|
|
Varistors 220VDC 1W 7500A L/S=10mm Long LD
- ERZ-E14A221S1
- Panasonic Industry
-
1:
$0.99
-
1,905In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E14A221S1
End of Life
|
Panasonic Industry
|
Varistors 220VDC 1W 7500A L/S=10mm Long LD
|
|
1,905In Stock
|
|
|
$0.99
|
|
|
$0.713
|
|
|
$0.662
|
|
|
$0.609
|
|
|
View
|
|
|
$0.59
|
|
|
$0.573
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E-S1
|
MOVs
|
PCB Mount
|
Radial
|
|
140 VAC
|
180 VDC
|
220 V
|
360 V
|
16.5 mm
|
7.5 kA
|
155 J
|
1.2 nF
|
- 40 C
|
+ 125 C
|
|
Bulk
|
|
|
|
Varistors 910VDC 1W 7500A L/S=10mm Long LD
- ERZ-E14A911S1
- Panasonic Industry
-
1:
$1.42
-
1,900In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E14A911S1
End of Life
|
Panasonic Industry
|
Varistors 910VDC 1W 7500A L/S=10mm Long LD
|
|
1,900In Stock
|
|
|
$1.42
|
|
|
$1.04
|
|
|
$0.94
|
|
|
$0.834
|
|
|
View
|
|
|
$0.783
|
|
|
$0.754
|
|
|
$0.641
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E-S1
|
MOVs
|
PCB Mount
|
Radial
|
|
550 VAC
|
745 VDC
|
910 V
|
1.5 kV
|
17.5 mm
|
7.5 kA
|
510 J
|
400 pF
|
- 40 C
|
+ 125 C
|
|
Bulk
|
|
|
|
Varistors ERZ-E 5mm 200V Bulk ZNR Surge Absorber
- ERZ-E05A201CS
- Panasonic Industry
-
1:
$0.711
-
6,276In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E05A201CS
End of Life
|
Panasonic Industry
|
Varistors ERZ-E 5mm 200V Bulk ZNR Surge Absorber
|
|
6,276In Stock
|
|
|
$0.711
|
|
|
$0.424
|
|
|
$0.276
|
|
|
$0.25
|
|
|
View
|
|
|
$0.207
|
|
|
$0.14
|
|
|
$0.133
|
|
|
$0.127
|
|
|
$0.117
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
130 VAC
|
170 VDC
|
200 V
|
340 V
|
7 mm
|
1.2 kA
|
13 J
|
200 pF
|
- 40 C
|
+ 85 C
|
|
Bulk
|
|
|
|
Varistors ERZ-E 5mm 220V T&R ZNR Surge Absorber
- ERZ-E05F221
- Panasonic Industry
-
1:
$0.761
-
6,024In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E05F221
End of Life
|
Panasonic Industry
|
Varistors ERZ-E 5mm 220V T&R ZNR Surge Absorber
|
|
6,024In Stock
|
|
|
$0.761
|
|
|
$0.455
|
|
|
$0.285
|
|
|
$0.243
|
|
|
$0.128
|
|
|
View
|
|
|
$0.141
|
|
|
$0.123
|
|
Min.: 1
Mult.: 1
:
1,000
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
140 VAC
|
180 VDC
|
220 V
|
360 V
|
7 mm
|
1.2 kA
|
14 J
|
190 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape
|
|
|
|
Varistors ERZ-E 7mm 560V Bulk ZNR Surge Absorber
- ERZ-E07A561CS
- Panasonic Industry
-
1:
$0.811
-
9,148In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E07A561CS
End of Life
|
Panasonic Industry
|
Varistors ERZ-E 7mm 560V Bulk ZNR Surge Absorber
|
|
9,148In Stock
|
|
|
$0.811
|
|
|
$0.483
|
|
|
$0.304
|
|
|
$0.267
|
|
|
View
|
|
|
$0.228
|
|
|
$0.204
|
|
|
$0.14
|
|
|
$0.131
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
350 VAC
|
450 VDC
|
560 V
|
930 V
|
9 mm
|
2.5 kA
|
75 J
|
200 pF
|
- 40 C
|
+ 85 C
|
|
