|
|
Schaltregler 5V or Adjustable, Low-Voltage, Step-Up D
- MAX608EPA+
- Analog Devices / Maxim Integrated
-
1:
CHF 5.27
-
92Auf Lager
|
Mouser-Teilenr.
700-MAX608EPA
|
Analog Devices / Maxim Integrated
|
Schaltregler 5V or Adjustable, Low-Voltage, Step-Up D
|
|
92Auf Lager
|
|
|
CHF 5.27
|
|
|
CHF 4.05
|
|
|
CHF 3.56
|
|
|
CHF 3.40
|
|
|
Anzeigen
|
|
|
CHF 3.25
|
|
|
CHF 3.16
|
|
|
CHF 3.00
|
|
|
CHF 2.95
|
|
|
Kostenvoranschlag
|
|
Min.: 1
Mult.: 1
|
|
|
Boost
|
1 Output
|
300 kHz
|
50 %
|
|
5 V, 3 V to 16.5 V
|
1.5 A
|
- 40 C
|
+ 85 C
|
Through Hole
|
PDIP-8
|
|
Tube
|
|
|
|
Schaltregler 1.8V to 28V Input, PWM Step-Up Controllers in MAX
- MAX669EUB/V+
- Analog Devices / Maxim Integrated
-
1:
CHF 7.08
-
37Auf Lager
|
Mouser-Teilenr.
700-MAX669EUB/V+
|
Analog Devices / Maxim Integrated
|
Schaltregler 1.8V to 28V Input, PWM Step-Up Controllers in MAX
|
|
37Auf Lager
|
|
|
CHF 7.08
|
|
|
CHF 5.50
|
|
|
CHF 4.86
|
|
|
CHF 4.66
|
|
|
Anzeigen
|
|
|
CHF 4.46
|
|
|
CHF 4.33
|
|
|
CHF 4.18
|
|
|
CHF 4.13
|
|
Min.: 1
Mult.: 1
|
|
|
Boost
|
1 Output
|
500 kHz
|
94 %
|
|
3 V to 28 V
|
1 A
|
- 40 C
|
+ 85 C
|
SMD/SMT
|
UMAX-10
|
AEC-Q100
|
Tube
|
|
|
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
- MAX770ESA+
- Analog Devices / Maxim Integrated
-
1:
CHF 8.47
-
15Auf Lager
|
Mouser-Teilenr.
700-MAX770ESA
|
Analog Devices / Maxim Integrated
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
|
|
15Auf Lager
|
|
|
CHF 8.47
|
|
|
CHF 6.62
|
|
|
CHF 6.16
|
|
|
CHF 5.64
|
|
|
Anzeigen
|
|
|
CHF 5.35
|
|
|
CHF 5.25
|
|
|
CHF 5.12
|
|
|
Kostenvoranschlag
|
|
Min.: 1
Mult.: 1
|
|
|
Boost
|
1 Output
|
300 kHz
|
50 %
|
|
3 V, 5 V
|
1 A
|
- 40 C
|
+ 85 C
|
SMD/SMT
|
SOIC-Narrow-8
|
|
Tube
|
|
|
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
- MAX772CSA+
- Analog Devices / Maxim Integrated
-
1:
CHF 6.40
-
80Auf Lager
|
Mouser-Teilenr.
700-MAX772CSA
|
Analog Devices / Maxim Integrated
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
|
|
80Auf Lager
|
|
|
CHF 6.40
|
|
|
CHF 4.95
|
|
|
CHF 4.60
|
|
|
CHF 4.19
|
|
|
Anzeigen
|
|
|
CHF 3.97
|
|
|
CHF 3.89
|
|
|
CHF 3.78
|
|
|
CHF 3.73
|
|
Min.: 1
Mult.: 1
|
|
|
Boost
|
1 Output
|
300 kHz
|
50 %
|
|
3 V, 15 V
|
1 A
|
0 C
|
+ 70 C
|
SMD/SMT
|
SOIC-Narrow-8
|
|
Tube
|
|
|
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
- MAX772ESA+
- Analog Devices / Maxim Integrated
-
1:
CHF 8.47
-
57Auf Lager
|
Mouser-Teilenr.
