PLED Open LED Protectors
PLED Unidirectional Series
PLED Unidirectional Series (PLEDxUx)
Description
The PLED Unidirectional Series (PLEDxUx Series) open
LED protectors provide an electronic switching shunt path
around a single LED that fails as an open circuit. This
ensures the remaining string of LEDs will continue to
function even though a single LED in the string has failed
open. It also provides reverse battery or reverse power
polarity protection.
The PLED Unidirectional Series components were
designed to enable higher reliability in outdoor LED lighting
applications such as street lighting, outdoor signage,
aircraft runway lighting, roadside warning lights and other
applications.
Agency Approvals
Agency
Agency File Number
E133083
Compatible with one, two and three watt LEDs that have
a nominal 3V forward characteristic, PLED Unidirectional
Series components are available in two different surface
mount packages, the DO-214AA and the Quad Flat Pak No-
lead (QFN). The QFN’s low profile, chip scale package (CSP)
is ideal for dense board applications.
Features & Benefits
Schematic Symbol
MT
2
• Fast switching
• Reverse Battery/Power
Protection
• Automatically resets after
power cycle
MT1
Cathode
(bar marking side)
• Compatible with industrial
lighting environments
• Compatible with PWM
frequencies up to 10 kHz
• RoHS compliant and
halogen-free
Control
Circuit
• Available in low profile,
small footprint QFN
and Standard DO214AA
packages
Electrical Characteristics
(All parameters are measured at T=25°C unless otherwise noted)
V
DRM
V
BR
breakdown breakdown
Part Number
Marking
Volts
Min
PLED6UQ12
PLED6US
PLED9UQ12
PLED9US
PLED13UQ12
PLED13US
PLED18UQ12
PLED18US
PLED35US*
PL6U
PL6U
PL9U
PL9U
PL13U
PL13U
PL18U
PL18U
PL35U
6
6
9
9
13
13
18
18
35
Max
16
16
18
18
26
26
33
33
50
Volts
Min
6
6
9
9
13
13
18
18
35
I
H
I
S
I
T
@V
T
V
T
@ I
F
= 1 A
Volts
Max
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
I
F
@V
F
Amps
Max
1.0
1.0
2.0
1.0
1.0
1.0
1.0
1.0
1.0
V
T
@ I
F
= 1 A
Volts
Max
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
250V/µs
Critical rate of
rise dV/dt
Volts
Max
mAmps mAmps Amps
Max
30
30
30
30
30
30
30
30
30
Max
50
50
50
50
50
50
50
50
50
Max
1.0
1.0
2.0
1.0
1.0
1.0
1.0
1.0
1.0
Note:
1. IO- Operation current tested @ alumium boards, ambient temp 85C
2. Part with “*” is not a UL Recognized component.
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/27/18
PLED Open LED Protectors
PLED Unidirectional Series
Thermal Considerations
Package
Symbol
T
J
QFN 3x3
Parameter
Operating Junction Temperature Range
Storage Temperature Range
Thermal Resistance: Junction to Ambient
Value
-40 to +150
-65 to +150
DO-214AA: 90
1
DO-214AA: 40
2
QFN: 120
1
QFN: 60
3
Unit
°C
°C
°C/W
DO-214AA
T
S
R
θ
JA
Notes:
1) Standard FR-4 PCB with Copper Pads (Recommended Size)
2) Aluminum PCB
Thickness: 1.6mm
Grade: 1-2 W/mK Thermal Conductivity
Trace thickness: 2 oz
Insulation layer thickness: 215 µm
Solder Pad Dimensions:
2.0mm x 2.8mm (Recommended Size)
3) Aluminum PCB
Thickness: 1.6mm
Grade: 1-2 W/mK Thermal Conductivity
Trace thickness: 2 oz
Insulation layer thickness: 60 µm
Solder Pad Dimensions:
1.27mm x 2.54mm (Recommended Size)
V-I Characteristics
+I
V
BR
vs. Junction Temperature
14
I
T
I
S
I
H
V
F
P e rc e n t o f V
BR
C h a n g e – %
12
10
8
6
4
2
0
-4
-6
-8
-40 -20
0
20
40
60
80
100 120 140 160
-V
V
T
V
DRM
V
BR
I
T
-I
+V
25 ˚C
Junction Temperature (T
J
) – ˚C
Normalized DC Holding Current vs. Case Temperature
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
-40 -20
0
20
40 60
80 100 120 140 160
LED Interference Test Circuit
Q1
i
H
(T
C
= 2 5 ˚C )
2.0
110 k
, 1/4 W
LED
Driver
i
H
, 1/4 W
25 ˚C
+
-
V
bat
12 Vdc
PWM
Q2
2N2222
R a tio o f
MT
2
Control
Circuit
ON/OFF
Switch
Unidiretional
PLED
MT1
Case Temperature (T
C
) – ˚C
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/27/18
PLED Open LED Protectors
PLED Unidirectional Series
6 LEDs in Series 50% Duty Cycle 10kHz
5 LEDs and 1 PLED in Series 50% Duty Cycle 10kHz
Note: These two graphs show the current magnitude through the LED string with and without the PLED included. There is no noticeable effect on the LED current magnitude when the
PLED is included in the circuit as compared to the LED current magnitude when the PLED is not in the circuit. (The conversion factor for the test measurement in the graphs above is
10mA/mV for the Pearson coil measurement, therefore, the current magnitude in the first figure is 10mA*8.9 = 89mA, while the second figure is 91mA.)
