Texas Instruments TPS3809L30DBVR

Overview

TPS3809L30DBVR from Texas Instruments is a 3-pin SOT-23 supply voltage supervisor IC designed for precise power-on reset and brownout detection in processor-based systems. It features a fixed 2.64 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 serves as a system initialization monitor in DSPs, microcontrollers, and embedded controllers requiring reliable, low-power reset assertion.

For engineers reviewing the TPS3809L30DBVR datasheet, TPS3809L30DBVR pinout, TPS3809L30DBVR application, or TPS3809L30DBVR equivalent, this page delivers verified technical context, pin-level design meaning, real-world use scenarios, and validated alternative options - all grounded in TI's production-grade SLVS228D specification and orderable part documentation.

Technical Context

The TPS3809L30DBVR implements a precision bandgap-based voltage comparator with internal hysteresis (35 mV) and a monostable timer circuit. Its push-pull RESET output asserts low when V_DD falls below 2.64 V and remains active until V_DD rises above that threshold plus hysteresis, followed by a guaranteed 120–280 ms deassertion delay.

It requires no external components beyond a recommended 0.1-μF ceramic bypass capacitor on V_DD, supports supply voltages from 2 V to 6 V, and guarantees operation down to 1.1 V for initial reset assertion - enabling robust supervision even during deep undervoltage transients.

Key Specifications

Pinout & Package

SOT-23 (DBV) package: 3-pin, 2.90 mm × 1.60 mm body, 1.45 mm max height, tape-and-reel (3000 pcs/reel), RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E30DBVR and MAX809SEUR+T, the TPS3809L30DBVR offers the best balance of proven industrial reliability, documented 35 mV hysteresis, and seamless integration into TI-based processor platforms - making it ideal for volume production where long-term supply stability and datasheet consistency are critical.

Availability

TPS3809L30DBVR is available at Aetrix Electronics and suitable for factory automation, wireless audio systems, and motor control applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for TPS3809L30DBVR 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 expertise in high-reliability supervisory circuits.

The TPS3809 family was engineered specifically for cost-effective, low-power supply monitoring in DSP and microcontroller systems - delivering precision reset functionality in minimal footprint without external components.

FAQ

What is the exact reset threshold voltage of the TPS3809L30DBVR?

The TPS3809L30DBVR has a factory-trimmed negative-going input threshold voltage (V_IT–) of 2.64 V, with a guaranteed range of 2.58 V to 2.70 V across –40°C to +85°C. This value is fixed and does not require external adjustment - it is optimized for reliable supervision of 3.0 V nominal supply rails. The TPS3809L30DBVR datasheet (SLVS228D) specifies this parameter in Section 7.4 Electrical Characteristics.

Does the TPS3809L30DBVR require an external pull-up resistor on the RESET pin?

No, the TPS3809L30DBVR features a push-pull RESET output stage capable of actively driving high or low, eliminating the need for an external pull-up resistor. This reduces BOM count and PCB area while ensuring fast, deterministic reset signaling. The TPS3809L30DBVR can sink up to 5 mA and source up to 5 mA, supporting direct connection to standard CMOS and TTL inputs without additional components.

What is the purpose of the 0.1-μF capacitor recommended on the VDD pin of the TPS3809L30DBVR?

The 0.1-μF ceramic capacitor on the V_DD pin of the TPS3809L30DBVR stabilizes the internal voltage reference and suppresses high-frequency noise that could cause false reset triggering. Placed adjacent to the pin, it ensures accurate threshold detection during supply transients and improves immunity to ripple from switching regulators. This requirement is explicitly stated in the TPS3809L30DBVR datasheet Section 6 and Figure 6-1.

Is the TPS3809L30DBVR pin-compatible with the MAX809 series?

Yes, the TPS3809L30DBVR is pin-for-pin compatible with the MAX809 family in SOT-23-3 packages, sharing identical pin assignments (GND, RESET, V_DD). However, note that while functional equivalence is confirmed per TI's documentation, the TPS3809L30DBVR offers tighter threshold tolerance (±2.3% vs ±3.8% for MAX809), higher hysteresis (35 mV vs ~20 mV), and lower quiescent current (9 μA vs 12 μA). These differences should be verified in the target application.

What is the minimum supply voltage at which the TPS3809L30DBVR asserts RESET?

The TPS3809L30DBVR begins asserting RESET when V_DD rises above 1.1 V - this is the power-up reset voltage specified in Section 7.4 of the TPS3809L30DBVR datasheet. Below 1.1 V, RESET behavior is undefined; above it, the device monitors V_DD against its 2.64 V threshold and asserts low if V_DD drops below that level. This early activation ensures reset is active well before most processors reach operational voltage.