Texas Instruments TPS3808EG19DBVR

Overview

TPS3808EG19DBVR from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.9V power rails in embedded systems. It features 1.77V undervoltage threshold (±0.5% typical accuracy), 0.6μA typical supply current, 20ms/300ms fixed or 1.25ms–10s capacitor-programmable reset delay, and operates across –40°C to +125°C. It is used in rack server motherboards and surgical equipment for reliable power-on reset assertion.

For engineers reviewing the TPS3808EG19DBVR datasheet, TPS3808EG19DBVR pinout, TPS3808EG19DBVR application, or TPS3808EG19DBVR equivalent, key selection considerations include its 1.77V factory-set threshold, SOT-23-6 package compatibility with space-constrained PCB layouts, open-drain RESET output requiring external pull-up, and CT-pin-based delay configuration options for system-level timing control.

Technical Context

The TPS3808EG19DBVR implements a precision voltage comparator with 0.5% threshold accuracy referenced to an internal bandgap, enabling stable undervoltage detection on 1.9V rails. Its reset logic combines SENSE input monitoring and manual reset (MR) assertion, with hysteresis (1–2.5%) preventing chatter during threshold crossings.

Reset timing is controlled via the CT pin: open-circuit yields 20ms delay, connection to VDD via resistor gives 300ms, and grounding through ≥130pF capacitor enables user-defined delays from 1.25ms to 10s. The device uses a 220nA internal current source to charge the external CT capacitor, ensuring predictable timeout behavior across temperature.

Key Specifications

Pinout & Package

TPS3808EG19DBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808EG19DBVR, TPS3808G19DBVR offers identical electrical performance without automotive screening, while MAX6326LT19D3+T trades MR capability and delay configurability for ultra-compact packaging - making each alternative optimal only when those specific trade-offs align with system constraints.

Availability

TPS3808EG19DBVR is available at Aetrix Electronics and suitable for rack server motherboard design, electricity meter certification, and DC-input BLDC motor drive development requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3808EG19DBVR 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 industrial, automotive, and personal electronics markets.

The TPS3808E product line was engineered specifically for ultra-low-power, high-accuracy power-rail supervision in thermally demanding environments - targeting applications where battery life, timing precision, and extended temperature operation are non-negotiable.

FAQ

What is the exact factory-trimmed threshold voltage of the TPS3808EG19DBVR?

The TPS3808EG19DBVR has a factory-trimmed undervoltage threshold of 1.77V, corresponding to a nominal 1.9V supply rail. This value is specified with ±0.5% typical accuracy over –40°C to +125°C, as confirmed in the device's Electrical Characteristics table. The TPS3808EG19DBVR achieves this precision using an internal bandgap reference and laser trimming during production, eliminating need for external resistor dividers in 1.9V monitoring applications.

How does the CT pin configure reset delay on the TPS3808EG19DBVR?

The CT pin on the TPS3808EG19DBVR determines reset delay through three distinct configurations: leaving it open yields 20ms, connecting it to VDD via a 40kΩ–200kΩ resistor gives 300ms, and tying it to GND via a ≥130pF capacitor enables user-programmable delays from 1.25ms to 10s. The TPS3808EG19DBVR uses an internal 220nA current source to charge the external capacitor, with timing governed by Equation 1 in the datasheet. Stray capacitance on CT must be minimized to maintain accuracy.

Does the TPS3808EG19DBVR support manual reset functionality?

Yes, the TPS3808EG19DBVR includes a dedicated MR (manual reset) input pin that asserts the open-drain RESET output when driven to ≤0.3×VDD. The MR pin features an internal 90kΩ pull-up resistor to VDD, allowing it to be left unconnected if unused. When MR is asserted low, RESET remains active regardless of SENSE voltage, and de-asserts only after both MR returns high and SENSE exceeds 1.77V, followed by the configured delay period - a behavior verified in the device's truth table and functional description.

What package type and dimensions does the TPS3808EG19DBVR use?

The TPS3808EG19DBVR is packaged in a 6-pin SOT-23 (DBV) case with nominal body dimensions of 2.90mm × 1.60mm and a maximum height of 1.30mm. This RoHS-compliant, lead-free package uses NiPdAu (NIPDAU) terminal finish and carries an MSL Level-1 rating for unlimited floor life at ≤30°C/60% RH. The pinout follows standard SOT-23 orientation with RESET at Pin 1, GND at Pin 2, MR at Pin 3, CT at Pin 4, SENSE at Pin 5, and VDD at Pin 6 - matching TI's DBV mechanical drawings.

Can the TPS3808EG19DBVR monitor supply voltages outside the 1.9V rail?

No - the TPS3808EG19DBVR is factory-configured exclusively for 1.77V threshold detection, optimized for 1.9V nominal rails. It cannot be adjusted to monitor other voltages; for different thresholds, TI offers variants like TPS3808EG33 (3.07V) or TPS3808EG01 (adjustable down to 0.405V). Attempting to use the TPS3808EG19DBVR for non-1.9V rails would result in incorrect reset assertion points, as its internal reference and comparator are trimmed specifically for 1.77V, with no external adjustment capability.