STMicroelectronics 74VHC20TTR

Overview

74VHC20TTR from STMicroelectronics is a dual 4-input NAND gate in TSSOP-14 package, operating from 2V to 5.5V, with typical propagation delay of 3.3 ns at 5V, ±8 mA output drive, and 2 µA max quiescent current at 25°C. It enables logic-level translation between 3V and 5V systems in compact board space.

For engineers reviewing the 74VHC20TTR datasheet, 74VHC20TTR pinout, 74VHC20TTR application, or 74VHC20TTR equivalent, key selection criteria include input voltage tolerance (0–7V independent of VCC), ESD immunity (2 kV), symmetrical output drive, latch-up immunity, and compatibility with legacy 74-series logic footprints.

Technical Context

The device implements two independent 4-input NAND gates using sub-micron C2MOS technology with three-stage buffered outputs, delivering high noise immunity (VNIH/VNIL ≥ 28% VCC) and balanced tPLH/tPHL delays. Inputs accept 0–7V regardless of VCC, enabling robust level-shifting without external biasing.

All inputs feature power-down protection and diode clamping; outputs support ±8 mA drive into 15–50 pF loads. The internal structure includes static discharge protection on all I/O pins, achieving 2 kV HBM ESD rating per JEDEC JS-001.

Key Specifications

Pinout & Package

TSSOP-14 (Thin Shrink Small Outline Package), 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height. RoHS-compliant, tape-and-reel packaging (74VHC20TTR).

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 74HC20PW,118, the 74VHC20TTR uniquely supports 2–5.5V operation with 0–7V input tolerance and sub-4 ns speed-making it the only choice for reliable 3.3V/5V bridging in harsh environments.

Availability

74VHC20TTR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical patient monitor front-ends, and test equipment digital pattern generators requiring stable component supply across extended temperature ranges.

Supply support for 74VHC20TTR 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74VHC logic family targets high-speed, low-power, mixed-voltage digital interfacing applications where robustness, timing precision, and legacy compatibility are essential.

FAQ

Can 74VHC20TTR be used with a 3.3V supply while interfacing to 5V inputs?

Yes. Its inputs tolerate 0–7V regardless of VCC, allowing direct connection of 5V signals to a 3.3V-powered 74VHC20TTR. Output high-level voltage will be ~3.3V, meeting 3.3V logic thresholds, and no external components are required for level translation.

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

The 74VHC20TTR is characterized up to 50 pF load capacitance with guaranteed AC performance (tPLH/tPHL ≤ 8.0 ns at 5V). For loads exceeding 50 pF, propagation delay increases linearly; derating curves in the datasheet show measurable but usable operation up to 100 pF with appropriate timing margin.

Is Pin 3 (N.C.) electrically isolated inside the die?

Yes. Pin 3 (and Pin 11) are physically unconnected to any internal circuitry. They serve only as mechanical alignment aids in the TSSOP-14 package and must not be soldered to traces or biased-leaving them floating is the recommended practice per STMicroelectronics design guidelines.

Does this part support partial power-down operation?

Yes. Power-down protection on all inputs ensures they remain high-impedance and non-disruptive even when VCC = 0 V. This prevents back-driving of upstream logic and avoids unintended current paths during system sleep or reset sequences.