2. Schottky Rectifier

Surface Mount Devices

Part Number

Package

IO

VRRM

VF

BAT54WS

SOD-323

100mA

30V

0.24~1.00V

SD107WS

SOD-323

100mA

30V

0.30~0.80V

SD103AWS/BWS/CWS

SOD-323

0.35A

20V~40V

0.37~0.60V

B0520WS~B0540WS

SOD-323

0.5A

20V~40V

0.385V~0.510V

B5817WS~B5819WS 

SOD-323

1.0A

20V~40V

0.45V~0.60V

BAT42W~BAT43W

SOD-123

0.2A

30V

0.40~1.00V

DSS12~DSS110

SOD-123FL

1.0A

20V~100V

0.55V~0.85V

DSS22~DSS210

SOD-123FL

2.0A

20V~100V

0.55V~0.85V

DSS32~DSS310

SOD-123FL

3.0A

20V~100V

0.55V~0.85V

B0520W~B0540W

SOD-123

0.5A

20V~40V

0.385V~0.510V

B5817W~B5819W

SOD-123

1.0A

20V~40V

0.45V~0.60V

FM102~FM110

SOD-123

1.0A

20V~100V

0.50V~0.85V

FM202~FM210

SOD-123

2.0A

20V~100V

0.50V~0.85V

LM5817~LM5819

DO-213AA

1.0A

20V~40V

0.45V~0.90V

BAS40 series

SOT-23

0.2A

40V

0.38~1.00V

BAT54 series

SOT-23

0.2A

30V

0.24V~1.00V

SM5817~SM5819 

MELF (DO-213AB)

1.0A

20V~40V

0.45V~0.60V

S12~S120

SMA (DO-214AC)

1.0A

20V~200V

0.45V~0.95V

S22~S220

SMA (DO-214AC)

2.0A

20V~200V

0.55V~0.95V

S32~S320

SMA (DO-214AC)

3.0A

20V~200V

0.55V~0.95V

MBRA340

SMA (DO-214AC)

3.0A

40V

0.55V

S55L~S56L

SMA (DO-214AC)

5.0A

50V~60V

0.55V

SB22~SB220

SMB (DO-214AA)

2.0A

20V~200V

0.55V~0.95V

SB32~SB320

SMB (DO-214AA)

3.0A

20V~200V

0.55V~0.95V

SB52~SB520

SMB (DO-214AA)

5.0A

20V~200V

0.55V~0.95V

SS32~SS320 

SMC (DO-214AB)

3.0A

20V~200V

0.55V~0.95V

SS52~SS520 

SMC (DO-214AB)

5.0A

20V~200V

0.55V~0.95V

SS62~SS620 

SMC (DO-214AB)

6.0A

20V~200V

0.55V~0.90V

SS82~SS810 

SMC (DO-214AB)

8.0A

20V~100V

0.55V~0.85V

SS102~SS1010

SMC (DO-214AB)

10.0A

20V~100V

0.65V~0.85V

SDF22S~SDF210S

DFS

2.0A

20V~100V

0.55V~0.85V

ABS32~ABS310

ABS

3.0A

20V~100V

0.55V~0.85V

Lead Devices

Part Number

Package

Io

VRRM

VF

1N5817~1N5819

DO-41

1.0A

20V~40V

0.45V~0.60V

1N5820~1N5822

DO-201AD

3.0A

20V~40V

0.475V~0.525V

SR120~SR1200

DO-41

1.0A

20V~200V

0.55V~0.85V

SK220~SK2200

DO-41

2.0A

20V~200V

0.55V~0.85V

SR220~SR2200

DO-15

2.0A

20V~200V

0.55V~0.85V

SK320~SK3200

DO-15

3.0A

20V~200V

0.55V~0.95V

SR320~SR3200

DO-201AD

3.0A

20V~200V

0.55V~0.95V

SR520~SR5200

DO-201AD

5.0A

20V~200V

0.55V~0.85V

SR620~SR6200

DO-201AD

6.0A

20V~200V

0.55V~0.90V

SR820~SR8100

DO-201AD

8.0A

20V~100V

0.65V~0.85V

MBR20200(F)

TO-220AB/ITO220AB

20.0A

200V

0.72~0.92V

MBR2040~MBR2050

TO-220AB/ITO220AB

20.0A

40~50V

0.65~0.69V

Introduction to Schottky Rectifier :

Schottky rectifiers have been used for over 25 years in the power supply industry. The primary advantages are very low forward voltage drop and switching speeds that approach zero time making them ideal for output stages of switching power supplies. This latter feature has also stimulated their additional use in very high frequency applications including very low power involving signal and switching diode requirements of less than 100 picoseconds. These require small Schottky devices with low capacitance.

The reverse recovery time of Schottky diodes are extremely fast (but soft) recovery characteristics. What little reverse recovery time they may exhibit is primarily dictated by their capacitance rather than minority carrier recombination as in conventional pn junction rectifiers. This characteristic provides very little reverse current overshoot when switching the Schottky from the forward conducting mode to the reverse blocking state. The combination of very "fast soft switching properties" of a Schottky can also eliminate the need for snubber circuits in many applications that may otherwise be required with fast or ultrafast rectifiers displaying abrupt recovery characteristics. These features make schottky rectifiers a very attractive choice for low parasitic switching losses.

Design considerations with Schottky devices are limited in some applications compared to pn junction rectifiers because their reverse leakage currents are many times higher. Also Schottky rectifiers have maximum rated junction temperature typically in the range of 125 oC to 175 oC, compared to the typical 200 oC for conventional pn junctions which further influences leakage current behavior.

For some applications, Schottky devices are limited in available reverse blocking voltage ratings compared to conventional pn junction rectifiers. Nevertheless with judicious selection, many applications are optimized with Schottky rectifiers and their unique operating characteristics. Schottky rectifiers seldom exceed 100 volts in their working peak reverse voltage (VRRM), since devices moderately above this rating level will result in forward voltages equal to or greater than equivalent pn junction rectifiers.