NC7SZ125M5X
NC7SZ125M5X - UHS Single Buffer, 3-State, SOT-23-5 | onsemi
The onsemi NC7SZ125M5X is a single non-inverting buffer with 3-STATE capability, fabricated with advanced CMOS technology to deliver ultra-high speed (UHS) switching with high output drive while maintaining low static power dissipation. Housed in a 5-pin SOT-23 (M5) surface-mount package, the device operates across a wide 1.65 V to 5.5 V VCC range, supports ±24 mA output drive at 5 V, and features a typical propagation delay of approximately 2.6 ns at 5 V VCC, making it well suited for high-speed signal conditioning in mixed-voltage systems. The 3-STATE output is controlled by an active-low output enable (OE) pin, allowing bus-oriented applications and easy interface to microcontrollers, ASICs, and FPGAs.
A non-inverting buffer (also called a line driver or signal repeater) is a single-input, single-output logic function that reproduces the logic level present at its input at the output, providing current gain and isolation between a weak source and a heavier load. Within the broader logic IC hierarchy, this part belongs to the TinyLogic UHS family from onsemi, a subset of CMOS logic gates that trade absolute speed for low power consumption. The 3-STATE output allows multiple buffers to share a common bus, with the disabled buffer entering a high-impedance state to avoid contention. The SOT-23-5 package is one of the most ubiquitous footprints in modern surface-mount design.
Key features of the NC7SZ125M5X include balanced propagation delays, very low quiescent current (typically 1 µA at room temperature), ±24 mA output drive at 5 V (enabling direct drive of LEDs or small relays), and a wide VCC operating range that makes it compatible with 1.8 V, 2.5 V, 3.3 V, and 5 V logic families. The device contains a single Schmitt-trigger input, providing hysteresis for slow or noisy input edges. Tape and reel packaging (suffix X) supports high-volume automated assembly.
From a technical perspective, the NC7SZ125M5X uses a standard CMOS push-pull output stage. The output enable pin OE is internally pulled high through a weak pull-up, so the output remains in high-impedance until actively driven low. Input structures tolerate voltages up to 5.5 V regardless of VCC, allowing level translation between 1.8 V and 5 V domains. ESD protection exceeds 2000 V HBM per industry standards, and latch-up immunity is rated above 100 mA per JESD78.
Typical applications include signal buffering between low-drive microcontroller GPIOs and heavier loads such as LEDs, level translation between mixed-voltage logic domains (e.g., 1.8 V to 3.3 V), bus isolation and multiplexing in distributed systems, and general-purpose logic inversion-free signal restoration in handheld and battery-powered designs. In industrial PLCs, it isolates backplane logic from field-side noise. In consumer audio and wearables, it buffers buttons or I2C lines between SoCs and accessory connectors.
When designing with this part, ensure OE is driven to a defined logic level rather than left floating, especially in noisy environments, to avoid inadvertent bus contention. Place a 0.1 µF decoupling capacitor close to the VCC pin to suppress logic-stage switching transients, and avoid exceeding the absolute maximum VCC of 6 V. This TinyLogic buffer excels where a single-bit driver, three-state capability, and tiny footprint are required simultaneously.
This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, comparison parameters, and practical design notes that go beyond what is printed in the manufacturer datasheet alone, giving engineers a faster path from selection to validated PCB layout.
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