Expected Life time

The lifetime of our audible components depends on many different factors and is impossible to determine exactly. We therefore publish the expected minimum lifetime measured under specific circumstances and environmental conditions.

If customers need lifetime expectations under other circumstance, we request them to ask for our instructions before performing their own lifetime tests in order to save time and exclude wrong conclusions.

Claims will only be examined and taken into account on condition that guidelines and instructions below have been strictly applied.

WORKING VOLTAGE OR DRIVE SIGNAL VERSUS EXPECTED LIFE TIME

The relationship between working voltage and expected life time is one of the prime factors on which life time depends. The curve follows an asymptotic function, strongly depending on tolerance elements published by the suppliers of several basic materials and working environmental conditions.

THE EXPECTED LIFE TIME OF OUR DIFFERENT SERIES IS DEFINED AS FOLLOWS

T ambient : 21°C; humidity : 40%; free air.

Voltage : see below.

STANDARD SERIES :

Mounted on panel
Working @ 12 Vdc in continuous use
Life expectations : minimum 2000 hours
The SXL515C, SXLI515C1, SXLW515C and SXLP515C series have a minimum life time of 9 hours

SMA SERIES :

Mounted on PCB
Working @ 12 Vdc in continuous use; L-version working @ 6 Vdc
Life expectations : minimum 100 hours
The SMA-21LV (pin/SMD) working @ 3 Vdc in continuous use : minimum 24 hours
All tests ar made @ 20°C

SMAT SERIES :

Mounted on PCB
Working @ 12 Vpp in continuous use at resonance frequency, tested on maximum sound pressure (e.g. SMAT-21 @ 3.75 kHz)
Life expectations : minimum 1000 hours

SMAC SERIES :

Mounted on PCB
Working @ 12 Vdc in continuous use
Life expectations : minimum 1000 hours

SAS SERIES :

Life time expectations at 12 Vdc :

SAS-2835 : minimum 2000 hours
SAS-2154 : minimum 2000 hours
SAS-87 : minimum 9 hours
SAS-325A-6 : minimum 40 minutes
SAS-81 : minimum 1 hour
SAS-RH72 and SAS-RL72 : minimum 24 hours