5秒后页面跳转
SMAJ30A-GT3 PDF预览

SMAJ30A-GT3

更新时间: 2024-11-15 10:25:11
品牌 Logo 应用领域
SENSITRON /
页数 文件大小 规格书
5页 293K
描述
Trans Voltage Suppressor Diode, 400W, 30V V(RWM), Unidirectional, 1 Element, Silicon, DO-214AC, LEAD FREE, PLASTIC, SMA, 2 PIN

SMAJ30A-GT3 数据手册

 浏览型号SMAJ30A-GT3的Datasheet PDF文件第2页浏览型号SMAJ30A-GT3的Datasheet PDF文件第3页浏览型号SMAJ30A-GT3的Datasheet PDF文件第4页浏览型号SMAJ30A-GT3的Datasheet PDF文件第5页 
ꢀꢁꢂꢀꢃꢄꢅꢆꢂ  
ꢀꢁꢂꢃꢄꢀꢅꢆꢇꢅꢀꢄ ꢄ  
ꢀꢁꢁꢂꢃꢄꢅꢆꢇꢈꢉꢊꢃꢋꢌꢅꢍꢎꢃꢎꢆꢈꢍꢄꢏꢊꢍꢎꢃꢐꢌꢑꢎꢈꢒꢊꢃꢄꢅꢓꢓꢆꢊꢄꢄꢌꢆꢄꢃ  
ꢀꢁꢇꢃꢈꢆꢂꢉꢊꢈꢄꢆꢅꢋ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢀꢁꢂꢁꢃꢄꢅꢆꢆꢂꢃꢇꢈꢉꢇꢃꢊꢆꢋꢌC  
ꢍꢆꢁꢂꢎꢏꢆꢐꢃ  
!" ꢀꢁꢂꢃꢃꢄꢅꢂꢃꢃꢆꢇꢂꢈꢉꢊꢄꢋꢆꢉꢄꢌꢍꢎꢃꢈꢏꢐꢑꢈꢆꢍꢎꢄ                            
!"ꢀ ꢀ ꢀ ꢀꢃꢆꢗꢂꢈꢆꢍꢎꢄ                            
!" ꢘꢙꢓꢚꢄꢛꢄꢜꢝꢓꢚꢄ ꢈꢂꢎꢊꢍ!!ꢄꢚꢍꢁꢈꢂ"ꢉꢄ                                                                    
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
B
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
!" #ꢎꢆ$ꢄꢂꢎꢊꢄꢞꢆ$ꢋꢆꢏꢉꢑꢈꢆꢍꢎꢂꢁꢄꢚꢉꢏꢃꢆꢍꢎꢃꢄ%ꢇꢂꢆꢁꢂ&ꢁꢉꢄ                                           
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
D
!" '(ꢑꢉꢁꢁꢉꢎꢈꢄꢌꢁꢂ)ꢗꢆꢎ"ꢄꢌꢂꢗꢂ&ꢆꢁꢆꢈ*ꢄ                  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
A
!" +ꢂꢃꢈꢄ,ꢉꢃꢗꢍꢎꢃꢉꢄ-ꢆ)ꢉꢄ                                 ꢀ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
F
!" ꢅꢁꢂꢃꢈꢆꢑꢄꢌꢂꢃꢉꢄ.ꢂꢈꢉꢏꢆꢂꢁꢄ/ꢂꢃꢄ#0ꢄ+ꢁꢂ))ꢂ&ꢆꢁꢆꢈ*ꢀ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢌꢁꢂꢃꢃꢆ!ꢆꢑꢂꢈꢆꢍꢎꢄ,ꢂꢈꢆꢎ"ꢄ1ꢒꢚ$2ꢄ                   ꢀ  
G
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
