Diodes Incorporated PT7A7513WEX

Overview

PT7A7513WEX from Diodes Incorporated is a precision microprocessor (μP) supervisor IC with 3.08V reset threshold, active-low RESET output, 200ms reset pulse width, debounced manual reset input, and integrated watchdog timer (1.6s timeout). It monitors V_CC during power-up/down/brownout and provides low-battery detection via 1.25V PFI comparator - used in embedded microcontroller systems requiring reliable power sequencing and fault recovery.

For engineers reviewing the PT7A7513WEX datasheet, PT7A7513WEX pinout, PT7A7513WEX application, or PT7A7513WEX equivalent, key selection criteria include reset threshold accuracy (±1.5%), guaranteed RESET validity down to V_CC = 1.2V, WDI/WDO watchdog interface timing, PFO power-fail alert capability, and SOIC-8 package compatibility with industrial PCB layouts.

Technical Context

The PT7A7513WEX implements a precision bandgap-based voltage monitor with 3.08V nominal reset threshold (±1.5% over −40°C to +85°C), enabling robust brownout detection for 3.3V systems. Its internal 200ms one-shot timer ensures consistent reset assertion duration independent of supply ramp rate.

It integrates a 1.6s watchdog timer with edge-sensitive WDI input and open-drain WDO output, plus a dedicated 1.25V reference-based PFI comparator driving push-pull PFO - all operating down to V_CC = 1.2V, supporting ultra-low-voltage system monitoring without external biasing.

Key Specifications

Pinout & Package

PT7A7513WEX is housed in an 8-pin SOIC (W) package (150mil width), RoHS-compliant, halogen-free, and qualified for industrial temperature range (−40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT31D3+ and TPS3808G33DBVR, PT7A7513WEX uniquely combines 3.08V precision reset, integrated watchdog, and 1.25V PFI comparator in a single SOIC-8 package - eliminating three discrete functions and reducing BOM count while maintaining full industrial temperature support.

Availability

PT7A7513WEX is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle assurance.

Supply support for PT7A7513WEX 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, automotive, and consumer markets.

The PT7A75xx family targets μP system reliability enhancement by integrating precision voltage monitoring, reset timing, watchdog supervision, and power-fail detection - designed specifically for embedded systems where deterministic power sequencing and fault recovery are mission-critical.

FAQ

What is the minimum V_CC required for PT7A7513WEX to assert a valid RESET signal?

The device guarantees RESET output validity down to V_CC = 1.2V, with VOL ≤ 0.3V at 100µA sink current. Below this voltage, internal comparators and timers may cease operation, but RESET remains asserted low until V_CC drops below 1.0V. This ensures fail-safe behavior during deep undervoltage events such as battery depletion or catastrophic supply failure.

Can the watchdog timer be disabled without removing the WDI connection?

Yes - the watchdog timer is automatically disabled when WDI is left floating or driven into high-impedance (e.g., tri-stated GPIO). In this state, WDO remains high unless V_CC falls below the reset threshold, effectively converting WDO into a low-line indicator. No external pull-up or configuration register is needed to disable the function.

How does the PFI input function when not used in the application?

When unused, PFI must be tied either to GND or V_CC to prevent floating input noise from falsely triggering PFO. Connecting to GND forces PFO high; connecting to V_CC forces PFO low. The datasheet explicitly prohibits leaving PFI unconnected, as its 2.0µA max input current and 1.25V reference make it susceptible to ESD-induced false trips.

Is PT7A7513WEX qualified for automotive applications per AEC-Q100?

No - PT7A7513WEX is specified for industrial temperature range (−40°C to +85°C) and is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., PT7A7513WEX-A) with PPAP documentation, IATF 16949 manufacturing, and extended qualification testing; those parts carry explicit "A" suffix and automotive-grade top marking.