Diodes Incorporated PT7M7812LTBE

Overview

PT7M7812LTBE from Diodes Incorporated is a precision microprocessor (μP) supervisor IC with 4.63V reset threshold, 200ms reset pulse width, debounced manual-reset input, and watchdog timer functionality. It monitors V_CC in embedded μP systems, asserts active-low push-pull RESET during power-up/brownout, and supports manual reset and watchdog timeout detection for system reliability in industrial controllers and network edge devices.

For engineers reviewing the PT7M7812LTBE datasheet, PT7M7812LTBE pinout, PT7M7812LTBE application, or PT7M7812LTBE equivalent, this device delivers deterministic reset timing, guaranteed RESET validity down to V_CC = 1.0V, internal MR pull-up (10–40 kΩ), and ±1.5% threshold accuracy at 25°C - critical for fail-safe boot sequencing and brownout recovery in safety-aware embedded designs.

Technical Context

The PT7M7812LTBE implements a dual-function supervisory architecture: a precision voltage monitor with hysteresis (±2.5% over –40°C to +85°C) and a 1.6s watchdog timer triggered by WDI edge transitions. Its reset generator guarantees RESET assertion until V_CC exceeds VRST and holds for 200ms post-threshold crossing.

It features a CMOS-compatible manual-reset input (MR) with internal pull-up and debounced response, and an active-low push-pull RESET output capable of sinking 3.2mA at V_CC ≥ 4.5V. The device operates across 1.0V–5.5V supply range and remains functional down to V_CC = 1.0V, enabling robust low-voltage supervision.

Key Specifications

Pinout & Package

SOT23-5 package (3.0mm × 1.7mm × 1.3mm body, 0.95mm pitch), lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G33DBVR, PT7M7812LTBE uniquely combines 4.63V precision threshold, integrated WDI and MR, and guaranteed 1.0V operation - making it the sole fit for 5V μP systems requiring full-featured, self-contained supervision without external components.

Availability

PT7M7812LTBE is available at Aetrix Electronics and suitable for industrial PLC controllers, network edge routers, server BMC modules, and smart surveillance DVRs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PT7M7812LTBE 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and communications markets.

PT7M7812LTBE belongs to the PT7M78xx family of μP supervisors, designed specifically to reduce component count and improve boot reliability in space-constrained embedded systems with multi-rail power architectures.

FAQ

Does PT7M7812LTBE support watchdog functionality?

Yes. PT7M7812LTBE includes a 1.6s watchdog timer that monitors the WDI input. If WDI remains static (high or low) beyond the timeout period, the device asserts RESET. Edge transitions on WDI clear the timer, and pulses as short as 150ns are reliably detected. The watchdog can be disabled by leaving WDI unconnected or floating it via a high-impedance buffer.

What is the minimum V_CC at which RESET remains valid?

RESET output is guaranteed valid down to V_CC = 1.0V. At this voltage, the device maintains correct logic levels: RESET remains low (≤0.4V) during undervoltage, and transitions cleanly after the 200ms timeout once V_CC rises above the 4.63V threshold. This ensures fail-safe behavior even during deep brownout conditions.

Is an external pull-up resistor required on the MR pin?

No. PT7M7812LTBE integrates an internal MR pull-up resistor with a nominal value of 20 kΩ (range 10–40 kΩ). This allows direct connection of a momentary push-button switch between MR and GND without external components. When unused, MR may be left floating or tied to V_CC.

What package type is used for PT7M7812LTBE?

PT7M7812LTBE uses the SOT23-5 package (3.0mm × 1.7mm × 1.3mm body, 0.95mm pin pitch), marked "TA" in Diodes' ordering nomenclature. It is Pb-free, RoHS-compliant, and supplied in tape-and-reel format for automated assembly.