Taiwan Semiconductor Corporation 1N4743G

Overview

1N4743G from Taiwan Semiconductor is a 1 W, 13 V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and reference applications with 10 Ω dynamic impedance at 19 mA test current and 0.25 mA maximum leakage at 9.9 V reverse bias.

For engineers reviewing the 1N4743G datasheet, 1N4743G pinout, 1N4743G application, or 1N4743G equivalent, key selection criteria include Zener voltage tolerance, power dissipation limit, thermal resistance (R_θJL = 53.5°C/W), junction temperature range (–65°C to +200°C), and DO-41 mechanical compatibility in low-voltage stabilizer designs.

Technical Context

The 1N4743G operates as a single-die, hermetically sealed glass Zener diode optimized for stable DC voltage reference and clamping in linear regulator feedback paths and adapter circuits. Its 13 V nominal Zener voltage is specified at I_ZT = 19 mA with ±5% tolerance and 10 Ω dynamic impedance (Z_ZT).

It exhibits low leakage (≤5 µA at V_R = 9.9 V) and supports operation across –65°C to +200°C junction temperature, enabled by pure tin-plated leads compliant with J-STD-002 solderability standards and DO-41 package thermal performance (R_θJA = 100°C/W).

Key Specifications

Pinout & Package

DO-41 glass axial package with two terminals: anode and cathode. Cathode identified by a painted band. Leads are pure tin-plated and 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 1N4743A and BZX55C13, the 1N4743G offers superior thermal performance (R_θJA = 100°C/W) and full 1 W dissipation in the standard DO-41 outline, making it optimal for higher-current voltage reference and shunt regulation tasks where thermal headroom is constrained.

Availability

1N4743G is available at Aetrix Electronics and suitable for low-voltage stabilizers, DC/DC converter references, and lighting drivers requiring stable component supply with RoHS-compliant, hermetically sealed Zener diodes.

Supply support for 1N4743G 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 Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and ESD protection components.

The 1N47xxG series was developed to deliver high-reliability, glass-encapsulated Zener diodes with tight voltage tolerance and robust thermal performance for industrial and consumer power management applications.

FAQ

What is the Zener voltage and tolerance of the 1N4743G?

The 1N4743G has a nominal Zener voltage of 13 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 12.35 V and 13.65 V at I_ZT = 19 mA and T_A = 25°C. This tolerance is confirmed in the Electrical Specifications table of the Taiwan Semiconductor datasheet (Version G2301) and applies to all units in the 1N4743G production lot.

What is the maximum power dissipation rating for the 1N4743G?

The 1N4743G is rated for 1 W maximum power dissipation at ambient temperature (T_A = 25°C). Derating is required above 25°C per the thermal resistance specification: R_θJA = 100°C/W. At 75°C ambient, the usable power drops to approximately 0.5 W to maintain T_J ≤ 200°C.

Does the 1N4743G have a specified Zener impedance, and at what condition?

Yes, the 1N4743G has a typical Zener impedance (Z_ZT) of 10 Ω, measured at the Zener test current I_ZT = 19 mA and T_A = 25°C. This value reflects dynamic resistance under small-signal AC conditions superimposed on the DC bias, directly impacting regulation stability in feedback loops.

What is the leakage current specification for the 1N4743G, and at what reverse voltage?

The 1N4743G specifies a maximum leakage current (I_R) of 5 µA at a reverse voltage (V_R) of 9.9 V, per the Electrical Specifications table. This parameter ensures minimal error current in high-impedance reference circuits and confirms adequate blocking behavior below the Zener knee.

Is the 1N4743G RoHS compliant and what package does it use?

Yes, the 1N4743G is RoHS compliant and uses the DO-41 axial glass package with hermetically sealed construction. The device features pure tin-plated leads meeting J-STD-002 solderability requirements and is marked with a cathode band for polarity identification - all confirmed in the Mechanical Data and Ordering Information sections of the Taiwan Semiconductor datasheet.