C
H
!" $ꢁꢀꢂꢃꢄꢅꢆꢇꢈ%ꢃꢉꢀꢊꢈꢋꢃꢀ&ꢀ'224235ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
E
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
SMA/DO-214AC  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢑꢆꢒꢅꢁꢓꢔꢒꢁꢕꢃꢀꢁꢂꢁꢃ ꢃ ꢃ ꢃ ꢃ ꢃ  
Dim Min Max Min  
Max  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
!" ꢌꢂꢃꢉ4ꢄ5'ꢋ'ꢌꢄꢋ2$6ꢜꢒ%ꢌꢄ0ꢍꢖꢄꢅꢏꢍ!ꢆꢁꢉꢄ.ꢍꢁꢊꢉꢊꢄꢅꢁꢂꢃꢈꢆꢑꢄ  
A
B
C
D
E
F
2.50 2.90 0.098 0.114  
4.00 4.60 0.157 0.181  
1.40 1.60 0.055 0.063  
0.152 0.305 0.006 0.012  
4.80 5.28 0.189 0.208  
2.00 2.44 0.079 0.096  
0.051 0.203 0.002 0.008  
0.76 1.52 0.030 0.060  
ꢀ ꢀ ꢀ  
!" -ꢏ)ꢆꢎꢂꢁꢃ4ꢄ ꢍꢁꢊꢉꢏꢄꢅꢁꢂꢈꢉꢊ7ꢄ ꢍꢁꢊꢉꢏꢂ&ꢁꢉꢄ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢗꢉꢏꢄ.80$ -ꢋ$ꢝꢘꢓ7ꢄ.ꢉꢈ/ꢍꢊꢄ6ꢓ69ꢄ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
!" ꢅꢍꢁꢂꢏꢆꢈ*4ꢄꢌꢂꢈ/ꢍꢊꢉꢄꢞꢂꢎꢊꢄꢍꢏꢄꢌꢂꢈ/ꢍꢊꢉꢄ:ꢍꢈꢑ/ꢄ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
!" .ꢂꢏꢕꢆꢎ"4ꢄ   
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
#ꢎꢆꢊꢆꢏꢉꢑꢈꢆꢍꢎꢂꢁꢄꢛꢄꢋꢉꢇꢆꢑꢉꢄꢌꢍꢊꢉꢄꢂꢎꢊꢄꢌꢂꢈ/ꢍꢊꢉꢄꢞꢂꢎꢊꢄ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢞꢆꢊꢆꢏꢉꢑꢈꢆꢍꢎꢂꢁꢄꢛꢄꢋꢉꢇꢆꢑꢉꢄꢌꢍꢊꢉꢄ2ꢎꢁ*ꢄ  
G
H
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
!" ꢔꢉꢆ"/ꢈ4ꢄꢓꢙꢓ9ꢒꢄ"ꢏꢂ)ꢃꢄ;ꢂꢗꢗꢏꢍ(ꢙ<  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
In mm  
In inch  
   ꢚꢛꢜꢄꢀꢝꢊꢊꢖꢞꢄ ꢔꢓꢖ!ꢕ"ꢍꢔꢓꢄ#ꢖ$%ꢖꢗꢔꢘꢍꢖꢉꢕ"&ꢄ ꢔ'ꢖꢘꢔꢓꢄ  
   ꢚꢂꢜꢄꢀꢝꢊꢊꢖꢞꢄ ꢔꢓꢖ!ꢕ"ꢍꢔꢓꢄ()ꢄ*&ꢔꢗ"ꢕꢘꢔꢄ ꢔ'ꢖꢘꢔꢓꢄ  
   +ꢉꢄꢀꢝꢊꢊꢖꢞꢄ ꢔꢓꢖ!ꢕ"ꢍꢔꢓꢄꢈ,)ꢄ*&ꢔꢗ"ꢕꢘꢔꢄ ꢔ'ꢖꢘꢔꢓꢄ  
ꢑꢁꢖꢔꢗꢎꢗꢃꢊꢁꢂꢔꢓꢘꢐꢃꢁꢓꢙꢃꢚꢕꢆꢒꢂꢏꢔꢒꢁꢕꢃꢛꢅꢁꢏꢁꢒꢂꢆꢏꢔꢐꢂꢔꢒꢐ-*./(0ꢛꢄꢝꢕ&ꢔꢓꢓꢄꢉꢍꢌꢔꢗꢑꢖꢓꢔꢄꢓꢎꢔꢘꢖꢊꢖꢔ%ꢄ  
ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ ꢀ  
ꢀꢁꢂꢃꢂꢄꢅꢆꢃꢇꢈꢅꢇꢄꢉ  
ꢊꢋꢌꢍꢎꢏꢉ  
1ꢁꢁꢂ  
ꢐꢂꢏꢑꢆꢉ  
400  
ꢒꢓꢇꢅꢉ  
7ꢄ  
ꢂꢄ  
 1ꢔ"2ꢄ1ꢝ&ꢓꢔꢄ1ꢉꢑꢔꢗꢄ ꢖꢓꢓꢖꢎ"ꢍꢖꢉꢕꢄ"ꢍꢄ*ꢄ.ꢄ/(0ꢛꢄ3+ꢉꢍꢔꢄꢈ4ꢄ/4ꢄ(5ꢄ6ꢖ!ꢝꢗꢔꢄꢈꢄ  
 1ꢔ"2ꢄ6ꢉꢗꢑ"ꢗ%ꢄꢀꢝꢗ!ꢔꢄꢛꢝꢗꢗꢔꢕꢍꢄꢎꢔꢗꢄ6ꢖ!ꢝꢗꢔꢄ(ꢄ3+ꢉꢍꢔꢄ85ꢄ  
 1ꢔ"2ꢄ1ꢝ&ꢓꢔꢄꢛꢝꢗꢗꢔꢕꢍꢄꢉꢕꢄꢈ,ꢐꢈ,,,9ꢀꢄ7"'ꢔꢊꢉꢗꢙꢄ3+ꢉꢍꢔꢄꢈ5ꢄ6ꢖ!ꢝꢗꢔꢄ/ꢄ  
 ꢀꢍꢔ"%;ꢄꢀꢍ"ꢍꢔꢄ1ꢉꢑꢔꢗꢄ ꢖꢓꢓꢖꢎ"ꢍꢖꢉꢕꢄ3+ꢉꢍꢔꢄꢋ5ꢄ  
 <ꢎꢔꢗ"ꢍꢖꢕ!ꢄ"ꢕ%ꢄꢀꢍꢉꢗ"!ꢔꢄ*ꢙꢎꢔꢗ"ꢍꢝꢗꢔꢄꢆ"ꢕ!ꢔꢄ  
ꢃꢄꢂ  
ꢋ,ꢄ  
ꢁꢁꢂ  
ꢀꢔꢔꢄ*":&ꢔꢄꢈꢄ  
ꢈꢒ,ꢄ  
ꢂꢄ  
1ꢂꢅꢀꢆꢇ  
*4ꢄ*ꢄꢉꢊ  
7ꢄ  
0ꢛꢄ  
$((ꢄꢍꢉꢄ=ꢈ(,ꢄ  
+ꢉꢍꢔꢏꢄ ꢈꢒꢄ+ꢉꢕ$ꢗꢔꢎꢔꢍꢖꢍꢖ'ꢔꢄꢘꢝꢗꢗꢔꢕꢍꢄꢎꢝ&ꢓꢔ4ꢄꢎꢔꢗꢄ6ꢖ!ꢝꢗꢔꢄ8ꢄ"ꢕ%ꢄ%ꢔꢗ"ꢍꢔ%ꢄ":ꢉ'ꢔꢄ*ꢄ.ꢄ/(0ꢛꢄꢎꢔꢗꢄ6ꢖ!ꢝꢗꢔꢄ/ꢄ  
/ꢒꢄꢁꢉꢝꢕꢍꢔ%ꢄꢉꢕꢄ(ꢒ,ꢙꢙꢘꢉꢎꢎꢔꢗꢄꢎ"%ꢓꢄꢍꢉꢄꢔ"ꢘꢌꢄꢍꢔꢗꢙꢖꢕ"&ꢄ   
8ꢒꢄ>ꢒ8ꢙꢓꢄꢓꢖꢕ!&ꢔꢄꢌ"&ꢊꢄꢓꢖꢕꢔ$ꢑ"'ꢔꢄ%ꢝꢍ;ꢄꢘ;ꢘ&ꢔꢄ.ꢄꢋꢄꢎꢝ&ꢓꢔꢓꢄꢎꢔꢗꢄꢙꢖꢕꢝꢍꢔꢓꢄꢙ"ꢞꢖꢙꢝꢙꢄ  
ꢋꢒꢄ?ꢔ"%ꢄꢍꢔꢙꢎꢔꢗ"ꢍꢝꢗꢔꢄ"ꢍꢄ@(0ꢛꢄ.ꢄ*  
(ꢒꢄ1ꢔ"2ꢄꢎꢝ&ꢓꢔꢄꢎꢉꢑꢔꢗꢄꢑ"'ꢔꢊꢉꢗꢙꢄꢖꢓꢄꢈ,ꢐꢈ,,,9ꢀꢍ  
ꢀꢁꢂꢃꢄꢀꢅꢆꢇꢅꢀꢄ                                             ꢈꢄꢉꢊꢄꢋꢄ                                     ꢌꢍꢍꢎꢏꢐꢐꢑꢑꢑꢒꢓꢔꢕꢓꢖꢍꢗꢉꢕꢒꢘꢉꢙꢄ  

与SMAJ30A-GT3相关器件

型号 品牌 获取价格 描述 数据表
SMAJ30AHE3 MCC

获取价格

Tape: 5K/Reel, 80K/Ctn;
SMAJ30AHE3/5A VISHAY

获取价格

TVS DIODE 30V 48.4V DO214AC
SMAJ30AHE3/61 VISHAY

获取价格

TVS DIODE 30V 48.4V DO214AC
SMAJ30AHM3/I VISHAY

获取价格

Trans Voltage Suppressor Diode,
SMAJ30A-HP6AT YAGEO

获取价格

瞬态抑制二极管 (车用)
SMAJ30A-M3/61 VISHAY

获取价格

TVS DIODE 30V 48.4V DO214AC
SMAJ30AQ MCC

获取价格

Tape: 5K/Reel, 80K/Ctn;
SMAJ30AQ DIODES

获取价格

400W Surface Mount Transient Voltage Suppressor
SMAJ30AQ YANGJIE

获取价格

SMA
SMAJ30A-Q BOURNS

获取价格

TVS DIODE 30V 48.4V SMA