FIGURE 1 - TRIMMING CHIP RESISTORS
V5X5Z
V15X5Z
Gold Plated Pads
Trim Points
Gold Plated Pads
FIGURE 2 - POWER DERATING CURVE
Discrete chips suitable for working temperatures of up to
+ 200 °C are available on request.
100
75
50
25
0
- 75 - 50 - 25 0 + 25 + 50 + 75 + 100 + 125 + 150 + 175
Ambient Temperature (°C)
Rated Power (%)
+ 70 °C
- 55 °C
Ultra High Precision Bulk Metal® Z-Foil Chip Resistors for Use
in Hybrid Circuits with TCR of 0.05 ppm/°C, Tolerance to 0.005 %,
and Load Life Stability of ± 0.01 % for 10 000 h
V5X5Z, V15X5Z (Z-Foil)
Vishay Foil Resistors
Document Number: 63189 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 13-Jan-11 1
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.)
TCR tracking: to 0.5 ppm/°C (1)(2)
•TCR characteristic is accomplished automatically
without selection and regardless of the date of
manufacture - even if years apart
•Hybrid chips with Z-Foil are also available for high
temperature applications, please contact us for more
details
•Resistance tolerance:
Absolute: to ± 0.01 % (user trimmable to ± 0.005 %)
Match: to 0.01 %
•Power rating: 50 mW to 150 mW at + 70 °C
•Load life stability: ± 0.01 % at + 70 °C, 10 000 h at rated
power
•Resistance range: 50 Ω to 30 kΩ (see table 2)
•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)
•Short time overload: ≤ 0.02 %
•Electrostatic discharge (ESD) up to 25 000 V
•Non-inductive, non-capacitive design
•Rise time: 1 ns effectively no ringing
•Thermal stabilization time < 1 s (nominal value achieved
within 10 ppm of steady state value)
•Current noise: 0.010 µVRMS/V of applied voltage (< - 40 dB)
•Non-inductive: < 0.08 µH
•Pattern design minimizing hot spots
The typical pattern and trimming illustrations show that the
V5X5Z resistor has 16 trimming points, and the V15X5Z has
20. These trimming points are arranged around the chip
periphery and are clearly indicated. Trimming to the desired
resistance value and tolerance is accomplished by cutting
the trim points, thereby producing specific incremental
changes in the chip’s resistance value relative to the original
prevalue; up to + 20 % for the V5X5Z, + 30 % for the
V15X5Z (not all trim points need be used; the
Δ
R necessary
to adjust the pre-value to the desired final value dictates
which trim points need to be used).
Monitoring of circuit output while “actively” trimming readily
permits adjustment of the chip to ± 0.005 %.
Actual trimming charts are supplied on request for all
images.
Vishay precision chip resistors offer an order of magnitude
of improvement over other chip resistors in hybrid
applications. With a maximum Temperature Coefficient of
Resistance (TCR) of ± 2 ppm/°C, selected TCR tracking to
0.5 ppm/°C and factory supplied resistance tolerances to
± 0.01 %, they provide the user with accuracy and stability
not available in other chip resistor products. If desired they
can be user trimmed to any value within ± 0.005 %, where
the v
alue remains stable after trimming. Load life stability is
0.05 % ΔR maximum under full rated power for 2000 h at
+ 70 °C.
The Vishay precision trimming system allows for adjustment
to precise resistance values without concern over
mechanical override and control problems encountered in
laser or air abrade trimming of solid geometry resistance
patterns. This ability to trim resistor chips to tolerance levels
never before available to hybrid manufacturers, now gives a
project manager the ability to increase the value-added level
of their hybrid services. More of the profit thus available can
be retained within the facility. Now, instead of buying
precision resistors in separate packages or modules (which
require additional PC board real estate) and integrating them
into a system, the project manager can utilize Vishay
precision resistor chips or matched sets to manufacture the
entire hybrid circuit in-house. Eliminates the need to “pin-out”
for precision resistor requirements because the precision
resistors are inside - part of the hybrid microcircuit design.
Vishay precision chip resistors are available either factory-
trimmed to exact resistance values (option T) or ready for
user trimming (option U); user trimming can be done either
before or after bonding - using standard epoxies - onto the
hybrid circuit substrate using standard laser, air abrade, or
manual adjustment techniques. However care should be
taken that no carbonization occurs when laser trimming.
TABLE 1 - TOLERANCE AND TCR VS. RESISTANCE VALUE(1)
VALUE
(Ω)
STANDARD TOLERANCE
(%)
TYPICAL TCR AND MAX SPREAD
- 55 °C to + 125 °C, + 25 °C Ref. (ppm/°C)(2)
500 to 30K ± 0.01
± 0.2 ± 1.8
100 to < 500 ± 0.02
50 to < 100 ± 0.02 ± 0.2 ± 2.8
V5X5Z, V15X5Z (Z-Foil)
Vishay Foil Resistors
www.vishayfoilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63189
2Revision: 13-Jan-11
Note
(1) For tighter performances or high temperature applications, please contact application engineering.
