Texas Instruments LT1004IPWR-1-2

Overview

LT1004IPWR-1-2 from Texas Instruments is a two-terminal micropower band-gap voltage reference IC delivering 1.235 V nominal output with ±4 mV initial accuracy, 20 ppm/°C temperature coefficient, and 0.6 Ω reference impedance at 100 µA - designed for precision low-power systems including portable test instruments and battery-operated sensor interfaces.

For engineers reviewing the LT1004IPWR-1-2 datasheet, LT1004IPWR-1-2 pinout, LT1004IPWR-1-2 application, or LT1004IPWR-1-2 equivalent, key selection criteria include its −40°C to 85°C industrial temperature range, TSSOP-8 package, 8 µA minimum operating current, 20 mA max reverse current capability, and compatibility with current-loop instrumentation and cold-junction compensation circuits.

Technical Context

The LT1004IPWR-1-2 implements a precision band-gap reference topology with internal trimming to achieve tight initial voltage tolerance and low thermal drift. Its two-terminal architecture operates in either forward-biased (anode-to-cathode) or reverse-biased (cathode-to-anode) mode depending on circuit configuration.

It features a low 0.6 Ω dynamic reference impedance at 100 µA and delivers 60–120 µV broadband noise (10 Hz–10 kHz), enabling stable biasing in high-resolution ADCs and low-noise amplifiers without external filtering in many applications.

Key Specifications

Pinout & Package

TSSOP-8 package (PW), 3.0 mm × 4.4 mm body, 1.2 mm max height, lead-free NiPdAu finish, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM385BIMX-1.2 and REF3012AIDBZR, the LT1004IPWR-1-2 uniquely balances ultra-low power (8 µA min), industrial temperature rating, and two-terminal simplicity - making it optimal for retrofitting legacy LM285 designs or space-constrained battery systems where ground pin allocation is prohibitive.

Availability

LT1004IPWR-1-2 is available at Aetrix Electronics and suitable for portable test instrumentation, battery-operated sensor nodes, and current-loop transmitters requiring stable component supply with guaranteed long-term continuity.

Supply support for LT1004IPWR-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 leader specializing in analog, embedded processing, and digital signal technologies with over 90 years of innovation in precision analog components.

The LT1004 series was developed to deliver high-accuracy voltage references at micropower levels - targeting portable, battery-powered, and industrial instrumentation where power efficiency and thermal stability are critical.

FAQ

What is the operating temperature range for the LT1004IPWR-1-2?

The LT1004IPWR-1-2 is rated for operation from −40°C to +85°C, meeting industrial-grade environmental requirements. This specification is validated across all electrical parameters in the datasheet, including reference voltage accuracy, temperature coefficient, and long-term stability. The "I" suffix explicitly denotes this extended temperature grade, distinguishing it from the commercial-grade "C" variants.

Can the LT1004IPWR-1-2 replace an LM285-1.2 in an existing design?

Yes, the LT1004IPWR-1-2 is a pin-for-pin and functionally compatible replacement for the LM285-1.2, with identical TSSOP-8 pinout and two-terminal operation. It improves upon the LM285 with tighter initial accuracy (±4 mV vs ±20 mV), lower temperature coefficient (20 ppm/°C vs 100 ppm/°C), and enhanced long-term stability - all without requiring PCB or schematic changes.

What is the minimum current required for the LT1004IPWR-1-2 to regulate properly?

The LT1004IPWR-1-2 requires a minimum reverse current of 8 µA to maintain regulation within specifications. Below this threshold, reference voltage deviation increases nonlinearly. Datasheet Figure 2 confirms stable operation begins at ≥8 µA across the full −40°C to 85°C range, making it suitable for ultra-low-power current-source biasing.

How does the LT1004IPWR-1-2 handle noise-sensitive applications like high-resolution ADCs?

The LT1004IPWR-1-2 delivers 60–120 µV broadband noise (10 Hz–10 kHz) and exhibits low 0.6 Ω output impedance, minimizing interaction with ADC input capacitance. For 16-bit+ systems, datasheet Figure 7 shows filtered output noise drops below 10 µV with a 1-kHz RC low-pass - confirming suitability for precision data acquisition without complex external filtering.

Is the LT1004IPWR-1-2 RoHS-compliant and lead-free?

Yes, the LT1004IPWR-1-2 is RoHS-compliant and lead-free, with NiPdAu lead finish and green (halogen-free) packaging per TI's Eco Plan. It meets JEDEC MSL Level-1 moisture sensitivity classification and is qualified for standard Pb-free reflow profiles up to 260°C peak temperature.