Texas Instruments LM385M3X-2.5/NOPB

Mfr. Part

LM385M3X-2.5/NOPB

Manufacturer

Texas Instruments (formerly Luminary Micro)

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Detailed Description

2.5 V fixed shunt voltage reference

3% initial accuracy, temperature-compensated

SOT‑23-3 surface-mount package, commercial temperature range (0°C to 70°C)

Low-current operation, supports up to 20 mA shunt current

RoHS3 compliant and Pb‑Free (NOPB)

Key Features

Reference voltage: 2.5 V fixed

Accuracy: ±3%

Reference type: Shunt (two-terminal reference)

Operating current: supports microamp-level bias up to 20 mA (typical operating range)

Temperature coefficient: 150 ppm/°C (typical)

Package: SOT‑23‑3 (TO‑236‑3, SC‑59)

Mounting: Surface mount

RoHS3 compliant, Pb‑free finish (NOPB suffix)

Key Advantages

Simple to use: just add a series resistor

Small footprint for dense PCBs (SOT‑23)

Low power draw for battery-powered designs

Stable reference over temperature for better measurement accuracy

Widely supported and proven device family (LM385 series)

Packaging

Delivery type: Tape & Reel (TR) for automated assembly

Package/case: SOT‑23‑3 (also known as TO‑236‑3, SC‑59)

Body material: Molded epoxy, JEDEC standard SOT‑23

Lead finish: Pb‑free matte tin (NOPB)

Typical SOT‑23 size: about 2.9 mm × 1.3 mm × 1.1 mm (for guidance only; see datasheet for exact dimensions)

Pin configuration (shunt reference):

• Anode

• Cathode

• Third pin not internally connected (NC) in this SOT‑23 variant

Tape format: 8 mm carrier tape per EIA‑481 (common for SOT‑23; confirm on datasheet)

Thermal characteristics: Low-power device; junction-to-ambient depends on PCB (SOT‑23 is typically high θJA). Use datasheet and your PCB conditions for thermal design and derating.

Electrical properties summary:

• Vref: 2.5 V fixed

• Initial tolerance: ±3%

• Tempco: 150 ppm/°C (typ)

• Shunt operating current: microamps to tens of milliamps; up to 20 mA output current capability noted

• Noise (10 Hz to 10 kHz): consult datasheet for exact value. If a “120 Vrms” figure is seen in third‑party listings, that is almost certainly a unit/typing error; noise is typically in microvolts rms for this class of reference.

Lifecycle

Status: Active, mainstream device at Texas Instruments

Not near discontinuation based on current industry status

Equivalent or alternative models (check pinout and specs before drop‑in use):

• TI LM385-2.5 family variants (other tolerances/grades and packages)

• TI LM285-2.5 (similar reference family)

• TI LM336-2.5 (shunt reference, 2.5 V)

• TI LM4040A25 (series reference, 2.5 V; different topology)

• TI LM4050A25 (series reference, 2.5 V; low noise)

• TI TLV431 / TL431 (adjustable shunt, 2.495 V reference; not fixed 2.5 V)

• Microchip MCP1525 (series reference, 2.5 V; different topology)

• Onsemi NCP431 / AZ431 (adjustable shunt; different use)

If you need exact form‑fit‑function alternatives or cross‑brand options, please contact Y‑IC via our website for a detailed, up‑to‑date list.

Key Application Areas

Precision reference for ADCs, DACs, and comparators

Stable threshold setting and voltage monitoring

Low‑power measurement and instrumentation

Battery‑powered and portable devices

Power supplies and regulators needing a fixed 2.5 V reference

Op‑amp circuits, references for sensor interfaces

Datasheet

Y‑IC provides the most authoritative datasheet for LM385M3X-2.5/NOPB on our product page. We recommend downloading the datasheet from our website now for complete specifications, pinouts, and layout guidance.

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