700-MAX772ESA
|
Analog Devices / Maxim Integrated
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
|
|
57Auf Lager
|
|
|
CHF 8.47
|
|
|
CHF 6.62
|
|
|
CHF 6.16
|
|
|
CHF 5.64
|
|
|
Anzeigen
|
|
|
CHF 5.35
|
|
|
CHF 5.25
|
|
|
CHF 5.07
|
|
|
Kostenvoranschlag
|
|
Min.: 1
Mult.: 1
|
|
|
Boost
|
1 Output
|
300 kHz
|
50 %
|
|
3 V, 15 V
|
1 A
|
- 40 C
|
+ 85 C
|
SMD/SMT
|
SOIC-Narrow-8
|
|
Tube
|
|
|
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
- MAX773CSD+
- Analog Devices / Maxim Integrated
-
1:
CHF 6.96
-
82Auf Lager
|
Mouser-Teilenr.
700-MAX773CSD
|
Analog Devices / Maxim Integrated
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
|
|
82Auf Lager
|
|
|
CHF 6.96
|
|
|
CHF 5.41
|
|
|
CHF 4.78
|
|
|
CHF 4.58
|
|
|
Anzeigen
|
|
|
CHF 4.37
|
|
|
CHF 4.26
|
|
|
CHF 4.10
|
|
|
CHF 4.05
|
|
Min.: 1
Mult.: 1
|
|
|
Boost
|
1 Output
|
300 kHz
|
50 %
|
|
3 V, 5 V, 12 V, 15 V
|
1 A
|
0 C
|
+ 70 C
|
SMD/SMT
|
SOIC-14
|
|
Tube
|
|
|
|
Schaltregler -5V/-12V/-15V or Adjustable, High-Effici
- MAX774EPA+
- Analog Devices / Maxim Integrated
-
1:
CHF 10.13
-
41Auf Lager
|
Mouser-Teilenr.
700-MAX774EPA
|
Analog Devices / Maxim Integrated
|
Schaltregler -5V/-12V/-15V or Adjustable, High-Effici
|
|
41Auf Lager
|
|
|
CHF 10.13
|
|
|
CHF 7.96
|
|
|
CHF 7.09
|
|
|
CHF 6.82
|
|
|
Anzeigen
|
|
|
CHF 6.54
|
|
|
CHF 6.37
|
|
|
CHF 6.16
|
|
Min.: 1
Mult.: 1
|
|
|
|
1 Output
|
300 kHz
|
|
|
- 5 V
|
1 A
|
- 40 C
|
+ 85 C
|
Through Hole
|
PDIP-8
|
|
Tube
|
|
|
|
Schaltregler -5V/-12V/-15V or Adjustable, High-Effici
- MAX775CSA+
- Analog Devices / Maxim Integrated
-
1:
CHF 7.35
-
43Auf Lager
|
Mouser-Teilenr.
700-MAX775CSA+
|
Analog Devices / Maxim Integrated
|
Schaltregler -5V/-12V/-15V or Adjustable, High-Effici
|
|
43Auf Lager
|
|
|
CHF 7.35
|
|
|
CHF 5.72
|
|
|
CHF 4.85
|
|
|
CHF 4.60
|
|
|
Anzeigen
|
|
|
CHF 4.50
|
|
|
CHF 4.26
|
|
|
CHF 4.21
|
|
Min.: 1
Mult.: 1
|
|
|
|
1 Output
|
300 kHz
|
|
|
- 12 V
|
500 mA
|
0 C
|
+ 70 C
|
SMD/SMT
|
SOIC-Narrow-8
|
|
Tube
|
|
|
|
Schaltregler -5V/-12V/-15V or Adjustable, High-Effici
- MAX776CPA+
- Analog Devices / Maxim Integrated
-
1:
CHF 8.36
-
72Auf Lager
|
Mouser-Teilenr.