Bulk
|
|
|
|
Varistors 200VDC 0.6W 1mA L/S=7.5mm Cut LD
- ERZ-E11A201SC
- Panasonic Industry
-
1:
$1.35
-
2,750In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E11A201SC
End of Life
|
Panasonic Industry
|
Varistors 200VDC 0.6W 1mA L/S=7.5mm Cut LD
|
|
2,750In Stock
|
|
|
$1.35
|
|
|
$0.822
|
|
|
$0.538
|
|
|
$0.50
|
|
|
View
|
|
|
$0.426
|
|
|
$0.366
|
|
|
$0.273
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E-S1
|
MOVs
|
PCB Mount
|
Radial
|
|
130 VAC
|
170 VDC
|
200 V
|
340 V
|
13 mm
|
6 kA
|
70 J
|
690 pF
|
- 40 C
|
+ 125 C
|
|
Bulk
|
|
|
|
Varistors 270VDC 1W 7500A L/S=10mm Long LD
- ERZ-E14A271S1
- Panasonic Industry
-
1:
$0.89
-
1,825In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E14A271S1
End of Life
|
Panasonic Industry
|
Varistors 270VDC 1W 7500A L/S=10mm Long LD
|
|
1,825In Stock
|
|
|
$0.89
|
|
|
$0.69
|
|
|
$0.627
|
|
|
$0.587
|
|
|
View
|
|
|
$0.576
|
|
|
$0.573
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E-S1
|
MOVs
|
PCB Mount
|
Radial
|
|
175 VAC
|
225 VDC
|
270 V
|
455 V
|
16.5 mm
|
7.5 kA
|
190 J
|
1 nF
|
- 40 C
|
+ 125 C
|
|
Bulk
|
|
|
|
Varistors 510VDC 0.6W 1mA L/S=7.5mm Cut LD
- ERZ-E11A511SC
- Panasonic Industry
-
1:
$1.38
-
3,839In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E11A511SC
End of Life
|
Panasonic Industry
|
Varistors 510VDC 0.6W 1mA L/S=7.5mm Cut LD
|
|
3,839In Stock
|
|
|
$1.38
|
|
|
$0.84
|
|
|
$0.59
|
|
|
$0.548
|
|
|
View
|
|
|
$0.466
|
|
|
$0.302
|
|
|
$0.299
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E-S1
|
MOVs
|
PCB Mount
|
Radial
|
|
320 VAC
|
410 VDC
|
510 V
|
845 V
|
13 mm
|
6 kA
|
190 J
|
310 pF
|
- 40 C
|
+ 125 C
|
|
Bulk
|
|
|
|
Varistors 1000VDC 1W 7500A L/S=10mm Long LD
- ERZ-E14A102S1
- Panasonic Industry
-
1:
$2.49
-
630In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E14A102S1
End of Life
|
Panasonic Industry
|
Varistors 1000VDC 1W 7500A L/S=10mm Long LD
|
|
630In Stock
|
|
|
$2.49
|
|
|
$1.87
|
|
|
$1.69
|
|
|
$1.54
|
|
|
View
|
|
|
$1.50
|
|
|
$1.42
|
|
|
$1.35
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E-S1
|
MOVs
|
PCB Mount
|
Radial
|
|
625 VAC
|
825 VDC
|
1 kV
|
1.65 kV
|
17.5 mm
|
7.5 kA
|
565 J
|
400 pF
|
- 40 C
|
+ 125 C
|
|
Bulk
|
|
|
|
Varistors Multilayer Varistor100V 10pFmax. 0402 inch
- EZJ-P0V101BA
- Panasonic Industry
-
1:
$0.10
-
20,000In Stock
-
New Product
|
Mouser Part No
667-EZJ-P0V101BA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor100V 10pFmax. 0402 inch
|
|
20,000In Stock
|
|
|
$0.10
|
|
|
$0.049
|
|
|
$0.041
|
|
|
$0.037
|
|
|
View
|
|
|
$0.029
|
|
|
$0.035
|
|
|
$0.033
|
|
|
$0.031
|
|
|
$0.03
|
|
|
$0.029
|
|
Min.: 1
Mult.: 1
:
10,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0402 (1005 metric)
|
|
30 VDC
|
100 V
|
|
|
|
|
