Texas Instruments TL7757IPKG3

Overview

TL7757IPKG3 from Texas Instruments is a precision supply-voltage supervisor IC designed for microcomputer and microprocessor system reset management. It monitors VCC for undervoltage conditions, asserts active-low RESET below 4.55 V ±120 mV threshold, features 20 µA standby current, 20 mA output sink capability, and operates across −40°C to +85°C. It is used in embedded controllers requiring reliable power-on and brownout reset generation.

For engineers reviewing the TL7757IPKG3 datasheet, TL7757IPKG3 pinout, TL7757IPKG3 application, or TL7757IPKG3 equivalent, key selection criteria include its fixed 4.55 V detection threshold, SOT-89-3 package, −40°C to +85°C industrial temperature range, low quiescent current, and open-drain RESET output with hysteresis.

Technical Context

The TL7757IPKG3 implements an internal precision voltage comparator with built-in hysteresis (30–70 mV) to prevent oscillatory resets during slow VCC transitions. Its reset logic activates when VCC falls below VIT− (4.4 V to 4.7 V) and remains asserted until VCC exceeds VIT+ (≈4.6 V), ensuring clean release after recovery.

It features a power-up reset generator that guarantees RESET assertion down to VCC = 1 V, enabling robust initialization even under marginal supply ramp conditions. The device uses bipolar process technology and contains 27 transistors and 20 resistors in its internal schematic, delivering stable performance without external components.

Key Specifications

Pinout & Package

SOT-89-3 (PK) package: 3-pin surface-mount plastic package with tab connected to GND; compact footprint (4.91 mm × 4.52 mm × 1.9 mm), moisture sensitivity level 2, reflow compatible up to 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7757IPKG3, TPS3808G33DBVR offers programmability and lower IQ but adds design complexity, while MAX809SEUR+T serves 3.3 V systems with tighter footprint but cannot replace TL7757IPKG3 in 5 V applications without circuit redesign.

Availability

TL7757IPKG3 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical device applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL7757IPKG3 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 specializing in analog, embedded processing, and digital signal technologies, with decades of experience in high-reliability power management and supervisory ICs.

The TL77xx family was engineered for cost-effective, single-function voltage supervision in resource-constrained microcontroller systems-prioritizing precision, low power, and robustness over feature richness.

FAQ

What is the exact reset threshold voltage of the TL7757IPKG3?

The TL7757IPKG3 has a nominal negative-going input threshold voltage (VIT−) of 4.55 V with a tolerance of ±120 mV, specified over the full operating temperature range of −40°C to +85°C. This fixed threshold is factory-trimmed and does not require external components to set.

Does the TL7757IPKG3 require an external pull-up resistor on the RESET pin?

Yes, the TL7757IPKG3 features an open-drain RESET output and requires an external pull-up resistor to the host logic rail (e.g., 3.3 V or 5 V). Typical values range from 4.7 kΩ to 10 kΩ, selected based on rise time requirements and bus capacitance.

Can the TL7757IPKG3 operate with supply voltages below 1 V?

No-the TL7757IPKG3 guarantees RESET assertion only down to VCC = 1 V (maximum power-up reset voltage). Below 1 V, internal circuitry is not functional, and RESET state is undefined. Operation is specified from VCC = 1 V to 7 V.

What is the thermal performance of the TL7757IPKG3 in SOT-89 package?

The TL7757IPKG3 in SOT-89 (PK) package has a thermal impedance θJA of 52°C/W. With proper PCB copper area connected to the GND tab, it supports continuous operation at full rated current across −40°C to +85°C ambient without derating.

Is the TL7757IPKG3 pin-compatible with other members of the TL77xx family?

No-TL7757IPKG3 uses the 3-pin SOT-89 (PK) package, while TL7757CD/ID variants use 8-pin SOIC (D). Pin count, layout, and terminal assignment differ fundamentally; no mechanical or electrical pin compatibility exists between PK and D packages.