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1N4733ATR

1W 5.1V Zener diode, DO-41 package, ±5% tolerance, 7Ω impedance, for voltage regulation and clipping circuits

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Manufacturer Part：

1N4733ATR

Package：

DO-41 (DO-204AL)

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Description

Product Overview

The 1N4733ATR is a 1W Zener diode from onsemi (ON Semiconductor) with a nominal Zener voltage of 5.1V and a tolerance of ±5%. Housed in a DO-41 (DO-204AL) through-hole package, it is designed for voltage regulation and clipping circuits in a wide range of consumer and industrial applications.

Key Specifications

  • Zener Voltage (Nominal): 5.1V (Range: 4.845V ~ 5.355V)
  • Power Dissipation: 1W (at T_L ≤ 50°C)
  • Test Current (I_ZT): 49 mA
  • Zener Impedance (Z_ZT): 7 Ω at I_ZT
  • Zener Impedance (Z_ZK): 550 Ω at I_ZK = 1 mA
  • Reverse Leakage Current: 10 µA at V_R = 1V
  • Max Surge Current (I_ZSM): 890 mA
  • Forward Voltage: 1.2V at I_F = 200 mA
  • Operating Temperature: -65°C ~ +200°C
  • Package: DO-41 (DO-204AL), 2 pins, Through Hole
  • Temperature Coefficient: -0.01%/°C ~ +0.04%/°C

Features

  • ±5% Zener voltage tolerance
  • 1W power dissipation rating
  • MSL 1 (Unlimited) moisture sensitivity
  • Lead-free and RoHS compliant
  • Tape & Reel packaging (TR suffix)
  • Part of the 1N4728A-1N4758A series (3.3V ~ 56V)

Applications

  • Voltage stabilization and regulation
  • Clipping and clamping circuits
  • Overvoltage protection
  • Reference voltage generation
  • Power supply circuits

The 1N4733ATR is a silicon planar power Zener diode from onsemi designed for voltage stabilization and clipping circuits. With a nominal Zener voltage of 5.1V and a power dissipation rating of 1W, this device is part of the industry-standard 1N4728A through 1N4758A series covering Zener voltages from 3.3V to 56V. The device features a ±5% tolerance, low Zener impedance of 7Ω at the test current of 49mA, and a wide operating temperature range from -65°C to +200°C. The TR suffix indicates tape and reel packaging suitable for automated assembly.

The 1N4733ATR operates as a Zener diode in the reverse breakdown region. When the reverse voltage across the diode exceeds the Zener breakdown voltage (5.1V nominal), the diode conducts heavily while maintaining a nearly constant voltage across its terminals. This voltage regulation property arises from the quantum mechanical tunneling effect (Zener effect) and avalanche multiplication in the depletion region. The low dynamic impedance (7Ω at 49mA) ensures minimal voltage variation with changes in current, providing stable reference voltage. In forward bias, the device behaves as a standard silicon diode with approximately 0.7V forward drop.

Pin Name Function
1 Cathode Negative terminal; marked with band on package
2 Anode Positive terminal

The 1N4733ATR is commonly used in power supply circuits where a stable 5.1V reference or clamping voltage is needed. In simple shunt regulators, it maintains a constant output voltage by absorbing excess current when the input voltage fluctuates. It serves as an overvoltage protection device, clamping voltage spikes to 5.1V to protect sensitive downstream components. In clipping circuits, it limits signal amplitude to ±5.1V (when two devices are used back-to-back). The 5.1V Zener voltage is particularly useful as it matches common logic supply voltages, enabling level shifting and protection for 5V logic circuits.

Model Manufacturer Key Difference
1N4733A-TR Vishay 1.3W variant, AEC-Q101 qualified
1N5231BTR onsemi 500mW, SOD-123 package
BZX55C5V1 NXP/WeEn 500mW, DO-35 package
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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