The MVR34 chip trimmer potentiometer is designed for use in automatic regulators. With its highly stable and reliable
ruthenium oxide resistor on an alumina substrate, it offers outstanding dependability in a small, lightweight package.
Features
1) Excellent for use in automatic regulators.
2) Easy to set manually using a regular phillips screwdriver.
3) Superb solder ability thanks to extra soldering electrode.
4) Close match between wiper and dielectric reduces noise.
5) Mounting can be automated by using a carrier tape.
6) Two-digit markings used to indicate resistance.
7) ROHM resistors have approved ISO9001- / ISO/TS 16949- certification.
Ratings
Design and specifications are subject to change without notice. Carefully check the specification sheet before using or
ordering it.
Item
Rated power
Conditions
Power must be derated according to the power derating curve in
Figure 1 when ambient temperature exceeds 70°C.
100
80
60
40
20
0
Specifications
0.1W (1 / 10W) / element
at 70°C
POWER LOAD (%)
−55
0
70
100
125
AMBIENT TEMPERATURE (°C)
Fig.1
Rated voltage
The voltage rating is calculated by the following equation. If the value
obtained exceeds the maximum operating voltage, the voltage rating
is equal to the maximum operating voltage.
E: Rated voltage (V)
P: Rated power (W)
R: Nominal resistance (Ω)
100 to 1MΩ
(recommended resistance value: E3 series)
(applicable resistance value: E6 series)
Max. operating voltage: 50V
E=
P×R
Nominal total
resistance range
Total resistance
tolerance
Resistance
variation
Effective rotation angle
Operating temperature
Reactive variable
Rotational angle, both ends
±25%
B (linear) characteristics
220±20°
−55°C
to
+125°C
within 10% (R
>
150Ω)
within 20% (R
≤
150Ω)
•Before
using components in circuits where they will be exposed to transients such as pulse loads (short-duration, high-level loads), be certain to evaluate the
component in the mounted state. In addition, the reliability and performance of this component cannot be guaranteed if it is used with a steady state voltage that
is greater than its rated voltage.
•The
remainder of flux may negatively affect product performance and reliability. So please make sure to wash and remove flux completely washing.
Rev.C
1/4
MVR34
Resistors
Characteristics
Characteristics
DC total resistance
Contact
resistance rate
Resistance change
characteristics
Residual resistance
Wiper noise
Specifications
Within
±25%
3% or less
B group OB
R < 1kΩ 20Ω or less
R
≥
1kΩ Within 2% of total nominal resistance
5% or less of total nominal resistance,
within the effective rotational range
JIS C 5261 5.1
JIS C 5261 5.9
JIS C 5261 5.1
Voltage method
JIS C 5261 5.1
JIS C 5261 5.8 B method
Rotational speed of approx. 10 cycles per minute
(with one cycle defined as one round trip)
• Measured circuit
Oscilloscope
Test method (JIS C 5261)
Rx
Is
• Measured waveform
Vn
Resistance temperature
characteristics
Resistance
to dry heat
Temperature cycling
Resistance
to humidity
(steady state)
Endurance
(under load in damp
environment)
Endurance
(steady state)
±250ppm
/
°C
Total resistance change rate:
±
(5.0%+0.1Ω)
Constriction contact resistance rate: 8% or less
Total resistance change rate:
±
(5.0%+0.1Ω)
Constriction contact resistance rate: 8% or less
Total resistance change rate:
±
(5.0%+0.1Ω)
Constriction contact resistance rate: 8% or less
Total resistance change rate:
±
(5.0%+0.1Ω)
Constriction contact resistance rate: 8% or less
Provided that the constant current has been set
according to the following:
Is: Is
=
10
Rx
(When Rx
≤
1kΩ,
constant current is defined as Is=10mA)
Rx: Nominal resistance of semi-fixed test resistor.
Vn: Noise voltage
Noise rate
=
Vn
×100
(%)
Is
×
Rx
JIS C 5261 5.3
+25
/
−55
/
+25
/
+125°C
JIS C 5261 7.2
125°C Test time: 1,000 to 1,048 hrs.
JIS C 5261 7.3
Test temperature:
−55°C
to
+125°C
100cyc.
JIS C 5261 7.4
60°C, 95%RH
Test time: 1,000 to 1,048 hrs.