10 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors Multilayer Varistor27V 10pFmax. 0402 inch
- EZJ-P0V270BA
- Panasonic Industry
-
1:
$0.10
-
20,000In Stock
-
New Product
|
Mouser Part No
667-EZJ-P0V270BA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor27V 10pFmax. 0402 inch
|
|
20,000In Stock
|
|
|
$0.10
|
|
|
$0.047
|
|
|
$0.038
|
|
|
$0.035
|
|
|
View
|
|
|
$0.027
|
|
|
$0.033
|
|
|
$0.031
|
|
|
$0.029
|
|
|
$0.028
|
|
|
$0.027
|
|
Min.: 1
Mult.: 1
:
10,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0402 (1005 metric)
|
|
16 VDC
|
27 V
|
|
|
|
|
10 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors Multilayer Varistor27V 100pFmax. 0402 inch
- EZJ-P0V270GA
- Panasonic Industry
-
1:
$0.11
-
20,000In Stock
-
New Product
|
Mouser Part No
667-EZJ-P0V270GA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor27V 100pFmax. 0402 inch
|
|
20,000In Stock
|
|
|
$0.11
|
|
|
$0.06
|
|
|
$0.052
|
|
|
$0.047
|
|
|
View
|
|
|
$0.037
|
|
|
$0.044
|
|
|
$0.042
|
|
|
$0.04
|
|
|
$0.038
|
|
|
$0.037
|
|
Min.: 1
Mult.: 1
:
10,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0402 (1005 metric)
|
|
16 VDC
|
27 V
|
|
|
10 A
|
|
100 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors Multilayer Varistor33V 100pFmax. 0402 inch
- EZJ-P0V330GA
- Panasonic Industry
-
1:
$0.11
-
20,000In Stock
-
New Product
|
Mouser Part No
667-EZJ-P0V330GA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor33V 100pFmax. 0402 inch
|
|
20,000In Stock
|
|
|
$0.11
|
|
|
$0.062
|
|
|
$0.052
|
|
|
$0.047
|
|
|
View
|
|
|
$0.037
|
|
|
$0.044
|
|
|
$0.042
|
|
|
$0.04
|
|
|
$0.038
|
|
|
$0.037
|
|
Min.: 1
Mult.: 1
:
10,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0402 (1005 metric)
|
|
25 VDC
|
33 V
|
|
|
10 A
|
|
100 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors Multilayer Varistor42V 56pFmax. 0402 inch
- EZJ-P0V420WA
- Panasonic Industry
-
1:
$0.10
-
20,000In Stock
-
New Product
|
Mouser Part No
667-EZJ-P0V420WA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor42V 56pFmax. 0402 inch
|
|
20,000In Stock
|
|
|
$0.10
|
|
|
$0.052
|
|
|
$0.044
|
|
|
$0.04
|
|
|
View
|
|
|
$0.031
|
|
|
$0.037
|
|
|
$0.035
|
|
|
$0.033
|
|
|
$0.031
|
|
Min.: 1
Mult.: 1
:
10,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0402 (1005 metric)
|
|
30 VDC
|
42 V
|
|
|
6 A
|
|
56 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors Multilayer Varistor65V 27pFmax. 0402 inch
- EZJ-P0V650DA
- Panasonic Industry
-
1:
$0.10
-
20,000In Stock
-
New Product
|
Mouser Part No
667-EZJ-P0V650DA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor65V 27pFmax. 0402 inch
|
|
20,000In Stock
|
|
|
$0.10
|
|
|
$0.053
|
|
|
$0.044
|
|
|
$0.04
|
|
|
View
|
|
|
$0.03
|
|
|
$0.038
|
|
|
$0.036
|
|
|
$0.034
|
|
|
$0.033
|
|
|
$0.03
|
|
Min.: 1
Mult.: 1
:
