Analog Devices Inc. LT1019CH-5

Overview

LT1019CH-5 from Analog Devices (formerly Linear Technology) is a precision 5V bandgap voltage reference IC capable of sourcing and sinking up to 10mA in series or shunt mode, with ±3.5% to –13% output trim range, 0.05% initial tolerance, and 10ppm/°C temperature coefficient over –40°C to +85°C. It enables high-accuracy analog signal conditioning in industrial data acquisition systems.

For engineers reviewing the LT1019CH-5 datasheet, LT1019CH-5 pinout, LT1019CH-5 application, or LT1019CH-5 equivalent, key selection criteria include its dual-mode operation, curvature-corrected drift performance, ultralow line regulation (0.5ppm/V), and compatibility with legacy bandgap references such as REF-02 and AD581 in SO-8 and TO-5 packages.

Technical Context

The LT1019CH-5 implements wafer-level thin-film trimming for both reference core and output buffer, achieving <0.05% initial accuracy and curvature-corrected temperature response. Its architecture supports bidirectional current flow (±10mA), enabling use as either a series regulator or shunt reference without external components.

It features a dedicated TEMP pin providing PTAT voltage (~2.1mV/°C) with <0.05%/µA loading sensitivity, and a TRIM pin supporting asymmetric adjustment (–13% to +3.5% for 5V version). Minimum input-output differential is 0.9V at 1mA load, supporting low-line operation.

Key Specifications

Pinout & Package

LT1019CH-5 is housed in an 8-lead TO-5 metal can (H package), hermetically sealed for stability in harsh environments. Pin 1 is INPUT, Pin 2 is OUTPUT, Pin 3 is TEMP, Pin 4 is GND (case), Pins 5–7 are internally connected DNC terminals, and Pin 8 is TRIM.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1236CS8-5 and REF02CP, the LT1019CH-5 uniquely combines TO-5 hermetic packaging, dual-mode operation, on-chip TEMP sensing, and asymmetric trim-making it optimal for calibrated, high-reliability measurement systems where long-term stability and field recalibration matter.

Availability

LT1019CH-5 is available at Aetrix Electronics and suitable for industrial data acquisition, precision DAC reference, and bridge excitation applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LT1019CH-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

Analog Devices (including former Linear Technology) designs high-performance analog ICs for precision signal conditioning, power management, and RF applications.

The LT1019 product line delivers third-generation curvature-corrected bandgap references optimized for metrology-grade accuracy, low-noise data conversion, and robust operation in industrial and aerospace environments.

FAQ

What is the operating temperature range for the LT1019CH-5?

The LT1019CH-5 is specified for the industrial temperature range of –40°C to +85°C. Its 10 ppm/°C maximum temperature coefficient and 0.05% initial output voltage tolerance are guaranteed across this full range. The "H" suffix denotes the TO-5 metal can package, which provides superior thermal stability and hermetic sealing compared to plastic alternatives-critical for applications exposed to humidity or thermal cycling.

Can the LT1019CH-5 operate in shunt mode with negative output voltages?

Yes-the LT1019CH-5 supports true shunt-mode operation and can generate negative reference voltages when used with an external PNP transistor or N-channel MOSFET configured as a high-side current sink. In this configuration, the OUTPUT pin becomes the cathode of a negative shunt reference, enabling –5 V generation. The device's ability to sink up to 10 mA and tolerate input voltages down to –15 V (per absolute maximum ratings) makes it suitable for bipolar signal chain designs without requiring dual supplies.

How does the TEMP pin on the LT1019CH-5 function, and what is its design impact?

Pin 3 (TEMP) on the LT1019CH-5 provides a PTAT (Proportional To Absolute Temperature) voltage of approximately 2.1 mV/°C, referenced to GND. Unlike earlier bandgap references, the LT1019CH-5 buffers this node to reduce loading sensitivity to <0.05%/µA-ten times better than predecessors. This allows direct connection to an ADC input for thermal monitoring without degrading reference accuracy, enabling real-time compensation of system-level drift in high-precision instruments.

What is the purpose of the TRIM pin on the LT1019CH-5, and how much adjustment does it allow?

The TRIM pin (Pin 8) on the LT1019CH-5 enables precise output voltage calibration using an external potentiometer. For the LT1019CH-5, the trim range is +3.5% to –13%, allowing adjustment from 5.175 V down to 4.35 V. This asymmetric range is specifically designed to support common calibration targets like 5.120 V for 12-bit DAC full-scale alignment. The internal thin-film resistors maintain low TC coupling, ensuring trimmed accuracy remains stable over temperature.

Is the LT1019CH-5 stable with large output capacitors, and what are the stability limits?

The LT1019CH-5 is stable with all output capacitance values for the 5V version-unlike the 2.5V variant, which can oscillate between 400 pF and 2 µF under specific sink-current conditions. The 5V device maintains phase margin across 0–100 µF, including tantalum and ceramic types. However, for best transient response with fast load steps, a minimum DC load ≥1 mA is recommended; adding 2–5 Ω in series with the output capacitor further improves ringing suppression without compromising DC accuracy.