ER490 / ER491
CURRENT 1.0 Ampere
VOLTAGE 20 to 40 Volts
Case: Molded Plastic
Terminals: Solderable per MIL-STD-202,
Method 208
Polarity: See Diagrams Below
Weight: 0.008 grams (approx.)
Mounting Position: Any
Low Turn-on Voltage
Fast Switching
PN Junction Guard Ring for Transient a
nd
ESD Protection
ER491 Marking : 10T
ER490 Marking : 10F
Dim
Min
Max
A
2.70
3.10
B
1.30
1.70
C
1.00
1.30
D
0.35
0.50
G
1.70
2.30
H
0.00
0.10
J
0.10
0.26
K
0.20
0.60
L
1.25
1.65
S
2.25
3.00
All Dimension in mm
SC-59
S
G
D
B
L
A
1
3
2Top View
H
C
J
K
2
1
3
2
ANODE
3
CATHODE
2
ANODE
3
CATHODE
o
Rating at 25 C ambient temperature unless otherwise specified Single phase, half wave,
60 Hz, resistive or inductive load. For capacitive load, derate current by 20%
Type Number
Maximum Recurrent Peak Reverse Voltage
Maximum RMS Voltage
Maximum DC Blocking Voltage
Maximum Average Forward Rectified Current
Peak Forward Surge Current, 8.3 ms SingleHalf
Sine-wave Superimposed on Rated Loadmethod
(JEDEC)
Maximum lnstantaneous Forward Voltage At 1.0A
o
Maximum D.C. Reverse Current @ T =25 C
A
o
At Rated DC Blocking Voltage @ T =100 C
A
Operating Junction Temperature Range T
J
Storage Temperature Range T
STG
ER491
Units
20
14
20
v
v
v
1.0
5.00
0.45
0.1
4.0
-25+125
-50+125
A
A
V
mA
mA
o
C
o
C
Features
Mechanical Data
Maximum Ratings and Electrical Characteristics
ER490
0.53
40
28
40
RATINGS AND CHARACTERISTIC CURVES ER490 / ER491
FIG.1-TYPICAL FORWARDCHARACTERISTICS
FIG.2-TYPICAL FORWARD CURRENT DERATING CURVE
A
V
E
R
A
G
E
F
O
R
W
A
R
D
C
U
R
R
E
N
T
,
(
A
)
FIG.4-TYPICAL JUNCTION CAPACITANCE
REVERSE VOLTAGE,(V)
J
U
N
C
T
I
O
N
C
A
P
A
C
I
T
A
N
C
E
,
(
p
F
)
I
N
S
T
A
N
T
A
N
E
O
U
S
F
O
R
W
A
R
D
C
U
R
R
E
N
T
,
(
A
)
FORWARD VOLTAGE,(V)
0.2
0.4
0.6
0.8
1.0
1.2
175
150
125
100
25
0.01
.05 .1 .5 1 5 10 50 100
Single Phase
Half Wave 60Hz
Resistive Or Inductive Load
O
AMBIENT TEMPERATURE ( C)
.1
1.0
R
E
V
E
R
S
E
L
E
A
K
A
G
E
C
U
R
R
E
N
T
,
(
m
A
)
10
100
FIG.3 - TYPICAL REVERSECHARACTERISTICS
PERCENTAGE RATED PEAK REVERSE VOLTAGE
0 20 40 60 80 10 0 12 0 14 0
.01
Tj=7 5 C
Tj=2 5 C
0
0 20 40
60 80 100 120 140 160 180 200
75
50
0.1
1.0
.0 1
10
50
.1 .3 .5 .7 .9 1. 1 1 .3 1 .5
3.0
Pulse Width 300us
1% Duty Cycle
Tj=25 C
ER
491
ER
490
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