Analog Devices Inc. LTC2903CS6-D1#TRPBF

Overview

LTC2903CS6-D1#TRPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in 6-lead TSOT-23 package, designed to supervise four voltage rails with one fixed 3.3V (±5%) threshold on V1 and three adjustable thresholds (0.5V reference) on V2, V3, and V4. It delivers ±1.5% threshold accuracy over temperature, 200ms reset timeout, active-low open-drain RST output, and ultralow 20µA quiescent current. It is used in multivoltage embedded systems requiring reliable power-up sequencing and brownout detection.

For engineers reviewing the LTC2903CS6-D1#TRPBF datasheet, LTC2903CS6-D1#TRPBF pinout, LTC2903CS6-D1#TRPBF application, or LTC2903CS6-D1#TRPBF equivalent, key selection criteria include its triple-adjustable-input architecture, guaranteed 0.5V reference-based trip point accuracy, V1-derived internal VCC generation, low-voltage RST pull-down capability down to 0.5V, and compatibility with high-noise industrial power rails.

Technical Context

The LTC2903CS6-D1#TRPBF implements four independent comparators referenced to a bandgap-derived 0.5V internal reference for V2/V3/V4, while V1 uses a dedicated 3.086V (3.3V ±5%) threshold. Its internal VCC is sourced exclusively from V1, enabling operation even when other inputs are unpowered. The reset logic holds RST low until all four inputs exceed their thresholds for 200ms, with glitch immunity achieved via comparator transient integration and reset timeout filtering.

Unlike A1/B1/C1 variants, this D1 version disables V2/V3/V4 fixed thresholds and configures them as adjustable inputs using external resistor dividers. Its RST output features an internal weak pull-up to V1 (not V2), and its low-voltage pull-down circuit sustains sink capability down to VCC = 0.5V with VOL ≤150mV at 5µA sink current.

Key Specifications

Pinout & Package

Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant, footprint compatible with standard SOT-23 land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2903CS6-E1#TRPBF, the LTC2903CS6-D1#TRPBF offers lower primary threshold for 3.3V-centric designs, while differing from LTC2900CS6#TRPBF by enabling precise custom rail supervision instead of fixed-voltage selection-critical for mixed-voltage ASIC/FPGA platforms.

Availability

LTC2903CS6-D1#TRPBF is available at Aetrix Electronics and suitable for industrial automation, optical networking, medical imaging, and automotive ADAS applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across temperature.

Supply support for LTC2903CS6-D1#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 acquired Linear Technology in 2017 and maintains full product continuity, documentation, and technical support for the LTC portfolio.

The LTC2903 family was designed specifically for high-accuracy, low-power multirail supervision in space-constrained embedded systems-emphasizing threshold stability, noise immunity, and flexible input configuration without sacrificing small-footprint packaging.

FAQ

What is the exact reset threshold voltage for V1 on the LTC2903CS6-D1#TRPBF?

The LTC2903CS6-D1#TRPBF has a guaranteed V1 threshold of 3.086V (3.3V ±5%) over the full operating temperature range. This value is specified as the typical trip point with minimum 3.036V and maximum 3.135V, ensuring predictable power-on reset timing for 3.3V rails in industrial environments.

How do I configure V2, V3, and V4 for monitoring a 1.2V rail using the LTC2903CS6-D1#TRPBF?

To monitor a 1.2V rail with the LTC2903CS6-D1#TRPBF, connect a resistor divider between the 1.2V supply and GND, with the tap point feeding V2 (or V3/V4). Using the formula VTRIP = 0.5 × (1 + R1/R2), select R1 = 140kΩ and R2 = 100kΩ to achieve a nominal 1.2V trip point. The LTC2903CS6-D1#TRPBF's 0.5V internal reference ensures accuracy within ±0.008V.

Does the LTC2903CS6-D1#TRPBF require external capacitors on all voltage inputs?

The LTC2903CS6-D1#TRPBF requires a minimum 0.1µF ceramic bypass capacitor on V1 only, as it serves as the sole VCC source. External capacitors on V2, V3, and V4 are optional and recommended only in high-noise environments; they do not affect basic functionality but improve noise immunity for the adjustable inputs.

What is the lowest VCC voltage at which the LTC2903CS6-D1#TRPBF guarantees RST output functionality?

The LTC2903CS6-D1#TRPBF guarantees RST output functionality down to VCC = 0.5V, with VOL ≤150mV at 5µA sink current. This ultralow-voltage operation ensures reliable reset assertion during deep brownout conditions where other supervisors fail, making the LTC2903CS6-D1#TRPBF suitable for critical fail-safe applications.

Can the LTC2903CS6-D1#TRPBF be used in place of the LTC2903CS6-A1#TRPBF without board changes?

No, the LTC2903CS6-D1#TRPBF cannot directly replace the LTC2903CS6-A1#TRPBF without board changes. While both share the same 6-lead TSOT-23 package and pinout, the A1 variant monitors fixed 3.3V/2.5V/1.8V/ADJ rails with V2 pull-up to V2, whereas the D1 variant uses V2/V3/V4 as adjustable inputs with internal pull-up to V1-requiring updated resistor networks and potentially revised reset timing analysis.