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 k
Ω
(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 µV
RMS
/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 value remains stable after trimming. Load life stability is
0.05 %
Δ
R 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.