Datasheet 3185 Datasheet (ALLEGRO)

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X

V

CC

1

SUPPLY

32

GROUND

Dwg. PH-003A

3185

THRU

3189

HALL-EFFECT LATCHES

FOR HIGH-TEMPERATURE OPERATION

These Hall-effect latches are extremely temperature-stable and stress-

resistant sensors especially suited for operation over extended temperature

ranges to +150°C. Superior high-temperature performance is made possible

through a novel Schmitt trigger circuit that maintains operate and release
point symmetry by compensating for temperature changes in the Hall ele­ment. Additionally, internal compensation provides magnetic switch points
that become more sensitive with temperature, hence offsetting the usual
degradation of the magnetic field with temperature. The symmetry capability
makes these devices ideal for use in pulse-counting applications where duty
cycle is an important parameter. The four basic devices (3185, 3187, 3188,
and 3189) are identical except for magnetic switch points.

Each device includes on a single silicon chip a voltage regulator, qua­dratic Hall-voltage generator, temperature compensation circuit, signal
amplifier, Schmitt trigger, and a buffered open-collector output to sink up to
25 mA. The on-board regulator permits operation with supply voltages of 3.8
to 24 volts.

The first character of the part number suffix determines the device

operating temperature range. Suffix ‘E–’ is for -40°C to +85°C, and suffix
‘L–’ is for -40°C to +150°C. Three package styles provide a magnetically

optimized package for most applications. Suffix ‘–LT’ is a miniature SOT89/

OUTPUT

TO-243AA transistor package for surface-mount applications; suffix ‘–UA’ is
a three-lead ultra-mini-SIP.

Data Sheet

27609.2B*

Pinning is shown viewed from branded side.

ABSOLUTE MAXIMUM RATINGS

at T

= +25°C

A

Supply Voltage, VCC............................ 30 V

Reverse Battery Voltage, V

Magnetic Flux Density, B ........... Unlimited

Output OFF Voltage, V
Reverse Output Voltage, V
Continuous Output Current, I
Operating Temperature Range, T

Suffix ‘E–’ ................... -40°C to +85°C

Suffix ‘L–’ ................. -40°C to +150°C

Storage Temperature Range,

T

............................... -65°C to +170°C

S

OUT

........... -30 V

RCC

.................. 30 V

.......... -0.5 V

OUT

..... 25 mA

OUT

A

FEATURES

■ Symmetrical Switch Points

■ Superior Temperature Stability

■ Operation From Unregulated Supply

■ Open-Collector 25 mA Output

■ Reverse Battery Protection

■ Activate With Small, Commercially Available Permanent Magnets

■ Solid-State Reliability

■ Small Size

■ Resistant to Physical Stress

Always order by complete part number: the prefix ‘A’ + the basic four-digit
part number + a suffix to indicate operating temperature range +
a suffix to indicate package style, e.g., A3185ELT .

3185

THRU

3189

HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION

FUNCTIONAL BLOCK DIAGRAM

V

1

CC

REG.

X

3

OUTPUT

2

GROUND

Dwg. FH-005-3

ELECTRICAL CHARACTERISTICS over operating temperature range, at V

= 12 V.

CC

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V

Output Saturation Voltage V

OUT(SAT)

Output Leakage Current I

Supply Current I

Output Rise Time t

Output Fall Time t

CC

OFF

CC

r

f

Operating 3.8 — 24 V

I

= 20 mA, B > B

OUT

V

= 24 V, B < B

OUT

OP

RP

— 175 400 mV

— 0.05 5.0 µA

B < BRP (Output OFF) — 4.75 8.0 mA

B > B

R

R

(Output ON) — 5.7 — mA

OP

= 820 Ω, C

L

= 820 Ω, C

L

= 20 pF — 100 — ns

L

= 20 pF — 100 — ns

L

MAGNETIC CHARACTERISTICS in gauss over operating supply voltage range.

Part Numbers*

A3185 A3187 A3188 A3189

Characteristic Min. Max. Min. Max. Min. Max. Min. Max.

B

at T

OP

B

RP

B

hys

= 25°C 170 270 50 150 100 180 50 230

A

over operating temp. range 140 300 50 175 80 200 50 250

at T

= 25°C -270 -170 -150 -50 -180 -100 -230 -50

A

over operating temp. range -300 -140 -175 -50 -200 -80 -250 -50

at T

= 25°C 340 540 100 300 200 360 100 460

A

over operating temp. range 280 600 100 350 160 400 100 500

NOTES: BOP = operate point (output turns ON); BRP = release point (output turns OFF); B

As used here, negative flux densities are defined as less than zero (algebraic convention).
*Complete part number includes a suffix to identify operating temperature range (E or L) and package type ( LT or UA).

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Copyright © 1995, 2002 Allegro MicroSystems, Inc.

