LM336Z-2.5 Precision 2.5V Shunt Regulator Diode

Overview

The LM136-2.5/LM236-2.5 and LM336-2.5 are precision 2.5V shunt regulator diodes designed to provide a stable voltage reference in a wide range of applications. These devices operate as low-temperature-coefficient shunt regulators, offering excellent accuracy and thermal stability. The LM336Z-2.5 is particularly suited for applications requiring a precise voltage reference with minimal drift over temperature variations.

This component is available in various package options, including TO-92 and surface-mount packages, making it versatile for both through-hole and SMD designs. The device is characterized for operation over a wide temperature range, ensuring reliability in harsh environments.

Features

• Precision 2.5V Reference: Tight initial tolerance of ±0.5% (LM336A-2.5) ensures accurate voltage regulation.
• Low Temperature Coefficient: Typically 30 ppm/°C, providing stable performance across temperature variations.
• Wide Operating Current Range: Operates from 400 µA to 10 mA, allowing flexibility in design.
• Low Dynamic Impedance: Typically 0.6 Ω, ensuring minimal voltage fluctuations under load changes.
• Adjustable Output Voltage: Can be fine-tuned using an external resistor for customized applications.
• High Stability Over Time: Excellent long-term stability ensures reliable performance throughout the product lifecycle.
• Available in Multiple Grades: Standard (LM336-2.5) and high-accuracy (LM336A-2.5) versions to meet different precision requirements.

Applications

The LM336Z-2.5 is widely used in applications requiring a stable and precise voltage reference. Key application areas include:

• Voltage Regulation: Used as a shunt regulator in power supplies to maintain a stable output voltage.
• Analog-to-Digital Converters (ADCs): Provides a precise reference voltage for accurate signal conversion.
• Digital-to-Analog Converters (DACs): Ensures consistent voltage levels for high-resolution DACs.
• Test and Measurement Equipment: Serves as a calibration reference in multimeters, oscilloscopes, and other precision instruments.
• Battery Management Systems: Provides a stable reference for monitoring battery voltage levels.
• Industrial Control Systems: Used in feedback loops and sensor conditioning circuits.

Electrical Characteristics

Absolute Maximum Ratings

• Reverse Current (I_R): 15 mA (maximum)
• Power Dissipation (P_D): 400 mW (TO-92 package)
• Operating Temperature Range:
  • LM136-2.5: -55°C to +125°C (Military Grade)
  • LM236-2.5: -25°C to +85°C (Industrial Grade)
  • LM336-2.5: 0°C to +70°C (Commercial Grade)

Typical Electrical Specifications (T_A = 25°C)

• Reference Voltage (V_REF): 2.490V (LM336A-2.5, ±0.5%)
• Temperature Coefficient (TC): 30 ppm/°C (typical)
• Dynamic Impedance (Z_KA): 0.6 Ω (at 1 mA)
• Minimum Operating Current (I_MIN): 400 µA
• Maximum Operating Current (I_MAX): 10 mA

Package Information

TO-92 Package (LM336Z-2.5)

• Package Type: TO-92 (3-pin)
• Pin Configuration:
  • Pin 1: Anode
  • Pin 2: Adjust (No Connection for Fixed 2.5V)
  • Pin 3: Cathode
• Dimensions: 4.95 mm (L) x 3.94 mm (W) x 4.95 mm (H)
• Weight: Approximately 0.35 grams

Surface-Mount Options

• SOT-23 Package: Compact footprint for space-constrained designs.
• SOIC-8 Package: Suitable for automated assembly processes.

Typical Application Circuit

The LM336Z-2.5 is commonly used in a basic shunt regulator configuration. Below is a simplified schematic example:

• A resistor (R_LIMIT) is connected in series with the input voltage (V_IN) to limit the current through the LM336Z-2.5.
• The cathode of the LM336Z-2.5 is connected to the input, and the anode is grounded.
• The output voltage (V_OUT) is taken across the cathode and ground, providing a stable 2.5V reference.

Conclusion

The LM336Z-2.5 is a highly reliable and precise shunt regulator diode, offering excellent performance in voltage reference applications. Its low temperature coefficient, adjustable output, and wide operating range make it a versatile choice for designers in industrial, automotive, and consumer electronics. With multiple package options and robust electrical characteristics, the LM336Z-2.5 is well-suited for both prototyping and high-volume production.