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

Vdc

Vsupply = 3 V at 25 °C [77 °F]

Vsupply = 12 V at 25 °C [77 °F],

=1.6 kOhm, CL = 20 pF

– –

– – –

– –

3.5 –

– –

6 5

1.5

µs

1.5

– °C/W

303

–

gauss

240 350 460

–

gauss

135 250 370

–

gauss

30 100 170

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