CDIDI DCR257, DCR256, DCR255, DCR254, DCR253 Datasheet

22 COREY STREET, MELROSE, MASSACHUSETTS 02176
PHONE [phone] FAX [phone]
WEBSITE: http://www.cdi-diodes.com E-mail: [e-mail]

• CURRENT REGULATOR DIODES

• CONSTANT CURRENT OVER WIDE VOLTAGE RANGE

• HIGH SOURCE IMPEDANCE

• METALLURGICALLY BONDED

• DOUBLE PLUG CONSTRUCTION

DCR250

thru

DCR257

FIGURE 1

DESIGN DATA

CASE: Hermetically sealed glass case.

DO-7 outline.

LEAD MATERIAL: Copper clad steel.

LEAD FINISH: Tin / Lead

THERMAL RESISTANCE: (R

O

JEC

):

250 ˚C/W maximum at L = .375 inch
THERMAL IMPEDANCE: (Z

OJX

): 25

˚C/W maximum

POLARITY: Diode to be operated with
the banded (cathode) end negative.

MOUNTING POSITION: Any

ELECTRICAL CHARACTERISTICS @ 25°C, 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(KΩ)Z

K

(KΩ)@ lL= 0.8 l p (min) VOLTAGE

NOM MIN MAX (Note 2) (Note 3) VL(VOLTS) VOLTS

DCR250 5.10 4.59 5.61 100 4.0 3.67 80
DCR251 5.60 5.04 6.16 90 4.0 4.03 80
DCR252 6.20 5.58 6.82 80 3.0 4.46 70
DCR253 6.80 6.12 7.48 70 2.0 4.90 70

DCR254 7.50 6.75 8.25 50 1.5 5.40 60
DCR255 8.20 7.38 9.02 30 1.5 5.90 60
DCR256 9.10 8.19 10.01 20 1.0 6.55 50
DCR257 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 VSon V

S

NOTE 3 ZKis derived by superimposing A 90Hz RMS signal equal to 10% of VKon V

K

MAXIMUM RATINGS

Operating Temperature: -65°C to +175°C
Storage Temperature: -65°C to +175°C
DC Power Dissipation: 500 mW @ +50°C @ T

L= 3/8”

Power Derating: 4 mW / °C above +50°C