Aluminum Chassis Heat Sinkable Precision Resistors (AH)

Aluminum Chassis Heat Sinkable Precision Resistors (AH)

Outstanding Heatsink Aluminum Housed Wirewound Power Precision Resistors (AH).
Direct Electronics aluminum chassis mount units are designed for maximum heat dissipation mounting solidly to metal chassis surface for maximum heat transfer. AH series are outstanding for their high power dissipation with precision tolerances in minimum physical sizes.

Lower hot spot ratings due to exclusive complete encapsulation of element within anodized aluminum body.
AH series high-performance welded construction throughout assures long stable load life with threaded heavy stud axial-terminals.

Download complete PDF Aluminum Chassis Heat Sinkable Precision Resistors (AH).

General Specification :
  1. Operating Temperature Range: -55°C to +275°C.
  2. Resistance Tolerance: ±10%, ±5%, ±2%, ±1%, ±0.5%, ±0.25%, ±0.1%
  3. Wattage Range: 11 styles to choose ranging from 5 to 500 watts.
Non-Inductive & Features :
  1. Ayrton Perry type non-inductive winding is available. When required add "N" to the part number.
  2. Standard winding & non-inductive winding avaiable. High power rating, strong construction, small size, and ultra precision.
  3. Aluminum housing allows chassis mounting and provides heat sink capability
Materials :
  1. Encapsulant: S: Silicone, C: Cement;    End caps: Stainless steel.
  2. Core: Ceramic steatite or alumina.
  3. Housing: Aluminum with hard anodic coating.
  4. Element: Copper-nickel alloy, nickel-chrome alloy or manganese copper.
  5. AHS Standard Terminals: 5~150 W Tinned terminals, 200~500 W Threaded terminals.
  6. AHC Standard Terminals: 5~50 W Tinned terminals, 80~300 W Threaded terminals.
Heat Sinkable Dimensions (AHS-5, AHS-5N, AHS-10, AHS-10N, AHS-25, AHS-25N, AHS-50, AHS-50N)
Heat Sinkable Dimensions (AH 5W ~ 50W)
Heat Sinkable Dimensions (AHS)
Type A B C D E F G H J Φ L Φ M Φ N P
± 1.0 ± 1.0 ± 1.0 ± 2.0 ± 1.0 ± 1.0 ± 1.0 ± 0.8 ± 1.0 ± 0.8 ± 0.8 ± 0.8 Ref.
AHS-5
AHS-5N
11.4 12.5 15.5 31 8.5 16 8 1.5 4.4 2.2 1.2 1.3 8
AHS-10
AHS-10N
14 16 19.5 40.5 11.2 21 10 2 5 2.5 2 2.2 10.5
AHS-25/30
AHS-25/30N
18.3 20 27 48 14.3 27 13 2 7 3.5 2 2.2 10.5
AHS-50
AHS-50N
40 22 50 71 16.3 29 15.5 2 7.3 3.5 2 2.2 10.5

Heat Sinkable Dimensions (AHS-75, AHS-75N, AHS-100, AHS-100N, AHS-150, AHS-150N)
Heat Sinkable Dimensions Dimensions (AH-100, AH-100N)
Heat Sinkable Dimensions Dimensions (AHS)
Type A B C D E F G H J Φ L M Φ N
± 1.5 ± 1.5 ± 2.0 ± 2.0 ± 1.5 ± 1.5 ± 1.5 ± 0.8 ± 1.5 ± 1.2 ± 0.8 ± 0.8
AHS-75
AHS-75N
23.5 37 65.5 90 27 48 26 3.5 12 4.5 3 2.7
AHS-100F
AHS-100FN
35 37 98 119 27 48 26 3.5 11.5 4.5 2 2.7
AHS-150
AHS-150N
52 37 130 151 27 48 26 3.5 11.5 4.5 3 2.7

