Download LF347 - Slot Tech Forum

Part Number
LF147
LF247
LF347
LF347
LF347J
LF347J-SMD
LF347M
LF347BN
LF347N
LF347 for higher reliability applications (Military and Aerospace grade)
LF347, industrial grade device.
Consumer grade device.
Quad Wide Bandwidth Op Amp, JFET, LM324 / LM348 pinout (NSC)
LF347 in a ceramic DIP
LF347 in a ceramic surface mount case
LF347 in a SOIC case
LF347 in a ? case
LF347 in a plastic DIP case
LF147 is a high-grade device. It is specified to be able to run at higher supply
voltages, consume less power, lower noise, and generally improved characteristics over
the LF347 devices.
The chip is tested in the die form (before it goes into a case). Those with superior
characteristics are put in ceramic cases and labeled as LF147J. The “better than average,
but not superior” devices end up labeled “LF247”. Those that meet specs end up labeled
“LF347”. Those that don’t meet specs are usually destroyed, or sold off by the pound to
unknown people. Parts that don’t measure up to specs usually never get the part number
stamped on them. Beware of buying IC that do not have proper stampings.
The LF347 is a bipolar FET input op amp that comes four to a package. They
have the same pin out as the LM324, and has all-around better specs than the LM324.
LF147J
LF347N
Supply voltage
+ and – 22 V (max) + and – 18 V (max)
Differential input voltage
+ and – 38 V (max) + and – 30 V (max)
Input voltage range
+ and – 19 V (max) + and – 15 V (max)
Power dissipation
900 mW
1000 mW
Input offset voltage
1 mV (typ)
5 mV (typ)
Input offset current
25 pA (typ)
25 pA (typ)
Input bias current
50 pA (typ)
50 pA (typ)
Input resistance
1012 Ohms
1012 Ohms
Large signal voltage gain
100 V / mV
25 V / mV
(at + and – 15 V power, + and – 10 V out, Load resistance of 2K Ohms)
Output voltage swing
+ to – 13.5 V
+ to – 13.5 V
(at + and – 15 V power. Load resistance of 10K Ohms)
Input CMRR
100 dB (typ)
100 dB (typ)
PSRR
100 dB (typ)
100 dB (typ)
Input common mode voltage range -12 to +15 V
-12 to +15 V
Supply current
7.2 mA (typ)
7.2 mA (typ)
Slew rate
13 V / s
13 V / s
Gain – Bandwidth product
4 MHz (typ)
4 MHz (typ)
Input noise voltage
20 nV / sq rt Hz
20 nV / sq rt Hz
Input noise current
0.01 pA / sq rt Hz
0.01 pA / sq rt Hz
Harmonic distortion
<0.02%
<0.02%
(At V gain = 10, Loar R = 10K Ohm, V out = 20 V P-P, BW = 20 Hz to 20 KHz)