Diodes Incorporated PT7M7810RTEX

Overview

PT7M7810RTEX from Diodes Incorporated is a precision microprocessor supervisory circuit with 2.63V reset threshold, 200ms reset pulse width, and manual-reset input-designed to monitor VCC in embedded μP systems during power-up, brownout, and power-down events. It asserts active-low RESET when supply drops below threshold and holds reset for 200ms after recovery, supporting reliable system initialization in industrial controllers and network edge devices.

For engineers reviewing the PT7M7810RTEX datasheet, PT7M7810RTEX pinout, PT7M7810RTEX application, or PT7M7810RTEX equivalent, key selection criteria include guaranteed RESET validity down to VCC = 1.0V, SOT23-3 package compatibility, absence of watchdog or WDI functionality, and fixed 2.63V threshold tolerance (±2.5% over −40°C to +85°C).

Technical Context

The PT7M7810RTEX implements a voltage-monitoring architecture with hysteresis (50mV typical) to prevent oscillation near the reset threshold. Its internal comparator continuously compares VCC against a trimmed bandgap reference, triggering RESET assertion on falling VCC and holding it for a fixed 200ms timeout after VCC rises above VRST.

No watchdog timer or WDI input is present-this part belongs to the "manual-reset only" subgroup (Function Comparison Table, Row 3). It features debounced CMOS-compatible MR input with no internal pull-up (unlike PT7M7811/7812), requiring external pull-up for proper operation.

Key Specifications

Pinout & Package

SOT23-3 plastic package (3-pin, 1.3mm × 2.9mm × 1.1mm body, 0.95mm pitch), lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PT7M7810RTEX, TPS3808G18DBVR offers tighter threshold accuracy but lacks MR support and targets lower-voltage rails, while MAX809SEUR+T provides faster release but cannot supervise 2.63V rails or enable field service reset-making PT7M7810RTEX uniquely suited for 2.6V–2.8V industrial μP systems requiring manual intervention.

Availability

PT7M7810RTEX is available at Aetrix Electronics and suitable for industrial PLC controllers, network edge routers, smart surveillance cameras, and secure access panels requiring stable component supply under extended temperature and brownout conditions.

Supply support for PT7M7810RTEX 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-specifically designed to replace discrete reset circuits with integrated, precision voltage monitoring, manual reset, and guaranteed low-VCC operation in space-constrained embedded designs.

FAQ

What is the exact reset threshold voltage and its tolerance for PT7M7810RTEX?

The PT7M7810RTEX has a nominal reset threshold of 2.63V, with ±2.5% tolerance over the full operating temperature range (−40°C to +85°C). This value is laser-trimmed during production and verified per DC Electrical Characteristics table (Page 5, VRST row for R-suffix parts). It is not adjustable and does not vary with supply voltage.

Does PT7M7810RTEX include a watchdog timer or WDI input?

No. PT7M7810RTEX is explicitly designated in the Function Comparison Table (Row 3) as having no watchdog input (WDI) or watchdog timer functionality. It provides only power-supply monitoring and manual reset-distinguishing it from PT7M7811, PT7M7812, and PT7M7823–25 variants.

What is the RESET output configuration and drive capability?

PT7M7810RTEX features an open-drain RESET output. It sinks up to 1.2mA at VCC ≥ 2.7V with VOL ≤ 0.3V, and supports external pull-up to any voltage ≤ 5.5V. It does not provide push-pull drive or active-high RESET-only active-low open-drain assertion.

Is there an internal pull-up resistor on the MR pin?

No. Unlike PT7M7811/7812 (which integrate 10–40kΩ pull-ups), PT7M7810RTEX has no internal MR pull-up. The MR pin is a CMOS input requiring an external pull-up resistor (typically 10–100kΩ to VCC) to ensure defined logic-high state when unused or interfaced with push-button switches.