Direct's new flat core winding technology allows for wirewound heatsinkable resistor affording a very low profile, and superior thermal transfer characteristics when compared to conventional aluminum housed wirewound resistor.
Close mounting of heat sensitive components is possible due to only a slight rise of the temperature on the aluminum profile. No heat sink compound is required because of large mounting surface.

  • Feature:
    power,resistors,wirewound Complete welded construction.
    Mounts on chassis to utilize heat-sink effect.
    Meets applicable requirements of MIL-PRF-18546.
    Molded construction for total environmental protection.
    Excellent stability in operation (<1% change in resistance).
    Available in non-inductive styles with Aryton-Perry winding for lowest reactive components.
  • General Specification:
    Wattage Range: 6 styles to choose ranging from 5 to 250 watts.
    Resistance Tolerance: 10%, 5%, 3%, 2%, 1%, 0.5%
    Operating Temperature Range : -55% to +275°C
Aluminum Housed AH Resistors - Materials
Encapsulant: S: Silicone, C: Cement.
End caps: Stainless steel
Core: Ceramic steatite or alumina
Housing: Aluminum with hard anodic coating
Element: Copper-nickel alloy, nickel-chrome alloy or manganese copper
Standard Terminals: 5~50W Tinned terminals , 100~250W Threaded terminals.

AH 5W~50W Dimensions (Unit: mm)
Aluminum Housed AH 5W~50W Dimensions
Type Dimensions(mm)
A B C D E F G H J K L M N P
± 1.0 ± 1.0 ± 1.0 ± 2.0 ± 1.0 ± 1.0 ± 1.0 ± 0.8 ± 1.0 ± 0.8 ± 0.5 ± 0.5 ± 0.2 ± 0.8
AH-5 11.2 125 15.2 28.6 8.5 16.4 8.1 1.7 3.8 2 2.4 1.5 1.3 6.7
AH-5N 11.2 125 15.2 28.6 8.5 16.4 8.1 1.7 3.8 2 2.4 1.5 1.3 6.7
AH-10 14.2 15.9 19 34.9 10.7 20.3 9.9 1.9 4.2 2.4 2.4 2 2.2 7.95
AH-10N 14.2 15.9 19 34.9 10.7 20.3 9.9 1.9 4.2 2.4 2.4 2 2.2 7.95
AH-25 18.2 19.8 27 49.2 14 27.4 13.9 1.9 5.9 4.4 3.2 1 2.2 11.1
AH-25N 18.2 19.8 27 49.2 14 27.4 13.9 1.9 5.9 4.4 3.2 1 2.2 11.1
AH-50 40 21.4 50 70.6 16 29 15.5 2.2 6.6 5 3.2 2 2.2 10.3
AH-50N 40 21.4 50 70.6 16 29 15.5 2.2 6.6 5 3.2 2 2.2 10.3
Notice: All values might be changed or modified, please consult factory for details.

AH-100, AH-100N Dimensions (Unit: mm)
Aluminum Chassis resistors AH-100, AH-100N Dimensions non-inductive
Notice: All values might be changed or modified, please consult factory for details.

AH-250, AH-250N Dimensions (Unit: mm)
Power Aluminum Resistor AH-250, AH-250N Dimensions Non-inductance
Notice: All values might be changed or modified, please consult factory for details.

