CHENMKO ENTERPRISE CO.,LTD
SURFACE MOUNT GLASS PASSIVATED
SUPER FAST SILICON RECTIFIER
VOLTAGE RANGE 50 - 1000 Volts CURRENT 2.0 Amperes
FEATURES
For surface mounted applications
Low profile package
Built-in strain relief
Superfast recovery times for high efficiency
Metallurgically bonded construction
Plastic package has Underwriters Laboratory
Flammability Classification 94V-0
* Glass passivated junction
* High temperature soldering guaranteed :
260
o
C/10 seconds at terminals
*
*
*
*
*
*
USM21PT
THRU
USM28PT
SMA
0.110(2.80)
0.094(2.40)
(1)
0.065(1.65)
0.049(1.25)
0.181(4.60)
0.165(4.20)
0.012(0.310)
0.006(0.150)
(2)
MECHANICAL DATA
Case:
JEDEC SMA molded plastic
Terminals:
Solder plated, solderable per MIL-STD-750,
Method 2026
Polarity:
Indicated by cathode band
Weight:
0.002 ounces, 0.064 gram
0.090(2.30)
0.075(1.90)
0.060(1.52)
0.030(0.76)
0.008 (0.203)(max)
0.212(5.40)
0.189(4.80)
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Ratings at 25 C ambient temperature unless otherwise specified.
Single phase, half wave, 60 H
Z
, resistive or inductive load.
For capacitive load, derate current by 20%.
o
Dimensions in inches and (millimeters)
SMA
UNITS
Volts
Volts
Volts
Amps
MAXIMUM RATINGES
( At T
A
= 25
o
C unless otherwise noted )
RATINGS
Maximum Recurrent Peak Reverse Voltage
Maximum RMS Voltage
Maximum DC Blocking Voltage
Maximum Average Forward Rectified Current T
L
= 100
o
C
Peak Forward Surge Current 8.3 ms single half sine-wave
I
FSM
superimposed on rated load (JEDEC method)
Typical Junction Capacitance (Note 1)
Operating and Storage Temperature Range
C
J
T
J
, T
STG
30
-65 to +150
20
pF
o
SYMBOL
V
RRM
V
RMS
V
DC
I
O
USM21PT USM22PT USM23PT USM24PT USM25PT USM26PT USM27PT USM28PT
50
35
50
100
70
100
200
140
200
300
210
300
2.0
400
280
400
600
420
600
800
560
800
1000
700
1000
50
Amps
C
ELECTRICAL CHARACTERISTICS
( At T
A
= 25
o
C unless otherwise noted )
CHARACTERISTICS
Maximum Instantaneous Forward Voltage at 2.0 A DC
Maximum DC Reverse Current
at Rated DC Blocking Voltage
Maximum Reverse Recovery Time (Note 2)
@ T
A
= 25 C
@ T
A
= 100 C
trr
35
o
o
SYMBOL
V
F
I
R
USM21PT USM22PT USM23PT USM24PT USM25PT USM26PT USM27PT USM28PT
UNITS
Volts
uAmps
uAmps
0.95
5.0
100
1.27
1.75
45
nSec
RATING CHARACTERISTIC CURVES ( USM21PT THRU USM28PT )
FIG. 1 - TEST CIRCUIT DIAGRAM AND REVERSE RECOVERY TIME CHARACTERISTIC
50
NONINDUCTIVE
10
NONINDUCTIVE
trr
+0.5A
(-)
0
PULSE
GENERATOR
(NOTE 2)
1
NON-
INDUCTIVE
OSCILLOSCOPE
(NOTE 1)
(+)
-1.0A
NOTES: 1. Rise Time = 7 ns max. Input Impedance =
1 megohm. 22 pF.
2. Rise Time = 10 ns max. Source Impedlance=
50 ohms.
1cm
SET TIME BASE FOR
10 nS/cm
-0.25A
AVERAGE FORWARD CURRENT, ( A )
FIG. 2 - TYPICAL FORWARD
CURRENT DERATING CURVE
2.0
(+)
25 Vdc
(approx)
(-)
D.U.T
1.0
Single Phase
Half Wave 60Hz
Resistive or
Inductive Load
0
0
25 50 75 100 125 150 175
LEAD TEMPERATURE (
O
C )
FIG. 3 - TYPICAL REVERSE CHARACTERISTICS
100
INSTANTANEOUS FORWARD CURRENT, ( A )
INSTANTANEOUS REVERSE CURRENT, (uA)
10
FIG. 4 - TYPICAL INSTANTANEOUS FORWARD
CHARACTERISTICS
PT
SM
24
PT
M2
1
US
T
J
=75
o
C
1.0
0.1
US
M
26
.1
T
J
=25
o
C
T
J
=25 C
.01
.01
0
20
40
60
80
100
120
140
PERCENT OF RATED PEAK REVERSE VOLTAGE, ( % )
.001
0
.2
.4
.6
.8
1.0
1.2 1.4
1.6
INSTANTANEOUS FORWARD VOLTAGE, ( V )
1.8
FIG. 5 - MAXIMUM NON-REPETITIVE FORWARD SURGE CURRENT
PEAK FORWARD SURGE CURRENT, ( A )
70
JUNCTION CAPACITANCE, ( pF )
60
50
40
30
20
10
0
1
2
5
10
20
NUMBER OF CYCLES AT 60 Hz
50
100
8.3ms Single Half Sine-Wave
(JEDEC Method)
FIG. 6 - TYPICAL JUNCTION CAPACITANCE
200
100
60
40
20
10
6
4
2
1
.1
.2
.4
1.0
2
4
10
20
REVERSE VOLTAGE, ( V )
40
100
T
J
=25
o
C
USM
21PT
~USM
25PT
USM2
6PT~
USM2
8PT
PT
~
o
10
1.0
US
US
T
J
=100
o
C
Pulse Width = 300uS
1% Duty Cycle
~U
M2
5
PT
M
28
PT
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