High Precision MINI-MELF Resistor
www.vishay.com For technical questions, contact: melf@vishay.com Document Number: 28715
50 Revision: 20-Feb-12
UMA 0204
Vishay Beyschlag
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
UMA 0204 high precision thin film MINI-MELF resistors
combine the proven reliability of professional MELF products
with a most advanced level of precision and stability first
achieved with axial thin film high precision resistors. This
unique combination makes the product perfectly suited for all
applications with outstanding requirements towards reliable
precision and stability.
FEATURES
Approved to EN 140401-803
Most advanced thin film technology
Superior overall stability
TCR down to ± 5 ppm/K
High precision tolerance down to 0.02 %
Matte Sn termination on Ni barrier layer
Compliant to RoHS Directive 2011/65/EU
APPLICATIONS
Measuring and calibration equipment
Industrial process control systems
Space and aircraft electronics
Notes
• These resistors do not feature a limited lifetime when operated within the permissible limits. However, resistance value drift increasing over
operating time may result in exceeding a limit acceptable to the specific application, thereby establishing a functional lifetime.
(1) The power dissipation on the resistor generates a temperature rise against the local ambient, depending on the heatflow support of the
printed-circuit board (thermal resistance). The rated dissipation applies only if the permitted film temperature is not exceeded.
METRIC SIZE
DIN 0204
CECC RC 3715M
TECHNICAL SPECIFICATIONS
DESCRIPTION UMA 0204
Metric CECC size RC 3715M
Resistance range 22 to 332 k
Resistance tolerance ± 0.25 %; ± 0.1 %; ± 0.05 %; ± 0.02 %
Temperature coefficient ± 15 ppm/K; ± 10 ppm/K; ± 5 ppm/K
Operation mode Precision Standard
Rated dissipation, P70 (1) 0.07 W 0.25 W
Operating voltage, Umax. AC/DC 200 V
Permissible film temperature,
F max. 85 °C 125 °C
Operating temperature range - 10 °C to 85 °C - 55 °C to 125 °C
Max. resistance change at P70 for resistance range,
R/R max., after: 22 to 332 k
1000 h 0.02 % 0.05 %
8000 h 0.05 % 0.1 %
225 000 h 0.15 % 0.3 %
Permissible voltage against ambient (insulation):
1 min; Uins 300 V
Continuous 75 V
Failure rate: FITobserved 0.1 x 10-9/h
Document Number: 28715 For technical questions, contact: melf@vishay.com www.vishay.com
Revision: 20-Feb-12 51
UMA 0204
High Precision MINI-MELF Resistor Vishay Beyschlag
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
DIMENSIONS
Note
• Color code marking is applied according to IEC 60062 (3) in five bands. Each color band appears as a single solid line, voids are permissible
if at least 2/3 of the band is visible from each radial angle of view. The last color band for tolerance is approximately 50 % wider than the other
bands. An interrupted band between the 4th and 5th full band indicates the temperature coefficient (orange = TC15, blue = TC10, violett = TC05).
PATTERN STYLES FOR MELF RESISTORS
Note
• The given solder pad dimensions reflect the considerations for board design and assembly as outlined e.g. in standards IEC 61188-5-x, or in
publication IPC-7351. They do not guarantee any supposed thermal properties, however, they will be found adequate for most general
applications.
DIMENSIONS AND MASS
TYPE L
(mm)
D
(mm)
L1 min.
(mm)
D1
(mm)
K
(mm)
MASS
(mg)
UMA 0204 3.6 + 0/- 0.2 1.4 + 0/- 0.1 1.8 D + 0/- 0.15 0.8 ± 0.1 22
RECOMMENDED SOLDER PAD DIMENSIONS
TYPE
WAVE SOLDERING REFLOW SOLDERING
G
(mm)
Y
(mm)
X
(mm)
Z
(mm)
G
(mm)
Y
(mm)
X
(mm)
Z
(mm)
UMA 0204 1.5 1.5 1.8 4.5 1.7 1.2 1.6 4.1
L
1
K
D
1
D
L
GX
Y
Z