Heat Sinkable Dimensions (AHS-200, AHS-200N, AHS-250F, AHS-250FN, AHS-300, AHS-300N, AHS-500, AHS-500N)
(AH-250, AH-250N) 尺寸图
Heat Sinkable Dimensions (AHS)
Type A B C D E F G H J Φ M Φ N
± 2.5 ± 2.5 ± 3.5 ± 2.5 ± 2.5 ± 3.5 ± 2.5 ± 1.5 ± 2.0 ± 1.5 ± 1.5
AHS-200
AHS-200N
35 58 92 151 46.5 72 45 5 20 M5 5.5
AHS-250F
AHS-250FN
45 60 112 165 46.5 73 45 5 21 M6 5.5
AHS-300
AHS-300N
51 58 130 170 46.5 73 45 5 21 M6 5.5
AHS-500
AHS-500N
87 58 204 244 46.5 73 45 5 21 M6 5.5

Heat Sinkable Dimensions (AHS-250, AHS-250N)
(AH-250, AH-250N) 尺寸图
Heat Sinkable Dimensions (AHS)
Heat Sinkable Dimensions (AHC-5, AHC-5N, AHC-10, AHC-10N, AHC-25, AHC-25N, AHC-50, AHC-50N)
Heat Sinkable Dimensions (AH 5W ~ 50W)
Heat Sinkable Dimensions (AHC)
Type A B C D E F G H J Φ L Φ M Φ N P
± 1.0 ± 1.0 ± 1.0 ± 2.0 ± 1.0 ± 1.0 ± 1.0 ± 0.8 ± 1.0 ± 0.8 ± 0.8 ± 0.8 Ref.
AHC-5
AHC-5N
10 12.5 15 25 8.5 16.5 8 1.5 4 2 1.2 1.3 5
AHC-10
AHC-10N
14 15.5 19 32 10.5 20 10 2 5 2 2 2.2 6
AHC-25
AHC-25N
18 19 27 47 15 27 15.5 2 7 3.2 2 2.2 10
AHC-50
AHC-50N
39 21 50 70 15 29 15.5 2 7 3.2 2 2.2 10

Heat Sinkable Dimensions (AHC-80, AHC-80N, AHC-100S, AHC-100SN)
Heat Sinkable Dimensions Dimensions (AH-100, AH-100N)
Heat Sinkable Dimensions Dimensions (AHC)
Type A B C D E F G H J Φ L Φ M
± 1.5 ± 1.5 ± 2.0 ± 2.0 ± 1.5 ± 1.5 ± 1.5 ± 0.8 ± 1.5 ± 1.2 ± 1.5
AHC-80
AHC-80N
35 37 66 102 28 47 25 3.5 12 4.5 M5
AHC-100S
AHC-100SN
35 37 66 102 28 47 25 3.5 12 4.5 M5

Heat Sinkable Dimensions (AHC-100, AHC-100N)
(AH-250, AH-250N) 尺寸图
Heat Sinkable Dimensions (AHC)

Heat Sinkable Dimensions (AHC-250, AHC-250N, AHC-300, AHC-300N)
(AH-250, AH-250N) 尺寸图
Heat Sinkable Dimensions (AHC)
Standard Electrical Specification (AHS)
Type MIL Style Wattage
Rating
(W)
Resistance Range (Ω) Resistance
Tolerance (%)
Max.
Working (V)
Max. Weight
(g)t
Proper heat sink
(Aluminum chassis)
AHS
Inductive
AHSN
Non-inductive
AHS AHSN AHS AHSN Area (cm2) Thickness (mm)
AHS-5 RE60 5 0.01R~3K 0.01R~750R B (±0.1%)
C (±0.25%)
D (±0.5%)
F (±1%)
G (±2%)
J (±5%)
K (±10%)
F (±1%)
G (±2%)
J (±5%)
K (±10%)
( P * R ) 3 415 1
AHS-10 RE65 10 0.01R~5K 0.01R~1K25 6 415
AHS-25 RE70 25 0.01R~10K 0.01R~2K 11 535
AHS-30   30 0.01R~10K 0.01R~2K 18 535
AHS-50 RE75 50 0.01R~10K 0.01R~2K 30 995
AHS-75   75 0.01R~20K 0.5R~5K 90 995 3
AHS-100 RE77 100 1R~30K 1R~7K 265 2780
AHS-150   150 1R~40K 1R~10K 265 995
AHS-200   200 1R~50K 1R~12K 420 3750
AHS-250 RE80 250 1R~50K 1R~12K 510 4900
AHS-250F RE80 250 1R~50K 1R~12K 480 4765
AHS-300   300 1R~50K 1R~12K 580 5780
AHS-500   500 1R~50K 1R~12K 970 8500
Standard Electrical Specification (AHC)
Type MIL Style Wattage
Rating
(W)
Resistance Range (Ω) Resistance
Tolerance (%)
Max.
Working (V)
Max. Weight
(g)t
Proper heat sink
(Aluminum chassis)
AHC
Inductive
AHCN
Non-inductive
AHC AHCN AHC AHCN Area (cm2) Thickness (mm)
AHC-5 RE60 5 0.1R~3K 0.1R~750R B (±0.1%)
C (±0.25%)
D (±0.5%)
F (±1%)
G (±2%)
J (±5%)
K (±10%)
F (±1%)
G (±2%)
J (±5%)
K (±10%)
( P * R ) 6 415 1
AHC-10 RE65 10 0.1R~5K 0.1R~1K25 11 415
AHC-25 RE70 25 0.1R~10K 0.1R~2K 20 535
AHC-50 RE75 50 0.1R~10K 0.1R~2K 30 995
AHC-80   75 0.1R~20K 0.5R~5K 90 995
AHC-100S   100 1R~30K 1R~7K 160 2780 3
AHC-100 RE77 100 1R~3K 1R~3K 100 995
AHC-250 RE80 250 1R~3K 1R~3K 480 4900
AHC-300   300 1R~3K 1R~3K 580 5780
Surface Temperature Versus Power Load (Mounted on heat-sink chassis) (AH)
(AH) Surface Temperature Versus Power Load
(AH) Surface Temperature Versus Power Load

