RPS250D datasheet, PDF - EEWORLD Datasheet

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RPS250D: DescriptionRESISTOR, METAL GLAZE/THICK FILM, 250 W, 1; 2; 5; 10 %, 150; 250 ppm, 0.24 ohm - 1000000 ohm, CHASSIS MOUNT, ROHS COMPLIANT; CategoryPassive components The resistor; File Size81KB，4 Pages; ManufacturerVishay; Websitehttp://www.vishay.com

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RPS250D Overview

RESISTOR, METAL GLAZE/THICK FILM, 250 W, 1; 2; 5; 10 %, 150; 250 ppm, 0.24 ohm - 1000000 ohm, CHASSIS MOUNT, ROHS COMPLIANT

RPS250D Parametric

Parameter Name	Attribute value
Maker	Vishay
package instruction	,
Reach Compliance Code	unknown
Other features	RATED AC VOLTAGE (V): 5000
Installation features	CHASSIS MOUNT
Number of terminals	2
Maximum operating temperature	125 °C
Minimum operating temperature	-55 °C
Package shape	RECTANGULAR PACKAGE
method of packing	BULK
Rated temperature	50 °C
Resistor type	FIXED RESISTOR
surface mount	NO
technology	METAL GLAZE/THICK FILM
Terminal shape	BINDING POST

RPS250D Preview

RPS 250

Vishay Sfernice

Power Resistor for Mounting onto a Heatsink

Thick Film Technology

FEATURES



High power rating: 250 W



High overload capability up to 4 times nominal

power (see energy curve)



Easy mounting



Low thermal radiation of the case



Compliant to RoHS directive 2002/95/EC

Developed for specific applications such as railroad electrical traction, this series can bear short overloads as high as fifteen times

the nominal power. Designed to be mounted onto a heatsink, these power resistors exhibit remarkable characteristics.

DIMENSIONS

in millimeter

RPS 250D

10.5

± 1

16.5

5.7

Ø 7.2

35.8

2 M4 USEFUL DEPTH: 6

Ø 4.2

Note

• Tolerance unless stated: ± 0.2 mm

MECHANICAL SPECIFICATIONS

Insulated case

Alumina onto

aluminum base

Resistive Element

Cermet

End Connections

Screws M4, (M5 on

request)

Tightening Torque on Connections

2 Nm

Weight

170 g ± 10 %

Mechanical Protection

Substrate

Ø 21

ELECTRICAL SPECIFICATIONS

Resistance Range

Tolerance

Power Rating chassis mounted

250 W

1000 W

Temperature Coefficient

Standard

Limiting Element Voltage U

0.24

to

1 M E24 series

± 1 % to ± 10 %

at 50 °C continuous

at 25 °C for 10 s

± 250 ppm/°C < 1

± 150 ppm/°C > 1

5 kV

RMS

ENVIRONMENTAL SPECIFICATIONS

Thermal Resistance

Temperature Range

Climatic Category

TH (j - c)

0.22 °C/W

- 55 °C + 125 °C

55/125/56

Dielectric Strength

L connections 7 kV

RMS

MIL STD 202 (301), 1 min, 10 mA max.

H connections 12 kV

RMS

Insulation Resistance

Inductance

Capacitance Resistor/

Ground

> 10

M

< 50 nH

< 40 pF

< 120 pF

Document Number: 50007

Revision: 13-Jan-11

For technical questions, contact:

sfer@vishay.com

www.vishay.com

RPS 250

Vishay Sfernice

Power Resistor for Mounting onto a Heatsink

Thick Film Technology

PERFORMANCE

TESTS

Momentary Overload

Rapid Temperature Change

Load Life

Humidity (Steady State)

CONDITIONS

NF EN 140000 CEI 115_1

/10 s/U

= 5000 V

NF EN 140000 CEI 68214 Test Na

5 cycles

- 55 °C + 125 °C

NF EN 140000 CEI 115_1

1000 h

at 70 °C

MIL STD 202 Method 103 B and D

56 days R.H. 95 %

REQUIREMENTS

< ± (0.25 % + 0.05

)

< ± (0.25 % + 0.05

)

< ± (0.5 % + 0.05

)

< ± (0.5 % + 0.05

)

RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR

Ohmic Value

Standard Tolerance

Standard TCR (- 55 °C to + 125 °C)

Tolerance On Request



±5%

± 250 ppm/°C

± 1 %/± 2 %/± 10 %

> 1

±5%

± 150 ppm/°C

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).



The fastening of the resistor to the heatsink is under pressure control of four screws (not supplied).

Tightening Torque on Heatsink

RPS 250

3 Nm



In order to improve the dissipation, either forced-air cooling or liquid cooling may be used.

Do not forget to respect an insulation value between two resistors (dielectric strength in dry air 1 kV/mm).

In any case the hot spot temperature, measured locally on the case must not exceed 125 °C.