700-MAX776CPA
|
Analog Devices / Maxim Integrated
|
Schaltregler -5V/-12V/-15V or Adjustable, High-Effici
|
|
72Auf Lager
|
|
|
CHF 8.36
|
|
|
CHF 6.49
|
|
|
CHF 5.73
|
|
|
CHF 4.58
|
|
|
Anzeigen
|
|
|
CHF 4.37
|
|
|
CHF 4.26
|
|
|
CHF 4.04
|
|
|
CHF 4.00
|
|
|
Kostenvoranschlag
|
|
Min.: 1
Mult.: 1
|
|
|
|
1 Output
|
300 kHz
|
|
|
- 15 V
|
400 mA
|
0 C
|
+ 70 C
|
Through Hole
|
PDIP-8
|
|
Tube
|
|
|
|
Schaltregler -5V/-12V/-15V or Adjustable, High-Effici
- MAX776CSA+
- Analog Devices / Maxim Integrated
-
1:
CHF 7.30
-
127Auf Lager
|
Mouser-Teilenr.
700-MAX776CSA+
|
Analog Devices / Maxim Integrated
|
Schaltregler -5V/-12V/-15V or Adjustable, High-Effici
|
|
127Auf Lager
|
|
|
CHF 7.30
|
|
|
CHF 5.68
|
|
|
CHF 5.28
|
|
|
CHF 4.82
|
|
|
Anzeigen
|
|
|
CHF 4.57
|
|
|
CHF 4.48
|
|
|
CHF 4.37
|
|
|
CHF 4.19
|
|
|
Kostenvoranschlag
|
|
Min.: 1
Mult.: 1
|
|
|
|
1 Output
|
300 kHz
|
|
|
- 15 V
|
400 mA
|
0 C
|
+ 70 C
|
SMD/SMT
|
SOIC-Narrow-8
|
|
Tube
|
|
|
|
Schaltregler Step-Down Controllers with Prebias Start
- MAX8544EEP+
- Analog Devices / Maxim Integrated
-
1:
CHF 5.08
-
147Auf Lager
|
Mouser-Teilenr.
700-MAX8544EEP
|
Analog Devices / Maxim Integrated
|
Schaltregler Step-Down Controllers with Prebias Start
|
|
147Auf Lager
|
|
|
CHF 5.08
|
|
|
CHF 3.91
|
|
|
CHF 3.42
|
|
|
CHF 3.27
|
|
|
Anzeigen
|
|
|
CHF 3.12
|
|
|
CHF 3.03
|
|
|
CHF 2.95
|
|
|
CHF 2.86
|
|
Min.: 1
Mult.: 1
|
|
|
Buck
|
1 Output
|
800 kHz to 1.2 MHz
|
|
|
800 mV to 11.88 V
|
25 A
|
- 40 C
|
+ 85 C
|
SMD/SMT
|
QSOP-20
|
|
Tube
|
|
|
|
Schaltregler Low-Cost, Wide Input Range, Step-Down Co
- MAX8545EUB+
- Analog Devices / Maxim Integrated
-
1:
CHF 4.03
-
94Auf Lager
|
Mouser-Teilenr.
700-MAX8545EUB
|
Analog Devices / Maxim Integrated
|
Schaltregler Low-Cost, Wide Input Range, Step-Down Co
|
|
94Auf Lager
|
|
|
CHF 4.03
|
|
|
CHF 3.08
|
|
|
CHF 2.69
|
|
|
CHF 2.57
|
|
|
Anzeigen
|
|
|
CHF 2.44
|
|
|
CHF 2.36
|
|
|
CHF 2.29
|
|
|
CHF 2.22
|
|
Min.: 1
Mult.: 1
|
|
|
Buck
|
1 Output
|
300 kHz
|
95 %
|
|
800 mV to 23 V
|
15 A
|
- 40 C
|
+ 85 C
|
SMD/SMT
|
UMAX-10
|
|
Tube
|
|
|
|
Schaltregler Low-Cost, Wide Input Range, Step-Down Co
- MAX8546EUB+
- Analog Devices / Maxim Integrated
-
1:
CHF 4.03
-
12Auf Lager
|
Mouser-Teilenr.
