SMR3Z1 (Z1 Foil Technology)
Molded Surface Mount Resistor with Flexible Terminations
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: 0.01% typical (0.6 W at 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 customized performances, please contact us
• Any 6-digit value available within resistance range (e.g.,
1K234)
• For prototype samples, please contact
foil@vpgsensors.com
Ultra High Precision Z1 Foil Technology
APPLICATIONS
IM
Typical TCR and
Max. Spread
(1)
(ppm/°C)
±0.2 ±1.8
±0.2 ±2.8
±0.2 ±4.8
±0.2 ±6.8
EL
Standard
Tolerance
(1)
(%)
±0.01%
±0.02%
±0.05%
±0.1%
Table 1—Tolerance and TCR vs. Resistance
Value
(–55°C to +125°C, +25°C Ref.)
Value
(Ω)
IN
200
Percent of Rated Power (%)
175
150
125
100
75
50
25
0
–75
• Precision amplifiers
• High precision
instrumentation
• Medical
• Automatic test
equipment (ATE)
• Industrial
INTRODUCTION
The SMR3Z1 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. The SMR3Z1 is based on the Z1 Foil
Technology which is is virtually insensitive to destabilizing
factors.
Figure 1—Power Derating Curve
–55 °C
+ 70 °C
50 Ω to 80 kΩ
20 Ω to <50 Ω
10 Ω to <20 Ω
5 Ω to <10 Ω
PR
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.
AR
V
in
-
+
R
1
–25
+25
+75
+125
Ambient Temperature (°C)
Document No.: 63273
Revision: 19-Dec-2017
For any questions, contact
foil@vpgsensors.com
Y
R
2
V
out
Any value at any tolerance
available within resistance range
• Audio (high end stereo
equipment)
• EB application
• Military, airborne and
space
• Pulse application
• Measurement
instrumentation
+175
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SMR3Z1 (Z1 Foil Technology)
The ultra-high stability of Z1 Foil Technology is achieved
using a solid alloy that is matched to the ceramic
substrate with polyimide bonding to enable a uniform
thickness of the bond line, a superior adhesion strength,
and an improved resistance to moisture. The Z1 Foil
Technology provides an order of magnitude improvement
in overall environmental performances and in long-term
stability over time.
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
Resistance Range
Rated Power
Weight
Packaging
Test
Max. Working Voltage
Max. Operating Temperature
Working Temperature Range
Thermal Shock
Short Time Overload
Low Temperature Operation
Resistance to Soldering Heat
Moisture Resistance
Shock
Vibration, High Frequency
Load-Life Stability (2000 h)
High Temperature Exposure
Specifications
5
Ω
to 30 kΩ
0.6 W at 70°C
0.3 W at 125°C
30 kΩ to 80 kΩ
0.4 W at 70°C
0.2 W at 125°C
Maximum Limit
(1)
5
Ω
to 80 kΩ
See Figure 1
0.244 g
Bulk (loose) or tape and reel, per EIA-481-1
Conditions
180 V
+175°C (see Figure 1)
–55°C to +125°C (MIL range)
–65°C to +150°C; 30 min; 5, 100 cycles
6.25 x rated power; 5 s
–65°C, 24 h (no load): 45 min at rated power
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
0.6 W at +70°C
0.3 W at +125°C
175°C; no load 2000 h
Maximum Limit
(1)
—
—
—
0.005% (50 ppm)
±0.01% (100 ppm)
±0.005% (50 ppm)
±0.01 (100 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
±0.01% (100 ppm)
0.01% (100 ppm) typical
0.025% (250 ppm) max
±0.05% (500 ppm)
Note
(1)
As shown +0.01
Ω
to allow for measurement errors at low values.
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
0.110 ±0.012
(2.79 ±0.30)
P
0.051 ±0.012
(1.30 ±0.30)
TW
Model
SMR3Z1
L
0.287 ±0.012
(7.29 ±0.30)
TW
0.095 ±0.004
(2.41 ±0.10)
TH (Minimum)
0.039
(0.99)
0.170 ±0.012
(4.32 ±0.30)
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Document No.: 63273
Revision: 19-Dec-2017
SMR3Z1 (Z1 Foil Technology)
Figure 3—Recommended Mounting Pad Geometries
in Inches (Millimeters)
Reflow Solder Pads
D
C
B
E
A
Model
SMR3Z1
Per IPC-SM-782 Rev A
Method
Reflow
A Min
0.118 (3.00)
B Ref
0.106 (2.69)
C Ref
0.175 (4.45)
D ±0.04 (±1.02)
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.: 63273
Revision: 19-Dec-2017
For any questions, contact
foil@vpgsensors.com
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3
SMR3Z1 (Z1 Foil Technology)
Table 3—Part Number Information
NEW GLOBAL PART NUMBER: Y274610K0000T9R (preferred part number format)
DENOTES PRECISION
Y
R
=
K
=k
VALUE
TERMINAL CHARACTERISTIC
0
= Standard
9
= Lead (Pb)-free
1 to 999
= Custom*
Y
2
7
4
6
1
0
K
0
0
0
0
T
9
R
PRODUCT CODE
2746
= SMR3Z1
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 Y2746 10K0000 T 9 R:
TYPE: SMR3Z1
VALUE: 10.0 k
ABSOLUTE TOLERANCE: ± 0.01 %
TERMINATION: Lead (Pb)-free
PACKAGING: Tape and Reel
SMR3Z1
MODEL
SMR3Z1
HISTORICAL PART NUMBER STYLE: SMR3Z1 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
* Customizations are available, contact Application Engineering foil@vpgsensors.com
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4
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Document No.: 63273
Revision: 19-Dec-2017
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Vishay Precision Group, Inc.
Disclaimer
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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