Texas Instruments TPS3809K33DBVTG4

Overview

TPS3809K33DBVTG4 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 2.93 V threshold voltage, 200 ms reset delay time, 9 μA typical supply current, and operates across –40°C to +85°C - enabling reliable system initialization in industrial motor drives and building automation controllers.

For engineers reviewing the TPS3809K33DBVTG4 datasheet, TPS3809K33DBVTG4 pinout, TPS3809K33DBVTG4 application, or TPS3809K33DBVTG4 equivalent, key selection criteria include its push-pull RESET output, no external component requirement, SOT-23 (DBV) package compatibility with MAX809 footprints, and guaranteed operation down to 2 V supply voltage.

Technical Context

The TPS3809K33DBVTG4 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, delivering ±1.5% accuracy over temperature and line regulation.

During power-up, RESET asserts when VDD exceeds 1.1 V and remains active until VDD rises above 2.93 V, followed by a 200 ms (typ) delay before deassertion. On brownout, RESET reasserts immediately when VDD falls below 2.93 V, with 40 mV hysteresis ensuring noise immunity.

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 (Pin 1), RESET (Pin 2), and VDD (Pin 3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3809K33DBVTG4, TLV809E33DBVR offers superior accuracy and lower power but shares identical timing and pinout, while MAX809TRD29+T trades push-pull simplicity for open-drain flexibility at higher quiescent current and reduced noise margin.

Availability

TPS3809K33DBVTG4 is available at Aetrix Electronics and suitable for factory automation, motor drives, and building automation requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for TPS3809K33DBVTG4 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 over 50 years of innovation in industrial and automotive electronics.

The TPS3809 family was engineered specifically for cost-sensitive, space-constrained power supervision in DSP and microcontroller systems - prioritizing low quiescent current, fixed-threshold reliability, and seamless integration into 3.3 V infrastructure.

FAQ

What is the exact reset threshold voltage of the TPS3809K33DBVTG4?

The TPS3809K33DBVTG4 has a factory-trimmed negative-going input threshold voltage (V_IT–) of 2.93 V, with a guaranteed range of 2.87 V to 2.99 V across –40°C to +85°C. This value is fixed internally and optimized for 3.3 V supply monitoring, eliminating the need for external resistor networks or calibration.

Does the TPS3809K33DBVTG4 require an external pull-up resistor on the RESET pin?

No, the TPS3809K33DBVTG4 uses a push-pull output stage on the RESET pin, meaning it actively drives both high and low states. Unlike open-drain supervisors, it does not require an external pull-up resistor - simplifying design and reducing BOM count while ensuring robust signal integrity into CMOS/TTL inputs.

What is the reset delay time specification for the TPS3809K33DBVTG4?

The TPS3809K33DBVTG4 provides a nominal reset delay time (t_d) of 200 ms, with a guaranteed range of 120 ms to 280 ms over temperature and voltage. This delay begins after VDD rises above the 2.93 V threshold and ensures sufficient time for microcontrollers, FPGAs, and memory devices to stabilize before releasing reset.

Can the TPS3809K33DBVTG4 operate from a 2.5 V supply rail?

Yes, the TPS3809K33DBVTG4 supports supply voltages from 2 V to 6 V, making it fully functional on 2.5 V rails. However, its 2.93 V threshold means it will assert RESET continuously below that level - so it is best applied to 3.3 V systems. For 2.5 V supervision, TPS3809J25 (2.25 V threshold) is the appropriate variant.

Is the TPS3809K33DBVTG4 pin-compatible with the MAX809 series?

Yes, the TPS3809K33DBVTG4 is explicitly designed as a pin-for-pin compatible replacement for the MAX809 family in SOT-23 packages. It matches the same 3-pin DBV footprint, pin assignments (GND, RESET, VDD), and functional behavior - though it improves on MAX809 with push-pull output and tighter hysteresis control.