Texas Instruments TPS3808G09DBVRG4

Overview

TPS3808G09DBVRG4 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 upon undervoltage or manual reset. It delivers 0.5% threshold accuracy, 2.4 μA typical supply current, and user-adjustable delay from 1.25 ms to 10 s via external capacitor on CT pin. It is used in battery-powered microcontroller systems requiring reliable power-on reset with minimal current draw.

For engineers reviewing the TPS3808G09DBVRG4 datasheet, TPS3808G09DBVRG4 pinout, TPS3808G09DBVRG4 application, or TPS3808G09DBVRG4 equivalent, key selection criteria include its fixed 0.84 V threshold for 0.9 V nominal rail monitoring, SOT-23-6 package compatibility, –40°C to 125°C operating range, and open-drain RESET output requiring external pull-up.

Technical Context

The TPS3808G09DBVRG4 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 system voltage directly, while MR provides asynchronous reset initiation with internal 90 kΩ pull-up.

RESET assertion occurs when SENSE falls below 0.84 V or MR is driven low; de-assertion requires both SENSE > 0.84 V + hysteresis and MR high, followed by the full programmed delay. The device operates across 1.7 V to 6.5 V supply range and maintains 0.5% threshold accuracy for VIT ≤ 3.3 V over temperature.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max 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 TPS3808G09DBVRG4, the TPS3808G09DBVR offers identical functionality but differs only in packaging logistics, while the MAX6326LT09D2T sacrifices programmability and MR capability for smaller size-making TPS3808G09DBVRG4 the optimal choice for designs requiring field-tunable reset timing and robust manual intervention.

Availability

TPS3808G09DBVRG4 is available at Aetrix Electronics and suitable for battery-powered sensor nodes, automotive body control modules, and FPGA configuration sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3808G09DBVRG4 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 consumer markets.

The TPS3808 family is engineered for precision voltage supervision in resource-constrained systems, emphasizing ultra-low quiescent current, factory-trimmed thresholds, and flexible reset timing to replace discrete RC-based reset circuits in modern embedded platforms.

FAQ

What is the exact threshold voltage of the TPS3808G09DBVRG4 and how is it calibrated?

The TPS3808G09DBVRG4 has a nominal threshold voltage (VIT) of 0.84 V, factory-trimmed to ±0.5% accuracy for VIT ≤ 3.3 V across –40°C to 125°C. This value corresponds to monitoring a 0.9 V nominal supply rail and is achieved using a precision internal voltage reference and laser trimming during wafer test. The TPS3808G09DBVRG4 datasheet Section 5 confirms this fixed threshold with no user adjustment required.

Can the TPS3808G09DBVRG4 be used to monitor voltages other than 0.9 V?

No-the TPS3808G09DBVRG4 is a fixed-threshold variant optimized exclusively for 0.9 V rail monitoring with 0.84 V trip point. To supervise other rails, select alternate members such as TPS3808G12 (1.2 V) or TPS3808G33 (3.3 V). For adjustable thresholds down to 0.4 V, use the TPS3808G01 with external resistor divider. The TPS3808G09DBVRG4 does not support external threshold programming.

What is the recommended pull-up resistor value for the open-drain RESET output of the TPS3808G09DBVRG4?

Texas Instruments specifies a pull-up resistor between 10 kΩ and 1 MΩ for the TPS3808G09DBVRG4 RESET pin. A 100 kΩ resistor is commonly used to balance rise time (<1 μs with 50 pF load) and current consumption (33 μA at 3.3 V). Values below 10 kΩ risk exceeding the 5 mA absolute maximum sink current rating; values above 1 MΩ may cause excessive rise time in noisy environments.

How does the CT pin function on the TPS3808G09DBVRG4, and what capacitor value yields a 100 ms delay?

The CT pin on the TPS3808G09DBVRG4 controls reset delay via an internal 220 nA current source charging an external capacitor to 1.23 V. Using Equation 1 from the datasheet (CT = (t_D + 0.5) × 10³ nF), a 100 ms delay requires CT ≈ 100.5 nF. A standard 100 nF X7R ceramic capacitor (≥100 pF, low leakage) achieves this; parasitic capacitance must be minimized per Section 11.1 layout guidance to maintain timing accuracy.

Is the TPS3808G09DBVRG4 compatible with the TPS3808G09DBVR, and what does the 'G4' suffix indicate?

Yes-the TPS3808G09DBVRG4 is functionally and electrically identical to the TPS3808G09DBVR. The 'G4' suffix denotes TI's standard tape-and-reel packaging option: 3,000 units per reel, moisture-sensitive level-1 handling, and NIPDAU/SN lead finish. No circuit or performance differences exist; the TPS3808G09DBVRG4 is selected for high-volume automated assembly where packaging format matters.