Analog Devices Inc./Maxim Integrated DS1233Z-5+

Overview

DS1233Z-5+ from Analog Devices is a 5V microprocessor supervisory circuit in SOT-223 package that monitors V_CC for out-of-tolerance conditions, asserts a reset signal for 350ms after power recovery or pushbutton release, and features internal 5kΩ pull-up, precision temperature-compensated voltage reference, and pushbutton debouncing. It serves as a system-level power-fail detector and manual reset controller in embedded microcontroller applications.

For engineers reviewing the DS1233Z-5+ datasheet, DS1233Z-5+ pinout, DS1233Z-5+ application, or DS1233Z-5+ equivalent, key selection criteria include V_CC trip point accuracy (4.50–4.75V), guaranteed 350ms reset pulse width, SOT-223 thermal performance, pushbutton debounce timing, and compatibility with 5V microprocessor reset inputs requiring active-low assertion.

Technical Context

The DS1233Z-5+ implements dual-function supervision: a precision comparator with temperature-compensated reference detects V_CC falling below 4.50–4.75V (5% tolerance), while an integrated debouncer monitors the RST pin for external pushbutton transitions. Its internal 350ms delay timer ensures stable reset hold time regardless of V_CC slew rate or switch bounce.

It operates exclusively at 5V nominal supply, supports -40°C to +85°C ambient, and uses a single-polarity active-low open-drain RST output with internal 5kΩ pull-up - eliminating need for external pull-up in standard configurations. No enable, watchdog, or voltage-monitoring outputs beyond V_CC and RST are present.

Key Specifications

Pinout & Package

SOT-223 package: 4-pin surface-mount, thermally enhanced, with exposed thermal pad (pin 4 = GND). Pin 1 = GND, Pin 2 = RST (open-drain output), Pin 3 = V_CC, Pin 4 = GND (thermal & electrical ground).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G15DBVR, the DS1233Z-5+ uniquely integrates 5V-specific 5% trip accuracy, pushbutton debouncing, and internal pull-up in SOT-223 - reducing design effort for cost-sensitive 5V microcontroller systems where manual reset is mandatory.

Availability

DS1233Z-5+ is available at Aetrix Electronics and suitable for industrial PLC controllers, point-of-sale terminals, medical infusion pumps, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for DS1233Z-5+ 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The DS1233Z-5+ belongs to the EconoReset family of supervisory ICs designed specifically for cost-effective, reliable power-on and manual reset generation in 5V microcontroller-based systems with minimal external components.

FAQ

What is the exact V_CC trip point range for DS1233Z-5+?

The DS1233Z-5+ has a guaranteed V_CC trip point range of 4.50V to 4.75V at 25°C, corresponding to ±5% tolerance around 4.625V nominal. This range is maintained across the full -40°C to +85°C operating temperature with temperature compensation, ensuring consistent brown-out detection in varying environmental conditions. The DS1233Z-5+ datasheet specifies VCCTP0 as the defining parameter for this variant.

Does DS1233Z-5+ require an external capacitor for pushbutton operation?

Yes, DS1233Z-5+ requires a capacitor between 100pF and 0.01μF connected from the RST pin to ground for proper pushbutton debounce operation. This capacitor filters mechanical switch bounce and enables the internal timing circuit to detect valid button release events. For applications needing higher reset sink current, a minimum 500pF capacitor plus a parallel 1kΩ external pull-up resistor is recommended. The DS1233Z-5+ datasheet explicitly states this requirement in the "Operation-Pushbutton Reset" section.

Can DS1233Z-5+ monitor voltages other than 5V?

No, DS1233Z-5+ is factory-trimmed exclusively for 5V systems with a 5% tolerance window (4.50–4.75V). It does not support adjustable or user-configurable trip points. Other variants like DS1233Z-10+ (4.25–4.49V) or DS1233A-5+ (for 3.3V) exist, but DS1233Z-5+ itself is fixed to 5V monitoring. Its internal reference and comparator are optimized for this specific range, and operation outside it may result in unreliable reset assertion.

What is the function of Pin 4 on DS1233Z-5+?

Pin 4 on DS1233Z-5+ is a dedicated ground terminal used for both thermal dissipation and low-impedance signal return in the SOT-223 package. Unlike the TO-92 version (DS1233-5+), which has only three pins, the SOT-223 variant adds Pin 4 to enhance thermal performance and reduce ground path inductance. It must be connected to system ground and is not optional - omitting this connection degrades noise immunity and may cause erratic reset behavior under load transients.

Is DS1233Z-5+ RoHS-compliant and lead-free?

Yes, DS1233Z-5+ is RoHS-compliant and lead-free, as indicated by the "+" suffix in its part number per Analog Devices' packaging nomenclature. The "+" denotes a lead(Pb)-free/RoHS-compliant package, and the device meets EU RoHS Directive 2011/65/EU requirements. This applies to both tape-and-reel (DS1233Z-5+T&R) and standard SOT-223 configurations. Full compliance documentation is available in Analog Devices' official product change notices and material declarations.