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Honeywell International Electronic Components Datasheet

SM451R Datasheet

Magnetoresistive Sensor

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Magnetoresistive Sensor ICs
Standard Power Series: SM351RT, SM451R, SM353RT, SM453R
32304118
Issue C
SM451R
SM453R
SM351RT
SM353RT
DESCRIPTION
Honeywell’s Magnetoresistive Sensor ICs (integrated circuits),
Standard Power Series, are ultra-sensitive devices designed
for manufacturers who need a durable and reliable speed or
position sensor for large air gaps or small magnetic fields in
standard power (typically 3 Vdc to 24 Vdc) applications. Unlike
reed switches and other magnetic sensors, Honeywell’s solid
state design offers ultra-high sensitivity of 11 G max., making it
the highest sensitivity sensor in its class for standard powered
applications. The Magnetoresistive Sensor ICs, Standard Power
Series, respond to either a North or South pole applied in a
direction parallel to the sensor. They do not require the magnet
polarity to be identified, simplifying installation and potentially
reducing system cost.
VALUE TO CUSTOMERS
• Durable and reliable due to magnetic solid state, non-contact,
no-glass design which enhance switching capability.
• Cost-effective and flexible due to the sensor IC’s ultra-high
sensitivity—the highest sensitivity sensor in its class for
standard powered applications—which lowers the customer’s
cost of magnets and simplifies design-in.
• Simplifies design-in for wired applications due to its supply
voltage range, omnipolar operation, SOT-23 and flat TO-92-
style package options and wide operating temperature range.
DIFFERENTIATION
Ultra-high sensitivity (SM351RT and SM451R) allows for
potential use in applications requiring ultra-high magnetic
sensitivity (7 G typical operate, 11 G maximum operate).
Datasheet
FEATURES
• Magnetic sensitivities:
- Ultra-high sensitivity (SM351RT and SM451R): For
applications requiring ultra-high magnetic sensitivity
(7 G typical operate, 11 G maximum operate)
- Very high sensitivity (SM353RT and SM453R): For
applications requiring very high magnetic sensitivity
(14 G typical operate, 20 G maximum operate)
• Package styles:
- SOT-23 (SM351RT, SM353RT)
- Flat TO-92-style (SM451R, SM453R)
• Supply voltage range 3 Vdc to 24 Vdc
• Omnipolar sensing activates with either pole from a magnet
• Temperature range -40 °C to 85 °C [-40 °F to 185 °F]
• SOT-23 supplied on tape and reel (3000 units per reel)
• RoHS-compliant materials meet Directive 2002/95/EC
POTENTIAL APPLICATIONS
Industrial
• High frequency flow sensing in HVAC, water, fuel meters,
and gas utility meters
• Anti-tamper detection in water, electric, and gas utility
meters
• Liquid level detection
• Motor RPM sensing
• In-cylinder position sensing
Medical
• RPM sensing in exercise and rehabilitation equipment
• Magnetic interrupt in exercise and rehabilitation equipment
• Absence/presence detection in infusion pumps
• Position sensing of medication dispensing cabinet drawers
• Incline position sensing in hospital beds
White Goods
• Lid, door and drawer position detection
• Fluid flow detection
• Liquid level detection
PORTFOLIO
Honeywell’s Standard Power Series join:
• Magnetoresistive sensor ICs, including the Nanopower
Series, 2SS52M Series, SS552MT Series
• Hall-effect sensor ICs, including the SS351A, SS451A
Sensing and Productivity Solutions


Honeywell International Electronic Components Datasheet

SM451R Datasheet

Magnetoresistive Sensor

No Preview Available !

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.)
CCharacteristic
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
8
2.5
3.5
mA
4
5
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
Table 2. Magnetic Specifications (3 V < Vcc < 24 V, -40 °C < Ta < 85 °C [-40 °F < Ta < 185 °F].)
Characteristic
Min.
Typ.
Max.
SM351RT, SM451R:
operate (positive)
release (positive)
differential
3
7
11
2
4.8
9
2.2
Unit
Gauss
SM353RT, SM453R:
operate (positive)
release (positive)
differential
6
14
20
Gauss
3
9.3
18
5.7
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.
Table 3. Absolute Maximum Ratings
C Characteristic
Operating temperature
Soldering temperature:
SM351RT, SM353RT
SM451R, SM453R
Supply voltage (Vs)
Load current
Condition
ambient
ambient applied for < 10 s
ambient applied for < 3 s
output sinking (open collector)
Min.
Typ.
Max.
Unit
-40 [-40]
85 [185]
°C [°F]
245 [473]
°C [°F]
260 [500]
-26
26
V
40
mA
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.
CAUTION
ELECTROSTATIC
SENSITIVE
DEVICES
DO NOT OPEN OR HANDLE
EXCEPT AT A
STATIC FREE WORKSTATION
ESD SENSITIVITY:
CLASS 3A
2 Sensing and Productivity Solutions


Part Number SM451R
Description Magnetoresistive Sensor
Maker Honeywell
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SM451R Datasheet PDF






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