SM1206 Series
Part Numbering System
SM1206 -
Fuse Type
32 -
Voltage
1.0
Amp
Part Number/Rating
Part No.
Maximum
voltage
(VDC)
32
32
32
32
32
32
24
24
24
24
Current
Rating
(AMP)
1/2
3/4
1.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
Cold Resistance
(Ohm)
Note 1
Minimum Maximum Figure*
Overload Interrupt
Time (Second)
Nominal Rating - Note 2
250%
400%
600%
Maximum I
2
T
(Ampere
2
Second)
Nominal Rating
250%
15.625
35.156
31.250
42.188
75.000
56.250
100.000
156.250
225.000
306.250
400%
0.060
0.135
0.260
0.360
0.640
1.440
2.560
4.000
5.760
7.840
600%
0.027
0.061
0.108
0.243
0.432
0.972
1.728
2.700
3.888
5.292
SM1206-32-1/2
SM1206-32-3/4
SM1206-32-1.0
SM1206-32-1.5
SM1206-32-2.0
SM1206-32-3.0
SM1206-24-4.0
SM1206-24-5.0
SM1206-24-6.0
SM1206-24-7.0
0.450
0.198
0.120
0.0825
0.0410
0.0240
0.0184
0.0120
0.0105
0.0096
0.750
0.331
0.190
0.1375
0.0680
0.0400
0.0276
0.0180
0.0175
0.0144
1
1
1
1
1
1
1
1
1
1
.005-
10.0
.005-
10.0
.005-
5.0
.005-
3.0
.005-
1.0
.005-
1.0
.005-
1.0
.005-
1.0
.010-
1.0
.010-
1.0
.0005- .00005-
.015
.003
.0005- .00005-
.015
.003
.0005- .0001-
.010
.003
.0005- .0001-
.010
.003
.0005- .0001-
.010
.003
.0005- .0001-
.010
.003
.0005- .0001-
.010
.003
.0005- .0001-
.010
.003
.0005- .0001-
.010
.003
.0005- .0001-
.010
.003
NOTES:
1. Cold resistance is measured at from 0.1 to 10 milliamperes of current.
2.
Fuse overload interrupt time(s) at +25ºC and +125ºC.
*
Please see SM1206 Spec Sheets for figures detailing dimensions, construction and marking
11525 Sorrento Valley Rd.
San Diego, California 92121
(858) 481- 0210
SPECIFICATION SHEET
CURRENT LIMITING FUSE
1206 SURFACE MOUNT MODEL (CHIP)
REVISION:
DATE:
DRAWN:
CHECKED:
APPROVED:
ECN:
A
2/99
B
10/01
Jeff Montgomery
Mike Van Linge / Yan Ma
Jeff Montgomery
2129
Drawing: SM1206
SHEET 1 OF 17
1.
SCOPE
1.1
Scope. This specification establishes the requirements for thick film current limiting 1206 chip
fuses. Fuses described in this document are designed and manufactured for high reliability applications based
on guaranteed blow limits. These fuses are intended for use in direct (DC) and alternating current (AC) circuits
and are capable of operation over a temperature range of –55°C to +125°C ambient including high vacuum
environments.
2.
LOT ACCEPTANCE TESTING
2.1
Lot Acceptance Testing. This specification provides for two acceptance levels for the
procurement of the fuses. The degree of testing and associated documentation can be specified as appropriate
to the end use of the fuses. Regardless of the acceptance level specified, the inherent quality and reliability of
the fuses will remain constant. The acceptance levels with the applicable inspection required are indicated in
Table I.
TABLE I. LOT ACCEPTANCE LEVEL.
3.
APPLICABLE DOCUMENTS
3.1
Issues of Documents. The following specifications, standards and handbooks form a part of this
specification to the extent specified herein. In the event of a conflict between the documents referenced herein
and this specification, this specification governs.
SPECIFICATIONS
MIL-PRF-23419:
MIL-F-14256:
STANDARDS
MIL-STD-202:
MIL-STD-790:
MIL-STD-45662:
OTHERS
ASTM E595:
Materials from Outgassing in a Vacuum Environment, Total Mass Loss
and Collected Volatile Condensable, Standard Test Method for.
11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306.
REVISION B
ECN 2129
TITLE
SM1206 CURRENT LIMITING FUSE
SHEET 2 of 17
General Specification for Instrument Type Fuses.
Flux, Soldering, Liquid (Rosin Base).
Test Methods for Electronic and Electrical Component Parts.
Reliability Assurance Program for Electronic Parts Specifications.
Calibration System Requirements.
AEM, Inc.
NUMBER
SM1206
P70435
P71248
4.
REQUIREMENTS
AEM Operation for Snapstrate Visual (Element/Termination).
AEM Operation for Final Visual Inspection of Chip Fuses.
4.1
Qualification. Fuses manufactured in accordance with this document shall be capable of passing
the qualification requirements specified in Table V and section 4 of this document.
4.2
Materials, Design and Construction. The materials, design and construction of the fuses shall be
as specified herein.
4.2.1 Terminals. The base terminations shall be silver with plated nickel and a final finish of
Sn90/Pb10 solder coating. Under no circumstances shall the tin percentage exceed 97%.
4.3
Voltage Rating. The voltage ratings for fuses specified herein are 24 and 32 volts DC. The
applicable voltage ratings are specified in Table VI.
