LF256 datasheet(10/23 Pages) NSC

Part #	LF256

Description	JFET Input Operational Amplifiers

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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Detailed Schematic

00564613

*C = 3pF in LF357 series.

Connection Diagrams (Top Views)

Metal Can Package (H)

00564614

Order Number LF155H, LF156H, LF256H, LF257H,

LF356BH, LF356H, or LF357H

See NS Package Number H08C

*Available per JM38510/11401 or JM38510/11402

Dual-In-Line Package (M and N)

00564629

Order Number LF356M, LF356MX, LF355N, or LF356N

See NS Package Number M08A or N08E

Application Hints

These are op amps with JFET input devices. These JFETs

have large reverse breakdown voltages from gate to source

and drain eliminating the need for clamps across the inputs.

Therefore large differential input voltages can easily be ac-

commodated without a large increase in input current. The

maximum differential input voltage is independent of the

supply voltages. However, neither of the input voltages

should be allowed to exceed the negative supply as this will

cause large currents to flow which can result in a destroyed

unit.

Exceeding the negative common-mode limit on either input

will force the output to a high state, potentially causing a

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