STMicroelectronics TSX3704IDT

Overview

TSX3704IDT from STMicroelectronics is a micropower CMOS quad voltage comparator with 5 µA typical supply current per channel, 1 pA typical input bias current, and push-pull output. It operates from 2.7 V to 16 V single supply (or ±1.35 V to ±8 V dual), features rail-to-rail input common-mode range including ground, and is qualified for automotive applications (-40 °C to +125 °C) in SO14 package.

For engineers reviewing the TSX3704IDT datasheet, TSX3704IDT pinout, TSX3704IDT application, or TSX3704IDT equivalent, this device supports precision threshold detection in battery-powered sensors, automotive body control modules, and industrial monitoring systems where ultra-low quiescent current and high input impedance are critical.

Technical Context

The TSX3704IDT integrates four independent comparators on a single die using ST's proprietary CMOS process optimized for micropower operation and ESD robustness (4 kV HBM). Each comparator features internally compensated push-pull output stages capable of sourcing/sinking 4 mA while maintaining low output voltage drops (e.g., 90–150 mV at 16 V supply).

Its input stage delivers 10¹² Ω typical input impedance and supports input voltages up to 16 V - exceeding VCC+ - enabling direct interface with overvoltage-tolerant sensors. The device maintains stable operation across full automotive temperature range without phase reversal, even with mismatched input voltage ranges.

Key Specifications

Pinout & Package

TSX3704IDT is supplied in SO14 (Small Outline 14-pin) package with standard JEDEC MS-012AC footprint. Pin 1 is located at the top-left corner adjacent to the index mark; pin numbering proceeds counter-clockwise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad voltage comparator applications.

Compared with TS3704CDT and TSX339IPT, TSX3704IDT uniquely combines automotive qualification, push-pull outputs, and sub-5 µA quiescent current - making it optimal for safety-critical, battery-constrained automotive subsystems where board space and thermal management are constrained.

Availability

TSX3704IDT is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC analog I/O modules, and portable medical device monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TSX3704IDT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets since 1987.

The TSX3704 belongs to ST's precision analog comparator product line, engineered specifically for ultra-low-power, high-reliability sensing in automotive and industrial environments where long-term stability and ESD resilience are mandatory.

FAQ

What is the maximum input voltage the TSX3704IDT can tolerate relative to VCC+?

The TSX3704IDT allows one input to be driven up to 16 V regardless of VCC+ value, enabling direct interface with overvoltage sensors or legacy 12 V signal sources. This capability is explicitly guaranteed in the datasheet's operating conditions table and requires no external clamping when used within absolute maximum ratings.

Can unused comparators be left floating, or must they be terminated?

Unused comparators must not be left floating: the datasheet mandates connecting both inputs to VCC+ or VCC− to prevent oscillation and excess current draw. Figure 18 shows recommended termination - tying IN+ to VCC+ and IN− to VCC− places the output in a stable low state and avoids unintended power consumption.

Does the TSX3704IDT require an external bypass capacitor, and if so, what value and placement?

Yes - a 0.1 µF ceramic capacitor must be placed as close as possible to the VCC+ and VCC− pins. This is explicitly required in Section 6.3 of the datasheet to suppress supply noise and prevent instability, especially during fast output transitions. Larger bulk capacitance may be added remotely, but the 0.1 µF local cap is non-optional.

How does the TSX3704IDT's push-pull output differ from open-drain alternatives like the TSX339?

The TSX3704IDT's push-pull output actively drives both logic-high and logic-low states without external components, reducing BOM count and improving rise/fall times. In contrast, TSX339 requires external pull-up resistors, introducing trade-offs in speed, power, and voltage translation flexibility - making TSX3704IDT preferable for deterministic timing and space-constrained designs.