SMR1DZ / SMR3DZ (Z-Foil)
Ultra High Precision Z-Foil Molded Surface Mount Resistor
with TCR down to ±0.2 ppm/°C, PCR of ±5 ppm at Rated Power,
Flexible Terminations, and Load-Life Stability of ±0.005 % (50 ppm)
FEATURES AND BENEFITS
• Temperature coefficient of resistance (TCR):
±0.2 ppm/°C typical (–55°C to +125°C, +25°C ref.)
• Tolerance: to ±0.01%
• Power coefficient of resistance (PCR) “∆R due to self
heating": 5 ppm at rated power
• Flexible Terminations ensure minimal stress
transference from the PCB due to a difference in
thermal coefficient of expansions (TCE)
• Electrostatic discharge (ESD): at least to 25 kV
• Load-life stability: ±0.005% (70°C, 2000 h)
• Resistance range: 5
Ω
to 80 kΩ (for higher and lower
values, please contact us)
• Power rating: to 600 mW at +70°C
• Non-inductive, non-capacitive design
• Current noise: –40 dB
• Voltage coefficient: <0.1 ppm/V
• Non-inductive: <0.08
• Non hot spot design
• Terminal finishes available: lead (Pb)-free, tin/lead alloy
• Matched sets with TCR tacking are available upon
request
• For higher performances, please contact us
• Any value available within Resistance Range (e.g.,
1K234)
• For prototype samples, please contact
foil@vpgsensors.com
Any value at any tolerance
available within resistance range
R
2
R
1
V
in
-
+
V
out
SMRxDZ
APPLICATIONS
• Precision amplifiers
• High precision
instrumentation
• Medical
• Automatic test
equipment (ATE)
• Industrial
• Audio (high end stereo
equipment)
• EB application
• Military, airborne and
space
• Pulse application
• Measurement
instrumentation
INTRODUCTION
The SMRxDZ is an ultra high precision molded surface
mountable resistor offering all the elements of precision;
including low TCR, tight tolerance, long term stability,
low noise, low thermal EMF, and non-measurable voltage
coefficient. One of the important parameters influencing
stability is the Temperature Coefficient of Resistance
(TCR). Although the TCR of foil resistors is considered
Table 1—Tolerance and TCR vs. Resistance
Value
(–55°C to +125°C, +25°C Ref.)
Value
(Ω)
50 Ω to 80 kΩ
20 Ω to <50 Ω
10 Ω to <20 Ω
5 Ω to <10 Ω
Figure 1—Power Derating Curve
200
Percent of Rated Power (%)
175
150
125
100
75
50
25
0
–75
–25
+25
+75
+125
Ambient Temperature (°C)
+175
–55 °C
+ 70 °C
Standard
Tolerance
(1)
(%)
±0.01%
±0.02%
±0.05%
±0.1%
Typical TCR and
Max. Spread
(1)
(ppm/°C)
±0.2 ±1.8
±0.2 ±2.8
±0.2 ±4.8
±0.2 ±6.8
Note
(1)
For values <5 Ω and tighter performance, contact us.
Note
* This datasheet provides information about parts that are
RoHS-compliant and/or parts that are non-RoHS-compliant.
For example, parts with lead (Pb) terminations are not RoHS
compliant. Please see the information/tables in this datasheet
for details.
Document No.: 63118
Revision: 21-Oct-2015
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
SMR1DZ / SMR3DZ (Z-Foil)
extremely low, this characteristic has been further refined
over the years. The SMRxDZ utilizes ultra high precision
Bulk Metal
®
Z-Foil.
The Z-Foil technology provides a significant reduction of
the resistive element’s sensitivity to ambient temperature
variations (TCR) and to self heating when power is applied
(power coefficient).
Voltage division with tight tracking <2 ppm/°C can be
achieved with two randomly selected units even with a
large ratio between the two values.
Our Application Engineering Department is available to
advise and make recommendations. For non-standard
technical requirements and special applications, please
contact us.
Table 2—Performance Specifications
Parameters
SMR1DZ
Resistance Range
Rated Power
Weight
Packaging
Test
Max. Working Voltage
Max. Operating
Temperature
Working Temperature
Range
Thermal Shock
Short Time Overload
Low Temperature
Operation
Dielectric Withstanding
Voltage
Insulation Resistance
Resistance to
Soldering Heat
Moisture Resistance
Shock
Vibration, High Frequency
Load-Life Stability
(2000 h)
High Temperature
Exposure
5
Ω
to 10 kΩ
10 kΩ to 33 kΩ
5
Ω
to 30 kΩ 30 kΩ to 80 kΩ
0.250 W at 70°C 0.160 W at 70°C 0.6 W at 70°C 0.4 W at 70°C
0.125 W at 125°C 0.08 W at 125°C 0.3 W at 125°C 0.2 W at 125°C
0.1143 g
0.244 g
Bulk (loose) or tape and reel, per EIA-481-1
Conditions
73 V
180 V
+175°C (see Figure 1)
–55°C to +125°C (MIL range)
–65°C to +150°C; 30 min; 5 cycles
6.25 x rated power; 5 s
–65°C, 24 h (no load): 45 min at rated power
Atmospheric pressure; AC 200 V; 1 min
DC 100 V; 1 min
260°C for 10 s
+65°C to –10°C; 90% to 98% RH; rated power; 240 h
100 G; Sawtooth
10~2000~10 Hz; 20 G; X, Y, Z each 2.5 h
0.04 W at +70°C
0.25 W at +70°C
0.125 W at +125°C
0.1 W at +70°C
0.6 W at +70°C
0.3 W at +125°C
Specifications
SMR3DZ
Maximum Limit
(1)
SMR1DZ
SMR3DZ
5
Ω
to 33 kΩ
5
Ω
to 80 kΩ
See Figure 1
Maximum Limit
(1)
—
—
—
R >100 Ω: ±0.02% (200 ppm)
R ≤100 Ω: ±0.03% (300 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
over 10 000 MΩ
±0.03%
±0.03% (300 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
Typical
0.005%
0.02%
0.05% max
Typical
0.005%
0.015%
0.05% max
175°C; no load 2000 h
±0.1% (1000 ppm)
Note
(1)
As shown +0.01
Ω
to allow for measurement errors at low values.
