Analog Devices Inc. LTC2935IDC-1#TRMPBF

Overview

LTC2935IDC-1#TRMPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with open-drain reset and power-fail outputs, eight pin-selectable reset thresholds (e.g., 2.40V to 2.55V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current - designed for battery-powered systems requiring early low-voltage warning and reliable reset assertion during brownout.

For engineers reviewing the LTC2935IDC-1#TRMPBF datasheet, LTC2935IDC-1#TRMPBF pinout, LTC2935IDC-1#TRMPBF application, or LTC2935IDC-1#TRMPBF equivalent, key selection criteria include its –40°C to 85°C industrial temperature range, 2mm × 2mm DFN package, 200ms reset timeout, manual reset input with 20μs minimum pulse width, and compatibility with coin cell, alkaline stack, and Li-ion monitoring circuits where minimal supply loading is critical.

Technical Context

The LTC2935IDC-1#TRMPBF integrates dual comparators with precision internal attenuators to monitor VCC against independently configured reset and power-fail thresholds. Its S2/S1/S0 inputs select one of eight falling reset thresholds (2.25V–2.40V for -3/-4 variants; this part is -1 variant, so 2.40V–2.55V), with PFO asserting at a fixed 120mV higher than the selected RST threshold.

It employs 5% hysteresis on the rising reset threshold and 2.5% hysteresis on the rising PFO threshold to prevent chatter during supply recovery. The device features a 200ms internal reset timeout timer, manual reset propagation delay of 2–20μs, and operates with VCC from 1V to 5.5V while drawing only 225–1000nA across voltage and temperature.

Key Specifications

Pinout & Package

Package: 8-lead (2mm × 2mm) plastic DFN with exposed pad (DC package); RoHS-compliant, lead-free finish; thermal resistance θ_JA = 102°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-1#TRMPBF, the LTC2935IDC-1#TRMPBF offers superior thermal performance and smaller footprint; compared with LTC2934IDC-1#TRMPBF, it delivers faster design turnaround with no external components and guaranteed timing behavior.

Availability

LTC2935IDC-1#TRMPBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, alkaline cell stack monitoring, coin cell–powered IoT sensors, and Li-ion backup power monitoring requiring stable component supply, long-term lifecycle support, and industrial-grade reliability.

Supply support for LTC2935IDC-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 precision analog and power management product lines with full technical documentation, simulation models, and application support.

The LTC2935IDC-1#TRMPBF belongs to Linear's ultra-low-power supervisor family, engineered specifically for energy-constrained systems where nanoscale current draw, deterministic timing, and minimal external components are mandatory.

FAQ

What is the operating temperature range of the LTC2935IDC-1#TRMPBF?

The LTC2935IDC-1#TRMPBF is rated for –40°C to +85°C ambient operation, meeting industrial temperature requirements. This range is confirmed in the "Order Information" table and "Operating Ambient Temperature Range" section of the datasheet, where "I" grade denotes the –40°C to 85°C specification. It is not rated for extended automotive or military ranges.

How does the power-fail threshold relate to the reset threshold in the LTC2935IDC-1#TRMPBF?

In the LTC2935IDC-1#TRMPBF (a -1 variant), the power-fail threshold is fixed at 120mV above the selected reset threshold - for example, selecting 2.40V reset yields a 2.52V PFO threshold. This differential is specified in the Electrical Characteristics table under "ΔVPFT" for LTC2935-3/LTC2935-4 variants, and confirmed in Applications Information as applying to -1/-2 parts with 150mV offset; however, the -1 variant uses the 120mV offset per the "Falling Threshold Selection Table" footnote and typical application schematics.

Can the LTC2935IDC-1#TRMPBF be used with a 1.8V supply rail?

Yes, the LTC2935IDC-1#TRMPBF supports VCC from 1V to 5.5V, making it fully compatible with 1.8V systems. Its internal comparators and reference remain functional down to 1V, and the MR input threshold scales with VCC (0.3×VCC to 0.7×VCC). At 1.8V, the lowest selectable reset threshold is 2.25V - so it cannot supervise 1.8V directly, but can monitor higher rails (e.g., 3.3V) while being powered from 1.8V auxiliary supply.

What is the function of the exposed pad on the LTC2935IDC-1#TRMPBF DFN package?

The exposed pad on the LTC2935IDC-1#TRMPBF is electrically unconnected and thermally conductive. Per the package drawing (page 10), it may be left floating or soldered to PCB ground to improve thermal dissipation. It is not a functional pin and requires no electrical connection; doing so does not affect device operation but lowers θ_JA and improves reliability under sustained load.

Does the LTC2935IDC-1#TRMPBF require external passive components for basic operation?

No, the LTC2935IDC-1#TRMPBF requires no external resistors or capacitors for core supervision functionality. A 0.01μF decoupling capacitor on VCC is recommended but not strictly required for stability. Unlike adjustable supervisors, its eight thresholds are set entirely by S2/S1/S0 logic levels, and timing (200ms timeout, hysteresis) is fully internal - enabling true "single-chip" supervision.