Texas Instruments TPS3808G09DBVT

Overview

TPS3808G09DBVT from Texas Instruments is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor 0.9 V system rails and assert an open-drain RESET signal when the SENSE voltage drops below 0.84 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-enabling reliable power-on reset in battery-powered microcontroller systems.

For engineers reviewing the TPS3808G09DBVT datasheet, TPS3808G09DBVT pinout, TPS3808G09DBVT application, or TPS3808G09DBVT equivalent, key selection criteria include its fixed 0.84 V threshold for 0.9 V rails, SOT-23-6 package compatibility, −40°C to 125°C operation, open-drain RESET output with external pull-up, and manual reset (MR) input support for system-level reset coordination.

Technical Context

The TPS3808G09DBVT 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 asynchronous reset initiation via logic-low assertion.

RESET deassertion requires both SENSE > VIT + VHYS and MR = high, followed by a precise delay determined by CT configuration-open (20 ms), resistor-to-VDD (300 ms), or capacitor-to-GND (1.25 ms–10 s). The device operates across 1.7 V–6.5 V VDD and maintains 0.5% threshold accuracy for VIT ≤ 3.3 V over full temperature range.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G09DBVT, the DBVR variant offers identical supervision functionality in volume-optimized packaging, while the MAX6326LT09D2T sacrifices programmability and MR capability for size reduction-making it viable only in constrained, fixed-timing applications.

Availability

TPS3808G09DBVT is available at Aetrix Electronics and suitable for microcontroller power-on reset, battery-powered IoT sensor nodes, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3808G09DBVT 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, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.

The TPS3808 family was engineered specifically for low-power, high-accuracy voltage supervision in space-constrained and battery-sensitive applications-targeting portable electronics, automotive subsystems, and industrial edge controllers.

FAQ

What is the exact threshold voltage of the TPS3808G09DBVT and how is it calibrated?

The TPS3808G09DBVT has a factory-trimmed threshold voltage of 0.84 V, corresponding to a nominal 0.9 V supply rail. This value is achieved using a precision internal reference and laser trimming, delivering ±0.5% accuracy over −40°C to 125°C. The TPS3808G09DBVT datasheet specifies this as V_IT = 0.84 V with 0.5% typical tolerance, verified per TI's production test flow.

Can the TPS3808G09DBVT supervise voltages other than 0.9 V?

No-the TPS3808G09DBVT is a fixed-threshold variant optimized exclusively for 0.9 V rails (V_IT = 0.84 V). To monitor other rails, select alternate members of the family: e.g., TPS3808G33 for 3.3 V (V_IT = 3.07 V) or TPS3808G01 for adjustable thresholds down to 0.405 V. The TPS3808G09DBVT does not support external resistor dividers or threshold adjustment.

What is the minimum CT capacitor value required for programmable delay on the TPS3808G09DBVT?

The TPS3808G09DBVT requires a minimum CT capacitor of 100 pF to reliably recognize the presence of an external timing element. Capacitor values below this threshold may result in inconsistent or shortened delay times due to insufficient charge accumulation. For accurate 1.25 ms–10 s programming, use low-leakage ceramic capacitors and minimize PCB parasitics near the CT pin.

Does the TPS3808G09DBVT require an external pull-up resistor on the RESET pin?

Yes-the TPS3808G09DBVT features an open-drain RESET output and requires an external pull-up resistor between RESET and the target supply rail (e.g., 3.3 V or 5 V). TI recommends 10 kΩ to 1 MΩ; a 100 kΩ resistor is commonly used to balance rise time and power consumption. Without this resistor, the RESET signal cannot transition high and will remain undefined.

How does the MR (manual reset) pin function on the TPS3808G09DBVT?

The MR pin on the TPS3808G09DBVT is an active-low input with an internal 90 kΩ pull-up to VDD. Driving MR to ≤0.3×VDD asserts RESET immediately, independent of SENSE voltage. When MR returns high and SENSE exceeds 0.84 V + hysteresis, RESET remains low for the programmed delay before deasserting. If unused, MR may be left floating-the internal pull-up ensures default high state.