a3515

Ratiometric, Linear Hall-Effect Sensorsfor High-Temperature Operation

Not for New Design

These parts are in production but have been determined to be

NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available.

Date of status change: May 2, 2005

Recommended Substitutions:

For new customers or new applications:

• for the A3515, please refer to the Allegro A1321, and• for the A3516, please refer to the Allegro A1323.

NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative.

Allegro MicroSystems, Inc. reserves the right to make, from time to time, revisions to the anticipated product life cycle plan for a product to accommodate changes in production capabilities, alternative product availabilities, or market demand. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use.

3515 AND3516RATIOMETRIC, LINEAR HALL-EFFECT SENSORS

FOR HIGH-TEMPERATURE OPERATION

The A3515– and A3516– are sensitive, temperature-stable linear Hall-effect sensors with greatly improved offset characteristics. Ratiometric, linearHall-effect sensors provide a voltage output that is proportional to the appliedmagnetic field and have a quiescent output voltage that is approximately 50%of the supply voltage. These magnetic sensors are ideal for use in linear androtary position sensing systems in the harsh environments of automotive andindustrial applications over extended temperatures to -40°C and +150°C. TheA3515– features an output sensitivity of 5 mV/G, while the A3516– has anoutput sensitivity of 2.5 mV/G. See the Magnetic Characteristics table forcomplete, individual device parametrics.

Each BiCMOS monolithic circuit integrates a Hall element, improvedtemperature-compensating circuitry to reduce the intrinsic sensitivity drift ofthe Hall element, a small-signal high-gain amplifier, and a rail-to-rail low-impedance output stage.

A proprietary dynamic offset cancelation technique, with an internalhigh-frequency clock, reduces the residual offset voltage, which is normallycaused by device overmolding, temperature dependancies, and thermal stress.This technique produces devices that have an extremely stable quiescentoutput voltage, are immune to mechanical stress, and have precise recover-ability after temperature cycling. Many problems normally associated withlow-level analog signals are minimized by having the Hall element andamplifier in a single chip. Output precision is obtained by internal gain andoffset trim adjustments during the manufacturing process.

These devices are supplied in a 3-pin ultra-mini-SIP ‘UA’ package.

Data Sheet27501.10CVCC1X23GROUNDDwg. PH-006Pinning is shown viewed from branded side.OUTPUTSUPPLYABSOLUTE MAXIMUM RATINGSSupply Voltage, VCC.............................. 8.0 VOutput Voltage, VO................................ 8.0 VOutput Sink Current, IO....................... 10 mAMagnetic Flux Density, B.............. UnlimitedPackage Power Dissipation,PD........................................... See GraphOperating Temperature Range*, TASuffix ‘E–’..................... -40°C to +85°CSuffix ‘L–’....................-40°C to +150°CStorage Temperature Range,TS.................................. -65°C to +170°C* Infrequent excursions permitted; seeApplications Information.FEATURES

s Temperature-Stable Quiescent Output Voltages Precise Recoverability After Temperature Cyclings Output Voltage Proportional to Applied Magnetic Fields Ratiometric Rail-to-Rail Outputs Improved Sensitivitys 4.5 V to 5.5 V Operations Immune to Mechanical Stresss Small Package Sizes Solid-State Reliability

Always order by complete part number, e.g., A3515LUA .3515 AND 3516RATIOMETRIC,LINEAR

HALL-EFFECT SENSORS

FUNCTIONAL BLOCK DIAGRAM

1SUPPLYVccDYNAMICOFFSET CANCELLATIONLOW-PASSFILTER800ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS700Suffix \"–UA\" RθJA = 165°C/W600Suffix \"–U\" RθJA = 184°C/W500400300200Suffix \"E–\"100Suffix \"L–\"020406010080120AMBIENT TEMPERATURE in °C140160180 Dwg. GH-046A2

+–X–+3OUTPUT2GROUNDVcc/2Dwg. FH-016Aθ°115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000Copyright © 1996, 2003 Allegro MicroSystems, Inc.

3515 AND 3516RATIOMETRIC,

LINEAR

HALL-EFFECT SENSORS

ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 5 V (unlessotherwise noted).

