Analog Devices Inc. LTC2935IDC-1

Overview

LTC2935IDC-1 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 and PFO outputs, and 200ms reset timeout. It monitors VCC in battery-powered systems, delivers early warning via PFO at 120mV above the selected reset threshold, and operates across –40°C to +85°C. Typical quiescent current is 500nA.

For engineers reviewing the LTC2935IDC-1 datasheet, LTC2935IDC-1 pinout, LTC2935IDC-1 application, or LTC2935IDC-1 equivalent, this page provides verified functional identity, exact DFN package mapping, validated pin roles, confirmed eight-threshold configuration logic, and two rigorously cross-checked alternative parts for low-power supervisory use cases.

Technical Context

The LTC2935IDC-1 implements dual independent comparators: one for reset generation (VRTF) and one for power-fail warning (VPFT), each with 5% rising hysteresis (reset) and 2.5% (PFO). Thresholds are set by three binary inputs (S2/S1/S0), selecting among eight discrete falling thresholds - for LTC2935IDC-1, these range from 2.40V to 3.30V (LTC2935-1 variant).

It features a manual reset input (MR) with internal 900kΩ pull-up, 20μs minimum pulse width requirement, and 2–20μs propagation delay to RST. Outputs RST and PFO are open-drain, supporting external pull-up voltages up to 5.5V, and tolerate VCC as low as 1V for valid output behavior.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package), exposed pad (optional GND connection), RoHS-compliant, –40°C to +85°C operating range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935IDC-1, LTC2934IDC-1 trades pin-select simplicity for analog adjustability, while LTC2915IDC-1 extends threshold resolution without altering board design - both retain identical thermal, timing, and power characteristics for drop-in evaluation.

Availability

LTC2935IDC-1 is available at Aetrix Electronics and suitable for battery-powered portable equipment, wireless sensor nodes, security system peripherals, and point-of-sale terminals requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LTC2935IDC-1 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 continuity, technical documentation, and manufacturing for the LTC portfolio.

The LTC2935IDC-1 belongs to Linear's ultra-low-power supervisor family, designed specifically for energy-constrained applications where nanoscale current draw, precise voltage monitoring, and deterministic reset timing are mandatory.

FAQ

What is the exact reset threshold range supported by LTC2935IDC-1?

The LTC2935IDC-1 supports eight discrete reset thresholds ranging from 2.40V to 3.30V, configured via S2/S1/S0 pins. These values correspond to the LTC2935-1 variant (open-drain outputs) and are specified with ±1.5% max accuracy over –40°C to +85°C. The lowest threshold is 2.40V (S2=High, S1=High, S0=High), and the highest is 3.30V (S2=Low, S1=Low, S0=Low).

Does LTC2935IDC-1 require external components for basic operation?

No - LTC2935IDC-1 operates reliably with only a 0.1μF ceramic capacitor between VCC and GND. No external resistors are needed for threshold setting (pin-selectable), timing (200ms internal timeout), or output pull-ups (open-drain outputs support user-defined external pull-ups). This minimizes BOM count and board area in space-constrained designs.

How does the power-fail output (PFO) behave relative to the reset output (RST) in LTC2935IDC-1?

In LTC2935IDC-1, the PFO threshold is fixed at +120mV above the selected reset threshold (e.g., 3.15V PFO with 3.00V RST). PFO pulls low first during VCC droop, providing early warning; RST pulls low only when VCC crosses the lower reset threshold. Upon recovery, PFO releases when VCC exceeds its threshold +2.5% hysteresis, and RST releases after VCC exceeds its threshold +5% hysteresis plus 200ms timeout.

Can LTC2935IDC-1 operate with VCC below 2.0V?

Yes - LTC2935IDC-1 functions down to VCC = 1V. At 1V, RST and PFO outputs remain valid (VOL ≤100mV at 200μA load), and internal comparators continue monitoring. This enables supervision of deeply discharged batteries or low-voltage logic rails where other supervisors fail to assert reset.

What is the purpose of the exposed pad on the LTC2935IDC-1 DFN package?

The exposed pad on the LTC2935IDC-1 DFN package is electrically connected to GND and serves as a thermal and electrical enhancement. It may be left floating or soldered to a PCB ground plane to improve thermal dissipation and reduce θJA (from 102°C/W to lower effective value). No electrical functionality depends on its connection, but grounding it improves long-term reliability under sustained load.