700-MAX8546EUB
|
Analog Devices / Maxim Integrated
|
Schaltregler Low-Cost, Wide Input Range, Step-Down Co
|
|
12Auf Lager
|
|
|
CHF 4.03
|
|
|
CHF 3.08
|
|
|
CHF 2.69
|
|
|
CHF 2.57
|
|
|
Anzeigen
|
|
|
CHF 2.44
|
|
|
CHF 2.36
|
|
|
CHF 2.30
|
|
|
CHF 2.23
|
|
Min.: 1
Mult.: 1
|
|
|
Buck
|
1 Output
|
300 kHz
|
95 %
|
|
800 mV to 23 V
|
15 A
|
- 40 C
|
+ 85 C
|
SMD/SMT
|
UMAX-10
|
|
Tube
|
|
|
|
Schaltregler Low-Cost, Wide Input Range, Step-Down Co
- MAX8548EUB+
- Analog Devices / Maxim Integrated
-
1:
CHF 4.84
-
12Auf Lager
|
Mouser-Teilenr.
700-MAX8548EUB
|
Analog Devices / Maxim Integrated
|
Schaltregler Low-Cost, Wide Input Range, Step-Down Co
|
|
12Auf Lager
|
|
|
CHF 4.84
|
|
|
CHF 3.69
|
|
|
CHF 2.69
|
|
|
CHF 2.57
|
|
|
Anzeigen
|
|
|
CHF 2.44
|
|
|
CHF 2.36
|
|
|
CHF 2.30
|
|
|
CHF 2.23
|
|
Min.: 1
Mult.: 1
|
|
|
Buck
|
1 Output
|
100 kHz
|
95 %
|
|
800 mV to 23 V
|
15 A
|
- 40 C
|
+ 85 C
|
SMD/SMT
|
UMAX-10
|
|
Tube
|
|
|
|
Schaltregler High-Efficiency, 10A, PWM Internal-Switc
- MAX8566ETJ+
- Analog Devices / Maxim Integrated
-
1:
CHF 18.61
-
57Auf Lager
|
Mouser-Teilenr.
700-MAX8566ETJ
|
Analog Devices / Maxim Integrated
|
Schaltregler High-Efficiency, 10A, PWM Internal-Switc
|
|
57Auf Lager
|
|
|
CHF 18.61
|
|
|
CHF 14.56
|
|
|
CHF 13.91
|
|
|
CHF 11.37
|
|
|
Anzeigen
|
|
|
CHF 10.96
|
|
|
CHF 10.61
|
|
|
CHF 10.53
|
|
Min.: 1
Mult.: 1
|
|
|
Buck
|
1 Output
|
250 kHz to 2.4 MHz
|
95 %
|
|
600 mV to 3.1 V
|
10 A
|
- 40 C
|
+ 85 C
|
SMD/SMT
|
TQFN-32
|
|
Tube
|
|
|
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
- MAX771CPA+
- Analog Devices / Maxim Integrated
-
1:
CHF 5.74
-
3Auf Lager
-
NRND
|
Mouser-Teilenr.
700-MAX771CPA
NRND
|
Analog Devices / Maxim Integrated
|
Schaltregler 5V/12V/15V or Adjustable, High-Efficienc
|
|
3Auf Lager
|
|
|
CHF 5.74
|
|
|
CHF 4.43
|
|
|
CHF 3.89
|
|
|
CHF 3.73
|
|
|
Anzeigen
|
|
|
CHF 3.56
|
|
|
CHF 3.45
|
|
|
CHF 3.37
|
|
|
CHF 3.35
|
|
Min.: 1
Mult.: 1
|
|
|
Boost
|
1 Output
|
300 kHz
|
50 %
|
|
3 V, 12 V
|
1 A
|
0 C
|
+ 70 C
|
Through Hole
|
PDIP-8
|
|
Tube
|
|
|
|
Schaltregler 1x PhBuck DC/DC Cntr w/ Dig Pwr S M
- LTC3883IUH-1#WPBF
- Analog Devices
-
1:
CHF 13.13
-
3Auf Lager
|
Mouser-Teilenr.
