Transistors -bipolar

Manufacturer Series Transistor Type Voltage - Collector Emitter Breakdown (Maximum) Current - Collector Interrupt (max) Current - Collector (Ic) (Max) DC Current Gain (hFE) (Min) @ Ic, Vce Frequency-transition Power - Maximum Vce saturation (max) @lb, Ic Product Overview Operating Temperature Range Applications Mounting Type Device Package

Search Results:15695~  /   Part Number:  /   Stock Type:ALL  /   Quantity:0PCS~

Page 41 of 314  

Stock Type
Supplier Rank
Supplier Stock Location Image Part number /
Manufacturer / More information
QTY Date
Code
Unit Price Minimum Order Quantity /
Standard Packing Quantity
Estimated Ship Date ECAD Model Description
CoreStaff Part Number
Manufacturer Series Transistor Type Voltage - Collector Emitter Breakdown (Maximum) Current - Collector Interrupt (max) Current - Collector (Ic) (Max) DC Current Gain (hFE) (Min) @ Ic, Vce Frequency-transition Power - Maximum Vce saturation (max) @lb, Ic Product Overview Operating Temperature Range Applications Automotive Mounting Type Device Package
Franchise Stock
A-2
Supplier Stock

2SA2059(TE12L,F)

RoHS
1,900 2021+
50pcs ~  $0.502
1,000pcs ~  $0.238


MOQ : 50
SPQ : 50

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75188142

TOSHIBA PNP 20V 100 nA(ICBO) 3A 200 @ 500mA, 2V SOT-89-3 190mV @ 53mA, 1.6A TRANS PNP 20V 3A PW-MINI 150°C (TJ) AEC-Q101 PW-MINI
Franchise Stock
A-2
Supplier Stock

2SA2060(TE12L,F)

RoHS
4,300 2022+
100pcs ~  $0.398
1,000pcs ~  $0.204


MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75191218

TOSHIBA PNP 50V 100 nA(ICBO) 2A 200 @ 300mA, 2V SOT-89-3 200mV @ 33mA, 1A TRANS PNP 50V 2A PW-MINI 150°C (TJ) AEC-Q101 PW-MINI
Franchise Stock
A-2
Supplier Stock

RoHS
1,800 2013+
100pcs ~  $0.346
3,000pcs ~  $0.174


MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75187872

TOSHIBA PNP -20V -2.5A 200 -0.19V TRANS PNP 20V 2.5A TSM AEC-Q101 TSM
Franchise Stock
A-2
Supplier Stock

RoHS
2,100 2011+
50pcs ~  $0.52
3,000pcs ~  $0.243


MOQ : 50
SPQ : 50

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75188415

TOSHIBA PNP -20V -1.5A 200 -0.14V AEC-Q101 TSM
Franchise Stock
A-2
Supplier Stock

2SA2066(TE12L,F)

RoHS
550 2009+
50pcs ~  $0.925

MOQ : 50
SPQ : 50

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75185458

TOSHIBA PNP -10V -2A 200 -0.19V AEC-Q101 PW-Mini
Franchise Stock
A-2
Supplier Stock

2SA2070(TE12L,F)

RoHS
3,650 2023+
50pcs ~  $0.571
1,000pcs ~  $0.281


MOQ : 50
SPQ : 50

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75190816

TOSHIBA PNP 50V 100 nA(ICBO) 1A 200 @ 100mA, 2V SOT-89-3 200mV @ 10mA, 300mA TRANS PNP 50V 1A PW-MINI 150°C (TJ) AEC-Q101 PW-MINI
Franchise Stock
A-1
Supplier Stock

2SA2071P5T100Q

1,000
10pcs ~  $0.22
50pcs ~  $0.205
100pcs ~  $0.19
500pcs ~  $0.175
1,000pcs ~  $0.152
2,000pcs ~  $0.137


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904680

ROHM PNP -60V -3A 120 0.5 W TRANS PNP 60V 3A MPT3 AEC-Q101
Franchise Stock
A-2
Supplier Stock

2SA2071P5T100Q

RoHS
1,000 2023+
100pcs ~  $0.277
1,000pcs ~  $0.204


MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75186575

ROHM PNP -60V -3A 120 0.5 W TRANS PNP 60V 3A MPT3 AEC-Q101
Franchise Stock
A-2
Supplier Stock