PLED in the Off-State 10kHz
PLED device zeners and then turns fully on 10kHz
Channel 1: current through LEDs (318 mA)
Channel 2: voltage across PLED device (4.5 V)
Channel 1: current through LEDs (346 mA) and PLED device once it is fully turned on 2.5 μsec later
Channel 2: voltage across PLED device (21.3 V before PLED crowbars with 2 V drop)
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/27/18
PLED Open LED Protectors
PLED Unidirectional Series
Soldering Parameters
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (min to max) (t
s
)
Average ramp up rate (Liquidus Temp
(T
L
) to peak
T
S(max)
to T
L
- Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Temperature (t
L
)
Pb – Free assembly
150°C
200°C
60 – 180 secs
3°C/second max
3°C/second max
217°C
60 – 150 seconds
260
+0/-5
°C
30 seconds
6°C/second max
8 minutes max
260°C
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
Environmental Specifications
High Temperature
Voltage Blocking
Temperature Cycling
Biased Temperature &
Humidity
High Temperature
Storage
Low Temperature
Storage
Thermal Shock
Resistance to
Solder Heat
MIL
-STD-750: Method 1040, Condition A
80% min V
DRM
(VAC-peak), 150°C,
504 hours
MIL
-STD-750: Method 1051
-65°C to 150°C, 15-minute dwell,
100 cycles
EIA/JEDEC: JESD22-A101
52VDC, 85°C, 85%RH, 1008 hours
MIL
-STD-750: Method 1031
150°C, 1008 hours
-65°C, 1008 hours
MIL
-STD-750: Method 1056
0°C to 100°C, 5-minute dwell,
10-second transfer, 10 cycles
MIL
-STD-750: Method 2031
260°C, 10 seconds
Physical Specifications
Terminal Material
Terminal Finish
Body Material
Copper Alloy
100% Matte Tin Plated
UL Recognized compound meeting
flammability rating V-0.
Part Numbering System
Part Marking System
DO-214AA
PLED
x
U
x x
TYPE
I
T
DO-214AA
PLxU
XXXXX
PLxU
XXXXX
Cathode Bar
Cathode Bar
PLED: LED Protector
Blank:1A
002: 2A
PACKAGE TYPE
V
DRM
6 Volts
9 Volts
13 Volts
18 Volts
35 Volts
Q12: 3.0x3.0mm QFN
S: DO-214AA
Unidirectional
QFN
QFN
PLxU
XXXXX
PLxU
XXXXX
Cathode Bar
Cathode Bar
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/27/18
PLED Open LED Protectors
PLED Unidirectional Series
Packaging
Package
Q12
S
Description
QFN 3x3
D O - 2 1 4 AA
Packaging Quantity
5000
2500
Industry Standard
EIA-481-1
EIA-481-1
Dimensions - QFN (3x3) Package
TOP VIEW
A
E
BOTTOM VIEW
C
J
Dimensions
A
Inches
Min
0.114
0.114
0.075
0.011
0.076
0.035
0.000
0.004
0.004
0.056
0.038
0.096
0.082
Typ
0.118
0.118
0.079
0.015
0.080
0.039
0.004
0.008
0.008
0.060
0.042
0.100
0.086
Max
0.122
0.122
0.083
0.019
0.084
0.043
0.008
0.012
0.012
0.064
0.046
0.104
0.090
Min
2.900
2.900
1.900
0.285
1.930
0.900
0.000
0.100
0.100
1.143
0.970
2.440
2.080
Millimeters
Typ
3.000
3.000
2.000
0.385
2.030
1.000
0.100
0.200
0.200
1.530
1.070
2.540
2.180
Max
3.100
3.100
2.100
0.485
2.130
1.100
0.200
0.300
0.300
1.630
1.170
2.640
2.280
B
F
B
C
END VIEW
H
K1
SIDE VIEW
K2
E
F
H
J
N2
N1
M2
M1
M2
M1
1.27mm
0.050”
1.50mm
0.059”
K1
K2
M1
M2
2.54mm
0.100”
Recommended solder pad layout
(Reference Only)
N1
N2
Dimensions - DO-214 AA Package
B
D
CASE TEMPERATURE
MEASURING POINT
Dimensions
A
Inches
Min
0.130
0.201
0.077
0.159
0.030
0.075
0.002
0.077
0.006
Max
0.156
0.220
0.087
0.181
0.063
0.096
0.008
0.104
0.016
Millimeters
Min
3.30
5.10
1.95
4.05
0.75
1.90
0.05
1.95
0.15
Max
3.95
5.60
2.20
4.60
1.60
2.45
0.20
2.65
0.41
C
A
B
C
D
K
H
F
E
F
G
E
G
H
K
0.079"
(2.0mm)
0.110"
(2.8mm)
0.079"
(2.0mm)
Recommended solder pad layout
(Reference Only)
© 2018 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 03/27/18
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