General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print. A subsidiary of
TT electronics plc
Advanced Film Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com SMHP25 Series Issue May 2010
SMHP25 Series
Power Resistor
• 245°C reflow compatible
• TO-263 housing
• Low inductance and capacitance for high frequency circuits
• 25W power rating
• High stability film resistance elements
• RoHS compliant
Electrical Data
IRC’s SMHP series resistors satisfy demanding applications for accurate
and stable power resistors housed in the convenient TO-263 case. The
resistance element is isolated from the mounting tab by an alumina ceramic layer, providing very low thermal
resistance and ensuring high insulation resistance between terminals and metal back plate. The non-inductive
design makes these products especially useful in high frequency and high speed pulse applications.
Power Rating1Voltage
Rating4
Thermal
Resistance
Resistance Range Tolerances
Nominal
Resistance
Series5
Typ. TCR
(ppm/°C) Inductance Capacitance
Heatsink2Free Air3Min Max
25W 2.5W 500 V 3.3°C/W
0.01Ω0.09Ω
±1%, ±5%
E24
Includes
2.5 & 5.0
multiplier
See Chart <10nH <2pF
0.1Ω9.1Ω
10Ω51KΩ
1Maximum current 25 amps
2Power rating based on 25°C case temperature
3Power rating based on 25°C ambient temperature
4Maximum voltage 500V or P x R
5Contact factory for availability of resistance or tolerance
values outside this range
√
SMHP25 Series
Pulse Energy Durability
10K
1K
100
10
Pulse Width (seconds)
Pulse Peak (Watts)
10µ 100µ 1m 10m 100m
Damage Level
Safety Zone
Temperature Rise Data
Power (Watts)
120
100
80
60
40
20
0
0 5 10 15 20 25 30 35
∆Tfilm (°C)
Resistor Film Temp Rise with Respect to Tab Temp
Power Derating Data
50
155°
25°
10
100
% of Rated Power
Tab Temperature (°C)
Typical TCR For Low Values
0.01 0.1 1.0
Resistance (Ohms)
250
200
150
100
50
TCR (ppm/°C) 0 to 100°C
SMHP25 Series Issue May 2010
Advanced Film Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
SMHP25 Series
Power Resistor
Physical Data
Test Method Specification - Performance
Load Life 1,000 Hours @ 25°C;
90 minutes on, 30 minutes off ±(1.0% + 1mΩ)
Humidity 1000 hours; 40°C, 90-95% RH, 0.1W DC ±(1.0% + 1mΩ)
Temperature Cycle 5 cycles; 30 minutes @ -55°C, 30 minutes at +155°C ±(0.25% + 1mΩ)
Short Time Overload 2X Rated Power, not to exceed 1.5X Rated Voltage
for 5 seconds, 25° w/ Heat Sink ±(0.25% + 1mΩ)
Vibration 10 cycles; X, Y, Z axis, amplitude 0.75mm, 100-
2000Hz sweep/min ±(0.25% + 1mΩ)
Insulation Resistance Between terminals and tab >1000MΩ
Dielectric Withstanding Voltage Terminals to tab; 60sec, 1mA 2000 volts AC
Resistance to Solder Heat 350 ± 5°C for 3 seconds ±(0.10% + 1mΩ)
Solderability 230 ± 5°C, 3sec. >95% coverage
Operating Temperature Range -55°C to +155°C
Environmental Data
Dim In (nom) mm
A0.398 10.1 ±0.2
B0.406 10.3 ±0.2
C0.177 4.5 ±0.2
E0.197 5.0 ±1.0
F0.098 2.5 ±0.5
G0.087 2.2 ±0.2
H0.108 2.75 ±0.2
J0.020 0.5 ±0.05
K0.030 0.75 ±0.05
L0.059 1.5 ±0.05
M0.200 5.08 ±0.1
N0.059 1.5 ±0.05
P0.291 7.4 ±0.1
Lead & Tab Material Tin Plated Copper Q0.325 8.3 ±0.2
Part Weight 1.5g R0.100 2.5 ±0.2
Recommended minimum footprint dimensions.
All dimensions are in millimeters (mm).
Tab, Matte Sn Plated Cu
Joint, Solder
Substrate, Alumina
Resistor, Ni-Cr or RuO
Leads Joint, Solder
Leads, Sn Plated Cu
Case, Epoxy UL94-V0
Insulated Between Tab and Resistor
11.0
10.0
16.0
3.50
1.60
5.08
N
G
B
E
F
J
H
C
K
A
L
M
Q
R
P
SMHP25 Series Issue May 2010
Advanced Film Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
SMHP25 Series
Power Resistor
For additional information or to discuss your specific requirements, please contact our
Applications Team using the contact details below.
Ordering Data
Prefix TFP - SMHP25LF - 1R50 - J - L01
Style
SMHP25LF = 25W, TO-263 style power resistor
Resistance Code
4-digit resistance code.
Ex: 0R05 = 0.05Ω, 10R0 = 10Ω, 1K00 = 1KΩ
Absolute Tolerance Code
J = ±5%; F = ±1%
Packaging Code
L01 = RoHS compliant tube (50 pcs per tube)
L05 = RoHS compliant reel (500 pcs per reel)
Application Notes
1. Resistance measurement shall be made at the terminal
foot.
2. Thermal design should satisfy the following equation: Tab
Temperature (TT) + [Thermal Resistance (RqJT) x Power
applied (Watts)] ≤ 155°C over the full operating temperature
of the application.
3. Resistor film temperature is not to exceed 155°C during
operation.
4. This product is RoHS compliant by exemption according to
RoHS directive 2002/95/EC exemptions 5 & 7, as they apply
to lead in glass and internal solder connections.
Solder Reflow Profile
0 50 100 150 200 250 300 350 400 450 500 550
350
300
250
200
150
100
50
0
Temp (°C)
Time (sec)
150-200°C
120-180sec
400sec to Peak
Preheat
Peak 20-40sec. at
(240-245°C)
60-80sec above 217°C
Reel Dimensions
Outer Diam. 330 mm
Inner Diam. 100 mm
Width 27.4 mm max
Qty. 500pcs/reel
Reel Packaging Data
Tape Dimensions
Dim Nom.
(mm) Tol. (mm)
A010.77 0.1
B016.33 0.1
B117.0 0.1
E11.75 0.1
F 11.5 0.1
P04.0 0.1
P116.0 0.1
P22.0 0.1
T 0.4 0.05
T10.05 ---
T26.07 0.1
W 24.0 +0.3/-0.1
T
T2
T1
B1
P1
B0
A
0
P0
P2
F
E1
W
user direction of unreeling
Tape dimensions meet EIA-481 requirements
Tube Packaging Data
A
D
C
B
E
F
G
Tube Dimensions
Dim Nom.
(mm) Tol. (mm)
A 3.25 0.15
B 8.0 0.15
C 16.25 0.15
D 34.4 (34.0)
E 6.4 (6.0)
F R0.7 (R0.5)
G 535.0 1.0
