Diodes AH49H User Manual

LINEAR HALL EFFECT IC AH49H

Data Sheet

General Description

The AH49H is a small, versatile linear Hall-effect
device that is operated by the magnetic field from a
permanent magnet or an electromagnet. The output
voltage is set by the supply voltage and varies in
proportion to the strength of the magnetic field.

The integrated circuitry features low noise output,
which makes it unnecessary to use external filtering
components. It also includes precision resistors to
provide increased temperature stability and accuracy.
The operating temperature range of these linear Hall
sensors is -40°C to 105°C, appropriate for
commercial, consumer, and industrial environments.

The AH49H is available in standard TO-92S-3 and
SOT-23-3 packages.

Features

• Miniature Construction

• Power Consumption of 2mA at V
Energy Efficiency

• Single Current Sourcing Output

• Linear Output for Circuit Design Flexibility

• Low Noise Output Virtually Eliminates the Need

• for Filtering

• A Stable and Accurate Output

• Temperature Range: -40°C to 105°C

• Responds to Either Positive or Negative Gauss

• The Maximum Instantaneous Supply Voltage

• Up to 50V

• High ESD Rating: 6000V (Human Body Model)

400V (Machine Model)

=3.3V for

CC

Application

• Current Sensing

• Motor Control

• Position Sensing

• Magnetic Code Reading

• Rotary Encoder

• Ferrous Metal Detector

• Vibration Sensing

• Liquid Level Sensing

• Weight Sensing

TO-92S-3 SOT-23-3

Figure 1. Package Types of AH49H

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

Data Sheet

LINEAR HALL EFFECT IC AH49H

Pin Configuration

Z3 Package N Package
(TO-92S-3) (SOT-23-3)

3

2

1

(Front View) (Top View)

Figure 2. Pin Configuration of AH49H

OUT
GND
VCC

GND

3

21

VCC OUT

Pin Description

Pin Number

TO-92S-3 SOT-23-3

1 1 VCC Power supply pin
2 3 GND Ground pin
3 2 OUT Output pin

Pin Name Function

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

Data Sheet

LINEAR HALL EFFECT IC AH49H

Functional Block Diagram

Figure 3. Functional Block Diagram of AH49H

Ordering Information

AH49H -

Circuit Type

Package
Z3: TO-92S-3
N: SOT-23-3

G1: Green

Blank: Bulk
TR: T ape & Reel

Package

TO-92S-3

SOT-23-3 AH49HNTR-G1 GT7 Tape & Reel

BCD Semiconductor's Pb-free products, as designated with "G1" in the part number, are RoHS compliant and
green.

Temperature

Range

-40 to 105°C

Part Number Marking ID Packing Type

AH49HZ3-G1 49HG Bulk

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

Data Sheet

LINEAR HALL EFFECT IC AH49H

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Supply Voltage VCC
Instantaneous Supply Voltage V

TO-92S-3

Power Dissipation

SOT-23-3 230
Ambient Temperature TA -40 to 125
Storage Temperature T
ESD (Human Body Model) 6000 V
ESD (Machine Mode) 400 V

50 V

CC_INST

PD

-50 to 150

STG

10

400

V

mW

°C
°C

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions (T

=25°C)

A

Parameter Symbol Min Max Unit

Supply Voltage VCC 3 8 V
Operating T emperat ure TOP -40 105

°C

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

Data Sheet

LINEAR HALL EFFECT IC AH49H

Electrical Characteristics

VCC=3.3V, TA=25°C, unless otherwise specified.

Parameter Symbol Conditions Min Typ Max Unit

Supply Current ICC 1.2 2 3.2 mA
Quiescent Output
Voltage
Output Voltage
Sensitivity
Output Voltage Span V
Output Resistor R
Linear Magnetic Range B ±3000 Gauss

Output Noise

B=0 (Gauss) 1.45 1.7 1.85 V

V

NULL

B=±600 (Gauss) 0.33 mV/Gauss

V

SEN

0.85 to 2.6 V

OUT S

30 50 70

OUT

Bandwidth=10Hz
to 10kHz

90

Ω

μV

Transferring Characteristics (VCC=3.3V)

When there is no outside magnetic field (B=0Gauss),
the quiescent output voltage is one-half the supply
voltage in general.

For TO-92S-3 package, if a south magnetic pole
approaches the front face (the side with marking ID)
of the Hall effect sensor, the circuit will drive the
output voltage higher. In contrary, a north magnetic
pole will drive the output voltage lower. The
variations of voltage level up or down are
symmetrical. Because the SOT-23-3 is reversed
packaging with TO-92S-3, so the magnetic
performance is also reversed. Therefore, if the
reversed magnetic pole approaches the front face, the
output is the same as TO-92S-3 package. Greatest
magnetic sensitivity is obtained with a supply voltage
of 8V, but at the cost of increased supply current and
a slight loss of output symmetry. So, it is not

South Pole

recommended to work in such condition unless the
output voltage magnitude is a main issue. The output
signal can be capacitively coupled to a next-level
amplifier for further amplifying if the changing
frequency of the magnetic field is high.

Figure 4. Transferring Characteristic of AH49H

North Pole

For TO-92S-3 For SOT-23-3

Figure 5. Magnetic Characteristic of AH49H

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

Data Sheet

LINEAR HALL EFFECT IC AH49H

Typical Performance Characteristics

5.0

4.5

4.0

3.5

3.0

2.5

(V)

CC

I

2.0

1.5

1.0

0.5

0.0
2345678

VCC (V)

B=0Gauss
No Load

2.8

2.4

2.0

(V)

1.6

OUT

V

1.2

0.8

-4000 -2000 0 2000 4000

VCC=3.3V
No Load

B (Gauss)

Figure 6. Supply Current vs. Supply Voltage Figure 7. Output Voltage vs. Magnetic Field

5

3

4

3

(V)

OUT

2

V

1

0

2345678

VCC (V)

B=0Gauss
No Load

2

(V)

OUT

V

1

VCC=3.3V
B=0Gauss

No Load

0

-40 0 40 80 120

TA (oC)

Figure 8. Output Voltage vs. Supply Voltage Figure 9. Output Voltage vs. Ambient Temperature

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

Data Sheet

LINEAR HALL EFFECT IC AH49H

Typical Performance Characteristics (Continued)

450

400

350

300

250

200

(mW)

D

P

150

100

50

0

0 25 50 75 100 125 150

Figure 10. Power Dissipation vs. Ambient Temperature

TA (OC)

SOT-23-3
TO-92S-3

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

Data Sheet

LINEAR HALL EFFECT IC AH49H

Mechanical Dimensions

TO-92S-3 Unit: mm(inch)

°
°

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

Data Sheet

LINEAR HALL EFFECT IC AH49H

Mechanical Dimensions (Continued)

SOT-23-3 Unit: mm(inch)

0.300(0.012)

0.600(0.024)

1.500(0.059)

1.700(0.067)

2.650(0.104)

3.000(0.118)

°

°

MAX.

1.450(0.057)

Jun. 2013 Rev. 1.2 BCD Semiconductor Manufacturing Limited

BCD Semiconductor Manufacturing Limited

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