Texas Instruments TPS3809J25QDBVRQ1

Overview

TPS3809J25QDBVRQ1 from Texas Instruments is an automotive-grade 3-pin supply voltage supervisor IC that monitors 2.5 V system rails, asserts active-low RESET when VDD drops below 2.25 V (±0.05 V), features 200 ms fixed reset delay, consumes only 9 μA typical supply current, and operates across −40°C to +125°C for use in engine control units and ADAS domain controllers.

For engineers reviewing the TPS3809J25QDBVRQ1 datasheet, TPS3809J25QDBVRQ1 pinout, TPS3809J25QDBVRQ1 application, or TPS3809J25QDBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, precise 2.25 V threshold with 30 mV hysteresis, SOT-23 (DBV) 3-pin package compatibility, and absence of external components in reset circuit design.

Technical Context

The TPS3809J25QDBVRQ1 implements a precision bandgap-based voltage comparator with internal 1.137 V reference and resistor divider to set 2.25 V trip point. Its reset logic includes a monostable timer that initiates only after VDD rises above VIT−, ensuring clean power-on sequencing without chatter.

It uses open-drain output architecture with 0.2 V low-level output at 500 μA load and VDD–0.2 V high-level output at −500 μA, enabling direct interface to microcontroller reset inputs. The device requires no external timing components and exhibits immunity to short negative transients on VDD due to internal filtering.

Key Specifications

Pinout & Package

TPS3809J25QDBVRQ1 is housed in a 3-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with GND on Pin 1, open-drain RESET output on Pin 2, and VDD (supply input and monitored rail) on Pin 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3809K33QDBVRQ1 and MAX809TRD3T1G, the TPS3809J25QDBVRQ1 uniquely delivers AEC-Q100 Grade 1 compliance with a 2.25 V threshold optimized for 2.5 V logic domains, making it the sole qualified option for safety-critical automotive 2.5 V rail supervision.

Availability

TPS3809J25QDBVRQ1 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS radar modules, camera ECUs, and USB-C power delivery hubs requiring stable component supply throughout extended production lifecycles.

Supply support for TPS3809J25QDBVRQ1 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, delivering analog and embedded processing solutions for automotive, industrial, and consumer markets since 1930.

The TPS3809-Q1 product line was developed specifically to provide AEC-Q100-qualified, low-quiescent-current voltage supervisors for automotive microcontroller and DSP power sequencing, with emphasis on reliability in harsh thermal and electrical environments.

FAQ

What is the exact reset threshold voltage of the TPS3809J25QDBVRQ1?

The TPS3809J25QDBVRQ1 has a guaranteed reset threshold voltage of 2.25 V (typical), with a min/max range of 2.20 V to 2.30 V over the full −40°C to +125°C operating temperature range. This value is factory-trimmed and specified in Section 7.5 of the official datasheet under "VIT− Negative-going input threshold voltage" for the J25 variant.

Does the TPS3809J25QDBVRQ1 require an external pull-up resistor on the RESET pin?

Yes, the TPS3809J25QDBVRQ1 features an open-drain RESET output and requires an external pull-up resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements; TI recommends 47 kΩ for general-purpose automotive applications.

Is the TPS3809J25QDBVRQ1 pin-compatible with the MAX809 series?

The TPS3809J25QDBVRQ1 is pin-for-pin compatible with the MAX809 family in the SOT-23-3 package (Pin 1 = GND, Pin 2 = RESET, Pin 3 = VDD), as explicitly stated in the "Features" section of the TI datasheet. However, functional equivalence requires verification of threshold voltage, delay time, and qualification grade for the target application.

What is the maximum supply voltage the TPS3809J25QDBVRQ1 can withstand?

The absolute maximum supply voltage for the TPS3809J25QDBVRQ1 is 7 V, as defined in Section 7.1 "Absolute Maximum Ratings". Operation above 6 V is not recommended for continuous use; TI specifies 2 V to 6 V as the recommended operating range to ensure long-term reliability and parametric performance.

How does the TPS3809J25QDBVRQ1 handle power-up sequencing?

During power-up, the TPS3809J25QDBVRQ1 asserts RESET low when VDD exceeds 1.1 V and holds it active until VDD rises above 2.25 V, then delays 200 ms before releasing RESET high. This ensures the monitored 2.5 V rail is fully stabilized and all downstream logic has completed internal initialization before system execution begins.