Nexperia USA Inc. BZB784-C3V0-QX

Overview

BZB784-C3V0-QX from Nexperia is a dual Zener voltage regulator diode in SOT323 (SC-70) package, configured as two cathodes sharing a common anode, with nominal Zener voltage 3.0 V ±5%, 10 µA reverse current at VR = 1 V, and 325 Ω typical differential resistance at IZ = 5 mA - used for precision low-power voltage reference and bidirectional ESD clamping in automotive sensor interfaces.

For engineers reviewing the BZB784-C3V0-QX datasheet, BZB784-C3V0-QX pinout, BZB784-C3V0-QX application, or BZB784-C3V0-QX equivalent, this device supports dual-channel regulation in space-constrained PCB layouts, requires thermal derating above 25 °C ambient, and must be evaluated for simultaneous conduction limits when both diodes operate under reverse bias.

Technical Context

This dual-Zener device implements a common-anode configuration enabling independent regulation or bidirectional transient suppression across two signal paths. Its −1.6 mV/K temperature coefficient at IZ = 5 mA and 450 pF diode capacitance at f = 1 MHz define its stability and high-frequency response in feedback or protection circuits.

Rated for 350 mW total power dissipation with 2-diode loading on FR4 PCB, it operates within −55 °C to +150 °C ambient range and meets AEC-Q101 stress qualification - confirming suitability for under-hood automotive modules where thermal cycling and surge immunity are critical.

Key Specifications

Pinout & Package

Package: SOT323 (SC-70), 3-lead surface-mount plastic package, 2.0 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, FR4-compatible footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-Zener regulation and ESD protection applications.

Compared with DMN3020LSD-13 and BZX84-C3V0,115, the BZB784-C3V0-QX uniquely delivers matched dual-Zener performance in one footprint, enabling tighter thermal tracking, lower parasitic inductance between channels, and reduced BOM count for multi-signal protection schemes.

Availability

BZB784-C3V0-QX is available at Aetrix Electronics and suitable for automotive sensor modules, industrial I/O systems, and USB-C interface protection requiring stable component supply with AEC-Q101 compliance and traceable lot history.

Supply support for BZB784-C3V0-QX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on high-volume, high-reliability essential semiconductors - delivering discrete, logic, and MOSFET solutions optimized for automotive, industrial, and mobile applications.

The BZB784-Q series belongs to Nexperia's AEC-Q101-qualified Zener portfolio, engineered specifically for dual-channel voltage regulation and bidirectional ESD protection in space- and reliability-constrained automotive subsystems.

FAQ

What is the maximum continuous reverse current the BZB784-C3V0-QX can sustain without degradation?

The device supports up to 200 mA forward current (IF), but for reverse (Zener) operation, continuous current is limited by thermal dissipation. At 25 °C ambient with both diodes active on FR4, maximum sustainable IZ per diode is ~105 mA (350 mW ÷ 3.0 V), derating linearly above 25 °C using Rth(j-a) = 355 K/W. Exceeding this causes irreversible junction temperature rise beyond 150 °C.

Can the two cathodes be used at different Zener voltages simultaneously?

No - the BZB784-C3V0-QX has fixed 3.0 V nominal Zener voltage for both diodes. It is not a dual-value device; K1 and K2 share identical VZ characteristics per datasheet Table 8. For mixed-voltage clamping, separate single-Zener devices (e.g., BZB784-C3V0-QX + BZB784-C5V6-QX) must be used.

Is the common anode (CA) pin rated for solder reflow at peak temperatures up to 260 °C?

Yes - the SOT323 package is qualified for standard lead-free reflow profiles (J-STD-020). The CA pin shares the same metallization and thermal mass as other leads; peak temperature of 260 °C for ≤30 seconds is permitted, provided the board layout maintains recommended solder land dimensions (0.55 mm × 1.325 mm per IPC-7351B).

How does the −1.6 mV/K temperature coefficient affect accuracy in a 0 °C to 85 °C operating range?

Over 85 K temperature span, the Zener voltage drift is −1.6 mV/K × 85 K = −136 mV, resulting in VZ shift from 3.0 V to ~2.864 V. This 4.5% deviation must be accommodated in system-level calibration or compensated via external circuitry; it is inherent to the 3.0 V Zener process and confirmed in Fig. 2 of the datasheet.