Texas Instruments TPS3808G125DBVT

Overview

TPS3808G125DBVT from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.25 V system rails and assert an open-drain RESET signal when the SENSE voltage falls below 1.16 V threshold. It delivers 0.5% typical threshold accuracy, 2.4 μA typical supply current, and user-adjustable reset delay from 1.25 ms to 10 s-enabling reliable power-on reset in battery-powered microcontroller systems.

For engineers reviewing the TPS3808G125DBVT datasheet, TPS3808G125DBVT pinout, TPS3808G125DBVT application, or TPS3808G125DBVT equivalent, key selection criteria include its fixed 1.25 V monitoring capability, SOT-23-6 package compatibility, −40°C to 125°C operating range, and support for manual reset (MR) input and external capacitor-based delay programming.

Technical Context

The TPS3808G125DBVT implements a precision voltage comparator with built-in hysteresis and an on-chip 220 nA current source for CT-pin-based timing control. Its SENSE input monitors a fixed 1.25 V rail (VIT = 1.16 V), and RESET assertion is triggered by either SENSE falling below VIT or MR being driven low.

Reset de-assertion requires both SENSE > VIT + VHYS and MR high, followed by a delay determined by CT pin configuration: open (20 ms), connected to VDD via resistor (300 ms), or tied to ground-referenced capacitor (1.25 ms–10 s). The device operates across 1.7 V–6.5 V supply and draws only 2.4 μA typical quiescent current.

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 TPS3808G125DBVT, TPS3808G12DBVT offers identical architecture but targets 1.2 V rails, while MAX6326UT125+T trades programmability and MR support for ultra-compact size and lower component count in fixed-timing applications.

Availability

TPS3808G125DBVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, battery-powered IoT sensor nodes, FPGA configuration integrity, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges.

Supply support for TPS3808G125DBVT 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 for industrial, automotive, and personal electronics markets.

The TPS3808 product line delivers ultra-low-power, high-accuracy supervisory circuits for battery-sensitive and thermally demanding applications where precise voltage monitoring and flexible reset timing are critical.

FAQ

What is the exact threshold voltage and accuracy of the TPS3808G125DBVT?

The TPS3808G125DBVT has a nominal threshold voltage (VIT) of 1.16 V, corresponding to a 1.25 V supply rail. Its threshold accuracy is ±0.5% over −40°C to 85°C junction temperature, verified per TI's SBVS050M datasheet Section 7.5. This precision ensures reliable detection of brownout conditions without false triggering in noise-prone environments. The TPS3808G125DBVT maintains this specification across its full operating supply range of 1.7 V to 6.5 V.

How is the reset delay time configured on the TPS3808G125DBVT?

The TPS3808G125DBVT supports three reset delay configurations via the CT pin: leaving CT open yields a typical 20 ms delay; connecting CT to VDD through a 40–200 kΩ resistor gives ~300 ms; and connecting CT to ground via a capacitor ≥100 pF enables user-programmable delays from 1.25 ms to 10 s. The TPS3808G125DBVT uses an internal 220 nA current source to charge the capacitor, and delay time is calculated as tD = CT(nF) × 10⁻³ + 0.5 ms. All modes retain the same 2.4 μA quiescent current.

Does the TPS3808G125DBVT support manual reset, and how is it implemented?

Yes, the TPS3808G125DBVT includes a dedicated MR (manual reset) input (Pin 3) that asserts RESET when driven logic-low (≤0.3 × VDD). The MR pin features an internal 90 kΩ pull-up to VDD, allowing it to be left unconnected if manual reset is unused. When MR is asserted, RESET remains low regardless of SENSE voltage, and de-asserts only after MR returns high, SENSE exceeds VIT + VHYS, and the programmed delay expires. This behavior is confirmed in Section 8.3.3 and Table 8-1 of the TPS3808G125DBVT datasheet.

What package and pinout does the TPS3808G125DBVT use, and is it RoHS-compliant?

The TPS3808G125DBVT uses the SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, matte tin lead finish, and RoHS-compliant construction. Its pinout is RESET (1), GND (2), MR (3), CT (4), SENSE (5), VDD (6), as shown in Figure 6-1 of the datasheet. The device carries MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH) and is qualified per JEDEC J-STD-020 moisture sensitivity standards.

Can the TPS3808G125DBVT monitor voltages other than 1.25 V?

No-the TPS3808G125DBVT is a fixed-threshold variant optimized exclusively for 1.25 V rails (VIT = 1.16 V). It cannot be reconfigured for other voltages. For adjustable monitoring, TI offers the TPS3808G01DBVT (0.405 V base threshold, programmable via external resistor divider) or other family members like TPS3808G33DBVT (3.3 V rail). The TPS3808G125DBVT's internal reference and comparator are factory-trimmed for 1.25 V operation only, as specified in Table 5 of the SBVS050M datasheet.