Texas Instruments TPS3808EG125DBVRQ1

Overview

TPS3808EG125DBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade microprocessor supervisory circuit with fixed 1.25V undervoltage threshold (1.16V typical trip point), 0.6μA typical quiescent current, and user-programmable reset delay from 1.25ms to 150s via external capacitor on CT pin. It monitors power rails in ADAS domain controllers and digital cockpit units using separate SENSE and VDD pins.

For engineers reviewing the TPS3808EG125DBVRQ1 datasheet, TPS3808EG125DBVRQ1 pinout, TPS3808EG125DBVRQ1 application, or TPS3808EG125DBVRQ1 equivalent, key selection criteria include its ±0.5% threshold accuracy over –40°C to +125°C, open-drain RESET output requiring external pull-up, manual reset (MR) input with 90kΩ internal pull-up, and SOT-23-6 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The TPS3808EG125DBVRQ1 uses a precision internal reference to achieve ±0.5% voltage threshold accuracy for fixed-V_IT variants and incorporates hysteresis (1–2.5%) to prevent oscillatory reset assertion during slow-rising/falling supply transients. Its reset timing is controlled by an on-chip 220nA current source charging an external capacitor connected to the CT pin.

It operates across 1.7V–6V VDD, supports independent monitoring of system rails via dedicated SENSE input (0–6V range), and asserts an open-drain RESET output only when either SENSE falls below V_IT or MR is driven low - with deassertion delayed until both conditions clear and the programmed timeout expires.

Key Specifications

Pinout & Package

TPS3808EG125DBVRQ1 is housed in a 6-pin SOT-23 package (2.90mm × 1.60mm body size), optimized for high-density automotive PCBs and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808EG125DBVRQ1, the TPS3808G125DBVRQ1 sacrifices automotive qualification for lower cost, while the MAX6375XR25+T offers simpler fixed-function supervision at higher quiescent current and incompatible voltage threshold - making TPS3808EG125DBVRQ1 the sole option meeting AEC-Q100 Grade 1, 1.25V accuracy, and programmable delay in SOT-23-6.

Availability

TPS3808EG125DBVRQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, automotive gateways, and digital cockpit processing units requiring stable component supply with full automotive qualification and long-term production support.

Supply support for TPS3808EG125DBVRQ1 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 automotive ICs and rigorous AEC-Q100 qualification processes.

The TPS3808E-Q1 product line was designed specifically for automotive power-rail supervision, emphasizing ultra-low quiescent current, high threshold accuracy, and configurable reset timing to meet ASIL-B–aligned system monitoring requirements.

FAQ

What is the exact voltage threshold and accuracy of the TPS3808EG125DBVRQ1?

The TPS3808EG125DBVRQ1 has a nominal monitored rail of 1.25V with a typical trip point (V_IT) of 1.16V and ±0.5% threshold accuracy over –40°C to +125°C. This specification is confirmed in the device's Electrical Characteristics table and applies specifically to the TPS3808EG125DBVRQ1 variant, not the broader family. The accuracy ensures robust detection of 1.25V rail faults without excessive design margin.

Does the TPS3808EG125DBVRQ1 require external components for basic operation?

Yes - the TPS3808EG125DBVRQ1 requires a 0.1μF ceramic capacitor on the VDD pin for stable internal reference operation, an external pull-up resistor (10kΩ–1MΩ) on the open-drain RESET pin, and optionally a capacitor on the CT pin to program the reset delay. No external components are needed for MR functionality due to its internal 90kΩ pull-up, but unused MR should be left floating or tied to VDD.

Can the TPS3808EG125DBVRQ1 monitor a 1.25V rail while powered from a different supply voltage?

Yes - the TPS3808EG125DBVRQ1 features separate SENSE and VDD pins, allowing it to monitor a 1.25V rail (connected to SENSE) while being powered from a higher supply such as 3.3V or 5V (applied to VDD). This separation enables accurate, isolated supervision of core voltage domains without dependency on the supervisor's own supply rail.

What is the minimum and maximum reset delay time achievable with the TPS3808EG125DBVRQ1?

The TPS3808EG125DBVRQ1 supports a reset delay range of 1.25ms to 150s using an external capacitor on the CT pin. Fixed delays of 20ms (CT open) and 300ms (CT tied to VDD via 40–200kΩ) are also available. These values are specified in the Timing Requirements section and validated across the full –40°C to +125°C operating range for the TPS3808EG125DBVRQ1.

Is the TPS3808EG125DBVRQ1 pin-compatible with other members of the TPS3808E-Q1 family?

Yes - all TPS3808E-Q1 variants, including TPS3808EG125DBVRQ1, share identical SOT-23-6 (DBV) packaging and pinout. This allows direct substitution between fixed-threshold versions (e.g., TPS3808EG33DBVRQ1) and the TPS3808EG125DBVRQ1 on the same PCB footprint, provided the application's voltage threshold and timing requirements align.