MTVA Thermopad
®
Series
MTVA Thermopad Series
®
ATTENUATOR TEMPERATURE VARIABLE CHIP 200 MILLIWATTS
MTVA Thermopad
®
Series offer a passive
solution for gain
compensation over
temperature with proven
high reliability heritage.
Smiths Interconnect is the world leader in
temperature variable chip attenuators offering the
widest selection of products from DC through Ka
band. Thermopad
®
products have been a highly
reliable passive solution for over temperature gain
compensation for more than 20 years. Backed
by proven performance and significant heritage,
Smiths Interconnect is the leader in high reliability
components.
The MTVA platform offers significant heritage and proven
performance in a cost effective commercial grade product.
High reliability tested options are also available to ensure mission
success in demanding high reliability applications. Rated for
DC-18 GHz with excellent broadband response, the MTVA series
of products has a wide range of applications. It is constructed on
an Alumina substrate with rugged thick film terminations and thick
film thermistor technology. The product also includes a protective
coating for added protection from various environmental conditions.
Multiple attenuation values, temperature shift options and mounting
configuration are available to support both surface mount and wire
bond applications. Various finish options are also available including
RoHS compliance.
Features and Benefits
■
Small Footprint
■
Multiple Mounting Configurations
■
Broad Frequency Range
■
Low VSWR
■
Wide Range of Attenuation Values
■
Multiple Temperature Shift Options
■
Tight Attenuation Tolerance
Applications
■
Amplifier Circuits
■
Transmit/Receive Modules
■
Up/Down Converters
■
Instrumentation
■
Satellite Communications
■
Radar
■
Broadcast
MTVA Thermopad
®
Series
Technical Characteristics
Mounting Configuration
Options
Planar
Single Wrap (W1)
Triple Wrap (W3)
Wire Bondable Gold (WB1)
Electrical
Nominal Impedance
Frequency Range
50 ohms
DC -18 GHz (-0.001
through -0.005 dB/dB/°C)
DC- 12.4 GHz (-0.006
through -0.009 dB/dB/°C)
0-10 in 1 dB Increments
± 0.5 dB @ 1 GHz @ 25°C
-0.001 through -0.009
dB/dB/°C in 0.001dB/
dB/°C increments
± 0.001 dB/dB/°C
200 Milliwatts Max up to 125°C (See derating curve)
2 Watts based on 10 µS pulse width @ 1% Duty Cycle
1.30:1 Max @ 1 GHz
-0.003 through -0.007
& -0.009 dB/dB/°C
in 0.001dB/dB/°C
increments
-0.002 through -0.007
& -0.009 dB/dB/°C
in 0.001dB/dB/°C
increments
-0.003 through -0.009
dB/dB/°C in 0.001dB/
dB/°C increments
DC -12.4 GHz
Attenuation Values Available
Attenuation Accuracy
Temperature Coefficient of
Attenuation (TCA)
1-8 in 1 dB Increments
1-9 in 1 dB Increments
0-9 in 1 dB Increments
Temperature Coefficient
Tolerance
Input Power CW
Peak Power
VSWR
Environmental
Operating Temperature
Storage Temperature
Moisture Sensitivity Level
-55°C to +150°C
-65°C to +150°C
MSL 1 - Unlimited
Mechanical
Substrate Material
Resistive Film
Terminal Material
Protective Coating
Finish Options
Blank
-F
-S
-G
Alumina (Al
2
O
3
) 96%
Thin Film, Thermistor
Thick Film
Polymer
Solder Plated (Sn60/Pb40) Solder Plated (Sn60/Pb40)
Silver Plated
(RoHS Compliant)
Pretinned (Sn60/Pb40)
Gold (Thick Film)
dB Value (X), Direction of
shift (N), & TCA value (X)
Silver Plated (RoHS Compliant)
Pretinned (Sn60/Pb40)
N/A
Thick Film Bondable Gold
Input/Output Pads, Solder-
able Platinum Gold Ground
Marking
Unit Marking
None
dB Value (X), Direction of
shift (N), & TCA value (X)
None
Quality Assurance
Sample visual and mechanical Inspection - 1.0 AQL per mechanical drawing requirements.
