Analog Devices Inc. LTC2935ITS8-3#TRPBF

Overview

LTC2935ITS8-3#TRPBF from Analog Devices (acquired Linear Technology) is an ultra-low power voltage supervisor IC with pin-selectable reset and power-fail thresholds, open-drain RST/PFO outputs, and 500nA typical quiescent current. It provides system initialization, early warning of supply collapse, and reset generation for battery-powered systems operating from –40°C to 85°C.

For engineers reviewing the LTC2935ITS8-3#TRPBF datasheet, LTC2935ITS8-3#TRPBF pinout, LTC2935ITS8-3#TRPBF application, or LTC2935ITS8-3#TRPBF equivalent, key selection considerations include its eight factory-trimmed reset thresholds (1.60V–2.40V), fixed 120mV power-fail margin, 200ms reset timeout, ±1.5% threshold accuracy over temperature, and TSOT-23-8 package compatibility with space-constrained portable designs.

Technical Context

The LTC2935ITS8-3#TRPBF implements dual independent comparators: one for reset (VRTF) and one for power-fail (VPFT), both referenced to VCC and configured via S2/S1/S0 logic inputs. Its internal precision attenuators enable eight discrete falling-threshold settings without external resistors.

It features built-in 5% hysteresis on the reset comparator and 2.5% hysteresis on the power-fail comparator, ensuring noise immunity during supply transients. The device uses a 200ms internal timer to delay RST release after VCC recovery, preventing premature processor startup during brown-out recovery.

Key Specifications

Pinout & Package

Package: 8-Lead TSOT-23 (ThinSOT™), 2.9mm × 1.6mm footprint, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2934ITS8-3#TRPBF, LTC2935ITS8-3#TRPBF delivers superior accuracy and lower component count via integrated trimming; compared with LTC2915CTS8#TRMPBF, it achieves 2.4× lower quiescent current at the cost of reduced threshold granularity and no watchdog capability - making it optimal for pure battery-life-critical supervision.

Availability

LTC2935ITS8-3#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless IoT endpoints, point-of-sale terminals, and industrial security panels requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LTC2935ITS8-3#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LTC supervisory portfolio.

The LTC2935 family was designed specifically for ultra-low-power battery supervision in space- and energy-constrained applications, emphasizing sub-1μA operation, factory-trimmed precision, and minimal external components.

FAQ

What is the exact reset threshold for LTC2935ITS8-3#TRPBF when S2=S1=S0=GND?

The LTC2935ITS8-3#TRPBF has a nominal reset threshold of 2.44V when all three select pins (S2, S1, S0) are tied to GND. This value is factory-trimmed and guaranteed within ±1.5% over the full –40°C to +85°C operating range. The corresponding power-fail threshold is 2.56V, maintaining the fixed +120mV offset characteristic of the -3/-4 variant.

Does LTC2935ITS8-3#TRPBF support operation down to 1.0V VCC?

No. The LTC2935ITS8-3#TRPBF requires a minimum VCC of 1.6V to guarantee proper comparator operation and output drive strength. Below 1.6V, the internal circuitry may not activate reliably, and RST/PFO behavior is undefined. The lowest valid reset threshold is 1.60V, meaning the device is intended for systems where the monitored rail remains ≥1.6V during normal operation.

Can LTC2935ITS8-3#TRPBF drive a 10kΩ pull-up resistor on RST?

Yes. The LTC2935ITS8-3#TRPBF open-drain RST output is rated to sink ≥200μA at VOL ≤100mV (VCC = 3V). With a 10kΩ pull-up to 3.3V, the resulting low-state current is ~330μA - slightly exceeding the 200μA spec. For guaranteed VOL ≤100mV, use ≥15kΩ; however, many designs successfully use 10kΩ with acceptable VOL < 200mV in practice.

How does the manual reset function interact with automatic reset in LTC2935ITS8-3#TRPBF?

When MR is pulled low while VCC is above its reset threshold, the LTC2935ITS8-3#TRPBF forces RST low immediately. After MR returns high, RST remains low for a full 200ms timeout - identical to the automatic reset recovery timing. This ensures consistent reset duration regardless of trigger source, simplifying system-level timing analysis and eliminating race conditions during manual intervention.

Is the TSOT-23 package of LTC2935ITS8-3#TRPBF pin-compatible with other LTC29xx supervisors?

Yes, the TSOT-23-8 pinout of LTC2935ITS8-3#TRPBF matches LTC2934, LTC2915, and LTC2917 variants in the same package. However, functional compatibility is not guaranteed: LTC2934 uses resistor-programmed thresholds, LTC2915 includes a watchdog timer, and LTC2917 offers different threshold sets. Electrical substitution requires verification of threshold values, output type, and feature set against the target application.