Designing and manufacturing innovative frequency control devices since 1927
Microprocessor Crystals
MM49
M
SM49
For many years, the MM49 unit was an industry-standard crystal, with advantages in size and cost. Although
smaller and newer designs have gained large acceptance, the reliable MM49 remains the most economical in
many applications. In addition, it can usually be designed to provide special motional parameter requirements,
such as VCXO pull, that smaller crystal units cannot match. So if cost is an issue, Monitor recommends the
rugged, resistance-welded MM49, and its surface-mountable partner, the SM49.
SPECIFICATIONS
Frequency Range
Operating Temp Range
Storage Temp Range
Shunt Capacitance
Calibration Tolerance
Frequency Tolerance
vs Temp Range
Equiv Series Resistance
(MHz =
✡
max)
Fundamental unless otherwise
otherwise indicated
MM49 & SM49
1.0 ~ 200.0 MHz*
-201C ~ 701C (other ranges available, please call factory)
-551C ~ 1051C
7.0 pF max
!
30ppm @ 251C
!
50ppm from -201C to 701C standard (call for other options)
1.0
1.843 ~ 4.0
4.0 ~ 6.0
6.0 ~ 24.0
= 3000
= 800
= 100
=
40
24.0 ~ 75.0
75.0 ~ 160.0
160.0 ~ 180.0
180.0 ~ 200.0
= 40 (3rd
= 80 (5th
= 120 (7th
= 140 (9th
Overtone)
Overtone)
Overtone)
Overtone)
Drive Level
Humidity
Hermetic Seal
Solderability
Vibration
Shock
Packaging
0.1 mW max
85% RH, 851C, 48 Hours
Leak Rate 2 x 10
-8
ATM-cm
3
/sec max
MIL-STD-202F Method 208E
MIL-STD-202F Method 204; 35G, 50~2000 Hz (<25.0 MHz);
20G, 50~2000 Hz (25.0 MHz)
MIL-STD-202F Method 213B Test Cond E, 1000G, 1/2 Sine Wave
Bulk (standard); Tape & Reel available (see over)
* Call for your specific frequency requirement
MM49
Units = mm
Monitor Products has a proven track record as a pioneer manufacturer
in the frequency control market. If our extensive selection of standard
and engineered crystals and oscillators does not meet your spec, we
will work with you towards a customized solution.
SM49
Monitor Products Company Inc reserves the right to make changes to its products and product specifications without notice. No liability is assumed as a result of their use or application.
07-02-01
502 VIA DEL MONTE, OCEANSIDE, CA 92054
TEL:
760.433.4510
FAX:
760.434.0255
MM49
M
SM49
Microprocessor Crystals
TAPE & REEL SPECIFICATIONS
MM49:
18.0mm tape, 1500 pcs/reel (specs as pictured)
SM49:
Please contact factory
Units = mm
CRYSTAL
CORRELATION THEORY
Series Resonance:
At series resonance, the crystal looks
resistive in the circuit, and correlation of
frequency is not a problem. It must be
specified if unit is to be manufactured at
series or at a particular load capacitance.
Anti-Resonance Parallel:
Crystals operating at anti-resonance
will look inductive in the circuit.
Changes of reactive values in the
circuit will change the crystal
frequency. If the crystal is to be used
at anti-resonance, the load capacitance should always be
specified. The load capacitance CL is the dynamic capacitance
of the total circuit.
PART
NUMBERING
KEY
SERIES
MM49
SM49
CORRELATION
L
M
N
O
Q
S
12 pF
15 pF
20 pF
32 pF
24 pF
Series
Resonant
X = Cust spec
=
=
=
=
=
=
1=
3=
5=
7=
MODE
Fundamental*
3rd Overtone
5th Overtone
7th Overtone
FREQUENCY
STABILITY
C =
!
50 ppm*
X = Cust spec
TEMP RANGE
PACKAGING
Std package
3rd lead, 0.5”
Tape & Reel
Insulating
sleeve
K = Insulating
spacer
X = Cust spec
A=
B=
E=
J =
FREQUENCY
(MHz)
3 =
-201C~701C*
9 = Cust spec
Sample Part Number
MM49N1C3A
@ 14.31818 MHz =
SM49N1C3A
@ 16.0 MHz
* Standard
MM49
MM49
N
N
1
1
C
C
3
3
A
A
14.31818
16.0
=
Call factory for additional options. Use full descriptive part number when ordering. Parts will be marked with series and frequency only.
Monitor Products Company Inc reserves the right to make changes to its products and product specifications without notice. No liability is assumed as a result of their use or application.
07-02-01
502 VIA DEL MONTE, OCEANSIDE, CA 92054
TEL:
760.433.4510
FAX:
760.434.0255
stm32/stm8
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