Revision Date: 2/5/2013 1
Switching Diodes 1N6638 Series
1N6638, 1N6639, 1N6640, 1N6641, 1N6642, 1N6643,
1N6638U & US, 1N6639U & US, 1N6640U & US,
1N6641U & US 1N6642U & US, 1N6643U & US
Maximum Ratings
Operating Temperature: -65°C to +175°C
Storage Temperature: -65°C to +175°C
Operating Current: 300mA
Derating: See Figure 5
Surge Current: IFSM = 2.5A, half sine wave,
PW= 8.3ms
Thermal Resistance:
(RӨJEC): U & US 40 °C/W maximum at L = 0”
See Figure 6
(RӨJL): Leaded 150 °C/W maximum at L = .375”
See Figure 7
Thermal Impedance: (ZӨJX): 25 °C/W maximum
VFR / tfr @C
T1 CT2 trr IR1 IR2 IR3 IR4
VBR @ IRVWRM IF = 200 mA VR=0 V VR=1.5 V IR= 10mA VR=VRWM VR=20V VR=20V VR= VRWM
TYPES IF= 10mA TA= 150°C TA= 150°C
V(pk) μA V(pk) VFR tfr
V(pk) ns pF pF ns nA dc nA dc μA dc μA dc
1N6638, U & US 150 100 125 5.0 20 2.5 2.0 4.5 35 500 50 100
1N6639, U & US 100 10 75 5.0 10 2.5 ‐4.0 ‐100 ‐90
1N6640, U & US 75 10 50 5.0 10 2.5 ‐4.0 ‐100 ‐90
1N6641, U & US 75 10 50 5.0 10 3.0 ‐5.0 ‐100 ‐90
1N6642, U & US 100 100 75 5.0 20 5.0 2.8 5.0 25 500 50 100
1N6643, U & US 75 100 50 5.0 20 5.0 2.8 6.0 50 500 75 100
Electrical Specifications @ TA = + 25 ºC ( Unless Otherwise Specified )
VF@ IFVF2 @ IFIF
TYPES TA= -55°C
V dc V dc V dc mA
(min) (max) (max) (pulsed)
1N6638, U & US ‐1.1 1.2 200
‐0.8 ‐10
1N6639, U & US ‐1.2 1.3 500
1N6640, U & US 0.54 0.62 -1
0.76 0.86 ‐50
0.82 0.92 ‐100
0.87 1.0 1.1 200
1N6641, U & US ‐1.1 1.2 200
1N6642, U & US ‐0.8 ‐10
‐1.2 1.2 100
1N6643, U & US ‐0.8 ‐10
‐1.2 1.4 100
Features
• Available in JAN, JANS, JANTX, JANTXV
per MIL‐PRF‐19500/578 & /609
• Switching Diodes
• Non‐Cavity Glass Plackage
• Category I Metallurgically Bonded
TEL: 603-641-SEMI (7364) • metelics-sales@aeroflex.com • www.aeroflex.com/metelics
Revision Date: 2/5/2013
2
Switching Diodes 1N6638 Series
NOTES:
1. Dimensions are in inches. Millimeters are given for general information only.
2. Dimension BD shall be measured at the largest diameter.
3. The specified lead diameter applies in the zone between .050 inch (1.27 mm)
from the diode body to the end of the lead. Outside of this zone lead shall not exceed BD.
4. In accordance with ASME Y14.5M, diameters are equivalent to Φx symbology.
5. U‐suffix parts are structurally identical to the US‐suffix parts.
Outline Drawing
U & US DESIGN DATA
CASE: D‐5D, Hermetically sealed glass
case, per MIL‐PRF‐19500/578 & /609
LEAD FINISH: Tin/Lead
END CAP MATERIAL (U, US): Copper
POLARITY: Cathode end is banded.
PACKAGE WEIGHT: 0.095g
MOUNTING SURFACE SELECTION: The
Axial Coefficient of Expansion (COE) of this
device is approximately +4PPM/°C. The
COE of the Mounting Surface System
should be selected to provide a suitable
match with this device.
LEADED DESIGN DATA
CASE: D‐5D, Hermetically sealed glass
case, per MIL‐PRF‐19500/578 & /609
LEAD FINISH: Tin/Lead
LEAD MATERIAL: Copper clad steel
POLARITY: Cathode end is banded.
PACKAGE WEIGHT: 0.150g
TEL: 603-641-SEMI (7364) • metelics-sales@aeroflex.com • www.aeroflex.com/metelics
Revision Date: 2/5/2013
3
Switching Diodes 1N6638 Series
TEL: 603-641-SEMI (7364) • metelics-sales@aeroflex.com • www.aeroflex.com/metelics
Revision Date: 2/5/2013
4
Switching Diodes 1N6638 Series
NOTES:
1. All devices are capable of operating at ≤TJ specified on this curve. Any parallel line to this curve will
intersect the appropriate current for the desired maximum TJ allowed.
2. Derate design curve constrained by the maximum junction temperatures and current rating specified.
(See 1.3.)
3. Derate design curve chosen at TJ ≤150°C, where the maximum temperature of electrical test is performed.
4. Derate design curves chosen at TJ ≤125°C, and 110°C to show current rating where most users want to
limit TJ intheir application.
TEL: 603-641-SEMI (7364) • metelics-sales@aeroflex.com • www.aeroflex.com/metelics
Revision Date: 2/5/2013
5
Switching Diodes 1N6638 Series
Our passion for performance is defined by three
attributes represented by these three icons:
solution-minded, performance-driven and customer-focused.
Revision Date: 2/5/2013
Aeroflex / Metelics, Inc.
975 Stewart Drive, 54 Grenier Field Road,
Sunnyvale, CA 94085 Londonderry, NH 03053
Tel: (408) 737-8181 Tel: (603) 641-3800
Fax: (408) 733-7645 Fax: (603)-641-3500
Sales: 888-641-SEMI (7364)
Hi-Rel Components
9 Hampshire Street,
Lawrence, MA 01840
Tel: (603) 641-3800
Fax: (978) 683-3264
www.aeroflex.com/MetelicsHRC
Aeroflex / Metelics, Inc. reserves the right to make changes to any products and services
herein at any time without notice. Consult Aeroflex or an authorized sales representative to
verify that the information in this data sheet is current before using this product. Aeroflex
does not assume any responsibility or liability arising out of the application or use of any
product or service described herein, except as expressly agreed to in writing by Aeroflex;
nor does the purchase, lease, or use of a product or service from Aeroflex convey a license
under any patent rights, copyrights, trademark rights, or any other of the intellectual rights
of Aeroflex or of third parties.
Copyright 2009-2013 Aeroflex / Metelics. All rights reserved.
www.aeroflex.com/metelics metelics-sales@aeroflex.com
ISO 9001:2008 certified companies
Suggested Minimum Footprints
D-5D (D-BODY) U, US DIODES
NOTES:
1. Dimensions are in inches / mm.
2. The dimensions listed will match the device terminals based on worst-case package outline drawings
and assuming accuracy of device placements is within 0.005 inches. Footprints also provide for solder
filets at the outer ends of the device at least as wide as the terminals.
3. F designates recommendation to fill unused area with an extended copper pad in order to reduce the
CTE difference between the device and the PC board. The extended area may be3 coated with a solder
mask. the width of F depends upon your PCB design rules.
