affects procurement and handling but does not impact electrical performance or board-level installation. Standard tape-and-reel handling equipment is compatible with this format.

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