Analog Devices Inc. LTC2935ITS8-1#TRMPBF

Overview

LTC2935ITS8-1#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 typical quiescent current. It provides system initialization, early low-voltage warning, and reset generation for battery-powered portable equipment operating from –40°C to 85°C.

For engineers reviewing the LTC2935ITS8-1#TRMPBF datasheet, LTC2935ITS8-1#TRMPBF pinout, LTC2935ITS8-1#TRMPBF application, or LTC2935ITS8-1#TRMPBF equivalent, key selection considerations include its eight binary-configurable reset thresholds (e.g., 2.44V to 3.45V), 200ms reset timeout, ±1.5% threshold accuracy over temperature, and TSOT-23-8 package compatibility with space-constrained designs.

Technical Context

The LTC2935ITS8-1#TRMPBF integrates two precision comparators: one for reset (RST) with 5% hysteresis and a second for power-fail warning (PFO) with 2.5% hysteresis, where PFO threshold exceeds the selected reset threshold by 150mV. Its internal attenuators and reference circuitry enable stable threshold operation across –40°C to 85°C ambient.

Threshold selection is implemented via three logic-level inputs (S2/S1/S0), each referenced to VCC, with leakage current ≤±10nA and input threshold at 0.3–0.7×VCC. The manual reset (MR) input features internal 900kΩ pull-up and 20μs minimum pulse width requirement, triggering a guaranteed 200ms RST assertion upon release.

Key Specifications

Pinout & Package

Package: 8-Lead TSOT-23 (ThinSOT™), 2.9mm × 1.6mm footprint, exposed pad optional for thermal enhancement. Compatible with standard SMT reflow profiles and 0.65mm pitch PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-1#TRMPBF, the -2 variant trades pin-compatible open-drain flexibility for simplified active-pull-up integration, while the LTC2934 offers programmability at the cost of external components - making the LTC2935ITS8-1#TRMPBF optimal for fixed-threshold, space- and power-constrained designs.

Availability

LTC2935ITS8-1#TRMPBF is available at Aetrix Electronics and suitable for portable medical sensors, wireless IoT endpoints, point-of-sale terminals, and security system peripherals requiring stable component supply across industrial temperature ranges and long-term battery operation.

Supply support for LTC2935ITS8-1#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 high-reliability analog IC portfolio, emphasizing precision, low power, and robust performance in harsh environments.

The LTC2935 series was designed specifically for ultra-low-power system supervision in battery-critical applications, delivering configurable thresholds, early-warning capability, and industrial-grade reliability in miniature packages.

FAQ

What is the operating temperature range for the LTC2935ITS8-1#TRMPBF?

The LTC2935ITS8-1#TRMPBF is rated for –40°C to 85°C ambient operation, conforming to the LTC2935I grade specification. This industrial temperature range is validated across all electrical parameters including reset threshold accuracy (±1.5% max), quiescent current (500nA typical), and reset timeout (200ms nominal), making it suitable for outdoor, automotive, and industrial deployments where thermal stability is critical.

How does the power-fail output (PFO) differ from the reset output (RST) in the LTC2935ITS8-1#TRMPBF?

In the LTC2935ITS8-1#TRMPBF, PFO asserts low 150mV above the configured reset threshold (e.g., 3.15V PFO for 3.00V RST), providing early warning of impending undervoltage. RST remains high until VCC falls below the reset threshold, then stays low for 200ms after VCC recovers above threshold +5% hysteresis. This separation enables firmware to initiate controlled shutdown before reset occurs, preserving data integrity.

Can the LTC2935ITS8-1#TRMPBF monitor supply voltages below 1.8V?

Yes - the LTC2935ITS8-1#TRMPBF supports VCC down to 1V and offers eight pin-selectable reset thresholds ranging from 2.25V to 3.30V for the -1 variant. While its lowest factory-set threshold is 2.25V, it can reliably supervise lower rails (e.g., 1.8V) by using external resistor dividers on VCC input, though this requires recalibration and is not covered by datasheet specifications. For dedicated sub-2V monitoring, the LTC2935-3/-4 variants offer 1.60V–2.44V thresholds.

Is the LTC2935ITS8-1#TRMPBF pin-compatible with other LTC2935 variants in TSOT-23-8?

Yes - all LTC2935 variants in the TSOT-23-8 package (e.g., LTC2935ITS8-1#TRMPBF, LTC2935ITS8-2#TRMPBF, LTC2935CTS8-3#TRMPBF) share identical pinout, footprint, and solder pad layout per LTC DWG #05-08-1637. Differences are limited to internal output topology (open-drain vs. active pull-up) and temperature grade (I vs. C), allowing drop-in replacement within the same package family when functional requirements align.

What is the maximum recommended pull-up resistor value for the RST and PFO outputs of the LTC2935ITS8-1#TRMPBF?

The datasheet recommends pull-up resistors between 10kΩ and 470kΩ for the open-drain RST and PFO outputs of the LTC2935ITS8-1#TRMPBF. At 470kΩ, VOL remains ≤150mV with 200μA sink current, ensuring logic-low compatibility with CMOS inputs. Higher values increase noise susceptibility and slow rise time; lower values increase static power draw. For 3.3V systems with 10μA MCU input leakage, 100kΩ provides optimal balance of speed, noise immunity, and power efficiency.