22 COREY STREET, MELROSE, MASSACHUSETTS 02176
PHONE (781) 665-1071
FAX (781) 665-7379
WEBSITE: http://www.cdi-diodes.com
E-mail: mail@cdi-diodes.com
ELECTRICAL CHARACTERISTICS @ 25C, unless otherwise specified
MINIMUM
MINIMUM
DYNAMIC
KNEE
MAXIMUM
TYPE
REGULATOR CURRENT
IMPEDANCE
IMPEDANCE
LIMITING
PEAK
NUMBER l p (mA) @ VS = 25V
@VS = 25V
@VK = 6.0 V
VOLTAGE
OPERATING
(Note 1)
ZS (K
)
ZK(K
)
@ lL = 0.8 l p (min)
VOLTAGE
NOM
MIN
MAX
(Note 2)
(Note 3)
VL (VOLTS)
VOLTS
CDLL250
5.10
4.59
5.61
100
4.0
3.67
80
CDLL251
5.60
5.04
6.16
90
4.0
4.03
80
CDLL252
6.20
5.58
6.82
80
3.0
4.46
70
CDLL253
6.80
6.12
7.48
70
2.0
4.90
70
CDLL254
7.50
6.75
8.25
50
1.5
5.40
60
CDLL255
8.20
7.38
9.02
30
1.5
5.90
60
CDLL256
9.10
8.19
10.01
20
1.0
6.55
50
CDLL257
10.00
9.00
11.10
10
1.0
7.20
50
NOTE 1
Pulse measurement @ 1% duty cycle, 10 milliseconds maximum.
NOTE 2
ZS is derived by superimposing A 90Hz RMS signal equal to 10% of VS on VS
NOTE 3
ZK is derived by superimposing A 90Hz RMS signal equal to 10% of VK on VK
MAXIMUM RATINGS
Operating Temperature: -65C to +175C
Storage Temperature: -65C to +175C
DC Power Dissipation: 500 mW @ +50C
Power Derating: 4 mW / C above +50C
CURRENT REGULATOR DIODES
LEADLESS PACKAGE FOR SURFACE MOUNT
CONSTANT CURRENT OVER WIDE VOLTAGE RANGE
HIGH SOURCE IMPEDANCE
METALLURGICALLY BONDED
FIGURE 1
DESIGN DATA
CASE: DO-213AB, Hermetically sealed
glass case. (MELF, LL41)
LEAD FINISH: Tin / Lead
THERMAL RESISTANCE: (ROJEC):
100 C/W maximum at L = 0 inch
THERMAL IMPEDANCE: (ZOJX): 25
C/W maximum
POLARITY: Diode to be operated with
the band (cathode) end negative.
MOUNTING SURFACE SELECTION:
The Axial Coefficient of Expansion
(COE) Of this Device is Approximately
+6PPM/C. The COE of the Mounting
Surface System Should Be Selected To
Provide A Suitable Match With This
Device.
CDLL250
thru
CDLL257
MILLIMETERS INCHES
DIM
MIN
MAX
MIN
MAX
D
2.39
2.66
.094
.105
F
0.41
0.55
.016
.022
G
4.80
5.20
.189
.205
G1
4.11 REF.
.159 REF.
S
0.03 MIN.
.001 MIN.
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