Nexperia USA Inc. 74HC27D,653

Overview

74HC27D,653 from Nexperia is a triple 3-input NOR gate in SO14 (SOT108-1) package, operating from 2.0 V to 6.0 V supply, with propagation delay as low as 8 ns at VCC = 6.0 V and CL = 15 pF, CMOS-level input compatibility, and guaranteed operation from −40 °C to +125 °C. It serves as a combinational logic building block in digital control, address decoding, and enable/disable signal conditioning circuits.

For engineers reviewing the 74HC27D,653 datasheet, 74HC27D,653 pinout, 74HC27D,653 application, or 74HC27D,653 equivalent, key selection criteria include supply voltage range (2.0–6.0 V), propagation delay vs. VCC/CL, input threshold compatibility (CMOS), thermal rating (−40 °C to +125 °C), and SO14 package mechanical footprint for PCB layout and reflow compatibility.

Technical Context

The 74HC27D,653 implements three independent 3-input NOR gates using standard CMOS silicon technology, with input clamp diodes enabling safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Each gate exhibits symmetrical HIGH/LOW output drive capability (±4.0 mA at VCC = 4.5 V).

Its logic function follows strict Boolean NOR behavior: output is HIGH only when all three inputs are LOW; otherwise, output is LOW. Input thresholds scale with VCC (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC), ensuring robust noise immunity across the full supply range.

Key Specifications

Pinout & Package

74HC27D,653 uses the SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple 3-input NOR gate applications.

Compared with 74HC27D,653, the 74HCT27D,653 offers superior TTL input compatibility at the cost of marginally higher static current, while SN74HC27DR provides identical performance with alternate supply-chain assurance - both retain pin-for-pin and function-for-function equivalence in SO14 layout.

Availability

74HC27D,653 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, consumer appliance logic modules, and medical diagnostic interface boards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC27D,653 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 efficiency, miniaturization, and robustness in high-volume applications.

The 74HC27D,653 belongs to Nexperia's 74HC high-speed CMOS logic family, designed for low-power, wide-supply digital interfacing and combinatorial logic in industrial, automotive, and consumer systems where reliability and thermal resilience are critical.

FAQ

Can 74HC27D,653 operate reliably at 2.0 V supply?

Yes. The device is fully specified down to 2.0 V supply, with guaranteed VIH ≥ 1.5 V and VIL ≤ 0.5 V at that voltage, and propagation delay ≤ 90 ns (max) under recommended conditions. This makes it suitable for battery-powered or low-voltage microcontroller peripheral logic where headroom is constrained.

What is the maximum capacitive load the outputs can drive?

The outputs are characterized up to 50 pF load capacitance in dynamic testing (Table 9), with tpd and tt values provided for CL = 15 pF and CL = 50 pF. For stable operation beyond 50 pF, external buffer stages or slew-rate limiting may be required to maintain timing integrity and avoid ringing.

Is the SO14 package of 74HC27D,653 compatible with standard reflow profiles?

Yes. The SOT108-1 package is rated for standard lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260 °C. Its gull-wing leads and 1.27 mm pitch support automated optical inspection and high-yield placement on standard SMT lines.

Does 74HC27D,653 require external pull-up or pull-down resistors on unused inputs?

Yes. Unused inputs must be terminated to VCC or GND to prevent floating states that cause increased ICC, erratic output behavior, and potential EMI. CMOS inputs have high impedance; leaving them unconnected risks oscillation and excessive power consumption due to noise coupling.