(2) The TCR results show 4 terminal measurements. To view TCR results for 2 terminal measurements and for different gold wire lengths, refer
to the nomogram on page 6.
FIGURE 4 - DIMENSIONS
in inches (millimeters)
0.020 ± 0.005
(0.508 ± 0.127)
0.150 ± 0.005
(3.81 ± 0.127)
0.050 ± 0.005
(1.27 ± 0.127)
+ 0.001
- 0.004
+0.025
- 0.102
0.019
0.483
( )
0.005 ± 0.004
(1.27 ± 0.102) + 0.001
- 0.004
+0.025
- 0.102
0.029
0.737
( )
0.050 ± 0.005
(1.27 ± 0.127)
0.050 ±0.005
(1.27 ±0.127)
0.034
(0.864)
Nominal
0.008
(0.203)
Nominal
0.008
(0.203)
Nominal
Square
0.008
(0.203)
Nominal
0.020 ± 0.005
(0.508 ± 0.127)
V15X5Z
V5X5Z
FIGURE 3 - Z-FOIL TYPICAL RESISTANCE/ TEMPERATURE CURVE
+ 500
+ 200
+ 100
0
- 100
- 200
- 300
- 500
- 55 - 25 + 25 + 60 + 75 + 100 + 125
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
Ambient Temperature (°C) and TCR Chord Slopes for
Different Temperature Ranges
TABLE 2 - PRECISION CHIP RESISTOR SPECIFICATIONS
Resistance range 50 Ω to 5 kΩ (model V5X5Z)
50 Ω to 30 kΩ (model V15X5Z)
TCR
(- 55 °C to + 125 °C, + 25 °C Ref. (ppm/°C) See Table 1
Trimming range
(Approximate adjustment capability)
0 to 1.2 x nominal prevalue (V5X5Z)*
0 to 1.3 x nominal prevalue (V15X5Z)
Note
* The V5X5Z chips are being gradually redesigned for a higher trimming factor -
1.3 or more instead of 1.2. For information about the availability of a specific
resistance value, contact the factory.
Resistance tolerance
Option T (trimmed to value at Vishay)*
± 0.01 %; ± 0.02 %; ± 0.05 %; ± 0.1 %; ± 0.25 %; ± 0.5 %; ± 1 %; ± 5 %
Option U (for user trimming to any value within ± 0.005 %)
G.F. = Good for values
Note
* See table 1 for resistance/tolerance limits
Power rating
(at + 70 °C ambient temperature), (see figure 4)
V5X5Z: 0.05 W (15 V maximum)
V15X5Z: 0.1 W (50 V maximum)
High frequency operation
Rise time
Inductance
Capacitance
1 ns without ringing
0.1 µH maximum; 0.08 µH typical
1.0 pF maximum; 0.5 pF typical
Current noise < 0.010 µVRMS/V of applied voltage (< - 40 dB)
Voltage coefficient < 0.1 ppm/V
Working voltage 15 V (model V5X5Z)
50 V (model V15X5Z)
Termination pads Gold: 50 µ" to 100 µ" thick
TABLE 3 - ENVIRONMENTAL PERFORMANCE COMPARISON
TYPICAL VISHAY MAXIMUM
Test group I
Thermal shock ± 0.02 % ± 0.04 %
Test group II
Low temperature operation
Short time overload
High temperature exposure
Resistance to bonding exposure
± 0.005 %
± 0.02 %
± 0.02 %
± 0.02 %
± 0.01 %
± 0.04 %
± 0.05 %
± 0.05 %
Test group III
Moisture resistance ± 0.03 % ± 0.1 %
Test group IV (Load Life Stability)
2000 h at + 70 °C
10 000 h at + 70 °C
± 0.005 %
± 0.01 %
± 0.015 %
± 0.05 %
V5X5Z, V15X5Z (Z-Foil)
Vishay Foil Resistors
Document Number: 63189 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 13-Jan-11 3
Notes
(1) TCR tracking is a measure of the similarity of resistance value change in two or more resistors which are undergoing the same
temperature changes. Tracking could be expressed as the difference in the temperature coefficients of the resistors, expressed in ppm/°C
as (ΔR1/R1 - ΔR2/R2) x 10-6/ΔT °C.
(2) Selected TCR tracking is available for specially ordered lots of resistors. The selected TCR tracking can be 3, 2, 1 and as close as 0.5 ppm/°C
throughout the full temperature range. Should close TCR tracking be required for differing resistance values, contact the factory.
V5X5Z, V15X5Z (Z-Foil)
Vishay Foil Resistors
www.vishayfoilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63189
4Revision: 13-Jan-11
To acquire a precision resistance value, the Bulk Metal Foil chip is
trimmed by selectively removing built-in “shorting bars.” To increase
the resistance in known increments, marked areas are cut,
producing progressively smaller increases in resistance. This
method reduces the effect of “hot spot” and improves the long term
stability of the hybrid chips.
