Diodes Incorporated PI74ST1G32TEX

Overview

PI74ST1G32TEX from Pericom Semiconductor is a single 2-input OR gate logic IC operating from 1.8V to 3.6V V_CC, delivering 1.8ns typical propagation delay, ±24mA output drive at 3V, and high-impedance power-down capability. It serves as a compact, high-speed combinational logic element in signal routing, level translation, and enable-path control for portable and low-voltage embedded systems.

For engineers reviewing the PI74ST1G32TEX datasheet, PI74ST1G32TEX pinout, PI74ST1G32TEX application, or PI74ST1G32TEX equivalent, key selection criteria include its 1.8–3.6V supply range, SOT23/SC70 package compatibility, input/output voltage tolerance up to ±0.5V beyond rails, and guaranteed operation across –40°C to +85°C industrial temperature range.

Technical Context

The PI74ST1G32TEX implements standard positive-logic OR functionality with fully buffered inputs and outputs. Its TTL-compatible input thresholds (V_IH = 0.7×V_CC, V_IL = 0.3×V_CC) ensure robust noise immunity across the full 1.8–3.6V supply range, while its CMOS output stage supports rail-to-rail swing and high sink/source current.

Designed for low-power, high-speed digital interfacing, it features power-down high-impedance I/O states when V_CC = 0V, enabling hot-swap and bus-sharing applications. AC performance is characterized at 15pF load and 500Ω source impedance, with propagation delays tightly specified over temperature and voltage.

Key Specifications

Pinout & Package

PI74ST1G32TEX is housed in a Pb-free and RoHS-compliant 5-pin SC70 package (package code C), with 0.65mm pitch and JEDEC MO-203B/AA compliant dimensions. The SOT23-5 variant (package code T) shares identical pinout and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2-input OR gate applications.

Compared with SN74LVC1G32DBVR and NC7SZ32P5X, PI74ST1G32TEX offers the fastest propagation delay (1.8ns) at 1.8–3.6V and highest HBM ESD rating (4kV), making it optimal for timing-critical, low-voltage industrial interfaces where signal integrity and ruggedness are prioritized over 5V compatibility.

Availability

PI74ST1G32TEX is available at Aetrix Electronics and suitable for USB peripheral design, industrial sensor aggregation, portable display control, and low-power IoT wake logic requiring stable component supply and long-term manufacturability.

Supply support for PI74ST1G32TEX 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-performance interface, timing, and signal integrity solutions, acquired by Diodes Incorporated in 2016; legacy products maintain full datasheet compliance and long-term support.

The PI74ST1G32TEX belongs to Pericom's SOTiny™ Gate family-designed specifically for space-constrained, low-voltage digital logic applications demanding speed, low power, and robust I/O characteristics in ultra-small packages.

FAQ

Can PI74ST1G32TEX operate with 1.8V supply and 3.3V inputs?

No. Inputs are not 5V-tolerant or overvoltage-rated beyond V_CC + 0.5V per absolute maximum ratings. Applying 3.3V to an input while V_CC = 1.8V violates the DC input voltage limit (–0.5V to V_CC + 0.5V), risking latch-up or permanent damage. Use level translators for mixed-voltage interfacing.

What is the maximum capacitive load this OR gate can drive reliably?

The datasheet specifies AC performance at C_L = 15pF and R_L = 500Ω. While output drive supports ±24mA, maintaining <2ns propagation delay requires C_L ≤ 25pF. For loads >30pF, add series termination or buffer stages to prevent rise/fall time degradation and signal integrity loss.

Does PI74ST1G32TEX support partial power-down (e.g., V_CC active but unused inputs tied off)?

Unused inputs must be actively driven HIGH or LOW per datasheet recommendation; floating inputs cause increased ICC and potential oscillation. The power-down high-impedance state occurs only when V_CC = 0V. With V_CC applied, all I/O remain functional and must be properly terminated.

Is the SC70 package (C) pin-compatible with the SOT23-5 (T) variant?

Yes. Both PI74ST1G32TEX (SC70) and PI74ST1G32T (SOT23-5) share identical pin numbering (AIN-BIN-GND-YOUT-V_CC), electrical specifications, and thermal characteristics. Footprint adaptation is required due to smaller SC70 body size (2.0 × 1.25mm vs 2.9 × 1.6mm), but no schematic or logic changes are needed.