Limits

CharacteristicSupply VoltageSupply CurrentQuiescent

Voltage OutputOutput Voltage

SymbolVCCICCVOQVOHVOL

Output

Source Current LimitBandwidth (-3 dB)Clock FrequencyOutput ResistanceWide-Band

Output Noise (rms)

IOLMBWfCrOeo

IO ≤ -2 mA

B = 0, BW = 10 Hz to 10 kHz,IO ≤ -1 mA, CO = 100 pFTest ConditionsOperating

B = 0, VCC = 6 V, IO = 0B = 0, IO = 1 mA, TA = 25°CB = +X*, IO = 1 mAB = -X*, IO = -1 mAB = -X*, VO = 0

Min.4.5–2.425

Typ.5.07.22.500

Max.5.5102.575

UnitsVmAV

––-1.0

4.7–0.2-1.5

––

VVmA

––––

301701.0400

––––

kHzkHzΩµV

NOTE 1 – Typical data is at TA = 25°C and is for design information only.NOTE 2 – Negative current is defined as coming out of (sourcing) the output.

* This test requires positive and negative fields sufficient to swing the output driver between fully OFF and saturated (ON), respec-tively. It is NOT intended to indicate a range of linear operation.

www.allegromicro.com3

3515 AND 3516RATIOMETRIC,LINEAR

HALL-EFFECT SENSORS

MAGNETIC CHARACTERISTICS over operating temperature range, at VCC = 5 V, IO = -1 mA(unless otherwise noted).

Part Numbers

A3515EUA

Characteristic*

A3515LUAMin.Typ.Max.-40

–

+150

A3516EUAMin.Typ.Max.-40

–

+85

A3516LUAMin.Typ.Max.-40

–

+150

Units°CmV/G%%G%%%%%

Min.Typ.Max.-40

–

+85

Operating Temp. Range, TA Sensitivity at TA = 25°C ∆Sens(∆T) at TA = Max. ∆Sens(∆T) at TA = Min. ∆VOQ(∆T)†

Ratiometry, ∆VOQ(∆V) Ratiometry, ∆Sens(∆V) Positive Linearity, Lin+ Negative Linearity, Lin– Symmetry4.505.005.50-2.5

2.5

7.51.0±10–––––

4.505.005.50-2.5

2.5

7.51.0±10–––––

2.252.502.75-2.5

2.5

7.51.0±10–––––

2.252.502.75-2.5

2.5

7.51.0±10–––––

-9.0-1.3––––––

–100100100100100

-9.0-1.3––––––

–100100100100100

-9.0-1.3––––––

–100100100100100

-9.0-1.3––––––

–100100100100100

NOTE 1 – Magnetic flux density is measured at most sensitive area of device located 0.0195\" (0.50 mm) below the branded face ofthe “UA” package.

NOTE 2 – 10 G = 1 mT, exactly.

NOTE 3 – Except for ∆Sens(∆T), typical data is at TA = 25°C and is for design information only.* See Characteristics Definitions for test conditions.

† This calculation (formula 1, next page) yields the device’s equivalent accuracy, over the operating temperature range, in gauss.

4

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

3515 AND 3516RATIOMETRIC,

LINEAR

HALL-EFFECT SENSORS

CHARACTERISTICS DEFINITIONS

Quiescent Voltage Output. In the quiescent state (no mag-netic field), the output is ideally equal to one-half of the supplyvoltage over the operating voltage and temperature range (VOQ∪ VCC/2). Due to internal component tolerances and thermalconsiderations, there is a tolerance on the quiescent voltageoutput and on the quiescent voltage output as a function ofsupply voltage and ambient temperature. For purposes ofspecification, the quiescent voltage output as a function oftemperature is defined as

VOQ(TA) – VOQ(25°C)

Sens(25°C)

Ratiometry. The A3515xUA and A3516xUA feature a

ratiometric output. The quiescent voltage output and sensitivityare proportional to the supply voltage (ratiometric).

The per cent ratiometric change in the quiescent voltageoutput is defined as

VOQ(VCC) / VOQ(5V) VCC / 5 V

∆VOQ(∆V) = x 100%(4)

∆VOQ(∆T) =

(1)

and the per cent ratiometric change in sensitivity is defined as

Sens(VCC) / Sens(5V)

∆Sens(∆V) =x 100% VCC / 5 V

This calculation yields the device’s equivalent accuracy,over the operating temperature range, in gauss.

