STMicroelectronics 74LVX27TTR

Overview

74LVX27TTR from STMicroelectronics is a low-voltage CMOS triple 3-input NOR gate with 5V-tolerant inputs, operating from 2V to 3.6V supply, delivering 4.1ns typical propagation delay at 3.3V, 4mA output drive, and 2µA max quiescent current - used in level-shifting logic interfaces between 5V and 3.3V systems.

For engineers reviewing the 74LVX27TTR datasheet, 74LVX27TTR pinout, 74LVX27TTR application, or 74LVX27TTR equivalent, key selection criteria include 5V input tolerance, symmetrical 4mA output drive, sub-5ns propagation delay at 3.3V, low-noise VOLP (0.3V typ), and power-down input protection for mixed-voltage system interfacing.

Technical Context

The 74LVX27TTR implements three independent NOR gates using sub-micron C2MOS technology with buffered outputs, enabling high noise immunity and stable switching across its 2V–3.6V operating range. Its input structure accepts 0–7V regardless of VCC, supporting robust 5V-to-3.3V translation without external clamping.

All inputs feature power-down protection and ESD immunity up to 2kV; output stages provide matched |IOH| = |IOL| ≥ 4mA, ensuring balanced rise/fall times and minimized skew (≤1.0ns typical) - critical for synchronous logic timing integrity in battery-powered and low-noise embedded control.

Key Specifications

Pinout & Package

TSSOP-14 package (4.9mm × 6.4mm × 1.05mm body height), lead pitch 0.65mm, JEDEC MO-153 compliant, RoHS-compliant matte tin finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple 3-input NOR gate applications.

Compared with SN74LVC27APWR and 74AHC27PW,118, the 74LVX27TTR uniquely supports 0–7V input tolerance with zero V_CC dependency and 2µA quiescent current - making it the only choice for unclamped 5V-to-3.3V translation in battery-constrained, high-reliability systems.

Availability

74LVX27TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, portable medical sensor interface, and automotive body control modules requiring stable component supply and long-term obsolescence management.

Supply support for 74LVX27TTR 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, designing and manufacturing microcontrollers, analog ICs, power management, and discrete components for industrial, automotive, and consumer markets.

The LVX logic family targets low-voltage, low-power, mixed-signal interfacing applications - specifically engineered for seamless 5V-to-3.3V translation with robust ESD and latch-up immunity in space-constrained embedded systems.

FAQ

Can 74LVX27TTR operate with V_CC = 1.8V?

No. The recommended operating V_CC range is strictly 2.0V to 3.6V per Table 5. At 1.8V, DC parameters including V_OH, V_OL, and noise margins fall outside specification, and propagation delay increases unpredictably. Data retention is supported down to 1.2V, but functional operation requires ≥2.0V.

Is 74LVX27TTR pin-compatible with standard 74LS27?

Yes - it is functionally and physically pin-compatible with the 74-series 27 triple 3-input NOR gate in TSSOP-14, sharing identical pin numbering and logic truth table. However, it is not electrically compatible with LS TTL due to CMOS input thresholds and lower drive strength; interface design must account for V_IL/V_IH differences.

What is the maximum capacitive load this device can drive reliably?

The datasheet specifies AC performance up to 50pF load (Table 7). With CL = 50pF, t_PLH/t_PHL remains ≤9.0ns at 3.3V. Driving >50pF increases propagation delay nonlinearly and may degrade VOLP/VOLV noise margins; for >50pF loads, buffer staging or reduced edge rate is recommended.

Does 74LVX27TTR require external pull-up or pull-down resistors on unused inputs?

No. Unused inputs may be tied directly to V_CC or GND. The device features low input leakage (±1µA max) and built-in power-down protection, so floating inputs are not permitted - they must be terminated to avoid undefined logic states and increased ICC. No external resistors are needed for termination.