9843 Low-Power Voltage Regulator Diodes

Overview

The 9843 series comprises low-power voltage regulator diodes housed in hermetically sealed leaded glass SOD27 (DO-35) packages. These diodes are designed for precision voltage regulation in a variety of electronic circuits. The series is available in multiple tolerance ranges, including ±1% (BZX79-A), ±2% (BZX79-B), ±3% (BZX79-F), and ±5% (BZX79-C), making them suitable for applications requiring tight voltage control. With 37 nominal working voltage options, the 9843 series provides flexibility for designers across industries.

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 excellent environmental protection, enhancing reliability in harsh conditions.
• Precision Tolerance Options: Available in ±1%, ±2%, ±3%, and ±5% tolerance ranges to meet diverse design requirements.
• Wide Voltage Range: The series includes 37 nominal working voltages, catering to a broad spectrum of applications.
• Low Leakage Current: Ensures minimal power loss and improved efficiency in regulated circuits.
• Stable Performance: Designed for consistent voltage regulation over a wide temperature range.

Applications

The 9843 series is versatile and finds use in numerous electronic applications, including:

• Voltage Regulation: Ideal for stabilizing voltage in power supplies and reference circuits.
• Signal Conditioning: Used in analog and digital circuits to maintain signal integrity.
• Consumer Electronics: Commonly employed in devices such as televisions, audio equipment, and mobile chargers.
• Industrial Controls: Suitable for automation systems, sensors, and control modules requiring precise voltage levels.
• Telecommunications: Ensures stable voltage in communication devices and network infrastructure.
• Automotive Electronics: Used in dashboard displays, infotainment systems, and engine control units.

Electrical Characteristics

Absolute Maximum Ratings

• Total Power Dissipation: 500 mW (at 25°C ambient temperature)
• Forward Voltage: 1.2 V (maximum at 200 mA)
• Reverse Current: 5 µA (maximum at working voltage)
• Operating Temperature Range: -65°C to +175°C

Typical Electrical Parameters

• Nominal Working Voltage Range: 2.4 V to 75 V (37 options available)
• Dynamic Resistance: 20 Ω (typical at 5 mA for 5.1 V variant)
• Temperature Coefficient: ±0.05%/°C (for BZX79-A ±1% tolerance variant)

Package Information

SOD27 (DO-35) Package Dimensions

• Body Diameter: 1.8 mm (max)
• Body Length: 3.8 mm (max)
• Lead Diameter: 0.45 mm (nominal)
• Lead Length: 25 mm (standard)

Mechanical Characteristics

• Material: Hermetically sealed leaded glass
• Weight: Approximately 0.1 g
• Mounting Style: Through-hole
• Termination: Axial leads for easy PCB mounting

Ordering Information

The 9843 series is available in various part numbers corresponding to voltage and tolerance specifications. Below is an example of the naming convention:

• BZX79-A2V4: 2.4 V nominal voltage, ±1% tolerance
• BZX79-B5V1: 5.1 V nominal voltage, ±2% tolerance
• BZX79-F12: 12 V nominal voltage, ±3% tolerance
• BZX79-C75: 75 V nominal voltage, ±5% tolerance

Reliability and Compliance

The 9843 series adheres to industry standards for reliability and performance. Key compliance and testing include:

• ESD Protection: Meets MIL-STD-883 Method 3015 for electrostatic discharge tolerance.
• Environmental Testing: Qualified for moisture resistance (MIL-STD-202 Method 106) and thermal shock (MIL-STD-202 Method 107).
• RoHS Compliance: Conforms to Restriction of Hazardous Substances directives, ensuring environmentally friendly manufacturing.

Conclusion

The 9843 series of low-power voltage regulator diodes offers a reliable and precise solution for voltage regulation in a wide range of electronic applications. With its hermetically sealed SOD27 (DO-35) package, multiple tolerance options, and broad voltage range, this series is well-suited for both consumer and industrial applications. Engineers can leverage its robust electrical characteristics and compact form factor to design efficient and stable circuits.