Sensitivity. The presence of a south-pole magnetic fieldperpendicular to the package face (the branded surface) willincrease the output voltage from its quiescent value toward thesupply voltage rail by an amount proportional to the magneticfield applied. Conversely, the application of a north pole willdecrease the output voltage from its quiescent value. Thisproportionality is specified as the sensitivity of the device andis defined as

VO(500G) – VO(-500G)

1000 G

(5)

Linearity and Symmetry. The on-chip output stage is de-signed to provide a linear output to within 500 mV of either railwith a supply voltage of 5 V. This is equivalent to approxi-mately ±800 gauss of ambient field. Although application ofstronger magnetic fields will not damage these devices, it willforce the output into a non-linear region. Linearity in per centis measured and defined as

VO(500G) – VOQ 2 (VO(250G) – VOQ)

Lin+ =

(2)

Lin– =

x 100%(6)

Sens =

The stability of sensitivity as a function of temperature isdefined as

Sens(TA) – Sens(25°C)

∆Sens(∆T) = x 100% Sens(25°C)

VO(-500G) – VOQ 2 (VO(-250G) – VOQ)

x 100%(7)

and output symmetry as

(3)

VO(500G) – VOQ Sym =x 100%

VOQ – VO(-500G)

(8)

www.allegromicro.com5

3515 AND 3516RATIOMETRIC,LINEAR

HALL-EFFECT SENSORS

TYPICAL CHARACTERISTICS

9.01.4Vcc = 5.5 V1.2Vcc = 5 VSUPPLY CURRENT IN mA8.0OUTPUT RESISTANCE IN ΩIO =1.0 -1 mAIO = 1 mAA0 mA7.0IO =0.8 5 mIO = 10.66.0-50-2502550751001251500.4 -50-250255075100125150AMBIENT TEMPERATURE IN °CDwg. GH-039-2AMBIENT TEMPERATURE IN °CDwg. GH-060-12.552.546.0A3515–5.0QUIESCENT OUTPUT VOLTAGE IN VOLTS2.532.522.512.502.492.482.472.462.45-50Vcc = 5 VIo = -1 mAA3515–A3516–SENSITIVITY IN mV/G4.03.0A3516–2.0Vcc = 5 VIo = -1 mA1.0 -2502550751001251500 -50-250255075100125150AMBIENT TEMPERATURE IN °CDwg. GH-067AMBIENT TEMPERATURE IN °CDwg. GH-0666

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

3515 AND 3516RATIOMETRIC,

LINEAR

HALL-EFFECT SENSORS

APPLICATIONS INFORMATION

Calibrated linear Hall devices, which can be used to deter-mine the actual flux density presented to the sensor in a particu-lar application, are available.

For safe, reliable operation, the output should not be pulledabove the supply voltage or pulled below the device ground.For optimum performance, a 0.1 µF capacitor between thesupply and ground, and a 100 pF capacitor between the outputand ground, should be added.

The ratiometric feature is especially valuable when thesedevices are used with an analog-to-digital converter. A/D

converters typically derive their LSB step size by ratioing off areference voltage line. If the reference voltage varies, the LSBwill vary proportionally. This is a major error source in manysensing systems. The A3515xUA and A3516xUA can eliminatethis source of error by their ratiometric operation. Because theirgain and offsets are proportional to the supply voltage, if they arepowered from the A/D reference voltage, the sensor outputvoltage will track changes in the LSB value.

These devices can withstand infrequent temperature excur-sions, beyond the Absolute Maximum Ratings, to

TA = 170°C provided the junction temperature, TJ, does notexceed 200°C.