AHS Type Wirewound Aluminum Housed - Electrical Specification
Type MIL Type 25°C Rated Power (W) Resistance Range (Ω)
Industry Military Resistance Tolerance
(± %)
Resistance Range
(Ω)
Temperature Coefficient
(±PPM/°C)
AHS-5 RE60G 5 5 0.1, 0.25, 0.5 10~1K 25
0.5, 1 1.0~3.32K 25, 50
5, 10 0.1~3.32K 100, 250
10 0.01~3.32K 100, 250
AHS-5N RE60N 5 5 1, 5 10~200 25, 50
5 1.0~860 100
5, 10 0.1~860 100, 250
10 0.01~1K 100, 250
AHS-10 RE65G 10 10 0.1, 0.25, 0.5 10~1.2K 25, 50
0.5, 1 1.0-2.7K 50, 100
5, 10 0.1~2.7K 100, 250
10 0.01~5.62K 100, 250
AHS-10N RE65N 10 10 1, 5 10~860 25, 50
5 1.0~1.2K 100
5, 10 0.1~1.2K 100, 250
10 0.01~1.5K 100, 250
AHS-25 RE70G 25 20 0.1, 0.25, 0.5 10~2.7K 25, 50
0.5, 1 1.0~3.9K 50, 100
5, 10 0.1~3.9K 100, 250
10 0.01~12.1K 100, 250
AHS-25N RE70N 25 20 1, 5 10~1.2K 25, 50
5 1.0~2.7K 100
5, 10 0.1~2.7K 100, 250
10 0.01~6.04K 100, 250
AHS-50 RE75G 50 30 0.1, 0.25, 0.5 10~3.9K 25, 50
0.5, 1 1.0~5.6K 50, 100
5, 10 0.1~5.6K 100, 250
10 0. 01~39.2K 100, 250
AHS-50N RE75N 50 30 1, 5 10~2.7K 25, 50
5 1.0~3.9K 100
5, 10 0.1~3.9K 100, 250
10 0.01~19.6K 100, 250
AHS-100 RE77G 100 75 0.1, 0.25, 0.5 10~5.6K 25, 50
0.5, 1 1.0~8.2K 50, 100
5, 10 0.1~12K 100, 250
10 0.01~29.4K 100, 250
AHS-100N RE77N 100 75 1,5 10~3.9K 25, 50
5 1.0~5.6K 100
5, 10 0.1~5.6K 100, 250
10 0.01~14.7K 100, 250
AHS-250 RE80G 250 120 0.1, 0.25, 0.5 10~12K 25, 50
0.5, 1 1.0~27K 50, 100
5, 10 0.1~27K 100, 250
10 0.01~35.7K 100, 250
AHS-250N RE80N 250 120 1, 5 10~5.6K 25, 50
5 1.0~8.2K 100
5, 10 0.1~8.2K 100, 250
10 0.01~17.4K 100, 250
Notice: All dimensions might be changed or modified, please refer to last updating specification.

AHC Type Wirewound Aluminum Housed - Electrical Specification
Type 25°C Rated Power
(W)
Resistance Range (Ω)
Resistance Tolerance
(± %)
Resistance Range
(Ω)
Temperature Coefficient
(±PPM/°C)
AHC-5 5 0.1, 0.25, 0.5 10~1K 25
0.5, 1 1.0~3.32K 25, 50
5, 10 0.1~3.32K 100, 250
10 0.01~3.32K 100, 250
AHC-5N 5 1, 5 10~200 25, 50
5 1.0~860 100
5, 10 0.1~860 100, 250
10 0.01~1K 100, 250
AHC-10 10 0.1, 0.25, 0.5 10~1.2K 25, 50
0.5, 1 1.0-2.7K 50, 100
5, 10 0.1~2.7K 100, 250
10 0.01~5.62K 100, 250
AHC-10N 10 1, 5 10~860 25, 50
5 1.0~1.2K 100
5, 10 0.1~1.2K 100, 250
10 0.01~1.5K 100, 250
AHC-25 25 0.1, 0.25, 0.5 10~2.7K 25, 50
0.5, 1 1.0~3.9K 50, 100
5, 10 0.1~3.9K 100, 250
10 0.01~12.1K 100, 250
AHC-25N 25 1, 5 10~1.2K 25, 50
5 1.0~2.7K 100
5,10 0.1~2.7K 100, 250
10 0.01~6.04K 100, 250
AHC-50 50 0.1, 0.25, 0.5 10~3.9K 25, 50
0.5, 1 1.0~5.6K 50, 100
5, 10 0.1~5.6K 100, 250
10 0. 01~39.2K 100, 250
AHC-50N 50 1, 5 10~2.7K 25, 50
5 1.0~3.9K 100
5, 10 0.1~3.9K 100, 250
10 0.01~19.6K 100, 250
AHC-100 100 0.1, 0.25, 0.5 10~5.6K 25, 50
0.5, 1 1.0~8.2K 50, 100
5, 10 0.1~12K 100, 250
10 0.01~29.4K 100, 250
AHC-100N 100 1, 5 10~3.9K 25, 50
5 1.0~5.6K 100
5, 10 0.1~5.6K 100, 250
10 0.01~14.7K 100, 250
AHC-250 250 0.1, 0.25, 0.5 10~12K 25, 50
0.5, 1 1.0~27K 50, 100
5, 10 0.1~27K 100, 250
10 0.01~35.7K 100, 250
AHC-250N 250 1, 5 10~5.6K 25, 50
5 1.0~8.2K 100
5, 10 0.1~8.2K 100, 250
10 0.01~17.4K 100, 250
Notice: All dimensions might be changed or modified, please refer to last updating specification.

