Aluminum-alloy clad sheet

An aluminum-alloy clad sheet to be formed into a heat exchanger by brazing, the aluminum-alloy clad sheet including at least a core aluminum alloy sheet and an aluminum-alloy sacrificial anti-corrosive material cladded with each other,

• wherein the aluminum-alloy clad sheet has an aluminum alloy composition containing, in percent by mass, 0.5 to 1.8% Mn, 0.4 to 1.5% Si, 0.05 to 1.2% Cu, and 0.03 to 0.3% Ti, containing Fe controlled to be 1.0% or less (including 0%), and containing one or more of 0.02 to 0.4% Cr, 0.02 to 0.4% Zr, and 0.02 to 0.4% Ni, with the remainder including Al and inevitable impurities, and
• the average number density of dispersed particles each having a circle-equivalent diameter of 0.5 μm or less is 10 to 25 per cubic micrometer, the dispersed particles being observed on a rolling plane in the central part in the thickness of the core aluminum alloy sheet, and
• among the dispersed particles each having the circle-equivalent diameter of 0.5 μm or less, Al—Mn—Si based dispersed particles have an average Mn/Si compositional ratio (in terms of percent by mass) of 2.50 or more, and
• among the Al—Mn—Si based dispersed particles each having the circle-equivalent diameter of 0.5 μm or less, Al—Mn—Si based dispersed particles each having a Mn/Si compositional ratio (in terms of percent by mass) of 2.50 or more have a volume fraction a, and Al—Mn—Si based dispersed particles each having a Mn/Si ratio (in terms of percent by mass) of less than 2.50 have a volume fraction b, and a ratio a/b is 0.50 or more.