Analog Devices Inc. LT1790ACS6-4.096#TRMPBF

Overview

LT1790ACS6-4.096#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower, low-dropout, precision series voltage reference in a 6-lead TSOT-23 package, delivering 4.096V output with ±0.05% initial accuracy, 10ppm/°C max temperature coefficient, and 60µA max supply current. It operates from 4.6V to 18V input and supports both sourcing and sinking up to 5mA, making it ideal for high-resolution ADC/DAC biasing in portable data acquisition systems.

For engineers reviewing the LT1790ACS6-4.096#TRMPBF datasheet, LT1790ACS6-4.096#TRMPBF pinout, LT1790ACS6-4.096#TRMPBF application, or LT1790ACS6-4.096#TRMPBF equivalent, key selection criteria include guaranteed 0°C to 70°C operation, low thermal hysteresis (40ppm), sub-120mV dropout at 5mA source, and compatibility with negative reference configurations using external resistors.

Technical Context

The LT1790ACS6-4.096#TRMPBF employs curvature-compensated bandgap architecture with post-package trimming of thin-film resistors to achieve its 10ppm/°C tempco and ±0.05% output accuracy. Its internal design enables stable operation with 1µF output capacitance and supports bidirectional current flow-sourcing up to 5mA for positive references or sinking up to 3mA for negative reference topologies.

It features a wide 4.6V–18V input range, 250ppm/mA load regulation (sourcing), and 300ppm/mA load regulation (sinking), with turn-on time of 700µs into 1µF. The device is specified for functional operation from –40°C to 125°C, though this specific grade (CS6) is rated for 0°C to 70°C ambient.

Key Specifications

Pinout & Package

6-Lead Plastic TSOT-23 (0.95mm × 1.6mm × 0.85mm height), RoHS-compliant, lead-free finish. Pin 1 marked by dot; pin 4 is exposed pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3040AIDBZR and ADR3440ARJZ-R7, the LT1790ACS6-4.096#TRMPBF uniquely combines ±0.05% accuracy, 10ppm/°C tempco, and bidirectional current handling in a 6-pin TSOT-23-enabling compact, dual-polarity reference designs without performance trade-offs in portable instrumentation.

Availability

LT1790ACS6-4.096#TRMPBF is available at Aetrix Electronics and suitable for portable instrumentation, high-resolution data acquisition, industrial PLC analog input modules, and battery-operated sensor nodes requiring stable component supply with traceable sourcing and lifecycle continuity.

Supply support for LT1790ACS6-4.096#TRMPBF 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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, renowned for high-performance voltage references, amplifiers, and power management ICs targeting demanding industrial and instrumentation applications.

The LT1790 family was designed specifically for micropower, high-accuracy reference needs in space-constrained, battery-sensitive systems-emphasizing low dropout, low tempco, and bidirectional operation without external compensation.

FAQ

What is the maximum load current the LT1790ACS6-4.096#TRMPBF can source while maintaining output accuracy?

The LT1790ACS6-4.096#TRMPBF guarantees output accuracy within ±0.05% up to 5mA source current, provided input voltage remains ≥4.216V (4.096V + 120mV dropout). At 5mA, load regulation is 250ppm/mA, contributing ≤1.02mV error - well within the ±2.05mV initial tolerance band. Exceeding 5mA risks violating the 0.1% output deviation specification.

Can the LT1790ACS6-4.096#TRMPBF be used to generate a negative reference voltage?

Yes, the LT1790ACS6-4.096#TRMPBF can operate as a negative reference by sinking current. When configured with an external resistor between VOUT and a negative supply rail (e.g., –5V), it regulates VOUT at –4.096V relative to ground. The datasheet confirms 3mA sink capability and specifies minimum operating current of 100µA for –4.096V operation at 0.1% tolerance.

What is the recommended output capacitor for stability with the LT1790ACS6-4.096#TRMPBF?

A minimum 1µF ceramic capacitor is required at the VOUT pin for stability, as validated across all operating conditions in the datasheet. The 4.096V version specifies CL = 1µF and VIN = 4.6V in electrical characteristics tables. Larger values (e.g., 4.7µF) further reduce output impedance above 1kHz but do not improve low-frequency noise or drift performance.

Does the LT1790ACS6-4.096#TRMPBF require a heatsink in standard PCB layouts?

No heatsink is required. With 60µA max supply current and 4.096V output, worst-case power dissipation is <1.2mW at 18V input (13.9V × 60µA). The TSOT-23 package has θ_JA = 230°C/W, resulting in <0.3°C junction rise above ambient - negligible for commercial-temperature operation. Thermal relief pads are unnecessary.

How does the LT1790ACS6-4.096#TRMPBF compare to the LT1790BCS6-4.096#TRMPBF in terms of accuracy and temperature coefficient?

The LT1790ACS6-4.096#TRMPBF offers ±0.05% initial accuracy and 10ppm/°C max temperature coefficient, whereas the LT1790BCS6-4.096#TRMPBF provides ±0.1% accuracy and 25ppm/°C max tempco. Both share identical package, pinout, supply current (60µA max), and dropout voltage (120mV at 5mA), differing only in trimmed performance grades - A-grade targets high-precision metrology, B-grade suits cost-sensitive industrial controls.