Diodes Incorporated PT7A7533WE

Overview

PT7A7533WE from Diodes Incorporated is a dual-output μP supervisor IC with precision 3.08V supply-voltage monitoring, active-high and active-low reset outputs, 200ms reset pulse width, and integrated power-fail comparator (1.25V threshold). It operates across 3.0V to 5.5V supply range and guarantees RESET/RESET validity down to V_CC = 1.2V - used in embedded microcontroller systems requiring reliable power sequencing and brownout protection.

For engineers reviewing the PT7A7533WE datasheet, PT7A7533WE pinout, PT7A7533WE application, or PT7A7533WE equivalent, key selection criteria include dual-reset polarity support, absence of watchdog timer (vs. PT7A751x/752x), PFI/PFO voltage-monitoring capability, and SOIC-8 packaging for space-constrained industrial control boards.

Technical Context

This device implements a precision bandgap-based reset threshold detector (±1.5% over temperature), a debounced manual reset input with 250µA internal pull-up, and an independent 1.25V reference comparator for external power-fail detection. Its dual-reset architecture enables direct interface with both active-high and active-low reset-input microcontrollers without external logic inversion.

The absence of watchdog functionality distinguishes PT7A7533WE from PT7A751x/752x variants, simplifying timing-critical designs where watchdog supervision is handled externally or omitted. All outputs are TTL/CMOS-compatible, and guaranteed operation begins at V_CC = 1.2V - critical for low-voltage battery-backed systems.

Key Specifications

Pinout & Package

PT7A7533WE is housed in an 8-pin SOIC (W) package (150mil width), RoHS-compliant and halogen-free per Diodes Inc. green standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT31D3+ and TPS3808G33DBVR, PT7A7533WE uniquely delivers simultaneous active-high/active-low reset signaling and integrated 1.25V power-fail detection in SOIC-8 - making it optimal for industrial controllers requiring robust, multi-rail supervision without footprint penalty.

Availability

PT7A7533WE is available at Aetrix Electronics and suitable for industrial PLCs, smart meters, medical handhelds, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for PT7A7533WE 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 microprocessor system reliability - designed specifically to reduce external component count in power-supply monitoring while delivering precision voltage thresholds, dual-reset flexibility, and fail-safe brownout response.

FAQ

Does PT7A7533WE include a functional watchdog timer?

No. Unlike PT7A751x and PT7A752x variants, PT7A7533WE omits the watchdog timer and associated WDI/WDO pins. The WDI and WDO pins are non-functional and must be left unconnected or tied to fixed logic levels to prevent noise coupling. This simplifies timing-critical designs where external watchdog supervision is preferred or unnecessary.

Can PFI be used to monitor a 2.5V supply rail?

Yes. By connecting a resistor divider (e.g., 100kΩ top, 51.1kΩ bottom) from the 2.5V rail to PFI, the input scales to 1.25V at the comparator threshold. The PFI input draws ≤2µA, minimizing divider loading error. This enables precise low-voltage detection without adding external references or comparators.

What is the minimum V_CC required for RESET/RESET assertion?

PT7A7533WE guarantees valid RESET and RESET outputs down to V_CC = 1.2V. Below this, output states are undefined. This ensures reliable last-cycle reset assertion during deep brownout - critical for preserving volatile register states or completing EEPROM writes before power loss.

Is PT7A7533WE pin-compatible with other members of the PT7A75xx family?

Yes - all PT7A75xxW variants share identical 8-pin SOIC (W) pinout and electrical interface. However, functional differences exist: PT7A7533WE lacks watchdog capability and provides dual-reset outputs, whereas PT7A7513WE offers active-low only with watchdog, and PT7A7523WE offers active-high only with watchdog. Board-level reuse is possible, but firmware and external connections must align with selected variant features.