Diodes Incorporated 1N5232B-T

Overview

1N5232B-T from Diodes Incorporated is a 5.6 V, ±5% tolerance, 500 mW surface-mount Zener diode in a hermetic DO-35 glass package, designed for precision voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection. It delivers 11 Ω dynamic impedance at 20 mA test current, operates from –65°C to +175°C, and features a +0.038 %/°C temperature coefficient.

For engineers reviewing the 1N5232B-T datasheet, 1N5232B-T pinout, 1N5232B-T application, or 1N5232B-T equivalent, this part serves as a legacy discrete voltage reference requiring verification of thermal derating above 75°C, lead-free RoHS compliance, and substitution with MMSZ5232B for new designs due to obsolescence status.

Technical Context

The 1N5232B-T functions as a two-terminal shunt voltage regulator, maintaining stable 5.6 V output across varying load currents by operating in reverse breakdown. Its 11 Ω Zener impedance at I_ZT = 20 mA ensures tight regulation under moderate current conditions, while its +0.038 %/°C temperature coefficient minimizes drift in ambient-temperature-varying environments.

Designed for through-hole mounting (DO-35), it relies on 9.5 mm lead length and TL ≤ 75°C for full 500 mW dissipation; thermal resistance is 300 °C/W junction-to-ambient. The cathode band polarity marking and Sn96.5Ag3.5 solderable terminals comply with MIL-STD-202 and J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

Package: DO-35 glass axial-leaded hermetic package with cathode band marking; dimensions: A ≤25.4 mm, B ≤4.0 mm, C ≤0.6 mm, D ≤2.0 mm; weight ≈0.13 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5232B, the 1N5232B-T offers identical electrical specs but requires manual or wave soldering and occupies more board area; compared with 1N4734A, it provides tighter voltage tolerance and lower power, making it suitable for precision low-power references rather than general-purpose clamping.

Availability

1N5232B-T is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and power supply feedback applications requiring stable component supply despite its obsolete status and limited remaining inventory.

Supply support for 1N5232B-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, industry-standard components for power management, signal integrity, and protection.

The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered for cost-effective, stable voltage reference and clamping in consumer, industrial, and computing power systems.

FAQ

Is the 1N5232B-T still in active production?

No, the 1N5232B-T is officially obsolete and discontinued by Diodes Incorporated. It is no longer manufactured, and remaining stock is limited to legacy inventory. New designs should migrate to the MMSZ5232B surface-mount alternative, which matches all key electrical parameters and supports modern assembly processes.

What is the maximum allowable power dissipation at 100°C ambient?

At 100°C ambient, the 1N5232B-T must be derated: starting from 500 mW at 75°C, it loses 1.67 mW/°C above that point. At 100°C, maximum dissipation is 458 mW. This assumes leads are held at TL ≤ 75°C with 9.5 mm length; exceeding this thermal condition risks premature failure.

Can the 1N5232B-T be used in place of the 1N4734A?

No - the 1N5232B-T is rated for 5.6 V and 500 mW, while the 1N4734A is 6.2 V and 1 W. Substituting them would cause incorrect regulation voltage and insufficient power handling. Their DO-35 vs. DO-41 packages also differ mechanically, preventing direct socket replacement.

Does the 1N5232B-T require a heatsink for 500 mW operation?

No heatsink is specified or required, but thermal design is critical: full 500 mW dissipation is only valid if lead temperature (TL) is maintained at ≤75°C using 9.5 mm lead length and adequate PCB copper pour. Without controlled lead temperature, power must be derated per the 300 °C/W R_θJA specification to avoid junction overheating.