Texas Instruments TPS3808G50DBVT

Overview

TPS3808G50DBVT from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 5-V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 4.65 V. It delivers 0.5% threshold accuracy, 2.4 μA typical supply current, and user-adjustable reset delay from 1.25 ms to 10 s via external capacitor on CT pin. It is used in FPGA power sequencing, microcontroller startup validation, and battery-backed industrial controllers.

For engineers reviewing the TPS3808G50DBVT datasheet, TPS3808G50DBVT pinout, TPS3808G50DBVT application, or TPS3808G50DBVT equivalent, key selection criteria include its fixed 4.65-V threshold for 5-V rails, SOT-23-6 package compatibility with space-constrained PCBs, open-drain RESET output supporting mixed-voltage systems up to 6.5 V, and guaranteed operation from –40°C to 125°C.

Technical Context

The TPS3808G50DBVT implements a precision voltage comparator with built-in hysteresis (1%–2.5% of V_IT) and an on-chip 220-nA current source that charges an external CT capacitor to set reset delay. Its SENSE input monitors the 5-V rail directly without external divider, and MR provides asynchronous reset initiation with 90-kΩ internal pull-up.

RESET assertion is governed by dual-input logic: low SENSE (<4.65 V) or low MR independently triggers reset; deassertion requires both inputs to exceed thresholds *and* completion of the programmed delay. The device operates across 1.7–6.5 V supply range and maintains 2.4 μA quiescent current regardless of CT configuration.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant matte tin lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US46D3+ and TLV809E50DBZR, the TPS3808G50DBVT uniquely combines factory-trimmed 4.65-V accuracy, MR input, full CT-based delay programmability, and industry-standard SOT-23-6 footprint-making it the only option supporting flexible timing, manual intervention, and drop-in replacement in existing 6-pin supervisory layouts.

Availability

TPS3808G50DBVT is available at Aetrix Electronics and suitable for FPGA configuration monitoring, automotive infotainment boot validation, and battery-powered edge sensor node applications requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.

Supply support for TPS3808G50DBVT 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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability ICs for industrial, automotive, and communications markets.

The TPS3808 family was engineered specifically for low-power, high-accuracy power-supply monitoring in resource-constrained embedded systems-emphasizing quiescent current optimization, factory-trimmed thresholds, and flexible reset timing without external components.

FAQ

What is the exact threshold voltage of the TPS3808G50DBVT and how is it calibrated?

The TPS3808G50DBVT has a nominal threshold voltage of 4.65 V, factory-trimmed to ±1% accuracy for devices with V_IT > 3.3 V. This value is laser-trimmed during wafer test to match the 5-V nominal rail without requiring external resistors. The calibration is verified across –40°C to 125°C and is documented in Section 5 (Device Voltage Thresholds) of the TPS3808G50DBVT datasheet SBVS050M.

Can the TPS3808G50DBVT be used to monitor voltages other than 5 V?

No-the TPS3808G50DBVT is a fixed-threshold variant optimized exclusively for 5-V rails. Its internal reference is trimmed to 4.65 V and cannot be adjusted. For adjustable monitoring down to 0.4 V, use the TPS3808G01DBVT instead. Attempting to apply the TPS3808G50DBVT to lower rails will result in premature or failed reset assertion.

How do I configure the TPS3808G50DBVT for a 5-second reset delay?

To achieve a 5-second reset delay with the TPS3808G50DBVT, connect a 4.5-nF ceramic capacitor between the CT pin (Pin 4) and GND. Equation 1 in the datasheet gives CT (nF) = (t_D + 0.5) × 10³; for t_D = 5 s, CT ≈ 4500 pF. Use C0G/NP0 dielectric with ≤10% tolerance and minimize PCB stray capacitance near CT.

Does the TPS3808G50DBVT require an external pull-up resistor on the RESET pin?

Yes-the TPS3808G50DBVT features an open-drain RESET output and requires an external pull-up resistor (10 kΩ to 1 MΩ) to the target logic voltage (e.g., 3.3 V or 5 V). This resistor sets the high-state voltage and rise time; values <10 kΩ may overload the internal FET, while >1 MΩ increases noise susceptibility and slows rise time.

Is the TPS3808G50DBVT compatible with automotive AEC-Q100 qualification?

No-the TPS3808G50DBVT is not AEC-Q100 qualified. It is specified for industrial temperature range (–40°C to 125°C) and meets JEDEC JESD22 reliability standards, but lacks the stress testing, failure analysis, and documentation required for automotive grade. For AEC-Q100-compliant 5-V supervisors, consider TI's TPS3808Qxx series or NXP's MC33064 variants.