Surface Temperature Versus Power Load (on Chassis)
Surface Temperature Versus Power Load (on Chassis)

AH-5W/10W: Heatsink Required : 0.040 [1.0] Alum.Plate, 129 in2[832 cm2] or equiv.
AH-25W: Heatsink Required : 0.040 [1.0] Alum.Plate, 167 in2[1077 cm2] or equiv.
AH-50W: Heatsink Required : 0.059 [1.5] Alum.Plate, 291 in2[1877 cm2] or equiv.
AH-100W: Heatsink Required : 0.125 [3.2] Alum.Plate, 294 in2[1896 cm2] or equiv.
AH-250W: Heatsink Required : 0.125 [3.2] Alum.Plate, 895 in2[5780 cm2] or equiv.


Derating
AH Power Derating

Derating is required to reduce chassis ounting area and for high ambient temperatures.
Curves: A=5 & 10 watt unites, unmounted.B=25 watt units, unmounted.C=50,100 & 250 watt units, unmounted.


Heat Sink Derating
AH Heat Sink Derating

REDUCED HEAT SINK DERATING:
Derating is also required when recommended heat sink area is reduced.
A = AH-5 and AH-10 size resistor.
B = AH-25 size resistor
C = AH-50, AH-100 and AH-250 size resistor


Aluminum Housed Wirewound - Characteristics
Parameters Test Conditions Specifications
Vibration 10~50~10Hz/Min -X- Y- Z Axis 2 Hours each. Δ R±(0.2%+0.05Ω)Max.
Load Life Load Rating (chassis mounted)
25°C (1.5 Hour on 0.5 Hour OFF) Repeat 1000 Hours
Δ R±(5%+0.05Ω)Max.
Terminal Strength (1)Pull Test (30 sec Min)
AH-5 1kg, AH-10 2.3kg, AH-25, AH-50 4.5kg
(2)Torque Test (5~15sec)
AH-100 27kg-cm, AH-250 36kg-cm
Δ R±(0.2%+0.05Ω)Max.
Dielectric Strength AHS-5 AHS-10 AHS-25 1000V
AHS-50 2000V
AHS-100 AHS-250 3000V
Δ R±(0.5%+0.05Ω)Max.
AHC-5 AHC-10 AHC-25 1000V
AHC-50 1500V
AHC-100 AHC-250 2500V
Insulation Resistance Under the same test condition of Dielectric Strength, Load DC500V and measure the Insulation R. 100MΩ Min.
Moisture Resistance Temp 40°C moisture 95% DC 100V 100Hr Δ R±(5%+0.05Ω)Max.
Short Time Over Load 5 × wattage rating-5sec. Δ R±(2%+0.05Ω)Max.

How to Order
AH S 10/10N 20Ω D
Product Type
AHS-5 / AHS-5N
AHC-5 / AHC-5N
AHS-25 / AHS-25N
AHC-25 / AHC-25N
Encapsulant
S: Silicon
C: Cement
Rated Power
(W)
10 (10W)
10N (10W)
250 (250W)
250N (250W)
N: Non-Inductive
Resistance Value
(Ω)
R51 0.51Ω
5R1 5.1Ω
51R 51Ω
510R 510Ω
5K1 5.1KΩ
Resistance Tolerance
(%)
A5 ±0.05%
B ±0.10%
C ±0.25%
D ±0.5%
F ±1%
J ±5%
K ±10%

Page: 1 / 2


Direct Electronics Tech. Co., Ltd.
Taiwan Tel:+886-2-29810109 Fax:+886-2-29887487
China Tel:+86-755-26055363 Fax:+86-755-26055365