T4-LDS-0218-1, Rev. 2 (11/07/14)(111513) ©2014 Microsemi Corporation Page 1 of 5
1N6638US, 1N6642US, 1N6643US
Available on
commercial
versions
VOIDLESS HERMETICALLY SEALED
SWITCHING DIODES
Qualified per MIL-PRF-19500/578
Qualified Levels:
JAN, JANTX,
JANTXV and JANS
DESCRIPTION
This popular surface mount equivalent JEDEC registered switching/signal diodes are military
qualified and available with internal metallurgical bonded construction. These small low
capacitance diodes with very fast switching speeds are hermetically sealed and bonded into a
“D-5D” package. They may be used in a variety of fast switching applications including
computers and peripheral equipment such as magnetic cores, thin-film memories, plated-wire
memories, as well as decoding or encoding applications, etc. Microsemi also offers a variety
of other switching/signal diodes. “D” SQ-MELF
(D-5D) Package
Also available in:
“D” Package
(axial-leaded)
1N6638_42_43
Important: For the latest information, visit our website http://www.microsemi.com.
FEATURES
JEDEC registered surface mount equivalents of 1N6638, 1N6642, and 1N6643.
Ultra fast recovery time.
Very low capacitance.
Metallurgically bonded.
Non-cavity glass package.
JAN, JANTX, JANTXV and JANS qualifications are available per MIL-PRF-19500/578.
Replacements for 1N4148UR, 1N4148UR-1, 1N4150UR-1, and 1N914UR.
RoHS compliant devices available (commercial grade only).
APPLICATIONS / BENEFITS
Small size for high density mounting (see package illustration).
Ideal for:
High frequency data lines
RS-232 & RS–422 Interface Networks
Ethernet: 10 Base T
Switching core drivers
LAN
Computers
MAXIMUM RATINGS @ TA = +25 oC unless otherwise noted.
MSC – Lawrence
6 Lake Street,
Lawrence, MA 01841
1-800-446-1158
Tel: (978) 620-2600
Fax: (978) 689-0803
MSC – Ireland
Gort Road Business Park,
Ennis, Co. Clare, Ireland
Tel: +353 (0) 65 6840044
Fax: +353 (0) 65 6822298
Website:
www.microsemi.com
Parameters/Test Conditions Symbol Value Unit
Junction and Storage Temp TJ and TSTG -65 to +175 oC
Thermal Resistance Junction-to-End Cap RӨJEC 40
oC/W
Thermal Resistance Junction-to-Ambient (1) R
ӨJA 250
oC/W
Peak Forward Surge Current @ TA = +25 oC
(Test pulse = 8.3 ms, half-sine wave.)
IFSM 2.5 A
Average Rectified Forward Current @ TA = +75 oC
(Derate at 4.6 mA/°C Above TEC = + 110 °C)
IO 300 mA
Breakdown Voltage: 1N6638US
1N6642US
1N6643US
VBR 150
100
75
V
Working Peak Reverse Voltage: 1N6638US
1N6642US
1N6643US
VRWM 125
75
50
V
NOTES: 1. TA = +75 °C on printed circuit board (PCB), PCB = FR4 - .0625 inch (1.59 mm) 1-layer 1-Oz Cu,
horizontal, in still air; pads for US = .061 inch (1.55 mm) x .105 inch (2.67 mm); RΘJA with a defined PCB
thermal resistance condition included, is measured at IO = 300 mA.
T4-LDS-0218-1, Rev. 2 (11/07/14)(111513) ©2014 Microsemi Corporation Page 2 of 5
1N6638US, 1N6642US, 1N6643US
MECHANICAL and PACKAGING
CASE: Voidless hermetically sealed hard glass.
TERMINALS: Tin-Lead plate with >3% Lead. Solder dip is available upon request.
MARKING: Body painted and alpha numeric.
POLARITY: Cathode indicated by band.
Tape & Reel option: Standard per EIA-481-1-A with 12 mm tape. Consult factory for quantities.
See Package Dimensions on last page.
PART NOMENCLATU RE
JAN 1N6638 US (e3)
Reliability Level
JAN = JAN Level
JANTX = JANTX Level
JANTXV = JANTXV Level
JANS = JANS Level
Blank = commercial
JEDEC type number
See Electrical Characteristics
table
RoHS Compliance
e3 = RoHS compliant (available
on commercial grade only)
Blank = non-RoHS compliant
Surface Mount Package
SYMBOLS & DEFINITIONS
Symbol Definition
VBR Minimum Breakdown Voltage: The minimum voltage the device will exhibit at a specified current.
