Texas Instruments SN74AHC157PWR

Overview

SN74AHC157PWR from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in a 16-pin TSSOP package, operating from 2 V to 5.5 V supply, delivering true (non-inverted) 4-bit word routing with active-low strobe control, and supporting industrial temperature range (–40°C to 125°C) - used in digital logic bus selection and signal path arbitration.

For engineers reviewing the SN74AHC157PWR datasheet, SN74AHC157PWR pinout, SN74AHC157PWR application, or SN74AHC157PWR equivalent, key selection criteria include propagation delay (≤7.5 ns at 5 V), low static current (≤40 µA), ESD robustness (2000 V HBM), and compatibility with mixed-voltage 3.3 V/5 V system interfaces.

Technical Context

The SN74AHC157PWR implements four independent 2:1 multiplexers sharing a common active-low strobe (G) input: when G is high, all Y outputs are forced low; when G is low, the A/B select line determines whether inputs 1A–4A or 1B–4B are routed to outputs 1Y–4Y. Each channel provides true (non-inverting) output logic.

It uses advanced CMOS AHC technology for rail-to-rail output swing, low power consumption, and high noise immunity. Input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), enabling reliable interfacing across 2 V–5.5 V operation without level shifters.

Key Specifications

Pinout & Package

TSSOP-16 (PW) package: 5.00 mm × 6.4 mm body size, 0.65 mm lead pitch, thin profile (1.2 mm max height), surface-mount compatible with standard reflow profiles (MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV157APWR and 74LVC157APW,118, the SN74AHC157PWR delivers optimal balance of low ICC (≤40 µA), scalable input thresholds, and industrial temperature support - making it preferred for space-constrained, thermally demanding, or mixed-supply embedded control applications.

Availability

SN74AHC157PWR is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply with full RoHS compliance and MSL Level-1 reflow readiness.

Supply support for SN74AHC157PWR 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 logic solutions, with over 90 years of innovation in high-reliability IC design and manufacturing.

The SN74AHC157PWR belongs to TI's advanced high-speed CMOS (AHC) logic family, engineered for low-power, high-noise-immunity digital signal routing in industrial, automotive, and communications infrastructure applications.

FAQ

What is the maximum recommended operating frequency for SN74AHC157PWR in a 5 V system?

The SN74AHC157PWR does not specify a maximum clock frequency, but its propagation delay (tPLH/tPHL ≤7.5 ns at VCC = 5 V, CL = 15 pF) supports reliable operation up to approximately 100 MHz in well-terminated, low-capacitance signal paths. System-level timing must account for setup/hold margins and board-level parasitics - the SN74AHC157PWR itself remains functional within its specified 2 V–5.5 V supply and –40°C to 125°C temperature range.

Can SN74AHC157PWR safely interface between 3.3 V and 5 V logic domains?

Yes - the SN74AHC157PWR supports 2 V–5.5 V operation and features input thresholds that scale with VCC (VIH ≥0.7×VCC, VIL ≤0.3×VCC). When powered at 5 V, it reliably accepts 3.3 V logic-high inputs (3.3 V > 3.5 V threshold minimum is not required; actual VIH min = 3.5 V at VCC = 5 V per spec, so 3.3 V may be marginal - use level translation for guaranteed compatibility). For robust 3.3 V → 5 V interfacing, power SN74AHC157PWR at 3.3 V and drive outputs into 5 V-tolerant inputs.

Does SN74AHC157PWR have built-in ESD protection, and what levels are certified?

Yes - the SN74AHC157PWR includes on-chip ESD protection rated per JEDEC standards: ±2000 V Human-Body Model (HBM), ±200 V Machine Model (MM), and ±1000 V Charged-Device Model (CDM). These ratings meet typical industrial handling requirements and reduce the need for external TVS diodes on board-level signal lines, though layout best practices (short traces, ground shielding) remain essential for system-level robustness.

How does the strobe (G) pin function in SN74AHC157PWR, and what happens when it is high?

Pin 15 (G) is an active-low strobe: when G = HIGH, all four Y outputs (pins 4, 7, 9, 12) are forced LOW regardless of A/B select state or input values - effectively disabling the multiplexer outputs. This feature enables bus contention prevention and synchronized blanking in multi-device systems. When G = LOW, the device operates normally, routing selected inputs to outputs based on the A/B control signal. The SN74AHC157PWR guarantees this behavior across its full operating temperature and voltage range.

Is SN74AHC157PWR pin-compatible with other packages in the SN74AHC157 family?

Yes - the SN74AHC157PWR (TSSOP-16) shares identical pin configuration and function mapping with SN74AHC157DR (SOIC-16), SN74AHC157DBR (SSOP-16), and SN74AHC157DGVR (TVSOP-16), as confirmed in TI's Pin Functions table (Table 3-1) and Figure 3-1. All variants use the same 16-pin numbering scheme and logic assignment - allowing drop-in replacement across packages when board layout and thermal constraints permit.