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Document No.: 63118
Revision: 21-Oct-2015
SMR1DZ / SMR3DZ (Z-Foil)
Figure 2—Dimensions
in Inches (Millimeters)
Side View
L
TH Minimum
VALUE (5 DIGITS)
Top View
100R0T
z
Stand Off
TOLERANCE
Z-FOIL
INDICATOR
P
P
End View
H
V
(DATE CODE)
-
W
LEAD (Pb)-FREE INDICATOR
Bottom View
W
H
0.098 ±0.012
(2.49 ±0.30)
0.110 ±0.012
(2.79 ±0.30)
P
0.051 ±0.012
(1.30 ±0.30)
0.051 ±0.012
(1.30 ±0.30)
TW
Model
SMR1DZ
SMR3DZ
L
0.236 ±0.012
(5.99 ±0.30)
0.287 ±0.012
(7.29 ±0.30)
TW
0.087 ±0.004
(2.21 ±0.10)
0.095 ±0.004
(2.41 ±0.10)
TH (Minimum)
0.039
(0.99)
0.039
(0.99)
0.126 ±0.012
(3.20 ±0.30)
0.170 ±0.012
(4.32 ±0.30)
Figure 3—Recommended Mounting Pad Geometries
in Inches (Millimeters)
Reflow Solder Pads
D
C
B
E
A
Model
SMR1DZ
SMR3DZ
Per IPC-SM-782 Rev A
Method
Reflow
A Min
0.110 (2.79)
0.118 (3.00)
B Ref
0.106
(2.69)
C Ref
0.124 (3.15)
0.175 (4.45)
D ±0.04 (±1.02)
0.337 (8.55)
0.388 (9.86)
E Ref
0.050
(1.27)
Figure 4—Trimming to Values
(conceptual illustration)
Interloop
capacitance
reduction
in series
Mutual
inductance
reduction
due to change
in current
direction
Current path
before trimming
Current path after trimming
Figure 5—Typical TCR Curve Z-Foil
+500
TCR Values for Different Temperature Ranges
+400
+300
Note
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 spots” and
improves the long-term stability of VFR resistors.
Trimming process
removes this material
from shorting strip area
changing current path
and increasing
resistance
Foil shown in black, etched spaces in white
+100
R
0
R
(ppm)
–100
–200
–300
–500
+200
0.05 ppm/°C
–0.1 ppm/°C
–0.16 ppm/°C
–55
–25
0.1 ppm/°C
0.14 ppm/°C
0.2 ppm/°C
+100
+125
–400
0
+25
+60 +75
Ambient Temperature (°C)
Notes
• For more details, see Table 1.
• The TCR values for <80
Ω
are influenced by the
termination composition and the result is deviation from
this curve.
Document No.: 63118
Revision: 21-Oct-2015
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
3
SMR1DZ / SMR3DZ (Z-Foil)
Table 3—Part Number Information
NEW GLOBAL PART NUMBER: Y174510K0000T9R (preferred part number format)
DENOTES PRECISION
Y
R
=
K
=k
VALUE
0
= Standard
9
= Lead (Pb)-free
1 to 999
= Custom
AER*
Y
1
7
4
5
1
0
K
0
0
0
0
T
9
R
PRODUCT CODE
1745
= SMR1DZ
1746
= SMR3DZ
RESISTANCE TOLERANCE
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
L
= Bulk Pack
R
= Tape and Reel
PACKAGING
FOR EXAMPLE: ABOVE GLOBAL ORDER Y1745 10K0000 T 9 R:
TYPE: SMR1DZ
VALUE: 10.0 k
ABSOLUTE TOLERANCE: ± 0.01 %
TERMINATION: Lead (Pb)-free
PACKAGING: Tape and Reel
SMR1DZ
MODEL
SMR1DZ
SMR3DZ
HISTORICAL PART NUMBER: SMR1DZ 10K000 TCR0.2 T S T (will continue to be used)
10K000
OHMIC VALUE
10.0 k
TCR0.2
TCR
CHARACTERISTIC
T
RESISTANCE
TOLERANCE
T
= ± 0.01 %
Q
= ± 0.02 %
A
= ± 0.05 %
B
= ± 0.1 %
C
= ± 0.25 %
D
= ± 0.5 %
F
= ± 1.0 %
S
TERMINATION
S
= Lead (Pb)-free
B
= Tin/Lead
T
PACKAGING
B
= Bulk Pack
T
= Tape and Reel
Note
* For non-standard requests, please contact Application Engineering.
www.vishayfoilresistors.com
4
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Document No.: 63118
Revision: 21-Oct-2015
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Vishay Precision Group, Inc.
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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