Diodes Incorporated PT7A7534WEX

Overview

PT7A7534WEX from Diodes Incorporated is a dual-output μP supervisor IC with precision 2.93V 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–5.5V supply range and guarantees RESET/RESET validity down to V_CC = 1.2V - used in embedded microcontroller systems requiring robust brownout and manual reset control.

For engineers reviewing the PT7A7534WEX datasheet, PT7A7534WEX pinout, PT7A7534WEX application, or PT7A7534WEX equivalent, key selection criteria include dual-reset polarity support, absence of watchdog timer (distinguishing it from PT7A751x/752x variants), PFI/PFO voltage monitoring capability, and SOIC-8 packaging for space-constrained industrial control boards.

Technical Context

The PT7A7534WEX implements a precision bandgap-based reset threshold detector (±1.5% over temperature) with hysteresis, enabling reliable power-up sequencing and brownout detection. Its dual-reset architecture provides simultaneous active-high (RESET) and active-low (RESET) outputs, eliminating external inverters in mixed-logic systems.

It integrates a dedicated 1.25V reference for the PFI input, allowing independent low-battery or power-fail warning generation via open-drain PFO output. Unlike PT7A751x/752x variants, PT7A753x devices omit the watchdog timer - confirmed by block diagram, functional description, and Function Comparison Table - simplifying timing-critical designs where watchdog supervision is handled externally.

Key Specifications

Pinout & Package

PT7A7534WEX is housed in an 8-pin SOIC (W) package - 150mil width, surface-mount, RoHS-compliant, with standard JEDEC MS-012AC footprint and thermal pad omitted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT29D3+ and TPS3808G33DBVR, PT7A7534WEX uniquely delivers dual-reset polarity and integrated 1.25V PFI/PFO in SOIC-8 - enabling compact, feature-complete supervision without external components or logic translation.

Availability

PT7A7534WEX 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 PT7A7534WEX 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 company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and quality systems aligned to AEC-Q100/200 standards.

The PT7A75xx family targets high-reliability μP supervision in industrial and automotive systems - designed to reduce component count, improve power-rail monitoring accuracy, and simplify reset sequencing across diverse voltage domains.

FAQ

Is PT7A7534WEX pin-compatible with PT7A7514WEX or PT7A7524WEX?

No - while all three share the same SOIC-8 package and pinout numbering, PT7A7514WEX and PT7A7524WEX include functional WDI/WDO pins for watchdog operation, whereas PT7A7534WEX leaves WDI and WDO unconnected (NC). Interchanging them will disable watchdog functionality or cause undefined behavior if WDI/WDO are actively driven.

Can PFI be used to monitor a 12V battery with PT7A7534WEX?

Yes - connect the battery through a precision resistor divider that scales 12V down to ≤1.25V at PFI. For example, a 10MΩ top resistor and 1.07MΩ bottom resistor yields 1.25V at 12V input. Ensure divider leakage (<2µA) does not affect accuracy, and use 1% tolerance resistors to maintain PFI threshold tolerance.

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

PFO is rated for 20mA DC output current per Absolute Maximum Ratings table. In typical operation with 3.3V V_CC, it sinks up to 1.2mA while maintaining VOL ≤0.3V - sufficient to drive LEDs, optocouplers, or MCU interrupt inputs directly without buffering.

Does PT7A7534WEX require external capacitors for reset timing?

No - the 200ms reset pulse width is internally generated and factory-trimmed; no external RC network is needed. This eliminates timing drift due to capacitor aging or temperature variation, ensuring consistent reset duration across product lifetime and environmental conditions.