onsemi NC7SZ126M5

Overview

NC7SZ126M5 from ON Semiconductor is a single-channel, three-state buffer IC in the TinyLogic® UHS family, designed for level translation and bus isolation in space-constrained digital systems. It operates across 1.65V–5.5V V_CC, delivers ±24mA output drive at 3V, and achieves 2.6ns typical propagation delay into 50pF at 5V - enabling high-speed signal routing in low-voltage microcontroller I/O expansion and FPGA configuration interfaces.

For engineers reviewing the NC7SZ126M5 datasheet, pinout, applications, or equivalent options, key selection criteria include its over-voltage tolerant inputs (up to 6V), 5-pin SOT23 package footprint, three-state control timing (t_PZL/t_PHZ ≤ 6.0ns at 5V), and compatibility with mixed-supply logic domains in portable and industrial embedded designs.

Technical Context

The NC7SZ126M5 implements a single non-inverting buffer with active-high three-state enable (OE), where output Y follows input A when OE is HIGH and enters high-impedance when OE is LOW. Its CMOS design supports rail-to-rail input voltage tolerance independent of V_CC, allowing 5V-tolerant inputs to interface safely with 1.8V/2.5V/3.3V logic while driving loads up to ±24mA.

Propagation delay (t_PLH/t_PHL) scales inversely with V_CC: 4.5ns max at 5V, 5.5ns max at 3.3V, and 13.8ns max at 1.65V (CL = 15pF). Output enable/disable times (t_PZL, t_PHZ) are specified down to 5.0ns at 5V with 50pF load, supporting fast bus arbitration in multi-master systems.

Key Specifications

Pinout & Package

NC7SZ126M5 is housed in a 5-lead SOT23 package (JEDEC MO-178, 1.6mm body width) with gull-wing leads and 0.95mm pitch. The package supports reflow soldering per J-STD-020 and has θ_JA = 300°C/W for thermal management in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125DBVR and 74AUP1G125GW,518, the NC7SZ126M5 uniquely combines 6V input tolerance, 2.6ns speed at 5V, and ±24mA drive in a 5-pin SOT23 - making it optimal for mixed-voltage, high-speed bus isolation where reliability and timing margin are critical.

Availability

NC7SZ126M5 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, FPGA configuration interfaces, and USB hub power management requiring stable component supply and JEDEC-compliant SOT23 packaging.

Supply support for NC7SZ126M5 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient electronics for automotive, industrial, cloud computing, and IoT applications.

The TinyLogic® UHS product line delivers ultra-high-speed, low-power logic functions in miniature packages - engineered specifically for signal integrity and voltage-domain bridging in space- and power-constrained embedded systems.

FAQ

What is the maximum input voltage rating for NC7SZ126M5, and how does it benefit system design?

The NC7SZ126M5 supports DC input voltages from −0.5V to 6.0V, independent of V_CC. This allows 5V signals to be safely applied to the device even when powered from 1.8V or 2.5V supplies - eliminating external clamping diodes or level translators in mixed-voltage interfaces. This feature directly enhances reliability in NC7SZ126M5-based designs interfacing legacy peripherals with modern low-voltage MCUs.

Does NC7SZ126M5 require pull-up or pull-down resistors on unused inputs?

Yes - per datasheet Note 1, all unused inputs on NC7SZ126M5 must be held HIGH or LOW and must not float. Floating inputs can cause increased ICC, erratic output behavior, or excessive power consumption due to internal gate metastability. For OE and A pins not in use, tie them to V_CC or GND via 10kΩ resistors or direct connection depending on required default state.

What is the thermal resistance (θ_JA) of the NC7SZ126M5 SOT23 package, and how does it affect power dissipation?

The NC7SZ126M5 in its 5-lead SOT23 package has a junction-to-ambient thermal resistance (θ_JA) of 300°C/W. At maximum rated power dissipation of 200mW (per Absolute Maximum Ratings), this yields a worst-case junction temperature rise of 60°C above ambient - well within the +150°C TJ limit. Proper PCB copper pour under the exposed pad (if used) and minimal trace length reduce effective θ_JA in practice.

Can NC7SZ126M5 drive a 50pF capacitive load at 5V while maintaining timing specifications?

Yes - the NC7SZ126M5 datasheet specifies t_PLH/t_PHL = 0.5ns (min) to 4.8ns (max) at V_CC = 5.0V ± 0.5V with CL = 50pF and RD = 500Ω. This confirms full timing compliance for driving typical PCB traces, connectors, and input capacitances found in high-speed digital interfaces - ensuring reliable operation of NC7SZ126M5 in 5V logic domains with realistic loading.

Is NC7SZ126M5 RoHS compliant and lead-free?

Yes - the NC7SZ126M5X ordering variant (which corresponds to NC7SZ126M5) is RoHS compliant and lead-free, as confirmed in the Ordering Information table. It meets EU Directive 2011/65/EU and is marked "RoHS" in the eco-status column. The device uses matte tin lead finish and conforms to JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) for unlimited floor life.