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NC7SZ126P5X

Non-inv buffer, 3-state output, 1.65-5.5V, 2.6ns tPD, +/-24mA drive, SC-70-5, OE active-high

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Manufacturer Part：

NC7SZ126P5X

Package：

SC-70-5 / SC-88A / SOT-353 (2.0 x 1.25 x 1.0 mm, 0.65mm pitch)

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Description

The NC7SZ126P5X from onsemi is a single non-inverting buffer with 3-state output from the TinyLogic UHS family in a 5-pin SC-70-5 (SC-88A) package. It operates from 1.65 V to 5.5 V with 2.6 ns typical propagation delay at 5 V, +/-24 mA output drive at 3 V (32 mA max), over-voltage tolerant inputs up to 5.5 V, and power-down high-impedance I/O. The output enable (OE) pin active-high enables the output; OE low puts output in high-Z. Operating temperature range is -40C to +85C. P5X suffix denotes SC-70 tape-and-reel (3000 units/reel).

The NC7SZ126 from onsemi’s TinyLogic UHS (Ultra-High Speed) family is a single non-inverting buffer with 3-state output. The NC7SZ126P5X is the SC-70-5 (SC-88A) tape-and-reel version with 3000 units per reel. It is also available in SOT-23-5 (M5X), MicroPak-6 (L6X), and UDFN-6 (FHX) packages.

When the output enable (OE) pin is HIGH, the buffer passes the input to the output with only 2.6 ns typical propagation delay at 5 V (4.3 ns max at 5.5 V). This makes the device essentially transparent to most timing budgets. When OE is LOW, the output enters a high-impedance state, allowing other devices to drive the same bus line.

The +/-24 mA output drive at 3 V (32 mA absolute maximum) provides substantial drive capability for a tiny SC-70 package, sufficient to drive multiple CMOS loads, LED indicators, or short PCB traces. The output can also sink/source current for active-low or active-high LED drive.

The 1.65 V to 5.5 V supply range covers all common logic voltages. Inputs tolerate voltages up to 5.5 V independently of VCC, enabling 5 V to 3.3 V voltage translation when the device is powered from 3.3 V. The output also tolerates voltages above VCC when in the 3-state condition, preventing damage when a bus is driven to a higher voltage by another device.

Power-down high-impedance on all I/O pins prevents backflow current when VCC is 0 V, critical for hot-swap and power-sequencing applications. The 2 uA typical quiescent current (10 uA max) minimizes power consumption.

The NC7SZ126 is the 3-state version of the NC7SZ125 (which has an active-low OE). Both are part of the TinyLogic UHS family, which also includes the NC7SZ126M5X (SOT-23-5) and NC7SZ126L6X (MicroPak-6) package options.

**CMOS Buffer with 3-State Output:** The NC7SZ126 uses a standard CMOS inverter chain (input stage + output stage) for the buffer function, with an additional enable/disable circuit for the 3-state output. When OE is HIGH, the output stage operates as a normal push-pull CMOS driver. When OE is LOW, both the PMOS and NMOS output transistors are turned off, creating a high-impedance state.

**Propagation Delay:** The 2.6 ns typical propagation delay at 5 V is achieved through optimized transistor sizing and advanced sub-micron CMOS technology. The delay increases at lower supply voltages due to reduced drive current. At 1.65 V, the typical delay is approximately 5-7 ns.

**Over-Voltage Tolerance:** Input protection circuitry allows input voltages up to 5.5 V regardless of VCC. When a voltage above VCC appears on an input, the internal ESD diode to VCC is reverse-biased, preventing current flow into the VCC rail. This enables 5 V signals to be received by a 3.3 V device.

**3-State Bus Operation:** Multiple NC7SZ126 devices can share a common bus line if only one device has OE HIGH at a time. The high-Z state prevents bus contention. The output in 3-state can also tolerate voltages above VCC, allowing mixed-voltage bus operation.

Pin Name Type Description
1 OE I Output enable (active HIGH); HIGH = output enabled (Y follows A); LOW = output high-impedance (Z); 5.5V over-voltage tolerant; must not float; CMOS input levels
2 A I Data input; non-inverting; 5.5V over-voltage tolerant; CMOS input levels; VIH = 0.7 VCC, VIL = 0.3 VCC at 2.3-5.5V
3 GND G Ground; connect to PCB ground plane
4 Y O Data output; non-inverting; 3-state; +/-24mA drive@3V; high-Z when OE=LOW or VCC=0V; tolerates voltage above VCC in 3-state
5 VCC P Supply voltage; 1.65V to 5.5V; bypass with 0.1uF ceramic to GND; 2uA typical ICC; 10uA max
Application Description
Bus Buffer with 3-State Control Buffer and enable/disable signals on shared bus; OE from chip select decoder; 2.6ns delay adds minimal latency; +/-24mA drive strengthens weak bus signals; multiple NC7SZ126 share one bus line
5V to 3.3V Voltage Translation Receive 5V signal and output at 3.3V level; device powered from 3.3V VCC; input tolerates 5.5V; output clamps to VCC; one-direction translation only; use for 5V sensor to 3.3V MCU interface
Hot-Swap Signal Isolation Isolate signals during card insertion; OE controlled by card-detect or power-good signal; power-down high-Z prevents backflow when VCC=0V; prevents unpowered card from loading the bus
Model Manufacturer Compatibility Key Difference
NC7SZ125P5X onsemi Active-Low OE Variant Same buffer but OE is active-low; OE=LOW enables output; use when active-low enable matches system logic; same SC-70-5 package
NC7SZ126M5X onsemi Package Variant Same function in SOT-23-5 package (3.0×1.5mm); larger footprint but easier hand-soldering; different pinout
SN74LVC1G126DCKR TI Functional Equivalent Non-inv buffer with 3-state; 1.65-5.5V; SC-70-5; TI-sourced alternative; similar performance
74LVC1G126GW-7 Diodes Inc Competitive Alternative Non-inv buffer with 3-state; 1.65-5.5V; SOT-353; lower cost; Diodes Inc-sourced
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