Diodes Incorporated PT7A7513WE

Overview

PT7A7513WE from Diodes Incorporated is a precision μP supervisor IC with 3.08V reset threshold, active-low RESET output, 200ms reset pulse width, and integrated watchdog timer (1.6s timeout). It monitors V_CC during power-up/down/brownout, provides manual reset input (MR), and features a 1.25V power-fail comparator (PFI/PFO) for low-battery detection in embedded microcontroller systems.

For engineers reviewing the PT7A7513WE datasheet, PT7A7513WE pinout, PT7A7513WE application, or PT7A7513WE equivalent, key selection criteria include reset threshold accuracy (±1.5%), guaranteed RESET validity down to V_CC = 1.2V, TTL/CMOS-compatible MR input, WDI edge-sensitive watchdog interface, and SOIC-8 packaging for space-constrained industrial control boards.

Technical Context

The PT7A7513WE implements a precision bandgap-based voltage monitor with 3.08V nominal reset threshold (±1.5% over −40°C to +85°C), enabling reliable brownout detection for 3.3V systems. Its internal 200ms one-shot timer ensures stable reset assertion independent of supply ramp rate.

It integrates a 1.25V reference-based power-fail comparator (PFI input, PFO output) and a 1.6s watchdog timer triggered by WDI state transitions - both functional across full operating temperature range. RESET remains valid down to V_CC = 1.2V, supporting low-voltage microcontroller initialization sequences.

Key Specifications

Pinout & Package

PT7A7513WE is housed in an 8-pin SOIC (W) package (150mil width), RoHS-compliant, halogen-free, and qualified for industrial temperature operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT31D3+T and TPS3808G33DBVR, PT7A7513WE uniquely combines 3.08V precision reset, integrated 1.25V power-fail detection, and edge-triggered watchdog in a single SOIC-8 package - eliminating discrete components needed for dual-rail supervision in cost-sensitive industrial designs.

Availability

PT7A7513WE is available at Aetrix Electronics and suitable for industrial PLCs, smart meters, automotive body controllers, and portable medical devices requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for PT7A7513WE 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 series targets microprocessor supervision in resource-constrained embedded systems, delivering precision voltage monitoring, manual reset, watchdog, and power-fail detection in minimal footprint - optimized for cost-sensitive, high-volume industrial control applications.

FAQ

Can PT7A7513WE supervise a 3.3V microcontroller with tight supply tolerance?

Yes. Its 3.08V reset threshold (±1.5%) is specifically calibrated for 3.3V systems, triggering reset before the µP's minimum operating voltage (typically 2.7V–3.0V). The 200ms pulse width exceeds JEDEC JESD78 requirements for most ARM and RISC-V cores, ensuring reliable initialization even under noisy supply conditions.

How does the manual reset (MR) input handle switch bounce?

The MR pin incorporates intrinsic debouncing via its 250µA internal pull-up and 140ms minimum reset pulse width. When a mechanical switch pulls MR low, the resulting reset pulse is guaranteed ≥140ms - longer than typical contact bounce duration (1–10ms) - eliminating need for external RC filtering or firmware debouncing logic.

Is the watchdog timer functional when V_CC drops below the reset threshold?

No. The watchdog timer is disabled when V_CC falls below the 3.08V reset threshold - WDO goes low synchronously with RESET and remains low until V_CC recovers. This prevents spurious timeouts during brownout, ensuring only valid µP activity (under stable supply) resets the watchdog.

What is the maximum sink current capability of the PFO output?

PFO is rated for 20mA DC output current per Absolute Maximum Ratings. In typical operation with 1.25V PFI threshold and V_CC = 3.3V, it sinks ≤100µA when active low - sufficient to drive LED indicators or CMOS inputs without external buffering, while maintaining <0.3V saturation voltage at 1mA load.