NXP Semiconductors 74ALVC164245BX,518

Overview

74ALVC164245BX,518 from Nexperia is a 16-bit dual-supply translating transceiver in TSSOP48 package, enabling bidirectional level translation between 3 V (VCC(A): 1.5–3.6 V) and 5 V (VCC(B): 1.5–5.5 V) buses. It features two independent 8-bit channels (1A/1B and 2A/2B), non-inverting 3-state outputs, and direction control via active-HIGH DIR inputs. Used in mixed-voltage system interconnects such as industrial PLC backplanes and legacy 5 V microcontroller-to-3.3 V FPGA interfaces.

For engineers reviewing the 74ALVC164245BX,518 datasheet, 74ALVC164245BX,518 pinout, 74ALVC164245BX,518 application, or 74ALVC164245BX,518 equivalent, this page delivers verified electrical specs, validated pin functions, real-world bus interface use cases, and confirmed alternative parts with documented voltage and timing differences - all extracted from Nexperia's Rev. 13 (24 April 2024) product data sheet.

Technical Context

This device implements dual-rail CMOS logic with separate VCC(A) and VCC(B) supplies, allowing true bidirectional voltage translation without external biasing. Each channel uses dedicated DIR and OE controls: nDIR (active HIGH) enables A→B flow; inverted logic enables B→A flow. The IOFF circuit ensures high-impedance isolation when either supply is at 0 V, preventing current backflow during suspend mode.

Input clamping tolerates up to 5.5 V on all pins regardless of VCC(A), enabling direct TTL-level interfacing. Propagation delays are asymmetric: tpd(A→B) ranges from 1.0 ns (3.3 V → 5 V) to 7.6 ns (2.3 V → 3.3 V); tpd(B→A) reaches 9.5 ns under worst-case low-voltage conditions. Static VIH/VIL thresholds scale with respective supply rails per JEDEC JESD8 standards.

Key Specifications

Pinout & Package

TSSOP48 (SOT362-1) package: plastic thin shrink small outline, 48 leads, 6.1 mm body width, 0.5 mm pitch, 1.2 mm max height. Pin 1 index marked by notch; pin 1 located at top-left corner when marking side faces up.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply translating transceiver applications.

Compared with SN74AVC16T245DGGR and 74LVC16245ADGG,118, the 74ALVC164245BX,518 uniquely supports true 5 V-tolerant B-side operation with IOFF and suspend-mode safety - making it the only option for robust 3 V/5 V mixed-bus industrial and automotive designs requiring zero external components.

Availability

74ALVC164245BX,518 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ALVC164245BX,518 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

Nexperia is a leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with core expertise in energy-efficient, reliable, and scalable solutions for industrial and automotive markets.

The 74ALVC family targets mixed-voltage system interconnects, delivering low-power, high-speed translation with robust ESD and latch-up immunity - specifically engineered for reliability-critical embedded control and data acquisition applications.

FAQ

Can 74ALVC164245BX,518 operate with VCC(A) = 2.5 V and VCC(B) = 5.0 V?

Yes. Per Table 5, VCC(A) supports 1.5 V to 3.6 V and VCC(B) supports 1.5 V to 5.5 V, with VCC(B) ≥ VCC(A) required for normal operation. At these voltages, VIH(A) = 1.7 V (min), VOH(B) = 4.45 V (min), and tpd(A→B) = 3.0 ns (typ), confirming full functionality in 2.5 V ↔ 5 V translation scenarios.

What happens to outputs when VCC(A) = 0 V but VCC(B) = 5 V?

Per Section 1, the IOFF circuit forces all A-side and B-side outputs into high-impedance state, preventing current flow from VCC(B) to the grounded A-rail. This suspend-mode behavior is verified in Table 4 (IOZ ≤ ±10 μA) and eliminates need for external isolation - critical for hot-swap and battery-backup systems.

Is pin 1DIR compatible with 3.3 V CMOS logic when VCC(A) = 1.8 V?

Yes. Table 5 specifies control input voltage range as 0 V to 5.5 V, independent of VCC(A). With VIH(min) = 2.0 V at VCC(A) = 3.0–3.6 V and 1.7 V at 2.3–2.7 V, a 3.3 V CMOS signal safely exceeds threshold even at lowest VCC(A) = 1.5 V, where VIH remains defined by absolute voltage (not ratio).

Does 74ALVC164245BX,518 support hot insertion into a live 5 V bus?

Yes - provided A-side is held in 3-state before insertion. The device's overvoltage-tolerant inputs (5.5 V max) and IOFF circuit ensure no damage occurs when B-side pins contact live 5 V, and outputs remain high-Z until VCC(A) stabilizes and OE is asserted - satisfying IEC 61000-4-2 Level 3 (8 kV contact) requirements.