The A3213xx and A3214xx integrated circuits are ultra-sensitive, pole
in de pen dent Hall-effect switches with a latched digital output. They are
es pe cial ly suited for operation in battery-operated, hand-held equip ment such
as cellular and cordless tele phones, pagers, and palmtop com put ers. A 2.4 volt
to 5.5 volt operation and a unique clocking scheme reduce the average op er -
at ing power requirements – the A3213xx to 825 µW, the A3214xx to 14 µW
(typical at 2.75 V)! Except for operating duty cycle and average operating
current, the A3213xx and A3214xx are identical.
Unlike other Hall-effect switches, either a north or south pole of suf fi cient
strength will turn the output on; in the absence of a magnetic field, the output
is off. The polarity independence and minimal power requirement allows
these devices to easily replace reed switches for superior reliability and ease of
manufacturing, while eliminating the requirement for signal conditioning.
Improved stability is made possible through chopper stabilization (dy-
nam ic offset cancellation), which reduces the residual offset voltage normally
caused by device overmolding, temperature de pen den cies, and thermal stress.
These devices include on a single silicon chip a Hall-voltage generator,
small-signal amplifier, chopper sta bi li za tion, a latch, and a MOSFET output.
Advanced BiCMOS processing is used to take advantage of low-voltage and
low-power requirements, component matching, very low input-offset errors,
and small component geometries.
Range 'E' devices are rated for operation over a tem per a ture range of
-40°C to +85°C; range 'L' devices are rated for operation over a tem per a ture
range of -40°C to +150°C. Two package styles provide a mag net i cal ly op ti -
mized pack age for most ap pli ca tions. ‘LH’ is a min ia ture low-profile surface-
mount package, ‘UA’ is a three-lead SIP for through-hole mounting. Each
package is available in a lead (Pb) free version (suffix, –T) , with a 100% matte
tin plated leadframe.
FEATURES
■ Micropower Operation
■ Operate With North or South Pole
■ 2.4 V to 5.5 V Battery Operation
■ Chopper Stabilized
Superior Temperature Stability
Extremely Low Switch-Point Drift
Insensitive to Physical Stress
■ ESD Protected to 5 kV
■ Sol id-State Reliability
■ Small Size
■ Easily Manufacturable With Magnet Pole Independence
Data Sheet
27622.62F
Package Designator ‘LH’ Pinning
(SOT23W)
3213 AND
3214
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25°C
Supply Voltage, V
DD
.............................. 6 V
Magnetic Flux Density, B .......... Unlimited
Output Off Voltage, V
OUT
...................... 6 V
Output Current, I
OUT
........................... 1 mA
Junction Temperature, T
J
................ +170°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
Caution: These CMOS devices have input
static protection (Class 3) but are still sus-
ceptible to damage if exposed to extremely
high static electrical charges.
Pinning is shown viewed from branded side.
MICROPOWER, ULTRA-SENSITIVE
HALL-EF FECT SWITCHES
Dwg. PH-016-1
V
DD
12
3
SUPPL
Y
OUTPUT
GROUND