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Installation Instructions for the
Magnetoresistive Sensor ICs
Standard Power Series: SM351RT, SM451R,
SM353RT, SM453R
32304117
Issue C
Table 1. Electrical Specifications (3 V < Vcc < 24 V, -40 °C < Ta < 85 °C [-40 °F < Ta < 185 °F] unless otherwise specified.)
Characteristic Condition Min. Typ. Max. Unit
Supply voltage (Vcc) Vcc reference to ground 3 12 24 V
Supply current:
off
on
—
Vcc = 5 V, T = 25 °C [77 °F]
Vcc = 5 V, T = 25 °C [77 °F
—
—
—
—
2.5
4
8
3.5
5
mA
Start-up time Vcc > 3 V — — 10 µs
Output leakage current Vcc = 24, off — — 10 µA
Output saturation voltage load current = 20 mA — — 500 mV
Rise time
Fall time
Vcc = 5 V, R = 2 kOhm, C = 20 pF
Vcc = 5 V, R = 2 kOhm, C = 20 pF
—
—
—
—
1.5
1.5
µs
NOTICE
The magnetic field strength (Gauss) required to cause the switch
to change state (operate and release) will be as specified in
the magnetic characteristics. To test the switch against the
specified magnetic characteristics, the switch must be placed in
a uniform magnetic field.
Table 2. Magnetic Specifications (3 V < Vcc < 24 V, -40 °C < Ta < 85 °C [-40 °F < Ta < 185 °F].)
Characteristic Min. Typ. Max. Unit
SM351RT, SM451R:
operate (positive)
release (positive)
hysteresis
3
2
—
7
4.8
2.2
11
9
—
Gauss
SM353RT, SM453R:
operate (positive)
release (positive)
hysteresis
6
3
—
14
9.3
5.7
20
18
—
Gauss
CAUTION
ELECTROSTATIC
SENSITIVE
DEVICES
DO NOT OPEN OR HANDLE
EXCEPT AT A
STATIC FREE WORKSTATION
ESD SENSITIVITY:
CLASS 3A
NOTICE
Absolute maximum ratings are the extreme limits that the device will withstand without damage
to the device. However, the electrical and mechanical characteristics are not guaranteed as the
maximum limits (above recommended operating conditions) are approached, nor will the device
necessarily operate at absolute maximum ratings.
Table 3. Absolute Maximum Ratings
Characteristic Condition Min. Typ. Max. Unit
Operating temperature ambient -40 [-40] — 85 [185] °C [°F]
Soldering temperature:
SM351RT, SM353RT
SM451R, SM453R
ambient applied for < 10 s
ambient applied for < 3 s
—
—
—
—
245 [473]
260 [500]
°C [°F]
Supply voltage (Vs) — -26 — 26 V
Load current output sinking (open collector) — — 40 mA
Sensing and Productivity Solutions
NOTICE
These magnetoresistive sensor ICs may have an initial output
in either the ON or OFF state if powered up with an applied
magnetic field in the differential zone (applied magnetic field
>Brp and <Bop). Honeywell recommends allowing 10 μs for
output voltage to stabilize after supply voltage has reached its
final rated value.
