STMicroelectronics 74VHC03TTR

Overview

74VHC03TTR from STMicroelectronics is a quad 2-input open-drain NAND gate in TSSOP-14 package, operating from 2V to 5.5V, with 3.7ns typical propagation delay at 5V, 2µA max quiescent current, and 2kV ESD immunity. It serves as a level-shifting current sink for LED driving, wired-AND bus interfacing, and 5V-to-3V logic translation.

For engineers reviewing the 74VHC03TTR datasheet, 74VHC03TTR pinout, 74VHC03TTR application, or 74VHC03TTR equivalent, key selection factors include open-drain output drive capability, input overvoltage tolerance up to 7V independent of VCC, latch-up immunity, noise margin (28% VCC), and compatibility with legacy 74-series logic timing and function.

Technical Context

The 74VHC03TTR implements four independent NAND gates with open-drain outputs, requiring external pull-up resistors for wired-AND or bus arbitration. Its C2MOS process enables rail-to-rail input voltage acceptance (–0.5V to +7.0V) regardless of VCC, supporting mixed-voltage system interfacing.

All inputs feature power-down protection and integrated ESD clamps; outputs tolerate 0V to VCC+0.5V. The three-stage buffered architecture ensures stable switching and high noise immunity (VIH/VIL thresholds fixed at 0.7VCC/0.3VCC across 3.0–5.5V).

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9mm × 6.4mm body, 0.65mm pitch, 1.2mm height, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar open-drain NAND gate applications.

Compared with SN74LVC03APWR and 74AHC03PW,118, the 74VHC03TTR uniquely balances 7V input tolerance, ultra-low ICC, and proven latch-up immunity-making it optimal for mixed-voltage industrial interfaces where supply sequencing and ESD robustness are critical.

Availability

74VHC03TTR is available at Aetrix Electronics and suitable for LED driver interfaces, wired-AND bus arbitration, and 5V-to-3V logic translation requiring stable component supply and long-term industrial availability.

Supply support for 74VHC03TTR 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 consumer markets.

The 74VHC logic family targets high-speed, low-power, and robust interface solutions for industrial control, instrumentation, and legacy-system upgrades where reliability across voltage domains is essential.

FAQ

Can the 74VHC03TTR be used with a 3.3V supply and 5V pull-up resistor?

Yes. Its inputs tolerate up to 7V independently of V_CC, and its open-drain outputs support any pull-up voltage ≤V_CC + 0.5V. With V_CC = 3.3V and 5V pull-up, the output high level reaches 5V, enabling seamless 3.3V-to-5V signal translation without additional components.

What is the maximum sink current per output at 25°C?

Each output can sink up to 8mA while maintaining V_OL ≤ 0.55V at V_CC = 4.5V and T_A = 25°C. At 5.5V V_CC, the absolute maximum DC output current is ±25mA, but sustained operation above 8mA requires thermal derating per the package's power dissipation limits.

Does the 74VHC03TTR support hot insertion when V_CC is unpowered?

Yes. Power-down protection on all inputs prevents back-driving the V_CC rail when the device is unpowered. Inputs remain high-impedance and tolerate voltages from –0.5V to +7.0V even with V_CC = 0V, making it safe for hot-swap applications in modular backplane systems.

How does the 28% V_CC noise margin improve system reliability?

This specification guarantees that input high- and low-level noise immunity is at least 28% of the supply voltage - e.g., 1.4V noise margin at V_CC = 5V. It ensures reliable logic recognition in electrically noisy environments like motor drives or relay-controlled panels, reducing false triggering without external filtering.