Y1680V0374AA0L - Vishay Presicion Group

Ultra High Precision Z-Bulk Metal

Foil Technology Low Profile Conformally Coated

Voltage Divider Resistor with TCR Tracking to 0.1 ppm/°C, Power Coefficient

Tracking of 5 ppm at Rated Power, and Tolerance Match to 0.01 % (100 ppm)

VSH144Z (Z-Foil)

Vishay Foil Resistors

Document Number: 63173 For any questions, contact: foil@vishaypg.com www.foilresistors.com

Revision: 29-Mar-10 1

APPLICATIONS

Instrumentation amplifiers

Bridge networks

Differential amplifiers

Military

Space

Medical

Automatic test equipment

Down-hole (high temperature)

FEATURES



Temperature coefficient of resistance (TCR):

absolute: ± 0.05 ppm/°C typical (0 °C to + 60 °C)

± 0.2 ppm/°C typical (- 55 °C to + 125 °C,

+ 25 °C ref.)

tracking: 0.1 ppm/°C typical

Tolerance: absolute and matching to 0.01 % (100 ppm)

Power coefficient tracking “R due to self heating”: 5 ppm

at rated power

Power rating: 0.2 W at 70 °C, for the entire resistive

element R1 and R2, divided proportionally between the two

values

Load life ratio stability: < 0.01 % (100 ppm) 0.2 W at 70 °C

for 2000 h

Maximum working voltage: 200 V

Resistance range: 100R to 20K per resistive element

Vishay Foil resistors are not restricted to standard

values/ratios; specific “as requested” values/ratios can be

supplied at no extra cost or delivery (e.g. 1K2345 vs. 1K)

Electrostatic discharge (ESD) up to 25 000 V

Non-inductive, non-capacitive design

Rise time: 1 ns effectively no ringing

Current noise: 0.010 µVRMS/V of applied voltage (< - 40 dB)

Thermal EMF: 0.05 µV/°C typical

Voltage coefficient: < 0.1 ppm/V

Non-inductive: < 0.08 µH

Non hot spot design

Thermal stabilization time < 1 s (nominal value achieved

within 10 ppm of steady state value)

Terminal finish: lead (Pb)-free or tin/lead alloy

Compliant to RoHS directive 2002/95/EC

Prototype quantities available in just 5 working days

or sooner. For more information, please contact

foil@vishaypg.com

For better performances please contact us

* Pb containing terminations are not RoHS compliant, exemptions may apply

TABLE 1A - MODEL VSH144Z

SPECIFICATIONS

RESISTANCE

VALUES

ABSOLUTE

TOLERANCE

ABSOLUTE TCR

(- 55 °C to + 125 °C, + 25 °C ref.)

TYPICAL AND MAX. SPREAD



500



to 20 k



± 0.01 % ± 0.2 ppm/°C ± 2.5 ppm/°C

100



to < 500



± 0.02 %

TABLE 1B - MODEL VSH144Z

SPECIFICATIONS

RESISTANCE

RATIO

TOLERANCE

MATCH TCR TRACKING MAX.

1:1 0.01 % 0.5 ppm/°C

> 1:1 to 4:1 0.75 ppm/°C

> 4:1 to 10:1 0.02 % 1.5 ppm/°C

> 10:1 2.0 ppm/°C

VSH144Z

Vout

Vin

VSH144Z (Z-Foil)

Vishay Foil Resistors

www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63173

2Revision: 29-Mar-10

INTRODUCTION

The VSH144Z voltage divider is based on the latest

generation of Bulk Metal® Z-Foil technology which is the

most recommended solution for ultra high precision, stability

and reliable voltage division or anywhere else that requires

two resistors to maintain a stable ratio under power and

throughout all application variables.

Why are extremely low TCR resistors required?

This is a proper question when evaluating system cost. The

answers are as numerous as the system in which they are

installed but a few examples may provide insight:

1) Commercial broadcast equipment heats up through the

day and requires constant manual adjustment through the

day for proper signal adjustment.

2) Satellites in synchronous orbit rotate through temperature

extremes.

3) A fighter jet resting on the 115° desert floor takes off and

reaches altitude at - 60° in less than two minutes.

4) A system that requires fast response time in order to

produce the required signal with minimum stabilization

time.

