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PFR 850S 856S
FAST RECOVERY RECTIFIER DIODES
PRELIMINARY DATASHEET
LOW FORWARD VOLTAGE DROP
HIGH SURGE CURRENT CAPABILITY
APPLICATIONS
AC-DC POWER SUPPLIES AND CONVER-
TERS
FREE WHEELING DIODES, etc.
DESCRIPTION
Their high efficiency and high reliability combined
with small size and low cost make these fast reco-
very rectifier diodes very attractive components for
many demanding applications.
DO-201AD
(Plastic)
ABSOLUTE MAXIMUM RATINGS (limiting values)
Symbol
Parameter
IFRM
IF (AV)
Repetitive Peak Forward Current
Average Forward Current*
tp 20µs
Ta = 90°C
δ = 0.5
IFSM Surge non Repetitive Forward Current
tp = 10ms
Sinusoidal
Ptot Power Dissipation*
Ta = 90°C
Tstg Storage and Junction Temperature Range
Tj
TL
Maximum Lead Temperature for Soldering during 10s at 4mm from
case
Value
100
3
100
3.5
- 40 to + 175
- 40 to + 175
230
Unit
A
A
A
W
°C
°C
Symbol
Parameter
VRRM
VRSM
Repetitive Peak Reverse Voltage
Non Repetitive Peak Reverse Voltage
850S
50
75
851S
100
150
PFR
852S
200
250
854S
400
450
856S
600
650
Unit
V
V
THERMAL RESISTANCE
Symbol
Rth (j - a)
Junction-ambient*
* On infinite heatsink with 10mm lead length.
August 1996 - Ed: 1
Parameter
Value
25
Unit
°C/W
1/3

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PFR 850S 856S
ELECTRICAL CHARACTERISTICS
STATIC CHARACTERISTICS
Synbol
IR
VF
Tj = 25°C
Tj = 100°C
Tj = 25°C
Test Conditions
VR = VRRM
IF = 3A
Min.
Typ.
Max.
10
250
1.25
Unit
µA
V
RECOVERY CHARACTERISTICS
Symbol
Test Conditions
trr Tj = 25°C
VR= 30V
IRM Tj = 25°C
VR= 30V
IF = 1A
PRF 850S 854S
diF/dt = - 25A/µs PRF 856S
IF = 1A
diF/dt = - 25A/µs
Min.
Typ.
Max.
150
200
2
Unit
ns
A
2/3

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PACKAGE MECHANICAL DATA
DO-201AD
B
A
B
note 1 E
E note 1
PFR 850S 856S
ØC
ØD
note 2
ØD
REF.
DIMENSIONS
NOTES
Millimeters
Inches
Min. Max. Min. Max.
A 9.50 0.374
B 25.40
1.000
C
5.30
0.209 1 - The lead diameter D is not controlled over zone E
D 1.30 0.051 2 - The minimum axial lengh within which the device may be
E 1.25 0.049 placed with its leads bent at right angles is 0.59"(15 mm)
Weight : 1 g
Marking : Type number
White band indicates cathode
cooling method : by convertion (method A)
Date code
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
© 1996 SGS-THOMSON Microelectronics - Printed in Italy - All rights reserved.
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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