CTA
Vishay Electro-Films
CHIP
RESISTORS
Thin Film, Center-Tapped Resistor
FEATURES
• Wire bondable
• Center tap feature
Product may not
be to scale
• Tight ratio tolerances to: ± 0.1 %
• Chip size: 0.030 inches square
The CTA series resistor chips combine the best tolerances,
stability and low shunt capacitance. The CTA offers the
designer flexibility in use as either a single value resistor or
as two resistors with a center tap feature. The CTAs six
bonding pads allows the user increased layout flexibility. The
CTAs are manufactured using Vishay Electro-Films (EFI)
sophisticated thin film equipment and manufacturing
technology. The CTAs are 100 % electrically tested and
visually inspected to MIL-STD-883.
• Resistance range total: 25 Ω to 35 kΩ
• Alumina substrate, low shunt capacitance: < 0.2 pF
• Resistor material nichrome
• Excellent stability: ± 0.025 % maximum ΔR/R
APPLICATIONS
I
The CTA center-tapped resistor chips are used mainly in
feedback circuits of amplifiers where ratio matching, low
shunt capacitance and tracking between two resistors is
critical.
Recommended for hermetic environments where chip is not
exposed to moisture.
For lower values, the resistance of the six bonding-pad
configurations can vary, depending on the method of
measurement used. Vishay EFI measures low-value
resistors by the four-wire Kelvin technique. The measuring
method is illustrated in the diagram to the right.
I
RA
V
I
RB
V
V
TEMPERATURE COEFFICIENT OF RESISTANCE, VALUES AND TOLERANCES
Tightest Standard Tolerance Available
PROCESS CODE
0.1 %
CLASS H*
25 Ω
100 Ω 200 Ω 1 kΩ
230
201
± 100 ppm/°C
232
200
± 50 ppm/°C
233
202
± 25 ppm/°C
CLASS K*
203
± 10 ppm/°C
231
*MIL-PRF-38534 inspection criteria
20 kΩ
35 kΩ
STANDARD ELECTRICAL SPECIFICATIONS
PARAMETER
TCR Tracking Between Halves (RA/RB)
Center Tap Ratio, RA/RB: Tolerance
Noise, MIL-STD-202, Method 308
Moisture Resistance, MIL-STD-202, Method 106, (Passivated only)
Stability, 1000 h, + 125 °C, 62 mW
Operating Temperature Range
Thermal Shock, MIL-STD-202, Method 107, Test Condition F
High Temperature Exposure, + 150 °C, 100 h
Insulation Resistance
Operating Voltage
DC Power Rating at + 70 °C (Derated to Zero at + 150 °C)
5 x Rated Power Short-Time Overload, + 25 °C, 5 s
± 2 ppm/°C*
1 ± 1 % standard
- 35 dB typ.
± 0.5 % max. ΔR/R
± 0.025 % max. ΔR/R
- 55 °C to + 125 °C
± 0.1 % max. ΔR/R
± 0.1 % max. ΔR/R
1012 min.
100 V max.
125 mW
± 0.25 % max. ΔR/R %
*10ppm/°C for R < 100
www.vishay.com
68
For technical questions, contact: efi@vishay.com
Document Number: 61015
Revision: 12-Mar-08