RoHS
1,350 2012+
100pcs ~  $0.312
1,000pcs ~  $0.229


MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75187312

ROHM PNP 60V 3A 120 @ 100mA, 2V 180MHz SOT-223-4 500mV @ 200mA, 2A TRANS PNP 60V 3A MPT3 AEC-Q101 AEC-Q101
Franchise Stock
A-2
Supplier Stock

RoHS
350 2012+
50pcs ~  $0.589
2,500pcs ~  $0.416


MOQ : 50
SPQ : 50

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75182826

ROHM PNP 60V 1 μA(ICBO) 3A 120 @ 100mA, 2V 180MHz SOT-89-3 500mV @ 200mA, 2A TRANS PNP 60V 3A CPT3 150°C (TJ) AEC-Q101 CPT3
Franchise Stock
A-2
Supplier Stock

RoHS
2,000 2012+
200pcs ~  $0.147
3,000pcs ~  $0.105


MOQ : 200
SPQ : 200

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75188143

ROHM TRANS PNP 60V 0.5A UMT3
Franchise Stock
A-1
Supplier Stock

6,000
10pcs ~  $0.137
100pcs ~  $0.129
500pcs ~  $0.121
1,000pcs ~  $0.114
3,000pcs ~  $0.091
6,000pcs ~  $0.083


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904681

ROHM PNP 60V 1 μA(ICBO) 500mA 120 @ 50mA, 2V 400MHz SOT-323 500mV @ 10mA, 100mA TRANS PNP 60V 0.5A UMT3 150°C (TJ) AEC-Q101 AEC-Q101
Franchise Stock
A-2
Supplier Stock

RoHS
2,350 2012+
200pcs ~  $0.199
3,000pcs ~  $0.148


MOQ : 200
SPQ : 200

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75188658

ROHM TRANS PNP 60V 2A TSMT3
Franchise Stock
A-2
Supplier Stock

2SA2097(TE16L1,NQ)

RoHS
4,250 2022+
50pcs ~  $0.796
2,000pcs ~  $0.399


MOQ : 50
SPQ : 50

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75191207

TOSHIBA PNP -50V -5A 200 -0.27V TRANS PNP 50V 5A PW-MOLD AEC-Q101 New PW-Mold
Franchise Stock
A-2
Supplier Stock

2SA2119KT146

3,000 2012+
200pcs ~  $0.13
3,000pcs ~  $0.097


MOQ : 200
SPQ : 200

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75189715

ROHM PNP 12V 100 nA(ICBO) 500mA 270 @ 10mA, 2V 260MHz SOT-323 250mV @ 10mA, 200mA TRANS PNP 12V 0.5A SMT3 150°C (TJ) AEC-Q101 SMT3
Franchise Stock
A-1
Supplier Stock

2SA2119KT146

3,000
10pcs ~  $0.099
100pcs ~  $0.091
1,000pcs ~  $0.083
3,000pcs ~  $0.068
6,000pcs ~  $0.061
15,000pcs ~  $0.053


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904683

ROHM PNP 12V 100 nA(ICBO) 500mA 270 @ 10mA, 2V 260MHz SOT-323 250mV @ 10mA, 200mA TRANS PNP 12V 0.5A SMT3 150°C (TJ) AEC-Q101 SMT3
Franchise Stock
A-2
Supplier Stock

2SA2120-O(Q)

2SA2120-O(Q)
TOSHIBA

RoHS
285 2012+
10pcs ~  $3.46

MOQ : 10
SPQ : 10

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75182388

TOSHIBA PNP 200V 12A 80 @ 1A, 5V 25MHz TO-3P-3L 3V @ 800mA, 8A Through Hole TO-3P(N)
Franchise Stock
A-2
Supplier Stock

2SA2121-O(Q)

2SA2121-O(Q)
TOSHIBA

RoHS
335 2021+
5pcs ~  $5.025

MOQ : 5
SPQ : 5

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75182791

TOSHIBA PNP 200V 15A 80 @ 1A, 5V 25MHz 0.22 W 3V @ 1A, 10A TO-92 TO-3P(L)
Franchise Stock
A-2
Supplier Stock

