A3122U

3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION These Hall-effect switches are monolithic integrated circuits with tighter magnetic specifications, designed to operate continuously over extended temperatures to +150°C, and are more stable with both temperature and supply voltage changes. The unipolar switching characteristic makes these devices ideal for use with a simple bar or rod magnet. The three basic devices (3121, 3122, and 3123) are identical except for magnetic switch points. Each device includes a voltage regulator for operation with supply voltages of 4.5 voltas to 24 volts, reverse battery protection diode, quadratic Hall-voltage generator, temperature compensation circuitry, small-signal amplifier, Schmitt trigger, and an open-collector output to sink up to 25 mA. With suitable output pull up, they can be used with bipolar or CMOS logic circuits. The 3121 is an improved replacement for the 3113 and 3119. The first character of the part number suffix determines the device operating temperature range. Suffix ‘E–’ is for the automotive and industrial temperature range of -40°C to +85°C. Suffix ‘L–’ is for the automotive and military temperature range of -40°C to +150°C. Three package styles provide a magnetically optimized package for most applications. Suffix ‘–LT’ is a miniature SOT-89/TO-243AA transistor package for surface-mount applications; suffix ‘–U’ is a three-lead plastic mini-SIP while suffix ‘–UA’ is a three-lead ultra-mini-SIP. Data Sheet 27621.4B V X CC 1 2 3 GROUND Dwg. PH-003A Pinning is shown viewed from branded side. ABSOLUTE MAXIMUM RATINGS OUTPUT SUPPLY at TA = +25°C FEATURES and BENEFITS I Superior Temp. Stability for Automotive or Industrial Applications I 4.5 V to 24 V Operation … Needs Only An Unregulated Supply I Open-Collector 25 mA Output … Compatible with Digital Logic I Reverse Battery Protection I Activate with Small, Commercially Available Permanent Magnets I Solid-State Reliability … No Moving Parts I Small Size I Resistant to Physical Stress Supply Voltage, VCC ........................... 30 V Reverse Battery Voltage, VRCC ........ -30 V Magnetic Flux Density, B ....... Unlimited Output OFF Voltage, VOUT ................ 28 V Reverse Output Voltage, VOUT ........ -0.5 V Continuous Output Current, IOUT ... 25 mA Operating Temperature Range, TA Suffix ‘E–’ ................. -40°C to +85°C Suffix ‘L–’ ............... -40°C to +150°C Storage Temperature Range, TS .............................. -65°C to +170°C Always order by complete part number, e.g., A3121EU . 3121, 3122, AND 3123 HALL-EFFECT SWITCHES FOR HIGH-TEMPERATURE OPERATION ELECTRICAL CHARACTERISTICS over operating temperature range, at VCC = 12 V. Limits Characteristic Supply Voltage Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Fall Time Symbol VCC VOUT(SAT) IOFF ICC tr tf Test Conditions Operating IOUT = 20 mA, B > BOP VOUT = 24 V, B < BRP B < BRP (Output OFF) RL = 820 Ω, CL = 20 pF RL = 820 Ω, CL = 20 pF Min. 4.5 — — — — — Typ. — 140