LM285MX-2.5/NOPB
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| Part Number | LM285MX-2.5/NOPB |
|---|---|
| Manufacturer |
 Texas Instruments
|
| Description | The LM285MX-2.5/NOPB is a precision, micropower 2.5V shunt voltage reference from Texas Instruments. Designed for applications requiring a stable and accurate reference voltage with very low operating current, the device combines bandgap reference technology, low dynamic impedance, and good temperature stability in a compact SOIC-8 surface-mount package. The LM285MX-2.5/NOPB belongs to the LM285-2.5-N micropower voltage reference family. It operates as a two-terminal shunt reference, maintaining a nominal 2.5V reference voltage when biased with an appropriate reverse current. This operating principle is similar to that of a precision Zener diode but provides improved voltage stability and low-current performance. The device provides a fixed nominal output voltage of 2.5V with an initial voltage tolerance of ±1.5% for the standard LM285MX-2.5/NOPB ordering version. This accuracy makes it suitable for general-purpose precision reference applications, analog signal conditioning, and measurement circuitry. A major advantage of the LM285MX-2.5/NOPB is its extremely low operating current requirement. The reference can operate with a reverse bias current as low as 20µA, making it particularly useful in battery-powered electronics, portable instrumentation, and other systems where minimizing power consumption is important. The specified operating current range extends from 20µA to 20mA. This wide current range provides flexibility when designing shunt reference circuits with different supply voltages, load requirements, and power-consumption constraints. The LM285MX-2.5/NOPB uses a temperature-compensated bandgap reference architecture to provide stable voltage characteristics over changing operating temperatures. The device has a maximum specified temperature coefficient of approximately 150ppm/°C, helping minimize reference voltage variation in industrial and embedded electronic systems. The reference also provides low dynamic impedance, allowing its output voltage to remain relatively stable as the reverse operating current changes. Low dynamic impedance is particularly important in shunt reference applications where supply voltage variations or changing circuit loads can affect the current flowing through the reference device. The LM285-2.5-N family provides a maximum dynamic impedance of approximately 1.5Ω over the specified temperature range under the applicable test conditions. This characteristic contributes to good reference voltage regulation and predictable performance in practical circuit implementations. The device features low output noise, with a typical noise voltage of approximately 120µVRMS over a frequency range of 10Hz to 10kHz. This makes the LM285MX-2.5/NOPB suitable for many analog measurement and signal-conditioning applications where reference noise must be controlled. As a two-terminal shunt voltage reference, the LM285MX-2.5/NOPB is typically connected in reverse bias with an external current-limiting resistor. The resistor establishes the operating current through the reference and must be selected to maintain the specified current range across the expected supply voltage and load conditions. Unlike a series voltage regulator, a shunt reference maintains its nominal voltage by conducting current through a parallel path. The circuit designer must ensure that sufficient current remains available for reference regulation while avoiding excessive current and power dissipation under maximum supply voltage conditions. The device is particularly useful as a stable voltage reference for analog-to-digital converters (ADCs). A stable 2.5V reference can improve the consistency of analog measurements by providing a predictable voltage against which input signals are converted into digital values. The LM285MX-2.5/NOPB can also be used with digital-to-analog converters (DACs), analog comparators, operational amplifiers, and other precision analog circuitry requiring a stable reference voltage. Its low operating current makes it attractive for compact embedded designs with limited power budgets. In sensor interface applications, the device can provide a stable reference for temperature sensors, pressure sensors, current measurement circuits, voltage monitoring systems, and analog signal-conditioning stages. A predictable reference voltage helps reduce measurement errors caused by variations in the system supply voltage. The LM285MX-2.5/NOPB is also suitable for battery monitoring and threshold detection circuits. When combined with an external comparator or operational amplifier, the 2.5V reference can establish accurate switching thresholds for undervoltage detection, overvoltage monitoring, and other supervisory functions. Because the reference operates at very low current, it can be used in low-power standby circuits where maintaining a stable voltage reference without significantly increasing battery drain is important. This characteristic is useful in portable instrumentation, remote monitoring equipment, and battery-operated control systems. The LM285MX-2.5/NOPB is specified for an operating ambient temperature range of -40°C to +85°C. This industrial temperature range supports reliable operation in measurement equipment, industrial controllers, power management circuits, and general-purpose embedded electronics. The device is supplied in an 8-pin SOIC surface-mount package, identified by Texas Instruments package code D. The package has a nominal body width of 3.90mm and occupies approximately 4.90 × 6.00mm of PCB area, making it compatible with standard automated SMT assembly processes. Although the package contains eight physical pins, the LM285MX-2.5/NOPB functions electrically as a two-terminal reference diode. Designers should follow the manufacturer's pin configuration and PCB layout recommendations, including the correct treatment of unused package terminals. The MX ordering designation identifies the SOIC package supplied in tape-and-reel format. The standard manufacturer package quantity is 2500 devices per reel, making the component suitable for automated pick-and-place assembly and high-volume electronics manufacturing. The /NOPB suffix identifies the lead-free ordering version. The LM285MX-2.5/NOPB is RoHS and REACH compliant and uses a lead-free tin terminal finish. The device has a moisture sensitivity classification of MSL 1 with a maximum specified peak reflow temperature of 260°C. The combination of fixed 2.5V reference voltage, ±1.5% initial accuracy, 20µA minimum operating current, 20mA maximum reference current, 150ppm/°C maximum temperature coefficient, low dynamic impedance, low noise, -40°C to +85°C operation, and compact SOIC-8 packaging makes the LM285MX-2.5/NOPB a practical solution for low-power precision voltage reference applications. The LM285MX-2.5/NOPB is widely used in ADC and DAC reference circuits, precision analog electronics, sensor interfaces, data acquisition systems, industrial instrumentation, battery-powered equipment, portable measurement devices, voltage monitoring circuits, power supply reference circuits, comparator threshold generation, analog signal conditioning, embedded controllers, low-power monitoring systems, industrial automation, test and measurement equipment, and general-purpose precision voltage reference applications. |
| Product Group | Voltage Regulator |
| MOQ | 2500 pcs |
| SPQ | 2500 pcs |
| Figure/Case | SOIC-8 |
| Package | T&R Pack |
 PDF Datasheet | |
| Ship From | Hong Kong |
| Shipment Way | DHL / Fedex / TNT / UPS / Others |
| Delivery Term | Ex-Works |
| Send RFQ | sales@signalhk.com |
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LM285MX-2.5/NOPB
LM285MX-2.5/NOPB