Diodes Incorporated PT7M7803RTEX

Overview

PT7M7803RTEX from Diodes Incorporated is a precision 2.63V open-drain microprocessor supervisory circuit with 200ms reset pulse width, guaranteed RESET validity down to VCC = 1.0V, and CMOS-compatible manual-reset input. It monitors power supply integrity during power-up, brownout, and power-down in embedded microprocessor systems, asserting active-low reset for system initialization and fault recovery.

For engineers reviewing the PT7M7803RTEX datasheet, PT7M7803RTEX pinout, PT7M7803RTEX application, or PT7M7803RTEX equivalent, key selection criteria include its 2.63V threshold accuracy (±2.5% over –40°C to +85°C), open-drain RESET output compatibility with mixed-voltage logic, 10µA typical supply current at 5V, and SOT23-3 package suitability for space-constrained industrial and networking control boards.

Technical Context

The PT7M7803RTEX implements a voltage-monitoring architecture with hysteresis (50mV typical) to prevent oscillatory reset assertion near the 2.63V threshold during slow-rising or noisy VCC transitions. Its internal timebase generates a fixed 200ms (140–400ms) reset timeout after VCC exceeds VRST or MR release.

No watchdog or manual-reset debouncing circuitry is integrated - the device provides only core reset supervision: power-on reset, brownout detection, and push-button-initiated reset via MR. The open-drain RESET output requires an external pull-up resistor, enabling level translation and wired-OR configuration with other reset sources.

Key Specifications

Pinout & Package

PT7M7803RTEX is housed in a 3-pin SOT23 plastic package (Package Code T), with gull-wing leads and standard JEDEC MO-178 footprint. Pin 1 = VCC, Pin 2 = GND, Pin 3 = RESET (open-drain output).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with APX803S-26SA-7 and TPS3809K33DBVR, PT7M7803RTEX uniquely balances open-drain flexibility, precise 2.63V trip point, and ultra-low 10µA supply current - making it optimal for cost-sensitive, space-constrained industrial controllers where reset bus sharing and minimal standby load are design priorities.

Availability

PT7M7803RTEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, embedded security gateways, and server BMC monitoring requiring stable component supply and long-term industrial lifecycle support.

Supply support for PT7M7803RTEX 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and protection applications.

The PT7M78xx family targets microprocessor system reliability, delivering precision voltage supervision with minimal external components for industrial, networking, and embedded computing platforms.

FAQ

What is the minimum VCC required for PT7M7803RTEX to assert a valid RESET signal?

The PT7M7803RTEX guarantees RESET output validity down to VCC = 1.0V. At this voltage, RESET remains a logic-low signal (≤0.3V) when asserted, ensuring compatibility with microcontrollers that retain reset functionality at ultra-low supply levels. This specification is verified across the full –40°C to +85°C operating temperature range.

Does PT7M7803RTEX include an internal pull-up resistor on the MR pin?

No, PT7M7803RTEX does not integrate an internal pull-up resistor on the MR pin. The MR input is CMOS-compatible and requires an external pull-up resistor to VCC (typically 10kΩ–100kΩ) to maintain a logic-high idle state. Leaving MR unconnected results in undefined behavior due to floating input.

Can PT7M7803RTEX be used in automotive applications?

PT7M7803RTEX is not AEC-Q100 qualified and is not recommended for automotive applications. Diodes Incorporated explicitly states that automotive-grade variants require specific change control, PPAP capability, and IATF 16949 manufacturing - none of which apply to this part. Use only in industrial, networking, or commercial embedded systems.

What is the maximum sink current capability of the open-drain RESET output?

The RESET output can sink up to 100µA while maintaining VOL ≤0.3V at VCC ≥1.0V, and up to 3.2mA at VCC ≥4.5V with VOL ≤0.4V. These values are specified in the DC Electrical Characteristics table and define the maximum load (e.g., pull-up resistor value and bus capacitance) the output can drive reliably.