Taiwan Semiconductor Corporation 1N4756G

Overview

1N4756G from Taiwan Semiconductor is a 1 W, 47 V ±5% Zener diode in DO-41 glass package, designed for precision voltage regulation and reference applications with 80 Ω dynamic impedance at 5.5 mA test current and 35.8 V minimum knee voltage. It operates across -65°C to +200°C junction temperature range and serves in DC/DC converter feedback loops, LED driver references, and low-power adapter stabilization circuits.

For engineers reviewing the 1N4756G datasheet, 1N4756G pinout, 1N4756G application, or 1N4756G equivalent, key selection criteria include its verified 47 V nominal Zener voltage, ±5% tolerance, 1 W power rating, DO-41 mechanical compatibility, and thermal resistance (R_θJA = 100°C/W) under standard PCB mounting conditions.

Technical Context

The 1N4756G functions as a single-die, hermetically sealed silicon Zener diode optimized for stable reverse-biased breakdown operation. Its electrical behavior is defined by a nominal Zener voltage of 47 V at 5.5 mA (I_ZT), with maximum Zener impedance of 80 Ω at that current and 1500 Ω at 0.25 mA (I_ZK).

It exhibits a minimum knee voltage of 35.8 V at I_ZK = 0.25 mA and maximum leakage current of 5 µA at 35.8 V (V_R). Thermal performance is characterized by R_θJL = 53.5°C/W and R_θJA = 100°C/W, supporting reliable operation in compact, non-heatsinked layouts.

Key Specifications

Pinout & Package

Package: DO-41 glass axial lead package with cathode band marking; pure tin-plated leads compliant with J-STD-002 solderability; weight ≈ 242 mg.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4756G, the 1N4756A offers slightly better thermal performance on standard layouts, while BZX85C47 trades lower leakage for higher surge capability-making 1N4756G optimal for precision reference use where stability at 5.5 mA is critical.

Availability

1N4756G is available at Aetrix Electronics and suitable for LED driver references, DC/DC converter feedback networks, and low-voltage adapter clamp circuits requiring stable component supply with full traceability and RoHS compliance.

Supply support for 1N4756G 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 industrial, computing, and consumer markets since 1979.

The 1N47xxG series was developed to deliver cost-effective, high-reliability Zener references with hermetic glass packaging and tight tolerances for power management subsystems in space-constrained applications.

FAQ

What is the nominal Zener voltage and tolerance of the 1N4756G?

The 1N4756G has a nominal Zener voltage of 47 V with a standard tolerance of ±5%, measured at a test current of 5.5 mA. This tolerance is confirmed in the Electrical Specifications table of the Taiwan Semiconductor datasheet (Version G2301), ensuring consistent voltage regulation across production units without binning or calibration.

What is the maximum power dissipation rating for the 1N4756G?

The 1N4756G is rated for 1 W maximum continuous power dissipation at 25°C ambient temperature. Derating is required above 25°C per the thermal resistance specification (R_θJA = 100°C/W), with full derating to zero power at +125°C case temperature under standard PCB mounting conditions.

Does the 1N4756G have a specified minimum knee voltage, and what is its value?

Yes, the 1N4756G specifies a minimum knee voltage of 35.8 V at I_ZK = 0.25 mA. This value defines the lowest voltage at which the diode begins to conduct significantly in reverse bias, enabling predictable turn-on behavior in low-current protection and reference applications.

What package type and lead finish does the 1N4756G use?

The 1N4756G uses the DO-41 axial glass package with pure tin-plated leads, certified solderable per J-STD-002. The cathode is marked by a visible band, and the device weighs approximately 242 mg-fully documented in the Mechanical Data section of the official Taiwan Semiconductor datasheet.

How does the Zener impedance of the 1N4756G affect its regulation performance?

The 1N4756G exhibits a maximum Zener impedance of 80 Ω at 5.5 mA (I_ZT) and 1500 Ω at 0.25 mA (I_ZK). This low dynamic impedance ensures minimal output voltage variation under changing load currents, making it suitable for precision reference applications where regulation stability is critical.