Allegro A3189LUA, A3189LU, A3189LLT, A3189EUA, A3189EU Datasheet

HALL-EFFECT LATCHES

FOR HIGH-TEMPERATURE OPERATION

These Hall-effect latches are extremely temperature-stable and stress­resistant 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/TO-243AA transistor package for surface-mount applications; suffix ‘–U’
is a three-lead plastic mini-SIP, while suffix ‘–UA’ is a three-lead ultra-mini­SIP.

Data Sheet

27609.2A

ABSOLUTE MAXIMUM RATINGS

at TA = +25°C

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

Reverse Battery Voltage, V

RCC

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

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

Output OFF Voltage, V

OUT

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

Reverse Output Voltage, V

OUT

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

Continuous Output Current, I

OUT

..... 25 mA

Operating Temperature Range, T

A

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

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

Storage Temperature Range,

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

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

Pinning is shown viewed from branded side.

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

Dwg. PH-003A

1

SUPPLY

V

CC

GROUND

32

OUTPUT

X

3185

THRU

3189

HALL-EFFECT LATCHES
FOR HIGH-TEMPERATURE
OPERATION

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

ELECTRICAL CHARACTERISTICS over operating temperature range, at V

CC

= 12 V.

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Supply Voltage V

CC

Operating 3.8 — 24 V

Output Saturation Voltage V

OUT(SAT)

I

OUT

= 20 mA, B > B

OP

— 175 400 mV

Output Leakage Current I

OFF

V

OUT

= 24 V, B < B

RP

— 0.05 5.0 µA

Supply Current I

CC

B < BRP (Output OFF) — 4.75 8.0 mA

B > B

OP

(Output ON) — 5.7 — mA

Output Rise Time t

r

RL = 820 Ω, CL = 20 pF — 100 — ns

Output Fall Time t

f

RL = 820 Ω, CL = 20 pF — 100 — ns

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

OP

at TA = 25°C 170 270 50 150 100 180 50 230

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

B

RP

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

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

B

hys

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

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

FUNCTIONAL BLOCK DIAGRAM

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

hys

= hysteresis (BOP - BRP).
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, U, or UA).

V

CC

X

REG.

Dwg. FH-005-3

GROUND

OUTPUT

1

3

2

Copyright © 1995, 1999, Allegro MicroSystems, Inc.

3185

THRU

3189

HALL-EFFECT LATCHES

FOR HIGH-TEMPERATURE

OPERATION

TYPICAL OPERATING CHARACTERISTICS

A3185* SWITCH POINTS A3187* SWITCH POINTS

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

OUTPUT SATURATION VOLTAGE

SUPPLY CURRENT

SUPPLY CURRENT

OPERATE POINT

0 50 100

AMBIENT TEMPERATURE IN °C

-50

Dwg. GH-027

SWITCH POINT IN GAUSS

0

50

100

-50

-100

OPERATE POINT

RELEASE POINT

V = 12 V

CC

150

150

-150

-25 25 75 125

0 25 50 75

100

AMBIENT TEMPERATURE IN °C

-50

Dwg. GH-028

125

-25

V = 12 V

CC

B ≤ B

RP

SUPPLY CURRENT IN mA

7.0

6.0

5.0

4.0

B ≥ B

OP

150

0255075

100

300

0

AMBIENT TEMPERATURE IN °C

200

100

-50

Dwg. GH-029

SATURATION VOLTAGE IN mV

150

-25

125

I = 20 mA

V = 4.5–24 V

OUT

CC

10 15 20 25

SUPPLY VOLTAGE IN VOLTS

0

Dwg. GH-037

5

CHANGE IN OPERATE POINT IN GAUSS

-5.0

0

5.0

10

15

20

T = +25°C

A

0 50 100

AMBIENT TEMPERATURE IN °C

-50

Dwg. GH-026

SWITCH POINT IN GAUSS

0

100

200

-100

-200

OPERATE POINT

RELEASE POINT

V = 12 V

CC

150

300

-300

-25 25 75 125

10 15 20 25

SUPPLY VOLTAGE IN VOLTS

0

Dwg. GH-030

5

SUPPLY CURRENT IN mA

0

2.0

4.0

6.0

8.0

10

B ≥ B

OP

B ≤ B

RP

T = +25°C

A