Diodes Incorporated 1N5262B-T

Overview

1N5262B-T from Diodes Incorporated is a 51 V, ±5% tolerance, 500 mW hermetic glass-encapsulated Zener diode in DO-35 package, designed for precision voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and analog signal conditioning stages operating from -65°C to +175°C.

For engineers reviewing the 1N5262B-T datasheet, 1N5262B-T pinout, 1N5262B-T application, or 1N5262B-T equivalent, key selection criteria include its 2.5 mA test current, 125 Ω dynamic impedance at I_ZT, +0.096 %/°C temperature coefficient, cathode-band polarity marking, and RoHS-compliant Sn96.5Ag3.5 terminations.

Technical Context

This discrete Zener diode operates in reverse breakdown mode with tightly controlled V_Z = 48.45–53.55 V at I_ZT = 2.5 mA and exhibits low dynamic impedance (Z_ZT = 125 Ω) for stable regulation under varying load conditions. Its hermetic glass DO-35 package ensures long-term parameter stability in harsh thermal environments.

The device delivers 500 mW power dissipation with R_θJA = 300 °C/W and supports operation across -65°C to +175°C. Its +0.096 %/°C temperature coefficient enables predictable drift behavior in temperature-sensitive reference designs where compensation is required.

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; moisture sensitivity Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5262B and 1N4733A, the 1N5262B-T offers unique hermetic reliability and exact 500 mW/DO-35 fit for legacy through-hole designs requiring long-term parameter stability, while the alternatives trade packaging or power rating for different assembly or thermal needs.

Availability

1N5262B-T is available at Aetrix Electronics and suitable for switch-mode power supply feedback, industrial sensor reference, and overvoltage clamp protection requiring stable component supply despite its obsolete status.

Supply support for 1N5262B-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, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The 1N52xxB series belongs to Diodes' legacy Zener diode product line, engineered specifically for precision voltage reference and regulation in cost-sensitive, high-volume applications demanding hermetic stability and wide temperature operation.

FAQ

Is the 1N5262B-T still in active production?

No - Diodes Incorporated has officially discontinued the 1N5262B-T and marked it "OBSOLETE" in DS18006 Rev. 19. It remains available through authorized distributors and Aetrix Electronics' legacy inventory with full traceability, but no new manufacturing runs are planned. Customers should evaluate MMSZ5262B or 1N4733A for new designs.

What is the maximum allowable junction temperature for continuous operation?

The 1N5262B-T is rated for continuous operation with junction temperature (T_J) from -65°C to +175°C. At ambient temperatures above 75°C, power dissipation must be linearly derated per Note 5: P_D = 500 mW × (1 − (T_A − 75)/225), assuming leads held at ≤75°C with 9.5 mm length.

How does the +0.096 %/°C temperature coefficient affect circuit accuracy?

A +0.096 %/°C coefficient means V_Z increases by approximately 48.96 mV per °C rise from 25°C baseline. Over a 100°C range (−25°C to +75°C), this results in ~4.9 V total drift - requiring compensation in high-accuracy references or limiting use to narrow ambient bands unless calibrated.

Can the 1N5262B-T replace the 1N5262A in existing designs?

No - the 1N5262A has ±10% V_Z tolerance versus ±5% for the 1N5262B-T. Substituting introduces up to ±5.1 V additional uncertainty in regulation voltage, potentially violating system accuracy specs. The B-grade part is not a drop-in replacement for A-grade without circuit validation.