NLAS54404FCTAG

Overview

The NLAS54404 is a single-supply, bidirectional dual SPDT analog switch designed for ultra-low distortion audio applications. It operates from a 3.0 V to 3.6 V DC supply and supports ground-referenced signals up to 2.0 VRMS (±2.828 VPEAK). Key electrical parameters include an ON-resistance of 2.1 Ω at 25°C, THD+N of -118 dB into a 20 kΩ load, and PSRR of 126 dB across the 20 Hz to 20 kHz range. The device features independent channel selects, a mute function, and a turn-on delay capability via an external capacitor on the CAP_SS pin. It is housed in a 12-ball WLCSP package measuring 1.6 mm x 1.2 mm.

Feature Summary

• Dual SPDT architecture with independent left and right channel selection controls
• Ultra-low total harmonic distortion plus noise performance suitable for high-fidelity audio
• Integrated mute functionality with configurable turn-on delay to minimize switching transients
• 1.8 V logic-compatible digital inputs for direct interface with low-voltage controllers

Applications

• Computer sound cards
• Home theater audio products
• SACD / DVD Audio systems
• DVD player audio output switching
• Headsets for MP3 / Cellphone switching

Procurement Notes

Verify the specific ordering suffix FCTAG corresponds to the 3000-unit tape and reel packaging configuration. Confirm that the component meets RoHS compliance standards and is free from lead, halogens, and brominated flame retardants as specified in the datasheet documentation.

Selection Notes

Select this component for designs requiring a 3.3 V single supply operation with bidirectional signal handling capabilities. Ensure the application utilizes ground-referenced signals within the ±2.828 VPEAK range. Verify that the 1.8 V logic levels are compatible with the controlling microprocessor or CPU interface requirements.

Part Context

This device belongs to the NLAS54404 series of ultra-low THD stereo SPDT switches manufactured by onsemi. It is specifically engineered to meet the stringent signal integrity requirements of consumer and professional audio engineers, offering superior isolation and flat frequency response compared to standard analog switches.

Replacement Considerations

Consult the official onsemi documentation for verified substitute part numbers. Cross-reference pin configurations and electrical characteristics carefully when considering alternative components to ensure compatibility with existing PCB layouts and signal paths.

FAQ

How is the turn-on delay time determined?

The turn-on delay is determined by the value of the ceramic chip capacitor connected to the CAP_SS pin, the speaker load impedance, and the DC level of the audio signal. For example, a 0.1 µF capacitor with a 32 Ω load results in approximately 1810 µs delay.

What is the maximum analog signal voltage the device can handle?

The NLAS54404 can accommodate ground-referenced analog signals up to 2.0 VRMS, which corresponds to ±2.828 VPEAK, while operating from a single 3.3 V DC supply.

Can the MUTE pin be left floating?

Yes, the MUTE pin has an internal pull-up resistor to the internal 3.3 V supply rail. It can be driven HIGH or tri-stated (floated) by the controller to activate the mute state.