Honeywell SS351AT, SS451A User Manual

DESCRIPTION

FEATURES

POTENTIAL APPLICATIONS

The SS351AT and SS451A sensors are small, versatile digital
Hall-effect devices that are operated by the magnetic field from
a permanent magnet or an electromagnet. They are designed
to respond to a either a North pole or a South pole.

These omnipolar sensors are sensitive and flexible devices
designed to meet a wide range of potential applications. The
SS351AT and SS451A have a typical operating point of 85 G
at 25 °C [77 °F]. Because they can be operated by a North
pole or a South pole, they do not require the magnet polarity to
be identified, thus making the installation easier and potentially
reducing the system cost.

These sensors are available in two package styles. The
SS351AT is available in the subminiature SOT-23 surface
mount package; the SS451A is available in the leaded, flat TO­92-style package. The SS351AT’s small size requires less PC
board space, allowing it to be used in smaller assemblies. Its
3 Vdc capability allows for use in low voltage applications,
promoting energy efficiency.

The SS351AT is available on tape and reel (3000 units per
reel); the SS451A is available in a bulk package (1000 units
per bag).

Subminiature package size (SS351AT) supplied on tape

and reel allows for a compact design with automated
component placement, helping to reduce manufacturing
costs

Simple activation from a North pole or a South pole and

sensitive magnetics make this omnipolar product suitable
in a variety of potential motion control, lid closure
detection, and displacement sensing applications

Low voltage 3 Vdc capability helps reduce power

consumption

Built-in reverse polarity protection protects the device from

potential damage during installation

Thermally balanced integrated circuit provides for stable

operation over a wide temperature range of -40° to
150 °C [-40 °F to 302 °F]

RoHS-compliant materials meet Directive 2002/95/EC

Commercial:

Speed and RPM (revolutions per minute) sensing in

fitness equipment
Magnetic encoder for building access
Damper or valve position control in HVAC (heating,

ventilation and air conditioning) equipment
Flow rate sensing in appliances and water softeners
Printer head position sensing

Industrial:

Flow rate sensing in industrial processes
Robotic control (cylinder position monitoring)
Float-based fluid level sensing

Medical:

Displacement sensor in hospital beds and medical

equipment
Medication bin monitor on portable drug carts

Table 1. SS351AT/SS451A Specifications (At Vs=3.0 Vdc to 24 Vdc, 20 mA load, TA = -40 °C to 150 °C [-40 °F to 257 °F])

Characteristic

Condition

Minimum

Typical

Maximum

Unit

Supply voltage1:

Vdc

SS451A

-40 °C to 150 °C [-40 °F to 302 °F]

3 – 24

SS351AT

-40 °C to 125 °C [-40 °F to 257 °F]

3 – 24

SS351AT

150 °C [302 °F]

3 – 12

Supply current

Vsupply = 5 V at 25 °C [77 °F]
Vsupply = 3 V at 25 °C [77 °F]

–
–
–

4.5

3.5
–

6
5 9 mA

Output Current

–

– – 20.0

mA

Vsat

at 20 mA, gauss > Bop positive

or gauss < Bop negative

– – 0.4

V

Output leakage current

gauss > Bop+ or < Bop-

– – 10

µA

Output switching time:
rise
fall

Vsupply = 12 V at 25 °C [77 °F],

RL =1.6 KOhm, CL = 20 pF

–
–

–
–

1.5

1.5

µs

Thermal resistance:

–

°C/W

SS451A

–

233

–

SS351AT

–

303

–

SS351AT/SS451A:

–

gauss

Operate positive

35

85

135

Operate negative

-135

-85

-35

SS351AT/SS451A:

–

gauss

Release positive

10

50

120

Release negative

-120

-50

-10

SS351AT/SS451A

gauss

Differential

–

5

35

80

Operating temperature

–

-40 [-40]

–

150 [302]

°C [°F]

Storage temperature

–

-40 [-40]

–

150 [302]

°C [°F]

Characteristic

Minimum

Typical

Maximum

Unit

Supply voltage

-28.0

–

28.0

V

Applied output voltage

-0.5 – 28.0

V

Output current – –

20

mA

Magnetic flux – –

no limit

gauss

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.

Figure 1. SS351AT Rated Supply Voltage

Figure 2. Current Sinking Output Block Diagram

Note 1: See Figure 1.

Table 2. SS351AT/SS451A Absolute Maximum Ratings1

Note 1: 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.

2 www.honeywell.com/sensing

Figure 3. Typical SS351AT/SS451A Magnetic Performance vs Temperature

Figure 4. Wiring Diagrams

Figure 5. SS351AT Mounting/Tape and Reel Dimensions (For reference only. mm/[in])

Honeywell Sensing and Control 3

Sensing and Control
Honeywell
1985 Douglas Drive North
Golden Valley, MN 55422

www.honeywell.com/sensing

005917-1-EN IL50 GLO Printed in USA
November 2009
© 2009 Honeywell International Inc. All rights reserved.

Figure 6. SS451A Mounting Dimensions (For reference only. mm/[in])

Catalog Listing

Description

SS351AT

Omnipolar, Hall-effect digital position sensor, SOT-23 package, tape and reel packaging (3000 units per reel)

SS451A

Omnipolar, Hall-effect digital position sensor, flat TO-92 package, bulk packaging (1000 units per bag)

PERSONAL INJURY

DO NOT USE these products as safety or emergency stop
devices or in any other application where failure of the
product could result in personal injury.

Failure to comply with these instructions could result
in death or serious injury.

MISUSE OF DOCUMENTATION

The information presented in this product sheet is for

reference only. DO NOT USE this document as a
product installation guide.

Complete installation, operation, and maintenance

information is provided in the instructions supplied with
each product.

Failure to comply with these instructions could result
in death or serious injury.

Order Guide

WARRANTY/REMEDY

Honeywell warrants goods of its manufacture as being free of

defective materials and faulty workmanship. Honeywell’s

standard product warranty applies unless agreed to otherwise
by Honeywell in writing; please refer to your order
acknowledgement or consult your local sales office for specific
warranty details. If warranted goods are returned to Honeywell
during the period of coverage, Honeywell will repair or replace,
at its option, without charge those items it finds defective. The

foregoing is buyer’s sole remedy and is in lieu of all other

warranties, expressed or implied, including those of
merchantability and fitness for a particular purpose. In no
event shall Honeywell be liable for consequential, special,
or indirect damages.

While we provide application assistance personally, through
our literature and the Honeywell web site, it is up to the
customer to determine the suitability of the product in the
application.

Specifications may change without notice. The information we
supply is believed to be accurate and reliable as of this
printing. However, we assume no responsibility for its use.

SALES AND SERVICE

Honeywell serves its customers through a worldwide network
of sales offices, representatives and distributors. For
application assistance, current specifications, pricing or name
of the nearest Authorized Distributor, contact your local sales
office or:

E-mail: [e-mail]

Internet: www.honeywell.com/sensing

Phone and Fax:

Asia Pacific [phone]
[phone] Fax
Europe [phone]
[phone] Fax
Latin America [phone]
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USA/Canada [phone]
[phone]
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