Analog Devices Inc. LTC2906ITS8#TRPBF

Overview

LTC2906ITS8#TRPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with one pin-selectable threshold input (5V/3.3V/2.5V) and one adjustable 0.5V input, designed for reliable power-up, brownout, and reset supervision in multi-rail systems. It features ±1.5% threshold accuracy over –40°C to +85°C, 200ms fixed reset timeout, open-drain RST output, and guaranteed operation down to V1 ≥ 1V or VCC ≥ 1V - used in industrial embedded controllers requiring deterministic reset behavior under voltage margining.

For engineers reviewing the LTC2906ITS8#TRPBF datasheet, LTC2906ITS8#TRPBF pinout, LTC2906ITS8#TRPBF application, or LTC2906ITS8#TRPBF equivalent, key selection criteria include its fixed 200ms reset delay, three-state programming of supply tolerance (5%/7.5%/10%), internal VCC auto-select, glitch immunity, and compatibility with noisy DC-DC outputs in space-constrained SOT-23 designs.

Technical Context

The LTC2906ITS8#TRPBF integrates two independent comparators: one with programmable thresholds via S1/TOL pins for V1 (5V/3.3V/2.5V), and another with a fixed 0.5V reference for VADJ, both sharing a common open-drain RST output. Its internal bandgap reference and resistor network ensure ±1.5% threshold accuracy across temperature without external calibration.

Reset assertion is triggered when either V1 or VADJ falls below its programmed threshold; recovery requires both inputs to remain above threshold for the full 200ms timeout. Power detection logic uses VMAX = max(V1, VCC), enabling guaranteed RST low state even when V1 drops to 1V while VCC remains active - critical for auxiliary-supply-backed systems.

Key Specifications

Pinout & Package

8-lead TSOT-23 plastic package (JEDEC MO-193), 1mm profile, exposed pad not present (unlike DFN). Pin 1 marked by chamfered corner; pin numbering clockwise from top-left when viewed from top.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply monitoring applications.

Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2906ITS8#TRPBF provides unique dual-rail supervision with programmable thresholds, ±1.5% accuracy, and 200ms timeout - making it suitable for modern multi-voltage systems where flexibility and precision outweigh lowest-cost alternatives.

Availability

LTC2906ITS8#TRPBF is available at Aetrix Electronics and suitable for industrial automation, medical imaging equipment, and telecom infrastructure requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2906ITS8#TRPBF 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2906ITS8#TRPBF belongs to Linear's precision power supervision product line, engineered specifically for deterministic reset behavior in mission-critical embedded systems where voltage margining, temperature stability, and glitch immunity are non-negotiable.

FAQ

What is the operating temperature range for the LTC2906ITS8#TRPBF?

The LTC2906ITS8#TRPBF is rated for –40°C to +85°C (Industrial grade), as indicated by the "I" suffix in the part number. This range covers most industrial, automotive cabin, and telecom applications where ambient temperatures exceed commercial limits. The ±1.5% threshold accuracy is guaranteed across this full range, unlike commercial-grade variants that specify accuracy only at 25°C.

Does the LTC2906ITS8#TRPBF require external components for basic operation?

No, the LTC2906ITS8#TRPBF operates autonomously with only bypass capacitors: 0.1µF on V1, VCC, and VADJ pins. No external resistors or timing capacitors are needed - the 200ms reset delay is internal, and threshold selection is done via S1/TOL pin connections (V1, GND, or open). This reduces BOM count and layout area versus competitors requiring external RC networks.

How does the LTC2906ITS8#TRPBF handle simultaneous undervoltage on both V1 and VADJ inputs?

When either V1 or VADJ drops below its programmed threshold, the LTC2906ITS8#TRPBF immediately asserts RST low. If both fall simultaneously, RST remains asserted until both recover above their respective thresholds and sustain that state for the full 200ms timeout. The device does not prioritize one input - it monitors both continuously and triggers on the first fault, ensuring no single-rail failure escapes detection.

Can the RST and RST outputs of the LTC2906ITS8#TRPBF drive an LED directly?

No - the RST and RST outputs are open-drain and lack sink/source strength for direct LED driving. To indicate power-good status, connect an LED between VCC and RST with a current-limiting resistor (e.g., 499Ω for ~10mA at 5V), as shown in typical application circuit 2906 TA02. Direct connection risks exceeding VOL specs or damaging the output stage due to excessive current.

Is the LTC2906ITS8#TRPBF pin-compatible with the LTC2907ITS8#TRPBF?

No - although both share the same TSOT-23-8 package and pinout numbering, the LTC2906ITS8#TRPBF has RST on Pin 2 and RST on Pin 3, while the LTC2907ITS8#TRPBF replaces RST with TMR (timing capacitor input) on Pin 2. Swapping them without board revision will cause functional failure: the LTC2907's TMR pin cannot drive a reset load, and the LTC2906's RST pin cannot accept a timing capacitor.