2

Sensing and Productivity Solutions

Magnetoresistive Sensor ICs

Standard Power Series: SM351RT, SM451R, SM353RT, SM453R

Table 1. Electrical Specifications (3 V < Vcc < 24 V, -40 °C < Ta < 85 °C [-40 °F < Ta < 185 °F] unless otherwise specified.)

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

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

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

µA

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.

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.

Characteristic

Min.

Typ.

Max.

Unit

SM351RT, SM451R:

operate (positive)

release (positive)

differential

3

2

—

7

4.8

2.2

11

9

—

Gauss

SM353RT, SM453R:

operate (positive)

release (positive)

differential

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