Diodes Incorporated PT7A7613S-13

Overview

PT7A7613S-13 from Diodes Incorporated is a precision microprocessor (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 VCC for power-up/brownout conditions, detects low-battery via 1.25V PFI comparator, and supports manual reset with debounced TTL/CMOS input - deployed in embedded controllers and portable instrumentation requiring reliable power sequencing.

For engineers reviewing the PT7A7613S-13 datasheet, PT7A7613S-13 pinout, PT7A7613S-13 application, or PT7A7613S-13 equivalent, key selection criteria include its guaranteed RESET validity down to VCC = 1V, MR pull-up current of 250µA, PFO/PFI interface for power-fail warning, SO-8 package compatibility, and absence of NC pins in this variant.

Technical Context

This supervisor implements a precision bandgap-based voltage monitor with ±2% reset threshold tolerance (3.018V–3.142V at 3.08V nominal), hysteresis of 0.8% VRN, and internal 20kΩ reset divider. Its watchdog circuit triggers WDO low after 1.6s of static WDI state (high or low), cleared automatically on RESET assertion or WDI edge transition.

The device integrates independent analog blocks: a 1.25V reference for PFI comparison (±25mV accuracy), TTL/CMOS-compatible MR input with internal pull-up, and dual-output logic (RESET active-low only, WDO open-drain) optimized for µP NMI and reset line interfacing without external components.

Key Specifications

Pinout & Package

PT7A7613S-13 is housed in an industry-standard SO-8 package (4.90mm × 6.00mm, 1.27mm pitch), RoHS-compliant and halogen-free, with exposed pad not present. Pin functions are validated per Diodes DS41672 Rev. 1–2 (Jan 2019).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UR31-T and TPS3808G33DBVR, PT7A7613S-13 uniquely combines 3.08V precision reset, integrated 1.25V PFI detection, and 1.6s watchdog in SO-8 - delivering full supervisory functionality without external components or threshold compromise.

Availability

PT7A7613S-13 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and smart energy meters requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long-life production programs.

Supply support for PT7A7613S-13 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and protection applications.

The PT7A76xx family belongs to Diodes' µP supervisor product line, designed specifically to replace discrete reset circuits in resource-constrained embedded systems while ensuring robust power-monitoring compliance with JEDEC and IEC 61000 standards.

FAQ

What is the minimum VCC required for RESET output to remain valid?

RESET output is guaranteed functional down to VCC = 1.0V, with VOL ≤ 0.3V at ISINK = 100µA. This ensures deterministic reset assertion during deep brownout events before system power collapse, critical for preserving nonvolatile memory state and preventing undefined processor behavior.

Can the watchdog timer be disabled without removing WDI from the circuit?

Yes - the watchdog timer is automatically disabled when WDI is left floating or connected to a high-impedance (three-state) buffer. In this state, WDO functions solely as a low-line indicator, asserting low only when VCC falls below the 3.08V reset threshold, eliminating risk of spurious timeouts.

Is PFI input compatible with direct connection to a lithium-ion battery?

No - PFI has a fixed 1.25V threshold and cannot tolerate voltages above VCC. To monitor a 3.0–4.2V Li-ion cell, a resistive divider (e.g., 2.2MΩ + 1.0MΩ) must scale battery voltage to ≤1.25V at PFI, with IPFI limited to ±1µA to avoid loading error.

Does PT7A7613S-13 support both SO-8 and MSOP-8 packages?

No - PT7A7613S-13 is specified exclusively in SO-8 packaging (suffix "S"). The MSOP-8 variant is designated PT7A7613M8-13 (suffix "M8"). Pinouts differ: MSOP-8 relocates WDO to pin 7 and omits NC pins, while SO-8 uses pin 8 for WDO and has no NC connections.