Taiwan Semiconductor Corporation 1N4744G

Overview

1N4744G from Taiwan Semiconductor is a 15 V, ±5% tolerance, 1 W hermetically sealed glass Zener diode in DO-41 package, designed for precision voltage regulation and reference applications in low-power DC/DC converters, lighting circuits, and AC/DC adapters.

For engineers reviewing the 1N4744G datasheet, 1N4744G pinout, 1N4744G application, or 1N4744G equivalent, key selection criteria include its 15 V nominal Zener voltage at 17 mA test current, 14 Ω dynamic impedance, 0.25 mA maximum leakage at 11.4 V, and DO-41 mechanical compatibility with standard through-hole PCB layouts.

Technical Context

The 1N4744G operates as a single-die, silicon planar Zener diode with sharp reverse breakdown characteristics. It maintains stable regulation across -65°C to +200°C junction temperature range and delivers predictable performance under DC bias conditions with specified test current (IZT = 17 mA) and knee current (IZK = 0.25 mA).

Its thermal design supports 100°C/W junction-to-ambient resistance and 53.5°C/W junction-to-lead resistance, enabling reliable operation in compact, non-forced-air environments when mounted on standard copper land patterns per J-STD-002 solderability standards.

Key Specifications

Pinout & Package

DO-41 axial-leaded package with cathode band marking; leads are pure tin plated and solderable per J-STD-002. Device is mechanically polarized - cathode terminal identified by colored band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4744A and BZX55C15, the 1N4744G offers full 1 W power handling, RoHS compliance, and lower dynamic impedance - making it optimal for new industrial and lighting designs requiring robust thermal margin and regulatory alignment.

Availability

1N4744G 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.

Supply support for 1N4744G 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 and analog components for industrial and consumer markets.

The 1N47xxG series was developed to deliver cost-effective, high-reliability Zener diodes with tight tolerances and hermetic sealing for voltage reference and stabilization in power conversion systems.

FAQ

What is the nominal Zener voltage and tolerance of the 1N4744G?

The 1N4744G has a nominal Zener voltage of 15 V with a standard tolerance of ±5%, meaning its actual breakdown voltage falls between 14.25 V and 15.75 V when tested at 17 mA. This tolerance is confirmed in the Electrical Specifications table of the Taiwan Semiconductor datasheet (Version G2301), and applies across the full operating temperature range.

What is the maximum power dissipation rating for the 1N4744G?

The 1N4744G is rated for 1 W maximum DC power dissipation at 25°C ambient temperature. Its thermal performance is characterized by 100°C/W junction-to-ambient resistance, so derating is required above 25°C - e.g., ~0.5 W at 75°C ambient. This rating assumes proper PCB copper land area per DO-41 mounting guidelines.

Does the 1N4744G have RoHS compliance documentation?

Yes, the 1N4744G is explicitly marked RoHS compliant in the official Taiwan Semiconductor datasheet (Version G2301, Page 1). The device uses lead-free terminations and green compound encapsulation, meeting EU Directive 2011/65/EU requirements without exemptions. Full compliance documentation is available upon request from Aetrix Electronics.

What is the Zener impedance of the 1N4744G and why does it matter?

The 1N4744G exhibits 14 Ω typical dynamic impedance (Z_ZT) at 17 mA test current. This value quantifies how much the output voltage varies with changes in current - lower impedance means tighter regulation. In practice, this enables <0.2 V output shift for ±10 mA load transients, critical for stable reference performance in precision analog circuits.

How is polarity indicated on the 1N4744G package?

Polarity on the 1N4744G is indicated by a visible cathode band - a single painted stripe near one end of the DO-41 glass body. The banded end is the cathode, which must be connected to the higher-potential node during Zener operation. This marking is consistent across all 1N47xxG series devices and aligns with JEDEC DO-41 mechanical standards.