Honeywell SS340RT, SS440R User Manual

SS340RT and SS440R
Series

Unipolar Hall-Effect Digital
Position Sensors

DESCRIPTION

The SS340RT Series and SS440R Series 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 single pole: North

(SS340RT Series) or South (SS440R Series).

These unipolar sensors are supplied in three different magnetic

sensitivities to meet a wide range of potential applications. The

SS341RT and SS441R offer the highest sensitivity, with a

typical operating point of 85 G at 25 °C [77 °F]; the SS343RT

and SS443R offer medium sensitivity with 125 G typical at

25 °C [77 °F]; the SS349RT and SS449R offer the lowest

sensitivity, requiring 350 G typical to operate at 25 °C [77 °F].

FEATURES/BENEFITS

• Subminiature package size (SS340RT Series) supplied on

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

• Simple activation from a single pole and multiple magnetic

sensitivities (high, medium and low) make this product
suitable in a variety of potential motion control, lid closure
detection, and displacement sensing applications

• Low voltage 3 V 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, from -40 °C to
150 °C [-40 °F to 302 °F]

• RoHS-compliant materials meet Directive 2002/95/EC

These sensors are available in two package styles. The

SS340RT Series is available in the miniature SOT-23 surface

mount package; the SS440R is available in the leaded, flat TO-

92-style package. The SS340RT’s small size requires less PC

board space, allowing it to be used in smaller assemblies. Its

3 V capability allows for use in low voltage applications,

promoting energy efficiency.

The SS340RT Series is available on tape and reel (3000 units

per reel); the SS440R Series is available in a bulk package

(1000 units per bag).

POTENTIAL APPLICATIONS

• Door or lid closure detection

• Speed and RPM (revolutions per minute) sensing in

fitness equipment

• Flow rate sensing in industrial processes, appliances, or

water softeners

• Damper or valve position control in industrial, HVAC or

residential or commercial applications

• Robotic control (cylinder position monitoring)

• Float-based fluid level sensing

• Displacement sensor in hospital beds or medical

equipment

• Medication bin monitor on portable drug carts

• Printer head position sensing

SS340RT and SS440R Series

Table 1. SS340RT and SS440R Series Specifications (At Vs=3.0 to 24 Vdc, 20 mA load, TA = -40 ºC to 150 ºC [-40 ºF to 257 ºF])

Characteristic Condition Minimum Typical Maximum Unit

Supply voltage:
SS440R Series -40 °C to 150 °C [-40 °F to 302 °F] 3 – 24
SS340RT Series -40 °C to 125 °C [-40 °F to 257 °F] 3 – 24
SS340RT Series 150 °C [302 °F] 3 – 12
Supply current Vsupply = 5 V at 25 °C [77 °F]

Vsat at 20 mA, gauss >Bop – – 0.4 Vdc
Output leakage current gauss >Bop – – 10 µA

Output switching time:
rise
fall
Thermal resistance:
SS440R Series 233
SS340RT Series
Operate:
SS341RT/SS441R 35 85 135
SS343RT/SS443R 45 125 205
SS349RT/SS449R
Release:
SS341RT/SS441R 10 50 120
SS343RT/SS443R 40 90 180
SS349RT/SS449R
Differential:
SS341RT/SS441R 5 35 80
SS343RT/SS443R 5 35 120
SS349RT/SS449R

Operating temperature – -40 [-40] – 150 [302] °C [°F]
Storage temperature – -40 [-40] – 150 [302] °C [°F]

Note 1. See Figure 1.

Table 2. SS340RT and SS440R Series Absolute Maximum Ratings

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

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.

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. SS340RT Series Rated Supply Voltage Figure 2. Current Sinking Output Block Diagram

1

Vdc

Vsupply = 3 V at 25 °C [77 °F]

Vsupply = 12 V at 25 °C [77 °F],

=1.6 kOhm, CL = 20 pF

R

L

– –

–
–
–

–
–

4

3.5
–

–
–

6
5

mA

8

1.5

µs

1.5

– °C/W

303

–

gauss

240 350 460

–

gauss

135 250 370

–

gauss

30 100 170

1

2 www.honeywell.com/sensing

Figure 3. Wiring Diagrams

Unipolar Hall-Effect Digital Position Sensors

Figure 4. SS340RT Series Mounting/Tape and Reel Dimensions (For reference only. mm/[in])

Figure 5. SS440R Series Mounting Dimensions (For reference only. mm/[in])

Honeywell Sensing and Control 3

Order Guide

Catalog Listing Description

SS341RT SS340RT Series, unipolar, Hall-effect digital position sensor, high sensitivity, SOT-23 package, tape and

reel packaging (3000 units per reel)

SS343RT SS340RT Series, unipolar, Hall-effect digital position sensor, medium sensitivity, SOT-23 package, tape and

reel packaging (3000 units per reel)

SS349RT SS340RT Series, unipolar, Hall-effect digital position sensor, low sensitivity, SOT-23 package, tape and reel

packaging (3000 units per reel)

SS441R SS440R Series, unipolar, Hall-effect digital position sensor, high sensitivity, flat TO-92 package, bulk

packaging (1000 units per bag)

SS443R SS440R Series, unipolar, Hall-effect digital position sensor, medium sensitivity, flat TO-92 package, bulk

packaging (1000 units per bag)

SS449R SS440R Series, unipolar, Hall-effect digital position sensor, low sensitivity, flat TO-92 package, bulk

packaging (1000 units per bag)

WARNING

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.

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.

WARNING

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.

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]
[phone] Fax
USA/Canada [phone]
[phone]
[phone] Fax

Sensing and Control

Honeywell

1985 Douglas Drive North

Golden Valley, MN 55422

www.honeywell.com/sensing

005909-1-EN IL50 GLO Printed in USA
September 2009
© 2009 Honeywell International Inc. All rights reserved.