NXP Semiconductors 74LVTH32245EC,551

Overview

74LVTH32245EC,551 from NXP Semiconductors is a 3.3 V, 32-bit non-inverting bus transceiver with four independent 8-bit bidirectional channels, 3-state outputs, bus hold on all data inputs, and TTL-compatible I/O for mixed-voltage interfacing. It operates from −40 °C to +85 °C in an LFBGA96 package and supports live insertion in backplane or hot-swap applications.

For engineers reviewing the 74LVTH32245EC,551 datasheet, 74LVTH32245EC,551 pinout, 74LVTH32245EC,551 application, or 74LVTH32245EC,551 equivalent, key selection criteria include its ±64 mA/−32 mA drive strength, 1.0 ns typical propagation delay at 3.3 V, bus-hold input retention, quad-direction-control architecture, and 5 V-tolerant I/O capability without external pull-ups.

Technical Context

The 74LVTH32245EC,551 implements four independent 8-bit bidirectional transceiver channels, each controlled by dedicated nDIR (direction) and nOE (output enable) inputs. Its BiCMOS process enables TTL-level switching with 3.3 V supply while maintaining 5 V I/O tolerance.

Each channel supports simultaneous send/receive isolation via high-impedance 3-state outputs, and all 32 data inputs feature integrated bus-hold circuitry-eliminating external pull-up resistors and preventing floating states during idle or hot-plug events.

Key Specifications

Pinout & Package

LFBGA96 package: plastic low-profile fine-pitch ball grid array, 13.5 mm × 5.5 mm × 1.05 mm body, 96 solder balls, 0.5 mm pitch, JEDEC standard SOT536-1 outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit bus transceiver applications.

Compared with SN74LVT32245ZQLR and 74ALVCH32245QG, the 74LVTH32245EC,551 delivers superior drive strength and faster propagation-critical for high-speed backplane routing-while maintaining identical LFBGA96 mechanical compatibility and bus-hold functionality essential for hot-swap reliability.

Availability

74LVTH32245EC,551 is available at Aetrix Electronics and suitable for backplane routing, hot-swappable module interfaces, legacy voltage translation, and high-density memory bus buffering requiring stable component supply across industrial temperature ranges.

Supply support for 74LVTH32245EC,551 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The 74LVTH32245EC,551 belongs to NXP's high-performance LVTH logic family, engineered for robust 3.3 V bus interfacing in mission-critical industrial and telecom infrastructure where reliability, mixed-voltage compatibility, and hot-swap readiness are mandatory.

FAQ

What is the maximum operating frequency supported by the 74LVTH32245EC,551?

The 74LVTH32245EC,551 does not specify a maximum clock frequency, but its 1.0 ns typical propagation delay (tPLH/tPHL) at 3.3 V enables reliable operation in bus systems with cycle times down to ~2 ns. Real-world maximum frequency depends on load capacitance, trace length, and termination-designs with ≤50 pF load typically sustain >200 MHz data rates. The 74LVTH32245EC,551 datasheet confirms performance under recommended operating conditions only.

Does the 74LVTH32245EC,551 require external pull-up resistors on its data inputs?

No. The 74LVTH32245EC,551 integrates bus-hold circuitry on all 32 data input pins (1A[0:7] through 4B[0:7]), actively retaining the last valid logic state without external components. This eliminates the need for 32 discrete pull-up resistors, reducing BOM cost, PCB area, and potential signal integrity issues caused by resistor parasitics. The 74LVTH32245EC,551 bus-hold current is specified at ±75 µA to ±135 µA.

Can the 74LVTH32245EC,551 interface directly with 5 V logic systems?

Yes. The 74LVTH32245EC,551 features 5 V-tolerant inputs and outputs: VI and VO ratings extend to +7.0 V, and it accepts 0–5.5 V input levels while operating from a 3.3 V supply. Its TTL-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) ensure interoperability with standard 5 V CMOS/TTL devices without level shifters. This capability is explicitly validated in the 74LVTH32245EC,551 datasheet Section 8.

What is the thermal performance of the 74LVTH32245EC,551 in continuous operation?

The 74LVTH32245EC,551 has a maximum junction temperature (Tj) rating of 150 °C and total power dissipation (Ptot) of 1000 mW at Tamb ≤ 70 °C, derating linearly by 1.8 mW/K above that. Under typical conditions (VCC = 3.3 V, all outputs driving 24 mA), ICC is 8.4 mA (outputs LOW) or 0.14 mA (outputs disabled). Thermal design must account for the LFBGA96 package's 13.5 × 5.5 mm footprint and 1.05 mm height per JEDEC SOT536-1.

How does the 74LVTH32245EC,551 handle power sequencing during system startup?

The 74LVTH32245EC,551 incorporates power-up 3-state functionality: all outputs remain in high-impedance until VCC reaches a valid operating level (~2.0 V), preventing bus contention during power ramp. This behavior is guaranteed across −40 °C to +85 °C and eliminates need for external reset sequencing. The 74LVTH32245EC,551 also specifies IO(pu/pd) leakage current (±100 µA max) during VCC transitions, ensuring clean initialization.