1N5235B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5235B is a through-hole zener diode rated at 6.8 V nominal with 500 mW power dissipation capability, packaged in DO-35 (DO-204AH) axial configuration. This component is classified as obsolete by the original manufacturer (SMC Diode Solutions), necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability for new production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	6.8	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	3	µA
Voltage - Forward (Vf) (Max) @ If	1.1 @ 200	V @ mA
Mounting Type	Through Hole
Package / Case	DO-35, DO-204AH, Axial

Substitute Part Grouping Explanation

Substitution of the 1N5235B is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Zener voltage: 6.8 V nominal
Tolerance: ±5%
Maximum power dissipation: 500 mW
Package type: DO-35 axial through-hole
Maximum impedance: 5 Ohms
Reverse leakage current: 3 µA specification
Forward voltage: 1.1 V maximum at 200 mA

The substitute part 1N5235B TR PBFREE (Central Semiconductor Corp) meets all electrical specifications and maintains identical package configuration. This part is classified as active product status with ROHS3 compliance and extended operating temperature range (-65°C to 200°C), providing enhanced supply availability compared to the obsolete original part.

Parameter Comparison

Parameter	1N5235B (SMC)	1N5235B TR PBFREE (Central Semiconductor)	Match Status
Voltage - Zener (Nom)	6.8 V	6.8 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	5 Ohms	5 Ohms	Equivalent
Current - Reverse Leakage @ Vr	3 µA @ 4.8 V	3 µA @ 5 V	Equivalent
Voltage - Forward (Vf) (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
Operating Temperature	200°C	-65°C ~ 200°C	Extended Range

Engineering Selection Recommendations

The 1N5235B TR PBFREE from Central Semiconductor Corp is the direct functional equivalent for the obsolete 1N5235B. Selection of this substitute part is based on:

Product Status: The substitute maintains active product status, ensuring continued availability and manufacturing support, whereas the original part is obsolete.

Electrical Equivalence: All critical electrical parameters—zener voltage, tolerance, power rating, impedance, and leakage current—are identical to the original specification.

Compliance Certification: The substitute part carries ROHS3 compliance certification, meeting current regulatory requirements for electronic component manufacturing and distribution.

Package Compatibility: Both parts utilize identical DO-35 axial through-hole packaging, enabling direct mechanical and electrical substitution without circuit board redesign.

Operating Temperature: The substitute part extends the operating temperature range to -65°C to 200°C, providing broader environmental operating capability compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can the 1N5235B TR PBFREE be used as a direct replacement for the 1N5235B?

A: Yes. The 1N5235B TR PBFREE is electrically and mechanically equivalent. All electrical parameters—6.8 V zener voltage, ±5% tolerance, 500 mW power rating, 5 Ohms maximum impedance, and 3 µA reverse leakage current—are identical. The DO-35 axial package is the same, enabling direct substitution without circuit modification.

Q: What is the difference between the original 1N5235B and the substitute 1N5235B TR PBFREE?

A: The primary differences are product status and compliance. The original 1N5235B is obsolete, while the 1N5235B TR PBFREE is active. The substitute carries ROHS3 compliance certification and extends the operating temperature range to -65°C to 200°C. All electrical specifications remain identical.

Q: Does the extended operating temperature range of the substitute part affect circuit performance?

A: No. The extended temperature range (-65°C to 200°C) of the substitute part is a superset of the original specification. The zener voltage, tolerance, and all other electrical parameters remain unchanged across the operating range.

Q: Is the 1N5235B TR PBFREE available in the same packaging format?

A: Yes. Both parts use DO-35 axial through-hole packaging (DO-204AH). The physical dimensions and lead configuration are identical, allowing direct board-level substitution.

Q: What does "TR PBFREE" designation indicate?

A: The "TR" designation indicates tape reel packaging format (Cut Tape), and "PBFREE" indicates lead-free (RoHS compliant) manufacturing. This does not affect electrical performance or functional equivalence.

Q: Are there any circuit design considerations when substituting this part?

A: No design changes are required. The electrical specifications are identical, and the package is the same. The part functions identically in all circuit applications where the original 1N5235B was used.

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