Electret Condenser Microphone
Date:
4/27/05
Dimensions: mm (
IN)
Part Number:
25LM040
2
2.54
(.10)
1
2.31
(.091)
4.29 ±.101
(.169 ±.004)
.66 (.026)
5.99 ±.203
(.236 ±.008)
1.65
(.065)
ø9.60 ±.101
(ø.378 ±.004)
8.99 ±.304
(.354 ±.012)
Electret Condenser Microphone
1
IC
2
Shield Case
RL
+B
OUT
-B Ground
RL=1K
(300~5K)
+20
SPL (dB)
+10
0
-10
-20
20
50
100
200
500
1K 2K
Frequency (Hz)
5K
10K
KT-400028
Soldering Process:
Each condenser microphone contains a FET within its case.
Generally, semiconductors are easily weakened by over-
heating, over-charge of voltage.
Special caution is needed for proper soldering as follows:
1. Use 30W (or under) soldering iron and maintain
230°-260°C in operation.
2. Soldering should be accomplished within two seconds at
each terminal so as not to be overheated.
3. Do not make a cavity at the surface of lead on the pattern
plate. (A cavity may change the characteristics of the mic.)
Electrical Specifications:
•
Sensitivity (odb=1V/1µ bar 1 KHz): -61±3db
•
Output impedance: low
•
Frequency: 50Hz~13KHz
•
Range of operating voltage: 1.5V to 10V standard
voltage 4.5V
•
Current drain: ø.5mA max.
•
S/N ratio: 40db or more
•
Maximum input sound pressure: 120db SPL
Available from Mouser Electronics
www.mouser.com
(800) 346-6873
Specifications are subject to change without notice. No liability or warranty implied by this information. Environmental compliance based on producer documentation.