LL4148 — Small Signal Diode
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
LL4148 Rev. B2 1
June 2011
LL4148
Small Signal Diode
Absolute Maximum Ratings * Ta = 25°C unless otherwise noted
* These ratings are limiting value s ab ove which the serviceability of the diode may be impaired .
Notes:
1) These ratings are based on a maximum junction temperature of 200degrees C.
2) These are steady state limits. The factory should be consulted on applications involving pulsed or low duty cycle
operations.
Thermal Characteristics
Note: Jedec Standard 51-3 method ( PCB Board size 76 *114*0.6Tmm3 )
Electrical Characteristics Ta = 25°C unless otherwise noted.
Package Marking and Ordering Information
Symbol Parameter Value Units
VRRM Maximum Repetitive Reverse Voltage 100 V
IF(AV) Average Rectified Forward Current 200 mA
ifRecurrent Peak Forward Current 500 mA
IFSM Non-repetitive Peak Forward Surge Current
Pulse Width = 1.0 second
Pulse Width = 1.0 microsecond 1.0
2.0 A
A
TSTG Storage Temperature Range -65 to +200 °C
TJOperating Junction Temperature Range -55 to +175 °C
Symbol Parameter Value Units
PDPower Dissipation 500 mW
RθJA Thermal Resistance, Junction to Ambient 300 °C/W
Symbol Parameter Conditions Min. Max. Units
VRBreakdown Voltage IR = 100μA
IR = 5.0μA100
75 V
V
VFForward Voltage IF = 10mA 1.0 V
IRReverse Leakage VR = 20V
VR = 20V, TA = 150°C25
50 nA
μA
CTTotal Capacitance VR = 0, f = 1.0MHz 4.0 pF
trr Reverse Recovery Time IF = 10mA, VR = 6.0V (60mA),
Irr = 1.0mA, RL = 100Ω
4.0 ns
Device Marking Device Package Reel Size Tape Width Quantity
Color Band Marking LL4148 SOD80 7” 8mm 2,500
COLOR BAND MARKING
1ST BAND 2ND BAND
Black Green
SOD80 The 1st Band indicates the cathode band
LL4148 — Small Signal Diode
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
LL4148 Rev. B2 2
Typical Performance Characteristics
Figure 1. Reverse Voltage vs Reverse Current
BV - 1.0 to 100μAFigure 2. Reverse Voltage vs Reverse Current
IR - 10 to 100V
Figure 3. For ward Voltage vs Forward Cur rent
VF - 1 to 100μAFigure 4. Forward Voltage vs Forward Current
VF - 0.1 to 10mA
Figure 5. For ward Voltage vs Forward Cur rent
VF - 10 to 800mA Figure 6. Forward Voltage vs
Ambient Temperature
VF - 0.01 - 20mA (-40 to +65 Deg C)
110
120
130
140
150
160 Ta=25 oC
1 2 3 5 1 0 2 0 3 0 5 0 10 0
Reverse V o ltage, V R [V ]
Reverse C urren t, IR [uA]
VR
0
20
40
60
80
100
120
10 20 3 0 5 0 70 1 00
Ta= 25 oC
Reverse Current, I R [nA ]
Reverse Voltage, VR [V ]
Reverse Voltage, VR [V]
IR
250
300
350
400
450
500
550
1 2 3 5 1 0 20 30 50 1 00
Ta= 25 oC
Forward Voltage, V R [mV]
Forward Curre n t, IF [uA]
VF
450
500
550
600
650
700
750
0.1 0.2 0.3 0.5 1 2 3 5 10
Ta= 25 oC
Forward Voltage, V F [m V ]
Forward C u rr en t, IF [mA]
VF
0.6
0.8
1.0
1.2
1.4
1.6
10 20 30 50 100 200 300 500 800
Ta= 25 oC
Forward Voltage, V F [m V ]
Forward Current, IF [mA]
[
VF
0.01 0.1 1 10
300
400
500
600
700
800
900
3
0.3
0.03
Typical
Ta= -40 oC
Ta= 25 oC
Ta= +65 oC
Forward Voltage, V F [m V ]
Forward Curren t, IF [mA]
VF
LL4148 — Small Signal Diode
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
LL4148 Rev. B2 3
Typical Performance Characteristics (Continued)
Figure 7. Total Capacitance Figure 8. Reverse Recovery Time vs
Reverse Recovery Current
Figure 9. Average Rectified Current (IF(AV))
versus Ambient Temperature (TA)Figure 10. Power Derating Curve
02468101214
0.75
0.80
0.85
0.90
TA = 25 oC
Total Capacitance (pF)
REVERSE VO LTAGE (V)
Total Capacitance (pF)
10 20 30 40 50 60
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Ta = 25 oC
Reverse Recovery Time, t rr [ns]
Reverse Recovery Current, Irr [mA ]
Ta = 25°C
trr
0 50 100 150
0
100
200
300
400
500
I
F(AV)
- AVERAGE RECTIFIED CURRENT - mA
Cu rre n t (mA)
Ambient Temperature ( oC)
0 50 100 150 200
0
100
200
300
400
500
DO-35
SOT-23
Po wer D i ss ipatio n , PD [mW]
Temperature [ oC]
SOD80
LL4148 — Small Signal Diode
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
LL4148 Rev. B2 4
Physical Dimensions
SOD80
Dimensions in Millimeters
© Fairchild Semiconductor Corporation www.fairchildsemi.com
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The datasheet is for reference information only. Rev. I54
