Model 12M1A Piezoelectric accelerometer - OEM - Endevco

Model 12M1A
Piezoelectric accelerometer - OEM
Features
• Low cost/OEM applications
• High output efficiency
• Light weight (120 mg)
• For SMT installation
Description
The Endevco model 12M1A Picochip is a high performance
piezoelectric accelerometer packaged as a surface mount
chip component. The unit is engineered for integration in
standard hybrid or SMT electronics packages along with
custom designed signal conditioning circuits, allowing
the user to create miniaturized shock and vibration
measurement systems in one completely integrated package.
The model 12M1A features Endevco’s Piezite type P-8
bimorph sensing element, operating in the bender mode,
which provides low base strain sensitivity, low pyroelectric
output, and extremely high charge output versus size.
Contact to the sensing element is made through two thick
film gold metalized mounting pads on the bottom surface of
the alumina case. The unit is designed to be mounted with
conductive adhesives or solder. Since the model 12M1A is a
high impedance piezoelectric device, extreme care must be
exercised in shielding it from stray electromagnetic noise.
0.180 ±0.005
TYPICAL AMPLITUDE RESPONSE
30
25
20
15
0.150 ±0.005
% DEVIATION
10
5
0
-5
-10
0.055 ±0.010
-15
-20
-25
(-)
a
(+)
-30
1 10 100 1000 10000
FREQUENCY IN HERTZ
(-)
(+)
TYPICAL TEMPERATURE RESPONSE
40
mounting surface
CAPACITANCE
30
20
.080
.040
.080
.040
% DEVIATION
CHARGE SENSITIVITY
10
0
-10
All dimensions are in inches
Shaded areas denote gold metallization
(+) and (-) indicates output polarity for an acceleration indicated by the bold arrow
-20
-30
-100 0 100 200 300
(-73) (-18) (38) (93) (149)
TEMPERATURE °F (°C)

Model 12M1A
Piezoelectric accelerometer - OEM
Specifications
The following performance specifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75˚F (+24˚C) and 100 Hz,
unless otherwise noted. Calibration data, traceable to National Institute of Standards and Technology (NIST), is supplied
Dynamic characteristics
Units
Charge sensitivity pC/g 1.9
Minimum pC/g 1.4
Maximum pC/g 2.4
Frequency response
See typical amplitude response
Resonance frequency kHz 9
Amplitude response ±5% [1] Hz 1 to 2000
Temperature response
See typical curve
Transverse sensitivity % ≤5
Electrical characteristics
Output polarity Acceleration produces positive output on the (+) designated contact as shown in Figure 1
Capacitance pF 550 @ 1000 Hz
Environmental characteristics
Temperature range
-85˚F to +302˚F (-65˚C to +150˚C)
Processing temp (re-flow solder assy)
+446˚F (+230˚C), 30 seconds maximum
Shock limit g pk 1000
Physical characteristics
Dimensions
See outline drawing
Weight gm (oz) 0.12 (0.0042)
Base
Alumina with selective gold metalization
Cover
Alloy 42 gold plated
Mounting
Twin electrical contact for conductive epoxy or solder mounting
Notes:
1. Low-end system response is a function of the associated electronics.
2. Maintain high levels of precision and accuracy using Endevco’s factory calibration services.
Call Endevco’s inside sales force at 800-982-6732 for recommended intervals, pricing and
turn-around time for these services as well as for quotations on our standard products.
Continued product improvement necessitates that Endevco reserve the right to modify these specifications without notice. Endevco maintains a program
of constant surveillance over all products to ensure a high level of reliability. This program includes attention to reliability factors during product design,
the support of stringent Quality Control requirements, and compulsory corrective action procedures. These measures, together with conservative
specifications have made the name Endevco synonymous with reliability.
APPLIES TO CALIFORNIA FACILITY
©ENDEVCO CORPORATION. ALL RIGHTS RESERVED 30700 RANCHO VIEJO ROAD, SAN JUAN CAPISTRANO, CA92675 USA
(800) 982-6732 • (949) 493-8181 fax (949) 661-7231 • www.endevco.com • Email: applications@endevco.com 100509