ps2561- 1, - 2 are in a plastic dip ( dual in- line package) and ps2561l- 1, - 2 are lead bending type ( gull- wing) for. 4 are in a plastic dip ( dual in- line package) and ps2561l- 1, - 2 and - 4 are in a lead bending type ( gull- wing) for surface mount. safet