Texas Instruments LT1004CLPR-2-5

Overview

LT1004CLPR-2-5 from Texas Instruments is a two-terminal micropower band-gap voltage reference diode delivering 2.5 V nominal output with ±20 mV initial accuracy (±0.8%), 20 ppm/°C average temperature coefficient, and 0.2 Ω typical reference impedance at 100 µA. It operates from 8 µA to 20 mA reverse current and is optimized for portable meter references and battery-operated instrumentation.

For engineers reviewing the LT1004CLPR-2-5 datasheet, LT1004CLPR-2-5 pinout, LT1004CLPR-2-5 application, or LT1004CLPR-2-5 equivalent, key selection criteria include low-current operation down to 8 µA, stable 2.5 V reference under varying load and temperature, TO-92 package compatibility, and direct replacement capability for LM285/LM385-2.5 devices in legacy designs.

Technical Context

The LT1004CLPR-2-5 uses a precision band-gap core with internal trimming to achieve tight initial tolerance and low thermal drift without external components. Its two-terminal architecture simplifies PCB layout by eliminating separate supply and ground pins, while its low 0.2 Ω dynamic impedance ensures minimal output variation across 1 mA–20 mA load current changes.

Designed for operation from 0°C to 70°C, the device maintains 2.47 V to 2.53 V reference voltage over full temperature range at 100 µA bias. Its 60 µV to 120 µV broadband noise (10 Hz–10 kHz) and 20 ppm/khr long-term stability support high-resolution analog measurement systems where drift and noise directly impact accuracy.

Key Specifications

Pinout & Package

LT1004CLPR-2-5 is housed in a TO-92 (LP) plastic cylindrical package with three leads: Anode (pin 1), Cathode (pin 2), and NC (pin 3). Terminals 6 and 8 shown in SOIC/TSSOP drawings are not present; only pins 1 and 2 are functional. Pin 3 has no internal connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Compared with LM385B-2.5/NOPB, LT1004CLPR-2-5 delivers tighter initial tolerance and lower impedance for improved load regulation; versus REF3025AIDBZR, it eliminates supply dependency and fits legacy TO-92 footprints but trades absolute accuracy for simplicity and ultra-low power.

Availability

LT1004CLPR-2-5 is available at Aetrix Electronics and suitable for portable meter reference, portable test instruments, and battery-operated systems requiring stable component supply with long-term availability and consistent parametric performance.

Supply support for LT1004CLPR-2-5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.

The LT1004 series was designed specifically for micropower, two-terminal voltage reference applications in portable and battery-constrained instrumentation-prioritizing low operating current, stable output, and ease of integration over high-speed or wide-supply-range operation.

FAQ

What is the operating temperature range for LT1004CLPR-2-5?

The LT1004CLPR-2-5 is characterized for operation from 0°C to 70°C. Within this range, its reference voltage remains between 2.47 V and 2.53 V at 100 µA bias current. Exceeding 70°C risks exceeding the device's specified electrical performance and may accelerate long-term drift. The 'C' suffix explicitly denotes the commercial temperature grade, distinguishing it from the industrial-grade LT1004ILPR-2-5 (–40°C to 85°C).

Can LT1004CLPR-2-5 replace LM285-2.5 in existing designs?

Yes, LT1004CLPR-2-5 is a pin-for-pin and functionally compatible replacement for LM285-2.5 in TO-92 packages. It offers improved specifications-including tighter initial accuracy (±20 mV vs ±30 mV), lower reference impedance (0.2 Ω vs ~10 Ω), and reduced temperature coefficient (20 ppm/°C vs 50 ppm/°C). No PCB changes or schematic modifications are required, making it a drop-in upgrade for legacy meter and sensor designs.

What is the minimum reverse current required for LT1004CLPR-2-5 to regulate properly?

The LT1004CLPR-2-5 requires a minimum reverse current of 8 µA to establish regulation, as specified in the datasheet's electrical characteristics table. Below this threshold, the output voltage drops nonlinearly and cannot be guaranteed. For reliable operation, design bias networks to deliver ≥10 µA under worst-case conditions (e.g., lowest supply voltage, highest temperature) to ensure margin and stability.

How does LT1004CLPR-2-5 handle noise in precision measurement circuits?

LT1004CLPR-2-5 generates 60–120 µV RMS broadband noise over 10 Hz–10 kHz, measured at 100 µA bias. This noise level is low enough to support 16-bit ADC systems without degrading ENOB. For ultra-low-noise applications, adding a simple RC filter (e.g., 10 kΩ + 1 µF) reduces output noise to <10 µV RMS below 10 Hz-commonly used in thermocouple amplifiers and strain gauge bridges where LT1004CLPR-2-5 serves as excitation reference.

Is LT1004CLPR-2-5 RoHS compliant and lead-free?

Yes, LT1004CLPR-2-5 is RoHS compliant and lead-free. Per TI's packaging documentation, it carries the "Green (RoHS & no Sb/Br)" eco-plan designation, meaning it contains no lead, bromine, or antimony-based flame retardants. The lead finish is CU NIPDAU, and the device meets JEDEC MSL Level-1 moisture sensitivity classification-suitable for standard reflow processes without baking.