Texas Instruments SN74LVC257ARGYR

Overview

SN74LVC257ARGYR from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer with 3-state outputs, designed for 1.65V–3.6V V_CC operation. It supports mixed-voltage interfacing (inputs tolerate up to 5.5V), delivers 4.6ns max propagation delay at 3.3V, and features ±24mA output drive - enabling high-speed bus multiplexing in industrial I/O expanders and telecom infrastructure.

For engineers reviewing the SN74LVC257ARGYR datasheet, SN74LVC257ARGYR pinout, SN74LVC257ARGYR application, or SN74LVC257ARGYR equivalent, key selection criteria include its 16-pin VQFN (RGY) package, 3.3V-compatible 3-state outputs, voltage translation capability between 3.3V and 5V logic domains, and latch-up immunity exceeding 250mA per JESD17.

Technical Context

This device implements four independent 2:1 multiplexers sharing a common active-low output-enable (OE) control and select line (A/B). Each channel routes either input A or B to its corresponding Y output based on the A/B logic level, while OE places all outputs in high-impedance state when asserted high.

Its CMOS design enables rail-to-rail input tolerance (up to 5.5V regardless of V_CC), making it suitable as a bidirectional level translator in mixed-supply systems. The 3-state outputs prevent bus contention during enable/disable transitions, and ground bounce (VOLP < 0.8V) and undershoot (VOHV > 2V) are characterized at 3.3V/25°C.

Key Specifications

Pinout & Package

VQFN-16 (RGY) package: 4mm × 3.5mm body size, exposed thermal pad, 0.5mm pitch, RoHS-compliant NIPDAU finish, MSL Level-2 (260°C, 1 year).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiplexer applications.

Compared with SN74LVC157ARGYR and 74LVC257PW, the SN74LVC257ARGYR uniquely combines 5.5V input tolerance, VQFN-16 compactness, and 87.1°C/W thermal performance - making it optimal for high-density, mixed-voltage telecom and industrial control applications requiring minimal layout area and robust interoperability.

Availability

SN74LVC257ARGYR is available at Aetrix Electronics and suitable for cable modem termination systems, network switches, and telecom infrastructure requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.

Supply support for SN74LVC257ARGYR 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 leader specializing in analog and embedded processing solutions, with decades of experience in logic, interface, and power management ICs.

The SN74LVC257A product line targets high-speed, low-voltage digital signal routing in mixed-supply systems - specifically engineered for industrial automation, communications equipment, and test instrumentation where voltage translation and bus isolation are critical.

FAQ

What is the maximum input voltage rating for SN74LVC257ARGYR?

The SN74LVC257ARGYR accepts input voltages up to 5.5V regardless of V_CC level, enabling safe interfacing with 5V logic families while operating from as low as 1.65V. This overvoltage tolerance is confirmed in Section 5.1 Absolute Maximum Ratings and Section 5.3 Recommended Operating Conditions of the official TI datasheet SCAS294Q. No external clamping is required when connecting to 5V sources, simplifying system-level design.

Does SN74LVC257ARGYR support level translation between 3.3V and 5V systems?

Yes, SN74LVC257ARGYR supports bidirectional level translation: its inputs tolerate 5.5V while V_CC operates from 1.65V to 3.6V, and outputs swing rail-to-rail within the V_CC range. As stated in Section 7.3 Feature Description, this allows use as a translator in mixed 3.3V/5V environments. The SN74LVC257ARGYR maintains signal integrity without external components, provided OE and A/B control signals are referenced to the same V_CC domain.

What is the thermal resistance (R_θJA) of SN74LVC257ARGYR in its VQFN package?

The junction-to-ambient thermal resistance (R_θJA) for SN74LVC257ARGYR in the RGY (VQFN-16) package is 87.1°C/W, as specified in Section 5.4 Thermal Information of the TI datasheet SCAS294Q. This value assumes standard JEDEC 2-layer board conditions and confirms suitability for thermally constrained applications such as dense telecom modules, where efficient heat dissipation from the exposed thermal pad is critical.

How does the output-enable (OE) pin function on SN74LVC257ARGYR?

The OE pin on SN74LVC257ARGYR is an active-high control that places all four Y outputs in high-impedance state when driven high, and enables normal multiplexing operation when low. Per the Function Table in Section 7.4, OE = H forces Y = Z (high-Z) regardless of A/B or input states. To ensure defined high-Z during power-up, TI recommends tying OE to V_CC via a pullup resistor, as noted in Section 7.3 Feature Description.

Is SN74LVC257ARGYR pin-compatible with other members of the SN74LVC257A family?

Yes, SN74LVC257ARGYR shares identical pinout and functionality with all other SN74LVC257A variants in 16-pin packages (e.g., D, DB, PW, BQB), including matching signal assignments for 1A–4B, 1Y–4Y, A/B, OE, V_CC, and GND. Pin Configuration Figures 4-1 and 4-2 in the TI datasheet SCAS294Q confirm consistent numbering across RGY, BQB, D, DB, NS, and PW packages - enabling drop-in substitution where package mounting constraints allow.