VRWM Working Peak Reverse Voltage: The maximum peak voltage that can be applied over the operating temperature
range.
VF Maximum Forward Voltage: The maximum forward voltage the device will exhibit at a specified current.
IR Maximum Reverse Current: The maximum reverse (leakage) current that will flow at the specified voltage and
temperature.
C Capacitance: The capacitance in pF at a frequency of 1 MHz and specified voltage.
trr
Reverse Recovery Time: The time interval between the instant the current passes through zero when changing from
the forward direction to the reverse direction and a specified recovery decay point after a peak reverse current is
reached.
ELECTRICAL CHARACTERISTICS @ 25oC unless otherwise noted.
TYPE
NUMBER
MAXIMUM
FORWARD
VOLTAGE
VF @ IF
MAXIMUM DC REVERSE CURRENT
IR1 IR2 IR3 IR4
REVERSE
RECOVERY
TIME
trr
(Note 1)
MAXIMUM
FORWARD
RECOVERY
VOLTAGE AND
TIME
IF=200mA, tr=1ns
MAXIMUM
JUNCTION
CAPACITANCE
f = 1 MHz
Vsig = 50 mV
(p-p)
VR=
20 V VR=VRWM V
R=20 V
TA=
+150 oC
VR=VRWM
TA=
+150 oC VFRM t
fr VR=0 V VR=1.5 V
V @ mA V @ mA nA nA
A
A ns V ns pf pf
1N6638US 0.8 V @ 10 mA 1.1 V @ 200 mA 35 500 50 100 4.5 5.0 20 2.5 2.0
1N6642US 0.8 V @ 10 mA 1.2 V @ 100 mA 25 500 50 100 5.0 5.0 20 5.0 2.8
1N6643US 0.8 V @ 10 mA 1.2 V @ 100 mA 50 500 75 100 6.0 5.0 20 5.0 2.8
NOTE: 1. Reverse Recovery Time Test Conditions – IF=IR=10 mA, IR(REC) = 1.0 mA, C=3 pF, RL = 100 ohms.
T4-LDS-0218-1, Rev. 2 (11/07/14)(111513) ©2014 Microsemi Corporation Page 3 of 5
1N6638US, 1N6642US, 1N6643US
GRAPHS
TA (oC) Ambient Temperature
FIGURE 1
Temperature – Current Derating
Time (s)
FIGURE 2
Maximum Thermal Impedance at TA = 55 oC
Sinewave Operation Maximum IO Rating (mA)
Thermal Im
p
edance
(
oC/W
)
T4-L
D
D
S-0218-1, Re
Thermal Im
p
edance
(
oC/W
)
v. 2 (11/07/14
)
)
(111513)
Maxi
m
©2014 Mic
GRAP
H
F
m
um Therm
a
rosemi Corpor
1
N
H
S (continu
e
Time (s)
F
IGURE 3
a
l Impedance
r
ation
N
6638U
S
e
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at T
EC
= 25
o
C
S
, 1N66
4
C
4
2US, 1
N
Page 4 of 5
N
6643U
S
S
T4-LDS-0218-1, Rev. 2 (11/07/14)(111513) ©2014 Microsemi Corporation Page 5 of 5
1N6638US, 1N6642US, 1N6643US
PACKAGE DIMENSIONS
D-5D
NOTES:
1. Dimensions are in inches. Millimeters are given for general information only.
2. Dimensions are pre-solder dip.
3. U-suffix parts are structurally identical to the US-suffix parts.
4. In accordance with ASME Y14.5M, diameters are equivalent to Φx symbology.
DIM
INCH MILLIMETERS
MIN MAX MIN MAX
BD 0.070 0.085 1.78 2.16
ECT 0.019 0.028 0.48 0.71
BL 0.165 0.195 4.19 4.95
S 0.003 MIN. 0.08 MIN.
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Microsemi:
JANS1N6638U JANTX1N6643U JAN1N6638U JANTXV1N6638U JANTX1N6638US JAN1N6643US 1N6643U
JANS1N6642U JANS1N6643U 1N6638U JANTXV1N6643US JAN1N6642US 1N6638US JANTX1N6638U
JANTXV1N6638US JANTX1N6642US JANTX1N6642U JANTXV1N6642U 1N6643US JAN1N6638US
JANTXV1N6642US JAN1N6643U 1N6642US 1N6642USe3 1N6638US/TR 1N6642US/TR
