1
ISO-9001
Registered
D (Lead Diameter)
0.020 (0.5)
0.020 (0.5)
0.020 (0.5) 0.025 (0.64)
0.025 (0.64) 0.032 (0.8)
0.032 (0.8)
0.032 (0.8)
0.032 (0.8)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
0.040 (1.0)
D
C
A
1.50 min.
(38.1)
B
SEMI-PRECISION POWER
WIREWOUND RESISTOR
AS SERIES
• •
• •
•
1/4 watt to 10 watts
••
••
•
±5%, ±3%, ±1%, ±.5% tolerance
••
••
•
0.1 ohm to 175K ohms
• •
• •
•
Resistance wire TCR ±20 ppm/°C
SPECIFICATIONS:
Inductance of AS-1/2 is less than 1µH at 1MHz. * Typical inductance of AS-1C <5 ohms is < 1µH.
To order non-inductive types, add the prefix "N". Example: NAS-1, NAS-2C, etc. Lower values available upon request.
DIMENSIONS (Inches and (mm)):
Please note lead length
dimension change on the
following two items only:
AS-2B 1.3 min
AS-2C 1.3 min
NOTE:
• Coating and marking is resistant to nor mal freon degreasing.
Consult factory for special requirements.
• AS marking available in Alpha Numeric or Colorbanding -
identification available.
Heat conducting
ceramic substrate
Alpha - Digital
Marking
Silicone conformal
coating
All welded cap
and lead
assembly
Alloy resistance wire wound
to specific parameters
including TCR's from ±20 to
+5500 ppm/°C
Equivalent
MIL-R-26
Style
RW81
RW70U
RW-69V/
RW79U
RW74U/
RW67V
RW68V/
RW78U
Power Rating 275°C
Max. Hot Spot (watts) Commercial Range
(ohms) Non-Inductive Range
(ohms) Available Resistance
(ohms)
125°C
0.5
0.5
1
1
2
3
2
3
5
7
10
25°C
1
1
2
2
3
4
3
5
7
9
14
Min.
0.1
0.1
0.1
.05
0.1
0.1
0.1
0.1
0.1
0.1
0.1
Max.
1.0K
6.0K
7.5K
2K
20K
24K
18K
30K
60K
90K
175K
Min.
*
*
0.1
*
0.5
0.5
0.2
0.5
0.8
1.0
3.0
Max.
*
*
3.8K
*
10K
12K
7.5K
15K
30K
45K
50K
0.5%, 1%
1-1K
1-6K
1-7.5K
1-2K
1-20K
1-24K
1-18K
1-30K
1-60K
1-90K
1-175K
3%, 5%
0.1-1K
0.1-6K
0.1-7.5K
.05-2K
0.1-20K
0.1-24K
0.1-18K
0.1-30K
0.1-60K
0.1-90K
0.1-175K
IRC T ype
AS-1/4
AS-1/2
AS-1
AS-1C
AS-2
AS-2B
AS-2C
AS-3
AS-5
AS-7
AS-10
A±0.032
0.250 (6.4)
0.312 (7.9)
0.367 (9.3)
0.256 (6.5)
0.480 (12.2)
0.540 (13.7)
0.489 (11.0)
0.687 (17.5)
0.875 (22.2)
1.250 (31.8)
1.812 (46.0)
*Leads 60/40 are solder plated. AS-1C leads are copper. All others are 40% conductivity copper sheathed steel.
B (max)
0.094 (2.4)
0.094 (2.4)
0.125 (3.2)
0.115 (2.9)
0.250 (6.3)
0.219 (5.6)
0.157 (4.0)
0.282 (7.2)
0.344 (8.8)
0.344 (8.8)
0.385 (9.8)
C (max)
0.312 (7.9)
0.375 (9.5)
0.429 (10.9)
0.303 (7.7)
0.600 (15.2)
0.663 (16.6)
0.594 (15.1)
0.812 (20.6)
0.980 (24.9)
1.375 (35.0)
1.937 (49.2)
IRC Type
AS-1/4
AS-1/2
AS-1
AS-1C
AS-2
AS-2B
AS-2C
AS-3
AS-5
AS-7
AS-10
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, Nor th Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
2
ISO-9001
Registered
TEST CONDITION
Load Life 1000 hours
Moisture Resistance
Temperature Cycle
Short Time Overload
Low Temperature Operation
Solder Heat
Shock
Vibration
25 75 125 175 225 275
0
75
100
125
150
175
200
AS-1/4, 1/2, 1
AS-3
AS-2A, 2C
AS-2
AS-5, 10
AS-7, 25
0 40 80 120 160 200
50
100
150
200
250
275
AS-7, 10
AS-5
AS-2A, 2C
AS-2
AS-2B
AS-1/2
AS-1/4
25
POWER DERATING:
ENVIRONMENT AL TESTING AT 25°C: HOW TO ORDER:
Sample Par t No.:
AS-3 27R0
0.25%
Type
Power
3 =3 watts
(See specification char t
for other power ratings)
Resistance V alue
Expressed in ohms
(Standard EIA/MIL Values)
Tolerance
±5%, ±3%, ±1%, ±0.5%
MAX ∆∆
∆∆
∆R
1.0%
1.0%
0.5%
0.5%
0.5%
0.25%
0.5%
0.5%
TEMPERATURE RISE @ 125°C:
Ambient Temperature (°C)
Percent of 125°C Power Rating
Percent of 25°C Power Rating
Hot Spot Temperature (°C)
TEMPERATURE RISE @ 25°C:
0.1 0.2 0.5 1 2 5 10
0
2
4
6
8
10
12
14
AS-2A
AS-3
AS-2
AS-2B
AS-1
AS-2C
AS-1/2
AS-1/4
SELECTED PULSE-HANDLING
CAPABILITY @ 125°C:
Resistance (ohms)
Energy (watts-second)
AS-3, AS-1, AS-2
AS-2B
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, Nor th Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
0 20406080100
125
150
200
250
275
AS-7, 10
AS-5
AS-3, 2A, 2C
AS-2 AS-2B
AS-1/2
AS-1/4
Percent of 125°C Power Rating
Hot Spot Temperature (°C)
AS2A, AS2C
AS-3, AS-5
0 40 80 120 160 200
AS-7, 2B
