Texas Instruments TPS3809J25DBVT

Overview

TPS3809J25DBVT from Texas Instruments is a 3-pin SOT-23 precision supply voltage supervisor IC designed for power-on reset and undervoltage monitoring in processor-based systems. It features a fixed 2.25 V threshold voltage, 9 μA typical supply current, 200 ms reset delay time, push-pull RESET output, and operates across –40°C to +85°C - used in server power sequencing and industrial microcontroller startup circuits.

For engineers reviewing the TPS3809J25DBVT datasheet, TPS3809J25DBVT pinout, TPS3809J25DBVT application, or TPS3809J25DBVT equivalent, key selection criteria include threshold accuracy (±2.2% over temperature), low quiescent current for battery-backed systems, SOT-23 footprint compatibility with legacy MAX809 designs, and absence of external components required for basic reset functionality.

Technical Context

The TPS3809J25DBVT integrates an internal 1.137 V reference, comparator, timer, and push-pull output stage to generate a precise, glitch-free active-low RESET signal. Its threshold is set by an internal resistor divider calibrated to 2.25 V ±2.2% over –40°C to +85°C, with 30 mV hysteresis to prevent chatter during slow-rising or noisy supply transitions.

During power-up, RESET asserts when VDD exceeds 1.1 V and remains active until VDD rises above 2.25 V, then holds low for 200 ms (typ) before deasserting. On supply droop, RESET reasserts immediately when VDD falls below 2.25 V - no external capacitor or resistor needed for timing or pull-up.

Key Specifications

Pinout & Package

SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, 1.45 mm max height, 3-pin surface-mount configuration with GND on Pin 1, RESET (push-pull, active-low) on Pin 2, and VDD on Pin 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3809J25DBVT, TLV809EDBVR offers superior threshold stability and lower output voltage drop, while MAX809SUR+T trades power efficiency and timing precision for broader legacy support - making TPS3809J25DBVT the balanced choice for cost-sensitive industrial applications needing proven reliability and minimal design change.

Availability

TPS3809J25DBVT is available at Aetrix Electronics and suitable for factory automation, wireless speakers, motor drives, and servers requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for TPS3809J25DBVT 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 leader specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability industrial and computing solutions.

The TPS3809 family was designed specifically for robust, low-component-count power-supply supervision in DSP and microprocessor systems - emphasizing precision thresholding, ultra-low quiescent current, and seamless integration into space-constrained PCB layouts.

FAQ

What is the exact threshold voltage of the TPS3809J25DBVT?

The TPS3809J25DBVT has a nominal threshold voltage of 2.25 V, specified as 2.20 V (min) to 2.30 V (max) over the full operating temperature range of –40°C to +85°C. This value is factory-trimmed and does not require external calibration. The TPS3809J25DBVT achieves this using an internal precision voltage divider referenced to a 1.137 V bandgap, delivering ±2.2% total accuracy including initial tolerance and temperature drift.

Does the TPS3809J25DBVT require an external pull-up resistor on the RESET pin?

No, the TPS3809J25DBVT features a push-pull RESET output stage capable of actively driving high or low, eliminating the need for an external pull-up resistor. This simplifies layout, reduces BOM count, and ensures fast, deterministic reset release. The output can sink up to 5 mA and source up to 5 mA, supporting direct connection to standard CMOS reset inputs without additional components.

What is the reset delay time of the TPS3809J25DBVT and how is it implemented?

The TPS3809J25DBVT provides a fixed 200 ms (typical) reset delay time after VDD rises above the 2.25 V threshold. This delay is generated by an internal oscillator-based timer and is not dependent on external capacitors or resistors. The delay begins once VDD exceeds V_IT and ensures the system remains held in reset long enough for processors, FPGAs, or memory to complete internal initialization before release.

Is the TPS3809J25DBVT pin-compatible with the MAX809 series?

Yes, the TPS3809J25DBVT is explicitly designed as a pin-for-pin compatible replacement for the MAX809 series in SOT-23-3 packages. It shares identical pin assignments (GND–RESET–VDD), same 2.25 V threshold option, and comparable electrical behavior - enabling drop-in substitution in existing designs without PCB modification. However, unlike the open-drain MAX809, the TPS3809J25DBVT uses a push-pull output, removing the need for an external pull-up.

What is the maximum supply voltage the TPS3809J25DBVT can tolerate?

The TPS3809J25DBVT has an absolute maximum supply voltage (VDD) rating of 6.5 V. While its recommended operating range is 2 V to 6 V, it can withstand short-duration transients up to 6.5 V without damage. For continuous operation, TI specifies that 6.5 V should not be applied for more than 1000 hours to ensure long-term reliability. This margin supports use in 5 V systems with typical switching regulator overshoot.