BCR405UW6
50 TO 100mA LED CONSTANT CURRENT
REGULATOR IN SOT26 (SC74R)
Description
The BCR405U monolithically integrates a transistor, diodes and
resistors to function as a Constant Current Regulator (CCR) for LED
driving. The device regulates with a preset 50mA nominal that can be
adjusted with external resistor up to 100mA. It is designed for driving
LEDs in strings and will reduce current at increasing temperatures to
self-protect. Operating as a series linear CCR for LED string current
control then it can be used in applications with supply voltages up to
40V.
With no need for additional external components, this CCR is fully
integrated into a SOT26 (SC74R) minimizing PCB area and
component count.
Features
LED Constant Current Regulator Using PNP Emitter-Follower with
Emitter Resistor to Current Limit
I
OUT
= 50mA ± 10% Constant Current (Preset)
I
OUT
Up to 100mA Adjustable with an External Resistor
V
S
– 40V Supply Voltage
P
D
up to 1W in SOT26 (SC74R)
LED Dimming Using PWM up to 25kHz
Negative Temperature Coefficient (NTC) Reduces I
OUT
with
Increasing Temperature
Parallel Devices to Increase Regulated Current
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Qualified to AEC-Q101 Standards for High Reliability
An Automotive-Compliant Part is Available Under Separate
Datasheet (BCR405UW6Q)
Applications
Constant current regulation (CCR) in:
Emergency Lighting
Signage, Advertising, Decorative and Architectural Lighting
Retail Lighting in Fridge, Freezer Case and Vending Machines
Mechanical Data
Case: SOT26 (SC74R)
Case Material: Molded Plastic. “Green” Molding Compound.
UL Flammability Rating 94V-0
Moisture Sensitivity: Level 1 per J-STD-020
Terminals: Finish - Matte Tin Plated Leads. Solderable per
MIL-STD-202, Method 208
e3
Weight: 0.018 grams (Approximate)
SOT26 (SC74R)
VS
GND
OUT
OUT
R
EXT
OUT
VS
Pin Name
VS
OUT
R
EXT
GND
Pin Function
Supply Voltage
Regulated Output Current
External Resistor for
Adjusting Output Current
Power Ground
Top View
Pin-Out
Top View
Internal Device
Schematic
Ordering Information
(Note 4)
Product
BCR405UW6-7
Notes:
Marking
405
Reel Size (inches)
7
Tape Width (mm)
8
Quantity per Reel
3,000
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
4. For packaging details, go to our website at http://www.diodes.com/products/packages.html.
BCR405UW6
Document number: DS38544 Rev. 3 - 2
1 of 13
www.diodes.com
May 2017
© Diodes Incorporated
BCR405UW6
Marking Information
SOT26 (SC74R)
405
405 = Part Marking (See Ordering Information)
YM = Date Code Marking
Y = Year (ex: D = 2016)
M = Month (ex: 9 = September)
Date Code Key
Year
Code
Month
Code
2017
E
Jan
1
Feb
2
2018
F
Mar
3
Apr
4
2019
G
May
5
2020
H
Jun
6
Jul
7
2021
I
Aug
8
Sep
9
2022
J
Oct
O
Nov
N
2023
K
Dec
D
Absolute Maximum Ratings
(Voltage relative to GND, @T
A
= +25°C, unless otherwise specified.)
Characteristic
Supply Voltage
Output Current
Output Voltage
Reverse Voltage Between All Terminals
Symbol
V
S
I
OUT
V
OUT
V
R
Value
40
100
40
0.5
Unit
V
mA
V
V
Thermal Characteristics
Characteristic
Power Dissipation
Thermal Resistance, Junction to Ambient
Thermal Resistance, Junction to Lead
(Note 5)
(Note 6)
(Note 5)
(Note 6)
(Note 7)
Symbol
P
D
R
θJA
R
θJL
T
J
T
J
, T
STG
Value
1,190
912
105
137
50
-55 to +150
-65 to +150
°C
Unit
mW
°C/W
Recommended Operating Junction Temperature Range
Maximum Operating Junction and Storage Temperature Range
ESD Ratings
(Note 8)
Characteristics
Electrostatic Discharge – Human Body Model
Electrostatic Discharge – Machine Model
Notes:
Symbol
ESD HBM
ESD MM
Value
800
300
Unit
V
V
JEDEC Class
1B
B
5. For a device mounted with the OUT leads on 50mm x 50mm 2oz copper that is on a single-sided 1.6mm FR-4 PCB; device is measured under still
air conditions while operating in steady-state.
