STMicroelectronics 74AC04TTR

Overview

74AC04TTR from STMicroelectronics is a high-speed CMOS hex inverter with 6 independent inverting buffers, operating across 2V–6V supply, delivering 4ns typical propagation delay at 5V, ±24mA symmetrical output drive, and 2µA max quiescent current at 25°C - used in digital logic level translation, clock buffering, and signal inversion in industrial control and instrumentation systems.

For engineers reviewing the 74AC04TTR datasheet, 74AC04TTR pinout, 74AC04TTR application, or 74AC04TTR equivalent, key selection criteria include transmission-line driving capability (50Ω), balanced tPLH/tPHL delays, latch-up immunity, ESD tolerance (2kV), and TSSOP-14 package compatibility with space-constrained PCB layouts.

Technical Context

The 74AC04TTR implements six independent CMOS inverter stages using sub-micron C2MOS technology with three-stage internal buffering to ensure high noise immunity (28% VCC) and stable rail-to-rail switching. Each gate features symmetrical output impedance and supports incident-wave switching on 50Ω transmission lines.

It operates over –55°C to +125°C with guaranteed AC performance at VCC = 3.3V (±0.3V), 4.5V (±0.5V), and 5.5V (±0.5V); input thresholds scale with VCC (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC), enabling robust interfacing across mixed-voltage logic domains.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9mm × 6.4mm body, 0.65mm pitch, 1.1mm height, lead-free, moisture sensitivity level 1 (MSL1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverter applications.

Compared with SN74AC04PW and 74LVC04AD,118, the 74AC04TTR uniquely combines full –55°C to +125°C operation, 2kV HBM ESD, and explicit 50Ω transmission-line drive validation - making it the only choice for ruggedized industrial and automotive signal conditioning where reliability trumps marginal speed gain.

Availability

74AC04TTR is available at Aetrix Electronics and suitable for industrial PLC I/O conditioning, automotive body control modules, and test equipment signal generation requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for 74AC04TTR 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 analog, digital, and mixed-signal ICs for automotive, industrial, and power-management applications.

The 74AC logic family targets high-speed, low-power, and high-noise-immunity digital interface solutions - specifically engineered for robust operation in harsh electrical environments where legacy TTL and modern CMOS must coexist.

FAQ

Is 74AC04TTR pin-compatible with standard 74LS04 or 74HC04?

Yes - it is functionally and pinout-compatible with the entire 74xx04 series, including 74LS04 and 74HC04. All share identical 14-pin DIP/SO/TSSOP layouts and truth tables. However, 74AC04TTR offers superior speed (4ns vs. 15ns for LS, 8ns for HC), lower ICC, and higher drive strength, requiring no design changes for drop-in replacement in most cases.

Can 74AC04TTR operate reliably at 2.5V supply?

Yes - its specified VCC operating range is 2V to 6V, and DC/AC parameters are guaranteed down to 2V. At 2.5V, VOH remains ≥2.2V (IOH = –24mA), VOL ≤0.45V (IOL = 24mA), and tPD increases to ~7ns (typ). It meets all logic thresholds (VIH ≥1.75V, VIL ≤0.75V) and retains full 2kV HBM ESD protection.

Does 74AC04TTR require external pull-up or pull-down resistors on unused inputs?

No - unused inputs must be tied HIGH or LOW (not left floating), but no external resistors are needed. The device's CMOS inputs have negligible leakage (±0.1µA), so direct connection to VCC or GND suffices. Floating inputs cause increased ICC, oscillation, and potential thermal overstress due to linear-region conduction in both FETs.

What is the maximum capacitive load the 74AC04TTR can drive without signal integrity degradation?

Driving CL ≤ 50pF is validated per AC specs (tPD, VOH/VOL). With heavier loads (e.g., 100pF), tPD increases by ~1.5ns per 20pF beyond 50pF, and ringing may occur without proper transmission-line termination. For >50pF, use series-source termination or reduce edge rate via input RC filtering - never exceed 200pF total load without redesign.