Texas Instruments TPS3852G33DRBT

Overview

TPS3852G33DRBT from Texas Instruments is a precision voltage supervisor IC with integrated window watchdog timer, designed for reliable power-on reset and fault detection in microcontroller-based systems. It delivers 0.8% undervoltage threshold accuracy over –40°C to +125°C, ±15% factory-programmed watchdog timing accuracy, and 10 µA typical supply current. It monitors a nominal 3.3-V rail and asserts open-drain RESET and WDO outputs during undervoltage or watchdog timeout events.

For engineers reviewing the TPS3852G33DRBT datasheet, TPS3852G33DRBT pinout, TPS3852G33DRBT application, or TPS3852G33DRBT equivalent, key selection considerations include its 3.3-V fixed threshold variant (G33), VSON-8 package compatibility, programmable vs. factory-set watchdog windows, and dual-output fault signaling for safety-critical embedded control.

Technical Context

The TPS3852G33DRBT implements a precision bandgap reference and comparator architecture to achieve 0.8% VITN accuracy across temperature, with 0.5% hysteresis for noise immunity. Its window watchdog uses a dual-boundary timing scheme-lower boundary (tWDL) and upper boundary (tWDU)-where WDI falling edges must occur strictly between them to avoid WDO assertion.

Reset behavior is tightly coupled to VDD sequencing: RESET remains undefined below VPOR (0.8 V), asserts low when VDD falls below VITN (3.168 V), and deasserts only after VDD rises above VITN + VHYST and tRST (200 ms typ) elapses. The CWD pin supports three configuration modes-floating, 10-kΩ pull-up, or capacitor-to-GND-to select factory-programmed or user-adjustable watchdog timeouts.

Key Specifications

Pinout & Package

TPS3852G33DRBT is housed in a 3.00-mm × 3.00-mm, 8-pin VSON (DRB) package with exposed thermal pad connected internally to GND. The package supports high-density PCB layouts and efficient thermal dissipation in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision and watchdog applications.

Compared with TPS3852G33DRBT, TPS3851G33DRBT sacrifices window watchdog intelligence for lower BOM cost, while MAX6373KA33+T omits watchdog entirely and trades 0.8% accuracy for SO-8 compatibility-neither matches the TPS3852G33DRBT's combination of precision, dual outputs, and safety-oriented timing architecture.

Availability

TPS3852G33DRBT is available at Aetrix Electronics and suitable for industrial control systems, telematics control units, and patient monitoring devices requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3852G33DRBT 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

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability IC design.

The TPS3852G33DRBT belongs to TI's precision voltage supervisor product line, engineered specifically for safety-critical and high-availability systems where deterministic reset behavior and fault-discriminating watchdog functionality are mandatory.

FAQ

What is the exact undervoltage threshold voltage for TPS3852G33DRBT?

The TPS3852G33DRBT has a nominal undervoltage threshold (VITN) of 3.168 V, corresponding to a 3.3-V rail with 4.8% drop. This value is factory-trimmed and guaranteed to remain within ±0.8% (±25.3 mV) over –40°C to +125°C, as confirmed in the Electrical Characteristics table of the SBVS302 datasheet.

Does TPS3852G33DRBT support user-programmable watchdog timeout values?

Yes, TPS3852G33DRBT supports user-programmable watchdog timeout via an external capacitor on the CWD pin. With a 100 pF–1 µF capacitor, tWDU can be set from 62.7 ms to 77.5 s using tWDU(typ) = 77.4 × CCWD(µF) + 0.055 s. Alternatively, leaving CWD floating or pulling it up with 10 kΩ selects factory-programmed values (e.g., 1360–1840 ms).

How does the SET1 pin affect watchdog operation in TPS3852G33DRBT?

In TPS3852G33DRBT, grounding SET1 (Pin 5) disables the watchdog timer entirely: WDI input is ignored, WDO enters high-impedance state, and no watchdog assertions occur. This is essential during firmware development, FPGA configuration, or bootloader execution to prevent unintended resets-while RESET supervision remains fully active.

What is the function of the WDO pin in TPS3852G33DRBT, and how does it differ from RESET?

The WDO pin in TPS3852G33DRBT is an independent open-drain watchdog fault indicator that asserts low only when WDI violates the tWDL/tWDU window *and* RESET is high. Unlike RESET-which forces full system restart-WDO enables non-intrusive fault logging, diagnostic signaling, or selective subsystem recovery without disrupting core operations.

Can TPS3852G33DRBT monitor voltage rails other than 3.3 V?

TPS3852G33DRBT is a fixed-threshold device optimized for 3.3-V rails (VITN = 3.168 V). It cannot monitor arbitrary voltages. For other rails (e.g., 1.8 V or 5 V), TI offers variants like TPS3852G18 or TPS3852G50. All share the same VSON-8 package, pinout, and feature set-only VITN differs by part number suffix.