Texas Instruments TLC7733QPWR

Overview

TLC7733QPWR from Texas Instruments is a micropower supply voltage supervisor IC with fixed 2.93 V threshold, active-low RESET output, programmable delay via external capacitor, and operation over –40°C to 125°C. It provides power-on reset generation, undervoltage supervision, and power-down control for static RAM with battery backup in microprocessor systems.

For engineers reviewing the TLC7733QPWR datasheet, TLC7733QPWR pinout, TLC7733QPWR application, or TLC7733QPWR equivalent, this page delivers verified specifications, DRB-package pin mapping, real-world use cases in medical imaging and industrial control, and validated alternative options for voltage monitoring designs requiring high-temperature reliability and ultra-low quiescent current.

Technical Context

The TLC7733QPWR implements a precision bandgap-based voltage reference with temperature compensation to maintain stable 2.93 V sensing across –40°C to 125°C. Its internal timer generates a user-programmable reset delay (td = 2.1 × 10⁴ × CT) after SENSE voltage recovers above threshold.

It features dual-output logic: active-low RESET and active-high RESET, both asserted when VDD ≥1 V and SENSE < 2.93 V. The CONTROL input enables RAM power-down mode by configuring RESET polarity and enabling chip-select disable during brownout.

Key Specifications

Pinout & Package

Package: 8-pin 3×3 mm SON (DRB) - thermally enhanced, space-efficient, RoHS-compliant surface-mount package with exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326LT33D3+T, the TLC7733QPWR uniquely combines programmable delay, dual-reset outputs, and SRAM power-down control in a high-temp qualified DRB package-making it optimal for mission-critical embedded systems requiring deterministic recovery and data retention.

Availability

TLC7733QPWR is available at Aetrix Electronics and suitable for medical imaging equipment, industrial PLCs, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TLC7733QPWR 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 power-supply monitoring in microcomputer systems-prioritizing low power, wide temperature operation, and integrated power-down logic for battery-backed memory.

FAQ

What is the exact threshold voltage of the TLC7733QPWR and how stable is it over temperature?

The TLC7733QPWR has a nominal negative-going input threshold voltage (VIT–) of 2.93 V, with a typical hysteresis of 70 mV. Over its full operating range of –40°C to +125°C, the threshold remains within ±1.2% of nominal due to an integrated temperature-compensated voltage reference-verified per TI's SLVS087M datasheet electrical characteristics table.

How does the CONTROL pin function in the TLC7733QPWR, and what is its recommended voltage level?

In the TLC7733QPWR, the CONTROL pin selects supervisor mode: tied to GND, it configures RESET as active-high for SRAM chip-select control during power failure; tied to VDD, it enables standard active-low reset behavior. Per the datasheet, VIH ≥ 0.7×VDD and VIL ≤ 0.2×VDD define valid logic levels, with best practice being direct connection to GND or VDD via low-impedance paths.

Can the TLC7733QPWR be used with a 1.8 V supply rail, and what happens to RESET assertion?

No-the TLC7733QPWR requires a minimum VDD of 2 V per its recommended operating conditions. At 1.8 V, the device will not power up correctly; RESET may remain indeterminate or inactive. However, once VDD reaches ≥1 V, RESET is guaranteed active-so the part ensures early reset assertion during ramp-up from 2 V, not 1.8 V.

What is the maximum value of external capacitor (CT) supported for delay programming in the TLC7733QPWR?

The TLC7733QPWR supports CT values that yield delay times from ~1.1 ms to several seconds, with no absolute upper limit specified-but practical constraints apply. For example, a 1 µF capacitor yields td ≈ 21 ms; larger values increase leakage sensitivity and PCB area. TI recommends ceramic capacitors with X7R dielectric and tight tolerance (±10%) for stable timing across temperature.

Is the TLC7733QPWR pin-compatible with other members of the TLC77xx family, such as TLC7705QPWR?

Yes-the TLC7733QPWR shares identical 8-pin DRB package dimensions, pinout, and footprint with all TLC77xxQPWR variants (e.g., TLC7705QPWR, TLC7703QPWR). Only the threshold voltage differs (2.93 V vs. 4.55 V or 2.63 V); all electrical timing, drive strength, and functional pins are identical, enabling drop-in replacement in layout-constrained designs.