9842

Technical Summary: 9842 Low-Power Voltage Regulator Diodes

Overview

The 9842 series comprises low-power voltage regulator diodes housed in hermetically sealed leaded glass SOD27 (DO-35) packages. These diodes are designed to provide stable voltage regulation in a wide range of electronic circuits. The series includes 37 distinct types, covering nominal working voltages from 2.4 V to 75 V, conforming to the normalized E24 ±5% tolerance range. These components are identified by part numbers ranging from BZX55-C2V4 to BZX55-C75, making them suitable for precision applications requiring reliable voltage references.

Features

• Total Power Dissipation: Optimized for low-power applications, ensuring efficient performance without excessive heat generation.
• Hermetically Sealed Package: The SOD27 (DO-35) leaded glass package provides robust protection against environmental factors such as moisture and contaminants.
• Wide Voltage Range: Available in 37 voltage options from 2.4 V to 75 V, catering to diverse circuit requirements.
• E24 ±5% Tolerance: Ensures precise voltage regulation, critical for applications demanding high accuracy.
• Compact Form Factor: The SOD27 package is space-efficient, making it ideal for densely populated PCBs.
• Reliable Performance: Designed for long-term stability and durability in various operating conditions.

Applications

The 9842 series voltage regulator diodes are versatile components suitable for a broad spectrum of applications, including:

• Voltage Regulation: Used as shunt regulators to maintain a constant voltage level in power supplies and voltage reference circuits.
• Signal Clipping and Clamping: Employed in waveform shaping circuits to limit or shift signal voltages.
• Overvoltage Protection: Safeguards sensitive electronic components by clamping excessive voltages.
• Precision Instrumentation: Provides stable voltage references in measurement and calibration equipment.
• Consumer Electronics: Integrated into devices such as televisions, audio equipment, and mobile chargers for reliable voltage control.
• Automotive Systems: Used in vehicle electronics for voltage stabilization and protection against transients.

Electrical Characteristics

The following table summarizes the key electrical properties of the 9842 series diodes. All values are typical unless otherwise specified.

• Nominal Working Voltage (Vz): Ranges from 2.4 V to 75 V, in increments conforming to the E24 series.
• Tolerance: ±5% across all voltage ratings.
• Maximum Power Dissipation (Ptot): Typically 500 mW at 25°C ambient temperature.
• Operating Temperature Range: -65°C to +175°C, ensuring performance under extreme conditions.
• Forward Voltage (VF): Approximately 1.2 V at a forward current of 200 mA.
• Dynamic Resistance (Zzt): Varies with voltage rating; lower voltages exhibit higher dynamic resistance.
• Leakage Current (IR): Typically less than 5 µA at the rated working voltage.

Package Information

The 9842 series diodes are encapsulated in SOD27 (DO-35) packages, which are industry-standard for low-power diodes. The package details are as follows:

• Package Type: SOD27 (DO-35), hermetically sealed leaded glass.
• Dimensions: Approximate body length of 4.1 mm and diameter of 2.0 mm.
• Lead Material: Tinned copper for excellent solderability and conductivity.
• Lead Length: Standard 25.4 mm (1 inch) leads, suitable for through-hole mounting.
• Weight: Approximately 0.13 grams per unit.
• Marking: Each diode is marked with its part number (e.g., BZX55-C2V4) for easy identification.

Simplified Outline and Symbol

The SOD27 (DO-35) package features a cylindrical glass body with axial leads. The simplified outline and electrical symbol are as follows:

• Outline: Cylindrical glass encapsulation with two axial leads extending from opposite ends.
• Symbol: Standard Zener diode symbol, comprising a cathode bar and an anode arrow with a reverse-bias breakdown indicator.

Reliability and Compliance

The 9842 series diodes are manufactured to meet stringent quality and reliability standards. Key compliance and reliability features include:

• RoHS Compliance: Free from hazardous substances, adhering to environmental regulations.
• ESD Protection: Robust against electrostatic discharge, enhancing durability during handling and operation.
• Hermetic Sealing: Prevents ingress of moisture and contaminants, ensuring long-term reliability.
• Industry Standards: Conforms to relevant JEDEC and MIL-STD specifications for component reliability.

Conclusion

The 9842 series low-power voltage regulator diodes offer a reliable and precise solution for voltage regulation and protection in a wide array of electronic applications. With their hermetically sealed SOD27 packages, broad voltage range, and tight tolerance, these diodes are well-suited for both consumer and industrial applications. Their compact form factor and robust construction make them an excellent choice for designers seeking dependable performance in space-constrained environments.