Texas Instruments LM385DR-1-2

Mfr. Part

LM385DR-1-2

Manufacturer

Luminary Micro/Texas Instruments (TI). Y-IC is a quality distributor of TI products and we are committed to providing you with the best products and services.

Detailed Description

Low-voltage bandgap shunt voltage reference in 8-SOIC

Fixed 1.235 V output, ±2% initial accuracy

Micropower reference suitable for precision biasing and low-noise reference rails

Surface-mount, RoHS3 compliant, supplied in Tape & Reel for automated assembly

Operating temperature: 0°C to +70°C (TA), commercial grade

Key Features

Reference type: Shunt (two-terminal operation: anode and cathode)

Fixed output voltage: 1.235 V (min/fixed)

Tolerance: ±2% initial

Temperature coefficient: 20 ppm/°C typical

Output current capability: up to 20 mA (per provided data)

Noise (10 Hz to 10 kHz): 60 V RMS (as provided; please verify in the datasheet)

RoHS: ROHS3 compliant

Package: 8-SOIC (0.154", 3.90 mm body width), SMD

Mounting: Surface Mount (SMT)

Base product number: LM385

Key Advantages

Simple two-pin shunt topology for easy use as a precision reference or regulator clamp

Stable 1.235 V reference suitable for low-voltage systems and sensors

Tight tempco (20 ppm/°C typ) supports good accuracy over temperature

Fixed reference reduces BOM and design complexity versus adjustable shunts

SOIC package is robust, easy to place, and widely supported in manufacturing

Tape & Reel packaging streamlines high-volume pick-and-place

Packaging

Type: Tape & Reel (TR) for automated SMT processes

Package/case: 8-SOIC (JEDEC MS-012; body width 3.90 mm, body length approx. 4.9 mm; lead pitch 1.27 mm; 8 leads)

Material: Molded epoxy encapsulation with copper alloy leadframe (typical for SOIC; refer to datasheet for exact composition)

Pin configuration: Functionally two active pins (Cathode and Anode); remaining pins are typically NC or internal. Always follow the device pinout in the datasheet for the 8-SOIC DR pin mapping.

Thermal characteristics: SOIC packages typically exhibit ThetaJA on the order of ~100–120°C/W on a standard JEDEC board. Use the datasheet for exact thermal data and apply power derating above 25°C ambient.

Electrical properties (as provided): 1.235 V fixed reference; ±2% initial tolerance; 20 ppm/°C typ tempco; output current up to 20 mA; noise 60 V RMS (10 Hz to 10 kHz, verify in datasheet); cathode current listed as 15 A (as provided; this value appears unusually high for this device class—please confirm actual operating range in the datasheet before design-in).

Lifecycle

Current market status: Widely used legacy TI reference; no public end-of-life notice is broadly indicated for this specific ordering code in common channels as of recent industry knowledge. Please confirm with Y-IC for the latest lifecycle status.

Equivalent or alternative models (verify pinout, tolerance, temp range, noise, and tempco before substitution):

- Same-family and close TI options:

- LM385-1.2 variants in other packages (e.g., SOT-23 or different suffixes)

- LM4040-1.2 (1.225 V fixed shunt reference family, various grades/tolerances)

- TLV431/LMV431 (adjustable shunt, 1.24 V reference; use resistor divider to set 1.235 V)

- Other vendors (fixed ~1.2–1.25 V shunt references):

- Analog Devices/Linear Technology: LT1004-1.2, ADR130 (≈1.225 V), ADR1581 (≈1.25 V)

- ON Semiconductor: LM385-1.2 equivalents; LM4041-1.2

- Microchip: MCP100x/LM4040 family variants near 1.225 V (check exact voltage and topology)

- Series references (if series topology is acceptable rather than shunt):

- ADI/Maxim/TI 1.2–1.25 V series references (e.g., MAX60xx, LT6650 variants) with different noise/tempco profiles

If you need a one-to-one alternative with identical fit, form, and function, contact our sales team via the Y-IC website for vetted cross-references and stocking options.

Key Application Areas

Precision low-voltage references for ADCs, DACs, and comparators

Sensor excitation and biasing for bridge/RTD/transducers

Threshold generation, window detectors, and supervisory circuits

Low-noise reference rails in audio, instrumentation, and test equipment

Portable and battery-powered devices requiring a stable 1.235 V reference

Linear regulators, current sources, and shunt regulation clamps

Datasheet

The most authoritative and up-to-date datasheet for LM385DR-1-2 is available on our Y-IC product page. We strongly recommend downloading it from this page for exact specifications, pinout, and thermal/electrical limits.

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