A3425ELTR-T Allegro Microsystems Inc, A3425ELTR-T Datasheet

IC SW HALL EFFECT BIPO 8-SOIC

A3425ELTR-T

Manufacturer Part Number
A3425ELTR-T
Description
IC SW HALL EFFECT BIPO 8-SOIC
Manufacturer
Allegro Microsystems Inc
Type
Bipolar Latchr
Datasheets

Specifications of A3425ELTR-T

Sensing Range
35G Trip, -35G Release
Voltage - Supply
3.3 V ~ 18 V
Current - Supply
6mA
Current - Output (max)
20mA
Output Type
Digital, Open Drain
Features
Ultra Sensitive
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (0.154", 3.90mm Width)
Magnetic Type
Bipolar
Operating Supply Voltage (min)
3.3V
Operating Supply Voltage (typ)
5/9/12/15V
Operating Supply Voltage (max)
18V
Mag Sensor Operate Point (g)
35Gs
Mag Sensor Release Point (g)
-35Gs
Mag Sensor Hysteresis(g)
16Gs
Package Type
SOIC
Pin Count
8
Mounting
Surface Mount
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A3425ELTR-T
Manufacturer:
ALLEGRO/雅丽高
Quantity:
20 000
Features and Benefits
▪ Two matched Hall effect switches on a single substrate
▪ Hall element spacing approximately 1 mm
▪ Superior temperature stability
▪ 3.3 to 18 V operation
▪ Integrated ESD diode from OUTPUT and VCC pins
▪ High-sensitivity switchpoints
▪ Robust structure for EMC protection
▪ Solid-state reliability
Package: 8 pin SOIC (suffix L), and 4 pin
SIP (suffix K)
Not to scale
A3425DS-Rev. 12
to GND
V
Supply
Ultra-Sensitive Dual-Channel Quadrature
Typical Application
Using unregulated supply
100 Ω
Description
The A3425 is a dual–output-channel, bipolar switch with each
channel comprising a separate complete Hall-effect circuit with
dedicated Hall element and separate digital output for speed
and direction signal processing capability. The independent
Hall elements (E1 integrated with
with
than 1 μm. Maintaining this accurate mechanical location
between the two active Hall elements eliminates the major
manufacturing hurdle encountered in fine-pitch detection
applications. The A3425 is a highly sensitive, temperature-stable
magnetic device, which is ideal for use in ring magnet-based
speed and direction sensing systems used in harsh automotive
and industrial environments.
The A3425 contains two independent Hall effect switches, and
has a monolithic IC that accurately locates the two Hall elements,
E1 and E2, approximately 1 mm apart. The digital outputs are
90º out of phase so that the outputs are in quadrature, with the
proper ring magnet design. This allows for easy processing of
speed and direction signals. Extremely low-drift amplifiers
guarantee symmetry between the switches to maintain signal
Continued on the next page…
OUTPUTB
Hall-Effect Bipolar Switch
0.1 uF
1
VCC
) are photolithographically aligned to better
A3425
OUTPUTA
GND
2
4
OUTPUTB
3
OUTPUTA
V
V
OUTPUTB
OUTPUTA
, and E2 integrated
A3425

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A3425ELTR-T Summary of contents

Page 1

Features and Benefits ▪ Two matched Hall effect switches on a single substrate ▪ Hall element spacing approximately 1 mm ▪ Superior temperature stability ▪ 3 operation ▪ Integrated ESD diode from OUTPUT and VCC pins to ...

Page 2

... An on-chip regulator allows the use of this device over a wide operating voltage range. Post-assembly factory programming provides sensitive switchpoints Selection Guide Part Number Packing A3425EK-T Bulk, 500 pieces/bag A3425ELTR-T 2 13-in. reel, 3000 pieces/reel A3425LK-T Bulk, 98 pieces/bag A3425LLTR-T 13-in. reel, 3000 pieces/reel 1 Contact Allegro for additional packing options ...

Page 3

A3425 VCC Channel A Hall Element E1 Channel B Hall Element E2 Package K Package Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch Functional Block ...

Page 4

A3425 OPERATING CHARACTERISTICS and T = 25º Characteristic ELECTRICAL CHARACTERISTICS 1 Supply Voltage Output Leakage Current Output Rise Time Output Fall Time Supply Current Low Output Voltage Output Sink Current Output Sink Current, Continuous ...

Page 5

A3425 OPERATING CHARACTERISTICS (continued) data applies and T = 25º Characteristic MAGNETIC CHARACTERISTICS, K Package Operate Point: B > Release Point: B < Hysteresis: B – OP(A) ...

Page 6

A3425 THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information Characteristic Package Thermal Resistance *Additional thermal data available on the Allegro Web site. Ultra-Sensitive Dual-Channel Quadrature Symbol Package K, 1-layer PCB with copper limited to solder pads R ...

Page 7

A3425 Chopper-Stabilized Technique When using Hall effect technology, a limiting factor for switchpoint accuracy is the small signal voltage developed across the Hall element. This voltage is dis- proportionally small relative to the offset that can be produced at the ...

Page 8

A3425 Channel A M agnetic Field at Hall Element E1 Channel B M agnetic Field at Hall Element E2 Channel A Output Signal at OUTPUTA Channel B Output Signal at OUTPUTB Ultra-Sensitive Dual-Channel Quadrature Typical Applications Operation V+ B HYS ...

Page 9

A3425 This device requires minimal protection circuitry during operation with a low-voltage regulated line. The on-chip voltage regulator provides immunity to power supply variations between 3.3 and 18 V. Because the device has open-drain outputs, pull-up resistors must be included. ...

Page 10

A3425 The device must be operated below the maximum junction temperature of the device Under certain combinations of J(max) peak conditions, reliable operation may require derating sup- plied power or improving the heat dissipation properties of the application. ...

Page 11

A3425 Electrical Operating Characteristics, Package L I CC(off ( CC(on (V) CC ...

Page 12

A3425 Magnetic Operating Characteristics, Package L Channel A, B and -10 -20 - (V) CC Channel B, B and ...

Page 13

A3425 Magnetic Operating Characteristics, Package L (continued) B Symmetry -10 - Symmetry -10 -20 - (V) CC Additional ...

Page 14

A3425 Magnetic Operating Characteristics, Package L (continued) Channel A Symmetry -10 -20 - (V) CC Channel B Symmetry -10 -20 - (V) CC Ultra-Sensitive ...

Page 15

A3425 Electrical Operating Characteristics, Package K I CC(off ( CC(on (V) CC ...

Page 16

A3425 Magnetic Operating Characteristics, Package K Channel A, B and -10 -20 - (V) CC Channel B, B and ...

Page 17

A3425 Magnetic Operating Characteristics, Package K (continued) B Symmetry -10 - Symmetry -10 -20 - (V) CC Additional ...

Page 18

A3425 Magnetic Operating Characteristics, Package K (continued) Channel A Symmetry -10 -20 - (V) CC Channel B Symmetry -10 -20 - (V) CC Ultra-Sensitive ...

Page 19

A3425 45° +0.08 3.43 –0.05 E1 2.16 MAX 0.51 REF 1 14.73 ±0.51 +0.07 0.41 –0.05 Ultra-Sensitive Dual-Channel Quadrature Package K, 4-pin SIP +0.08 5.21 –0. 2.10 1.00 1.55 ±0.05 1. 45° Branded Face ...

Page 20

A3425 4.90 ±0. 0.10 C 0.41 ±0.10 1.27 BSC For Reference Only; not for tooling use (reference DWG-9204) Dimensions in millimeters Dimensions exclusive of mold flash, gate burrs, and dambar protrusions Exact ...

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