RTOP100V1000JB - Vishay Presicion Group

Document Number: 50045 For technical questions, contact: sfer@vishay.com www.vishay.com

Revision: 29-Jul-09 51

RTOP

Vishay Sfernice

Power Resistor for Mounting onto a Heatsink

Thick Film Technology

FEATURES

•1 % tolerance available

•High power rating = 200 W

•Wide ohmic value range = 0.046 Ω to 1 MΩ

•Non inductive

•Easy mounting

•Low thermal radiation of the case

•Standard Isotop case (SOT-227 B)

•Compliant to RoHS directive 2002/95/EC

This series of thick film power resistors include modules which can incorporate up to 2 different resistor values in the same

SOT-227B package. Two types of terminations are available along with a 4 terminal device for measurement applications in the

case of the single resistor version. This product range benefits from Vishay Sfernice’s experience in thick film power resistor

technology i.e. high power: volume ratio, low tolerance or individual resistors and excellent overload capabilities (due to the

trimming technique).

Note

• Tolerances unless otherwise specified: ± 0.3 mm

MECHANICAL SPECIFICATIONS

Mechanical Protection

Insulated case

Substrate

Alumina on insulated base

Resistive Element

Cermet

End Connections

V connections: screw M4 x 6

Tightening Torque Connections

1 Nm

Tightening Torque Heatsink

2 Nm

Weight

30 g max.

ENVIRONMENTAL SPECIFICATIONS

Temperature Range

- 55 °C to + 125 °C

Climatic Category

55/125/56

DIMENSIONS in millimeters

12.6

16 30 38

12.6

Ø 4.2

V Connections

RTOP

ELECTRICAL SPECIFICATIONS

Resistance Range 0.046 Ω to 1 MΩ

Standard Tolerance ± 1 % to ± 10 %

Power Rating 50 W to 200 W

at + 25 °C

Temperature Coefficient

(- 55 °C to + 125 °C) Standard ± 300 ppm/°C (R < 1)

± 150 ppm/°C (R > 1)

Insulation Resistance > 106 MΩ

www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50045

52 Revision: 29-Jul-09

RTOP

Vishay Sfernice Power Resistor for Mounting onto a Heatsink

Thick Film Technology

Note

(1) MIL STD 202 Method 301

PERFORMANCE

TESTS CONDITIONS REQUIREMENTS

Momentary Overload IEC 60115-1

2.5 Pn/5 s US < 2 UL< ± (0.25 % + 0.05 Ω)

Rapid Temperature Change IEC 60115-1

5 cycles - 55 °C + 125 °C < ± (0.25 % + 0.05 Ω)

Load Life IEC 60115-1

Pn at 25 °C 1000 h < ± (0.5 % + 0.05 Ω)

Humidity (Steady State) IEC 60115-1/IEC 60068-2-3 Test Ca

56 days 95 % R.H./40 °C < ± (0.5 % + 0.05 Ω)

SPECIAL FEATURES

MODEL RTOP 200 RTOP 100 DRTOP 100 DRTOP 50

Power Rating at + 25 °C

Chassis Mounted Resistors

Unmounted Resistors

200 W

5 W

100 W

5 W

100 W

3.5 W

50 W

3.5 W

Thermal Resistance (Per Resistor) 0.5 °C/W 1 °C/W 0.5 °C/W 1 °C/W

Limiting Voltage UL 1500 V 1500 V 500 V 500 V

Dielectric Strength (1)

Connections/Chassis

2500 V, 1 min

10 mA max.

2500 V, 1 min

10 mA max.

2500 V, 1 min

10 mA max.

2500 V, 1 min

10 mA max.

Dielectric Strength (1)

Connections/Resistors - -

2500 V, 1 min

10 mA max.

2500 V, 1 min

10 mA max.

Ohmic Value Range 0.046 Ω to 1 MΩ 0.092 Ω to 1 MΩ

Tolerance ± 1 % to ± 10 % ± 1 % to ± 10 %

Electrical Diagrams

Shunt Version

Document Number: 50045 For technical questions, contact: sfer@vishay.com www.vishay.com

Revision: 29-Jul-09 53

RTOP

Power Resistor for Mounting onto a Heatsink

Thick Film Technology Vishay Sfernice

RECOMMENDATIONS FOR MOUNTING ONTO A HEATSINK

•Surfaces in contact must be carefully cleaned.

