STMicroelectronics TSX339IDT

Overview

TSX339IDT from STMicroelectronics is a micropower CMOS quad voltage comparator in SO14 package, featuring 5 µA typical supply current per comparator, ±1.35 V to ±8 V dual or 2.7–16 V single supply operation, and 1 pA typical input bias current. It delivers open-drain outputs, rail-to-rail input common-mode range including ground, and 2 µs typical propagation delay with 5 mV overdrive - deployed in automotive battery monitoring and industrial sensor signal conditioning circuits.

For engineers reviewing the TSX339IDT datasheet, TSX339IDT pinout, TSX339IDT application, or TSX339IDT equivalent, key selection considerations include ultra-low quiescent current across wide supply range, guaranteed operation from −40 °C to +125 °C, open-drain output compatibility with mixed-voltage logic interfaces, and automotive-grade qualification in TSSOP14 variant (TSX339IYPT).

Technical Context

The TSX339IDT integrates four independent high-impedance comparators on a single die, each with input bias current ≤10 pA and input offset voltage ≤6 mV over full temperature range. Its ESD tolerance reaches 4 kV HBM and 200 V MM, and it supports input voltages up to 16 V - even exceeding V_CC - while maintaining phase-reversal immunity.

Designed as an enhanced replacement for TS339, it improves upon input offset voltage, ESD robustness, and current consumption. The SO14 package enables drop-in compatibility with legacy designs, while its open-drain outputs require external pull-up resistors for level translation and wired-OR logic implementation.

Key Specifications

Pinout & Package

TSX339IDT is supplied in SO14 (Small Outline 14-pin) package with standard 1.27 mm pitch, 8.7 mm × 4.0 mm body, and gull-wing leads. The exposed pad is not present in SO14; thermal resistance R_thJA is 105 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TS339IDT, TSX339IDT offers tighter offset voltage, superior ESD protection, and extended temperature range - making it the preferred choice for automotive and harsh-environment designs. TSX3704IDT trades power efficiency for output convenience in compact consumer or industrial control applications.

Availability

TSX339IDT is available at Aetrix Electronics and suitable for automotive battery management, industrial sensor signal conditioning, and HVAC blower control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TSX339IDT 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 analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

The TSX339 belongs to ST's precision analog comparators product line, engineered specifically for ultra-low-power, high-reliability threshold detection in automotive and industrial control systems operating across −40 °C to +125 °C.

FAQ

What is the maximum input voltage allowed on TSX339IDT inputs relative to V_CC+?

The TSX339IDT permits one input to exceed V_CC+ up to 16 V, provided the other remains within the common-mode range (0 V to V_CC+ − 1.5 V). This capability enables direct interface with unregulated battery rails during load-dump events without external clamping diodes - confirmed in Section 6.1 of DS11385 Rev 4.

Can unused comparators be left floating, or do they require termination?

Unused comparators must not be left floating: Figure 18 in DS11385 Rev 4 specifies connecting both inputs of inactive channels to V_CC+ or V_CC− to prevent oscillation and excess current draw. Floating inputs cause unpredictable output states and increase total supply current by up to 3× due to internal metastability.

Is the SO14 package of TSX339IDT lead-free and RoHS compliant?

Yes - TSX339IDT uses ST's ECOPACK2-compliant SO14 package, certified lead-free and RoHS-compliant per EU Directive 2011/65/EU. The device carries the "E2" marking per ST's packaging nomenclature and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements.

Does TSX339IDT support dual-supply operation with asymmetric rails (e.g., +5 V / −3 V)?

No - the TSX339IDT supports symmetric dual supplies only (±1.35 V to ±8 V), as specified in Table 2 of DS11385 Rev 4. Asymmetric rails violate the absolute maximum rating for differential supply voltage (V_CC+ − V_CC− ≤ 18 V) and may cause undefined behavior or damage due to internal bias network imbalance.