Called AH39xxQ, “they also have a 40V absolute maximum rating, enabling them to safely handle 40V load dumps”, according to the company. “Additionally, -18V of reverse voltage protection guards against incorrect battery connections. For added robustness, the ESD [electrostatic discharge] protection exceeds the automotive norms of 5kV HBM [human body model] and 2kV CDM [charge device model].”
The devices operate over 2.7V to 27V (4.7mA) and -40 to +150°C, and are packaged in 3 x 3mm TSOT25.
Each has two sensors built in 1.45mm apart, and they are largely intended to work with quadrature-style magnetic fields.
All together there are eight parts, half (AH397xQ, shown left) with built-in self-diagnostics aimed at ISO 26262 qualification, and half (..376x.) that are otherwise similar but without diagnostics.
There are four parts of each type just mentioned: three include logic to convert the magnetic input signals into a string of speed-related pulses on one open-drain output, with a direction signal on the other output. With these, there is a choice of ±10, 25 or 75Gauss switching thresholds.
The fourth type only comes in ±75Gauss form and omits the decoding logic, instead producing speed-related pulses on both output whose relative phase can be analysed externally.
All parts are AEC-Q100 Grade 0 qualified, are manufactured in IATF 16949 certified facilities, and support PPAP documentation.
