Nexperia USA Inc. 74LVC8T245PW,118

Product Summary

The Nexperia 74LVC8T245PW,118 is an 8-bit dual supply translating transceiver that occupies an essential role in advancing digital systems where multiple voltage domains coexist. Housed in a compact 24-pin TSSOP (Thin Shrink Small Outline Package), this device is engineered for high-speed, low-power bidirectional voltage level translation between different logic supply levels ranging from 1.2 V to 5.5 V. The 74LVC8T245PW,118, a member of the 74LVC8T245 and 74LVCH8T245 product series, provides seamless data bus direction control and three-state outputs, making it ideal for mixed-voltage systems, advanced backplane interconnects, and portable applications.

Main Features and Technical Specifications of the 74LVC8T245PW,118

The 74LVC8T245PW,118 boasts a series of technical features tailored for robust signal interfacing:

Dual independent supply pins ($V_{CC(A)}$ and $V_{CC(B)}$) support any voltage from 1.2 V to 5.5 V, allowing translation between popular logic families (from 1.2 V to 5.0 V).

High-speed capability, achieving a maximum data rate of up to 420 Mbps for 3.3 V to 5.0 V translation.

JEDEC standards compliance across multiple voltage domains, ensuring interoperability with JESD8-7, JESD8-5, JESD8C, and JESD36 specifications.

3-state outputs facilitate efficient bus sharing and isolation, essential for multi-master and power-sensitive architectures.

Low static current consumption, typically under 30 μA.

Robust protection features: ESD protection (HBM > 4000 V, CDM > 1000 V), latch-up immunity (>100 mA, JESD 78B Class II), and partial power-down support via IOFF circuitry.

These highlights establish the 74LVC8T245PW,118 as a versatile, reliable choice for system designers tasked with integrating devices of disparate logic voltages, while meeting rigorous industrial standards and performance needs.

Electrical Properties and Recommended Operating Parameters for the 74LVC8T245PW,118

A major consideration in choosing a voltage translating transceiver is its electrical behavior under real-world conditions. The 74LVC8T245PW,118 supports independent voltage supply rails for its A and B ports, with both capable of operation between 1.2 V and 5.5 V. The direction (DIR) and output enable (OE) functions are always referenced to the A-side supply.

Absolute maximum ratings should never be exceeded to ensure device integrity, with maximum input and output voltages capped at VCC + 0.5 V. Typical recommended operating conditions include the requirement that all GND pins are tied to the system ground, with precise current and voltage limits per input/output to maintain device reliability. Partial power-down capability—a critical asset for modern low-power architectures—is made possible by the internal IOFF protection, which prevents damage or unintentional current flow when one supply is powered down.

Functional Overview and Logic Operations of the 74LVC8T245PW,118

At its core, the 74LVC8T245PW,118 functions as a bidirectional transceiver with configurable direction and output enable inputs. Two 8-bit data ports—A and B—connect through controlled buffers, with the direction (DIR) input dictating the data flow (A-to-B or B-to-A), and the OE input controlling whether the outputs are active or at high-impedance.

Engineers can implement both unidirectional and true bidirectional logic level shifting, essential for applications such as microcontroller-to-peripheral communication, backplane busing, and voltage domain bridging. The 74LVCH8T245 variant further incorporates active bus-hold circuits, securing floating data lines at valid logic levels and further simplifying system design by reducing the need for external pull-up/down resistors.

Dynamic Behavior and Timing Specifications of the 74LVC8T245PW,118

Dynamic considerations—propagation delay, data throughput, and response to capacitive loads—are critical in evaluating level translators for high-frequency buses or fast digital interfaces. The 74LVC8T245PW,118 delivers propagation delays as low as a few nanoseconds depending on voltage and load, with maximum translation rates ranging from 60 Mbps (1.5 V) to 420 Mbps (3.3 V/5 V translation).

Detailed timing diagrams, propagation performance across varying $V_{CC}$ and capacitive loads, and enable/disable timing (critical for bus arbitration and power management) are characterized, supporting reliable operation in time-sensitive data transfer scenarios. The 74LVC8T245PW,118 achieves these speeds with consistent output drive strength (±24 mA at 3.0 V), supporting demanding signal integrity needs in dense PCBs and multi-drop bus structures.

Application Recommendations for the 74LVC8T245PW,118

Typical engineering use cases for the 74LVC8T245PW,118 include interfacing FPGAs, ASICs, or microprocessors operating at different logic voltages, or enabling communication between legacy 5 V logic and modern low-voltage circuitry. For unidirectional level-shifting, the DIR pin is statically set; for bidirectional links, DIR is toggled according to communication direction.

Special attention must be paid to power-up sequencing: while the device is tolerant of flexible sequencing (as long as GND is applied first), ensuring all unused inputs are at defined logic levels remains essential for noise immunity. The ability to place both A and B ports in a high-impedance OFF-state during suspend or power-down modes is vital for hot-swapping or low-power architectures.

Package Specifications and Physical Dimensions of the 74LVC8T245PW,118

The 74LVC8T245PW,118 is offered in multiple package options to support a range of assembly requirements:

TSSOP24 (SOT355-1): 24-pin, 0.65 mm pitch, 4.4 mm body width, optimized for compact PCBs.

DHVQFN24 (SOT815-1): 24-terminal, very thin, QFN-style (3.5 x 5.5 x 0.85 mm), providing enhanced thermal performance and high I/O density.

DHXQFN24 (SOT8024-1): Extreme thin dual in-line compatible QFN, 2 x 4 x 0.48 mm body with 0.4 mm pitch, suitable for space-constrained or high-density applications.

Precise package dimensions, mechanical pad locations, and soldering recommendations are critical for reliable PCB layout, particularly in high-speed/low-voltage environments.

Alternative and Substitute Models for the 74LVC8T245PW,118

For engineers or procurement teams seeking form-fit-function alternatives, the 74LVCH8T245 from Nexperia serves as a direct family alternative, differing mainly in the incorporation of active bus-hold functionality. When considering cross-references, ensure that both the electrical parameters (such as supply voltage range, propagation delay, and drive strength) and package compatibility meet design requirements. Compatibility with JEDEC logic level translation standards is a key consideration when evaluating any alternative.

Conclusion

The Nexperia 74LVC8T245PW,118 stands out as a robust, high-performance solution for voltage translation and bus interfacing in modern, mixed-voltage digital systems. Combining wide voltage flexibility, fast switching, low-power operation, and strong protection features, it meets the critical needs of system designers facing increasingly complex interface requirements. By understanding its full capabilities, recommended operating constraints, and application-specific design guidelines, engineers and procurement professionals can ensure optimal integration of the 74LVC8T245PW,118 into their next-generation products.