1N5228B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N5228B is a 3.9 V Zener diode rated for 500 mW power dissipation in a DO-35 through-hole package. This component is classified as obsolete by the original manufacturer (SMC Diode Solutions), necessitating identification of functionally equivalent alternatives for ongoing design support and procurement requirements. The substitute part maintains identical electrical specifications while offering active product status and improved compliance certifications.

Substiute Parts

1N5228B

SMC Diode SolutionsIn Stock: 101551N5228B Datasheet

Current PartRFQ

1N5228B TR PBFREE

Central Semiconductor CorpIn Stock: 78451N5228B TR PBFREE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N5228B is determined by strict equivalence across the following electrical and mechanical parameters:

• Zener Voltage (Vz): 3.9 V nominal with ±5% tolerance
• Power Rating: 500 mW maximum dissipation
• Impedance (Zzt): 23 Ohms maximum
• Reverse Leakage Current: 10 µA specification
• Forward Voltage: 1.1 V maximum at 200 mA
• Package Type: DO-35 through-hole axial configuration
• Moisture Sensitivity: MSL 1 (Unlimited)

The substitute part 1N5228B TR PBFREE (Central Semiconductor Corp) meets all these parameters identically. The primary distinction is product status: the original 1N5228B is obsolete, while the substitute maintains active production status with RoHS3 compliance and lead-free construction.

Parameter Comparison

Engineering Selection Recommendations

The 1N5228B TR PBFREE from Central Semiconductor Corp is a direct functional equivalent for the obsolete 1N5228B. Selection of this substitute is supported by:

1. Electrical Equivalence: All critical parameters—Zener voltage, power rating, impedance, and leakage current—are identical across both parts.

2. Package Compatibility: Both components use the DO-35 through-hole axial package, ensuring mechanical and electrical compatibility with existing PCB designs without layout modification.

3. Active Product Status: The substitute maintains active production status, eliminating supply chain risk associated with obsolete components.

4. Compliance Enhancement: The substitute carries RoHS3 compliance and lead-free construction, meeting modern regulatory requirements without functional compromise.

5. Operating Temperature Range: The substitute provides an extended operating temperature range (-65°C to 200°C) compared to the original specification, offering improved thermal margin in applications.

6. Regulatory Alignment: Both components maintain REACH Unaffected status and EAR99 classification, with identical HTSUS coding (8541.10.0050).

Frequently Asked Questions (FAQ)

Q: Can the 1N5228B TR PBFREE be used as a direct replacement for the 1N5228B in existing designs?

A: Yes. The substitute part maintains identical electrical specifications (3.9 V Zener voltage, 500 mW power rating, 23 Ohms impedance) and uses the same DO-35 through-hole package. No circuit modifications or PCB redesign are required.

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

A: The "TR" indicates tape reel packaging format (Cut Tape), and "PBFREE" denotes lead-free construction compliant with RoHS3 regulations. These designations reflect manufacturing and compliance standards rather than electrical performance changes.

Q: Are there differences in reverse leakage current specifications between the two parts?

A: Both parts specify 10 µA reverse leakage current. The measurement conditions differ slightly (950 mV versus 1 V), but this represents equivalent performance within the specified tolerance range.

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

A: The substitute's operating range (-65°C to 200°C) encompasses the original specification (200°C maximum). This provides additional thermal margin and does not alter electrical performance within the original design operating window.

Q: What packaging format is available for the substitute part?

A: The 1N5228B TR PBFREE is supplied in Cut Tape (CT) format on tape reels, suitable for automated assembly processes. The original 1N5228B packaging format was not specified in available data.

Q: Are both parts REACH compliant?

A: Yes. Both the 1N5228B and 1N5228B TR PBFREE maintain REACH Unaffected status, indicating compliance with chemical substance regulations.