2SA2142(TE16L1,NQ)

RoHS
7,800 2024+
50pcs ~  $0.778
2,000pcs ~  $0.39


MOQ : 50
SPQ : 50

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75192549

TOSHIBA PNP -600V -0.5A 70 -1V TRANS PNP 600V 0.5A PW-MOLD AEC-Q101 New PW-Mold
Franchise Stock
A-2
Supplier Stock

RoHS
4,100 2014+
200pcs ~  $0.096
8,000pcs ~  $0.044


MOQ : 200
SPQ : 200

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75191135

TOSHIBA PNP -50V -0.15A 120 -0.3V AEC-Q101 SOT-723 (VESM)
Franchise Stock
A-2
Supplier Stock

RoHS
7,400 2018+
200pcs ~  $0.104
8,000pcs ~  $0.052


MOQ : 200
SPQ : 200

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75192570

TOSHIBA PNP -50V -0.15A 120 -0.3V AEC-Q101 SOT-723 (VESM)
Franchise Stock
A-2
Supplier Stock

2SA2184(TE16L1,NQ)

RoHS
5,230 2020+
20pcs ~  $2.377

MOQ : 20
SPQ : 20

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75191755

TOSHIBA PNP -550V -1A 80 -0.7V AEC-Q101 New PW-Mold
Franchise Stock
A-2
Supplier Stock

RoHS
1,000 2023+
50pcs ~  $0.916
2,000pcs ~  $0.477


MOQ : 50
SPQ : 50

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75190867

TOSHIBA
Franchise Stock
A-2
Supplier Stock

2SA2206(TE12L,F)

RoHS
4,300 2023+
100pcs ~  $0.467
1,000pcs ~  $0.247


MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75191384

TOSHIBA PNP -80V -2A 100 -0.3V AEC-Q101 PW-Mini
Franchise Stock
A-2
Supplier Stock

2SA673AC-E
RENESAS

RoHS
1,000 2008+
100pcs ~  $0.699

MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75187038

RENESAS PNP 50V 500 nA(ICBO) 500mA 60 @ 10mA, 3V TO-92-3 600mV @ 15mA, 150mA 150°C (TJ) Through Hole TO-92
Franchise Stock
A-2
Supplier Stock

2SA673AD-E
RENESAS

RoHS
2,000 2007+
100pcs ~  $0.699

MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75188144

RENESAS PNP 50V 500 nA(ICBO) 500mA 320 @ 10mA, 3V TO-92-3 600mV @ 15mA, 150mA 150°C (TJ) Through Hole TO-92
Franchise Stock
A-2
Supplier Stock

2SA940A(F)
TOSHIBA

RoHS
30 2006+
20pcs ~  $3.238

MOQ : 20
SPQ : 20

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75178725

TOSHIBA
Franchise Stock
A-2
Supplier Stock

RoHS
1,000 2010+
100pcs ~  $1.044

MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75186576

TOSHIBA
Franchise Stock
A-2
Supplier Stock

2SA965-O,F(J
TOSHIBA

RoHS
2,000
100pcs ~  $1.044

MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75188145

TOSHIBA PNP 120V 100 nA(ICBO) 800mA 80 @ 100mA, 5V 120MHz 900 mW 1V @ 50mA, 500mA TRANS PNP 120V 0.8A TO-92MOD 150°C (TJ) TO-92 TO-92MOD
Franchise Stock
A-2
Supplier Stock

2SA965-Y,F(J
TOSHIBA

RoHS
2,100 2018+
100pcs ~  $1.044

MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75188416

TOSHIBA TRANS PNP 120V 0.8A TO-92MOD
Franchise Stock
A-2
Supplier Stock

2SAR293P5T100

600 2016+
200pcs ~  $0.13
1,000pcs ~  $0.10


MOQ : 200
SPQ : 200

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75186051

ROHM TRANS PNP 30V 1A MPT3
Franchise Stock
A-1
Supplier Stock

2SAR293PHZGT100

1,000
10pcs ~  $0.342
50pcs ~  $0.319
100pcs ~  $0.296
500pcs ~  $0.273
1,000pcs ~  $0.228
2,000pcs ~  $0.213


