3280_03 Datasheet, PDF (1/12 Pages) Allegro MicroSystems – CHOPPER-STABILIZED, PRECISION HALL-EF FECT LATCHES

3280, 3281,
AND 3283
Suffix '–LT' & '–UA' Pinning
(SOT89/TO-243AA & ultra-mini SIP)
X
PTCT
V
CC
1
2
3
Dwg. PH-003-2
CHOPPER-STABILIZED, PRECISION
HALL-EFFECT LATCHES
The A3280--, A3281--, and A3283-- Hall-effect latches are extremely
temperature-stable and stress-resistant sensors especially suited for op-
eration over extended temperature ranges to +150°C. Superior high-tem-
perature performance is made possible through dynamic offset cancella-
tion, which reduces the residual offset voltage normally caused by device
overmolding, temperature dependencies, and thermal stress. The three
devices are identical except for magnetic switch points.
Each 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. A north pole is necessary to turn the output off. An on-board regula-
tor permits operation with supply voltages of 4.2 to 24 volts.
Three package styles provide a magnetically optimized package for
most applications. Package type LH is a modified SOT23W surface-
mount package, LT is a miniature SOT89/TO-243AA transistor package
for surface-mount applications; while UA is a three-lead ultra-mini-SIP
for through-hole mounting. Each package type is also available in a lead
(Pb) free version (suffix, –T) , with a 100% matte tin plated leadframe.
Pinning is shown viewed from branded side.
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
Range ‘E’ ..................... -40°C to +85°C
Range ‘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
■ Symmetrical Switch Points
■ Resistant to Physical Stress
■ Superior Temperature Stability
■ Output Short-Circuit Protection
■ Operation From Unregulated Supply
■ Reverse Battery Protection
■ Solid-State Reliability
■ Small Size