Texas Instruments TPS3808EG25DBVR

Overview

TPS3808EG25DBVR from Texas Instruments is a low-quiescent-current, fixed-threshold supervisory circuit with 2.33 V undervoltage detection, 20 ms to 10 s programmable reset delay, open-drain RESET output, and -40°C to +125°C operation in SOT-23-6 package. It monitors 2.5 V rails in battery-powered industrial controllers and ensures safe microprocessor power-up sequencing.

For engineers reviewing the TPS3808EG25DBVR datasheet, TPS3808EG25DBVR pinout, TPS3808EG25DBVR application, or TPS3808EG25DBVR equivalent, key selection criteria include threshold accuracy (±0.5% typ), ultra-low 0.6 µA quiescent current, CT-pin programmable delay, separate SENSE/VDD pins, and MR input for system-initiated reset assertion.

Technical Context

The TPS3808EG25DBVR uses an internal precision voltage reference and comparator with 1% typical threshold accuracy to detect undervoltage on the SENSE pin relative to its factory-set 2.33 V trip point. Its reset assertion logic combines analog sensing and digital timing control via an on-chip 220 nA current source charging the external CT capacitor.

Reset deassertion requires both SENSE > VIT + VHYS (1–2.5% hysteresis) and MR high, followed by a user-defined delay determined by CT pin configuration: open (20 ms), resistor-to-VDD (300 ms), or capacitor-to-GND (1.25 ms–10 s). The open-drain RESET output supports pull-up voltages up to 6 V independent of VDD.

Key Specifications

Pinout & Package

TPS3808EG25DBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in embedded systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with TPS3808G25DBVR, the TPS3808EG25DBVR provides guaranteed operation to +125°C and tighter threshold accuracy-critical for automotive and industrial deployments. Against MAX6326LT23D2T, it trades fixed timing for 0.6 µA current and full delay configurability, enabling longer battery life and flexible system integration.

Availability

TPS3808EG25DBVR is available at Aetrix Electronics and suitable for rack server motherboard power sequencing, electricity meter supervision, and BLDC motor drive control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3808EG25DBVR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and microcontroller technologies.

The TPS3808E product line was designed specifically for ultra-low-power, high-accuracy voltage supervision in battery-critical and thermally demanding applications-including industrial automation, medical instrumentation, and automotive subsystems.

FAQ

What is the exact threshold voltage and accuracy specification for TPS3808EG25DBVR?

The TPS3808EG25DBVR has a nominal undervoltage threshold of 2.33 V with ±0.5% typical accuracy over –40°C to +125°C. This value is factory-trimmed and applies specifically to the TPS3808EG25DBVR variant-not the adjustable or other fixed-threshold versions of the TPS3808E family. The accuracy ensures robust 2.5 V rail monitoring without external calibration or trimming components.

How does the CT pin configure reset delay on TPS3808EG25DBVR?

The CT pin on TPS3808EG25DBVR determines reset delay through three configurations: leaving CT open yields 20 ms, connecting CT to VDD via a 40–200 kΩ resistor gives 300 ms, and connecting CT to GND via a ≥130 pF capacitor enables user-programmable delays from 1.25 ms to 10 s. The internal 220 nA current source charges the capacitor; delay time is calculated per Equation 1 in the datasheet. Stray capacitance must be minimized for accuracy.

Can TPS3808EG25DBVR monitor a different voltage rail than its supply voltage?

Yes, TPS3808EG25DBVR supports independent monitoring and supply rails: the SENSE pin monitors the target 2.5 V rail, while VDD can be powered from a separate 1.7–6 V source (e.g., 3.3 V digital supply). This separation prevents loading errors and enables accurate supervision of sensitive analog or isolated supplies without affecting the supervisor's own operation.

What is the maximum allowable voltage on the RESET pin of TPS3808EG25DBVR?

The RESET pin of TPS3808EG25DBVR is rated for up to 6 V, independent of VDD. As an open-drain output, it can be pulled up to any voltage within the absolute maximum rating (–0.3 V to 6 V), allowing interoperability with higher-voltage logic families or mixed-supply systems. A minimum 10 kΩ pull-up resistor is required to ensure proper VOL performance and avoid excessive sink current.

Does TPS3808EG25DBVR include hysteresis, and what is its typical value?

Yes, TPS3808EG25DBVR includes built-in comparator hysteresis of 1–2.5% relative to its 2.33 V threshold, resulting in approximately 23–58 mV of hysteresis voltage. This prevents oscillatory reset behavior during slow-moving or noisy supply ramps and ensures clean, glitch-free assertion and deassertion of the RESET signal during marginal voltage conditions.