JIS C 5261 7.6
Rated voltage (current), 60°C, 95%RH
1.5h: ON
−
0.5h: OFF
Test time: 1,000 to 1,048 hrs.
JIS C 5261 7.7
Rated voltage (current), 70°C
1.5h: ON – 0.5h: OFF
Test time: 1,000 to 1,048 hrs.
JIS C 5261 6.2
JIS C 5261 7.8
After 20 rotations
Total resistance change rate:
±
(5.0%+0.1Ω)
Constriction contact resistance rate: 8% or less
Rotational torque
Endurance
(wiper)
1.9~19.7mN · m
(20~200gf · cm)
Total resistance change rate: Within
±15%
Constriction contact resistance rate: 8% or less
Rev.C
2/4
MVR34
Resistors
Characteristics
Terminal strength
(compression)
Specifications
Total resistance change rate:
±
(3.0%+0.1Ω)
There must be no mechanical damage.
Test method (JIS C 5261)
JIS C 5261 6.5
Force (4.9N) is applied from three directions upon the middle of the
sides of the sample on the surface being tested, as shown in the
illustration on the left.
Terminal strength
(bending)
Resistance to
soldering heat
Solderability
Total resistance change rate:
±
(3.0%+0.1Ω)
There must be no mechanical damage.
Total resistance change rate:
±
(3.0%+0.1Ω)
Constriction contact resistance rate: 5% or less
95% of terminal surface must be covered by
new soldering, and there must be no
soldering corrosion.
JIS C 5261 6.5
Duration of pressure: 5±1s.
Amount of bending: 3mm
JIS C 5261 6.7
Soldering conditions: 260±5°C
Soldering time: 10±1s.
JIS C 5261 6.8
Flux: Rosin methanol or rosin isopropyl alcohol
Solder: H63A
Soldering conditions: 235±5°C
Soldering time: 2.0±0.5s.
Dimensions
(Unit: mm)
A
F
G
B
1
T2
I
J
6
3
Part
Material
96% alumina or greater.
Metal glaze composed mainly of RuO2.
Stainless steel
+
nickel plating
+
gold plating
Stainless steel
1
Substrate
P
2
Dielectric paste
3
Electrode #2 (T2)
4
Wiper
C
H
E
N
D
M
4
2
O
5
Electrodes #1,#3(T1,T3) Ag / Pd, Pt thick film
+
extra soldering electrode
6
Protective film
Organic film
L
T1
A
3.0±0.1
I
1.7±0.1
K
(Unit : mm)
5
B
1.5±0.1
J
0.6±0.1
T3
C
1.5±0.1
K
0.7±0.1
D
1.6±0.15
L
1.0±0.15
E
3.5±0.1
M
0.9±0.2
F
3.0±0.1
N
0.75±0.2
G
1.9±0.05
O
0.8±0.2
H
0.5±0.05
P
1.0±0.2
Equivalent circuit
T
1
T
2
T
3
T: terminal
Rev.C
3/4
MVR34
Resistors
Packaging
Reel
Taping
P
0
P
2
φ
D
0
W
F
A
B
D
0 .4
0. 6
0. 2
0 .8
B
0
E
K
0 .2
0 .4
0 .6
0. 8
A
0
P
1
C
La be l
(Unit : mm)
EIAJ ET-7200B compliant
W
8.0±0.2
F
3.5±0.05
P
0
4.0±0.1
E
1.75±0.1
P
1
4.0±0.1
A
0
3.3±0.2
P
2
2.0±0.05
B
0
3.8±0.2
K
2.2±0.3
(Unit : mm)
D
0
A
B
C
D
φ13±0.2
0
φ180 −1.5
φ60 +1
0
9
+1.0
0
+0.1
φ1.5
0
Part No. Explanation
Part No.
Packaging / Processing specifications
Resistance
tolerance
Reel
φ180mm
(7in)
Basic
ordering
unit(pcs)
Nominal
resistance
3-digit IEC coding system
Code
HXBR
Part No.
MVR34
Soldering
Reflow soldering
Packaging specifications
Embossed tape
(4mm Pitch)
N
±25%
2,000
Recommended screwdriver for adjusting MVR resistors
Model
Open, type 3
MVR34
Dimensions, configuration
Manual adjustment, automatic adjustment
Commercially sold product
(Maker)
No.9000 (
+
) 0×30 [Vessel]
No.205 (
+
) No.0 [Vessel]
Rev.C
4/4
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
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