Diodes Incorporated PT7M6127CLTA3EX

Overview

PT7M6127CLTA3EX from Pericom Semiconductor is a precision ultra-low-power voltage detector IC with 2.7V threshold, ±1.5% accuracy at 25°C, 0.9µA supply current at 3V, and N-channel open-drain active-low reset output in SOT23-3 package. It monitors VCC in battery-powered microcontrollers, portable instrumentation, and power management circuits where reliable brown-out detection is required.

For engineers reviewing the PT7M6127CLTA3EX datasheet, PT7M6127CLTA3EX pinout, PT7M6127CLTA3EX application, or PT7M6127CLTA3EX equivalent, key selection criteria include threshold accuracy over temperature (±2.5% typ), propagation delay (17µs), hysteresis (5%), operating voltage range (1.2V–5.5V), and open-drain output compatibility with 3.3V/5V logic systems.

Technical Context

The PT7M6127CLTA3EX integrates a precision bandgap reference, comparator, and internally trimmed resistor network to set a fixed 2.7V detection threshold (VTH−) with 5% hysteresis (VTH+ = VTH− × 1.05). Its internal architecture eliminates external calibration components while maintaining stability across −40°C to +85°C.

It operates as a dedicated power-on reset supervisor: RST asserts low when VCC falls below 2.7V and releases only after VCC rises above 2.835V. The open-drain output supports wired-OR configurations and pull-up to any voltage ≤ VCC, enabling flexible interface with diverse host logic families.

Key Specifications

Pinout & Package

SOT23-3 package (JEDEC MO-178AA compliant), 2.9mm × 1.3mm × 1.0mm body, surface-mount, 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 PT7M6127CLTA3EX, TLV803EB27DBZR offers lower quiescent current but lacks open-drain flexibility, while APX803S-27SA-7 matches the output type and current draw but adds extended temperature support at the cost of slightly reduced accuracy.

Availability

PT7M6127CLTA3EX is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC modules, medical wearables, and automotive body control units requiring stable component supply across long production lifecycles.

Supply support for PT7M6127CLTA3EX 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) is a fabless semiconductor company specializing in high-performance timing, interface, and power management solutions for communications, computing, and industrial markets.

The PT7M61xx series was designed specifically for ultra-low-power voltage monitoring in space-constrained, battery-sensitive applications-emphasizing accuracy, minimal current draw, and integration of hysteresis without external components.

FAQ

What is the exact detection threshold voltage and tolerance for PT7M6127CLTA3EX?

The PT7M6127CLTA3EX has a nominal detection threshold (VTH−) of 2.7V with ±1.5% accuracy at 25°C. Over the full operating temperature range (−40°C to +85°C), the threshold variation is ±2.5% of the typical value, meaning the actual trip point stays within 2.6325V to 2.7675V at room temperature and 2.63V to 2.77V across temperature extremes.

Can PT7M6127CLTA3EX be used with a 1.8V supply rail?

Yes - the device operates from 1.2V to 5.5V, so it can monitor a 1.8V rail. However, its 2.7V threshold means it will assert reset whenever VCC falls below 2.7V; thus, it is not suitable for detecting faults on a 1.8V rail itself. It is appropriate for supervising higher rails (e.g., 3.3V or 5V) that power a 1.8V regulator, ensuring upstream supply integrity before enabling downstream logic.

Does PT7M6127CLTA3EX require an external pull-up resistor on the RST pin?

Yes - because it features an N-channel open-drain output, PT7M6127CLTA3EX requires an external pull-up resistor on the RST pin. Typical values range from 10kΩ to 100kΩ, connected to a logic-compatible voltage (e.g., same as MCU VDD or a higher rail). Without this resistor, RST remains floating and cannot drive a valid high logic level.

How does the built-in hysteresis function in PT7M6127CLTA3EX?

The device implements fixed 5% hysteresis: RST asserts low when VCC falls to 2.7V (VTH−), and releases only when VCC rises to 2.835V (VTH+ = 2.7V × 1.05). This prevents oscillation during slow or noisy supply recovery and eliminates the need for external positive feedback components, simplifying PCB layout and reducing BOM count.