Taiwan Semiconductor Corporation 1N4758G

Overview

1N4758G from Taiwan Semiconductor is a 56 V, ±5% tolerance, 1 W hermetically sealed glass Zener diode in DO-41 package, designed for precision voltage reference and low-power stabilization in DC/DC converters, adapters, and lighting circuits.

For engineers reviewing the 1N4758G datasheet, 1N4758G pinout, 1N4758G application, or 1N4758G equivalent, key selection criteria include its 56 V nominal Zener voltage, 4.5 mA test current, 110 Ω dynamic impedance at IZT, 200 °C max junction temperature, and DO-41 mechanical compatibility with standard through-hole PCB layouts.

Technical Context

The 1N4758G operates as a single-die, silicon planar Zener diode with sharp reverse breakdown at 56 V under 4.5 mA test current. Its 110 Ω Zener impedance (ZZT) and 2000 Ω knee impedance (ZZK) reflect stable regulation performance near rated power.

Thermal design is enabled by a 53.5 °C/W junction-to-lead thermal resistance and 100 °C/W junction-to-ambient rating, supporting operation across –65 °C to +200 °C junction temperature range without derating below 25 °C ambient.

Key Specifications

Pinout & Package

Package: DO-41 - axial-leaded, hermetically sealed glass case with cathode band marking; 2.80 mm diameter, 5.20 mm body length, 3.80 mm lead spacing; RoHS-compliant pure tin-plated leads solderable per J-STD-002.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4758A and MMBZ5275B, the 1N4758G offers full 1 W power handling in through-hole DO-41, making it uniquely suited for adapter and industrial converter applications requiring robust thermal margin and legacy assembly compatibility.

Availability

1N4758G is available at Aetrix Electronics and suitable for low-voltage stabilizers, on-board DC/DC converters, and lighting applications requiring stable component supply with guaranteed long-term manufacturability and RoHS compliance.

Supply support for 1N4758G 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

Taiwan Semiconductor is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power management, protection, and signal conditioning components.

The 1N47xxG series was developed to deliver high-reliability, industry-standard Zener diodes with hermetic glass packaging and tight voltage tolerances for industrial power supply and consumer adapter applications.

FAQ

What is the nominal Zener voltage and tolerance of the 1N4758G?

The 1N4758G has a nominal Zener voltage of 56 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 53.2 V and 58.8 V at 25 °C and 4.5 mA test current. This tolerance is confirmed in the Electrical Specifications table of the Taiwan Semiconductor datasheet for the 1N4728G–1N4758G family, and applies directly to the 1N4758G part number.

What package type does the 1N4758G use, and what are its key mechanical features?

The 1N4758G uses the DO-41 axial-leaded package with hermetically sealed glass construction, pure tin-plated leads compliant with J-STD-002, and cathode polarity indicated by a visible band. Its dimensions include 2.80 mm body diameter, 5.20 mm body length, and 3.80 mm lead spacing-standardized for manual and automated through-hole assembly. The 1N4758G's DO-41 footprint ensures mechanical compatibility with legacy designs.

What is the maximum power dissipation and thermal resistance of the 1N4758G?

The 1N4758G has a maximum power dissipation (P_D) of 1 W at lead temperature ≤ 50 °C, with a junction-to-lead thermal resistance (R_θJL) of 53.5 °C/W and junction-to-ambient (R_θJA) of 100 °C/W. These values allow safe operation up to +200 °C junction temperature and define PCB copper requirements for thermal management. All values are specified in the Absolute Maximum Ratings and Thermal Performance sections of the official Taiwan Semiconductor datasheet for the 1N4758G.

How does the 1N4758G perform in terms of Zener impedance and leakage current?

The 1N4758G exhibits a Zener impedance (Z_ZT) of 110 Ω at 4.5 mA test current and a knee impedance (Z_ZK) of 2000 Ω at 0.25 mA, indicating stable regulation above its knee region. Its leakage current is ≤5 µA at 42.6 V reverse voltage (75% of VZ), confirming low off-state conduction. These parameters are measured per JEDEC standards and published in the Electrical Specifications table for the 1N4758G in the Taiwan Semiconductor datasheet.

Is the 1N4758G RoHS compliant and suitable for high-reliability applications?

Yes, the 1N4758G is RoHS compliant and features hermetically sealed glass packaging that ensures long-term parameter stability, moisture resistance, and reliability in demanding environments. Its –65 °C to +200 °C junction temperature range and 242 mg mass support use in automotive, industrial, and lighting applications where thermal cycling and environmental stress are present. This compliance and construction are explicitly stated in the Features and Mechanical Data sections of the Taiwan Semiconductor documentation for the 1N4758G.