Analog Devices Inc. LTC2903IS6-E1#TRPBF

Overview

LTC2903IS6-E1#TRPBF from Analog Devices (acquired Linear Technology) is a precision quad supply monitor IC in 6-lead TSOT-23 package, designed to supervise four voltage rails simultaneously with guaranteed ±1.5% threshold accuracy over temperature. It monitors 5V, ADJ, ADJ, ADJ inputs, features 5% undervoltage detection tolerance, 200ms reset timeout, and active-low open-drain RST output. Used in multivoltage telecom and server power systems requiring reliable brownout detection down to 0.5V VCC.

For engineers reviewing the LTC2903IS6-E1#TRPBF datasheet, LTC2903IS6-E1#TRPBF pinout, LTC2903IS6-E1#TRPBF application, or LTC2903IS6-E1#TRPBF equivalent, key selection criteria include its 5V fixed V1 threshold (4.675V typ), three adjustable inputs referenced to 0.5V internal bandgap, ultralow 20µA quiescent current, SOT-23 footprint compatibility, and guaranteed RST sink capability at VCC = 0.5V.

Technical Context

The LTC2903IS6-E1#TRPBF implements four independent comparators tied to a shared 200ms reset delay timer and low-voltage pull-down circuitry powered solely from V1. Its architecture guarantees RST remains asserted until all four monitored voltages exceed their thresholds for ≥140ms (min) and ≤260ms (max), with glitch immunity achieved via comparator transient integration and reset timeout filtering.

Unlike earlier supervisors, it eliminates hysteresis to preserve ±1.5% threshold accuracy across –40°C to +85°C, using proprietary comparator response tailoring instead. The internal 0.5V reference enables precise external resistor-divider programming of V2/V3/V4 trip points per V_TRIP = 0.5 × (1 + R1/R2), while V1 is fixed at 4.675V (5V, 5% threshold).

Key Specifications

Pinout & Package

6-lead TSOT-23 (S6) package: 1.90mm × 2.80mm × 0.95mm height, low-profile (1mm max), JEDEC MO-193 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-supply monitoring applications.

Compared with LTC2900CS6-5 and LTC2908IDC-5#TRMPBF, the LTC2903IS6-E1#TRPBF uniquely balances fixed 5V supervision with three fully adjustable inputs in the smallest possible SOT-23 footprint, delivering lowest quiescent current and deepest brownout resilience among quad monitors.

Availability

LTC2903IS6-E1#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, network server boards, and industrial PLC controllers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2903IS6-E1#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, Inc. (ADI) acquired Linear Technology in 2017 and continues its legacy of high-performance analog and mixed-signal ICs for precision power, signal chain, and timing applications.

The LTC2903 series belongs to ADI's precision power supervision product line, engineered specifically for multivoltage systems in telecom, computing, and industrial equipment where accurate, low-power, and robust supply monitoring is mission-critical.

FAQ

What is the exact V1 reset threshold voltage for LTC2903IS6-E1#TRPBF?

The LTC2903IS6-E1#TRPBF has a fixed V1 threshold of 4.675V typical (4.600V min, 4.750V max) corresponding to a 5V nominal supply with 5% undervoltage tolerance. This value is guaranteed over the full –40°C to +85°C operating temperature range and is derived from the internal 0.5V bandgap reference scaled by resistor ratios inside the IC.

Can LTC2903IS6-E1#TRPBF monitor negative voltages like –5.2V?

No, LTC2903IS6-E1#TRPBF cannot directly monitor negative voltages. Its V4 pin is rated only from –0.3V to +6.5V, and the E1 variant is configured for positive adjustable inputs. To supervise –5.2V, use the LTC2903-C1 variant (which specifies V4 threshold of –4.602V typical) or add an external level-shifting circuit before connecting to V4.

How does the RST output behave during power-up when V1 ramps slowly?

During slow V1 ramp-up, the LTC2903IS6-E1#TRPBF asserts RST low until V1 exceeds 4.675V and remains above threshold for ≥140ms. Its internal low-voltage pull-down circuit maintains RST < 0.15V even as V1 rises from 0.5V upward, preventing floating states that could cause erratic downstream logic behavior.

What external components are required for basic operation of LTC2903IS6-E1#TRPBF?

For basic operation, LTC2903IS6-E1#TRPBF requires only a 0.1µF ceramic bypass capacitor between V1 and GND. Adjustable inputs (V2/V3/V4) need external resistor dividers to set trip points; no capacitors are mandatory on those pins unless noise is present. An external pull-up resistor on RST is optional but recommended for faster rise times or interfacing with higher-voltage logic.

Is LTC2903IS6-E1#TRPBF pin-compatible with other LTC2903 variants like LTC2903IS6-B1#TRPBF?

Yes, all LTC2903 variants-including LTC2903IS6-E1#TRPBF and LTC2903IS6-B1#TRPBF-share identical 6-lead TSOT-23 (S6) pinout and package dimensions. However, internal threshold configurations differ: E1 uses 5V-fixed + three adjustable inputs, while B1 uses fixed 5V/3.3V/2.5V/1.8V thresholds. Swapping requires verifying external resistor networks and system rail assignments.