Taiwan Semiconductor Corporation 1N4734G

Overview

1N4734G from Taiwan Semiconductor is a 1 W, 5.6 V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and reference in low-power DC circuits; features 45 mA test current, 5 Ω dynamic impedance at I_ZT, and 10 µA leakage at 2 V reverse bias.

For engineers reviewing the 1N4734G datasheet, 1N4734G pinout, 1N4734G application, or 1N4734G equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (R_θJA = 100 °C/W), power derating above 50 °C, and cathode-band polarity marking for correct PCB orientation.

Technical Context

The 1N4734G operates as a single-die, silicon planar Zener diode with avalanche breakdown mechanism optimized for stable 5.6 V regulation at 45 mA. Its hermetically sealed glass DO-41 package ensures long-term reliability under thermal cycling and humidity exposure.

It exhibits low dynamic impedance (5 Ω at I_ZT) and tight ±5% V_Z tolerance, enabling use in feedback networks of linear regulators and precision reference circuits where output stability and temperature coefficient matter.

Key Specifications

Pinout & Package

DO-41 axial-leaded glass package with cathode indicated by black band; leads are pure tin plated per J-STD-002 for reliable solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4734A and BZX55-C5V6, the 1N4734G delivers superior thermal performance (R_θJA = 100 °C/W), higher power capability (1 W), and lower dynamic impedance (5 Ω), making it optimal for space-constrained, high-stability voltage reference designs.

Availability

1N4734G is available at Aetrix Electronics and suitable for low-voltage stabilizers, DC/DC converter references, LED driver biasing, and adapter overvoltage clamping requiring stable component supply and RoHS-compliant sourcing.

Supply support for 1N4734G 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, automotive, and consumer markets since 1979.

The 1N47xxG series is part of TSC's standard Zener diode product line engineered for cost-effective, high-reliability voltage regulation in general-purpose power management circuits.

FAQ

What is the nominal Zener voltage and tolerance of the 1N4734G?

The 1N4734G has a nominal Zener voltage of 5.6 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 5.32 V and 5.88 V at 45 mA test current and 25 °C ambient temperature. This tolerance is confirmed in the Electrical Specifications table of the official Taiwan Semiconductor datasheet (Version G2301).

What is the maximum power dissipation rating for the 1N4734G?

The 1N4734G is rated for 1 W maximum power dissipation at case temperature ≤ 50 °C. Above this temperature, power must be linearly derated at 8.33 mW/°C, reaching zero at +170 °C, per the Absolute Maximum Ratings table. This derating curve is critical for thermal design in enclosed or high-ambient environments.

How is polarity identified on the 1N4734G package?

The 1N4734G uses a cathode band - a distinct black ring near one end of the DO-41 glass body - to indicate the cathode terminal. The unmarked end is the anode. This marking aligns with JEDEC DO-41 mechanical standards and ensures correct orientation during PCB assembly and circuit operation.

What is the Zener impedance (Z_ZT) of the 1N4734G and why does it matter?

The 1N4734G has a typical Zener impedance of 5 Ω at I_ZT = 45 mA. This low value means the device maintains tighter output voltage regulation under varying load currents, reducing output ripple in shunt-regulator or reference-divider applications compared to higher-impedance alternatives like the BZX55-C5V6.

Is the 1N4734G RoHS compliant and what does that mean for production use?

Yes, the 1N4734G is RoHS compliant per EU Directive 2011/65/EU, confirmed in the Features section of the Taiwan Semiconductor datasheet. This means it contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits, supporting lead-free reflow soldering and environmental compliance in commercial and industrial electronics manufacturing.