Texas Instruments TPS3850H18DRCR

Overview

TPS3850H18DRCR from Texas Instruments is a precision voltage supervisor IC with integrated programmable window watchdog timer, designed for system-level power monitoring and fault detection in high-reliability applications. It delivers 0.8% threshold accuracy over –40°C to +125°C, supports 1.6 V–6.5 V supply range, features open-drain RESET and WDO outputs, and operates with only 10 µA typical supply current. It is used to monitor critical rails such as 1.8 V microcontroller core supplies in medical and industrial systems.

For engineers reviewing the TPS3850H18DRCR datasheet, TPS3850H18DRCR pinout, TPS3850H18DRCR application, or TPS3850H18DRCR equivalent, key selection criteria include its ±4% and ±7% factory-selectable fault windows, user-programmable reset delay (703 µs to 3.22 s), window watchdog timing with 1/8 to 1/2 ratios, 0.5% hysteresis, and operation in harsh thermal environments up to +125°C junction temperature.

Technical Context

The TPS3850H18DRCR implements a dual-threshold window comparator on the SENSE pin with independent overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) detection, both achieving 0.8% accuracy across temperature. Its internal state machine evaluates CRST and CWD pins every time SENSE re-enters the valid window, enabling dynamic reconfiguration of reset and watchdog timing.

Watchdog functionality uses a dedicated WDI input with strict timing boundaries: falling edges must occur between tWDL and tWDU to prevent assertion, and WDO only drives low when RESET is high-ensuring coordinated fault signaling. SET0/SET1 logic pins select watchdog window ratios (1/8, 3/4, 1/2) or disable the watchdog entirely, supporting development-mode flexibility without hardware changes.

Key Specifications

Pinout & Package

TPS3850H18DRCR is housed in a 3.00-mm × 3.00-mm, 10-pin VSON package (DRC) with exposed thermal pad connected internally to GND. The package supports high-density PCB layouts and efficient thermal dissipation (R_θJA = 52.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3850H18DRCR, TPS3851H18DRCR adds a dedicated WDEN pin and higher ESD tolerance while maintaining full compatibility, whereas MAX6373KA29+T lacks window supervision and watchdog programmability-making it unsuitable for applications requiring precise fault windowing or firmware liveness verification.

Availability

TPS3850H18DRCR is available at Aetrix Electronics and suitable for ultrasound scanner, storage area network, active antenna system mMIMO (AAS), and robot servo drive applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3850H18DRCR 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 ICs.

The TPS3850 family is designed for mission-critical power supervision in automotive, industrial, and medical systems where precise voltage monitoring and programmable watchdog timing are essential for functional safety and system uptime.

FAQ

What is the voltage threshold accuracy of the TPS3850H18DRCR over temperature?

The TPS3850H18DRCR achieves ±0.8% overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) threshold accuracy across the full operating junction temperature range of –40°C to +125°C. This specification is verified per TI's production test flow and applies to both thresholds simultaneously, enabling reliable reset assertion even under extreme thermal stress in applications like AAS base stations or infusion pumps.

How does the TPS3850H18DRCR implement window watchdog functionality?

The TPS3850H18DRCR implements window watchdog functionality using dedicated WDI input and WDO output, with timing boundaries tWDL (lower) and tWDU (upper) defined by CWD and SET0/SET1 configuration. A falling edge on WDI must occur strictly between these boundaries to prevent WDO assertion; violation triggers WDO low for the programmed tRST duration. WDO only activates when RESET is high, ensuring coordinated fault signaling.

Can the reset delay of the TPS3850H18DRCR be configured without external components?

Yes, the TPS3850H18DRCR supports factory-programmed reset delay options-such as 10 ms or 200 ms-with ±9.5% accuracy-by leaving CRST unconnected or connecting it to VDD via a 10-kΩ resistor. No external capacitor is required for these configurations, reducing BOM count and PCB area while maintaining high timing precision for applications like HVAC controllers.

What package type and thermal characteristics does the TPS3850H18DRCR use?

The TPS3850H18DRCR uses a 3.00-mm × 3.00-mm, 10-pin VSON package (DRC) with exposed thermal pad connected to GND. Its thermal resistance is R_θJA = 52.3°C/W, R_θJB = 26.1°C/W, and R_θJC(bot) = 9.7°C/W. The thermal pad must be soldered to a large-area ground plane to achieve rated performance in high-temperature environments like robot servo drives.

Does the TPS3850H18DRCR support disabling the watchdog timer during development?

Yes, the TPS3850H18DRCR supports watchdog disable via logic states on SET0 and SET1 pins-specifically when SET0 = 1 and SET1 = 0. This feature eliminates unintended timeouts during firmware debugging without requiring hardware modifications or external jumpers, streamlining validation in applications such as infusion pump controller development.