Texas Instruments TPS3850H12DRCT

Overview

TPS3850H12DRCT from Texas Instruments is a precision voltage supervisor IC with integrated programmable window watchdog timer, designed for high-reliability microcontroller and SoC power-rail monitoring. 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 in a 3-mm × 3-mm 10-pin VSON package. Used in ultrasound scanners and active antenna systems where tight voltage tolerance and fault-detection timing integrity are critical.

For engineers reviewing the TPS3850H12DRCT datasheet, TPS3850H12DRCT pinout, TPS3850H12DRCT application, or TPS3850H12DRCT equivalent, key selection considerations include its ±4% and ±7% factory-selectable fault windows, user-programmable reset delay (703 µs–3.22 s), window watchdog upper/lower boundary timing (e.g., 9.35 ms–1.84 s), 10 µA typical supply current, and 0.5% hysteresis on both OV/UV thresholds.

Technical Context

The TPS3850H12DRCT implements a dual-threshold window comparator on the SENSE pin with independent overvoltage (VIT+(OV)) and undervoltage (VIT−(UV)) detection, each achieving 0.8% accuracy across temperature. Its internal precision clock drives both the RESET delay timer and the window watchdog state machine, enabling accurate timing of tRST (170–230 ms factory default) and tWDL/tWDU boundaries (e.g., 7.65–1840 ms depending on SET0/SET1/CWD configuration).

Watchdog operation requires valid WDI edge transitions within dynamically configurable time windows-lower boundary (tWDL) and upper boundary (tWDU)-with ratio options of 1:8, 3:4, or 1:2 selected via SET0/SET1 logic inputs. The device supports watchdog disable via SET pin combinations and uses dedicated open-drain outputs (RESET, WDO) with 0.4 V VOL at 3 mA sink current.

Key Specifications

Pinout & Package

TPS3850H12DRCT is housed in a 3.00-mm × 3.00-mm, 10-pin VSON (DRC) package with exposed thermal pad connected internally to GND. Pin 1 is VDD; pin 5 is GND; pin 10 is SENSE. The thermal pad must be soldered to a large-area ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3851H12DRCT, the TPS3850H12DRCT reduces system BOM count by eliminating need for external load switch while maintaining identical timing accuracy and thermal performance; versus MAX6373KA29+T, it adds programmable window watchdog and rail-flexible SENSE input at the cost of higher pin count and design complexity.

Availability

TPS3850H12DRCT 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 TPS3850H12DRCT 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and silicon innovation for industrial, automotive, and communications markets.

The TPS3850 family was developed to address high-accuracy, multi-function power supervision needs in next-generation infrastructure equipment-specifically targeting systems where simultaneous voltage monitoring, precise reset timing, and intelligent watchdog behavior are required to meet functional safety and reliability targets.

FAQ

What is the operating voltage range supported by the TPS3850H12DRCT?

The TPS3850H12DRCT supports an input voltage range of 1.6 V to 6.5 V on the VDD pin, and the SENSE pin accepts monitored rail voltages from 0 V to 6.5 V. This allows direct supervision of common logic rails including 1.2 V, 1.8 V, 3.3 V, and 5 V without level-shifting. The device maintains 0.8% threshold accuracy across this full VDD range and over the –40°C to +125°C junction temperature span. TPS3850H12DRCT is specified to operate reliably even under noisy supply conditions when paired with a 0.1-µF bypass capacitor on VDD.

How does the TPS3850H12DRCT implement window watchdog functionality?

The TPS3850H12DRCT implements a true window watchdog using two independently configurable time boundaries: tWDL (lower) and tWDU (upper). A valid WDI falling edge must occur strictly between these boundaries to prevent WDO assertion. Ratios of 1:8, 3:4, or 1:2 are selected via SET0/SET1 logic states in combination with CWD pin configuration. For example, with CWD = NC, SET0 = 0, SET1 = 1, tWDL = 1.48–2.22 ms and tWDU = 23.4–31.6 ms. TPS3850H12DRCT also supports watchdog disable via specific SET pin combinations, enabling safe development-mode operation.

What are the factory-programmed reset delay options for the TPS3850H12DRCT?

The TPS3850H12DRCT offers factory-programmed reset delay (tRST) options of 170–230 ms (typical 200 ms) when CRST is left unconnected (NC), or 8.5–11.5 ms when CRST is pulled up to VDD via a 10-kΩ resistor. These factory defaults provide 9.5% timing accuracy and eliminate external capacitors in designs with fixed timing requirements. TPS3850H12DRCT also supports capacitor-programmed delays from 703 µs (0.1 nF) to 3.22 s (1000 nF) when CRST is connected to ground through a capacitor, enabling precise adaptation to system-specific power-up sequences.

Can the TPS3850H12DRCT monitor multiple voltage rails simultaneously?

No, the TPS3850H12DRCT monitors only one voltage rail per device via its single SENSE pin. However, it supports a wide input range (0.9 V to 5.0 V) and offers selectable ±4% or ±7% fault windows, making it suitable for supervising diverse rails-including 1.2-V core, 1.8-V I/O, and 3.3-V interface supplies-by selecting appropriate threshold variants (e.g., TPS3850H12DRCT is configured for 1.2-V nominal). To supervise multiple rails, multiple TPS3850H12DRCT units or a multi-channel supervisor like the TPS386000 would be required. Each TPS3850H12DRCT instance provides independent RESET and WDO signaling.

What package type and thermal characteristics does the TPS3850H12DRCT use?

The TPS3850H12DRCT is packaged in a 3.00-mm × 3.00-mm, 10-pin VSON (DRC) package with an exposed thermal pad internally connected to GND. Its junction-to-ambient thermal resistance (RθJA) is 52.3°C/W, and junction-to-board (RθJB) is 26.1°C/W-enabling reliable operation at full rated load in compact PCB layouts. The thermal pad must be soldered to a large-area ground plane for optimal thermal dissipation and EMI performance. TPS3850H12DRCT operates across –40°C to +125°C junction temperature, with absolute maximum ratings extending to +150°C.