RPS250L250U2ZA3B015E [VISHAY]

Power Resistor for Mounting onto a Heatsink Thick Film Technology; 功率电阻安装在散热片厚膜工艺


型号：	RPS250L250U2ZA3B015E
厂家：	VISHAY
描述：	Power Resistor for Mounting onto a Heatsink Thick Film Technology 功率电阻安装在散热片厚膜工艺散热片
文件：	总4页 (文件大小：110K)
中文：	中文翻译
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RPS 250

Vishay Sfernice

Power Resistor for Mounting onto a Heatsink

Thick Film Technology

FEATURES

• High power rating: 250 W

RoHS

• High overload capability up to 4 times Nominal

COMPLIANT

Power (see energy curve)

• Easy mounting

• Low thermal radiation of the case

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 millimeters

RPS 250D

16ꢀ5

Ø 7ꢀ2

Ø 4ꢀ2

2 M4 USEFUL DEPTH: 8

• Tolerance unless stated: 0ꢀ2 mm

MECHANICAL SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

Mechanical Protection

Substrate

Insulated case

Resistance Range

0.24

to 1M E24 series

Alumina onto

aluminum base

Cermet

Screws M4, (M5 on

request)

Tolerances

1 % to 10 %

Power Rating chassis mounted

Resistive Element

End Connections

250 W

at 50 °C continuous

1000 W

at 25 °C for 10 seconds

Temperature Coefficient

Standard

250 ppm/°C < 1

150 ppm/°C > 1

Tightening Torque on connections 2 Nm

Weight

170 g 10 %

Limiting Element Voltage

Dielectric Strength

5 kVRMS

L connections 7 kVRMS

MIL STD 202 (301), 1 minute, 10 mA Max H connections 12 kVRMS

ENVIRONMENTAL SPECIFICATIONS

Insulation Resistance

Inductance

> 10⁶M

Thermal Resistance

Temperature Range

Climatic Category

RTH (j-c) 0.22 °C/W

- 55 °C + 125 °C

55/125/56

< 50 nH

Capacitance Resistor/

ground

< 40 pF

< 120 pF

Document Number: 50007

Revision: 08-Jun-06

For technical questions, contact: sfer@vishay.com

www.vishay.com

RPS 250

Power Resistors for Mounting onto a Heatsink

Thick Film Technology

Vishay Sfernice

PERFORMANCE

TESTS

CONDITIONS

TYPICAL DRIFTS

NF EN 140 000 CEI 115_1

4 Pr/10 s

Momentary Overload

(0.25 % + 0.05 Ω)

NF EN 140 000 CEI 68214 Test Na

5 cycles

Rapid Temperature Change

(0.25 % + 0.05 Ω)

- 55 °C + 125 °C

NF EN 140 000 CEI 115_1

1000 h Pr at 70 °C

Load Life

(0.5 % + 0.05 Ω)

MIL STD 202 Method 103 B and D

56 days R.H. 95 %

Humidity (steady state)

RESISTANCE VALUE IN RELATION TO TOLERANCE AND TCR

Ohmic Value

< 1 Ω

> 1 Ω

5 %

Standard Tolerance

Standard TCR

5 %

250 ppm/°C

150 ppm/°C

Tolerance On Request

1 % - 2 % - 10 %

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:

(1)

ΔT

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

P =

[R^TH(j – c) + RTH (c – a)]

expressed in W

difference between maximum working temperature and room temperature.

R^TH:

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

resistance of the component: (see specifications environmental paragraph).

R^TH:

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

It is the thermal resistance of the heatsink itself (type, shape) and the quality of the fastening device.

Example:

RTH: (c-a) for RPS 250 power dissipation 180 W at + 50 °C room temperature.

ΔT ≤ 125 °C - 50 °C ≤ 75 °C

ΔT

---------

= 0.42 °C/W

-------

TH (j-c) + RTH (c-a) =

TH (j-c) = 0.22 °C/W

180

TH (c-a) ≤ 0.42 °C/W - 0.22 °C/W ≤ 0.20 °C/W

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 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 two screws (tightening torque 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.

www.vishay.com

For technical questions, contact: sfer@vishay.com

Document Number: 50007

Revision: 08-Jun-06

RPS 250

Power Resistor for Mounting onto a Heatsink

Thick Film Technology

Vishay Sfernice

OVERLOADS

In any case the applied voltage must be lower than 2.5 Un. U maxi < 2.5 Un < 12 500 V.

Short time overload: 4 Pn/10 seconds

Accidental overload: The values indicated on the graph below are applicable to resistors in air or mounted onto a heatsink.

ENERGY CURVE

10 000

1000

100

0ꢀ13

1 µs

10 µs

100 µs

1 ms

10 ms

100 ms

1 s

OVERLOAD DURATION IN SECONDS

POWER RATING CHART

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.

100

Packaging Box of 15 units

100

120

140

HEATSINK TEMPERATURE IN DEGREES CELSIUS

MARKING

Series, style, ohmic value (in Ω), tolerance in %, manufacturing date, VISHAY trademark

ORDERING INFORMATION

RPS

250

250U

1 %

ZA3

B015

MODEL STYLE

CONNECTIONS

Optional

H: dielectric strength 12 kV

L: dielectric strength 7 kV

RESISTANCE VALUE TOLERANCE CUSTOM DESIGN PACKAGING

LEAD

(Pb)-FREE

Optional

1 %

Options on request

special TCR,

2 %

5 %

shape, etc.

10 %

SAP PART NUMBERING GUIDELINES

RPS

0250

2500

ZA3

MODEL

STYLE

CONNECTIONS

OHMIC VALUE

TOLERANCE

PACKAGING

DESIGN

Document Number: 50007

Revision: 08-Jun-06

For technical questions, contact: sfer@vishay.com

www.vishay.com

Legal Disclaimer Notice

Vishay

Notice

Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,

or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.

Information contained herein is intended to provide a product description only. No license, express or implied, by

estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's

terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express

or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness

for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.

The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.

Customers using or selling these products for use in such applications do so at their own risk and agree to fully

indemnify Vishay for any damages resulting from such improper use or sale.

Document Number: 91000

Revision: 08-Apr-05

www.vishay.com

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