Diodes Incorporated PT7M7803STEX

Overview

PT7M7803STEX from Diodes Incorporated is a precision 2.93V 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 PT7M7803STEX datasheet, PT7M7803STEX pinout, PT7M7803STEX application, or PT7M7803STEX equivalent, key selection criteria include its fixed 2.93V threshold, open-drain RESET output, absence of watchdog or manual-reset logic (per function table), and SOT23-3 package compatibility with space-constrained industrial control and networking power rails.

Technical Context

The PT7M7803STEX implements a voltage-monitoring architecture that asserts RESET when VCC falls below 2.93V ±2.5% across –40°C to +85°C, with hysteresis of 50mV to prevent chatter near threshold. Its internal reset timer guarantees a minimum 140ms (typ. 200ms) active-low pulse after VCC recovers above VRST.

No watchdog or manual-reset functionality is integrated - confirmed by the Function Comparison Table (row 1: all "–" entries for WDI, MR, push-pull, and watchdog columns). The device operates from 1.0V to 5.5V supply and draws only 10–30µA at 5V, enabling ultra-low-power monitoring in battery-backed systems.

Key Specifications

Pinout & Package

PT7M7803STEX is housed in a 3-pin SOT23 plastic package (Package Code T), with 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 voltage supervisor applications.

Compared with APX803S-29SA-7 and TPS3808G12DBVR, PT7M7803STEX uniquely delivers guaranteed RESET assertion down to 1.0V VCC in a minimal 3-pin SOT23 footprint without MR or watchdog overhead - ideal for cost- and space-sensitive brownout-only monitoring.

Availability

PT7M7803STEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, smart meter battery backup, and medical IoT sensor node applications requiring stable component supply and long-term manufacturability.

Supply support for PT7M7803STEX 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.

The PT7M78xx family targets µP system reliability by integrating precision voltage monitoring, reset timing, and optional watchdog/manual-reset functions - with PT7M7803STEX optimized for simple, low-cost brownout detection in resource-constrained embedded designs.

FAQ

What is the exact reset threshold voltage and tolerance for PT7M7803STEX?

The PT7M7803STEX has a nominal reset threshold of 2.93V, with ±2.5% tolerance over the full operating temperature range (–40°C to +85°C), as specified in the DC Electrical Characteristics table. This value is fixed by the "S" suffix in the part number and verified per Diodes Document 43008 Rev 2-4.

Does PT7M7803STEX include a watchdog timer or manual reset input?

No. Per the Function Comparison Table (row 1), PT7M7803STEX has no watchdog input (WDI), no manual reset input (MR), and no push-pull output - it is a dedicated open-drain voltage supervisor with reset timing only. This is confirmed by pin description and block diagram exclusions.

Can PT7M7803STEX operate reliably below 1.8V supply voltage?

Yes. The datasheet guarantees RESET output validity down to VCC = 1.0V, and the device functions across 1.0V–5.5V. At 1.0V, RESET remains a valid logic low (≤0.4V), enabling use in ultra-low-voltage brownout scenarios where other supervisors fail.

What package type and pin count does PT7M7803STEX use?

PT7M7803STEX uses the SOT23-3 package (Package Code T), with three terminals: VCC (pin 1), GND (pin 2), and open-drain RESET (pin 3). This is confirmed in the Mechanical Information section and Ordering Information table of Document 43008.