NCR320Z / NCR321Z
250 mA LED driver in SOT223
Rev. 1 — 4 February 2019
Product data sheet
1. Product profile
1.1. General description
LED driver consisting of a resistor-equipped NPN transistor with two diodes on one chip in a
medium power SOT223 (SC-73) Surface-Mounted Device (SMD) plastic package.
Table 1. Product overview
Type number
Package
Nexperia
NCR320Z
NCR321Z
SOT223
SOT223
JEITA
SC-73
SC-73
1.2. Features and benefits
•
•
•
•
•
•
•
•
•
Stabilized output current of 10 mA without external resistor
Stabilized output current adjustable up to 250 mA when an external resistor is used
High current accuracy at supply voltage variation
Low voltage overhead of 1.4 V
Reduces component count and board space
High power dissipation of 1250 mW
Supply voltage up to 16 V
Digital PWM input up to 10 kHz frequency for NCR321Z
AEC-Q101 qualified
1.3. Applications
•
•
•
•
Constant current LED driver
Generic constant current source
Automotive applications (for example: interior lighting, dash board, instrumentation, number
plate light)
Increase stabilized output current by paralleling drivers
Nexperia
NCR320Z / NCR321Z
250 mA LED driver in SOT223
1.4. Quick reference data
Table 2. Quick reference data
Symbol
Parameter
V
EN
enable voltage
NCR320Z
NCR321Z
V
out
I
out
output voltage
stabilized output current
NCR320Z
NCR321Z
[1]
Pulse test: t
p
≤ 300 µs; δ ≤ 0.02
Conditions
Min
-
-
-
Typ
-
-
-
10
10
Max
25
4.5
16
11
11
Unit
V
V
V
mA
mA
V
out
= 1.4 V;
V
EN
= 12 V
V
out
= 1.4 V;
V
EN
= 3.3 V
[1]
9
[1]
9
2. Pinning information
Table 3. Pinning
Pin
Symbol
1
2
3
4
VEN
REXT
GND
IOUT
Description
enable voltage
external resistor
ground
output current
1
2
3
Simplified outline
4
Symbol
IOUT
VEN
REXT
aaa-029430
GND
3. Ordering information
Table 4. Ordering information
Type number Package
Name
NCR320Z
NCR321Z
SC-73
SC-73
Description
plastic surface-mounted package with
increased heatsink; 4 leads
plastic surface-mounted package with
increased heatsink; 4 leads
Version
SOT223
SOT223
4. Marking
Table 5. Marking codes
Type number
NCR320Z
NCR321Z
Marking code
CR320Z
CR321Z
NCR320Z_NCR321Z
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 1 — 4 February 2019
2 / 18
Nexperia
NCR320Z / NCR321Z
250 mA LED driver in SOT223
5. Limiting values
Table 6. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
I
out
V
EN
Parameter
stabilized output current if
external resistor is used
enable voltage
NCR320Z
NCR321Z
V
out
V
R
P
tot
output voltage
reverse voltage
total power dissipation
T
amb
≤ 25 °C
-
-
-
[1]
-
[2]
-
[3]
-
[4]
-
[5]
-
T
j
T
amb
T
stg
[1]
[2]
[3]
[4]
[5]
Conditions
Min
-
Max
300
Unit
mA
25
4.5
16
0.5
765
1160
1250
1800
150
150
150
V
V
V
V
mW
mW
mW
mW
°C
°C
°C
junction temperature
ambient temperature
storage temperature
-
-55
-65
Between all terminals.
Device mounted on an FR4 Printed-Circuit Board (PCB), single-side copper (70 µm), tin-plated and
standard footprint.
Device mounted on an FR4 Printed-Circuit Board (PCB), single-side copper (70 µm), tin-plated; mounting
2
pad for collector 1 cm .
Device mounted on an FR4 Printed-Circuit Board (PCB), 4-layer copper, tin-plated and standard footprint.
Device mounted on an FR4 Printed-Circuit Board (PCB), 4-layer copper, tin-plated; mounting pad for
2
collector 1 cm .
