Document
SDH SERIES CRD_Datasheet
SDH SERIES CRD
DESCRIPTION
SDH series current regulative diode (CRD) is based on Silan’s planar JFET process.
It features low start-up stabilized current supply voltage, stable constant-current characteristics and high forward breakdown voltage for its advanced process and smart design.
SDH series CRD has powerful anti-interference capacity of surge current between the anode and cathode, and no other assistant components are needed in application.
SDH series CRD supplies constant current to an electric circuit and is widely used in the constant-current LED driver, modules in phone circuitry, etc.
It is available in SOD-123, SOT-223-3L and TO-92-3L packages.
FEATURES
∗ Low start-up stabilized current supply voltage ∗ High dynamic impedance ∗ Constant-current range: 1mA-40mA. ∗ Be paralleled for current extension. ∗ Negative temperature coefficient for LED protection under
high temperature
NOMENCLATURE
ORDERING INFORMATION
Part No. SDHXXXSTR SDHXXXHTR SDHXXXBTR
Package SOD-123 SOT-223-3L TO-92-3L
Marking XXXS
SDHXXXH XXXB
Material Pb free Pb free Pb free
Packing Tape&Reel Tape&Reel
AMMO
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1
2011.01.05 Page 1 of 7
SDH SERIES CRD_Datasheet
ABSOLUTE MAXIMUM RATINGS (Unless otherwise specified, Tc=25°C)
Characteristics
Power Dissipation
Chip-To-Ambient Thermal Resistance Maximum Operating Voltage Operating And Storage Junction Temperature
Symbol
PD
RθJA Vmax Tstg
Range
SOD-123
350
TO-92-3L
200
SOT-223-3L
100
300
See the table below
-30~+150
Unit mW mW mW °C/W
V
°C
ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TC=25°C)
Specifica -tion
Constant current rangenote
Test voltage
Ip(mA)
102 10V 0.88~1.32
152 10V 1.28~1.72
202 10V 1.68~2.32
272 10V 2.28~3.10
352 10V 3.00~4.10
452 10V 3.90~5.10
562 10V 5.00~6.50
822 10V 6.56~9.84
103 10V
8~12
123 10V 9.6~14.4
153 10V
12~18
183 10V
16~20
213 10V
18~24
253 10V
22~28
303 10V
27~33
Note: pulse testing for 380μS.
Start saturation currentnote
Vk [ V ]
Ik [ mA ]
1.7 Min.0.8Ip 2.0 Min.0.8Ip 2.3 Min.0.8Ip 2.7 Min.0.8Ip 3.2 Min.0.8Ip 3.7 Min.0.8Ip 4.5 Min.0.8Ip 3.1 Min.0.8Ip 3.5 Min.0.8Ip 3.8 Min.0.8Ip 4.3 Min.0.8Ip 4.6 Min.0.8Ip 5.0 Min.0.8Ip 5.5 Min.0.8Ip 6.0 Min.0.8Ip
Max. voltage – current
ratio IVMAX/Ip max.1.1 max.1.1 max.1.1 max.1.1 max.1.1 max.1.1 max.1.1 max.1.0 max.1.0 max.1.0 max.1.0 max.1.0 max.1.0 max.1.0 max.1.0
Temperature coefficient [%/°C]
Max. voltage Vmax.(V)
-0.10~ -0.37 -0.13~ -0.40 -0.15~ -0.42 -0.18~ -0.45 -0.20~ -0.53 -0.25~ -0.45 -0.25~ -0.53 -0.25~ -0.45 -0.25~ -0.45 -0.25~ -0.45 -0.25~ -0.45 -0.25~ -0.45 -0.25~ -0.45 -0.25~ -0.45 -0.25~ -0.45
100 100 100 100 100 100 100 50 50 50 50 50 45 45 45
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1
2011.01.05 Page 2 of 7
SDH SERIES CRD_Datasheet
TYPICAL CHARACTERISTIC CURVE
Figure 1. V-A characteristics curve
I(mA) Ip
0 VK
V(V) Vmax
Figure 2. Typical forward characteristics curve
40 30 Pulse test 20
10
SDH123S
SDH153S SDH303S SDH822S
SDH352S
SDH452S
SDH272S
SDH202S
1
SDH102S
ID, constant current (mA)
0.1 0.2 0.3 00..157 2 3 5 170 3200 50 17000
Steady-state constant current IP(mA)
Figure 3, Steady-state current & time
15.5
15.0
SDH153S Vak@10V TA=25°C
14.5
14.0 13.5
13.0
12.5 0
5 10 15 20 25 30
Time(S)
Figure 5, Steady-state current & time
33
SDH303H Vak@10V 31 TA=25°C
29
27
25 0
5 10 15 20 25 30
Time(S)
Steady-state constant current(mA)
Steady-state constant current(mA)
0.1
VAK, voltage (VOLTS)
Figure 4, Pulse testing constant current & steady-state constant current
14 SOD-123
13 Vak@10V TA=25°C
12
11
10
9
8
7 7 9 11 13 15 17
Pulse testing constant current (mA)
Figure 6, Pulse testing constant current & steady-state constant current
35
SOT-223
30
Vak@10V TA=25°C
25
20
15
10 10
15 20 25 30
Pulse testing constant current (mA)
35
Steady-state constant current IP(mA)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1
2011.01.05 Page 3 of 7
SDH SERIES CRD_Datasheet
APPLICATION INFORMATION
1. Temperature characteristics of SDH series CRD
Due to SDH series CRD uses the JFET structure and has negative temperature coefficient; more attention should be paid to the test time when the constant current characteristic of CRD is evaluated. If the test time is long, the heat generated will affect the test data.
The SDH series constant current values listed in “ELECTRICAL CHARACTERISTICS” table are tested by pulse mode under the conditions that Vak=10V with 380μS test pulse width. The same test conditions are recommended for customers.
In “TYPICAL CHARACTERISTICS CURVE”, the relation between steady-state constant current and rated current after stabilization is given.
When in real applications, the customers should use proper CRD according the real application environments (ambient temperature, voltage drop on CRD)
2. SDH series CRD used for LED constant-current control
Using .