4.4
Current Rating. The current rating is the maximum amperes that the fuse will carry at a
substrate temperature of +25°C without degradation. The applicable current ratings are specified in Table VI.
4.5
Temperature Rating. The temperature rating for fuses specified herein is –55°C to +150°C
nonoperating. The maximum operating temperature shall not exceed a substrate temperature of +125°C. The
temperature derating curve is given in Figure 3.
4.6
Resistance Rating. The cold resistance of the fuses shall be as specified in Table VI when
measured in accordance with 5.8.2.
4.7
Performance.
4.7.1 Thermal Shock. When fuses are tested in accordance with 5.8.3 herein, they shall show no
electrical or mechanical damage.
4.7.2 Current-Carrying Capacity. When fuses are tested in accordance with 5.8.6, they shall show no
evidence of mechanical damage and shall carry the current as specified without electrical failure. The temperature
rise of the substrate shall at no point rise more than +85°C above the ambient air temperature.
4.7.3 Termination Strength. When fuses are tested in accordance with 5.8.7, the end terminations shall
not break or loosen. The cold resistance values shall not change by more than 10 percent.
4.7.4 Thermal Vacuum (Qualification Only). When fuses are tested in accordance with 5.8.16, they shall
not open circuit during the application of derated DC current nor shall there be evidence of arcing or mechanical
damage after the test. Fuses that are subjected to the 400 percent overload current test shall "blow" within the time
period specified (see Table VI). The cold resistance values of those fuses not subjected to the overload current
shall not change by more than 10 percent when measured after thermal vacuum exposure.
AEM, Inc.
NUMBER
SM1206
11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306.
REVISION B
ECN 2129
TITLE
SM1206 CURRENT LIMITING FUSE
SHEET 3 of 17
4.7.5
Overload Current.
4.7.5.1 Overload Current Characterization. Each fuse lot shall be sampled to assure that the blow times
fall within the limits of Table VI. Each lot shall be truncated to form an inspection lot based upon the cold resistance
measured after thermal shock. The manufacturer shall blow samples (a minimum of 20 samples total) selected
from the extremes of the truncated population to insure that their blow times are within the specification. The results
of this procedure shall be included in the "Group A Data" with the lot data package.
4.7.5.2 Overload Current. Fuses selected from a truncated distribution shall be tested in accordance with
2
5.8.14. The clearing times and the maximum I t shall be as specified in Table VI. After clearing, the circuit shall
remain open without closing again during a one-minute period. The let through energy during the one-minute period
2
shall be included in the calculation of I t. The blown fuses shall meet the resistance after firing test of 4.7.6.
4.7.6 Resistance after Firing. When blown fuses are tested in accordance with 5.8.15, the minimum
resistance shall be 1 megohm.
4.7.7 Moisture Resistance (Group C / Qualification Only). When fuses are tested in accordance with
5.8.8, there shall be no evidence of mechanical damage or excessive corrosion of the terminations. The resistance
of the fuses shall not change by more than 15 percent as a result of the moisture exposure.
4.7.8 Shock (Group C / Qualification Only). When fuses are tested in accordance with 5.8.9, there shall
be no evidence of mechanical damage and the fuse resistance shall not change by more than 10 percent.
4.7.9 Vibration (Group C / Qualification Only). When fuses are tested in accordance with 5.8.10, there
shall be no evidence of mechanical damage and the fuse resistance shall not change by more than 10 percent.
4.7.10 Low Temperature Operation (Group C / Qualification Only). When fuses are tested in accordance
with 5.8.12, they shall not open circuit and the fuse resistance shall not change by more than 10 percent.
4.7.11 Life (2000 Hours, Group C / Qualification Only). When fuses are tested in accordance with 5.8.13,
they shall not open circuit and the fuse resistance shall not change by more than 10 percent.
4.7.12 Resistance to Soldering Heat. When fuses are tested in accordance with 5.8.11, there shall be no
mechanical damage and the fuse resistance shall not change by more than 10 percent.
4.7.13 Solderability. Fuses shall meet the solderability requirements specified in MIL-STD-202, Method
208.
4.7.14 Salt Spray (Group C / Qualification Only). When fuses are tested in accordance with 5.8.17, there
shall be no evidence of excessive corrosion. Excessive corrosion is defined as that which interferes with the
electrical or mechanical performance. There shall be no mechanical damage and the fuse resistance shall not
change by more than 10 percent.
4.7.15 Outgassing. When fuses are tested in accordance with 5.8.18, the materials shall meet the
following requirements:
a)
b)
Total mass loss (TML) - Shall not exceed 1.0 percent.
Collected volatile condensable material (CVCM) - Shall not exceed 0.1 percent.
4.7.16 Short Circuit Interrupt (Group C / Qualification Only). When fuses are tested in accordance with
5.8.19, the resistance after short circuit testing shall be at least 1 megohm.
4.7.17 Pre-Cap Inspection (Group A). Prior to arc suppressant application, the fuses shall be inspected
at 10X magnification. Inspection criteria are outlined in AEM Operation P70435.
AEM, Inc.
NUMBER
SM1206
11525 SORRENTO VALLEY RD
SAN DIEGO, CA 92121-1306.
REVISION B
ECN 2129
TITLE
SM1206 CURRENT LIMITING FUSE
SHEET 4 of 17
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