LM158-N, LM258-N, LM2904-N, LM358-N

SNOSBT3I – JANUARY 2000 – REVISED DECEMBER 2014

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9 Power Supply Recommendations

For proper operation, the power supplies must be properly decoupled. For decoupling the supply pins it is

suggested that 10 nF capacitors be placed as close as possible to the op-amp power supply pins. For single

supply, place a capacitor between V+ and V

−supply leads. For dual supplies, place one capacitor between

V+ and ground, and one capacitor between V- and ground.

Precautions should be taken to insure that the power supply for the integrated circuit never becomes

reversed in polarity or that the unit is not inadvertently installed backwards in a test socket as an unlimited

current surge through the resulting forward diode within the IC could cause fusing of the internal conductors

and result in a destroyed unit.

10 Layout

10.1 Layout Guidelines

For single-ended supply configurations, the V+ pin should be bypassed to ground with a low ESR capacitor. The

optimum placement is closest to the V+ pin. Care should be taken to minimize the loop area formed by the

bypass capacitor connection between V+ and ground. The ground pin should be connected to the PCB ground

plane at the pin of the device. The feedback components should be placed as close to the device as possible to

minimize stray parasitics.

For dual supply configurations, both the V+ pin and V- pin should be bypassed to ground with a low ESR

capacitor. The optimum placement is closest to the corresponding supply pin. Care should be taken to minimize

the loop area formed by the bypass capacitor connection between V+ or V- and ground. The feedback

components should be placed as close to the device as possible to minimize stray parasitics.

For both configurations, as ground plane underneath the device is recommended.

10.2 Layout Example

Figure 45. Layout Example

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