Diodes Incorporated PT7M6140CLTA3EX

Overview

PT7M6140CLTA3EX from Pericom Semiconductor is a precision ultra-low-power voltage detector IC with 4.0 V threshold (±1.5% at 25°C), N-channel open-drain active-low reset output, and 17 µs propagation delay. It operates from 1.2 V to 5.5 V supply, consumes only 0.9 µA at 3 V, and features 5% internal hysteresis (VTH+ = 1.05 × VTH−). It is used for battery voltage monitoring and power-on reset in portable medical sensors and low-power IoT edge nodes.

For engineers reviewing the PT7M6140CLTA3EX datasheet, PT7M6140CLTA3EX pinout, PT7M6140CLTA3EX application, or PT7M6140CLTA3EX equivalent, key selection criteria include detection accuracy over temperature (±2.5% typ), SOT23-3 package compatibility, open-drain drive capability (1 mA sink), and guaranteed operation across −40°C to +85°C industrial range.

Technical Context

This device integrates a precision bandgap reference, comparator, and internally trimmed resistor network to set a fixed 4.0 V detection threshold. Hysteresis is implemented via internal feedback, yielding VTH+ = 4.2 V (1.05 × 4.0 V) to prevent oscillation during slow-rising supply transitions.

The N-channel open-drain output requires an external pull-up resistor and supports interfacing with 1.8 V–5 V logic families. Propagation delay is tightly specified at 17 µs (typ) with no minimum timeout period, enabling fast response to brownout events without latency penalties.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB40DBZR and APX803L-40SA-7, PT7M6140CLTA3EX delivers the fastest propagation delay (17 µs) and lowest temperature drift (±2.5% typ), making it optimal for high-reliability embedded systems where deterministic reset timing and thermal stability are critical.

Availability

PT7M6140CLTA3EX is available at Aetrix Electronics and suitable for battery management, industrial sensor supervision, and portable medical diagnostics requiring stable component supply and long-term lifecycle support.

Supply support for PT7M6140CLTA3EX 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) designs high-performance analog and mixed-signal ICs for timing, interface, and power management applications.

The PT7M61xx series targets ultra-low-power voltage monitoring in space-constrained, battery-operated systems-emphasizing accuracy, minimal quiescent current, and robust thermal performance without external components.

FAQ

What is the exact detection threshold voltage and its tolerance for PT7M6140CLTA3EX?

The PT7M6140CLTA3EX has a nominal detection threshold (VTH−) of 4.0 V 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 nominal value, meaning VTH− remains within 3.9 V to 4.1 V under worst-case conditions.

Does PT7M6140CLTA3EX 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). Typical pull-up values range from 10 kΩ to 100 kΩ depending on rise-time requirements and bus loading; the device sinks up to 1 mA when asserted.

Can PT7M6140CLTA3EX operate reliably with a 1.5 V supply?

No. The absolute minimum operating supply voltage is 1.2 V, but the 4.0 V detection threshold requires VCC ≥ 4.0 V to remain above threshold. At 1.5 V, the device powers on but cannot assert reset because VCC is far below VTH−; it is intended for monitoring rails ≥ 4.0 V, not for operation at sub-threshold supplies.

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

Hysteresis is fixed at 5%: VTH+ = 1.05 × VTH− = 4.2 V. When VCC falls below 4.0 V, RST asserts low; it remains low until VCC rises above 4.2 V. This prevents repeated toggling during slow or noisy supply recovery, eliminating the need for external RC filtering and improving system stability during marginal power conditions.