Vishay 18TQ0..PbF Series Data Sheet

TO-220AC

Schottky Rectifier, 18 A

FEATURES

• 175 °C TJ operation

• Low forward voltage drop

• High frequency operation

• High purity, high temperature epoxy
encapsulation for enhanced mechanical strength and
moisture resistance

• Guard ring for enhanced ruggedness and long term
reliability

• Compliant to RoHS directive 2002/95/EC

• Designed and qualified for industrial level

cathode

1

Cathode

Base

2

3

Anode

18TQ0..PbF Series

Vishay High Power Products

PRODUCT SUMMARY

I

F(AV)

V

R

18 A

35 V to 50 V

DESCRIPTION

The 18TQ...PbF Schottky rectifier series has been optimized
for low reverse leakage at high temperature. The proprietary
barrier technology allows for reliable operation up to 175 °C
junction temperature. Typical applications are in switching
power supplies, converters, freewheeling diodes, and
reverse battery protection.

MAJOR RATINGS AND CHARACTERISTICS

SYMBOL CHARACTERISTICS VALUES UNITS

I

F(AV)

V

I

FSM

V

T

RRM

F

J

Rectangular waveform 18 A

Range 35 to 50 V

tp = 5 μs sine 1800 A

18 Apk, TJ = 125 °C 0.53 V

Range - 55 to 175 °C

VOLTAGE RATINGS

PARAMETER SYMBOL 18TQ035PbF 18TQ040PbF 18TQ045PbF 18TQ050PbF UNITS

Maximum DC reverse voltage V

Maximum working peak reverse voltage V

R

RWM

35 40 45 50 V

ABSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL TEST CONDITIONS VALUES UNITS

Maximum average forward current
See fig. 5

Maximum peak one cycle
non-repetitive surge current
See fig. 7

Non-repetitive avalanche energy E

Repetitive avalanche current I

I

F(AV)

I

FSM

AR

50 % duty cycle at TC = 149 °C, rectangular waveform 18

5 μs sine or 3 μs rect. pulse

10 ms sine or 6 ms rect. pulse 390

TJ = 25 °C, IAS = 3.6 A, L = 3.7 mH 24 mJ

AS

Current decaying linearly to zero in 1 μs
Frequency limited by T

maximum VA = 1.5 x VR typical

J

Following any rated load
condition and with rated
V

applied

RRM

1800

3.6 A

A

* Pb containing terminations are not RoHS compliant, exemptions may apply

Document Number: 94149 For technical questions, contact: [e-mail]
Revision: 10-Nov-09 1

www.vishay.com

18TQ0..PbF Series

Vishay High Power Products

Schottky Rectifier, 18 A

ELECTRICAL SPECIFICATIONS

PARAMETER SYMBOL TEST CONDITIONS VALUES UNITS

18 A

Maximum forward voltage drop

See fig. 1

V

FM

36 A 0.72

(1)

18 A

36 A 0.67

Maximum reverse leakage current
See fig. 2

I

RM

Maximum junction capacitance C

Typical series inductance L

T

S

TJ = 25 °C

(1)

T

= 125 °C 25

J

VR = 5 VDC (test signal range 100 kHz to 1 MHz) 25 °C 1400 pF

Measured lead to lead 5 mm from package body 8 nH

Maximum voltage rate of change dV/dt Rated V

T

= 25 °C

J

= 125 °C

T

J

V

= Rated V

R

R

R

0.60

0.53

2.5

10 000 V/μs

Note

(1)

Pulse width < 300 μs, duty cycle < 2 %

THERMAL - MECHANICAL SPECIFICATIONS

PARAMETER SYMBOL TEST CONDITIONS VALUES UNITS

Maximum junction and storage
temperature range

Maximum thermal resistance,
junction to case

Typical thermal resistance,
case to heatsink

Approximate weight

Mounting torque

minimum 6 (5)

maximum 12 (10)

Marking device Case style TO-220AC

, T

T

J

Stg

R

thJC

R

thCS

DC operation
See fig. 4

Mounting surface, smooth and greased 0.50

- 55 to 175 °C

1.50

2g

0.07 oz.

kgf · cm

(lbf 〈 in)

18TQ035

18TQ040

18TQ045

18TQ050

V

mA

°C/W

www.vishay.com For technical questions, contact: [e-mail]

Document Number: 94149

2 Revision: 10-Nov-09

18TQ0..PbF Series

1000

100

10

Current (A)

1

- Instantaneous Forward

F

I

0.1
0

VFM - Forward Voltage Drop (V)

= 175 °C

T

J

T

= 125 °C

J

TJ = 25 °C

Schottky Rectifier, 18 A

- Reverse Current (mA)

R

I

1.6

1.40.2 0.4 0.6 0.8 1.0 1.2

Vishay High Power Products

1000

100

10

1

0.1

0.01

0.001

0.0001
010 304020 50

TJ = 75 °C

TJ = 50 °C

TJ = 25 °C

VR - Reverse Voltage (V)

TJ = 175 °C

TJ = 150 °C

TJ = 125 °C

TJ = 100 °C

Fig. 1 - Maximum Forward Voltage Drop Characteristics Fig. 2 - Typical Values of Reverse Current vs.

Reverse Voltage

10 000

1000

- Junction Capacitance (pF)

T

C

100

01020 4030 50

VR - Reverse Voltage (V)

Fig. 3 - Typical Junction Capacitance vs. Reverse Voltage

10

1

P

0.1

0.01

- Thermal Impedance (°C/W)

thJC

Z

0.001

0.00001 0.0001 0.001 0.01 0.1 1 10 100

Single pulse

(thermal resistance)

D = 0.50
D = 0.33
D = 0.25
D = 0.17
D = 0.08

Notes:

1. Duty factor D = t

2. Peak TJ = PDM x Z

DM

t

1

1/t2

thJC

t1 - Rectangular Pulse Duration (s)

Fig. 4 - Maximum Thermal Impedance Z

Characteristics

thJC

t

2

.

+ T

C

.

Document Number: 94149 For technical questions, contact: [e-mail]

www.vishay.com

Revision: 10-Nov-09 3