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LM285D-2-5

Name: LM285D-2-5
Rating: 4.7 (12 reviews)

IC VREF SHUNT 1.5% 8SOIC

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製造商。部分 #LM285D-2-5
包 SOIC (D)-8
資料表 LM285D-2-5 DataSheet
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規格

Package	Tube
ProductStatus	Active
ReferenceType	Shunt
OutputType	Fixed
Voltage-Output(Min/Fixed)	2.5V
Current-Output	20 mA
Tolerance	±1.5%
TemperatureCoefficient	20ppm/°C Typical
Noise-10Hzto10kHz	120µVrms
Current-Cathode	20 µA
OperatingTemperature	-40°C ~ 85°C (TA)
MountingType	Surface Mount
Package/Case	8-SOIC (0.154, 3.90mm Width)

概述

Description

LM285D-2.5 is a fixed 2.5‑V shunt voltage reference in the LM285 family (National Semiconductor/TI). It behaves like a precision reference that clamps the output near 2.5 V when biased with the proper current.
Key points
- Two‑terminal device: cathode to the supply (through a resistor), anode to ground.
- Provides a stable 2.5 V reference with low dynamic impedance and good temperature stability.
- Bias current is set externally (typically from a few tens of microamps to a few milliamps, depending on the variant and design).
- Useful as a reference for ADC/DACs, precision regulators, calibration sources, and instrumentation.
How to use
- Connect anode to ground; connect cathode to V+ through a current‑setting resistor.
- Keep the current within the part’s recommended window.
- Add a bypass capacitor if you need reduced output noise.
Notes
- The D and 2.5 in the name denote the variant and output voltage; check the datasheet for exact specs, tolerances, and packaging (e.g., TO‑92, SOT‑23).

Features

LM285D-2-5 features:
- Fixed 2.5 V voltage reference
- Tight initial accuracy
- Low temperature coefficient (low drift)
- Low noise for precision analog references
- Low dynamic impedance with good line and load regulation
- Low quiescent current (micropower operation)
- Suitable for precision references in ADC/DAC and similar circuits
- Wide operating temperature range
- Available in common packages (TO-92, SOT-23) for easy PCB integration

Package

TO-92 three-lead through-hole package.

Pinout

3 pins. It is a fixed 2.5 V shunt voltage reference (LM285D-2-5). Typical TO-92 pinout: Pin 1 = Ground (reference), Pin 2 = Vout, Pin 3 = Not Connected (NC).

Manufacturer

- Manufacturer: Texas Instruments (TI).
- What kind of company: An American multinational semiconductor company that designs and manufactures analog and digital integrated circuits (it acquired National Semiconductor).

Application

LM285D-2-5 is a precision 2.5 V voltage reference. Typical application areas:
- Precision reference for ADC/DAC in instrumentation and data acquisition
- Stable reference for voltage regulators and power-supply monitoring
- Calibration source for DMMs, voltmeters, and sensor conditioning
- Suitable for portable/battery-powered instruments (low noise/drift)
- Temperature-stable reference for medical and test equipment
- Front-end reference for precision op-amps and ADC drivers

Equivalent

LM285D-2-5 is a 2.5 V shunt voltage reference. Common equivalents include:
- LM385-2.5 (National/TI)
- TL431 (2.495 V reference; can substitute with resistor network)
- REF5025 (Analog Devices)
- ADR4525/ADR4525A (Analog Devices)
- LT6655-2.5 (Linear Technology)
Note: packaging and tolerance vary; verify datasheets and cross-reference for exact specs before swapping.