Texas Instruments LM385M3-1.2/NOPB

Mfr. Part

LM385M3-1.2/NOPB

Manufacturer

Luminary Micro/Texas Instruments

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Detailed Description

Fixed 1.235 V shunt voltage reference in SOT-23-3. ROHS3 compliant. Surface-mount. Operating temperature 0°C to 70°C (TA). Base product family LM385. Supplied in Tape & Reel (TR). Suitable for precision biasing, reference rails, and low-power designs. In-stock quantity reference: 19,100 units (subject to change).

Key Features

Reference type: Shunt, two-terminal operation

Fixed output voltage: 1.235 V

Initial tolerance: -2.43% / +2.02% (typical production spec)

Temperature coefficient: 150 ppm/°C

Output/cathode current capability: up to 20 mA

Noise (10 Hz to 10 kHz): 60 Vrms (value appears high; see datasheet for correct scale)

Small SOT-23-3 footprint, TO-236-3 / SC-59 compatible

ROHS3 compliant, Pb-free NOPB

Surface-mount for automated assembly

Supplier device package: SOT-23-3

Mounting type: Surface Mount

Package: Tape & Reel (TR)

Key Advantages

Simple, low-cost precision reference with just a series resistor

Small size saves PCB area in compact designs

Wide cathode current range enables flexible biasing

Stable over temperature with modest drift

Ideal for low-power systems that need a reliable 1.235 V reference

Shunt topology works across varying supply voltages without a dedicated regulator

Easy drop-in for legacy LM385 designs

Packaging

Package type: SOT-23-3 (also referenced as TO-236-3, SC-59)

Material: Molded epoxy, standard plastic package

Typical size: ~2.9 mm x ~1.3 mm x ~1.0 mm (L x W x H)

Pin configuration (typical for shunt reference in SOT-23-3):

Pin 1: Anode

Pin 2: Cathode (reference terminal)

Pin 3: NC (no connect)

Tape & Reel: Ready for high-volume automated placement

Thermal characteristics (typical, board-dependent):

RθJA ≈ 300°C/W

RθJC ≈ 125°C/W

Electrical properties:

VREF: 1.235 V fixed

Tolerance: -2.43% / +2.02%

Tempco: 150 ppm/°C

Cathode/output current: up to 20 mA (verify recommended operating range in datasheet)

Noise 10 Hz–10 kHz: 60 Vrms (check datasheet for correct magnitude)

Compliance: ROHS3 Compliant, Pb-free NOPB

Moisture sensitivity: Typically MSL 1 for SOT-23 (verify on datasheet/label)

Lifecycle

Status: Active and widely used. Not nearing discontinuation based on current market data.

Same-family/close equivalents from TI:

LM385Z-1.2 (TO-92 package)

LM185-1.2 (mil-grade temperature range)

LM285-1.2 (industrial temperature range)

LM4041-1.2 (low-power shunt reference, 1.225 V nominal, SOT-23)

TLV431A/TLV431B (adjustable shunt, can be set near 1.235 V with resistor network)

Alternatives from other brands:

Analog Devices LT1004-1.2 (1.205 V shunt reference diode)

onsemi LM4041-1.2 (SOT-23 shunt reference ~1.225 V)

Vishay TLVH431A / TLV431A (adjustable shunt, 1.24 V reference, setpoint via resistors)

Diodes Inc ZR431 / TL431 variants (adjustable shunt references)

If you need drop-in mechanical alternatives in SOT-23-3 or tighter accuracy options, contact Y-IC via our website. We will recommend the best-fit equivalent based on your design goals.

Key Application Areas

Precision biasing and reference rails for ADCs/DACs

Sensor excitation and low-power instrumentation

Portable and battery-powered equipment

Threshold detection, power monitoring, and supervisory circuits

LCD contrast/reference generation

General analog circuits that need a stable 1.235 V reference

Datasheet

Our website hosts the most authoritative and up-to-date datasheet for LM385M3-1.2/NOPB. Download it directly from this page to confirm pinout, noise magnitude, recommended operating current, and detailed specifications.

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