10,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0402 (1005 metric)
|
|
40 VDC
|
65 V
|
|
|
2 A
|
|
27 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors Multilayer Varistor27V 100pFmax. 0603 inch
- EZJ-P1V270GA
- Panasonic Industry
-
1:
$0.261
-
8,000In Stock
-
New Product
|
Mouser Part No
667-EZJ-P1V270GA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor27V 100pFmax. 0603 inch
|
|
8,000In Stock
|
|
|
$0.261
|
|
|
$0.156
|
|
|
$0.134
|
|
|
$0.123
|
|
|
$0.099
|
|
|
View
|
|
|
$0.117
|
|
|
$0.11
|
|
|
$0.099
|
|
|
$0.094
|
|
Min.: 1
Mult.: 1
:
4,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0603 (1608 metric)
|
|
16 VDC
|
27 V
|
|
|
10 A
|
|
100 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors Multilayer Varistor33V 100pFmax. 0603 inch
- EZJ-P1V330GA
- Panasonic Industry
-
1:
$0.211
-
7,860In Stock
-
New Product
|
Mouser Part No
667-EZJ-P1V330GA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor33V 100pFmax. 0603 inch
|
|
7,860In Stock
|
|
|
$0.211
|
|
|
$0.124
|
|
|
$0.106
|
|
|
$0.097
|
|
|
$0.087
|
|
|
View
|
|
|
$0.092
|
|
|
$0.088
|
|
|
$0.083
|
|
Min.: 1
Mult.: 1
:
4,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0603 (1608 metric)
|
|
25 VDC
|
33 V
|
|
|
10 A
|
|
100 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors Multilayer Varistor42V 68pFmax. 0603 inch
- EZJ-P1V420FA
- Panasonic Industry
-
1:
$0.23
-
7,875In Stock
-
New Product
|
Mouser Part No
667-EZJ-P1V420FA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor42V 68pFmax. 0603 inch
|
|
7,875In Stock
|
|
|
$0.23
|
|
|
$0.136
|
|
|
$0.116
|
|
|
$0.107
|
|
|
$0.097
|
|
|
View
|
|
|
$0.101
|
|
|
$0.097
|
|
|
$0.091
|
|
Min.: 1
Mult.: 1
:
4,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0603 (1608 metric)
|
|
30 VDC
|
42 V
|
|
|
10 A
|
|
68 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors Multilayer Varistor65V 27pFmax. 0603 inch
- EZJ-P1V650DA
- Panasonic Industry
-
1:
$0.211
-
8,000In Stock
-
New Product
|
Mouser Part No
667-EZJ-P1V650DA
New Product
|
Panasonic Industry
|
Varistors Multilayer Varistor65V 27pFmax. 0603 inch
|
|
8,000In Stock
|
|
|
$0.211
|
|
|
$0.129
|
|
|
$0.11
|
|
|
$0.101
|
|
|
$0.09
|
|
|
View
|
|
|
$0.097
|
|
|
$0.091
|
|
|
$0.086
|
|
Min.: 1
Mult.: 1
:
4,000
|
|
|
EZJ-P
|
Varistor
|
PCB Mount
|
SMD/SMT
|
0603 (1608 metric)
|
|
40 VDC
|
65 V
|
|
|
6 A
|
|
27 pF
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Varistors 430V 25KA 60x55x14mm
- ERZ-C32EK431Y
- Panasonic Industry
-
1:
$29.55
-
110In Stock
-
End of Life
|
Mouser Part No
667-ERZ-C32EK431Y
End of Life
|
Panasonic Industry
|
Varistors 430V 25KA 60x55x14mm
|
|
110In Stock
|
|
|
$29.55
|
|
|
$25.96
|
|
|
$24.78
|
|
|
$22.17
|
|
|
View
|
|
|
$20.41
|
|
|
$20.35
|
|
|
Quote
|
|
Min.: 1
Mult.: 1
|
|
|
ZNR
|
MOVs
|
Chassis Mount
