AH350 Linear Hall-Effect Sensors Features General Description - Extremely Sensitive - Flat Response to 23 KHz - Low-Noise Output - 4.5V to 6V Operation - SIP-3L and SOT23-3L Package The AH350 Hall-effect sensors accurately track extremely small changes in magnetic flux density—changes are generally too small to operate Hall-effect switches. As motion detectors, gear tooth sensors, and proximity detectors, they are magnetically driven mirrors of mechanical events. As sensitive monitors of electromagnets, they can effectively measure system’s performance with negligible system loading while providing isolation from contaminated and electrically noisy environments. Application - Gear tooth Sensor - Notch Sensor - Current Sensor Each Hall-effect integrated circuit includes a Hall sensing element, linear amplifier, and emitter-follower output stage. Having the Hall cell and amplifier on a single chip minimizes problems associated with handling tiny analog signals. The device is rated for continuous operation over the temperature range of -20°C to +85°C. Pin Assignment (Top View) Pin Configuration 3. OUTPUT Name 2. GND Description SUPPLY 1. SUPPLY Ground GND (SIP3 package) Input power OUTPUT Output stage 3. OUTPUT GND 2. 1. SUPPLY ( SOT23 package) Ordering Information AH350 X - X X X Wafer Body Blank or A~Z : if necessary to specify Lead Package L : Lead Free P: SIP-3L W: SOT23-3L Blank: Normal Packing Blank : Tube A : Taping This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev. 0.1 Jan 19, 2005 1/6 AH350 Linear Hall-Effect Sensors Block Diagram 1 VCC REG. X 3 OUTPUT 2 GND Absolute Maximum Ratings Parameter Symbol Rating Unit Vcc B Top Tstg 8 Unlimited -20~+85 -65~+150 V Gauss °C °C Supply voltage Magnetic flux density Operating temperature range Storage temperature range Electrical Characteristics (at Ta = 25°C, Vcc=5V) Characteristic Symbol Supply Voltage Supply Current Quiescent Output Voltage Sensitivity Bandwidth (-3 dB) Broadband Output Noise Output Resistance Vcc Icc Vout ∆Vout BW Vout Rout Conditions B=0G B=0G to ±900G BW=10Hz to 10kHz Min Typ Max Unit 4.5 － 2.35 1.4 － － － － 5 2.60 1.8 23 90 50 6.0 9 2.85 2.2 － － 220 V mA V mV/G kHz µV Ω All output-voltage measurements are made with a voltmeter having an input impedance of at least 10 kΩ. measured at most sensitive area of device located 1.15mm below from top side and 2.0mm from right side. Anachip Corp. www.anachip.com.tw Magnetic flux density is Rev 0.1 Jan 19, 2005 2/6 AH350 Linear Hall-Effect Sensors Typical Performance Characteristics Vcc=+5V 4.5 5 B=+500G B=0G B=-500G Sensitivity (mV/G) Output Voltage (V) Output Voltage as a Function of Temperature 3.5 2.5 1.5 Ta= +25deg. 4 sensitivity 3 2 1 0 -40 -20 0 25 o 85 125 4.5 Temperature ( C) Supply current as a Function of Supply Voltage 5.4 4 B=0G Ta=+25deg 5.2 Output Voltage(V) Supply current (mA) Device Sensitivity as a Function of Supply Voltage 5 4.8 Icc 4.6 4.4 3.5 3 5 5.5 Supply Voltage(V) 6 Output Null Voltage as a Function of Supply Voltage B= 0G Ta= +25deg. 2.5 2 1.5 1 0.5 Output voltage 0 4.2 4.5 4.7 4.9 5.1 5.3 5.5 5.7 4.5 5.9 Supply voltage(V) 5 5.5 6 Supply Voltage(V) Anachip Corp. www.anachip.com.tw Rev 0.1 Jan 19, 2005 3/6 AH350 Linear Hall-Effect Sensors Function Descriptions The output null voltage (B=0G) is nominally one-half the supply voltage. A south magnetic pole, presented to the branded face of the Hall-effect sensor will drive the output higher than the null voltage level. A north magnetic pole will drive the output below the null level. The south pole of a magnet is attached to the back of the package if the Hall-effect IC is to sense the presence of ferrous material. The north pole of a magnet is attached to the back surface if the integrated circuit is to sense the absence of ferrous material. In operation, instantaneous and proportional output-voltage levels are dependent on magnetic flux density at the most sensitive area of the device. Greatest sensitivity is obtained with a supply voltage of 6V, but at the cost of increased supply current and a slight loss of output symmetry. The sensor’s output is usually capacitively coupled to an amplifier that boosts the output above the millivolt level. Calibrated linear Hall devices, which can be used to determine the actual flux density presented to the sensor in a particular application, are available. In two applications shown, a permanent bias magnet is attached with epoxy glue to the back of the epoxy package. The presence of ferrous material at the face of the package acts as a flux concentrator. Marking Information (1) SIP3 (2) SOT23 (Top View) (Top View) 350 YWW X ID code A~Z: Non-Lead Free a~z : Lead Free XX YM X ID code A~Z: Non-Lead Free a~z: Lead Free PZ: AH350 Date code Y : Year M : Month (A~L) Date code Y : Year WW : Nth week Anachip Corp. www.anachip.com.tw Rev 0.1 Jan 19, 2005 4/6 AH350 Linear Hall-Effect Sensors Package Information (1) SIP-3 0.51mm NOM 2.00mm 1.15mm BRANDED SURFACE 1 Active Area Depth 2 3 Sensor Location 45º 0.38mm 0.7mm 1.57mm 1.47mm 0.41mm 0.41mm 3 1.27mm 4.17mm 4.04mm 2 1 45º 3.10mm 2.97mm 1.82 mm 15.50mm 13.00mm Package Dimension Anachip Corp. www.anachip.com.tw Rev 0.1 Jan 19, 2005 5/6 AH350 Linear Hall-Effect Sensors (2) SOT23-3L D 2 HE E M ( Sensing point ) 0.8mm 1 3 SEE VIEW C 1.45mm e1 e θ1(4x) 3X GAUGE PLANE A A2 0.10 C L SEATING PLANE A1 θ 2(4x) VIEW C b(3x) Symbol A A1 A2 b C D E HE L L1 M e e1 θ θ1 θ2 Dimensions In Millimeters Min. 1.05 0.05 1.00 0.25 0.08 2.70 1.50 2.60 0.30 0.50 0.73 1.80 0.85 0o 3o 6o Nom. 1.10 2.90 1.60 2.80 0.60 0.78 1.90 0.95 5o 5o 8o Max. 1.35 0.15 1.20 0.50 0.20 3.00 1.70 3.00 0.55 0.70 0.83 2.00 1.05 10o 7o 10o Anachip Corp. www.anachip.com.tw θ L1 Dimensions In Inches Min. 0.041 0.002 0.039 0.010 0.003 0.106 0.059 0.102 0.012 0.020 0.029 0.071 0.033 0o 3o 6o Nom. 0.043 0.114 0.063 0.110 0.024 0.031 0.075 0.037 5o 5o 8o Max. 0.053 0.006 0.047 0.020 0.008 0.118 0.067 0.118 0.022 0.028 0.033 0.079 0.041 10o 7o 10o Rev 0.1 Jan 19, 2005 6/6