- BZT52H-A SOD123F 2.6 x 1.6 x 1.1mm (plus leads) and
- BZX384-A SOD323 1.7 x 1.25 x 0.95mm (plus leads)
are described as the company’s ‘A-selection’, hence the suffix in the name.
“By replacing B- or C-selection devices with pad compatible A-selection Zener devices, engineers can go to the limits of the mosfet, if applied to limit voltage for the gate-source path or drain-gate path, or choose from a wider variety of suitable mosfet,” according to Nexperia product manager Paula Stümer – with the drain-gate connection, the Zener is selected to break through and turn the mosfet on before its drain-source goes into avalanche breakdown.
Test and measurement is another potential application, said the company.
The terminal voltage of Zeners is generally far more dependent on current and temperature than with integrated circuit voltage references. In this case, voltages are specified at 5mA up to 24V nominal and 2mA above, with 25°C junctions for both.
Max dissipation is 250mW or 40W peak, according to the company in a statement, although the data sheets make max total dissipation 300mW for the smaller BZX384, or 375 or 830mW for the BZT52H depending on local copper area.
The diodes are also available meeting AEC-Q101 and ISO/TS16949 automotive quality standards for vehicle use, said Nexperia: “Customer demands continue to evolve, and more non-automotive applications require additional quality-related services, such as PPAP [production part approval process] and extended longevity.”
Data sheets:
BZX384-A
BZT52H-A