= hysteresis (BOP - BRP).

hys

300

3185

THRU

HALL-EFFECT LATCHES

FOR HIGH-TEMPERATURE

OPERATION

TYPICAL OPERATING CHARACTERISTICS

A3185* SWITCH POINTS A3187* SWITCH POINTS

150

3189

200

100

0

-100

SWITCH POINT IN GAUSS

-200

-300

-50

OPERATE POINT

RELEASE POINT

0 50 100

-25 25 75 125

AMBIENT TEMPERATURE IN °°°°C

OUTPUT SATURATION VOLTAGE

300

I = 20 mA

OUT

V = 4.5–24 V

CC

200

100

SATURATION VOLTAGE IN mV

V = 12 V

CC

150

Dwg. GH-026

100

50

0

-50

OPERATE POINT

SWITCH POINT IN GAUSS

-100

-150

-25 25 75 125

-50

0 50 100

AMBIENT TEMPERATURE IN °°°°C

SUPPLY CURRENT

7.0

6.0

5.0

SUPPLY CURRENT IN mA

B ≥ B

OP

V = 12 V

CC

RELEASE POINT

B ≤ B

Dwg. GH-027

V = 12 V

CC

RP

150

0

-50

10

8.0

6.0

4.0

0255075

-25

AMBIENT TEMPERATURE IN °°°°C

SUPPLY CURRENT

B ≥ B

OP

B ≤ B

100

RP

125

150

Dwg. GH-029

4.0

-50

20

15

10

5.0

0 25 50 75

-25

AMBIENT TEMPERATURE IN °°°°C

OPERATE POINT

100

T = +25°C

A

125

SUPPLY CURRENT IN mA

2.0

T = +25°C

A

0

CHANGE IN OPERATE POINT IN GAUSS

0

0

5

10 15 20 25

SUPPLY VOLTAGE IN VOLTS

Dwg. GH-030

-5.0
0

5

10 15 20 25

SUPPLY VOLTAGE IN VOLTS

* Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LT or UA).

www.allegromicro.com

150

Dwg. GH-028

Dwg. GH-037

3185

THRU

3189

HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION

SENSOR LOCATIONS

(±0.005” [0.13 mm] die placement)

Package Designators “LT”

ACTIVE AREA DEPTH

0.0305"

0.775 mm
NOM

0.090"

2.27 mm

0.050"

1.27 mm

A

1 32

Dwg. MH-008-4C

Package Designators “UA”

ACTIVE AREA DEPTH

0.0195"

0.50 mm
NOM

0.083"

2.10 mm

0.060"

1.51 mm

A

BRANDED
SURFACE

Although sensor location is accurate to three
sigma for a particular design, product improve­ments may result in small changes to sensor
location.

1 32

Dwg. MH-011-4C

OPERATION

In operation, the output transistor is OFF until the strength of the mag­netic field perpendicular to the surface of the chip exceeds the threshold or
operate point (BOP). When the field strength exceeds BOP, the output transis­tor switches ON and is capable of sinking 25 mA of current.

The output transistor switches OFF when magnetic field reversal results
in a magnetic flux density below the OFF threshold (BRP). This is illustrated
in the transfer characteristics graph (A3187* shown).

Note that the device latches; that is, a south pole of sufficient strength
will turn the device ON. Removal of the south pole will leave the device ON.
The presence of a north pole of sufficient strength is required to turn the
device OFF. Powering up in the absence of a magnetic field (less than B
and higher than BRP) will allow an indeterminate output state. The correct
state is warranted after the first excursion beyond BOP or BRP.

V

30 V
MAX

OUTPUT VOLTAGE IN VOLTS

BB

B

RP

0

-B

FLUX DENSITY

B

OP

V

OUT(SAT)

0+B

Dwg. GH-034-4

The simplest form of magnet that will operate these devices is a ring

magnet, as shown below. Other methods of operation are possible.

OP

Allegro

Dwg. A-11,899

APPLICATIONS INFORMATION

Extensive applications information on magnets and Hall-effect sensors is
also available in the Allegro Integrated and Discrete Semiconductors Data
Book or Application Note 27701.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

HALL-EFFECT LATCHES

FOR HIGH-TEMPERATURE

PACKAGE DESIGNATOR ‘LT’

(SOT89/TO-243AA)

3185

THRU

3189

OPERATION

0.167

0.155

0.047

0.035

0.059

BSC

1

Dimensions in Inches

(for reference only)

0.181

0.173

0.072

0.064

0.102

0.0221

0.0173

0.090

0.0189

0.0142

23

0.118

BSC

0.063

0.055

0.090

0.084

0.0173

0.0138

Dwg. MA-009-3A in

4.25

3.94

1.20

0.89

1.50

BSC

Dimensions in Millimeters

(controlling dimensions)

4.60

4.40

1.83

1.62

2.60

0.56

0.44

2.29

0.48

0.36

1

23

3.00

BSC

1.60

1.40

2.29

2.13

0.44

0.35

Dwg. MA-009-3A mm

0.098

0.079

B

1

0.028

TYP

Pads 1, 2, 3, and A — Standard SOT89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning

0.031

A

2

0.102

0.181

0.047

3

0.031

TYP

Dwg. MA-012-3 in

Pads 1, 2, 3, and A — Standard SOT89 Layout
Pads 1, 2, 3, and B — Low-Stress Version
Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning

B

13

0.7

TYP

NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown.

