Diodes Incorporated PI74STX1GU04TEX

Overview

PI74STX1GU04TEX from Pericom Semiconductor is an unbuffered single inverter logic gate operating across 1.65V–5.5V supply, delivering 2.6ns typical propagation delay into 50pF at 5V, ±8mA balanced output drive at 3V, and high-impedance power-down capability. It serves as a high-speed signal polarity inversion stage in level-shifting interfaces and clock conditioning paths within portable and industrial control systems.

For engineers reviewing the PI74STX1GU04TEX datasheet, PI74STX1GU04TEX pinout, PI74STX1GU04TEX application, or PI74STX1GU04TEX equivalent, key selection criteria include unbuffered gate behavior, rail-to-rail input compatibility, low-power shutdown mode, and SOT23-5 package thermal limits for dense PCB layouts.

Technical Context

This device implements a CMOS unbuffered inverter topology with no internal staging-direct input-to-output coupling enables minimal phase delay and predictable linear-region behavior critical for oscillator feedback loops. Its input structure supports TTL- and CMOS-compatible thresholds across VDD = 1.65V–5.5V, while output drive strength scales with supply voltage.

The IC features true power-down mode: when VDD = 0V, both input and output terminals enter high-impedance state, preventing back-driving on shared buses. Absolute maximum ratings specify –0.5V to +6V on all pins, enabling robust handling of transient overvoltage during hot-swap or mixed-voltage system operation.

Key Specifications

Pinout & Package

PI74STX1GU04TEX is packaged in Pb-free and RoHS-compliant 5-pin SOT23 (package code T), with 1.3mm × 2.1mm footprint and 1.0mm height. Thermal resistance θJA ≈ 220°C/W enables operation up to 85°C ambient at full load without heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unbuffered inverter applications.

Compared with 74LVC1G04GW and SN74AUP1G04DBVR, PI74STX1GU04TEX uniquely combines unbuffered response, 5.5V tolerance, power-down capability, and 2.6ns speed-making it optimal for mixed-voltage timing-critical and power-aware designs.

Availability

PI74STX1GU04TEX is available at Aetrix Electronics and suitable for USB interface design, industrial sensor signal conditioning, and portable power sequencing requiring stable component supply and long-term manufacturability.

Supply support for PI74STX1GU04TEX 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

Pericom Semiconductor was a fabless provider of high-speed interface, timing, and signal integrity solutions, acquired by Diodes Incorporated in 2016; its legacy logic portfolio remains widely deployed in industrial and communications infrastructure.

The PI74STX1GU04 belongs to the SOTiny™ Gate STX series, engineered for ultra-small-footprint, high-speed logic functions in space-constrained and thermally sensitive applications such as handheld medical devices and modular PLC I/O modules.

FAQ

Can PI74STX1GU04TEX operate reliably at 1.65V supply?

Yes. The device is fully specified down to 1.65V VDD, with guaranteed VIH = 0.85×VDD and VIL = 0.15×VDD, and functional tPD ≤ 6.9ns into 50pF. DC parameters including VOL ≤ 0.1V and VOH ≥ 1.55V are verified across –40°C to +85°C at this minimum voltage.

What is the maximum capacitive load for stable 50MHz oscillation?

When used in a Pierce oscillator, the device supports stable 32.768kHz crystal operation with CL ≤ 12.5pF. For higher frequencies, empirical validation shows reliable 50MHz ring oscillation with total node capacitance ≤ 8pF-including stray and probe loading-due to its unbuffered gain profile and low CIN.

Is Pin 1 (NC) required to be grounded or left floating?

Pin 1 is internally unconnected and may be left floating per manufacturer guidance. However, PCB layout best practice recommends tying NC pins to GND to reduce EMI susceptibility and improve mechanical stability during reflow. No electrical performance impact occurs either way.

Does the power-down mode protect against back-current from live buses?

Yes. When VDD = 0V, both AIN and YOUT enter high-impedance state with IOFF ≤ ±1μA, preventing reverse current flow from powered downstream circuitry. This protects upstream drivers and avoids unintended logic state corruption during partial power-down sequences.