Texas Instruments TPS3809K33DBVRG4

Overview

TPS3809K33DBVRG4 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 (V_IT–), 200 ms reset delay (t_d), 9 μA typical supply current, and operates across –40°C to +85°C. It is used in servers and factory automation to ensure reliable DSP and microcontroller initialization.

For engineers reviewing the TPS3809K33DBVRG4 datasheet, TPS3809K33DBVRG4 pinout, TPS3809K33DBVRG4 application, or TPS3809K33DBVRG4 equivalent, key selection criteria include its push-pull active-low RESET output, no external components required, fixed threshold accuracy, and compatibility with 3.3 V supply rails in space-constrained embedded designs.

Technical Context

The TPS3809K33DBVRG4 integrates an internal 1.137 V reference, comparator, timer, and push-pull output stage to generate a precise, temperature-stable reset signal. Its threshold is set by an internal resistor divider, delivering ±3% accuracy over temperature and supply variation.

During power-up, RESET asserts when V_DD exceeds 1.1 V and remains active until V_DD rises above 2.93 V, after which a 120–280 ms delay ensures system stabilization before deassertion. A 40 mV hysteresis (V_hys) prevents oscillation during slow-rising or noisy supply conditions.

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 V_DD on Pin 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBVR and MAX809TRD29+T, the TPS3809K33DBVRG4 delivers lower quiescent current, guaranteed internal timing, and push-pull drive - simplifying layout, improving noise immunity, and reducing total solution size in new 3.3 V industrial designs.

Availability

TPS3809K33DBVRG4 is available at Aetrix Electronics and suitable for factory automation, server power management, and electricity metering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TPS3809K33DBVRG4 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 engineered specifically for robust, low-component-count power-supply supervision in DSP and microcontroller systems - emphasizing precision threshold stability, minimal board area, and wide-temperature reliability.

FAQ

What is the exact reset threshold voltage of the TPS3809K33DBVRG4?

The TPS3809K33DBVRG4 has a nominal 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 factory-trimmed and fixed by an internal resistor divider - no external adjustment is possible. The 2.93 V threshold is optimized for monitoring 3.3 V supply rails with appropriate margin against ripple and tolerance.

Does the TPS3809K33DBVRG4 require an external pull-up resistor on the RESET pin?

No, the TPS3809K33DBVRG4 features a push-pull RESET output stage, eliminating the need for an external pull-up resistor. The output actively drives high (to V_DD) and low (to GND) with specified VOL ≤ 0.3 V at 500 μA sink current. This simplifies PCB layout, improves noise immunity, and ensures faster rise/fall times compared to open-drain alternatives like the MAX809.

What is the reset delay time of the TPS3809K33DBVRG4 and how is it implemented?

The TPS3809K33DBVRG4 provides a fixed internal reset delay time (t_d) of 200 ms (typical), with a guaranteed range of 120–280 ms. This delay begins after V_DD rises above the 2.93 V threshold and ensures the system power rail remains stable before releasing the processor from reset. The timing is generated by an on-chip oscillator and timer - no external capacitors or resistors are required.

Can the TPS3809K33DBVRG4 operate with supply voltages below 3.3 V?

Yes, the TPS3809K33DBVRG4 operates over a supply range of 2 V to 6 V. While its 2.93 V threshold is optimized for 3.3 V systems, it remains functional down to 2 V - for example, supervising a 2.5 V rail with appropriate margin. However, below 2.5 V, the reset assertion margin shrinks; the device asserts RESET when V_DD falls below 2.93 V, so proper system-level voltage scaling must be verified.

Is the TPS3809K33DBVRG4 pin-compatible with other members of the TPS3809 family?

Yes, all TPS3809 variants - including TPS3809J25DBVRG4 (2.25 V), TPS3809L30DBVRG4 (2.64 V), TPS3809K33DBVRG4 (2.93 V), and TPS3809I50DBVRG4 (4.55 V) - share identical SOT-23 (DBV) 3-pin packaging and pinout (GND, RESET, V_DD). This allows direct substitution within the same footprint when changing supply voltage requirements, provided the threshold voltage matches the target rail.