303139-68R-E-B-T datasheet, PDF

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303139-68R-E-B-T: DescriptionFixed Resistor, Metal Foil, 0.25W, 68ohm, 47V, 0.2% +/-Tol, -.2,.2ppm/Cel, 2412; CategoryPassive components The resistor; File Size503KB，7 Pages; ManufacturerVishay; Websitehttp://www.vishay.com

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303139-68R-E-B-T Overview

Fixed Resistor, Metal Foil, 0.25W, 68ohm, 47V, 0.2% +/-Tol, -.2,.2ppm/Cel, 2412

303139-68R-E-B-T Parametric

Parameter Name	Attribute value
Is it lead-free?	Contains lead
Is it Rohs certified?	incompatible
Maker	Vishay
package instruction	SMT, 2412
Reach Compliance Code	compliant
ECCN code	EAR99
Is Samacsys	N
structure	Molded Chip
Manufacturer's serial number	303139
Number of terminals	2
Maximum operating temperature	125 °C
Minimum operating temperature	-55 °C
Package height	2.49 mm
Package length	5.99 mm
Package form	SMT
Package width	3.2 mm
method of packing	TR
Rated power dissipation(P)	0.25 W
Guideline	MIL-PRF-55182
resistance	68 Ω
Resistor type	FIXED RESISTOR
series	303139
size code	2412
technology	METAL FOIL
Temperature Coefficient	-.2,.2 ppm/°C
Tolerance	0.2%
Operating Voltage	47 V
Base Number Matches	1

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303139, 303140

Vishay Foil Resistors

Models # 303139 and 303140 - Molded Surface Mount Space and Military

Grade Resistors SMRxDZ with Screen/Test Flow in Compliance with

EEE-INST-002, (Tables 2A and 3A, Film/Foil, Level 1) and MIL-PRF-55182

FEATURES

•

Temperature coefficient of resistance (TCR):

± 0.2 ppm°C typical (- 55 °C to + 125 °C, + 25 °C ref.)

•

Tolerance: to ± 0.02 %

•

Power coefficient of resistance (PCR)

“ΔR due to self heating”: 5 ppm at rated power

•

Flexible terminations ensure minimal stress transference

from the PCB due to a difference in thermal coefficient of

expansions (TCE)

•

Electrostatic discharge (ESD) up to 25 000 V

•

Load life stability: ± 0.005 % (70 °C, 2000 h at rated power)

•

Resistance range: 5

to 40 kΩ

•

Vishay Foil resistors are not restricted to standard values;

specific “as requested” values can be supplied at no extra

cost or delivery (e.g. 1K2345 vs. 1K)

•

Maximum power: to 600 mW at 70 °C

•

Non-inductive, non-capacitive design

•

Current noise: - 40 dB

•

Voltage coefficient: < 0.1 ppm/V

•

Non-inductive: < 0.08 µH typical

•

Non hot spot design

•

Terminal finish: tin/lead alloy

•

Matched sets with TCR tracking are available upon

request

•

For oriented performances please contact us

•

For prototype units, append a “U” to the model number

(example: 303139U). These units pass all tests per table 3

(page 4) with no destructive qualification testing required

(table 4, page 4). For more information, please contact

foil@vishaypg.com

INTRODUCTION

The 303139, 303140 are ultra high precision molded surface

mountable resistors offering all the elements of precision;

including low TCR, tight tolerance, long term stability, low

noise, low thermal EMF, and non-measurable voltage

coefficient. One of the important parameters influencing

stability is the temperature coefficient of resistance (TCR).

Although the TCR of foil resistors is considered extremely

low, this characteristic has been further refined over the

years. These resistors utilize ultra high precision Bulk Metal

Z-Foil.

The Z-Foil technology provides a significant reduction of

the resistive element’s sensitivity to ambient temperature

variations (TCR) and to self heating when power is applied

(power coefficient).

Voltage division with tight tracking < 2 ppm/°C can be

achieved with 2

randomly

selected units even with a large

ratio between the two values.

Our application engineering department is available to

advise and make recommendations.

TABLE 1 - TOLERANCE AND TCR VS.

RESISTANCE VALUE

(- 55 °C to + 125 °C, + 25 °C ref.)

VALUE

250

to 40 kΩ

to < 250

to < 50

to < 20

to < 10

ABSOLUTE

TOLERANCE

± 0.02 %

± 0.05 %

± 0.1 %

± 0.2 %

± 0.5 %

TYPICAL TCR AND

MAX. SPREAD

(ppm/°C)

± 0.2 ± 1.8

± 0.2 ± 2.8

± 0.2 ± 4.8

± 0.2 ± 6.8

FIGURE 1 - POWER DERATING CURVE

200

175

Rated Power (%)

150

125

100

- 75

- 25

+ 25

+ 75

+ 125

Ambient Temperature (°C)

+ 175

- 55 °C

+ 70 °C

Document Number: 63165

Revision: 27-Jul-10

For any questions, contact:

foil@vishaypg.com

www.foilresistors.com

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