Test should be performed by the user.

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:

T

P = ----------------------------------------------------------



TH (j - c)

+ R

TH (c - a)



T:

TH (j - c)

TH (c - a)

Example:

TH (c - a)

Expressed in W

Difference between maximum working temperature and room temperature

Thermal resistance value measured between resistive layer and outer side of the resistor. It is the thermal

resistance of the component: (see Environmental Specifications ).

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.

for RPS 250 power dissipation 180 W at + 50 °C room temperature.

T 125

°C - 50 °C



75 °C

T

TH (j - c)

+ R

TH (c - a)

-------

---------

= 0.42 °C/W

180

TH (j - c)

= 0.22 °C/W

TH (c - a)

0.42

°C/W - 0.22 °C/W



0.20 °C/W

For technical questions, contact:

sfer@vishay.com

Document Number: 50007

Revision: 13-Jan-11

www.vishay.com

RPS 250

Power Resistor for Mounting onto a Heatsink

Thick Film Technology

OVERLOADS

In any case the applied voltage must be lower than 2.5

max.

< 2.5

< 12 500 V.

Short time overload:

/10 s

Accidental overload:

The values indicated on the graph

below are applicable to resistors in air or mounted onto a

heatsink.

Vishay Sfernice

POWER RATING

The temperature of the heatsink should be maintained in the

limit specified.

To improve the thermal conductivity, surfaces in contact

should be coated with a silicone grease.

ENERGY CURVE

10 000

100

RATED POWER IN %

-5

-4

-3

-2

-1

1000

ENERGY IN J

0.13

-6

100

120

140

OVERLOAD DURATION IN s

HEATSINK TEMPERATURE IN °C

MARKING

Series, style, ohmic value (in

),

tolerance in %,

manufacturing date, Vishay Sfernice trademark

PACKAGING

Box of 15 units

GLOBAL PART NUMBER INFORMATION

GLOBAL

MODEL

RPS250

STYLE

= Diagonal

connections

= Straight

connections

DIELECTRIC

= Dielectric

strength 12 kV

= Dielectric

strength 7 kV

OHMIC VALUE

The first three digits

are significant figures

and the last digit

specifies the number

of zeros to follow.

R designates decimal

point.

2R20

= 2.20



48R7

= 48.7



47R0

= 47



1001

= 1 k

4R70

= 4.7



R240

= 0.24



TOLERANCE

=1%

=2%

=5%

= 10 %

PACKAGING

= Box, 15 pcs

N/A

(1 to 14 pcs by box)

TYPE

Standard RPS250A

Blank

Standard

RPS250D =

ZA3

Special =

Blank

(for RPS250D) or as

applicable =

ZAx

Document Number: 50007

Revision: 13-Jan-11

For technical questions, contact:

sfer@vishay.com

www.vishay.com

Legal Disclaimer Notice

Vishay

Disclaimer

ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE

RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.

Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,

“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other

disclosure relating to any product.

Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or

the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all

liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,

consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular

purpose, non-infringement and merchantability.

Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical

requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements

about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular

product with the properties described in the product specification is suitable for use in a particular application. Parameters

provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All

operating parameters, including typical parameters, must be validated for each customer application by the customer’s

technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,

including but not limited to the warranty expressed therein.

Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining

applications or for any other application in which the failure of the Vishay product could result in personal injury or death.

Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree

to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and

damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay

or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to

obtain written terms and conditions regarding products designed for such applications.

No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by

any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.

Document Number: 91000

Revision: 11-Mar-11

www.vishay.com

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RPS250D Related Products

	RPS250D	RPS250A
Description	RESISTOR, METAL GLAZE/THICK FILM, 250 W, 1; 2; 5; 10 %, 150; 250 ppm, 0.24 ohm - 1000000 ohm, CHASSIS MOUNT, ROHS COMPLIANT	RESISTOR, METAL GLAZE/THICK FILM, 250 W, 1; 2; 5; 10 %, 150; 250 ppm, 0.24 ohm - 1000000 ohm, CHASSIS MOUNT, ROHS COMPLIANT
Maker	Vishay	Vishay
Reach Compliance Code	unknown	unknown
Other features	RATED AC VOLTAGE (V): 5000	RATED AC VOLTAGE (V): 5000
Installation features	CHASSIS MOUNT	CHASSIS MOUNT
Number of terminals	2	2
Maximum operating temperature	125 °C	125 °C
Minimum operating temperature	-55 °C	-55 °C
Package shape	RECTANGULAR PACKAGE	RECTANGULAR PACKAGE
method of packing	BULK	BULK
Rated temperature	50 °C	50 °C
Resistor type	FIXED RESISTOR	FIXED RESISTOR
surface mount	NO	NO
technology	METAL GLAZE/THICK FILM	METAL GLAZE/THICK FILM
Terminal shape	BINDING POST	BINDING POST

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