2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel.

3. Only low-temperature (≤240°C) reflow-soldering techniques are recommended for SOT89 devices.

www.allegromicro.com

2.5

2.0

A

2

0.8

2.6

1.2

0.8

TYP

4.6

Dwg. MA-012-3 mm

3185

THRU

3189

HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION

PACKAGE DESIGNATOR ‘UA’

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

SEE NOTE

45°

0.122

0.117

0.640

0.600

0.085

123

MAX

0.164

0.159

0.050

BSC

0.062

0.058

0.031

0.0189

0.0142

0.0173

0.0138

Dwg. MH-014E in

45°

SEE NOTE

45°

3.10

2.97

16.26

15.24

2.16

123

MAX

4.17

4.04

1.27

BSC

1.57

1.47

45°

0.79

0.44

0.35

0.48

0.36

Dwg. MH-014E mm

NOTES: 1. Tolerances on package height and width represent

allowable mold offsets. Dimensions given are
measured at the widest point (parting line).

2. Exact body and lead configuration at vendor’s option
within limits shown.

3. Height does not include mold gate flash.

4. Recommended minimum PWB hole diameter to clear
transition area is 0.035" (0.89 mm).

5. Where no tolerance is specified, dimension is nominal.

6. Supplied in bulk pack (500 pieces per bag).

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Radial Lead Form (order A318xxUA-LC)

123

0.620"

0.500"

(15.7 mm

12.7 mm)

0.100"

(2.5 mm)

NOTE: Lead-form dimensions are the nominals produced on the

forming equipment. No dimensional tolerance is implied or
guaranteed for bulk packaging (500 pieces per bag).

0.108"

(2.74 mm)

Dwg. MH-026

3185

THRU

3189

HALL-EFFECT LATCHES

FOR HIGH-TEMPERATURE

OPERATION

www.allegromicro.com

The products described herein are manufactured under one or more of the
following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179;
5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130;
5,917,320; and other patents pending.

Allegro MicroSystems, Inc. reserves the right to make, from time to time, such
departures from the detail specifications as may be required to permit improvements
in the performance, reliability, or manufacturability of its products. Before placing
an order, the user is cautioned to verify that the information being relied upon is
current.

Allegro products are not authorized for use as critical components in life-support
appliances, devices, or systems without express written approval.

The information included herein is believed to be accurate and reliable. How­ever, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any
infringements of patents or other rights of third parties that may result from its use.

3185

THRU

3189

HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION

HALL-EFFECT SENSORS

LATCHING HALL-EFFECT DIGITAL SWITCHES

Partial Operate Release Hysteresis Replaces

Part Point (G) Point (G) (G) Oper. and

Number

UGN3175 15 to 180 -180 to -15 >80 (Typ 180) S LT, UA
UGN3177 25 to 150 -150 to -25 >50 (Typ 180) S LT, UA

A3185x 140 to 300 -300 to -140 280 to 600 E/L LT, UA
A3187x 50 to 175 -175 to -50 100 to 350 E/L LT, UA 3077, 3175, 3177
A3188x 80 to 200 -200 to -80 160 to 400 E/L LT, UA
A3189x 50 to 250 -250 to -50 100 to 500 E/L LT, UA 3075, 3076
A3280x 5 to 40 -40 to -5 10 to 80 E/L LH, LT, UA chopper stabilized
A3281x 15 to 90 -90 to -15 30 to 180 E/L LH, LT, UA chopper stabilized
A3283x 100 to 180 -180 to -100 <400 (Typ 300) E/L LH, LT, UA chopper stabilized

Over Oper. Voltage & Temp. Range

“PROTECTED” LATCHING HALL-EFFECT DIGITAL SWITCHES

Temp. Packages Comments

Partial Operate Release Hysteresis

Part Point (G) Point (G) (G) Oper.

Number

A3195x 40 to 200 -200 to -40 >110 (Typ 220) E, L U, LT active pulldown
A3197x 40 to 200 -200 to -40 >110 (Typ 230) E, L U, LT open-collector output

Notes: 1) Typical data is at T

2) “x” = Operating Temperature Range [suffix letter or (prefix)]: S (UGN) = -20°C to +85°C, E = -40°C to +85°C,
J = -40°C to +115°C, K (UGS) = -40°C to +125°C, L (UGL) = -40°C to +150°C.

Over Oper. Voltage & Temp. Range

= +25°C and nominal operating voltage.

A

Temp. Packages Comments

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]