Ambient Temperature Derating (AH)
(AH) Ambient Temperature Derating
(AH) Ambient Temperature Derating
Derating is required for ambient temperatures above 25°C, see the graph.
Curve Aluminum Chassis applies to all types when mounted to specified heat sink.
Curves A, B, C apply to operation of unmounted resistors.

  1. Curves A: AH 5 and 10 watt unites, unmounted.
  2. Curves B: AH 25 watt units, unmounted.
  3. Curves C: AH 50, 100 and 250 watt units, unmounted.

Reduced Heat Sink Derating (AH)
(AH) Reduced Heat Sink Derating
(AH) Reduced Heat Sink Derating
Derating is also required when recommended heat sink area is reduced.

  1. Curves A: AH-5 and AH-10 size resistor.
  2. Curves B: AH-25 size resistor.
  3. Curves C: AH-50, AH-100 and AH-250 size resistor.
Test Conditions (AH)
Parameters Test Conditions Specifications
T.C.R. Room temperature /100°C up. ±25, 50, 100, 250ppm/°C
Short Time Over Load 5 × wattage rating-5sec. Δ R±(2%+0.05Ω)Max.
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) (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-30, AHS-50, AHS-75, AHS-100 2000V
AHS-150, AHS-200, AHS-250, AHS-300, AHS-500 2500V
Δ R±(0.5%+0.05Ω)Max.
AHC-5 AHC-10 AHC-25 800V
AHC-50, AHC-80, AHC-100 1000V
AHC-250, AHC-300 2500V
Insulation Resistance Under the same test condition of Dielectric Strength, Load DC500V and measure the Insulation R. AHS: 1000 MΩ Min.
AHC: 100 MΩ Min.
Moisture Resistance Temp 40°C moisture 95% DC 100V 100 Hrs. Δ R±(5%+0.05Ω)Max.
Moisture Load Life Temp 40°C moisture 90% 1/10 X wattage rating (1.5 Hrs on-0.5hrs off)-Repeat 200 Hrs. Δ R±(5%+0.05Ω)Max.
Resistance to Soldering Heat 350°C ± 10°C for 3±0.5 Seconds Δ R±(1%+0.05Ω)Max.
Order Codes (AH)
AH S 10/10N 20Ω D
Part Number
AH
Encapsulant
S Silicone
C Cement
Rated Power (W)
10 10W
10N 10W
250 250W
250N 250W
N Non-Inductive
F Custome Design
S Compact Size
Resistance Value (Ω)
R51 0.51Ω
5R1 5.1Ω
51R 51Ω
510R 510Ω
5K1 5.1KΩ
Resistance Tolerance (%)
B ±0.10%
C ±0.25%
D ±0.5%
F ±1%
G ±2%
J ±5%
K ±10%