1N5262 Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5262 is a through-hole zener diode rated for 51 V nominal zener voltage with 500 mW maximum power dissipation in a DO-35 axial package. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The 1N5262 was manufactured by SMC Diode Solutions and is suitable for voltage regulation and protection applications requiring precise 51 V reference characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	51	V
Power - Max	500	mW
Impedance (Max)	125	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 39 V	nA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	V
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature	200	°C (Max)

Substitute Part Grouping Explanation

Substitution of the 1N5262 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage: 51 V nominal
Maximum power dissipation: 500 mW
Package type: DO-35 axial through-hole
Impedance (Max): 125 Ohms
Reverse leakage current: 100 nA @ 39 V
Forward voltage: 1.1 V @ 200 mA

The 1N5262B TR PBFREE manufactured by Central Semiconductor Corp meets all electrical specifications of the original part. This substitute is currently in active production status, ensuring long-term availability and supply chain continuity. The substitute maintains identical zener voltage, power rating, impedance, and thermal characteristics while adding ±5% voltage tolerance specification and extended operating temperature range documentation.

Parameter Comparison

Parameter	1N5262 (Original)	1N5262B TR PBFREE (Substitute)
Manufacturer	SMC Diode Solutions	Central Semiconductor Corp
Voltage - Zener (Nom)	51 V	51 V
Tolerance	Not specified	±5%
Power - Max	500 mW	500 mW
Impedance (Max)	125 Ohms	125 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 39 V	100 nA @ 39 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature	200°C (Max)	−65°C to 200°C
Mounting Type	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Product Status	Obsolete	Active
RoHS Status	Not specified	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The 1N5262B TR PBFREE is a direct functional equivalent suitable for replacement of the obsolete 1N5262. Selection of this substitute is based on the following factors:

Product Status: The original 1N5262 is obsolete, making the active 1N5262B TR PBFREE the appropriate choice for new designs and ongoing production support.

Electrical Equivalence: All critical electrical parameters match the original specification: 51 V zener voltage, 500 mW power rating, 125 Ohms maximum impedance, and identical leakage and forward voltage characteristics.

Compliance: The 1N5262B TR PBFREE carries ROHS3 compliance certification and maintains REACH Unaffected status, meeting current regulatory requirements for electronic component procurement.

Thermal Performance: The substitute provides an extended operating temperature range (−65°C to 200°C) compared to the original specification, offering improved performance margin in temperature-sensitive applications.

Package Compatibility: Both parts use identical DO-35 axial through-hole packaging, ensuring direct mechanical and electrical compatibility in existing circuit board layouts without modification.

Frequently Asked Questions (FAQ)

Q: Can the 1N5262B TR PBFREE be used as a direct replacement for the 1N5262 without circuit modification?

A: Yes. The 1N5262B TR PBFREE is electrically and mechanically equivalent to the 1N5262. Both components share identical zener voltage (51 V), power rating (500 mW), impedance (125 Ohms), and DO-35 axial package configuration. No circuit redesign is required.

Q: What is the significance of the ±5% tolerance specification on the 1N5262B TR PBFREE?

A: The ±5% tolerance on the substitute part provides explicit specification of zener voltage accuracy. This tolerance band ensures the 51 V nominal voltage remains within 48.45 V to 53.55 V across the component population. The original 1N5262 does not specify tolerance, making the substitute's explicit tolerance a design advantage for precision voltage regulation applications.

Q: Are there differences in thermal performance between the original and substitute parts?

A: The 1N5262B TR PBFREE specifies an extended operating temperature range of −65°C to 200°C, whereas the original 1N5262 specifies only a maximum of 200°C. Both parts maintain identical 500 mW power dissipation capability. The extended lower temperature specification on the substitute provides additional operational margin in cold environment applications.

Q: Does the ROHS3 compliance of the 1N5262B TR PBFREE affect electrical performance?

A: No. ROHS3 compliance indicates the component meets hazardous substance restrictions and does not alter electrical characteristics. The substitute maintains all electrical parameters of the original part while meeting current environmental compliance standards.

Q: Is the DO-35 package identical between the original and substitute parts?

A: Yes. Both the 1N5262 and 1N5262B TR PBFREE use the DO-204AH, DO-35 axial package designation. This ensures identical physical dimensions, lead spacing, and mounting compatibility in through-hole circuit board applications.

Q: What is the moisture sensitivity level for both parts?

A: Both the original 1N5262 and the 1N5262B TR PBFREE carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions. These components do not require special moisture control during storage, handling, or assembly.

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