NEW
Ultra High Precision Z-Foil Resistor with TCR of ± 0.05 ppm/°C,
Tolerance of ± 0.005 % (50 ppm), Load Life Stability of ± 0.005 %,
ESD Immunity up to 25 kV and Thermal EMF of 0.05 µV/°C
Z Series (Z-Foil)
Vishay Foil Resistors
Document Number: 63187 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 21-Jul-10 1
INTRODUCTION
The Bulk Metal® Foil resistor is based on a special concept
where a proprietary bulk metal cold rolled foil is cemented to
a ceramic substrate. It is then photoetched into a resistive
pattern. Furthermore, it is laser adjusted to any desired value
and tolerance. Because the metals used are not drawn,
wound or mistreated in any way during manufacturing
process, the Bulk Metal Foil resistor maintains all its design,
physical and electrical characteristics while winding of wire
or sputtering does not. Z foil resistors achieve maximum
stability and near-zero TCR. These performance
characteristics are built-in for every unit, and do not rely on
screening or other artificial means for uniform performances.
The stability of a resistor depends primarily on its history of
exposures to temperature. Stability is affected by:
1. Changes in the ambient temperature and heat from
adjacent components (defined by the Temperature
Coefficient of Resistance, or TCR)
2. Destabilizing thermal shock of suddenly-applied power
(defined by the power coefficient, or PCR)
3. Long-term exposure to applied power (load-life stability)
4. Repetitive stresses from being switched on and off
In very high-precision resistors, these effects must be taken
into account to achieve high stability with changes in load
(Joule Effect) and ambient temperature.
Vishay’s new Z-Foil technology provides an order of
magnitude reduction in the Bulk Metal Foil element’s
sensitivity to temperature changes - both external and
internal. This technology provides an absolute TCR of
± 0.05 ppm/°C typical (instrument range: 0 °C to +60 °C),
± 0.2 ppm/°C typical (military range: - 55 °C to + 125 °C,
+ 25 °C ref), and a PCR of 5 ppm at rated power.
In order to take full advantage of this TCR improvement, it is
necessary to take into account the differences in the
resistor’s response to each of the above-mentioned effects.
The Z series has been developed to successfully deal with
these factors.
TABLE 1 -
TYPICAL TCR AND MAX. SPREAD
(- 55 °C to + 125 °C, + 25 °C ref.)
VALUE STANDARD
TOLERANCE
TYPICAL TCR AND
MAX. SPREAD
(ppm/°C)
100 Ω to 600 KΩ± 0.005 % ± 0.2 ± 0.6
80 Ω to < 100 Ω± 0.005 % ± 0.2 ± 0.8
50 Ω to < 80 Ω± 0.01 % ± 0.2 ± 1.0
25 Ω to < 50 Ω± 0.01 % ± 0.2 ± 1.3
10 Ω to < 25 Ω± 0.02 % ± 0.2 ± 1.6
FEATURES
•Temperature coefficient of resistance (TCR):
- ± 0.05 ppm/°C typical (0 °C to + 60 °C)
- ± 0.2 ppm/°C typical (- 55 °C to + 125 °C,
+ 25 °C ref.) (see table 1)
•Rated power: to 1 W at + 125 °C
•Resistance tolerance: to ± 0.005 % (50 ppm)
•Load life stability: to ± 0.005 % at 70 °C, 2000 h or to
±0.015% at 70°C,10000 h (see table 4)
•Resistance range: 10 Ω to 600 kΩ
•Vishay Foil Resistors are not restricted to standard values;