•The heatsink must have an acceptable flatness: From 0.05 mm to 0.1 mm/100 mm.

•Roughness of the heatsink must be around 6.3 µm. In order to improve thermal conductivity, surfaces in contact (alumina,

heatsink) should be coated with a silicone grease (type SI 340 from Rhône-Poulenc or Dow 340 from Dow Corning).

•For the electrical connections, it is recommended to use M4 x 6 screws and if necessary a washer of 1mm thickness. The

recommended screw tightening torque is 1 Nm.

CHOICE OF THE HEATSINK

The user must choose the heatsink according to the working conditions of the component (power, room temperature). Maximum

working temperature must not exceed 125 °C. The dissipated power is simply calculated by the following ratio:

P: Expressed in W

ΔT: Difference between maximum working temperature and room temperature.

RTH (j - c): Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal

resistance of the component (see Table Special Features).

RTH (c - a): Thermal resistance value measured between outer side of the resistor and room temperature. It is the thermal

resistance of the heatsink depending on the heatsink itself (type, shape) and the quality of the fastening device.

Example:

RTH (c - a): For RTOP 200 power rating 130 W at ambient temperature + 30 °C.

Thermal resistance (see table 1) RTH (j - c): 0.5 °C/W

Tightening Torque on Heatsink RTOP

2 Nm

PΔT

RTH (j - c)

[]RTH (c - a)

[]+

---------------------------------------------------------------

ΔT 125 °C - 30 °C - 95 °C≤≤

RTH (j - c) RTH (c - a)

ΔT

------- 95

130

----------0.73 °C/W== =+

RTH (j - c) 0.5 °C/W≤

RTH (c - a) 0.73 °C/W - 0.5 °C/W 0.23 °C/W≤≤

www.vishay.com For technical questions, contact: sfer@vishay.com Document Number: 50045

54 Revision: 29-Jul-09

RTOP

Vishay Sfernice Power Resistor for Mounting onto a Heatsink

Thick Film Technology

OVERLOADS

The applied power is 2.5 x rated power for 5 s with a max.

voltage of 2 x nominal voltage.

Accidental overload: The values indicated in the graph

below are applicable to resistors in air or mounted onto a

heatsink.

In case of multi-resistor devices, (DRTOP, TROP and

QROP) the results apply to each resistor value in the device.

ENERGY CURVE

POWER RATING

The temperature of the heater should be maintained in the

limit specified. To improve the thermal conductivity, surfaces

contact should be laid on with a silicon grease and the

torque applied on the screw for tightening should be around

2 Nm.

MARKING

Series, style, ohmic value (in), tolerance (in %),

manufacturing date, Vishay Sfernice trademark.

ENERGY IN J

0.01

0.1

100

1000

OVERLOAD DURATION IN s

10-7 10-6 10-5 10-4 10-3 10-2 10-1

RTOP DRTOP

0 20 40 60 80 100 120 140

100

RATED POWER IN %

HEATSINK TEMPERATURE IN °C

PACKAGING

Box of 10 units

ORDERING INFORMATION

RTOP 200 5U ± 1 % ± % V

DRTOP 50 150U 5 % 15U 5 % V XXX BO10 e

R1 T1 R2

MODEL STYLE OHMIC

VALUE

ABSOLUTE TOLERANCE PER

RESISTOR

CONNECTIONS

CUSTOM

DESIGN

PACKAGING LEAD

(Pb)-FREE

RTOP

DRTOP

100

Optional

± 1 %

± 2 %

± 5 %

± 10 %

To be precise

for each

resistor

V: Screw

VS: RTOP Shunt

Optional

GLOBAL PART NUMBER INFORMATION

GLOBAL

MODEL SIZE LEADS OHMIC VALUE TOL. PACKAGING SPECIAL

RTOP 100

200

V = Screw

VS = RTOP Shunt

The first three digits are

significant figures and the

last digit specifies the

number of zeros to follow.

R designates decimal point.

48R7 = 48.7 Ω

4871 = 4870 Ω

1002 = 10 000 Ω

R010 = 0.01 Ω

R680 = 0.68 Ω

2701 = 2.7 kΩ

F = 1 %

G = 2 %

J = 5 %

K = 10 %

B = Box

10 pieces

As applicable

Ex = UA1

K BOP100V5 0R T R0

Document Number: 91000 www.vishay.com

Revision: 11-Mar-11 1

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