Texas Instruments SN74LVC157APWRG4

Overview

SN74LVC157APWRG4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer IC operating from 1.65V to 3.6V, featuring 16-pin TSSOP package, 5.2ns max propagation delay at 3.3V, 5.5V-tolerant inputs, and –40°C to 125°C industrial temperature range. It enables channel selection in digital logic routing for bus management and signal path control.

For engineers reviewing the SN74LVC157APWRG4 datasheet, SN74LVC157APWRG4 pinout, SN74LVC157APWRG4 application, or SN74LVC157APWRG4 equivalent, key selection criteria include input voltage tolerance (up to 5.5V), output drive capability (±24mA at 3V), low-power CMOS operation, and compatibility with mixed-voltage 3.3V/5V system interfacing.

Technical Context

The SN74LVC157APWRG4 implements four independent 2:1 multiplexers with a shared active-low strobe (G) and common address select (A/B) input. Each channel routes either input A or B to its corresponding output Y based on A/B state when G is low; all outputs go low when G is high.

Its LVC-family design ensures TTL-compatible thresholds across 1.65–3.6V VCC, supports hot-swap capable inputs, and delivers rail-to-rail output swing. The device exhibits low ground bounce (<0.8V) and undershoot (>2V) at 3.3V, with latch-up immunity exceeding 250mA per JESD17.

Key Specifications

Pinout & Package

Packaged in a 16-pin TSSOP (PW) with 5.00 mm × 6.4 mm body size and 0.65 mm lead pitch, SN74LVC157APWRG4 uses standard surface-mount footprint compatible with automated reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC157APWR and 74LVC157ADTR2G, SN74LVC157APWRG4 offers full –40°C to 125°C qualification, consistent NIPDAU finish, and guaranteed 5.2ns max tpd - making it the preferred choice for automotive and harsh-environment designs requiring assured performance margins.

Availability

SN74LVC157APWRG4 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and communications infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVC157APWRG4 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, embedded processing, and connectivity technologies with over 90 years of innovation in high-reliability components.

SN74LVC157APWRG4 belongs to TI's LVC logic family, engineered for low-voltage, high-speed digital interfacing in mixed-signal systems where voltage translation, noise immunity, and thermal robustness are critical.

FAQ

What is the maximum clock/data rate supported by SN74LVC157APWRG4?

The SN74LVC157APWRG4 is not a clocked device but a combinational multiplexer. Its usable data rate depends on propagation delay and system setup/hold timing. With 5.2ns max tpd at 3.3V, it supports clean signal routing up to approximately 190MHz toggle frequency in well-designed PCB layouts with controlled impedance and proper termination.

Can SN74LVC157APWRG4 interface directly with 5V microcontrollers?

Yes, SN74LVC157APWRG4 accepts input voltages up to 5.5V regardless of VCC level (1.65–3.6V), allowing direct connection to 5V GPIOs. Outputs swing rail-to-rail (0V to VCC), so level-shifting is needed only if the receiving device requires 5V logic levels - which SN74LVC157APWRG4 does not provide.

Does SN74LVC157APWRG4 require external pull-up or pull-down resistors on unused inputs?

Yes. Per TI's SCBA004 guidance, all unused inputs of SN74LVC157APWRG4 must be tied to VCC or GND to prevent floating states that cause increased ICC, noise coupling, or undefined outputs. Leaving inputs unconnected risks erratic behavior and elevated power consumption.

What is the thermal resistance (RθJA) of SN74LVC157APWRG4 in its TSSOP package?

The SN74LVC157APWRG4 in the PW (TSSOP-16) package has a junction-to-ambient thermal resistance (RθJA) of 141.8°C/W, as specified in TI's SCAS292S datasheet revision December 2024. This value assumes standard JEDEC 2-layer board conditions; actual performance improves with PCB copper area and thermal vias.

Is SN74LVC157APWRG4 pin-compatible with older 74LS157 or 74HC157 devices?

No. While functionally equivalent as a quad 2:1 multiplexer, SN74LVC157APWRG4 uses a different pinout than 74LS157 (16-pin PDIP) and 74HC157 (16-pin SOIC). Specifically, G (strobe) is on pin 1 and A/B (select) on pin 15 in SN74LVC157APWRG4, whereas 74HC157 places G on pin 15 and A/B on pin 1 - requiring PCB layout changes for replacement.