Texas Instruments SN74LVC1G38DCKRG4

Overview

SN74LVC1G38 from Texas Instruments is a single 2-input NAND gate with open-drain output, designed for voltage translation and wired-OR logic applications. It operates from 1.65V to 5.5V V_CC, supports 5V-tolerant inputs up to 5.5V, delivers ±24mA output drive at 3.3V, achieves 4.5ns max propagation delay at 3.3V/CL=30pF, and features I_off for partial-power-down protection-used in HDMI hot-plug detection, I²C bus buffering, and level-shifting interfaces.

For engineers reviewing the SN74LVC1G38 datasheet, SN74LVC1G38 pinout, SN74LVC1G38 application, or SN74LVC1G38 equivalent, key selection criteria include open-drain compatibility with pull-up networks, overvoltage-tolerant inputs, I_off-enabled system power sequencing, and SOT-SC70-5 package suitability for space-constrained consumer electronics PCBs.

Technical Context

The SN74LVC1G38 implements positive-logic Boolean function Y = A • B (or Y = Ā + B̅) using standard CMOS input stages and an open-drain NMOS output stage. Its I_off circuitry actively disables all I/O pins when V_CC = 0V, limiting leakage to ±10µA across –40°C to +125°C.

Input voltage tolerance extends to 5.5V independent of V_CC, enabling robust interfacing between mixed-voltage domains. The output supports both up-translation (e.g., 1.8V input → 5V output via external pull-up) and down-translation (e.g., 5V input → 3.3V output), with switching performance validated at CL = 15pF, 30pF, and 50pF loads across full temperature range.

Key Specifications

Pinout & Package

SN74LVC1G38DCKRG4 uses the DCK (SOT-SC70-5) package: 2.0mm × 2.1mm body, 2.0mm × 1.25mm footprint, 0.65mm pitch, 5-pin surface-mount configuration with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G38DCKRG4, SN74LVC1G00DCKRG4 lacks bus-sharing capability and fails in partial-power-down scenarios, while NC7SZ03P5X sacrifices thermal robustness and drive strength-making SN74LVC1G38DCKRG4 the optimal choice for extended-temperature, mixed-voltage, and fault-tolerant designs.

Availability

SN74LVC1G38DCKRG4 is available at Aetrix Electronics and suitable for HDMI interface design, I²C bus extension, and smoke detector interconnect requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74LVC1G38DCKRG4 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

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in logic, power management, and signal chain solutions.

The SN74LVC1G38 belongs to TI's LVC low-voltage CMOS logic family, engineered for interoperability across voltage domains, low static power, and robust ESD performance in consumer, industrial, and automotive applications.

FAQ

What is the maximum operating temperature for SN74LVC1G38DCKRG4?

The SN74LVC1G38DCKRG4 is specified for continuous operation from –40°C to +125°C ambient temperature. This extended range is validated across all electrical parameters including propagation delay, output drive, and I_off leakage, making SN74LVC1G38DCKRG4 suitable for under-hood automotive modules and industrial control enclosures where thermal margins are critical.

Does SN74LVC1G38DCKRG4 support 5V-tolerant inputs when powered from 1.8V?

Yes. SN74LVC1G38DCKRG4 accepts input voltages up to 5.5V regardless of V_CC level-including when V_CC = 1.8V. This overvoltage tolerance is achieved through internal clamp diodes and is explicitly guaranteed in the Absolute Maximum Ratings table, allowing SN74LVC1G38DCKRG4 to safely interface with 5V peripherals without external protection.

Can SN74LVC1G38DCKRG4 replace a standard push-pull NAND gate in existing designs?

SN74LVC1G38DCKRG4 can replace a push-pull NAND only if the circuit relies on open-drain functionality-such as wired-OR buses, I²C, or level translation. Its open-drain output requires an external pull-up resistor; omitting it will result in undefined HIGH states. For pure logic inversion without bus sharing, SN74LVC1G00DCKRG4 is the functional push-pull equivalent of SN74LVC1G38DCKRG4.

What is the purpose of I_off in SN74LVC1G38DCKRG4, and how does it behave during power loss?

I_off in SN74LVC1G38DCKRG4 disables all input and output pins when V_CC drops to 0V, limiting leakage current to ±10µA. During power loss, this prevents back-driving of powered-down sections by live signals on A, B, or Y pins-protecting downstream circuitry and ensuring predictable system reset behavior. This feature is essential in multi-rail systems like SSD controllers and network projectors.

Is SN74LVC1G38DCKRG4 compatible with 15pF and 30pF load capacitances?

Yes. SN74LVC1G38DCKRG4 switching characteristics are fully characterized for CL = 15pF, 30pF, and 50pF loads across –40°C to +125°C. At 3.3V and CL = 30pF, t_pd is 1.4ns (typ) to 4.5ns (max), confirming reliable operation in typical PCB trace and fanout scenarios. These values are published in Sections 5.6 and 5.7 of the official SN74LVC1G38 datasheet.