A forum for people who enjoy electronics as a hobby.
Solid State censors for magnetic fields.
Used to monitor motor speeds and such. A lot of older stuff from Honeywell are on the market these days. These are three pin packages smaller than TO-92. They also come in SOPT-23, but these are not so popular on the surplus market.
The ones I got came from Jameco Electronics and Electronic Goldmine. Basic part numbers are SS4xx. The packages are "D" shaped looking from the top. The curved side is the front where the printing is. These activate on a South magnetic field applied to the back side. Positive B, gauss density in Tesla I think. There seems to be a similar family with the part number SS3xx.
A quick rundown:
SS411A – Bipolar, Activate on +60 B, latches, releases on -60 B.
SS413A – Bipolar, Activate on +140 B, latches, releases on -140 B.
SS441A – Unipolar, Activates on +115 B, releases on +20 B.
SS443A – Unipolar, Activates on +180 B, releases on +75 B.
SS445P – Unipolar, Activates on +180, releases on +105 B. (1)
SS449A – Unipolar, Activates on +390, releases on +235 B.
SS460A – Bipolar, Activates on +30 B, latches, releases on -30 B. (1)
SS461A – Bipolar, Activates on +85 B, latches, releases on -85 B.
SS466A – Bipolar, Activates on +180 B, latches, releases on -180 B.
(1) Internal pull-up resistor on the output. Otherwise, open collector output.
(2) VCC = 2.7 V to 7 V, otherwise 4.5 V to 24 V. 5 V is typical.
A3240E – Unipolar, Activates on +35 B, releases on +25 B. (3)
UGN3130 – Bipolar, Activates on +150 B, latches, releases on -150 B. (3)
(3) Top sensing. Otherwise the flat side is suggested.
A1302UA – Ratiometric Hall Effect Sensor. Outputs 1.3 mV per gauss.
Measures plus and minus B. 0 B is half way between VCC and Gnd.
Goes 1.3 mV higher on +B (South). 1.3 mV lower on –B (North).