Texas Instruments TPS3808G01DBVRG4

Overview

TPS3808G01DBVRG4 from Texas Instruments is a low-quiescent-current, adjustable-threshold supervisory circuit that monitors system supply voltages down to 0.405 V and asserts an open-drain RESET signal upon undervoltage or manual reset assertion. It delivers 0.5% threshold accuracy (≤3.3 V), 2.4 μA typical supply current, and user-programmable 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 TPS3808G01DBVRG4 datasheet, TPS3808G01DBVRG4 pinout, TPS3808G01DBVRG4 application, or TPS3808G01DBVRG4 equivalent, key selection criteria include adjustable VIT ≥0.405 V, SOT-23-6 package compatibility, 20 ms / 300 ms fixed-delay options, –40°C to 125°C operation, and open-drain RESET with 0.4 V VOL at 1 mA.

Technical Context

The TPS3808G01DBVRG4 implements a precision voltage comparator with internal 0.405 V reference and 1.5–3% hysteresis to prevent chatter during threshold crossings. Its reset delay is generated by an internal 220 nA current source charging an external capacitor on the CT pin, enabling accurate timing from milliseconds to seconds without external oscillators.

It operates across 1.7–6.5 V supply range and supports dual reset triggers: SENSE voltage drop below VIT or logic-low assertion on MR pin, which features a 90 kΩ internal pull-up. The open-drain RESET output requires an external pull-up resistor (10 kΩ–1 MΩ) and tolerates voltages up to 6.5 V - independent of VDD.

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 TPS3808G01DBVRG4, TPS3808G01DBVR offers identical performance in volume packaging, while MAX6326UT29D3+ trades programmability for lower quiescent current and smaller footprint - making it viable only for simple, fixed-threshold applications where MR and delay tuning are unnecessary.

Availability

TPS3808G01DBVRG4 is available at Aetrix Electronics and suitable for battery-powered wearables, automotive body electronics, industrial PLCs, FPGA power sequencing, and medical sensor nodes requiring stable component supply across extended temperature and long-life deployments.

Supply support for TPS3808G01DBVRG4 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 microcontrollers.

The TPS3808 family is designed for precision voltage monitoring in resource-constrained systems, targeting applications demanding ultra-low I_DD, wide V_DD range, and field-programmable reset timing - especially in portable, automotive, and industrial environments.

FAQ

What is the exact threshold voltage of TPS3808G01DBVRG4 and how is it set?

The TPS3808G01DBVRG4 has a factory-set internal reference of 0.405 V, enabling adjustable monitoring thresholds down to this value using an external resistor divider on the SENSE pin. Unlike fixed-threshold variants (e.g., TPS3808G33), it does not monitor a specific rail directly - instead, it compares the divided-down input against 0.405 V. This allows precise supervision of any rail ≥0.405 V, including 0.5 V, 0.8 V, or 1.0 V supplies, when paired with appropriate R1/R2 values per the formula V_IT = 0.405 × (1 + R1/R2).

Can TPS3808G01DBVRG4 be used with a 1.2 V supply rail?

Yes, TPS3808G01DBVRG4 can supervise a 1.2 V rail by connecting it directly to the SENSE pin - no resistor divider is needed since 1.2 V exceeds the 0.405 V internal reference. The device will assert RESET when the 1.2 V rail drops below its calculated threshold (e.g., 1.2 V × 0.95 = 1.14 V with 5% hysteresis). Operation is guaranteed across 1.7–6.5 V V_DD, so powering the TPS3808G01DBVRG4 from the same 1.2 V rail is not supported; a higher auxiliary supply (e.g., 3.3 V) must be used for V_DD.

What are the valid configurations for the CT pin on TPS3808G01DBVRG4?

The CT pin on TPS3808G01DBVRG4 supports three validated configurations: (1) left open for 20 ms typical delay, (2) connected to V_DD via a 40–200 kΩ resistor for 300 ms typical delay, or (3) connected to GND through a ≥100 pF capacitor for user-adjustable delay from 1.25 ms to 10 s. Ceramic capacitors are recommended due to low leakage; stray capacitance must be minimized, and the CT node must be routed away from noisy signals to avoid timing inaccuracy.

Does TPS3808G01DBVRG4 support manual reset triggering, and how is it implemented?

Yes, TPS3808G01DBVRG4 includes a dedicated MR (manual reset) input (Pin 3) that asserts RESET when driven to logic low (≤0.3 × V_DD). The pin features a 90 kΩ internal pull-up to V_DD, so it may be left unconnected if unused. When active, MR overrides SENSE monitoring - RESET remains asserted until both MR returns high and SENSE exceeds V_IT + hysteresis, followed by the full programmed delay period. This enables pushbutton resets, watchdog timeouts, or system-level fault recovery.

What is the maximum allowable voltage on the RESET pin of TPS3808G01DBVRG4?

TPS3808G01DBVRG4 RESET pin supports voltages up to 6.5 V regardless of V_DD level, due to its open-drain architecture and internal clamp structure. This allows direct interfacing with higher-voltage logic families (e.g., 5 V MCUs) using an external pull-up resistor - no level shifter required. However, the pull-up resistor must be ≥10 kΩ to limit current into the RESET driver, and total sink current should not exceed 5 mA per absolute maximum ratings.