Diodes Incorporated PT7M6129NLTA3EX

Overview

PT7M6129NLTA3EX from Pericom Semiconductor is a precision ultra-low-power voltage detector with 2.9V threshold, N-channel open-drain active-low reset output, ±1.5% accuracy at 25°C, 0.9µA supply current at 3V, and 17µs propagation delay. It monitors VCC in battery-powered microcontrollers, PMICs, and embedded power rails to prevent brownout-induced system faults.

For engineers reviewing the PT7M6129NLTA3EX datasheet, PT7M6129NLTA3EX pinout, PT7M6129NLTA3EX application, or PT7M6129NLTA3EX equivalent, key selection criteria include threshold accuracy over temperature (±2.5% typ), hysteresis (5%), SOT23-3 package compatibility, and open-drain drive capability for flexible logic-level interfacing.

Technical Context

This device integrates a precision bandgap reference, comparator, and internally trimmed resistor network to set a fixed 2.9V detection threshold (VTH−) with 1.05× hysteresis (VTH+ = 3.045V). The internal 5% hysteresis prevents output oscillation during slow-rising or noisy supply transitions.

It operates across 1.2V–5.5V supply range and −40°C to +85°C ambient, delivering stable reset assertion when VCC falls below VTH− and release only after VCC exceeds VTH+. Output leakage is ≤1µA, supporting high-impedance pull-up configurations without significant current loss.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC MO-178AA compliant), 2.9mm × 1.3mm footprint, 1.45mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT7M6129NLTA3EX, TLV803EB29DPWR offers lower ICC but sacrifices hysteresis control, while MAX809SEUR+T provides broader industry recognition at the cost of 13× higher quiescent current-making PT7M6129NLTA3EX optimal for energy-constrained, thermally variable designs requiring deterministic hysteresis.

Availability

PT7M6129NLTA3EX is available at Aetrix Electronics and suitable for wearable health monitors, industrial PLC I/O modules, smart meter battery backup circuits, and automotive body control units requiring stable component supply across extended temperature and low-power constraints.

Supply support for PT7M6129NLTA3EX 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

Pericom Semiconductor (now part of Diodes Incorporated) specializes in high-performance analog and mixed-signal ICs for timing, connectivity, and power management applications.

The PT7M61xx series was designed specifically for ultra-low-power voltage monitoring in portable, battery-operated, and thermally demanding embedded systems-emphasizing accuracy, minimal current draw, and robust hysteresis behavior.

FAQ

What is the exact detection threshold voltage and its tolerance for PT7M6129NLTA3EX?

The PT7M6129NLTA3EX has a nominal detection threshold (VTH−) of 2.9V with ±1.5% accuracy at 25°C. Over the full −40°C to +85°C operating range, threshold variation is specified as ±2.5% of the nominal value, meaning actual trip points fall between 2.828V and 2.972V under worst-case conditions.

Can PT7M6129NLTA3EX be used with a 1.8V supply rail?

Yes. The device operates from 1.2V to 5.5V, so it functions correctly on a 1.8V rail. However, its 2.9V threshold means it will assert reset continuously on a 1.8V supply-intended use is monitoring rails ≥2.9V (e.g., 3.0V, 3.3V, or 5.0V domains) where undervoltage detection is meaningful.

What external components are required for basic operation?

Only an external pull-up resistor on the RST pin is required for open-drain operation. Per datasheet guidance, pull-up values between 1kΩ and 510kΩ are acceptable; 10kΩ is typical. No capacitors or additional resistors are needed-the hysteresis, reference, and comparator are fully integrated.

How does the hysteresis function, and what is its design impact?

Hysteresis is fixed at 5%: VTH+ = 1.05 × VTH− = 3.045V. Reset releases only when VCC rises above this upper threshold, preventing oscillation during slow or noisy supply recovery. This eliminates need for external RC networks and ensures clean, chatter-free reset signaling in real-world power environments.