STMicroelectronics TS836-4IZ

Overview

TS836-4IZ from STMicroelectronics is a micropower voltage supervisor IC with active-high reset output, designed for power-on reset and power-fail detection in microcontroller systems. It features a precision 4.50 V threshold (±330 mV over temperature), ultra-low 12 µA supply current at 5 V, guaranteed operation down to 1 V supply, and 100 mV internal hysteresis.

For engineers reviewing the TS836-4IZ datasheet, TS836-4IZ pinout, TS836-4IZ application, or TS836-4IZ equivalent, key selection criteria include reset threshold accuracy across -40°C to +85°C, open-drain output drive capability (450 mV @ 8 mA), fast 20 µs response time under 10 mV overdrive, and TO-92 package compatibility with legacy board layouts.

Technical Context

The TS836-4IZ integrates a thermally matched band-gap reference and comparator with fixed 4.5 V trip point, enabling stable reset assertion during V_CC ramp-up and ramp-down. Its open-drain output supports pull-up to any rail up to 7 V and sinks up to 20 mA.

Internal 100 mV hysteresis prevents chatter near threshold, and the 20 µs propagation delay ensures reliable timing for MCU initialization sequences. The device operates continuously from 1 V to 5.5 V supply, maintaining valid reset state even during brown-out conditions.

Key Specifications

Pinout & Package

TS836-4IZ is supplied in TO-92 plastic package (order code Z), with 3-pin through-hole mounting and standard lead spacing. Pin 1 = OUT (open-drain), Pin 2 = IN (voltage sense input), Pin 3 = GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809SEUR+T and TPS3808G15DBVR, TS836-4IZ uniquely combines 4.5 V precision threshold, 1 V minimum operation, TO-92 compatibility, and 12 µA consumption-making it optimal for cost-sensitive, space-constrained industrial upgrades where legacy footprint retention is mandatory.

Availability

TS836-4IZ is available at Aetrix Electronics and suitable for microcontroller power-on reset, industrial power-fail detection, and energy-harvesting sensor node applications requiring stable component supply and long-term obsolescence mitigation.

Supply support for TS836-4IZ 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing capabilities.

The TS836 series belongs to ST's micropower analog supervisor product line, engineered specifically for reliable, low-cost reset generation in resource-constrained embedded systems operating across extended industrial temperature ranges.

FAQ

What is the reset output polarity and drive strength of TS836-4IZ?

The TS836-4IZ provides an active-high open-drain reset output. It sinks up to 20 mA with a typical low-level voltage of 450 mV at 8 mA load and 4 V supply. An external pull-up resistor is required to define the high-state voltage level, supporting interoperability with 3.3 V or 5 V logic families.

Does TS836-4IZ require an external capacitor for stable operation?

No external capacitor is required for basic reset functionality. The device incorporates 100 mV internal hysteresis to reject noise. However, an external capacitor can be added between IN and GND to increase reset delay time during supply ramp-up or ramp-down, per Figure 5 in the datasheet.

Can TS836-4IZ operate with a 3.3 V supply rail?

Yes - TS836-4IZ operates from 1 V to 5.5 V supply, making it fully compatible with 3.3 V systems. Its 4.5 V threshold remains valid across this range, ensuring reset assertion occurs only when the 3.3 V rail is out of specification (e.g., during brown-out), provided the monitored rail is the main 3.3 V supply.

Is TS836-4IZ still in active production or marked obsolete?

While the original STMicroelectronics datasheet carries "Obsolete Product(s)" banners, TS836-4IZ remains actively stocked and supported by Aetrix Electronics through authorized legacy distribution channels. Full traceability, RoHS-compliant batches, and extended lifecycle documentation are available upon request.