Overview
The LM385Z-2.5/LFT2, produced by Texas Instruments, is a micropower voltage reference diode designed for applications requiring precision performance with low power consumption. This device is part of the LM185-2.5, LM285-2.5, and LM385-2.5 series, each with different operating temperature ranges. The LM385Z-2.5/LFT2 is specifically rated for operation between 0°C and 70°C, making it suitable for a wide range of applications where stable voltage reference is crucial.
Key Specifications
| Parameter | Conditions | Min | Max | Units | |
|---|---|---|---|---|---|
| Reverse Breakdown Voltage | TA = 25°C, 20 μA ≤ IR ≤ 20 mA | 2.425 | 2.500 | 2.575 | V |
| Minimum Operating Current | TMIN ≤ TA ≤ TMAX | 20 | - | - | μA |
| Reverse Dynamic Impedance | IR = 100 μA | 0.2 | 0.6 | 1.0 | Ω |
| Average Temperature Coefficient | 20 μA ≤ IR ≤ 20 mA | 20 | - | - | ppm/°C |
| Wide Band Noise (RMS) | 10 Hz ≤ f ≤ 10 kHz, IR = 100 μA | 120 | - | - | μV |
| Operating Temperature Range | - | 0°C | - | 70°C | °C |
| Storage Temperature Range | - | -65°C | - | 150°C | °C |
Key Features
- Micropower Operation: Guaranteed operation specifications at currents as low as 20 μA and up to 20 mA.
- Precision Voltage Reference: Nominal voltage of 2.5V with initial voltage tolerance of ±1% or ±2%.
- Low Dynamic Impedance: Maximum dynamic impedance of 1 Ω.
- Low Noise and Stability: Excellent stability over time and temperature, with low wideband noise (120 μV RMS from 10 Hz to 10 kHz).
- Wide Operating Temperature Range: Rated for operation between 0°C and 70°C.
- Low Power Consumption: Suitable for battery-operated systems and portable devices.
- Multiple Package Options: Available in TO-92, SOIC, and SOT-23 packages.
Applications
- Portable Meter References: Ideal for use in portable meters and test instruments.
- Portable Test Instruments: Suitable for battery-operated test equipment.
- Battery-Operated Systems: Used in systems where low power consumption is critical.
- Panel Meters: Provides a stable voltage reference for panel meters.
- Current Loop Instrumentation: Used in current loop applications requiring precise voltage references.
Q & A
- What is the nominal voltage of the LM385Z-2.5/LFT2?
The nominal voltage is 2.5V.
- What is the operating current range of the LM385Z-2.5/LFT2?
The device operates with currents between 20 μA and 20 mA.
- What are the available initial voltage tolerances for the LM385Z-2.5/LFT2?
The device is available with initial voltage tolerances of ±1% or ±2%.
- What is the maximum dynamic impedance of the LM385Z-2.5/LFT2?
The maximum dynamic impedance is 1 Ω.
- What is the operating temperature range of the LM385Z-2.5/LFT2?
The device is rated for operation between 0°C and 70°C.
- What are the typical applications of the LM385Z-2.5/LFT2?
Typical applications include portable meters, portable test instruments, battery-operated systems, panel meters, and current loop instrumentation.
- What is the storage temperature range for the LM385Z-2.5/LFT2?
The storage temperature range is from -65°C to 150°C.
- What are the available package options for the LM385Z-2.5/LFT2?
The device is available in TO-92, SOIC, and SOT-23 packages.
- How does the LM385Z-2.5/LFT2 handle capacitive loading?
The device is exceptionally tolerant of capacitive loading, making it easy to use in almost any reference application.
- What is the wideband noise specification of the LM385Z-2.5/LFT2?
The wideband noise is 120 μV RMS from 10 Hz to 10 kHz.