584-3883IUH-1#WPBF
|
Analog Devices
|
Schaltregler 1x PhBuck DC/DC Cntr w/ Dig Pwr S M
|
|
3Auf Lager
|
|
|
CHF 13.13
|
|
|
CHF 10.41
|
|
|
CHF 9.13
|
|
|
CHF 8.78
|
|
|
Anzeigen
|
|
|
CHF 8.46
|
|
|
CHF 8.25
|
|
|
CHF 8.05
|
|
|
Kostenvoranschlag
|
|
Min.: 1
Mult.: 1
|
|
|
Buck
|
1 Output
|
250 kHz to 1 MHz
|
|
|
500 mV to 5.4 V
|
30 A
|
- 40 C
|
+ 125 C
|
SMD/SMT
|
QFN-32
|
AEC-Q100
|
Tube
|
|
|
|
Schaltregler Isolated, Synchronous Forward Controller with Active Clamp and iCoupler
- ADP1074ACCZ
- Analog Devices
-
1:
CHF 11.31
-
150Auf Lager
|
Mouser-Teilenr.
584-ADP1074ACCZ
|
Analog Devices
|
Schaltregler Isolated, Synchronous Forward Controller with Active Clamp and iCoupler
|
|
150Auf Lager
|
|
|
CHF 11.31
|
|
|
CHF 8.92
|
|
|
CHF 7.70
|
|
|
CHF 7.32
|
|
|
Anzeigen
|
|
|
CHF 7.14
|
|
|
CHF 7.01
|
|
Min.: 1
Mult.: 1
|
|
|
Forward
|
1 Output
|
50 kHz to 600 kHz
|
55 %
|
|
8 V
|
1 A
|
- 40 C
|
+ 125 C
|
SMD/SMT
|
LGA-24
|
|
Tray
|
|
|
|
Schaltregler Hi Pwr Sync DC/DC Cntr
- LT1339CN#PBF
- Analog Devices
-
1:
CHF 13.77
-
53Auf Lager
|
Mouser-Teilenr.
584-LT1339CN#PBF
|
Analog Devices
|
Schaltregler Hi Pwr Sync DC/DC Cntr
|
|
53Auf Lager
|
|
|
CHF 13.77
|
|
|
CHF 10.46
|
|
|
CHF 9.99
|
|
|
CHF 9.40
|
|
|
Anzeigen
|
|
|
CHF 9.06
|
|
|
CHF 8.84
|
|
|
CHF 8.80
|
|
|
Kostenvoranschlag
|
|
Min.: 1
Mult.: 1
|
|
|
Boost, Buck
|
1 Output
|
150 kHz
|
90 %
|
|
Adjustable
|
30 A
|
0 C
|
+ 70 C
|
Through Hole
|
PDIP-20
|
|
Tube
|
|
|
|
Schaltregler Boost, Fly, SEPIC & Inv Cntr
- LT3757AIDD#PBF
- Analog Devices
-
1:
CHF 6.54
-
137Auf Lager
|
Mouser-Teilenr.
584-LT3757AIDD#PBF
|
Analog Devices
|
Schaltregler Boost, Fly, SEPIC & Inv Cntr
|
|
137Auf Lager
|
|
|
CHF 6.54
|
|
|
CHF 5.07
|
|
|
CHF 4.70
|
|
|
CHF 4.26
|
|
|
Anzeigen
|
|
|
CHF 4.02
|
|
|
CHF 3.95
|
|
|
CHF 3.87
|
|
|
Kostenvoranschlag
|
|
Min.: 1
Mult.: 1
|
|
|
Boost, Flyback, Inverting, SEPIC
|
1 Output
|
100 kHz to 1 MHz
|
|
|
7.2 V
|
20 mA
|
- 40 C
|
+ 125 C
|
SMD/SMT
|
DFN-10
|
|
Tube
|
|
|
|
Schaltregler Boost, Fly, SEPIC & Inv Cntr
- LT3757AIDD#TRPBF
- Analog Devices
-
1:
CHF 6.54
-
265Auf Lager
|
Mouser-Teilenr.
584-LT3757AIDD#TRPBF
|
Analog Devices
|
Schaltregler Boost, Fly, SEPIC & Inv Cntr
|
|
265Auf Lager
|
|
|
CHF 6.54
|
|
|
CHF 5.07
|
|
|
CHF 4.70
|
|
|
CHF 4.31
|
|
|
CHF 4.14
|
|
|
CHF 3.79
|
|
Min.: 1
Mult.: 1
:
2'500
|
|
|
Boost, Flyback, Inverting, SEPIC
|
1 Output
|
100 kHz to 1 MHz
|
|
|
7.2 V
|
20 mA
|
- 40 C
|
+ 125 C
|
SMD/SMT
|
DFN-10
|
|
Reel, Cut Tape, MouseReel
|
|
|
|
Schaltregler 100Vin For Conv Cntr
- LT8310EFE#PBF
- Analog Devices
-
1:
CHF 7.65
-
117Auf Lager
|
Mouser-Teilenr.
