Diodes Incorporated PT7M6129CLTA3EX

Overview

PT7M6129CLTA3EX from Pericom Semiconductor is a precision ultra-low-power voltage detector with 2.9V 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 battery or system supply rails in portable electronics, ensuring reliable power-on reset and brownout protection.

For engineers reviewing the PT7M6129CLTA3EX datasheet, PT7M6129CLTA3EX pinout, PT7M6129CLTA3EX application, or PT7M6129CLTA3EX equivalent, key selection criteria include detection accuracy over temperature (±2.5% typ), propagation delay (17µs), hysteresis (5%), operating voltage range (1.2–5.5V), and compatibility with 1.8–5.0V nominal supplies in 100mV steps.

Technical Context

The device integrates a precision bandgap reference, comparator, and internally trimmed resistor network to set VTH− = 2.9V with 5% hysteresis (VTH+ = 3.045V). Threshold accuracy is maintained across −40°C to +85°C via internal compensation.

Its N-channel open-drain output requires an external pull-up and asserts low when VCC falls below VTH−, releasing only after VCC rises above VTH+. Propagation delay is fixed at 17µs with no external timing components needed.

Key Specifications

Pinout & Package

SOT23-3 package: compact 2.9mm × 1.3mm surface-mount outline with gull-wing leads, JEDEC MO-178AA compliant, 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 PT7M6129CLTA3EX, TLV803EB29DPWR offers lower current and push-pull convenience but sacrifices hysteresis control, while APX803S-29SA-7 trades higher current for automotive qualification-making PT7M6129CLTA3EX optimal for cost-sensitive industrial and portable designs needing precise 2.9V detection with built-in hysteresis.

Availability

PT7M6129CLTA3EX is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart home hub controllers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for PT7M6129CLTA3EX 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 analog and mixed-signal IC designer specializing in timing, interface, and power management solutions for communications and computing markets.

The PT7M61xx series was developed specifically for ultra-low-power voltage monitoring in battery-critical and space-constrained applications, emphasizing accuracy, minimal current draw, and simplified integration.

FAQ

What is the exact detection threshold voltage and its tolerance for PT7M6129CLTA3EX?

The PT7M6129CLTA3EX 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 accuracy degrades to ±2.5% typical, meaning VTH− remains within 2.828V to 2.972V at room temperature and 2.823V to 2.977V across temperature extremes.

Does PT7M6129CLTA3EX require an external pull-up resistor on the RST pin?

Yes - the RST pin is an N-channel open-drain output and must be pulled up externally to a valid logic-high voltage (e.g., VCC or another supply rail). Recommended pull-up values range from 10kΩ to 100kΩ depending on rise-time and bus loading requirements; values below 10kΩ increase current consumption unnecessarily.

Can PT7M6129CLTA3EX operate from 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, the 2.9V detection threshold exceeds 1.8V, meaning it will assert reset continuously and remain latched. It is intended for monitoring rails ≥2.9V, such as 3.0V, 3.3V, or 5.0V systems.

How does the 5% hysteresis affect system behavior during power-up and brownout recovery?

The 5% hysteresis sets VTH+ = 3.045V (1.05 × 2.9V), so the device asserts reset when VCC falls below 2.9V and releases reset only after VCC rises above 3.045V. This prevents chatter during slow-rising or noisy supply conditions and ensures clean, monotonic reset release without multiple toggles during marginal recovery.