Diodes Incorporated PI74ST1G126CEX

Overview

PI74ST1G126CEX from Pericom Semiconductor is a single 3-state non-inverting buffer IC operating from 1.8V to 3.6V V_CC, featuring 1.8ns typical propagation delay, ±24mA output drive at 3V, and SC70-5 package. It serves as a level-shifting bus interface buffer in low-voltage portable logic systems.

For engineers reviewing the PI74ST1G126CEX datasheet, PI74ST1G126CEX pinout, PI74ST1G126CEX application, or PI74ST1G126CEX equivalent, key selection criteria include 3-state enable timing (t_PZL/t_PHZ ≤ 7.1ns), input voltage thresholds (V_IL = 0.25V_CC, V_IH = 0.75V_CC), and high-speed DC/AC performance across 1.8–3.6V supply range.

Technical Context

This device implements a single-channel CMOS buffer with active-low 3-state control (OE), enabling bidirectional bus isolation in mixed-voltage systems. Its design supports rail-to-rail input compatibility (0–5.5V) while maintaining valid logic levels under 1.8–3.6V V_CC.

The internal circuitry delivers fast switching (t_PLH/t_PHL = 0.5–2.7ns @ CL = 15pF) and robust off-state leakage (IO_Z ≤ ±10μA), with power-down capability ensuring high-impedance inputs/outputs when V_CC = 0V.

Key Specifications

Pinout & Package

Supplied in a 5-pin SC70 (C) package with exposed pad not electrically connected. Pin 1 (AIN) is input, Pin 2 (OE) is active-low output enable, Pin 3 (GND), Pin 4 (V_CC), Pin 5 (YOUT) is 3-state output.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-state buffer applications.

Compared with SN74LVC1G126DBVR and 74LVC1G125GW,125, the PI74ST1G126CEX offers lowest quiescent current (2μA) and tighter 1.8V V_CC optimization, making it optimal for battery-powered 1.8V logic interfaces where polarity preservation and minimal static power are critical.

Availability

PI74ST1G126CEX is available at Aetrix Electronics and suitable for mobile baseband interfaces, low-power sensor hubs, wearable display drivers, and industrial IoT edge nodes requiring stable component supply across extended temperature ranges.

Supply support for PI74ST1G126CEX 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 and timing solutions, acquired by Diodes Incorporated in 2016; legacy products maintain full datasheet compliance and long-term support.

The PI74ST1G126 belongs to the SOTiny™ Gate family, designed specifically for ultra-small-footprint, high-speed logic buffering in portable and space-constrained embedded systems.

FAQ

What is the maximum input voltage the PI74ST1G126CEX can tolerate?

The absolute maximum input voltage is –0.5V to +6V DC, independent of V_CC. This allows safe interfacing with 5V signals even when V_CC = 1.8V, provided input current remains within ±20mA limits per diode rating.

Does the PI74ST1G126CEX require external pull-up resistors on OE or YOUT?

No external pull-ups are required. The OE input has no internal pull-up; system-level pull-up is needed only if OE must default HIGH during power-up. YOUT is actively driven and does not float-no pull-up resistor is necessary for bus termination.

Can the PI74ST1G126CEX operate with V_CC = 1.6V?

No. The guaranteed operating range is strictly 1.8V to 3.6V. At 1.6V, DC parameters including V_IH, V_IL, and output drive fall outside specification, and AC timing (t_PD, t_PZL) is not characterized or guaranteed.

Is thermal derating required for continuous operation at 85°C ambient?

Yes. With SC70 package power dissipation rated at 150mW, junction temperature must remain ≤125°C. At 85°C ambient, maximum allowable power dissipation is ~85mW - achieved by limiting output load capacitance and switching frequency per CPD = 17pF and ICCD = CPD × V_CC × f_IN.