Resistors may be selected for TCR tracking but that is

only useful when the resistors are operating at the same

temperature. If the resistors are operating at different

temperatures because of differential self-heating, or due

to locally-different thermal influence from different

adjacent components, or because they are operating in

different regions of the equipment, the ratios change

proportional to the differences in operating temperature

times and the absolute TCR in addition to differences in

TCR tracking ratios. Additionally, when resistors within a

set have different absolute TCR’s (individual TCR’s - not

relative or tracking TCR), the ratios change even more

due to the differential self-heating as well as to differential

ambient temperatures:



ratio = (TCR track x



temp 1) + (absolute TCR x



temp 2)

where  temp 1 is the change of ambient temperature

and  temp 2 is the temperature difference between two

resistors due to differential self-heating.

Differential self-heating can occur, for example, when the

same current flows through resistors of different

resistance values. The construction of the VSH144Z

keeps both resistors at the same temperature regardless

of resistance value or differential power.

For best performance in such applications, low absolute

TCRs are required.

What is TCR tracking and why it is important?

TCR tracking is a measure of the uniformity of the

thermally-induced resistance changes in two or more

resistors. Resistors “track” closely when their individual

TCRs are close, and this is a measure of how closely these

resistors will maintain their initial ratios over various

temperature changes. Some resistors may increase in value

with an increase in temperature (positive TCR) while others

will decrease in value with an increase in temperature

(negative TCR), or, they may not change in value at the

same rate (differential TCR). Other temperature effects, such

as self heating due to the application of power can add to the

ambient temperature effects. An example of these effects

can be seen where two resistors with different TCR

characteristics are used around an operation amplifier. The

amplification ratio will be affected by the differential TCR of

the resistors and will be compounded by the differential self

heating effects of the I2R differences of the feedback VS the

input resistor.

Good design practice requires fundamentally low TCR

networks in this application since this would minimize both

varying temperature and self heating effects.

This could not be accomplished with high TCR resistors,

even with good tracking.

What is the reason for such excellent stability?

The secret of Bulk Metal Z-Foil technology’s benchmark

stability lies in the fact that it retains the inherent metallurgical

stability of the alloy from which it is made: the alloy is not

melted and drawn as it is in the manufacture of wirewound

resistors, nor is it evaporated and re-deposited or sputtered

as it is in thin-film resistors. This underlying metallurgical

stability is preserved throughout the manufacturing

processes by preventing the introduction of additional

stresses into the final component.

Our application engineering department is available to

advise and make recommendations. For non-standard

technical requirements and special applications. Please

contact foil@vishaypg.com.

VSH144Z (Z-Foil)

Vishay Foil Resistors

Document Number: 63173 For any questions, contact: foil@vishaypg.com www.foilresistors.com

Revision: 29-Mar-10 3

Note:

• Power is divided proportionally between the 2 values

FIGURE 1 - TRIMMING TO VALUES (conceptual illustration)

Note: Foil shown in black, etched spaces in white

Mutual

Inductance

Reduction due

to Opposing

Current in

Adjacent Lines

Current Path

Before Trimming

Interloop

Capacitance

Reduction

in Series

Trimming Process

Removes this Material

from Shorting Strip Area

Changing Current Path

and Increasing Resistance

Current Path

After Trimming

FIGURE 2 - STANDARD PRINTING AND DIMENSIONS in inches (millimeters)

Dimensional Tolerance: ± 0.010" (0.25)

(1) Lead wires: #22 AWG solder coated copper,

0.75" minimum length

(2) Each divider pair consists of two resistors on one

single chip

(3) For lead (Pb)-free: print “T” after 144Z and “-” after (D.C.)

Model VSH144Z and Schematic

(2)

0.263 ± 0.02

(6.7 ± 0.5)

VSH

144Z T

0.100

(2.54)

0.200

(5.08)

0.098 + 0.008/- 0.01

(2.5 + 0.2/- 0.3)

1.0 (25.4)

Min.