specific “as required” values can be supplied at no extra
cost or delivery (e.g. 1K2345 vs. 1K)
•Total accumulated change in resistance over life (EOL)
< 0.05 % (or better with PMO)
•Electrostatic discharge 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
•Low inductance: < 0.08 µH typical
•Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
•Pattern design minimizing hot spots
•Terminal finish: lead (Pb)-free or tin/lead alloy
•Matched sets are available per request
(TCR tracking: to 0.5 ppm/°C)
•Prototype quantities available in just 5 working days
or sooner. For more information, please contact
foil@vishaypg.com
•Load life ΔR maximum can be reduced significantly
with our post manufacturing operations (PMO) see
page 4 for details
FIGURE 1 - TYPICAL RESISTANCE/
TEMPERATURE CURVE (Z-FOIL)
+ 500
+ 200
+ 100
0
- 100
- 200
- 300
- 500
- 55 - 25 + 25 + 60 + 75 + 100 + 125
Ambient Temperature (°C) and TCR Chord Slopes
for Different Temperature Ranges
ΔR
R
(ppm)
0
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
* Pb containing terminations are not RoHS compliant, exemptions may apply
FIGURE 2 - STANDARD IMPRINTING AND DIMENSIONS
LS
Model Number
VISHAY
XXXX
ST1)
H
L
Date Code
W
Front View Rear View
Lead Material #22 AWG
Round Solder Coated Copper
Optional Customer Part Number
Print specification, etc. if required
Resistance
Value Code
Tolerance
XXXXXX
100R01
0.01 %
LL
SW
10
Week
10
Year
Z201
Note
1. The standoffs shall be so located as to give a lead clearance of 0.010" minimum between the resistor body and the printed circuit board
when the standoffs are seated on the printed circuit board. This is to allow for proper cleaning of flux and other contaminants from the unit
after all soldering processes.
TABLE 2 - MODEL SELECTION
MODEL
NUMBER
RESISTANCE
RANGE (2)
(Ω)
MAXIMUM
WORKING
VOLTAGE
AMBIENT
POWER RATING AVERAGE
WEIGHT
(g)
DIMENSIONS
at
+ 70 °C
at
+ 125 °C INCHES mm
Z201
(Z201L) (1) 10R to 100K 300 0.6 W 0.3 W 0.6
W: 0.105 ± 0.010
L: 0.300 ± 0.010
H: 0.326 ± 0.010
ST: 0.010 min.
SW: 0.035 ± 0.010
LL: 1.000 ± 0.125
LS: 0.150 ± 0.005
2.67 ± 0.25
7.62 ± 0.25
8.28 ± 0.25
0.254 min.
1.02 ± 0.13
25.4 ± 3.18
3.81 ± 0.13
Z204 10R to 200K 350 1.0 W 0.5 W 1.4
W: 0.160 max.
L: 0.575 max.
H: 0.413 max.
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.400 ± 0.020
4.06 max.
14.61 max.
10.49 max.
0.889 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
10.16 ± 0.51
Z205 10R to 300K 350 1.5 W 0.75 W 1.9
W: 0.160 max.
L: 0.820 max.
H: 0.413 max.
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.650 ± 0.020
4.06 max.
20.83 max.
10.49 max.
0.889 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
16.51 ± 0.51
Z206 10R to 600K 500
2.0 W 1.0 W
4.0
W: 0.260 max.
L: 1.200 max.
H: 0.413 max.
ST: 0.035 ± 0.005
SW: 0.050 ± 0.005
LL: 1.000 ± 0.125
LS: 0.900 ± 0.020
6.60 max.
30.48 max.
10.49 max.
0.889 ± 0.13
1.27 ± 0.13
25.4 ± 3.18
22.86 ± 0.51
up to 400K
1.0 W 0.5 W
over 400K
Z Series (Z-Foil)
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63187
2Revision: 21-Jul-10
Note
(1) 0.200" (5.08 mm) lead spacing available - specify Z201L for Z201.