Periodic electrical inspection performed for commerical grade products.
High reliability tested products are available per MIL-PRF-55342.
TCA Calculation Method
- Measure Attenuation @ DC every 20°C over the temperature range of -55°C to +125°C
Calculate the slope of the curve using linear regression.
Calculate TCA using the following formula:
TCA =
Slope
Attenuation @ 25˚C
Packaging
Standard Packaging
2
Tape and Reel or Waffle Pack
MTVA Thermopad
®
Series
Power Derating Curve
100%
RATED
POWER
50%
SAFE OPERATING AREA
0%
-55
0
100
125
150
TEMPERATURE IN °C
Typical Data
MTVAXX00N0X Series Attenuation
MTVAXX00N0X Series Attenuation
0
-1
-2
-3
MTVAXX00N0X Series VSWR
MTVA0X00N0X Series VSWR
2
1.9
1.8
MTVA0100N0X
MTVA0200N0X
MTVA0300N0X
MTVA0400N0X
MTVA0500N0X
MTVA0600N0X
MTVA0700N0X
MTVA0800N0X
MTVA0900N0X
MTVA1000N0X
Attenuation (dB)
-4
-5
-6
-7
-8
-9
-10
-11
-12
0
2
4
6
8
10
12
14
16
18
1.7
1.6
VSWR
1.5
1.4
1.3
1.2
1.1
1
0
2
4
6
8
10
12
14
16
18
Frequency (GHz)
Frequency (GHz)
3
MTVA Thermopad
®
Series
Mechanical
MTVA - Planar Option
INPUT/OUTPUT
0.018 TYP [0.46]
0.012±0.003
0.075 [1.91]
0.025 [0.64]
XNX
0.010 [0.25]
GROUND
MARKING ON
THIS SURFACE
0.060 [1.52]
MTVA - Single Wrap Option
INPUT/OUTPUT
0.018 TYP [0.46]
0.016±0.003
0.075 [1.91]
0.025 [0.64]
0.060 [1.52]
GROUND
0.010 [0.25]
FULL GROUND
TERMINAL
MTVA - Triple Wrap Option
0.077 [1.96]
INPUT/OUTPUT
0.019 TYP [0.48]
0.016±0.003
0.021 TYP [0.53]
0.025 [0.64]
0.025 TYP [0.64]
XNX
0.015 [0.38]
MARKING ON
THIS SURFACE
GROUND
0.061 [1.55]
0.010 [0.25]
MTVA - Wire Bondable Gold Option
INPUT/OUTPUT
0.018 TYP [0.46]
0.016±0.003
0.075 [1.91]
0.025 [0.64]
0.060 [1.52]
GROUND
0.010 [0.25]
FULL GROUND
TERMINAL
*Dimensions apply before solder, allow 0.015” max for all pretinned surfaces
Unless otherwise specified, tolerance: X.XXX = ±0.005”
4
MTVA Thermopad
®
Series
Suggested Mounting Footprint
Inches
Part Number
MTVA0X00N0X (Planar) and
MTVA0X00N0XW3 (Triple Wrap)
A
0.022
B
0.028
C
0.041
D
0.013
S
0.026
W
0.075
A
0.56
B
0.71
C
1.04
MM
D
0.33
S
0.66
W
1.91
A
B
C
S
D
W
PLATED
THRU
HOLES
How To Order
M T VA
Specify Model Number:
MTVAXX00N0X
00
N
0
1
1
Series Name
2
Atttenuation Value
3
EMC Code
4
TCA Slope
5
TCA Shift Option
(dB/dB/˚C)
2
M T VA
00
00
N
3
Series
4
5
6
7
00 dB through
EMC Code
1 0
10 dB
Negative
01=0.001
06=0.006
0 1
06
02
07
W 1
02=0.002
07=0.007
03
08
03=0.003
08=0.008
04
09
04=0.004
09=0.009
05
05=0.005
6
Options
Planar
Single Wrap Ground
W 3
7
Terminal Finish
Triple Wrap - All Ports
W B 1
F
Wire Bondable
Standard
S
Pretinning
RoHS
G
Gold
5
