85
Passive
Components
MicroMetrics, Inc. 136 Harvey Road, Building C, Londonderry, NH 03053
Voice: 603-641-3800, Fax: 603-641-3500, Internet: www.micrometrics.com, E-mail: serv@micrometrics.com
Resistor Ordering System
EXAMPLE
1 2 3 4 5 6 7 8
MTR-2R2K-SR2-K-NA-G-1-T
1) is the three letter device type designation
MTR
Single Value through Chip Resistor
(Resistance top to bottom)
MIR
Single Value Pad to Pad Chip Resistor
(Resistance Top pad to Top pad)
MCR
Dual Value Center Tap Ratio Chip Resistor.
(Res. #1 = Prime Value / Res. #2 = Ratio Value)
MMR
MultiTap Chip Resistor.
XXX
as needed.
2) is the resistance value in ohms
2R2K
2,200 Ohms
200R
200 Ohms
20R
20 Ohms
2R2M
2,200,000 Ohms
20R2K
20,200 Ohms
200RK
200,000 Ohms
please see pp 86-87 for details
3) is the chip substrate material and chip outline dimensions
(case style) R1 thru R8
case
S
Silicon Body
R1
20 Tap Multi-tap
.038"X.038" SR1
C
Ceramic R2
Dual
Value
.030"X.030" CR2
(99.6% Alumina)
B
Berilium Oxide
R3
Single Value
.020"X.020" BR3
Q
Quartz
R3A* Single Low Value .020"X.020" QR3A
N
Aluminum Nitride
R4
Six Value Ladder
.020"X.060" NR4
SP
Special Material
R5
12 Tap Multi Tap
.030"X.030" SPR5
R6
Single Low Value .030"X.030" XR6
R7
Single Value
.020"X.040" XR7
R8
XR8
please consult factory for special substrate materials (SP)
*R3A Outline for resistances < 250 Ohms
6) Backing
G
Solderable Gold
GS
Gold Silicon eutectic attachment
B
Bare
7) The temperature coefficient (TCR) of the
resistor, in PPM
0
150 PPM
1
100 PPM
2
50 PPM
3
10 PPM
8) Resistor Material
T
Tantalum Nitride TaN (Self-
Passivating)
N
NiChrome NiCr
4) is the resistor value total % tolerance
5) is the 2nd resistor value total % tolerance (if applicable)
A) On Dual Value Ratio Resistors, (MCR), this is the res. ratio of the 2nd
resistor (Ratio Res.) To value of the 1st resistor (Prime Res.).
B) On Multi Tap Resistors (MMR). This is the tolerance of each of the small value
Resistor Taps. The large value Resistor Taps are called out on (4).
A
0.5 Ohm
F
1%
B
1.0 Ohm
G
2%
C
2.5 Ohm
J
5%
D
.01%
K
10%
E
.1%
M
20%
NA
Not applicable
Example: MicroMetrics part no.
MTR-200RK-SR3-F-NA-G-0-T
This would be a silicon body .020"x .020" x .010" single
value through chip resistor
with a total resistance tolerance of 1%, a Solderable
gold back, and Tantalum Nitride as the resistor layer and
a TCR of 150PPM.
Example: MicroMetrics part no.
MCR-10RK-SR2-F-E-B-1-T
This would be a silicon body .030"x .030"x .010" two
value ratio resistor with the first
value resistance tolerance of 1% and the second, ratio
resistor, tolerance being .1% of the first value.
Resistance would be the total value of the two resistor.
A Bare lapped silicon back, and Tantalum Nitride as the
resistor layer and a TCR of 100PPM.
Example: MicroMetrics part no.
MIR-2R5K-SR3-J-NA-B-2-N
This would be a silicon body .020"x .020" x .010" single
valueTop pad to Top pad chip resistor with a total resis-
tance tolerance of 5%, a bare silicon back, with
NiChrome as the resistor layer and a TCR of 50PPM.
Example: MicroMetrics part no.
MMR-11RK-SR1-F-K-G-1-T
This would be a silicon substrates device .038" x .038"
x .010". It would have a total resistance of 11KOhms
1%. It would have ten large tops of 1KOhm 1% each
and ten small tops of 100Ohms 10% each. It would
have a solderable gold back with a TCR of 100ppm
and a Tantalum Nitride resistive layer.
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