584-LT8310EFE#PBF
|
Analog Devices
|
Schaltregler 100Vin For Conv Cntr
|
|
117Auf Lager
|
|
|
CHF 7.65
|
|
|
CHF 5.96
|
|
|
CHF 5.16
|
|
|
CHF 4.96
|
|
|
Anzeigen
|
|
|
CHF 4.80
|
|
|
CHF 4.70
|
|
|
CHF 4.36
|
|
Min.: 1
Mult.: 1
|
|
|
Forward
|
1 Output
|
500 kHz
|
82 %
|
|
|
|
- 40 C
|
+ 125 C
|
SMD/SMT
|
TSSOP-20
|
|
Tube
|
|
|
|
Schaltregler 80V Bidirectional Buck-Boost Controller
- LT8708ELWE#PBF
- Analog Devices
-
1:
CHF 16.21
-
120Auf Lager
|
Mouser-Teilenr.
584-LT8708ELWE#PBF
|
Analog Devices
|
Schaltregler 80V Bidirectional Buck-Boost Controller
|
|
120Auf Lager
|
|
|
CHF 16.21
|
|
|
CHF 13.10
|
|
|
CHF 12.56
|
|
|
CHF 11.07
|
|
|
Anzeigen
|
|
|
CHF 10.52
|
|
|
CHF 10.08
|
|
|
CHF 9.52
|
|
Min.: 1
Mult.: 1
|
|
|
Buck-Boost
|
1 Output
|
400 kHz
|
80 %
|
|
1.3 V to 80 V
|
15 A
|
- 40 C
|
+ 125 C
|
SMD/SMT
|
eLQFP-64
|
|
Tray
|
|
|
|
Schaltregler 80V Synch 4-Switch Buck-Boost DC/DC Cont
- LT8708EUHG-1#PBF
- Analog Devices
-
1:
CHF 15.53
-
25Auf Lager
|
Mouser-Teilenr.
584-LT8708EUHG1PB
|
Analog Devices
|
Schaltregler 80V Synch 4-Switch Buck-Boost DC/DC Cont
|
|
25Auf Lager
|
|
|
CHF 15.53
|
|
|
CHF 12.40
|
|
|
CHF 11.20
|
|
|
CHF 10.58
|
|
|
Anzeigen
|
|
|
CHF 10.29
|
|
|
CHF 10.04
|
|
|
CHF 9.97
|
|
|
Kostenvoranschlag
|
|
Min.: 1
Mult.: 1
|
|
|
Buck-Boost
|
1 Output
|
400 kHz
|
80 %
|
|
1.3 V to 80 V
|
15 A
|
- 40 C
|
+ 125 C
|
SMD/SMT
|
QFN-40
|
|
Tube
|
|
|
|
Schaltregler 80V Synch 4-Switch Buck-Boost DC/DC Cont
- LT8708EUHG#PBF
- Analog Devices
-
1:
CHF 14.24
-
63Auf Lager
-
89Auf Bestellung
|
Mouser-Teilenr.
584-LT8708EUHGPB
|
Analog Devices
|
Schaltregler 80V Synch 4-Switch Buck-Boost DC/DC Cont
|
|
63Auf Lager
89Auf Bestellung
|
|
|
CHF 14.24
|
|
|
CHF 11.32
|
|
|
CHF 10.21
|
|
|
CHF 9.65
|
|
|
Anzeigen
|
|
|
CHF 9.37
|
|
|
CHF 9.15
|
|
Min.: 1
Mult.: 1
|
|
|
Buck-Boost
|
1 Output
|
400 kHz
|
80 %
|
|
1.3 V to 80 V
|
15 A
|
- 40 C
|
+ 125 C
|
SMD/SMT
|
QFN-40
|
|
Tube
|
|
Liechtenstein