Nexperia USA Inc. 74HCT251PW-Q100J

Overview

74HCT251PW-Q100 from Nexperia is an automotive-grade 8-input, 3-state multiplexer with TTL-compatible inputs, complementary Y/Y outputs, active-low output enable (OE), and operation across -40 °C to +125 °C. It selects one of eight data inputs (I0–I7) using three binary select lines (S0–S2) and routes it non-invertingly to Y while asserting the inverse on Y. Used in automotive body control modules for signal routing between sensors and microcontrollers.

For engineers reviewing the 74HCT251PW-Q100 datasheet, 74HCT251PW-Q100 pinout, 74HCT251PW-Q100 application, or 74HCT251PW-Q100 equivalent, this page delivers verified functional behavior, AEC-Q100 Grade 1 qualification status, TTL-level input thresholds, propagation delay at 4.5 V/50 pF, and TSSOP16 package thermal derating details - all critical for automotive signal selection design.

Technical Context

The device implements a standard 8:1 multiplexer logic function with fully buffered, non-inverting data path and complementary outputs. Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure direct interfacing with legacy 5 V microcontrollers and logic families without level translation.

Output enable (OE) controls high-impedance tri-state operation on both Y and Y simultaneously, supporting bus-sharing architectures. The internal structure includes input clamp diodes enabling safe interface to voltages exceeding VCC when used with current-limiting resistors.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, 4.4 mm body width, 0.65 mm pitch, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8:1 multiplexer applications.

Compared with 74HC251PW-Q100, the 74HCT251PW-Q100 provides guaranteed TTL input compatibility essential for legacy 5 V designs, while SN74LV251APWREP trades automotive qualification for broader voltage range and lower quiescent current - making each suitable for distinct compliance and interface constraints.

Availability

74HCT251PW-Q100 is available at Aetrix Electronics and suitable for automotive body control, engine management, advanced lighting, and electric power steering applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.

Supply support for 74HCT251PW-Q100 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 global semiconductor expert delivering high-performance, reliable logic, discrete, and MOSFET solutions optimized for automotive, industrial, and consumer applications.

This device belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for signal routing, level translation, and bus management in harsh-environment electronic control units.

FAQ

Can 74HCT251PW-Q100 operate at 3.3 V supply?

No. The 74HCT251PW-Q100 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions table. At 3.3 V, input thresholds (VIH ≥ 2.0 V) may not be reliably met, and output drive strength degrades significantly. Use 74LVC251 or 74LV251 for 3.3 V systems.

What is the maximum clock frequency supported for select line toggling?

The device has no internal clock; select lines (S0–S2) are asynchronous. Maximum toggle rate is limited by propagation delay and transition time: tpd = 53 ns max, tt = 22 ns max at VCC = 4.5 V/CL = 50 pF, supporting reliable switching up to ~8 MHz in worst-case timing paths with setup/hold margin.

Does Y and Y switch simultaneously during input selection changes?

Yes. Both outputs update within the same propagation delay window (tpd), with typical skew <1 ns. The functional diagram and timing waveforms confirm synchronous assertion of Y and Y - critical for applications relying on complementary output integrity during dynamic reconfiguration.

Is there internal ESD protection on the Y and Y outputs?

Yes. All pins - including Y and Y - feature HBM > 2000 V and CDM > 1000 V ESD protection per JEDEC JS-001/JS-002. This is confirmed in Section 2 features and Table 9 test conditions, ensuring robustness against handling and board-level transients in automotive assembly environments.