2-6 Accelerometer – Unamplified
Model 3031
PC Board Mountable Accelerometer
Millivolt Output
Small Size
Low Cost
Vibration/Shock Monitoring
Consumer Electronics
Patient Monitoring
Crash Recorder
FEATURES
Surface Mount Package
±0.5% Non-linearity (typical)
±1.0% Temperature Performance
(with comp resistors—typical)
DC Response
Built-in Damping
Built-in Overrange Stops
Low Power
STANDARD RANGES
Range g
±50 ●
±100 ●
±200 ●
±500 ●
DESCRIPTION
The Model 3031 is a piezoresistive silicon accelerometer in a
surface mount package. It is intended for high volume applica-
tions where small size, light weight, and low cost are required.
This accelerometer consists of a micro machined silicon
mass suspended by multiple beams from a silicon frame.
Piezoresistors located in the beams change their resistance as the
motion of the suspended mass changes the strain in the beams.
Silicon caps on the top and bottom of the device are added to
provide over-range stops. This design provides for a very low
profile, high shock resistance, durability and built-in damping
over a wide usable bandwidth.
For non-surface mount accelerometers please see the
Models 3022, 3028, 3052 or 3058.
DIMENSIONS
PC Board Mountable Accelerometer Model 3031
Accelerometer – Unamplified 2-7
June 2001
PERFORMANCE SPECIFICATIONS
Supply Voltage: 5.0 VDC
Ambient Temperature: 25°C (Unless otherwise specified)
Notes
1. The frequency response is defined as the range of frequencies over
which the device sensitivity is within ±5% of the DC value.
2. Output voltage increases for positive acceleration; output voltage
decreases for negative acceleration.
3. Best Fit Straight Line.
4. Percentage values are with external compensation.
5. Compensated temperature range: 0-50°C in reference to 25°C.
6. 10 Hz to 1 kHz.
7. 20X or 2000g, whichever is less.
8. Solder on pads is 62% Tin, 36% Lead, 2% Silver. Maximum allowable
temperature during mounting is 220°C for 1 minute. Contact factory if a
higher mounting temperature will be used.
ORDERING INFORMATION CONNECTIONS
PARAMETERS
RANGE
UNITS NOTES±50G ±100G ±200G ±500G
Frequency Response [MIN] 0-1000 0-1500 0-2000 0-2400 Hz 1
Mounted Resonant Frequency [MIN] 2000 3000 4000 5000 Hz
Sensitivity (MIN/MAX) 0.6/1.5 0.3/0.6 0.15/0.3 0.06/0.15 mV/g 2
PARAMETERS MIN TYP MAX UNITS NOTES
Zero Acceleration Output 525 ±mV
Damping Ratio 0.4 0.7 0.9
Non-linearity 0.5 1±% Span 3
Transverse Sensitivity 1 3 ±% Span
Input & Output Resistance 2.5 3.5 6.5 kΩ
Temperature Error - Span 1.0 2.0 ±% Span 4, 5
Temperature Error - Zero 1.0 2.0 ±% Span 4, 5
Supply Voltage 5.0 10.0 VDC
Output Noise 1.0 µV p-p 6
Output Load Resistance 5 MΩ
Acceleration Limits (Any Direction) 20X Rated 7
Operating Temperature -40°C to +125°C
Storage Temperature -55°C to +150°C
Weight 0.3 Grams
Feel free to contact customer service with any questions at
Toll free 1(800)745-8008; Phone (757)766-1500; Fax (757)766-4297