6. Same as Note 5, except mounted on 15mm x 15mm 1oz copper.
7.
R
θJL
= Thermal resistance from junction to solder-point (at the end of the OUT leads).
8. Refer to JEDEC specification JESD22-A114 and JESD22-A115
.
BCR405UW6
Document number: DS38544 Rev. 3 - 2
2 of 13
www.diodes.com
May 2017
© Diodes Incorporated
BCR405UW6
Electrical Characteristics
Characteristic
Collector-Emitter Breakdown Voltage
GND (Enable) Current
GND (Enable) Current
DC Current Gain
Internal Resistor
Output Current (Nominal)
Voltage Drop (V
REXT
)
(@T
A
= +25°C, unless otherwise specified.)
Symbol
BV
CEO
I
GND
I
GND
h
FE
R
INT
I
OUT
V
DROP
V
SMIN
ΔI
OUT
/I
OUT
ΔI
OUT
/I
OUT
Min
40
340
—
100
13
45
—
—
—
—
Typ
—
420
380
220
16.5
50
0.83
1.4
-0.25
1.5
Max
—
500
—
470
22
55
—
—
—
—
Unit
V
µA
µA
—
Ω
mA
V
V
%/°C
%/V
I
C
= 1mA
V
S
= 10V; V
OUT
= Open
V
S
= 10V; V
OUT
= 8.6V
I
C
= 50mA; V
CE
= 1V
I
RINT
= 50mA
V
OUT
= 8.6V; V
S
= 10V
I
OUT
= 50mA
I
OUT
> 18mA
V
S
= 10V
V
S
= 10V
Test Condition
Lowest Sufficient Supply Voltage (V
S
-V
OUT
)
Output Current Change vs. Temperature
Output Current Change vs. Supply Voltage
BCR405UW6
Document number: DS38544 Rev. 3 - 2
3 of 13
www.diodes.com
May 2017
© Diodes Incorporated
BCR405UW6
Typical Thermal Characteristics
Max Power Dissipation (W)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
50
100
25mm * 25mm
1oz Cu
50mm * 50mm
1oz Cu
(@T
A
= +25°C, unless otherwise specified.)
800
700
Rth(JA) (°C/W)
600
500
400
300
200
100
0
150
100
Temperature (°C)
Copper Area (mm )
2
1000
Derating Curve
Thermal Resistance (°C/W)
125
Rth(JA) VS Cu Area
Maximum Power (W)
T
amb
=25°C
100
75
50
25
50mm * 50mm
1oz Cu
D=0.5
D=0.2
Single Pulse
D=0.05
D=0.1
10
T
amb
=25°C
50mm * 50mm
1oz Cu
Single Pulse
1
0
100µ
1m
10m 100m
1
10
100
1k
100µ
1m
10m 100m
1
10
100
1k
Pulse Width (s)
Pulse Width (s)
Transient Thermal Impedance
Thermal Resistance (°C/W)
150
Pulse Power Dissipation
Maximum Power (W)
125
100
75
50
25
0
100µ
T
amb
=25°C
25mm * 25mm
1oz Cu
D=0.5
10
T
amb
=25°C
25mm * 25mm
1oz Cu
Single Pulse
D=0.2
Single Pulse
D=0.05
D=0.1
1
1m
10m 100m
1
10
100
1k
100µ
1m
10m 100m
1
10
100
1k
Pulse Width (s)
Pulse Width (s)
Transient Thermal Impedance
Pulse Power Dissipation
BCR405UW6
Document number: DS38544 Rev. 3 - 2
4 of 13
www.diodes.com
May 2017
© Diodes Incorporated
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