CTA
Vishay Electro-Films
Thin Film, Center-Tapped Resistor
FEATURES
• Wire bondable
Product may not
be to scale
• Center tap feature
• 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
I
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.
RA
RB
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.
V
V
V
TEMPERATURE COEFFICIENT OF RESISTANCE, VALUES AND TOLERANCES
Tightest Standard Tolerance Available
PROCESS CODE
1.ꢀ %
CLASS H*
CLASS K*
233
ꢀ1 ppmꢁ/C
203
ꢂ2 ppmꢁ/C
202
232
21 ppmꢁ/C
200
230
ꢀ11 ppmꢁ/C
201
231
*MIL-PRF-38534 inspection criteria
ꢀ kΩ
ꢂ2 Ω ꢀ11 Ω ꢂ11 Ω
ꢂ1 kΩ 32 kΩ
STANDARD ELECTRICAL SPECIFICATIONS
PARAMETER
TCR Tracking Between Halves (RAꢁRB)
Center Tap Ratio, RAꢁRB: Tolerance
Noise, MIL-STD-ꢂ1ꢂ, Method 318
2 ppm/°C*
1 % standard
- 35 dB typ.
1
Moisture Resistance, MIL-STD-ꢂ1ꢂ, Method ꢀ16, (Passivated only)
Stability, ꢀ111 h, + ꢀꢂ2 /C, 6ꢂ mW
Operating Temperature Range
Thermal Shock, MIL-STD-ꢂ1ꢂ, Method ꢀ17, Test Condition F
High Temperature Exposure, + ꢀ21 /C, ꢀ11 h
Insulation Resistance
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.
Operating Voltage
100 V max.
DC Power Rating at + 71 /C (Derated to Zero at + ꢀ21 /C)
2 x Rated Power Short-Time Overload, + ꢂ2 /C, 2 s
125 mW
0.25 % max. ΔR/R %
*10ppm/°C for R < 100
www.vishay.com
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For technical questions, contact: efi@vishay.com
Document Number: 61015
Revision: 12-Mar-08