Diodes Incorporated 1N4759A-T

Overview

1N4759A-T from Diodes Incorporated is a 1.0W, 62V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and overvoltage protection in DC power rails. It delivers 4.0mA test current, 125Ω maximum Zener impedance at IZT, and operates across –65°C to +175°C with cathode band polarity marking.

For engineers reviewing the 1N4759A-T datasheet, 1N4759A-T pinout, 1N4759A-T application, or 1N4759A-T equivalent, key selection criteria include nominal Zener voltage (62V), power dissipation (1.0W), thermal resistance (175°C/W), Zener impedance (125Ω), and reverse leakage (≤5µA at 47.1V).

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 62V nominal Zener voltage is specified at 4.0mA test current (IZT), with a sharp knee ensured by dual-point Zener impedance measurement per JEDEC standards.

The device exhibits a positive temperature coefficient of +0.06% to +0.095%/°C, enabling predictable voltage drift in temperature-sensitive circuits. Its DO-41 glass package provides UL 94V-0 flammability rating and Sn96.5Ag3.5 solderable terminations compliant with MIL-STD-202 Method 208.

Key Specifications

Pinout & Package

DO-41 glass axial package with cathode band marking; leads are Sn96.5Ag3.5 solderable, UL 94V-0 rated, weight ≈0.35 g.

Key Features

Applications

Availability

1N4759A-T is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU reference voltage, and telecom line card protection requiring stable component supply and long-term obsolescence management.

Supply support for 1N4759A-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, serving industrial, computing, consumer, and communications markets with high-reliability components.

The 1N47xxA series belongs to Diodes' legacy Zener diode product line, engineered for cost-effective, high-stability voltage reference and clamping in non-automotive-grade applications where wide temperature range and tight tolerance are critical.

FAQ

What is the maximum surge current rating for 1N4759A-T?

The 1N4759A-T is rated for 70A peak surge current under an 8.3ms unidirectional exponential waveform, as defined in the Electrical Characteristics table. This value corresponds to its ability to absorb transient energy without parametric shift or physical failure, consistent with standard Zener surge testing methodology.

Is 1N4759A-T RoHS-compliant and lead-free?

Yes, the 1N4759A-T features a lead-free Sn96.5Ag3.5 finish and complies with EU Directive 2002/95/EC (RoHS), including applicable exemptions for glass passivation and high-temperature soldering. Full compliance documentation is available in Diodes' AP02008 packaging specification.

How does thermal derating apply to 1N4759A-T above 50°C?

Above 50°C ambient, the 1N4759A-T must be derated at 6.67 mW/°C, reducing maximum power dissipation linearly. At 100°C ambient, usable power drops to 0.667W. Derating assumes 9.5mm lead length from case and proper PCB thermal relief per datasheet Note 1.

Why is the 1N4759A-T marked as obsolete with no alternate part?

Diodes Incorporated officially discontinued the 1N4759A-T and declared no functional replacement, as noted in DS18007 Rev. 20–4. This reflects strategic portfolio rationalization; design-in requires verification of long-term supply commitment through Aetrix's lifecycle management program.