PH4733A 5.1V 1 Watt Zener Diode DO-41

1N4733A 5.1V 1 Watt Zener Diode DO-41 is a high-quality silicon planar power Zener diode designed for precise voltage regulation and transient protection in electronic circuits. This component operates by maintaining a constant 5.1V output across its terminals once the reverse bias voltage reaches the Zener breakdown point. Consequently, it provides an effective stable reference voltage for power supplies and control systems. The 1N4733A handles a power dissipation of up to 1 Watt, which allows it to manage higher current loads than standard low-power signal diodes. Therefore, you can reliably use this diode to protect sensitive logic gates and microcontrollers from overvoltage conditions while ensuring consistent circuit performance.

Key Features:

• High Power Rating: The device features a 1.0 Watt power dissipation capability, making it suitable for medium-power regulation tasks.
• Tight Voltage Tolerance: It offers a standard ±5% tolerance on the nominal Zener voltage to ensure predictable circuit behavior.
• Low Zener Impedance: This diode exhibits low dynamic impedance, which results in excellent regulation characteristics and a sharp breakdown knee.
• DO-41 Package: The rugged, hermetically sealed axial lead package provides durability and easy through-hole mounting on PCBs.
• Silicon Planar Construction: The advanced planar structure ensures high reliability and stable electrical parameters over long-term operation.

Technical Specifications:

• Nominal Zener Voltage (V_Z): 5.1 V
• Power Dissipation (P_D): 1.0 Watt
• Maximum Zener Current (I_ZM): 178 mA
• Test Current (I_ZT): 49 mA
• Maximum Reverse Leakage Current (I_R): 10 μA at V_R = 1.0 V
• Forward Voltage Drop (V_F): ≤ 1.2 V at I_F = 200 mA
• Operating Junction Temperature: −65°C to +200°C

Mechanical Specifications:

• Case Type: DO-204AL (DO-41) Glass or Molded Plastic
• Polarity: Color band denotes the Cathode end.
• Mounting Position: Any (Axial Lead)
• Lead Material: Solderable tinned copper leads

Dimensions:

• Body Length: ≈ 5.2 mm
• Body Diameter: ≈ 2.7 mm
• Lead Diameter: ≈ 0.8 mm
• Total Length (Including Leads): ≈ 58 mm

Pinout and Wiring:

• Cathode (Identified by Band): Connect this side to the positive side of the circuit in a reverse-bias configuration for voltage regulation.
• Anode: Connect this side to the negative supply or ground.
• Wiring Tip: Furthermore, always install a series current-limiting resistor to prevent the diode from exceeding its maximum 1 Watt power rating.

Datasheet Reference:

• Download 1N4733A Zener Diode Datasheet

Commonly Used in:

• Voltage Reference Circuits: Providing a steady 5.1V reference for analog-to-digital converters and operational amplifiers.
• Switching Power Supplies: Regulating output stages to ensure consistent voltage delivery to the load.
• Clamping Circuits: Limiting voltage spikes in signal lines to protect integrated circuits.

Applications:

• Overvoltage Protection: Acting as a “shunt” to ground when the input voltage exceeds 5.1V.
• Logic Level Shifting: Adjusting signal levels to match 5V logic requirements in mixed-voltage systems.
• Battery Charging Circuits: Preventing overcharge conditions by clipping the charging voltage at a safe threshold.

Equivalent Models:

• BZX85C5V1: A functionally identical 1.3 Watt Zener diode that offers slightly higher power handling.
• 1N5231B: A common 500mW alternative for lower current applications where 1 Watt is not required.
• MMSZ5231: The surface-mount (SMD) equivalent for compact modern PCB designs.

Package Includes:

• 1 x 1N4733A 5.1V 1 Watt Zener Diode DO-41