A3425LLTR-T

A3425LLTR-T Datasheet


A3425

Part Datasheet
A3425LLTR-T A3425LLTR-T A3425LLTR-T (pdf)
Related Parts Information
A3425EL-T A3425EL-T A3425EL-T
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A3425LK-T A3425LK-T A3425LK-T
A3425LL A3425LL A3425LL
A3425LL-T A3425LL-T A3425LL-T
A3425EK-T A3425EK-T A3425EK-T
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A3425

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch

Two matched Hall effect switches on a single substrate Hall element spacing approximately 1 mm Superior temperature stability to 18 V operation Integrated ESD diode from OUTPUT and VCC pins
to GND High-sensitivity switchpoints Robust structure for EMC protection Solid-state reliability

Package 8 pin SOIC suffix L , and 4 pin SIP suffix K

The A3425 is a 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 OUTPUTA, and E2 integrated with OUTPUTB are photolithographically aligned to better than 1 um. Maintaining this accurate mechanical location between the two active Hall elements eliminates the major manufacturing hurdle encountered in fine-pitch detection applications.TheA3425 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

Not to scale

Continued on the next

VSupply
100 Ω

OUTPUTA

A3425

OUTPUTB

VOUTPUTB VOUTPUTA

A3425DS-Rev. 11

Using unregulated supply

A3425

Ultra-Sensitive Dual-Channel Quadrature Hall-Effect Bipolar Switch

Description continued quadrature. The patented chopper stabilization technique cancels offsets in each channel, and provides stable operation over the operating temperature and voltage ranges. An on-chip regulator allows the use of this device over a wide operating voltage range. Post-assembly factory programming provides sensitive switchpoints
that are symmetrical between the two switches.

The A3425 is available in a plastic 8-pin SOIC surface mount package L and a plastic 4-pin SIP K , both in two operating temperature ranges. Each package is available in a lead Pb free version with 100% matte tin plated leadframe.

Selection Guide

Part Number A3425EK-T A3425ELTR-T2

Packing1 Bulk, 500 pieces/bag 13-in. reel, 3000 pieces/reel

Mounting 4-pin SIP through hole 8-pin SOIC surface mount

Ambient, TA to 85ºC

A3425LK-T A3425LLTR-T

Bulk, 98 pieces/bag 13-in. reel, 3000 pieces/reel
4-pin SIP through hole 8-pin SOIC surface mount
to 150ºC
1Contact Allegro for additional packing options. 2Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change May 4,

Absolute Maximum Ratings

Operating Ambient Temperature

Maximum Junction Temperature Storage Temperature

Symbol VCC VRCC

VOUTPUT IOUTPUT Sink

TJ max Tstg

Range E Range L

Notes

Rating VCC
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Datasheet ID: A3425LLTR-T 516019