Texas Instruments TPS3700QDDCRQ1

Overview

TPS3700QDDCRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive window voltage detector 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 TPS3700QDDCRQ1 datasheet, TPS3700QDDCRQ1 pinout, TPS3700QDDCRQ1 application, or TPS3700QDDCRQ1 equivalent, key selection considerations include its dual-comparator window detection architecture, 18-V output rating independent of VDD, built-in 5.5-mV hysteresis, -40°C to 125°C junction operation, and ThinSOT-23-6 package compatibility with space-constrained automotive PCBs.

Technical Context

The TPS3700QDDCRQ1 integrates two high-accuracy comparators sharing a trimmed 400-mV internal reference: INA+ (noninverting) monitors undervoltage via resistor divider, while INB– (inverting) monitors overvoltage. Each comparator drives a dedicated open-drain output (OUTA/OUTB) rated to sink 40 mA at up to 18 V, with propagation delays under 30 µs and input voltage tolerance up to 6.5 V regardless of VDD.

Its functional safety-capable design includes documented failure modes, FIT rate data, and diagnostic coverage support per ISO 26262. The device asserts OUTA low when INA+ falls below (VIT+ – Vhys), and OUTB low when INB– exceeds VIT+, enabling precise window detection with 5.5 mV typical hysteresis to reject noise-induced false triggers.

Key Specifications

Pinout & Package

TPS3700QDDCRQ1 is packaged in a 6-pin ThinSOT-23 (DDC) with 2.90 mm × 1.60 mm body size, optimized for high-density automotive PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3700QDDCRQ1, the WSON-packaged TPS3700QDSERQ1 offers superior thermal resistance for high-ambient environments, while TLV809EYZR sacrifices window functionality and adjustability for ultra-low quiescent current - making TPS3700QDDCRQ1 the sole option meeting AEC-Q100 Grade 1, functional safety, and dual-rail monitoring requirements simultaneously.

Availability

TPS3700QDDCRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, digital cockpit power management, and HEV/EV on-board charger supervision requiring stable component supply with guaranteed long-term automotive lifecycle support.

Supply support for TPS3700QDDCRQ1 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 and embedded processing solutions, with over 50 years of automotive-grade product development and AEC-Q100 qualification expertise.

The TPS3700-Q1 product line delivers high-accuracy, high-voltage window supervisors specifically engineered for functional safety-critical automotive power monitoring - targeting ASIL-B/C system integration in ADAS, electrification, and digital cockpit domains.

FAQ

What is the maximum input voltage allowed at the INA+ and INB– pins of the TPS3700QDDCRQ1?

The TPS3700QDDCRQ1 specifies a maximum input voltage of 6.5 V at both INA+ and INB– terminals, independent of the VDD supply voltage. This allows safe monitoring of higher-voltage rails (e.g., 12-V or 24-V systems) using external resistor dividers while maintaining internal comparator integrity and avoiding damage. Exceeding 6.5 V violates absolute maximum ratings and may cause permanent device failure.

Can the TPS3700QDDCRQ1 be used to monitor a 24-V automotive rail?

Yes, the TPS3700QDDCRQ1 can monitor a 24-V rail by scaling the voltage with an external resistor divider to ensure the divided voltage at INA+ or INB– remains ≤6.5 V. For example, a 24-V input scaled by a 4:1 ratio yields 6 V at the comparator input - within specification. The internal 400-mV reference and ±1% accuracy preserve threshold precision across temperature, enabling reliable 24-V system supervision in commercial vehicle applications.

Does the TPS3700QDDCRQ1 support wired-AND logic between OUTA and OUTB?

Yes, the TPS3700QDDCRQ1 supports wired-AND logic by connecting OUTA and OUTB to a common pull-up resistor. Since both outputs are open-drain, the combined signal goes low if either comparator asserts - effectively creating a logical OR of fault conditions (UV OR OV). This eliminates need for external logic gates in fail-safe architectures where any supply violation must trigger system reset.

What is the purpose of the internal hysteresis in the TPS3700QDDCRQ1?

The TPS3700QDDCRQ1 incorporates 5.5-mV typical internal hysteresis to prevent output oscillation during slow-moving or noisy supply transitions near threshold voltages. This eliminates external hysteresis resistors and associated layout sensitivity, ensuring clean, glitch-free reset assertion in electrically harsh automotive environments - critical for meeting ISO 11452-4 EMC immunity requirements.

Is the TPS3700QDDCRQ1 qualified for use in safety-critical automotive systems?

Yes, the TPS3700QDDCRQ1 is AEC-Q100 Grade 1 qualified (–40°C to 125°C ambient), HBM ±2500 V ESD rated, and explicitly designated as functional safety-capable. Texas Instruments provides FMEDA reports, FIT data, and safety manual documentation to support ISO 26262 ASIL-B system-level certification - making TPS3700QDDCRQ1 suitable for safety mechanisms in ADAS and powertrain ECUs.