2.0
P
tot
(W)
1.6
(1)
aaa.029431
1.2
(2)
(3)
0.8
(4)
0.4
0
-75
-25
25
2
75
125
175
T
amb
(°C)
(1) FR4 PCB, 4-layer copper, 1 cm
(2) FR4 PCB, 4-layer copper, standard footprint
2
(3) FR4 PCB, single sided copper (70 µm), 1 cm
(4) FR4 PCB, single-sided copper (70 µm), standard footprint
Fig. 1.
Power derating curve
NCR320Z_NCR321Z
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 1 — 4 February 2019
3 / 18
Nexperia
NCR320Z / NCR321Z
250 mA LED driver in SOT223
6. Thermal characteristics
Table 7. Thermal characteristics
Symbol Parameter
R
th(j-a)
thermal resistance from
junction to ambient
Conditions
in free air
Min
[1]
-
[2]
-
[3]
-
[4]
-
R
th(j-sp)
[1]
[2]
[3]
[4]
10
3
Z
th(j-a)
(K/W)
10
2
Typ
-
-
-
-
-
Max
164
108
100
70
27
Unit
K/W
K/W
K/W
K/W
K/W
thermal resistance from
junction to solder point
-
Device mounted on an FR4 PCB, single-sided copper (70 µm), tin-plated and standard footprint.
Device mounted on an FR4 PCB, single-sided copper (70 µm), tin-plated; mounting pad
2
for collector 1 cm .
Device mounted on an FR4 PCB, 4-layer copper, tin-plated and standard footprint.
2
Device mounted on an FR4 PCB, 4-layer copper, tin-plated; mounting pad for collector 1 cm .
aaa-029432
duty cycle = 1
0.75
0.50
0.20
0.10
0.33
10
0.05
0.02
0.01
0
1
10
-5
10
-4
10
-3
10
-2
10
-1
1
10
10
2
t
p
(s)
10
3
FR4 PCB; single-sided copper; tin-plated and standard footprint
Fig. 2.
Transient thermal impedance from junction to ambient as a function of pulse duration; typical values
10
3
Z
th(j-a)
(K/W)
10
2
duty cycle = 1
0.75
0.50
0.33
0.20
10
0.05
0.02
0.01
aaa-029433
0.10
0
1
10
-5
10
-4
10
-3
10
-2
10
-1
1
2
10
10
2
t
p
(s)
10
3
FR4 PCB; single-sided copper, tin-plated; mounting pad for collector 1 cm
Fig. 3.
Transient thermal impedance from junction to ambient as a function of pulse duration; typical values
NCR320Z_NCR321Z
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 1 — 4 February 2019
4 / 18
Nexperia
NCR320Z / NCR321Z
250 mA LED driver in SOT223
aaa-029434
10
3
Z
th(j-a)
(K/W)
10
2
duty cycle = 1
0.75
0.50
0.33
0.20
10
0.05
0.01
0.10
0.02
0
1
10
-5
10
-4
10
-3
10
-2
10
-1
1
10
10
2
t
p
(s)
10
3
FR4 PCB; 4-layer copper; tin-plated and standard footprint
Fig. 4.
Transient thermal impedance from junction to ambient as a function of pulse duration; typical values
10
3
Z
th(j-a)
(K/W)
10
2
aaa-029435
duty cycle = 1
0.50
0.20
0.10
0.05
0.01
0
0.75
0.33
10
0.02
1
10
-5
10
-4
10
-3
10
-2
10
-1
1
2
10
10
2
t
p
(s)
10
3
FR4 PCB; 4-layer copper, tin-plated; mounting pad for collector 1 cm
Fig. 5.
Transient thermal impedance from junction to ambient as a function of pulse duration; typical values
NCR320Z_NCR321Z
All information provided in this document is subject to legal disclaimers.
©
Nexperia B.V. 2019. All rights reserved
Product data sheet
Rev. 1 — 4 February 2019
5 / 18
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