(2) for non standard values please contact Application Engineering Department at foil@vishaypg.com
FIGURE 3 - POWER DERATING CURVE
100
75
50
25
0
- 75 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175 + 200
Ambient Temperature (°C)
Rated Power (%) at + 70 °
- 55 °C + 70 °C
Rated Power
Recommended
operation for
< 150 ppm ΔR
after 2000 h
load life
Z Series (Z-Foil)
Vishay Foil Resistors
Document Number: 63187 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 21-Jul-10 3
FIGURE 4 - TRIMMING TO VALUES
(conceptual illustration)
Mutual Inductance
Reduction due
to Change in
Current Direction
Current Path
Before Trimming
Note: Foil shown in black, etched spaces in white
Interloop Capacitance
Reduction in Series
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
Current Path
After Trimming
TABLE 3 - ENVIRONMENTAL PERFORMANCE COMPARISON
MIL-PRF-55182
CHAR J
Z SERIES
TYPICAL ΔR
Z SERIES
MAXIMUM ΔR
Test Group I
Thermal shock, 5 x (- 65 °C to + 150 °C) ± 0.2 % ± 0.002 % (20 ppm) ± 0.01 % (100 ppm)
Short time overload, 6.25 x rated power ± 0.2 % ± 0.003 % (30 ppm) ± 0.01 % (100 ppm)
Test Group II
Resistance temperature characteristics ± 25 ppm/°C ± 0.05 ppm/°C see table 1
Low temperature storage (24 h at - 65 °C) ± 0.15 % ± 0.002 % (20 ppm) ± 0.01 % (100 ppm)
Low temperature operation
(45 min, rated power at - 65 °C) ± 0.15 % ± 0.002 % (20 ppm) ± 0.01 % (100 ppm)
Terminal strength ± 0.2 % ± 0.002 % (20 ppm) ± 0.01 % (100 ppm)
Test Group III
DWV ± 0.15 % ± 0.002 % (20 ppm) ± 0.01 % (100 ppm)
Resistance to solder heat ± 0.1 % ± 0.005 % (50 ppm) ± 0.01 % (100 ppm)
Moisture resistance ± 0.4 % ± 0.01 % (100 ppm) ± 0.05 % (500 ppm)
Test Group IV
Shock ± 0.2 % ± 0.002 % (20 ppm) ± 0.01 % (100 ppm)
Vibration ± 0.2 % ± 0.002 % (20 ppm) ± 0.01 % (100 ppm)
Test Group V
Life test at 0.3 W/+ 125 °C
2000 h ± 0.5 % ± 0.005 % (50 ppm) ± 0.015 % (150 ppm)
10 000 h ± 2.0 % ± 0.015 % (150 ppm) ± 0.05 % (500 ppm)
Test Group Va
Life test at 0.6 W (2 x rated power)/+ 70 °C, 2000 h ± 0.5 % ± 0.005 % (50 ppm) ± 0.015 % (150 ppm)
Test Group VI
High temperature exposure (2000 h at + 175 °C) ± 2.0 % ± 0.05 % (500 ppm) ± 0.1 % (1000 ppm)
Test Group VII
Voltage coefficient 5 ppm/V < 0.1 ppm/V < 0.1 ppm/V
Z Series (Z-Foil)
Vishay Foil Resistors
www.foilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63187
4Revision: 21-Jul-10
STANDARD OPERATIONS AND TEST
CONDITIONS
A. Standard Test Operations:
By 100 % Inspection
•Short-time overload (6.25 x rated power for 5 s)
•Resistance - tolerance check
•Visual and mechanical
By Sample Inspection
•TCR
•Environmental tests per table 3 on a quarterly basis
to establish performance by similarity
B. Standard Test Conditions:
•Lead test point: 0.5" (12.7 mm) from resistor body
•Temperature: + 23 °C ± 2 °C
•Relative humidity: per MIL-STD-202
POST MANUFACTURING OPERATIONS OR
PMO
Many analog applications can include requirements for
performance under conditions of stress beyond the normal
and over extended periods of time. This calls for more than
just selecting a standard device and applying it to a circuit.
