Vishay 20TQ...PbF Series Data Sheet

TO-220AC

Schottky Rectifier, 20 A

FEATURES

• 150 °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

• Lead (Pb)-free (“PbF” suffix)

• Designed and qualified for industrial level

cathode

1

Cathode

Base

2

3

Anode

20TQ...PbF Series

Vishay High Power Products

Pb-free

Available

RoHS*

COMPLIANT

PRODUCT SUMMARY

I

F(AV)

V

R

20 A

35 to 45 V

DESCRIPTION

The 20TQ...PbF Schottky rectifier series has been optimized
for very low forward voltage drop, with moderate leakage.
The proprietary barrier technology allows for reliable
operation up to 150 °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

RRM

I

FSM

V

F

T

J

Rectangular waveform 20 A

Range 35 to 45 V

tp = 5 µs sine 1800 A

20 Apk, TJ = 125 °C 0.51 V

Range - 55 to 150 °C

VOLTAGE RATINGS

PARAMETER SYMBOL 20TQ035PbF 20TQ040PbF 20TQ045PbF UNITS

Maximum DC reverse voltage V

Maximum working peak reverse voltage V

R

RWM

35 40 45 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

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

Document Number: 94167 For technical questions, contact: [e-mail]
Revision: 05-Jun-08 1

I

F(AV)

I

FSM

AR

AS

50 % duty cycle at TC = 116 °C, rectangular waveform 20

5 µs sine or 3 µs rect. pulse

10 ms sine or 6 ms rect. pulse 400

TJ = 25 °C, IAS = 4 A, L = 3.4 mH 27 mJ

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

4A

www.vishay.com

A

20TQ...PbF Series

Vishay High Power Products

Schottky Rectifier, 20 A

ELECTRICAL SPECIFICATIONS

PARAMETER SYMBOL TEST CONDITIONS VALUES UNITS

20 A

Maximum forward voltage drop

See fig. 1

V

FM

40 A 0.73

(1)

20 A

40 A 0.67

Maximum reverse leakage curent
See fig. 2

I

RM

Maximum junction capacitance C

Typical series inductance L

(1)

T

S

TJ = 25 °C

T

= 125 °C 105

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 8.0 nH

Maximum voltage rate of change dV/dt Rated V

T

= 25 °C

J

= 125 °C

T

J

V

= Rated V

R

R

R

0.57

0.51

2.7

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

DC operation

R

thJC

R

thCS

See fig. 4

Mounting surface, smooth and greased 0.50

- 55 to 150 °C

1.50

2g

0.07 oz.

kgf · cm

(lbf · in)

20TQ035

20TQ040

20TQ045

V

mA

°C/W

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

Document Number: 94167

2 Revision: 05-Jun-08

20TQ...PbF Series

1000

100

10

Current (A)

1

- Instantaneous Forward

F

I

0.1
0

0.2 0.4 1.2 1.6 1.8

0.6 0.8 1.0 1.4

V

- Forward Voltage Drop (V)

FM

TJ = 150 °C
T

= 125 °C

J

T

= 25 °C

J

Schottky Rectifier, 20 A

- Reverse Current (mA)

R

I

Vishay High Power Products

1000

100

10

1

0.1

0.01

0.001

5 15253545

0203040

10

V

TJ = 150 °C

TJ = 125 °C

TJ = 100 °C

TJ = 75 °C

TJ = 50 °C

TJ = 25 °C

- Reverse Voltage (V)

R

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

10 4020 30 50

0

V

R

TJ = 25 °C

- Reverse Voltage (V)

Fig. 3 - Typical Junction Capacitance vs. Reverse Voltage

10

1

P

0.1

D = 0.50

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 = 0.33
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: 94167 For technical questions, contact: [e-mail]

www.vishay.com

Revision: 05-Jun-08 3