(D.C.) -

1K/1K 0.283 ± 0.04

(7.2 ± 1.0)

(3)

FIGURE 3 - POWER DERATING CURVE

100 %

75 %

50 %

25 %

- 75 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175

Ambient Temperature (°C)

Percent of Rated Power at + 70 °C

- 55 °C + 70 °C

Recommended

operation for

< 150 ppm ΔR

after 2000 h

load life

Rated Power

FIGURE 4 - TYPICAL RESISTANCE/

TEMPERATURE CURVE

(for more details see table 1A)

+ 500

+ 200

+ 100

- 100

- 200

- 300

- 500

- 55 - 25 + 25 + 60 + 75 + 100 + 125

Ambient Temperature (°C)

ΔR

(ppm)

0.05 ppm/°C

- 0.1 ppm/°C 0.1 ppm/°C

0.14 ppm/°C

0.2 ppm/°C

- 0.16 ppm/°C

- 400

+ 300

+ 400

TCR Chord Slopes for Different Temperature Ranges

VSH144Z (Z-Foil)

Vishay Foil Resistors

www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63173

4Revision: 29-Mar-10

Note

• A combination of these values are available in reverse order and in values up to 5 digits

TABLE 2 - EXAMPLES OF VCODES FOR POPULAR VALUES (other values available on request)

VSH144Z RATIOS

VCODES R1R2VCODES R1R2

V0009 20K 20K V0058 2K 20K

V0010 20K 10K V0030 2K 18K

V0100 20K 2K V0029 2K 4K

V0055 19K4 9K7 V0059 2K 2K

V0223 17K5 20K V0103 2K 3K

V0097 15K 15K V0154 1K5 3K

V0001 10K 10K V0032 1K 16K

V0042 10K 8K323 V0121 1K 2K

V0006 10K 2K V0004 1K 1K

V0166 10K 15K V0379 1K 7K

V0226 9K 10K V0374 800R 800R

V0003 9K 1K V0022 511R 16K2

V0013 8K 16K V0091 500R 500R

V0107 6K 20K V0162 500R 15K

V0014 6K 7K V0378 500R 4K5

V0160 6K 6K V0061 300R 300R

V0159 5K5 7K7 V0088 100R 100R

V0005 5K 10K V0380 100R 15K

V0002 5K 5K V0375 100R 12K3

V0373 4K 12K V0381 100R 50R

V0026 3K 19K2 V0377 50R 28K

V0156 3K 6K V0376 35R 20K

V0158 2K7 10K - - -

VSH144Z (Z-Foil)

Vishay Foil Resistors

Document Number: 63173 For any questions, contact: foil@vishaypg.com www.foilresistors.com

Revision: 29-Mar-10 5

Note

(1) For non-standard requests, please contact application engineering

TABLE 3 - GLOBAL PART NUMBER INFORMATION (1)

NEW GLOBAL PART NUMBER: Y1680V0058QT9L (preferred part number format)

DENOTES PRECISION VCODE TOLERANCE MATCH PACKAGING

YRESISTANCE

VALUE CODE

V= 0.005 %

T= 0.01 %

Q= 0.02 %

A= 0.05 %

B= 0.1 %

D= 0.5 %

F= 1.0 %

L = bulk pack

PRODUCT CODE RESISTANCE TOLERANCE CHARACTERISTICS

1680 = VSH144Z V= ± 0.005 %

T= ± 0.01 %

Q= ± 0.02 %

A= ± 0.05 %

B= ± 0.1 %

D= ± 0.5 %

F= ± 1.0 %

0 = standard

9 = lead (Pb)-free

1 to 999 = custom

FOR EXAMPLE: ABOVE GLOBAL ORDER Y1680 V0058 Q T 9 L:

TYPE: VSH144Z

VALUES: 2K/20K

ABSOLUTE TOLERANCE: ± 0.02 %

TOLERANCE MATCH: 0.01 %

TERMINATION: lead (Pb)-free

PACKAGING: bulk pack

HISTORICAL PART NUMBER: VSH144ZT 2K/20K TCR0.2 Q T B (will continue to be used)

VSH144Z T 2K/20K TCR0.2 Q T B

MODEL TERMINATION OHMIC VALUE

TCR

CHARACTERISTIC

ABSOLUTE

TOLERANCE

MATCH PA CK A G I N G

VSH144Z T = lead (Pb)-free

None = tin/lead alloy

R1= 2 k

R2= 20 k

V= ± 0.005 %

T= ± 0.01 %

Q= ± 0.02 %

A= ± 0.05 %

B= ± 0.1 %

D= ± 0.5 %

F= ± 1.0 %

V= 0.005 %

T= 0.01 %

Q= 0.02 %

A= 0.05 %

B= 0.1 %

D= 0.5 %

F= 1.0 %

B = bulk pack

680V 0580Y1 T9Q L

Vishay Precision Group

Document No.: 63999

Revision: 27-Apr-11

www.vishaypg.com

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Document No.: 63999

Revision: 27-Apr-11