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904685

ROHM PNP 30V 100 nA(ICBO) 1A 270 @ 100mA, 2V 320MHz TO-92-3 350mV @ 25mA, 500mA TRANS PNP 30V 1A SOT-89 150°C (TJ) Automotive Yes AEC-Q101 AEC-Q101
Franchise Stock
A-2
Supplier Stock

RoHS
800 2012+
200pcs ~  $0.19
1,000pcs ~  $0.152


MOQ : 200
SPQ : 200

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75186050

ROHM PNP 30V 100 nA(ICBO) 1A 270 @ 100mA, 2V 320MHz SOT-223-4 350mV @ 25mA, 500mA TRANS PNP 30V 1A MPT3 AEC-Q101 AEC-Q101
Franchise Stock
A-2
Supplier Stock

RoHS
2,000
100pcs ~  $0.329
1,000pcs ~  $0.247


MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75187136

ROHM
Franchise Stock
A-1
Supplier Stock

100
10pcs ~  $0.547
50pcs ~  $0.509
100pcs ~  $0.471
500pcs ~  $0.433
1,000pcs ~  $0.364
2,000pcs ~  $0.334


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904687

ROHM PNP -400V -0.1A 82 TRANS PNP 400V 0.1A MPT3 General Purpose Surface Mount SC-62
Franchise Stock
A-2
Supplier Stock

2SAR340QTRP

RoHS
50 2015+
100pcs ~  $0.294
3,000pcs ~  $0.209


MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75179149

ROHM PNP -400V -0.1A 82 0.5 W TSMT6
Franchise Stock
A-1
Supplier Stock

2SAR372P5T100Q

1,100
10pcs ~  $0.197
50pcs ~  $0.182
100pcs ~  $0.167
500pcs ~  $0.152
1,000pcs ~  $0.129
2,000pcs ~  $0.121


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904688

ROHM PNP 120V 1 μA(ICBO) 700mA 120 @ 100mA, 5V 300MHz TO-92-3 360mV @ 50mA, 500mA TRANS PNP 120V 0.7A MPT3 150°C (TJ) AEC-Q101 AEC-Q101
Franchise Stock
A-1
Supplier Stock

100
10pcs ~  $0.197
50pcs ~  $0.182
100pcs ~  $0.167
500pcs ~  $0.152
1,000pcs ~  $0.129
2,000pcs ~  $0.121


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904689

ROHM TRANS PNP 120V 0.7A MPT3
Franchise Stock
A-1
Supplier Stock

2SAR375P5T100Q

1,000
10pcs ~  $0.22
50pcs ~  $0.205
100pcs ~  $0.19
500pcs ~  $0.175
1,000pcs ~  $0.144
2,000pcs ~  $0.137


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904690

ROHM PNP 120V 1 μA(ICBO) 1.5A 120 @ 200mA, 5V 280MHz TO-92-3 320mV @ 80mA, 800mA TRANS PNP 120V 1.5A MPT3 150°C (TJ) AEC-Q101 AEC-Q101
Franchise Stock
A-1
Supplier Stock

2,000
10pcs ~  $0.22
50pcs ~  $0.205
100pcs ~  $0.19
500pcs ~  $0.175
1,000pcs ~  $0.144
2,000pcs ~  $0.137


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904691

ROHM TRANS PNP 120V 1.5A MPT3
Franchise Stock
A-1
Supplier Stock

2SAR502E3HZGTL

3,100
10pcs ~  $0.091
100pcs ~  $0.083
1,000pcs ~  $0.076
3,000pcs ~  $0.061
15,000pcs ~  $0.053


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904692

ROHM PNP 30V 200 nA(ICBO) 500mA 200 @ 100mA, 2V 520MHz SC-70-3 (SOT323) 400mV @ 10mA, 200mA TRANS PNP 30V 0.5A EMT3 150°C (TJ) AEC-Q101 AEC-Q101
Franchise Stock
A-1
Supplier Stock

2SAR502E3TL

3,100
10pcs ~  $0.076
100pcs ~  $0.068
1,000pcs ~  $0.061
3,000pcs ~  $0.053
6,000pcs ~  $0.046
15,000pcs ~  $0.038