The standard device may turn out to be all that is needed but
an analysis of the projected service conditions should be
made and it may well dictate a routine of stabilization known
as post manufacturing operations or PMO. The PMO
operations that will be discussed are only applicable to Bulk
Metal Foil resistors. They stabilize Bulk Metal Foil resistors
while they are harmful to other types. Short time overload,
accelerated load life, and temperature cycling are the three
PMO exercises that do the most to remove the anomalies
down the road. Vishay Bulk Metal Foil resistors are
inherently stable as manufactured. These PMO exercises
are only of value on Bulk Metal Foil resistors and they
improve the performance by small but significant amounts.
Users are encouraged to contact Vishay Foil applications
engineering for assistance in choosing the PMO operations
that are right for their application.
TABLE 4 - “Z” SERIES SPECIFICATIONS
Stability (1)
Load life at 2000 h ± 0.015 % (150 ppm) Maximum ΔR at 0.3 W/+ 125 °C
± 0.005 % (50 ppm) Maximum ΔR at 0.1 W/+ 70 °C
Load life at 10 000 h ± 0.05 % (500 ppm) Maximum ΔR at 0.3 W/+ 125 °C
± 0.01 % (100 ppm) Maximum ΔR at 0.1 W/+ 70 °C
Current Noise 0.010 µVRMS/V of applied voltage (< - 40 dB)
High Frequency Operation
Rise time 1.0 ns at 1 kΩ
Inductance (L) (2) 0.1 µH maximum; 0.08 µH typical
Capacitance (C) 1.0 pF maximum; 0.5 pF typical
Voltage Coefficient < 0.1 ppm/V (3)
Thermal EMF (4) 0.05 µV/°C typical
1 µV/W (Model Z201)
Notes
(1) Load life ΔR maximum can be reduced by 80 %, please contact applications engineering department.
(2) Inductance (L) due mainly to the leads.
(3) The resolution limit of existing test equipment (within the measurement capability of the equipment, or “essentially zero”.)
(4) µV/°C relates to EMF due to lead temperature difference and µV/watt due to power applied to the resistor.
TABLE 5 - GLOBAL PART NUMBER INFORMATION (1)
NEW GLOBAL PART NUMBER: Y145380K5000V9L (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS
Y R = Ω
K = kΩ
M = MΩ
0 = standard
9 = lead (Pb)-free
1 to 999 = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
1453 = Z201
1454 = Z201L
1441 = Z204
1443 = Z205
1447 = Z206
V = ± 0.005 %
T = ± 0.01 %
Q = ± 0.02 %
A = ± 0.05 %
B = ± 0.1 %
C = ± 0.25 %
D = ± 0.5 %
F = ± 1.0 %
L = bulk pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1453 80K5000 V 9 L:
TYPE: Z201
VALUE: 80.5 kΩ
ABSOLUTE TOLERANCE: ± 0.005 %
TERMINATION: lead (Pb)-free
PACKAGING: bulk pack
HISTORICAL PART NUMBER: Z201 T 250R00 V B (will continue to be used)
Z201 T250R00 V B
MODEL TERMINATION RESISTANCE VALUE TOLERANCE PACKAGING
Z201
Z201L
Z204
Z205
Z206
T = lead (Pb)-free
None = tin/lead alloy
250R00 = 250.00 Ω
5K2310 = 5.231 kΩ
1M000 = 1 MΩ
V = ± 0.005 %
T = ± 0.01 %
Q = ± 0.02 %
A = ± 0.05 %
B = ± 0.1 %
C = ± 0.25 %
D = ± 0.5 %
F = ± 1.0 %
B = bulk pack
Z Series (Z-Foil)
Vishay Foil Resistors
Document Number: 63187 For any questions, contact: foil@vishaypg.com www.foilresistors.com
Revision: 21-Jul-10 5
Note
(1) For non-standard requests, please contact application engineering.
4538 K500Y1 V90 L0
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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Document No.: 63999
Revision: 27-Apr-11