Extensive applications information on Hall-effect sensorsand magnets is also available in the “Hall-Effect IC ApplicationsGuide”, which can be found in the latest issue of the AllegroMicroSystems Electronic Data Book, AMS-702 or ApplicationNote 27701, or at

ACTIVE AREA DEPTH0.0195\"0.50 mmNOMSENSOR LOCATION

SUFFIX “UA”

0.081\"2.06 mm0.056\"1.42 mmABRANDEDSURFACE123Dwg. MH-011-7AAllegrowww.allegromicro.com

TYPICAL CURRENT-SENSING APPLICATION

B ≈ N x 6.9 G/ADwg. AH-005Awww.allegromicro.com7

3515 AND 3516RATIOMETRIC,LINEAR

HALL-EFFECT SENSORS

TYPICAL POSITION-SENSING APPLICATIONS

(Alnico 8, dimensions in inches)

+DVCC+0.21VCCSENSOR DEPTH BELOW PACKAGE FACEN SS NN SRELATIVE MAGNETIC FLUX DENSITYRELATIVE MAGNETIC FLUX DENSITYRELATIVE OUTPUT VOLTAGED0VOQ0.19S NN SD000.10.20.30.4RELATIVE DISTANCE (TOTAL EFFECTIVE AIR GAP)VOQ0.5Dwg. GH-047--0.10-0.08-0.06-0.0400.04RELATIVE DISTANCE0.060.08GND0.10Dwg. GH-049+0.19N SVCC+EFFECTIVEAIR GAPVCCEFFECTIVE AIR GAP = 0.050N SD0.21RELATIVE MAGNETIC FLUX DENSITYRELATIVE OUTPUT VOLTAGEEFFECTIVE AIR GAP = 0.0750VOQEFFECTIVE AIR GAP = 0.095-GND-0.20RELATIVE DISTANCE0.20.4Dwg. GH-048000.050.100.15RELATIVE DISTANCE0.20-0.4VOQ0.25Dwg. GH-0508

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

RELATIVE OUTPUT VOLTAGEDRELATIVE MAGNETIC FLUX DENSITYRELATIVE OUTPUT VOLTAGEN SS N3515 AND 3516RATIOMETRIC,

LINEAR

HALL-EFFECT SENSORS

A3515xUA and A3516xUA

Dimensions in Inches(controlling dimensions)

0.1640.159Dimensions in Millimeters

(for reference only)

4.174.0445°0.0620.05845°1.571.470.1220.11745°0.085MAX3.102.9745°2.16MAX1230.0311230.790.6400.6000.01730.013816.2615.240.440.35SEE NOTE0.01890.0142SEE NOTE0.480.360.050BSCDwg. MH-014E in1.27BSCDwg. MH-014E mmNOTES:1.Tolerances on package height and width representallowable mold offsets. Dimensions given aremeasured at the widest point (parting line).2.Exact body and lead configuration at vendor’s optionwithin limits shown.3.Height does not include mold gate flash.4.Recommended minimum PWB hole diameter to cleartransition area is 0.035\" (0.89 mm).5.Where no tolerance is specified, dimension is nominal.6.Supplied in bulk pack (500 pieces per bag).Radial Lead Form (order A351xxUA-LC)

1230.620\"0.500\"(15.7 mm12.7 mm)0.108\"(2.74 mm)0.100\"(2.5 mm)Dwg. MH-026NOTE:Lead-form dimensions are the nominals produced on theforming equipment. No dimensional tolerance is implied orguaranteed for bulk packaging (500 pieces per bag).www.allegromicro.com9

3515 AND 3516RATIOMETRIC,LINEAR

HALL-EFFECT SENSORS

Surface-Mount Lead Form (order A351xxUA-TL)

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

0.095±0.0052.41±0.130.002MAX0.051MAX0.004MAX0°–8°0.020MINFLAT0.10MAX0°–8°0.51MINFLAT0.050BSC1.27BSC0.0621.570.0380.97NOTE:Supplied in bulk pack (500 devices per bag).

The products described herein are manufactured under one or moreof the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patentspending.

Allegro MicroSystems, Inc. reserves the right to make, from time totime, such departures from the detail specifications as may be requiredto permit improvements in the performance, reliability, or

manufacturability of its products. Before placing an order, the user iscautioned to verify that the information being relied upon is current.Allegro products are not authorized for use as critical componentsin life-support appliances, devices, or systems without express writtenapproval.

The information included herein is believed to be accurate and

reliable. However, Allegro MicroSystems, Inc. assumes no responsibil-ity for its use; nor for any infringements of patents or other rights ofthird parties that may result from its use.

10

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000