Texas Instruments TL7757CLPE3

Overview

TL7757CLPE3 from Texas Instruments is a supply-voltage supervisor and precision voltage detector designed for microcomputer and microprocessor systems. It monitors V_CC for undervoltage conditions, asserts active-low RESET below 4.55 V ±120 mV threshold, operates down to 1 V supply, delivers 20 mA sink capability, and features 50 mV typical hysteresis to prevent erratic resets - used in embedded power-up sequencing and brownout protection.

For engineers reviewing the TL7757CLPE3 datasheet, TL7757CLPE3 pinout, TL7757CLPE3 application, or TL7757CLPE3 equivalent, this page provides verified technical context, real-world design meaning of specifications, TO-92 package terminal mapping, application-specific role definitions, and two validated alternative parts with documented functional and thermal differences.

Technical Context

The TL7757CLPE3 implements a comparator-based voltage detection architecture with internal resistor divider and hysteresis network to generate a precise, temperature-stable reset signal. Its threshold is fixed at 4.55 V ±120 mV (−40°C to 85°C), and it guarantees defined RESET output behavior even when V_CC rises above 1 V.

It uses bipolar transistor circuitry (27 transistors, 20 resistors) to achieve low standby current (20 µA at V_CC = 5.5 V), high output sink strength (20 mA), and fast propagation delay (t_PHL ≤ 5 µs, t_PLH ≤ 5 µs). The device requires no external components for basic operation and supports direct connection to microcontroller reset inputs.

Key Specifications

Pinout & Package

TL7757CLPE3 is housed in a TO-92 (LP) through-hole package with 3 leads, 5.34 mm maximum height, and formed leads for tape-and-reel automated assembly. The tab is electrically connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7757CLPE3, TL7705CP offers tighter 5.0 V threshold accuracy but less flexibility for 4.55 V nominal rails, while TPS3808G01DBVR provides adjustable sensing and nanoamp quiescent current at the cost of added external components and different packaging - making TL7757CLPE3 optimal for cost-sensitive, fixed-threshold 5 V supervision in TO-92 space-constrained layouts.

Availability

TL7757CLPE3 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, consumer set-top boxes, medical patient monitor front-ends, and automotive aftermarket telematics units requiring stable component supply across long production lifecycles.

Supply support for TL7757CLPE3 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.

The TL77xx family was developed to provide robust, low-cost voltage supervision for microcontroller-based systems - emphasizing precision threshold stability, wide operating voltage range, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the TL7757CLPE3?

The TL7757CLPE3 has a negative-going input threshold voltage (V_IT−) of 4.55 V ±120 mV over its operating temperature range (0°C to 70°C), with typical hysteresis of 50 mV. This means RESET goes active low when V_CC falls below 4.43 V and releases when V_CC rises above 4.67 V, ensuring noise-immune operation. The value is factory-trimmed and specified in the SLVS041I datasheet.

Does the TL7757CLPE3 require an external pull-up resistor on the RESET pin?

Yes, the TL7757CLPE3 features an open-drain RESET output that must be pulled up externally - typically with a 4.7 kΩ to 10 kΩ resistor to the same 5 V supply being monitored. This configuration allows wired-OR reset combining and ensures proper logic-high level when the output is inactive. The device itself does not include an internal pull-up.

Can the TL7757CLPE3 operate reliably at V_CC = 1.2 V?

No - while the TL7757CLPE3 guarantees defined RESET output behavior when V_CC exceeds 1 V, its recommended operating supply range is 1 V to 7 V, and functional performance (e.g., threshold accuracy, propagation delay) is only specified from V_CC = 4.3 V upward. At 1.2 V, RESET will be asserted but timing and voltage margin are not characterized.

What is the thermal resistance (θ_JA) of the TL7757CLPE3 in its TO-92 package?

The TL7757CLPE3 in the TO-92 (LP) package has a junction-to-ambient thermal resistance (θ_JA) of 140°C/W under standard JEDEC test conditions. This value assumes no copper pour or heatsinking; actual board-level θ_JA improves significantly with GND pad copper area and airflow, especially given the device's low 20 µA typical supply current.

Is the TL7757CLPE3 RoHS compliant and lead-free?

Yes, the TL7757CLPE3 is RoHS compliant and features Sn (tin) lead finish per TI's official packaging addendum. It meets JEDEC J-STD-020 moisture sensitivity Level-1 (unlimited floor life at ≤30°C/85% RH) and is rated for reflow peak temperatures up to 260°C, making it compatible with standard lead-free PCB assembly processes.