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Ideal Diodes
LTC4413 -
Two 2.6 A ideal diodes allow connecting battery and wall adapter to common load. 28 mV regulated forward voltage. Supply voltage range 2.5V to 5.5V. 3 mm x 3mm DFN  package.    http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1003,C1142,C1079,P7889
    

     

Switches for 8 Ohm and 32 Ohm speakers, Single Supply 1.8 V to 5V
      
MAX4626  - 0.5 OHm,     SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2161
MAX4627  - 0.5 OHm,     SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2161      
MAX4628  - 0.5 OHm,     SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2161
MAX4645  -    2 OHm,     SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2255
MAX4646  -    2 OHm,     SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2255
MAX4641  -    4 OHm,  2 SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2229
MAX4642  -    4 OHm,  2 SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2229
MAX4643  -    4 OHm,  2 SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2229
MAX4651  -    4 OHm,  4 SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2215
MAX4652  -    4 OHm,  4 SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2215
MAX4653  -    4 OHm,  4 SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2215
MAX4614  -  10 OHm,  4 SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2071
MAX4615  -  10 OHm,  4 SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2071
MAX4616  -  10 OHm,  4 SPST             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2071
MAX4624  -    1 OHm,     SPDT             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2116
MAX4625  -    1 OHm,     SPDT             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2116
MAX4644  -    4 OHm,     SPDT             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2245   
MAX4636  -    4 OHm,  2 SPDT             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2270
MAX4617  -  10 OHm,  8:1 Mux             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2064
MAX4618  -  10 OHm,  4:1 Mux Dual     http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2064
MAX4619  -  10 OHm,  3 SPDT             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2064
MAX4674  -    4 OHm,  4 SPDT             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2246
MAX4634  -    4 OHm,  4:1 Mux             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2254
MAX4638  -    4 OHm,  8:1 Mux             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2339
MAX4639  -    4 OHm,  4:1 Mux Dual     http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2339
MAX4617  -  10 OHm,  8:1 Mux             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2064
MAX4618  -  10 OHm,  4:1 Mux Dual     http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2064
MAX4619  -  10 OHm,  4 SPDT             http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2064

Switches for 8 Ohm and 32 Ohm speakers, Dual Supply +/-5V       
MAX4675  -    4 OHm,      SPST            http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2310
MAX4676  -    4 OHm,      SPST            http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2310
MAX4677  -    2 OHm,  4  SPST            http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2274
MAX4578  -    2 OHm,  4  SPST            http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2274
MAX4679  -    2 OHm,  4  SPST            http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2274
 
Switches for 1.8 V & 3V Operation 
MAX4715  -    1.2 & 0.4  OHm,  SPST  NO           http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2565   
MAX4716  -    1.2 & 0.4  OHm,  SPST  NC           http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2565       
MAX4741  -    4    & 0.8  OHm,  SPST  NO dual    http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=3045  
MAX4742  -    4    & 0.8  OHm,  SPST  NC dual    http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=3045
MAX4743  -    4    & 0.8  OHm,  SPST  NO, NC    http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=3045   
MAX4751  -    10  &    1  OHm,  SPST  NO, quad                 future product
MAX4752  -    10  &    1  OHm,   SPST  NC, quad                 future product   
MAX4753  -    10  &    1  OHm,   SPST  NO, NC quad          future product
MAX4714  -    2.5 & 0.8  OHm,  SPDT                  http://dbserv.maxim-ic.com/quick_view2.cfm?qv_pk=2564
MAX4736  -    10  &    1  OHm,  SPDT  dual                          future product
MAX4734  -    10  &    1  OHm,  4:1 Mux                               future product
   
FET & MOSFET

FDS6679   - 0.009 Ohm at 10Vgs,  25Vgs max, 13A, 2.5W, $0.85/10k  http://www.fairchildsemi.com/pf/FD/FDS6679.html