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904693

ROHM PNP 30V 200 nA(ICBO) 500mA 200 @ 100mA, 2V 520MHz SC-70-3 (SOT323) 400mV @ 10mA, 200mA TRANS PNP 30V 0.5A EMT3 150°C (TJ) AEC-Q101 AEC-Q101
Franchise Stock
A-2
Supplier Stock

2SAR502EBTL

6,000 2025+
500pcs ~  $0.062

MOQ : 500
SPQ : 500

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75192381

ROHM PNP 30V 200 nA(ICBO) 500mA 200 @ 100mA, 2V 520MHz SC-70-3 (SOT323) 400mV @ 10mA, 200mA TRANS PNP 30V 0.5A EMT3F 150°C (TJ) AEC-Q101 AEC-Q101
Franchise Stock
A-1
Supplier Stock

2SAR502U3HZGT106

3,000
10pcs ~  $0.083
500pcs ~  $0.076
1,000pcs ~  $0.068
3,000pcs ~  $0.061
6,000pcs ~  $0.053
15,000pcs ~  $0.046


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904695

ROHM PNP -30V -0.5A 200 0.2 W TRANS PNP 30V 0.5A UMT3 AEC-Q101
Franchise Stock
A-2
Supplier Stock

2SAR502U3T106

3,000 2025+
200pcs ~  $0.096
3,000pcs ~  $0.062


MOQ : 200
SPQ : 200

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75189718

ROHM PNP 30V 200 nA(ICBO) 500mA 200 @ 100mA, 2V 520MHz SOT-323 400mV @ 10mA, 200mA TRANS PNP 30V 0.5A UMT3 150°C (TJ) AEC-Q101 AEC-Q101
Franchise Stock
A-1
Supplier Stock

2SAR502U3T106

3,000
40pcs ~  $0.076
100pcs ~  $0.068
500pcs ~  $0.061
3,000pcs ~  $0.046
15,000pcs ~  $0.038


MOQ : 40
SPQ : 40

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904696

ROHM PNP 30V 200 nA(ICBO) 500mA 200 @ 100mA, 2V 520MHz SOT-323 400mV @ 10mA, 200mA TRANS PNP 30V 0.5A UMT3 150°C (TJ) AEC-Q101 AEC-Q101
Franchise Stock
A-2
Supplier Stock

2SAR502UBTL

2,200 2012+
500pcs ~  $0.045

MOQ : 500
SPQ : 500

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75188510

ROHM PNP 30V 200 nA(ICBO) 500mA 200 @ 100mA, 2V 520MHz SOT-323 400mV @ 10mA, 200mA TRANS PNP 30V 0.5A UMT3F 150°C (TJ) AEC-Q101 UMT3F
Franchise Stock
A-1
Supplier Stock

2SAR502UBTL

6,000
10pcs ~  $0.053
100pcs ~  $0.046
1,000pcs ~  $0.038
3,000pcs ~  $0.03


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904697

ROHM PNP 30V 200 nA(ICBO) 500mA 200 @ 100mA, 2V 520MHz SOT-323 400mV @ 10mA, 200mA TRANS PNP 30V 0.5A UMT3F 150°C (TJ) AEC-Q101 UMT3F
Franchise Stock
A-1
Supplier Stock

2SAR512P5T100

990
10pcs ~  $0.182
50pcs ~  $0.167
100pcs ~  $0.159
500pcs ~  $0.144
1,000pcs ~  $0.121
2,000pcs ~  $0.114


MOQ : 10
SPQ : 10

Detail

Approx. 6 days

Certified in Japan
CoreStaff Part Number:st74904698

ROHM PNP -30V -2A 200 TRANS PNP 30V 2A MPT3 AEC-Q101
Franchise Stock
A-2
Supplier Stock

2SAR512P5T100

1,000 2015+
100pcs ~  $0.234
1,000pcs ~  $0.16


MOQ : 100
SPQ : 100

Detail

Approx. 4 days

Certified in Japan
CoreStaff Part Number:st75186578

ROHM PNP -30V -2A 200 TRANS PNP 30V 2A MPT3 AEC-Q101

Recommended Rectifiers - Transistors -bipolar