STMicroelectronics 74LVX20TTR

Overview

74LVX20TTR from STMicroelectronics is a low-voltage CMOS dual 4-input NAND gate with 5V-tolerant inputs, operating from 2V to 3.6V supply, delivering 4.1ns typical propagation delay at 3.3V, ±4mA symmetrical output drive, and 2µA max quiescent current - used in 3.3V logic interfacing between 5V and 3V systems.

For engineers reviewing the 74LVX20TTR datasheet, 74LVX20TTR pinout, 74LVX20TTR application, or 74LVX20TTR equivalent, key selection factors include 5V input tolerance, sub-3.6V operation, low-noise VOLP (0.3V typ), balanced tPLH/tPHL delays, and TSSOP-14 package compatibility with legacy 74-series footprints.

Technical Context

The device implements two independent 4-input NAND gates using sub-micron C2MOS technology with buffered outputs for high noise immunity. Each gate features power-down protection enabling 0–7V input acceptance regardless of VCC state, supporting hot-swap and mixed-voltage domain interfacing.

Input thresholds are fixed at VIH = 2.0V and VIL = 0.8V (at VCC = 3.0V), ensuring reliable TTL- and CMOS-level signal recognition. Output stages deliver matched |IOH| = |IOL| ≥ 4mA under 3.3V operation, enabling stable fanout into capacitive loads up to 50pF.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.4mm × 5.0mm body, 0.65mm pitch, 1.05mm max height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-input NAND gate applications.

Compared with SN74LVC20APWR and 74AHC20PW,118, the 74LVX20TTR uniquely supports 5V input tolerance *and* zero-VCC input survivability - making it the only option for mixed-voltage hot-swap interfaces requiring guaranteed safe operation during brownout or insertion events.

Availability

74LVX20TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical wearable sensor hubs, and IoT edge node power sequencing requiring stable component supply across extended temperature ranges.

Supply support for 74LVX20TTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad analog, digital, and MEMS portfolios.

The 74LVX series targets low-voltage, low-power 3.3V logic interfacing with 5V legacy systems - designed specifically for battery-operated, noise-sensitive, and mixed-voltage embedded applications.

FAQ

Can 74LVX20TTR operate with a 1.8V supply?

No. The recommended operating VCC range is 2.0V to 3.6V per datasheet Table 5. At 1.8V, input thresholds (VIH = 1.5V min) and output drive fall outside specification, risking unreliable logic transitions and increased static current. Data retention is supported down to 1.2V, but functional operation requires ≥2.0V.

Are pins 3 and 11 internally connected?

No. Pins 3 and 11 are explicitly marked "N.C." (Not Connected) in Table 2 and Figure 1. They have no internal bond wire or silicon connection. These pins must remain unconnected - tying them to GND or VCC may cause mechanical stress or unintended parasitic coupling in high-frequency layouts.

Does 74LVX20TTR require external pull-up resistors on inputs?

No. Inputs feature built-in protection diodes and are fully compatible with TTL- and CMOS-level driving sources. Pull-ups are unnecessary unless the application demands a defined state during system reset or power ramp-up - in which case, 10kΩ to VCC is sufficient and does not affect 5V-tolerance behavior.

What is the maximum capacitive load for specified tPD performance?

The 4.1ns typical propagation delay is measured with CL = 15pF (Table 8). Performance degrades linearly with load: at CL = 50pF, tPD increases to 6.6ns (typ). For designs requiring ≤5ns delay, total net capacitance - including PCB trace, probe, and downstream input - must be held below 20pF.