Taiwan Semiconductor Corporation 1N4750A

Overview

1N4750A from Taiwan Semiconductor is a 1 W, 27 V nominal Zener diode in DO-41 package, with ±5% voltage tolerance, 9.5 Ω dynamic impedance at 35 mA test current, and maximum leakage current of 5 μA at 20.6 V reverse bias. It serves as a precision voltage reference and overvoltage clamp in DC power supply regulation circuits.

For engineers reviewing the 1N4750A datasheet, 1N4750A pinout, 1N4750A application, or 1N4750A equivalent, key selection criteria include zener voltage accuracy, thermal stability up to +150°C junction temperature, low dynamic impedance for tight regulation, and AEC-Q101 qualification availability in variant versions.

Technical Context

The 1N4750A operates as a single-die, silicon planar Zener diode with glass-passivated junction, optimized for stable reverse-biased breakdown at 27 V nominal. Its design supports precise DC voltage regulation and transient suppression in linear power supplies and feedback networks.

It exhibits a positive temperature coefficient above ~5 V, with typical TC of +5.5 mV/°C at 27 V, and maintains ≤5 μA leakage at 80% of V_Z (20.6 V) across -55°C to +150°C operating range. Derating begins at 50°C at 6.67 mW/°C on 5 mm × 5 mm Cu pad.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial leaded, glass-passivated, cathode indicated by band. Weight ≈ 0.300 g. RoHS and halogen-free compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4750A, the TB variant offers identical performance in automated assembly but lacks automotive qualification evidence, while MMBZ5250BS trades power handling and regulation precision for miniaturization-making it unsuitable as a drop-in replacement in 1 W shunt regulator designs.

Availability

1N4750A is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and feedback network reference applications requiring stable component supply, consistent parametric performance, and long-term sourcing continuity.

Supply support for 1N4750A 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 protection components for industrial and automotive markets.

The 1N47xxA series was designed specifically for high-reliability, cost-effective Zener regulation in linear power supplies and protection circuits-emphasizing tight voltage tolerance, thermal stability, and robust surge capability.

FAQ

What is the nominal Zener voltage and tolerance of the 1N4750A?

The 1N4750A has a nominal Zener voltage of 27 V with a standard tolerance of ±5%, meaning its guaranteed breakdown voltage range is 25.65 V to 28.35 V when tested at 35 mA. This tolerance is defined per JEDEC registration and applies across the full operating temperature range of -55°C to +150°C. The 1N4750A achieves this specification using a glass-passivated silicon junction and tight process control.

Does the 1N4750A have AEC-Q101 qualification?

The base 1N4750A part is not AEC-Q101 qualified; however, Taiwan Semiconductor offers an AEC-Q101-qualified version designated as 1N4750AH (or 1N4750AHA0G for ammo box packaging). This variant undergoes additional stress testing per AEC-Q101 standards and is marked with an "H" suffix. The 1N4750A itself meets all electrical and mechanical specifications but lacks formal automotive qualification documentation.

What is the maximum surge current rating for the 1N4750A?

The 1N4750A is rated for a non-repetitive peak surge current of 170 A, measured as a 1/120 second (≈8.3 ms) half-sine or equivalent rectangular pulse, per JEDEC standards. This rating assumes proper PCB layout with adequate copper area for heat dissipation. The 1N4750A's ability to absorb this energy without failure makes it suitable for load-dump and inductive-switching transient suppression in 24 V systems.

How does the 1N4750A's Zener impedance affect regulation performance?

The 1N4750A exhibits a dynamic impedance (Z_ZT) of 9.5 Ω at its 35 mA test current, which directly determines how tightly it maintains output voltage under varying load conditions. Lower Z_ZT means less voltage deviation per mA of current change-enabling stable 27 V regulation even with ±10 mA load shifts. This value is confirmed in Taiwan Semiconductor's official datasheet revision O2104 and is significantly lower than many 27 V Zeners in the same power class.

What is the recommended PCB mounting condition for full 1 W power dissipation?

To sustain full 1 W power dissipation at ambient temperatures up to 50°C, the 1N4750A must be mounted on a 5 mm × 5 mm copper pad, as specified in the absolute maximum ratings table. Derating begins at 6.67 mW/°C above 50°C under this condition. Smaller pads or poor thermal vias will reduce safe operating power and risk exceeding the 150°C maximum junction temperature-potentially degrading long-term reliability of the 1N4750A.