onsemi MC74VHC1G05DTT1G

Overview

MC74VHC1G05DTT1G from onsemi is a single unbuffered inverter with open-drain output, operating from 2.0 V to 5.5 V supply, featuring 3.5 ns typical propagation delay at V_CC = 5 V, −16 mA I_OH drive capability, and ESD protection exceeding 2 kV HBM. It serves as a level-shifting logic buffer in I²C bus pull-up interfaces and low-voltage sensor signal conditioning.

For engineers reviewing the MC74VHC1G05DTT1G datasheet, pinout, applications, or equivalent options, key selection criteria include open-drain compatibility with mixed-voltage I²C systems, guaranteed 5.5 V tolerant output, rail-to-rail input voltage range, and SOT-23-5 package footprint constraints.

Technical Context

This device implements a CMOS-based unbuffered inverter stage with no internal pull-up, requiring external termination for logic high assertion. Its output structure supports bidirectional communication on shared buses and enables wired-AND functionality in multi-master I²C topologies.

The input threshold is designed for TTL-compatible switching (V_IH = 2.0 V min, V_IL = 0.8 V max at V_CC = 3.3 V), and the output can sink up to 8 mA at V_OL ≤ 0.4 V while maintaining full 5.5 V tolerance on the drain node independent of V_CC.

Key Specifications

Pinout & Package

MC74VHC1G05DTT1G is housed in a 5-pin SOT-23 package (JEDEC MO-178AA), with 1.3 mm × 2.9 mm body size, 0.95 mm height, and 0.95 mm lead pitch. The package supports reflow soldering per J-STD-020 and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G05DBVR and 74AUP1G05GW,125, the MC74VHC1G05DTT1G offers balanced speed and drive strength in the widely adopted SOT-23-5 footprint, with superior 5.5 V output tolerance critical for mixed-voltage I²C interconnects where other alternatives require additional protection or level-shifting.

Availability

MC74VHC1G05DTT1G is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and consumer IoT gateways requiring stable component supply and long-term manufacturability.

Supply support for MC74VHC1G05DTT1G 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

onsemi is a global semiconductor leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC74VHC1G05DTT1G belongs to the VHC (Very High Speed CMOS) logic family, engineered for low-power, high-speed interface bridging in mixed-voltage digital systems with strict timing and reliability requirements.

FAQ

What is the maximum allowable voltage on the output pin of MC74VHC1G05DTT1G when V_CC = 3.3 V?

The MC74VHC1G05DTT1G output pin (pin 3) is rated for up to 5.5 V regardless of V_CC level. When V_CC = 3.3 V, the drain can safely interface with 5 V buses such as standard I²C, provided the external pull-up resistor is connected to the 5 V rail and the sink current remains within 8 mA. This 5.5 V tolerance is specified in the Absolute Maximum Ratings table of the official onsemi datasheet.

Can MC74VHC1G05DTT1G be used as a non-inverting buffer by adding an external inverter?

No - the MC74VHC1G05DTT1G is a fixed-function unbuffered inverter with open-drain output and cannot be reconfigured as a non-inverting buffer. Its logic function is hardwired; adding external logic would increase propagation delay, board area, and power consumption. For non-inverting open-drain applications, select a dedicated part such as MC74VHC1G07DTT1G, which is the buffer counterpart in the same VHC family.

Is pin 5 (NC) on MC74VHC1G05DTT1G required to be left floating, or can it be tied to GND?

Pin 5 is internally unconnected (NC) and must remain unconnected - neither tied to GND nor V_CC. onsemi's datasheet explicitly states "No internal connection" and warns against soldering or routing to any net, as doing so may cause unpredictable behavior or damage due to latent internal parasitics. PCB layout should omit pad connection or use a keep-out zone around pin 5.

Does MC74VHC1G05DTT1G support hot-swap or live-insertion on powered I²C buses?

The MC74VHC1G05DTT1G is not characterized for hot-swap operation. While its 5.5 V tolerant output and ESD protection provide some robustness, the device lacks explicit I²C bus fault protection (e.g., current limiting, bus contention detection) and has no power-on reset or input hysteresis for glitch immunity during insertion. Use only in systems where bus power sequencing is controlled and insertion occurs during maintenance windows or with auxiliary isolation circuitry.

What is the recommended pull-up resistor value for MC74VHC1G05DTT1G when used on a 400 kHz I²C bus with 200 pF total capacitance?

For a 400 kHz I²C bus with 200 pF load, the recommended pull-up resistor for MC74VHC1G05DTT1G is 2.2 kΩ when pulled to 3.3 V, or 3.9 kΩ when pulled to 5 V. These values ensure rise time < 300 ns (per I²C fast-mode spec) while keeping sink current below 8 mA. The calculation accounts for V_OL ≤ 0.4 V at 8 mA and uses τ = 0.847 × R × C to meet timing; actual value should be verified with scope measurements on the target board.