A-selection Zener diodes for precise voltage reference

November 17, 2021 // By Jean-Pierre Joosting
A-selection Zener diodes for precise voltage reference
With the industry’s lowest tolerance of ±1%, the comprehensive product range covers every application from 1.8 V to 75 V.

Nexperia has announced the industry’s first range of A-selection Zener diodes. With a tolerance of just ±1%, the BZT52H-A (SOD123F) and BZX384-A (SOD323) series provide a higher precision voltage reference compared to the B (±2%) and C (±5%) variants. Matching the rising demands of mobile, portable/wearable, automotive and industrial applications and meeting the increasing regulatory requirements, the two series are also available as Q-portfolio devices.

“Nexperia’s A-selection Zener diode range covers every application from 1.8 V to 75 V while providing a precise voltage reference with the lowest possible tolerance,” says Paula Stümer, product manager at Nexperia. “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 MOSFETs.

The A-selection Zener diodes have a nominal working voltage range of 1.8 V to 75 V (E24 range). The devices feature a non-repetitive peak reverse power dissipation of ≤40-W, total power dissipation ≤250 mW and low differential thermal resistance. The low tolerance provides a higher precision voltage, which is especially important for test and measurement applications and enables engineers to replace more costly voltages reference devices. Instead of protecting the MOSFET directly, a more cost-efficient alternative is to connect a Zener diode in parallel to the drain-gate path. Once the Zener breaks through, the MOSFET switches on to stop the drain-source from going into an avalanche breakdown.

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