3240 Datasheet, PDF (1/10 Pages) Allegro MicroSystems – CHOPPER-STABILIZED, PRECISION HALL-EFFECT SWITCH

3240
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT SWITCH
Suffix ‘–LT’ & ‘–UA’ Pinning
(SOT89/TO-243AA & ultra-min SIP)
PTCT
V
CC
1
2
3
Dwg. PH-003-2
Pinning is shown viewed from branded side.
The A3240-- Hall-effect switch is an extremely temperature-stable
and stress-resistant sensor especially suited for operation over extended
temperature ranges to +150°C. Superior high-temperature performance
is made possible through dynamic offset cancellation, which reduces the
residual offset voltage normally caused by device overmolding, tempera-
ture dependencies, and thermal stress.
The device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, small-signal amplifier, chopper stabilization,
Schmitt trigger, and a short-circuit protected open-collector output to
sink up to 25 mA. A south pole of sufficient strength will turn the
output on. An on-board regulator permits operation with supply voltages
of 4.2 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
‘L–’ is -40°C to +150°C. Three package styles provide a magnetically
optimized package for most applications. Suffix ‘–LH’ is a modified
SOT23W surface-mount package, ‘–LT’ is a miniature SOT89/TO-
243AA transistor package for surface-mount applications; while suffix
‘–UA’ is a three-lead ultra-mini-SIP for through-hole mounting.
ABSOLUTE MAXIMUM RATINGS
at T_A = +25°C
Supply Voltage, V_CC ........................ 26.5 V
Reverse Battery Voltage, V_RCC .......... -30 V
Magnetic Flux Density, B ........... Unlimited
Output OFF Voltage, V_OUT ................. 26 V
Continuous Output Current,
I_OUT .......................................... 25 mA*
Reverse Output Current, I_OUT ........ -50 mA
Package Power Dissipation, P_D . See Graph
Junction Temperature, T_J ............... +165°C
Operating Temperature Range, T_A
Suffix ‘E–’ .................. -40°C to +85°C
Suffix ‘L–’ ................ -40°C to +150°C
Storage Temperature Range,
T_S .............................. -65°C to +170°C
*Internal current limiting is intended to protect
the device from output short circuits.
FEATURES
s Resistant to Physical Stress
s Superior Temperature Stability
s Output Short-Circuit Protection
s Operation From Unregulated Supply
s Reverse Battery Protection
s Solid-State Reliability
s Small Size
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., A3240ELH .