Features: Continuous-time operation
Fast power-on time
Low noise
Stable operation over full operating temperature range
Reverse battery protection
Solid-state reliability
Factory-programmed at end-of-line for optimum performance
Robust EMC performance
High ESD rating
Regulator stability without a bypass capacitorSpecificationsSupply Voltage, VCC ..............................................30 V
Reverse-Supply Voltage, VRCC ...........................30 V
Output Off Voltage, VOUT.......................................30 V
Reverse-Output Voltage, VROUT ....................... 0.5 V
Output Current, IOUTSINK...................................25 mA
Magnetic Flux Density, B .................................Unlimited
Operating Temperature
Ambient, TA, Range E............................40ºC to 85ºC
Ambient, TA, Range L..........................40ºC to 150ºC
Maximum Junction, TJ(max)
........................165ºC
Storage Temperature, TS ..................65ºC to 170ºCDescriptionThe Allegro A1202 and A1203 Hall-effect bipolar switches are next-generation replacements and extension of the popular Allegro A3133 and A3132 bipolar switch product line. The A1203 is guaranteed to switch on with the presence of at least a 95G South pole field on the face of the IC and off with at least a -95G North pole field on the face of the IC. The A1202 offers 20G tighter switchpoints at both ends. Due to the fact these are hall-effect bipolar switches they may switch on and off with a North pole field or on and off with a South pole field. A1202 and A1203 require systems with alternating fields of sufficient strength (i. e. ring magnets) to show transitions and they are not recommended for applications with tight duty cycle requirements. Overall, the A120x family, produced with BiCMOS technology, consists of continuous-time A1202 and A1203 that feature fast power-on time and low-noise operation. Device programming is performed after packaging, to ensure increased switchpoint accuracy by eliminating offsets that can be induced by package stress. Unique Hall element geometries and low-offset amplifiers help to minimize noise and to reduce the residual offset voltage normally caused by device overmolding, temperature excursions, and thermal stress.
The A1202 and A1203 Hall-effect bipolar switches include the following on a single silicon chip: voltage regulator, Hall-voltage generator, small-signal amplifier, Schmitt trigger, and NMOS output transistor. The integrated voltage regulator permits operation from 3.8 to 24V. The extensive on-board protection circuitry makes possible a ±30V absolute maximum voltage rating for superior protection in automotive and motor commutation applications, without adding external components. A1202 and A1203 in the family are identical, except for magnetic switchpoints.
The small geometries of the BiCMOS process allow these devices to be provided in ultrasmall packages. The package styles of A1202 and A1203 available provide magnetically optimized solutions for most applications. Package LH is a SOT23W, a miniature low-profile surface-mount package, while package UA is a three-lead ultramini SIP for through-hole mounting. Each package is lead (Pb) free, with 100% matte tin plated leadframes.
A1203 Data Sheet