|
Screw
|
|
250 VAC
|
350 VDC
|
430 V
|
710 V
|
|
25 kA
|
400 J
|
2.5 nF
|
- 40 C
|
+ 85 C
|
|
Bulk
|
|
|
|
Varistors 470volts 4500A 10mm Straight Leads
- ERZ-E10A471
- Panasonic Industry
-
1:
$0.44
-
12,339In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E10A471
End of Life
|
Panasonic Industry
|
Varistors 470volts 4500A 10mm Straight Leads
|
|
12,339In Stock
|
|
|
$0.44
|
|
|
$0.256
|
|
|
$0.24
|
|
|
$0.222
|
|
|
View
|
|
|
$0.212
|
|
|
$0.204
|
|
|
$0.202
|
|
|
$0.20
|
|
|
$0.184
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
300 VAC
|
385 VDC
|
470 V
|
775 V
|
11.5 mm
|
4.5 kA
|
106 J
|
320 pF
|
- 40 C
|
+ 85 C
|
|
Bulk
|
|
|
|
Varistors ERZ-E 11mm 270V Bulk ZNR Surge Absorber
- ERZ-E11A271
- Panasonic Industry
-
1:
$0.49
-
11,482In Stock
-
End of Life
|
Mouser Part No
667-ERZ-E11A271
End of Life
|
Panasonic Industry
|
Varistors ERZ-E 11mm 270V Bulk ZNR Surge Absorber
|
|
11,482In Stock
|
|
|
$0.49
|
|
|
$0.283
|
|
|
$0.264
|
|
|
$0.245
|
|
|
View
|
|
|
$0.233
|
|
|
$0.204
|
|
|
$0.187
|
|
Min.: 1
Mult.: 1
|
|
|
ERZ-E10
|
MOVs
|
PCB Mount
|
Radial
|
|
175 VAC
|
225 VDC
|
270 V
|
455 V
|
13 mm
|
6 kA
|
99 J
|
580 pF
|
- 40 C
|
+ 85 C
|
|
Bulk
|
|
|
|
Varistors NEW SMALLER VERSION 667-ERZ-E08A241
- ERZ-V10D241
- Panasonic Industry
-
1:
$0.48
-
17,013In Stock
-
End of Life
|
Mouser Part No
667-ERZ-V10D241
End of Life
|
Panasonic Industry
|
Varistors NEW SMALLER VERSION 667-ERZ-E08A241
|
|
17,013In Stock
|
|
|
$0.48
|
|
|
$0.304
|
|
|
$0.263
|
|
|
$0.244
|
|
|
View
|
|
|
$0.233
|
|
|
$0.222
|
|
|
$0.211
|
|
|
$0.206
|
|
|
$0.20
|
|
Min.: 1
Mult.: 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
150 VAC
|
200 VDC
|
240 V
|
395 V
|
10 mm
|
3.5 kA
|
42 J
|
380 pF
|
- 40 C
|
+ 85 C
|
|
Bulk
|
|
|
|
Varistors 25V 10A CLAMP
- ERZ-V14D390
- Panasonic Industry
-
1:
$0.561
-
11,904In Stock
-
End of Life
|
Mouser Part No
667-ERZ-V14D390
End of Life
|
Panasonic Industry
|
Varistors 25V 10A CLAMP
|
|
11,904In Stock
|
|
|
$0.561
|
|
|
$0.352
|
|
|
$0.306
|
|
|
$0.285
|
|
|
View
|
|
|
$0.267
|
|
|
$0.261
|
|
|
$0.247
|
|
|
$0.242
|
|
|
$0.23
|
|
Min.: 1
Mult.: 1
|
|
|
V
|
MOVs
|
PCB Mount
|
Radial
|
|
25 VAC
|
31 VDC
|
39 V
|
77 V
|
14 mm
|
2 kA
|
11 J
|
7 nF
|
- 40 C
|
+ 85 C
|
|
Bulk
|
|
|
|
Varistors 240V 100A CLAMP
- ERZ-VF2M241
- Panasonic Industry
-
1:
$1.99
-
3,913In Stock
-
End of Life
|
Mouser Part No
667-ERZ-VF2M241
End of Life
|
Panasonic Industry
|
Varistors 240V 100A CLAMP
|
|
3,913In Stock
|
|
|
$1.99
|
|
|
$1.47
|
|
|
$1.34
|
|
|
$1.19
|
|
|
$0.951
|
|
|
View
|
|
|
$1.12
|
|
|
$1.08
|
|
|
$1.03
|
|
|
$0.922
|
|
Min.: 1
Mult.: 1
:
2,000
|
|
|
VF
|
MOVs
|
PCB Mount
|
SMD/SMT
|
|
150 VAC
|
200 VDC
|
240 V
|
395 V
|
|
600 A
|
10 J
|
|
- 40 C
|
+ 85 C
|
|
Reel, Cut Tape, MouseReel
|
|
South Africa