Texas Instruments LT1004ILP-1-2

Overview

LT1004ILP-1-2 from Texas Instruments is a two-terminal micropower band-gap voltage reference diode delivering 1.235 V nominal output with ±4 mV initial accuracy, 20 ppm/°C average temperature coefficient, and 0.6 Ω typical reference impedance at 100 µA. It operates from 8 µA to 20 mA and supports portable meter references and battery-operated instrumentation.

For engineers reviewing the LT1004ILP-1-2 datasheet, LT1004ILP-1-2 pinout, LT1004ILP-1-2 application, or LT1004ILP-1-2 equivalent, key selection criteria include low-current stability (IZ(min) = 8 µA), thermal performance over −40°C to 85°C, and TO-92 (LP) package compatibility with legacy LM285/LM385 footprints.

Technical Context

The LT1004ILP-1-2 uses a precision band-gap core optimized for operation at ultra-low currents, achieving stable 1.235 V output without external trimming. Its internal architecture minimizes curvature error across temperature and load, enabling direct use in high-accuracy analog signal chains.

Designed for industrial-grade operation (−40°C to 85°C), it maintains ≤20 mV total reference voltage change over full temperature range and current (IZ = 8 µA to 20 mA), with broadband noise of 60–120 µV RMS (10 Hz–10 kHz) and long-term drift of 20 ppm/khr.

Key Specifications

Pinout & Package

LT1004ILP-1-2 is housed in a TO-92 (LP) plastic cylindrical package with 3 leads: Anode (pin 1), Cathode (pin 2), and NC (pin 3). Terminals 1 and 2 are functional; pin 3 has no internal connection. The package meets JEDEC TO-226 Variation AA mechanical standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM385BZ-1.2, LT1004ILP-1-2 delivers 3× better initial accuracy and 5× lower tempco; versus REF191GS, it offers TO-92 through-hole compatibility and 70% lower quiescent current but trades 0.05 V output offset and slightly higher noise.

Availability

LT1004ILP-1-2 is available at Aetrix Electronics and suitable for portable meter reference, portable test instruments, and battery-operated systems requiring stable component supply with industrial temperature qualification.

Supply support for LT1004ILP-1-2 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 family was designed specifically for micropower, high-accuracy voltage reference applications in portable and industrial instrumentation where low-current stability and temperature robustness are critical.

FAQ

What is the nominal reference voltage of the LT1004ILP-1-2?

The LT1004ILP-1-2 provides a nominal reference voltage of 1.235 V at 100 µA test current. This value is specified across the full industrial temperature range (−40°C to +85°C) and remains stable within ±4 mV initial tolerance. The LT1004ILP-1-2 achieves this accuracy without external trimming, making it suitable for precision analog systems where calibration overhead must be minimized.

What is the minimum operating current required for the LT1004ILP-1-2 to regulate properly?

The LT1004ILP-1-2 requires a minimum reference current (IZ(min)) of 8 µA to maintain regulation, as confirmed in the electrical characteristics table. Below this threshold, output voltage deviates significantly from nominal. At 100 µA, the device achieves optimal stability and lowest impedance (0.6 Ω). The LT1004ILP-1-2 supports up to 20 mA, enabling flexible biasing in both micropower and moderate-current applications.

How does the LT1004ILP-1-2 compare to the LM285-1.2 in terms of performance?

The LT1004ILP-1-2 is explicitly documented as a pin-for-pin replacement for the LM285-1.2, offering superior specifications: ±4 mV vs ±20 mV initial accuracy, 20 ppm/°C vs 100 ppm/°C temperature coefficient, and 0.6 Ω vs 10 Ω reference impedance. These improvements allow the LT1004ILP-1-2 to deliver higher system accuracy without layout changes, especially in battery-powered and temperature-variable environments.

What package type is used for the LT1004ILP-1-2, and what are its key mechanical features?

The LT1004ILP-1-2 uses the TO-92 (LP) plastic cylindrical package per JEDEC TO-226 Variation AA. It has three leads: Anode (pin 1), Cathode (pin 2), and NC (pin 3). Mechanical dimensions include 4.00 mm max body height, 2.65 mm formed-lead width, and 12.70 mm min lead length. The LP package supports through-hole assembly and is compatible with legacy LM285/LM385 sockets and footprints.

Can the LT1004ILP-1-2 be used in a 3.3 V system with a series resistor?

Yes, the LT1004ILP-1-2 can be used in a 3.3 V system with a series resistor. For example, a 22 kΩ resistor delivers ~91 µA (well above the 8 µA minimum), ensuring stable 1.235 V output. The low reference impedance (0.6 Ω) minimizes load-induced error, and the device's 20 ppm/°C tempco maintains accuracy across ambient variations. This configuration is validated in TI Application Note Figure 20 ("Micropower Reference From 9-V Battery") adapted for lower voltages.