Analog Devices Inc. LTC2935ITS8-3#TRMPBF

Overview

LTC2935ITS8-3#TRMPBF from Analog Devices (formerly 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 quiescent current. It provides system initialization, early low-voltage warning, and reset generation for battery-powered systems operating from –40°C to 85°C.

For engineers reviewing the LTC2935ITS8-3#TRMPBF datasheet, LTC2935ITS8-3#TRMPBF pinout, LTC2935ITS8-3#TRMPBF application, or LTC2935ITS8-3#TRMPBF 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.

Technical Context

The LTC2935ITS8-3#TRMPBF integrates two precision comparators-one for reset (VRTF) and one for power-fail (VPFT)-with independent hysteresis (5% for VRTF, 2.5% for VPFT). Its internal attenuators enable eight discrete falling-threshold settings via S2/S1/S0 logic inputs, each paired with a fixed offset power-fail threshold.

It features a manual reset input (MR) with 20μs minimum pulse width and 200ms debounced release timing, open-drain RST and PFO outputs rated for 5mA sink, and operation across 1V to 5.5V VCC. The device draws only 500nA typical supply current at 25°C and maintains ±1.5% threshold accuracy from –40°C to 85°C.

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 LTC2935ITS8-1#TRMPBF, the LTC2935ITS8-3#TRMPBF targets lower-voltage battery systems with tighter PFO margins; versus LTC2934ITS8#TRMPBF, it trades adjustability for zero-component simplicity and guaranteed factory-trimmed accuracy.

Availability

LTC2935ITS8-3#TRMPBF is available at Aetrix Electronics and suitable for battery-powered equipment, wireless sensor nodes, security system peripherals, and point-of-sale terminals requiring stable component supply across industrial temperature ranges.

Supply support for LTC2935ITS8-3#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.

The LTC2935ITS8-3#TRMPBF belongs to Linear's ultralow-power supervisor family, designed specifically for energy-constrained applications where long battery life, precise voltage monitoring, and minimal external components are critical.

FAQ

What is the exact reset threshold range supported by LTC2935ITS8-3#TRMPBF?

The LTC2935ITS8-3#TRMPBF supports eight discrete falling reset thresholds: 1.60V, 1.72V, 1.84V, 1.96V, 2.08V, 2.20V, 2.32V, and 2.44V. These values are factory-trimmed and selected via S2/S1/S0 logic inputs. Each corresponds to a fixed +120mV power-fail threshold, e.g., 1.60V reset → 1.72V PFO.

Does LTC2935ITS8-3#TRMPBF require external pull-up resistors on RST and PFO?

Yes - the LTC2935ITS8-3#TRMPBF uses open-drain outputs for both RST and PFO, so external pull-up resistors are required for proper logic-level translation. Recommended values range from 10kΩ to 470kΩ, depending on speed and power requirements; pull-up voltage may exceed VCC (up to 5.5V).

How does the manual reset (MR) function behave on LTC2935ITS8-3#TRMPBF?

When MR is pulled low (e.g., via pushbutton to GND), the LTC2935ITS8-3#TRMPBF forces RST low immediately. After MR returns high, RST remains low for a guaranteed 200ms timeout before releasing. The MR input has an internal 900kΩ pull-up to VCC and accepts logic-low signals down to 0.3·VCC.

Can LTC2935ITS8-3#TRMPBF monitor supplies below 1V?

No - the LTC2935ITS8-3#TRMPBF requires VCC ≥ 1V to operate. Its lowest specified reset threshold is 1.60V, and internal circuitry (comparators, reference, timer) is not functional below 1V. For sub-1V monitoring, consider alternative supervisors like LTC2915-series with adjustable thresholds.

What is the maximum sink current capability of RST and PFO on LTC2935ITS8-3#TRMPBF?

Both RST and PFO outputs on the LTC2935ITS8-3#TRMPBF are rated for ±5mA DC sink/source per Absolute Maximum Ratings. In normal operation, they reliably sink ≥3mA at VOL ≤150mV (VCC = 3V), supporting standard CMOS and TTL logic interfaces without additional buffering.