Texas Instruments TPS3700QDSERQ1

Overview

TPS3700QDSERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive window voltage detector IC with dual open-drain outputs, internal 400-mV reference, 1.8 V to 18 V supply range, ±1% threshold accuracy over temperature, and 5.5 µA typical quiescent current - used for overvoltage/undervoltage monitoring in ADAS domain controllers and HEV/EV on-board chargers.

For engineers reviewing the TPS3700QDSERQ1 datasheet, TPS3700QDSERQ1 pinout, TPS3700QDSERQ1 application, or TPS3700QDSERQ1 equivalent, key selection considerations include its dual-comparator architecture with independent INA+ (undervoltage) and INB– (overvoltage) inputs, 18-V output rating enabling direct interface to higher-voltage logic rails, and built-in 5.5-mV hysteresis for noise immunity in automotive power rail monitoring.

Technical Context

The TPS3700QDSERQ1 integrates two precision comparators sharing a trimmed 400-mV internal reference: one noninverting (INA+) for undervoltage detection and one inverting (INB–) for overvoltage detection. Each comparator features programmable thresholds via external resistor dividers and asserts its respective open-drain output (OUTA/OUTB) when crossing its hysteresis-bounded threshold.

Its functional safety-capable design supports ISO 26262 ASIL-B system integration, with documented failure modes, FIT rate data, and safety analysis reports available from TI. The device operates across –40°C to +125°C junction temperature and tolerates input transients up to 6.5 V regardless of VDD level.

Key Specifications

Pinout & Package

TPS3700QDSERQ1 is packaged in a 6-pin Thin SOT-23 (DDC) with body size 2.90 mm × 1.60 mm, optimized for space-constrained automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar window voltage detection applications.

Compared with TPS3701QDSERQ1, the TPS3700QDSERQ1 provides identical voltage monitoring performance at lower complexity and cost, while TLV809EYZR lacks window functionality and cannot replace it in over/undervoltage coordination scenarios.

Availability

TPS3700QDSERQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, digital cockpit systems, and HEV/EV on-board chargers requiring stable component supply with automotive-grade traceability and long-term lifecycle support.

Supply support for TPS3700QDSERQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.

The TPS3700-Q1 product line delivers high-accuracy, AEC-Q100-qualified window voltage detectors designed specifically for safety-critical automotive power rail supervision in ADAS, electrification, and infotainment systems.

FAQ

What is the maximum input voltage allowed on the INA+ and INB– pins of the TPS3700QDSERQ1?

The TPS3700QDSERQ1 specifies a maximum input voltage of 6.5 V on both INA+ and INB– pins, independent of the VDD supply voltage. This allows safe monitoring of higher-voltage rails (e.g., 12 V or 24 V) using external resistor dividers while maintaining robustness against transients per AEC-Q100 stress testing. Exceeding 6.5 V risks damage to internal ESD protection structures.

Can the TPS3700QDSERQ1 be used to monitor a voltage rail higher than its own VDD supply?

Yes, the TPS3700QDSERQ1 can monitor rails higher than VDD - such as a 24-V battery rail while powered from a 5-V LDO - by using an external resistor divider network on INA+ or INB–. The device's 0–6.5 V input range and high-impedance inputs (±25 nA max bias current) ensure accurate scaling without loading the monitored rail, as confirmed in Section 8.1.3 of the datasheet.

Does the TPS3700QDSERQ1 support functional safety certification for ASIL-B systems?

Yes, the TPS3700QDSERQ1 is functional safety-capable with documentation available to aid ISO 26262 ASIL-B system design, including FMEDA reports, safety manuals, and diagnostic coverage analysis. It is AEC-Q100 Grade 1 qualified (–40°C to +125°C), HBM ±2500 V and CDM ±1000 V rated, and supports safety mechanisms like built-in hysteresis and predictable fault signaling via dedicated OUTA/OUTB outputs.

What is the purpose of the internal hysteresis in the TPS3700QDSERQ1, and how does it affect threshold behavior?

The TPS3700QDSERQ1 includes 5.5-mV typical internal hysteresis to prevent output oscillation during slow-moving or noisy input transitions near the threshold. For INA+, OUTA remains low until the input rises above VIT+ (400 mV), then stays high until it falls below (VIT+ – Vhys) ≈ 394.5 mV. Similarly, INB– requires the input to drop below (VIT+ – Vhys) to de-assert OUTB, ensuring glitch immunity in automotive electrical environments.

How does the TPS3700QDSERQ1 differ from standard single-supply reset ICs like the TLV809 series?

The TPS3700QDSERQ1 differs fundamentally as a dual-comparator window detector with adjustable thresholds, 18-V output rating, and automotive qualification - whereas TLV809 devices are single-threshold, fixed-voltage supervisors with 1.8–6-V supply limits and no overvoltage capability. TPS3700QDSERQ1 supports coordinated over/undervoltage response, wider input ranges, and AEC-Q100 compliance essential for ADAS and powertrain applications.