LF257

If Military/Aerospace specified devices are required, contact the National Semiconductor Sales Office/Distributors for
availability and specifications.
                                                   LF155/6              LF256/7/LF356B             LF355/6/7
Supply Voltage                               ±22V                              ±22V                    ±18V
Differential Input Voltage               ±40V                               ±40V                    ±30V
Input Voltage Range (Note 2)        ±20V                               ±20V                    ±16V
Output Short Circuit Duration Continuous                      Continuous           Continuous
TJMAX
H-Package                                       150˚C                               115˚C                    115˚C
N-Package                                                                               100˚C                    100˚C
M-Package                                                                               100˚C                    100˚C
Power Dissipation at T_A = 25˚C (Notes
1, 8)
H-Package (Still Air)                       560 mW                          400 mW                400 mW
H-Package (400 LF/Min Air Flow)  1200 mW                        1000 mW              1000 mW
N-Package                                                                             670 mW                670 mW
M-Package                                                                             380 mW                380 mW
Thermal Resistance (Typical) JA
H-Package (Still Air)                       160˚C/W                          160˚C/W                160˚C/W
H-Package (400 LF/Min Air Flow)     65˚C/W                            65˚C/W                  65˚C/W
N-Package                                                                             130˚C/W                130˚C/W
M-Package                                                                             195˚C/W                195˚C/W
(Typical) JC
H-Package                                      23˚C/W                              23˚C/W                  23˚C/W
Storage Temperature Range −65˚C to +150˚C           −65˚C to +150˚C    −65˚C to +150˚C
Soldering Information (Lead Temp.)
Metal Can Package
Soldering (10 sec.)                            300˚C                                 300˚C                    300˚C
Dual-In-Line Package
Soldering (10 sec.)                            260˚C                                 260˚C                     260˚C
Small Outline Package
Vapor Phase (60 sec.)                                                                 215˚C                     215˚C
Infrared (15 sec.)                                                                        220˚C                      220˚C
See AN-450 "Surface Mounting Methods and Their Effect on Product Reliability" for other methods of
soldering surface mount devices.
ESD tolerance
(100 pF discharged through 1.5kΩ)  1000V                                1000V                      1000V

These are the first monolithic JFET LF257 input operational ampli- fiers to incorporate well matched, high voltage JFETs on the same chip with standard bipolar transistors (BI-FET™ Tech- nology). These LF257 feature low input bias and offset currents/low offset voltage and offset voltage drift, coupled with offset adjust which does not degrade drift or common-mode rejection. The LF257 are also designed for high slew rate, wide bandwidth, extremely fast settling time,low voltage and current noise and a low 1/f noise corner.