Texas Instruments TPS3808G15DBVR

Overview

TPS3808G15DBVR from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 1.5 V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 1.40 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 battery-powered microcontroller systems requiring precise power-on reset timing.

For engineers reviewing the TPS3808G15DBVR datasheet, TPS3808G15DBVR pinout, TPS3808G15DBVR application, or TPS3808G15DBVR equivalent, key selection considerations include its fixed 1.40 V threshold for 1.5 V rails, SOT-23-6 package compatibility, open-drain RESET output with 0.4 V max VOL at 1 mA, and operation across –40°C to 125°C.

Technical Context

The TPS3808G15DBVR implements a precision voltage comparator with built-in hysteresis (1% of VIT) and an on-chip 220 nA current source that charges an external CT capacitor to set reset delay. Its SENSE input monitors rail voltage directly, while MR provides logic-level manual reset initiation with internal 90 kΩ pull-up.

RESET assertion is triggered by either SENSE falling below 1.40 V or MR pulled low; de-assertion occurs only after both conditions clear and the programmed delay expires. The device operates from 1.7 V to 6.5 V supply and maintains 0.5% threshold accuracy over –40°C to 85°C for VIT ≤ 3.3 V.

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 NIPDAU/SN finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G15DBVR, TPS3808G15DBVT offers identical performance in smaller packaging for prototyping, while MAX6326XR14T sacrifices MR functionality, delay flexibility, and temperature range to reduce unit cost-making it suitable only for cost-constrained, non-safety-critical consumer applications.

Availability

TPS3808G15DBVR is available at Aetrix Electronics and suitable for microcontroller power-on reset, battery-powered IoT sensor nodes, and FPGA configuration monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TPS3808G15DBVR 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 TPS3808 family was engineered specifically for ultra-low-power, high-accuracy voltage supervision in resource-constrained embedded systems-emphasizing precision threshold matching, minimal IDD, and flexible reset timing across extended temperature ranges.

FAQ

What is the exact threshold voltage of the TPS3808G15DBVR?

The TPS3808G15DBVR has a nominal threshold voltage (VIT) of 1.40 V, corresponding to a 1.5 V nominal supply rail. This value is factory-trimmed with ±0.5% accuracy over –40°C to 85°C, as confirmed in TI's SBVS050M datasheet Section 5 (Device Voltage Thresholds). The TPS3808G15DBVR does not support adjustable thresholds - it is a fixed-threshold variant optimized for 1.5 V systems.

How is the reset delay time configured on the TPS3808G15DBVR?

The TPS3808G15DBVR reset delay is configured via the CT pin: leaving CT open yields a fixed 20 ms delay; connecting CT to VDD through a 40–200 kΩ resistor gives ~300 ms; connecting CT to GND through a ≥100 pF capacitor enables user-programmable delays from 1.25 ms to 10 s. The delay is generated by an internal 220 nA current source charging the external capacitor, as detailed in Section 8.3.2 of the datasheet.

Does the TPS3808G15DBVR require an external pull-up resistor on the RESET pin?

Yes, the TPS3808G15DBVR features an open-drain RESET output and requires an external pull-up resistor (10 kΩ to 1 MΩ) to establish a valid high logic level. This design allows the RESET signal to interface with processors operating at voltages higher than VDD (up to 6.5 V), as specified in Table 6-1 and Section 8.3.4 of the official datasheet.

Can the TPS3808G15DBVR monitor voltages other than 1.5 V?

No - the TPS3808G15DBVR is a fixed-threshold device calibrated exclusively for 1.5 V rails (VIT = 1.40 V). To monitor other voltages, TI offers alternate part numbers: e.g., TPS3808G33 for 3.3 V (3.07 V threshold) or TPS3808G01 for adjustable thresholds down to 0.405 V. Using TPS3808G15DBVR outside its specified 1.40 V threshold violates its design intent and invalidates accuracy guarantees.

What is the maximum operating temperature specification for the TPS3808G15DBVR?

The TPS3808G15DBVR is fully specified from –40°C to +125°C junction temperature (TJ), as stated in Section 1 (Features) and Section 7.3 (Recommended Operating Conditions) of the SBVS050M datasheet. Thermal metrics such as RθJA = 180.9°C/W (SOT-23) confirm its suitability for high-temperature industrial and automotive under-hood applications.