FIGURE 5 - 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 4 - GLOBAL PART NUMBER INFORMATION (trimmed option) (1)(2)
NEW GLOBAL PART NUMBER: Y4033249R000Q0W (preferred part number format)
DENOTES PRECISION VALUE CHARACTERISTICS
Y R = Ω
K = kΩ
0 = standard
1 to 999 = custom
PRODUCT CODE RESISTANCE TOLERANCE PACKAGING
Trimmed (2):
4033 = V5X5ZT
4034 = V15X5ZT
T= ± 0.01 %
Q= ± 0.02 %
A= ± 0.05 %
B= ± 0.1 %
C= ± 0.25 %
D= ± 0.5 %
F= ± 1.0 %
J= ± 5.0 %
W = waffle pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y4033 249R000 Q 0 W:
TYPE: V5X5Z trimmed
VALUE: 249.0 Ω
ABSOLUTE TOLERANCE: ± 0.02 %
PACKAGING: waffle pack
HISTORICAL PART NUMBER: V5X5ZT 249R00 Q W (will continue to be used)
V5X5ZT 249R00 Q W
MODEL OHMIC VALUE RESISTANCE TOLERANCE PACKAGING
V5X5ZT
V15X5ZT
249R00 = 249.0 ΩT= ± 0.01 %
Q= ± 0.02 %
A= ± 0.05 %
B= ± 0.1 %
C= ± 0.25 %
D= ± 0.5 %
F= ± 1.0 %
J= ± 5.0 %
W = waffle pack
Notes
(1) For non-standard requests, please contact application engineering.
(2) VISHAY to supply chips trimmed to the purchaser’s exact resistance and tolerance specifications, ready for insertion into a hybrid microcircuit
with no further processing other than bonding and termination. Specify exact resistance value(s) and tolerance(s).
0332 9R04Y4 Q00 W0
TABLE 5 - GLOBAL PART NUMBER INFORMATION (untrimmed option) (1)(2)
NEW GLOBAL PART NUMBER: Y4036759R0000W (preferred part number format)
DENOTES PRECISION GOOD FOR VALUE (2) PACKAGING
Y R = Ω
K = kΩ
W = waffle pack
PRODUCT CODE CHARACTERISTICS
Untrimmed (2):
4036 = V5X5ZU
4037 = V15X5ZU
0 = standard
1 to 999 = custom
FOR EXAMPLE: ABOVE GLOBAL ORDER Y4036 759R000 0 W:
TYPE: V5X5Z untrimmed
GOOD FOR VALUE: 759.0 Ω
PACKAGING: waffle pack
HISTORICAL PART NUMBER: V5X5ZU 759R00 W (will continue to be used)
V5X5ZU 759R00 W
MODEL GOOD FOR VALUE PACKAGING
V5X5ZU
V15X5ZU
759R00 = 759.0 ΩW = waffle pack
V5X5Z, V15X5Z (Z-Foil)
Vishay Foil Resistors
Document Number: 63189 For any questions, contact: foil@vishaypg.com www.vishayfoilresistors.com
Revision: 13-Jan-11 5
Notes
(1) For non-standard requests, please contact application engineering.
(2) To order user trimmable chips specify the final resistance value desired.
0367 9R05Y4 00 W0
V5X5Z, V15X5Z (Z-Foil)
Vishay Foil Resistors
www.vishayfoilresistors.com For any questions, contact: foil@vishaypg.com Document Number: 63189
6Revision: 13-Jan-11
EFFECTS OF GOLD WIRE
The bonding of the gold wires to the chip has an effect on the overall resistance and on the temperature coefficient, according to
the length of wire used.
The nomogram below shows the effect on both parameters with varying lengths of 0.001" (0.0254 mm) diameter gold wire.
NOMOGRAM
Change of resistance and TCR due to a length L of gold wire added at wire bonding.
500
360
250
160
120
90
62.5
40
22.5
10
50
23
16
10.5
6
4
2.25
1.40
0.82
0.47
0.30
0.16
0.11
600
350
225
130
85
41
25
16
10
6
1900
1100
610
400
230
150
85
53
31
18
11
6.1
4.2
2.3
1.5
0.85
0.50
0.32
0.15
0.10
0.06
0.04
0.02
1
1.4
2.2
3.2
4
6.2
9
12.2
16
25
36
49
64
81
100
144
225
324
400
625
900
1.2K
1.6K
2.5K
3.6K
4.9K
6.4K
8.1K
10K
14.4K
22.5K
32.4K
40K
ppm
%
A
B
R
Δ
TCR
ppm/°C
Δ
R
R
L
thousandths of an inch
total length of 2 gold
wires of 0.001" diameter
nominal resistance of
chip as measured on its
pads (Ω)
EXAMPLE:
Total length of wires L = 0.100" (point A on left scale)
Resistance of chip R = 200 Ω (point B on right scale)
Read on intersection of line as with central scale:
On left side - change of resistance:
ΔR
R
On right side - change of TCR:
ΔTCR = + 2.3 ppm/°C
Nomogram based on the following specs for gold wire:
• 1.2 Ω/inch for 0.001" (0.0254 mm) diameter wire
• TCR 3900 ppm/°C
= 600 ppm
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
