Texas Instruments TLC7725QD

Overview

TLC7725QD from Texas Instruments is a micropower supply voltage supervisor IC with fixed 2.25 V sense threshold, operating from 2 V to 6 V supply, delivering precision reset control for microprocessor systems across –40°C to 125°C, and featuring programmable delay via external capacitor for reliable power-on and undervoltage reset in medical imaging and industrial control applications.

For engineers reviewing the TLC7725QD datasheet, TLC7725QD pinout, TLC7725QD application, or TLC7725QD equivalent, key selection criteria include its 2.25 V threshold accuracy, 16 µA max supply current, DRB package compatibility, and dual active-high/active-low reset outputs with power-down support for battery-backed SRAM.

Technical Context

The TLC7725QD implements a precision bandgap-based voltage reference with temperature compensation to maintain stable 2.25 V (±0.07 V) negative-going threshold at SENSE input across full temperature range. Its internal timer generates a user-programmable reset delay (td = 2.1 × 10⁴ × CT) after threshold crossing, ensuring system stability during brownout recovery.

It supports both active-high RESET and active-low RESET outputs, with CONTROL pin enabling SRAM power-down mode when grounded. The device asserts reset when VDD ≥ 1 V and maintains it until SENSE exceeds threshold and delay expires - critical for deterministic boot sequencing in safety-critical embedded systems.

Key Specifications

Pinout & Package

The TLC7725QD is housed in an 8-pin SON (Small Outline No-lead) package, designated DRB, measuring 3 mm × 3 mm × 0.9 mm with wettable flanks and RoHS-compliant NiPdAu lead finish. It features a thermal pad on the bottom for enhanced heat dissipation and is rated MSL-1 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC7725QDR, the TLC7725QD offers identical performance in tube packaging for prototyping and low-volume builds; versus TPS3808G25DBVR, it trades lower quiescent current for greater configurability - including programmable delay, manual reset, and SRAM power-down support - making it suitable for complex, multi-rail embedded systems requiring deterministic sequencing.

Availability

TLC7725QD is available at Aetrix Electronics and suitable for medical imaging, industrial PLCs, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability through TI's authorized channel.

Supply support for TLC7725QD 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

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The TLC77xx family was designed specifically for robust, low-power supply monitoring in mission-critical embedded systems - prioritizing precision threshold stability, wide temperature operation, and flexible reset timing over cost-optimized consumer-grade alternatives.

FAQ

What is the exact sense threshold voltage of the TLC7725QD, and how tightly is it specified?

The TLC7725QD has a nominal sense threshold voltage of 2.25 V, with a guaranteed range of 2.18 V to 2.32 V across the full operating temperature range (–40°C to 125°C) and supply voltage (2 V to 6 V). This specification is confirmed in the Electrical Characteristics table of the SLVS087M datasheet and applies directly to the TLC7725QD variant.

Does the TLC7725QD support both active-high and active-low reset outputs simultaneously?

Yes, the TLC7725QD provides two complementary reset outputs: RESET (active-high) and RESET (active-low). Both are driven simultaneously from the same internal logic state, enabling direct connection to MCUs or peripherals requiring either polarity without external inversion - a feature explicitly documented in the Functional Block Diagram and Logic Symbol of the TLC7725QD datasheet.

How is the reset delay time set on the TLC7725QD, and what capacitor value yields a 200 ms delay?

The reset delay time (td) on the TLC7725QD is set by an external capacitor CT connected between the CT pin and GND, using the formula td = 2.1 × 10⁴ × CT. For a 200 ms delay, CT = 200 × 10⁻³ / 2.1 × 10⁴ ≈ 9.52 nF; a standard 10 nF ceramic capacitor achieves ~210 ms delay, as verified in the Switching Characteristics section of the TLC7725QD datasheet.

Can the TLC7725QD be used to control battery-backed static RAM during main power failure?

Yes, the TLC7725QD supports SRAM power-down control via its CONTROL pin: when CONTROL is tied to GND, the RESET output becomes active-high and can directly drive the chip-select (CS) line of battery-backed SRAM. This function is explicitly described in the Application Information section (Figure 10) of the TLC7725QD datasheet and is part of the device's defined feature set.

What is the package type and pin count of the TLC7725QD, and is it RoHS-compliant?

The TLC7725QD uses the DRB package - an 8-pin SON (Small Outline No-lead) measuring 3 mm × 3 mm - with RoHS-compliant NiPdAu lead finish and MSL-1 rating. This is confirmed in TI's official Packaging Information document and the "Available Options" table of the SLVS087M datasheet, which lists TLC7725QD under the DRB column with "SOIC (D)" mislabeling corrected in later addenda as SON/DRB.