tm
March 2008
FFA40UP35S
©2008 Fairchild Semiconductor Corporation
FFA40UP35S Rev. A www.fairchildsemi.com1
Ultrafast Rectifier
FFA40UP35S
Features
• High Speed Switching, trr < 55ns @ IF = 40A
• High Reverse Voltage and High Reliability
• Avalanche Energy Rated
• Low Forward Voltage, VF < 1.6V
• RoHS compliant
Applications
• General Purpose
• Switching Mode Power Supply
• Free-wheeling diode for motor application
• Power switching circuits
40A, 350V Ultrafast Rectifier
The FFA40UP35S is utrafast rectifier with low forward voltage
drop. It is silicon nitride passivated ion-implanted epitaxial planar
construction.
This device is intended for use as freewheeling/clamping rectifi-
ers in a variety of switching power supplies and other power
swithching applications. Its low stored charg e and hyperfast soft
recovery minimize ringing and electrical noise in many power
switching circuits reducing power loss in the switching transis-
tors.
Absolute Maximum Ratings TC = 25oC unless otherwise noted
Thermal Characteristics
Package Marking and Ordering Information
Symbol Parameter Ratings Units
VRRM Peak Repetitive Reverse Voltage 350 V
VRWM Working Peak Reverse Voltage 350 V
VRDC Blocking Voltage 350 V
IF(AV) Average Rectified Forward Current @ TC = 111oC 40 A
IFSM Non-repetitive Peak Surge Current
60Hz Single Half-Sine Wave 400 A
TJ, TSTG Operating and Storage Temperature Range -65 to +150 oC
Symbol Parameter Ratings Units
RθJC Maximum Thermal Resistance, Junction to Case 0.8 oC/W
Device Marking Device Package Reel Size Tape Width Quantity
F40UP35S FFA40UP35STU TO3P - - 30
TO3P
1. Anode 2. Cathode 3. Anode
1
2
3
1. Anode 2. Cathode 3. Anode
FFA40UP35S
FFA40UP35S Rev. A www.fairchildsemi.com2
Electrical Characteristics TC = 25oC unless otherwise noted
Symbol Parameter Min. Typ. Max. Units
VFM1IF = 40A
IF = 40A TC = 25oC
TC = 125oC-
--
-1.6
1.5 V
IRM1VR = 350V
VR = 350V TC = 25oC
TC = 125oC-
--
-100
500 µA
trr IF = 1A, di/dt = 100A/µs, VR = 30V
IF = 40A, di/dt = 200A/µs, VR = 230V TC = 25oC-
-26
28 53
55 ns
ta
tb
Qrr
IF = 40A, di/dt = 200A/µs, VR = 230V TC = 25oC-
-
-
17
11
36
-
-
-
ns
ns
nC
WAVL Avalanche Energy ( L = 40mH) 20 - - mJ
Test Circuit and Waveforms
Notes:
1: Pulse: Test Pulse width = 300µs, Duty Cycle = 2%
FFA40UP35S
FFA40UP35S Rev. A www.fairchildsemi.com
3
Typical Performance Characteristics
Figure 1. Typical Forward Voltage Drop
vs. Forward Current Figure 2. Typical Reverse Current vs.
Reverse Voltage
Figure 3.Typical Junction Capacitance Figure 4. Typical Reverse Recovery Time
vs. di/dt
Figure 5. Typical Reverse Recovery
Current vs. di/dt Figure 6. Forward Current Derating Curve
0.0 0.5 1.0 1.5 2.0
0.2
1
10
100
TC = 125oC
TC = 75oC
Forward Current, IF [A]
Forward Voltage, VF [V ]
TC = 25oC
100 200 300 350
1E-3
0.01
0.1
1
10
100
TC = 75oC
TC = 25oC
TC = 125oC
Reverse Cur rent , IR [µA]
Reverse Voltage, VR [V]
10
0.1 1 10 100
80
160
240
320
400
480
560 Typical Capac itance
at 0V = 530 pF
Capacitances , Cj [pF]
Rev e rse V olta ge, V R [V] 100 200 300 400 500
20
30
40
50 IF = 40A
TC = 75oC
TC = 25oC
TC = 125oC
Reverse Recovery Time, trr [µs]
di/dt [A/µs]
100 200 300 400 500
2
4
6
8
10
IF = 40A
TC = 125oC
TC = 25oC
TC = 75oC
Reverse Recovery Current, Irr [A]
di/dt [A/µs]25 50 75 100 125 150
0
25
50
75
100
Average Forward Current, IF(AV) [A]
Case temperature, TC [oC]
FFA40UP35S
FFA40UP35S Rev. A www.fairchildsemi.com
4
Mechanical Dimensions
TO3P
Dimensions in Millimeters
FFA40UP35S
FFA40UP35S Rev. A www.fairchildsemi.com5
Rev. I32
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The following are registered and unregistered trademarks and service marks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.
* EZSWITCH™ and FlashWriter® are trademarks of System General Corporation, used under license by Fairchild Semiconductor.
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT NOTICE TO ANY PRODUCTS HEREIN TO
IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE
APPLICATION OR USE OF AN Y PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOE S IT CONVEY ANY LICENSE UNDER
ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S
WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems which,
(a) are intended for surgical implant into the body, or (b)
support or sustain life, and (c) whose failure to perform when
properly used in accordance with instructions for use provided
in the labeling, can be reasonably expected to result in
significant injury to the user.
2. A critical component is any component of a life support device
or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Term s
ACEx®
Build it Now™
CorePLUS™
CROSSVOLT™
CTL™
Current Transfer Logic™
EcoSPARK®
EZSWITCH™ *
™
Fairchild®
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MICROCOUPLER™
MicroFET™
MicroPak™
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OPTOLOGIC®
OPTOPLANAR®
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PDP-SPM™
Power220®
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POWEREDGE®
Power-SPM™
PowerTrench®
Programmable Active Droop™
QFET®
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Quiet Series™
RapidConfigure™
SMART START™
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STEALTH™
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SuperSOT™-3
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SyncFET™®
The Power Franchise®
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tm
®
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Datasheet Identification Product Status Definition
Advance Information Formative or In Design This datasheet contains the design specifications for product development.
Specifications may change in any manner without notice.
Preliminary First Production This datasheet contains preliminary data; supplementary data will be pub-
lished at a later date. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve design.
No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves
the right to make changes at any time without notice to improve design.
Obsolete Not In Production This datasheet contains specifications on a product that has been discontin-
ued by Fairchild semiconductor. The datasheet is printed for reference infor-
mation only.
