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© 2007
BCM SENSOR
 

Semiconductor Strain Gauges

1. Descriptions and Gauge Configurations

Based on piezoresistive effect, BCM semiconductor strain gauges are made from p-type doped silicon wafer, and manufactured in two types: bar-type and backing-type. When gauges are made in the bar-type, they are naked gauges (SN-series), while made in the backing-type, the gauges are backed with phenolic-resin (SB-series).

The semiconductor gauges are manufactured of three different dimensions ("1", "2" and "3") and the gauge leads can be finished in different lead-configuration. Illustrated on the top, are some SB-series backed-gauges of type 2 lead-configuration.

BCM semiconductor strain gauges are listed according to their part number (P/N). For information on the gauge P/N and the detailed explanation of gauge lead-configuration, please refer to Semiconductor Gauge Coding System and Lead-Configuration.

The gauges of different gauging factors and electrical resistances, are available in stock for quick delivery.


2. Gauge Types and Physical Dimensions

Gauge P/N
Gauge Type
Gauge Length
Crystal Width
Crystal Thickness
Backing (L x W)
SB 1 - ## -P- *
backed-gauge
3.8 mm
0.3 mm
0.05 mm
5 mm x 3 mm
SB 2 - ## -P- *
backed-gauge
5 mm
0.4 mm
0.06 mm
8 mm x 5 mm
SB 3 - ## -P- *
backed-gauge
6 mm
0.5 mm
0.06 mm
9 mm x 6 mm
SN 1 - ## -P- *
naked-gauge
3.8 mm
0.3 mm
0.05 mm
no backing
SN 2 - ## -P- *
naked-gauge
5 mm
0.4 mm
0.06 mm
no backing
SN 3 - ## -P- *
naked-gauge
6 mm
0.5 mm
0.06 mm
no backing

"1", "2" and "3" identify the gauge dimensions, "##" stands for the gauge resistance, and " * " for the gauge lead-configuration.

3. Technical Specifications

Gauge P/N

R*

GF**

TCR***
(1/°C)

TCGF****
(1/°C)

Working Current
(mA)

Working Temp
(°C)

Strain Limit (µe)
SB (SN) # -15-P- *
15
75 +/- 5%
< 0.08%
< 0.12%
< 25
< 80
6000
SB (SN) # -25-P- *
25
75 +/- 5%
< 0.08%
< 0.12%
< 25
< 80
6000
SB (SN) # -30-P- *
30
80 +/- 5%
< 0.08%
< 0.12%
< 25
< 80
6000
SB (SN) # -60-P- *
60
100 +/- 5%
< 0.08%
< 0.12%
< 25
< 80
6000
SB (SN) # -120-P- *
120
110 +/- 5%
< 0.15%
< 0.15%
< 25
< 80
6000
SB (SN) # -200-P- *
200
120 +/- 5%
< 0.15%
< 0.15%
< 20
< 80
6000
SB (SN) # -350-P- *
350
130 +/- 5%
< 0.35%
< 0.28%
< 15
< 80
6000
SB (SN) # -600-P- *
600
140 +/- 5%
< 0.4%
< 0.3%
< 12
< 80
6000
SB (SN) # -1000-P- *
1000
150 +/- 5%
< 0.4%
< 0.3%
< 12
< 80
6000

# : indication of gauge dimensions
* R = gauge resistance in Ohms @ 32 °C.
** GF = gauge factor (strain sensitivity) @ 32 °C.
*** TCR = temperature coefficient of resistance @ 32 °C.
**** TCGF = temperature coefficient of gauge factor @ 32 °C.

The gauge specifications and physical dimensions are subject to change without notice.

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