Features SPiKe Protection Low external component count Quiet fade-in/out mute mode Wide supply range: 20V - 70V Signal-to-Noise Ratio >= 93dB (ref. to PO = 1W) Description The LM4781 is a three channel audio amplifier capable of typically delivering 35W per channel of continuous average output power into an 8 load with less than 0.5% THD+N from 20Hz - 20kHz. The LM4781 is fully protected utilizing National's Self Peak Instantaneous Temperature (°Ke) (SPiKeTM) protection circuitry. SPiKe provides a dynamically optimized Safe Operating Area (SOA). SPiKe protection completely safeguards the LM4781's outputs against over-voltage, under-voltage, overloads, shorts to the supplies or GND, thermal runaway and instantaneous temperature peaks. The advanced protection features of the LM4781 places it in a class above discrete and hybrid amplifiers. Each amplifier of the LM4781 has an independent smooth transition fade-in/out mute. The LM4781 can easily be configured for bridge or parallel operation for higher power and bi-amp solutions. Key Specification Output Power/Channel with 0.5% THD+N, 1kHz into 8 35W (typ) THD+N at 3 x 20W into 8 (20Hz - 20kHz) 0.2% (typ) THD+N at 3 x 20W into 6 (20Hz - 20kHz) 0.3% (typ) THD+N at 3 x 20W into 4 (20Hz - 20kHz) 0.5% (typ) Mute Attenuation 110dB (typ) PSRR 85dB (min) Slew Rate 9V/µs (typ) Applications Audio amplifier for component stereo Audio amplifier for compact stereo Audio amplifier for self-powered speakers Audio amplifier for high-end and HD TVs

Typical Application click for larger image	Connection Diagram *click for larger image *click for larger image
Typical Performance *click for larger image

Datasheets

Title		Size	Date	Other Language
	LM4781 Overture Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute	1125 Kbytes	20-Aug-03

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4781TA/NOPB LM4781TA RoHS Status	TO-220	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 75 DIGI-KEY Worldwide 0 MOUSER Worldwide 117 TAYLOR Americas 75	$5.62 each at 1K+ pcs	rail of 15

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4781.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4781 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4781TA/NOPB LM4781TA	7411.708 7419.508	TO-220	27	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# L4781TA

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4781.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4781 is located at RoHS Status.

CAD Symbols and Models Download LM4781 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4781TA	HV700	0	14255	0	0	1582500	3	449038695

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4781.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4781 is located at RoHS Status.