SCHOTTKY RECTIFIER 120 Amp
121NQ...(R) SERIES
Bulletin PD-2.249 rev. D 05/05
1www.irf.com
Major Ratings and Characteristics Description/ Features
The 121NQ... (R) high current Schottky rectifier module
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,
free-wheeling diodes, and reverse battery protection.
175° C TJ operation
Unique high power, Half-Pak module
Replaces two parallel DO-5's
Easier to mount and lower profile than DO-5's
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
IF(AV) Rectangular 120 A
waveform
VRRM range 35 / 50 V
IFSM @ tp = 5 µs sine 19,800 A
VF@ 120Apk, TJ=125°C 0.56 V
TJrange - 55 to 175 °C
Characteristics Values Units
Case Styles
121NQ...(R)
D-67
IF(AV) = 120 A
VR = 35/ 50V
121NQ...(R) Series
Bulletin PD-2.249 rev. D 05/05
2www.irf.com
TJMax. Junction Temperature Range -55 to 175 °C
Tstg Max. Storage Temperature Range -55 to 175 °C
RthJC Max. Thermal Resistance Junction 0.40 °C/W DC operation * See Fig. 4
to Case
RthCS Typical Thermal Resistance, Case to 0.15 °C/W Mounting surface , smooth and greased
Heatsink
wt Approximate Weight 25.6 (0.9) g (oz.)
T Mounting Torque Min. 40 (35) Non-lubricated threads
Max. 58 (50)
Terminal Torque Min. 58 (50)
Max. 86 (75)
Case Style HALF PAK Module
Thermal-Mechanical Specifications
Parameters 121NQ Units Conditions
Kg-cm
(Ibf-in)
VFM Max. Forward Voltage Drop (1) 0.65 V @ 120A
* See Fig. 1 0.83 V @ 240A
0.56 V @ 120A
0.70 V @ 240A
IRM Max. Reverse Leakage Current (1) 10 mA TJ = 25 °C
* See Fig. 2 90 mA TJ = 125 °C
CTMax. Junction Capacitance 5200 pF VR = 5VDC, (test signal range 100Khz to 1Mhz) 25 °C
LSTypical Series Inductance 7.0 nH From top of terminal hole to mounting plane
dv/dt Max. Voltage Rate of Change 10000 V/ µs
(Rated VR)
TJ = 25 °C
TJ = 125 °C
VR = rated VR
Parameters 121NQ Units Conditions
(1) Pulse Width < 300µs, Duty Cycle < 2%
Electrical Specifications
IF(AV) Max. Average Forward Current 120 A 50% duty cycle @ TC = 133° C, rectangular wave form
* See Fig. 5
IFSM Max. Peak One Cycle Non-Repetitive 19,800 5µs Sine or 3µs Rect. pulse
Surge Current * See Fig. 7 2200 10ms Sine or 6ms Rect. pulse
EAS Non-Repetitive Avalanche Energy 81 mJ TJ
= 25 °C, IAS
= 12 Amps, L = 1.12 mH
IAR Repetitive Avalanche Current 12 A Current decaying linearly to zero in 1 µsec
Frequency limited by TJ max. VA = 1.5 x VR typical
Parameters 121NQ Units Conditions
Absolute Maximum Ratings
A
Part number 121NQ035 121NQ040 121NQ045 121NQ050
VRMax. DC Reverse Voltage (V)
VRWM Max. Working Peak Reverse Voltage (V) 35 40 45 50
Voltage Ratings
Following any rated
load condition and
with rated VRRM applied
121NQ...(R) Series
Bulletin PD-2.249 rev. D 05/05
3www.irf.com
Fig. 2 - Typical Values of Reverse Current
Vs. Reverse Voltage
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage
Fig. 4 - Maximum Thermal Impedance ZthJC Characteristics
.001
.01
.1
1
10
100
1000
0 5 10 15 20 25 30 35 40 4
5
R
R
T = 175°C
150°C
125°C
100°C
75°C
50°C
25°C
J
Reverse Voltage - V (V)
Reverse Current - I (mA)
1000
10000
0 1020304050
T = 25°C
J
Reverse Voltage - V (V)
R
T
Junction Capacitance - C (pF)
.001
.01
.1
1
.00001 .0001 .001 .01 .1 1 10 100
D = 0. 33
D = 0. 50
D = 0. 25
D = 0.17
D = 0. 08
1
thJC
t , Rectangular Pulse Duration (Seconds)
Thermal Impedance - Z (°C/W)
Single Pulse
(Thermal Resistance)
2
t
1
t
P
DM
Notes:
1. Duty factor D = t / t
2. Peak T = P x Z + T
1
JDMthJC C
2
Fig. 1 - Maximum Forward Voltage Drop Characteristics
1
10
100
1000
0 .1.2.3.4.5.6.7.8.9 11.11.2
FM
F
Instantaneous Forward Current - I (A)
T = 175°C
T = 125°C
T = 25°C
J
J
J
Forward Vol tage Drop - V (V)
121NQ...(R) Series
Bulletin PD-2.249 rev. D 05/05
4www.irf.com
Fig. 8 - Unclamped Inductive Test Circuit
Fig. 5 - Maximum Allowable Case Temperature
Vs. Average Forward Current
Fig. 6 - Forward Power Loss Characteristics
Fig. 7 - Maximum Non-Repetitive Surge Current
0
20
40
60
80
100
0 20 40 60 80 100 120 140 160 180
DC
Average Power Loss - (Watts)
F(AV)
D = 0.08
D = 0.17
D = 0.25
D = 0.33
D = 0.50
RMS Li mit
Average Forward Current - I (A)
120
130
140
150
160
170
180
0 40 80 120 160 200
DC
Allowable Case Temperature - (°C)
Average Forward Current - I (A)
F(AV)
121NQ
R (DC) = 0.40°C/W
thJC
FREE- W HEEL
DIODE
40HFL40S02
C URREN T
MONITOR
HIG H- SPEED
SW I TC H
IRFP460
L
DUT
Rg = 25 ohm Vd = 25 Volt
+
1000
10000
100000
10 100 1000 10000
FSM
p
Non-Repetitive Surge Current - I (A)
At Any Rated Load Condition
And With Rated V Applied
Following Surge
RRM
Square Wave Pulse Duration - t (microsec)
121NQ...(R) Series
Bulletin PD-2.249 rev. D 05/05
5www.irf.com
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7309
Visit us at www.irf.com for sales contact information. 05/05
Data and specifications subject to change without notice.
This product has been designed and qualified for Industrial Level.
Qualification Standards can be found on IR's Web site.
Outline D-67 HALF PAK Module
Dimensions in millimeters and (inches)
Outline Table
