Taiwan Semiconductor Corporation 1N4734G A0G

Overview

1N4734G A0G from Taiwan Semiconductor is a 1 W, 5.6 V ±5% Zener diode in DO-41 package, designed for precision voltage regulation and reference applications with 45 mA test current, 5 Ω dynamic impedance at I_ZT, and 10 µA leakage at 2 V reverse bias. It operates across -65°C to +200°C junction temperature range and is used in low-voltage DC/DC converters and LED lighting power rails.

For engineers reviewing the 1N4734G A0G datasheet, 1N4734G A0G pinout, 1N4734G A0G application, or 1N4734G A0G equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (R_θJL = 53.5°C/W), power derating above 50°C, cathode-band polarity marking, and DO-41 lead finish compliance with J-STD-002 solderability.

Technical Context

This discrete Zener diode functions as a two-terminal voltage reference device, relying on controlled reverse-breakdown conduction. Its 5.6 V nominal Zener voltage is stabilized at 45 mA test current (I_ZT) with tight ±5% tolerance and low 5 Ω dynamic impedance (Z_ZT) under that condition.

Thermal design is critical: junction-to-lead resistance is 53.5°C/W, enabling effective heat transfer to PCB copper or heatsinking leads, while junction-to-ambient resistance is 100°C/W in free-air conditions. The hermetically sealed glass DO-41 package ensures long-term stability and moisture resistance in industrial environments.

Key Specifications

Pinout & Package

DO-41 axial-leaded glass package with cathode indicated by a single black band; leads are pure tin plated and solderable per J-STD-002. Device has two terminals: anode and cathode - no internal circuitry or additional pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4734G A0G, the 1N4734A offers identical electrical performance in a non-green-marked variant, while BZX55-C5V6 provides footprint reduction at the cost of 50% lower power rating and degraded regulation stiffness-making 1N4734G A0G preferred for 1 W, low-Z_ZT applications.

Availability

1N4734G A0G is available at Aetrix Electronics and suitable for LED lighting power supplies, industrial sensor references, and on-board DC/DC converter feedback networks requiring stable component supply, full traceability, and long-lifecycle support.

Supply support for 1N4734G A0G 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, computing, and consumer markets since 1979.

The 1N47xxG series is part of TSC's general-purpose Zener diode product line, engineered for high-reliability voltage regulation and reference in cost-sensitive, thermally demanding applications across automotive, industrial, and lighting systems.

FAQ

What is the Zener voltage tolerance of the 1N4734G A0G?

The 1N4734G A0G has a Zener voltage tolerance of ±5% at 5.6 V nominal, verified at 45 mA test current (I_ZT). This tolerance is guaranteed across the full operating temperature range (-65°C to +200°C) and applies to every unit shipped, per Taiwan Semiconductor's G2301 specification revision.

Does the 1N4734G A0G have a cathode marking, and how is it identified?

Yes, the 1N4734G A0G uses a single black cathode band on the glass body to identify the cathode terminal. This marking is visible along the axial length of the DO-41 package and aligns with JEDEC standards for polarity indication in through-hole Zener diodes.

What is the maximum power dissipation of the 1N4734G A0G at 100°C ambient temperature?

At 100°C ambient, the 1N4734G A0G must be derated linearly from its 1 W rating at 25°C. With a 50°C derating start point and 12.5 mW/°C slope (based on R_θJA = 100°C/W), its max power at 100°C ambient is 125 mW - confirmed in Taiwan Semiconductor's Absolute Maximum Ratings table.

Is the 1N4734G A0G RoHS compliant and lead-free?

Yes, the 1N4734G A0G is RoHS compliant and lead-free. Its pure tin-plated leads meet J-STD-002 solderability requirements, and the green compound encapsulant contains no restricted substances per EU Directive 2011/65/EU Annex II.

Can the 1N4734G A0G replace the 1N4734A in existing designs?

Yes, the 1N4734G A0G is electrically and mechanically interchangeable with the 1N4734A - same DO-41 package, identical 5.6 V ±5% Zener voltage, 45 mA I_ZT, and 1 W rating. The only difference is the green compound marking on 1N4734G A0G versus standard matte tin on 1N4734A; no layout or schematic changes are needed.