Texas Instruments SN74LVC157ARGYRG4

Overview

SN74LVC157ARGYRG4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in a 16-pin VQFN (RGY) package, operating from 1.65V to 3.6V supply, with 5.2ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and –40°C to 85°C temperature range. It routes four independent 2:1 data paths under common address (A/B) and strobe (G) control for bus selection and signal routing in low-voltage digital systems.

For engineers reviewing the SN74LVC157ARGYRG4 datasheet, SN74LVC157ARGYRG4 pinout, SN74LVC157ARGYRG4 application, or SN74LVC157ARGYRG4 equivalent, this page delivers verified electrical specs, thermal metrics, functional mode truth table, real-world layout guidance, and validated alternative options - all aligned to TI's SCAS292S production data sheet (December 2024 revision).

Technical Context

The SN74LVC157ARGYRG4 implements true (non-inverting) data selection logic with a common active-low output strobe (G) and shared address select (A/B). When G is high, all four Y outputs are forced low regardless of A/B or input states; when G is low, each Yn selects between An and Bn based on A/B level. Inputs tolerate up to 5.5V, enabling safe interfacing with 5V logic in mixed-voltage systems.

Its CMOS design supports rail-to-rail output swing (VOH ≥ VCC–0.2V, VOL ≤ 0.3V at 3.3V), exhibits low dynamic power (Cpd = 16pF at 3.3V), and maintains stable timing across –40°C to 85°C with tpd ≤ 5.2ns (3.3V) and tsk(o) ≤ 1.5ns. The RGY package features an exposed thermal pad (recommended tied to GND) and MSL Level-2 moisture sensitivity.

Key Specifications

Pinout & Package

VQFN-16 (RGY) package: 4mm × 3.5mm body, 0.5mm pitch, exposed thermal pad (pin 17, recommended connected to GND). RoHS-compliant, NIPDAU lead finish, MSL Level-2 (260°C, 1 year floor life).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.

Compared with SN74LVC157ADG4 and SN74LV157ADR, the SN74LVC157ARGYRG4 offers superior thermal performance (87.1°C/W vs. 118.1°C/W), smallest footprint (4mm × 3.5mm), and guaranteed 5.5V input tolerance across its full 1.65–3.6V supply range - making it optimal for space-constrained, mixed-voltage industrial PCBs.

Availability

SN74LVC157ARGYRG4 is available at Aetrix Electronics and suitable for industrial automation, FPGA configuration management, low-power wearable peripherals, and mixed-voltage signal routing requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for SN74LVC157ARGYRG4 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.

The SN74LVC157ARGYRG4 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for high-speed, low-power operation in 1.65–3.6V systems where signal integrity, voltage translation, and compact packaging are critical.

FAQ

What is the maximum clock/data rate supported by SN74LVC157ARGYRG4?

The SN74LVC157ARGYRG4 has a maximum propagation delay of 5.2ns at 3.3V, supporting data switching frequencies up to ~100MHz in well-designed PCB layouts. Real-world usable rate depends on load capacitance, trace length, and signal integrity margins - TI recommends limiting fan-out to ≤10 LVC loads and keeping traces under 2 inches for reliable 50MHz+ operation. The SN74LVC157ARGYRG4 is not a clocked device but a combinatorial multiplexer, so its speed is governed by tpd, not clock frequency.

Can SN74LVC157ARGYRG4 interface directly with 5V logic devices?

Yes. The SN74LVC157ARGYRG4 inputs are 5.5V-tolerant across its entire 1.65–3.6V supply range, allowing direct connection to 5V outputs without external level-shifting components. Outputs swing rail-to-rail (VOH ≥ VCC–0.2V, VOL ≤ 0.3V), so driving 5V-tolerant inputs is safe, but driving standard 5V TTL inputs may require verification of VIH/VIL thresholds. The SN74LVC157ARGYRG4 is commonly used in mixed 3.3V/5V systems for exactly this purpose.

How should the thermal pad on the RGY package of SN74LVC157ARGYRG4 be handled?

The exposed thermal pad on the SN74LVC157ARGYRG4 RGY package (pin 17) must be soldered to a PCB copper pour connected to GND for optimal thermal performance. TI specifies that connecting it to GND reduces θJA from 87.1°C/W to lower effective values and improves reliability under sustained load. Leaving it floating degrades thermal dissipation and is not recommended. No signal or supply other than GND should be connected to the pad.

Is SN74LVC157ARGYRG4 pin-compatible with other packages in the SN74LVC157A family?

Yes - the SN74LVC157ARGYRG4 shares identical pin numbering and function mapping with all other SN74LVC157A variants (e.g., D, DB, PW, NS packages), per TI's Pin Configuration and Functions documentation. All 16-pin versions implement the same logic diagram, truth table, and electrical behavior. However, mechanical dimensions, thermal resistance, and moisture sensitivity differ - the SN74LVC157ARGYRG4 uses VQFN (RGY) with MSL Level-2, unlike SOIC (D) which is MSL Level-1.

What happens to outputs when the G (strobe) pin is high?

When the G pin of the SN74LVC157ARGYRG4 is driven high, all four Y outputs (1Y–4Y) are forced low, regardless of the states of A/B, 1A–4A, or 1B–4B inputs. This active-low strobe provides synchronous disable capability for bus isolation or power sequencing. The SN74LVC157ARGYRG4 does not enter high-impedance (tri-state) mode - outputs are actively driven low, ensuring defined logic levels during disable.