Diodes Incorporated 1N5223B-T

Overview

1N5223B-T from Diodes Incorporated is a 2.7 V, ±5% tolerance, 500 mW glass-encapsulated Zener diode in DO-35 package, designed for precision voltage regulation and reference in low-power analog circuits, power supply feedback loops, and overvoltage protection. It delivers stable Zener impedance of 30 Ω at 20 mA test current, operates from –65°C to +175°C, and features hermetic sealing with Sn96.5Ag3.5 solderable terminals.

For engineers reviewing the 1N5223B-T datasheet, 1N5223B-T pinout, 1N5223B-T application, or 1N5223B-T equivalent, key selection considerations include its 2.7 V nominal Zener voltage, ±5% tolerance, 30 Ω dynamic impedance at I_ZT, 75 µA maximum reverse leakage at rated VR, and DO-35 mechanical compatibility with legacy through-hole designs requiring stable low-voltage references.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable 2.7 V reference across varying load and line conditions. Its 30 Ω Zener impedance at 20 mA ensures minimal output voltage variation under current changes, while the –0.080 %/°C temperature coefficient enables predictable drift compensation in temperature-sensitive circuits.

The DO-35 glass package provides hermetic sealing and high thermal stability, supporting operation up to +175°C ambient. With 500 mW power dissipation (derated above 75°C lead temperature), it suits space-constrained, low-to-medium power applications where reliability and long-term voltage stability are critical.

Key Specifications

Pinout & Package

DO-35 glass axial package with cathode band marking; two-terminal device with no internal complexity. Leads are Sn96.5Ag3.5 plated, solderable per MIL-STD-202 Method 208, and polarity identified by a single black band indicating the cathode terminal.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener reference applications.

Compared with MMSZ5223B and 1N4728A, the 1N5223B-T offers exact 2.7 V regulation in a proven DO-35 through-hole format with superior thermal stability at elevated temperatures, making it optimal for repair, legacy design continuity, and high-reliability analog reference roles where SMT conversion is impractical.

Availability

1N5223B-T is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and low-voltage precision reference applications requiring stable component supply and long-term obsolescence mitigation support.

Supply support for 1N5223B-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.

The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered for stable voltage reference and regulation in cost-sensitive, high-volume applications where long-term parametric consistency and hermetic reliability are essential.

FAQ

Is the 1N5223B-T still in production?

No - Diodes Incorporated has officially discontinued the 1N5223B-T and the entire 1N5221B–1N5267B family. Aetrix Electronics maintains limited legacy stock for repair and maintenance programs, with full traceability and documentation per original DS18006 Rev. 19 specifications.

What is the recommended replacement for new designs?

Diodes Incorporated recommends the MMSZ5223B as the functional replacement: same 2.7 V Zener voltage, ±5% tolerance, and 30 Ω Z_ZT, but in SOD-123 surface-mount packaging with 350 mW power rating and RoHS-compliant construction.

Can the 1N5223B-T be used in place of other 1N52xxB variants?

No - each 1N52xxB part has unique Zener voltage, test current, and impedance values. Substituting 1N5223B-T for, e.g., 1N5234B (6.2 V) would cause catastrophic regulation failure. Always verify voltage rating, tolerance, and Z_ZT against circuit requirements before substitution.

Does the DO-35 package support automated assembly?

The DO-35 axial package is primarily intended for manual or wave soldering. While some selective soldering systems handle DO-35, it is not optimized for pick-and-place automation. For high-volume SMT production, the MMSZ5223B in SOD-123 is the recommended alternative.