Nexperia USA Inc. BZB784-C12-QX

Overview

BZB784-C12-QX from Nexperia is a dual Zener voltage regulator diode in SOT323 (SC-70) package, configured with common anode and two independent cathodes (K1, K2), delivering 12 V ±5% nominal regulation at 5 mA, with 100 nA reverse leakage at VR = 8 V and 100 °C junction temperature rating - used for precision voltage clamping and ESD protection in automotive sensor interfaces.

For engineers reviewing the BZB784-C12-QX datasheet, BZB784-C12-QX pinout, BZB784-C12-QX application, or BZB784-C12-QX equivalent, key selection criteria include its AEC-Q101 qualification, dual-diode topology with shared anode, 12.7 V maximum Zener voltage, 50 Ω typical differential resistance at IZ = 5 mA, and thermal resistance of 140 K/W (2 diodes loaded) on FR4 PCB.

Technical Context

This dual-Zener device integrates two independent 12 V regulation elements sharing a common anode terminal, enabling bidirectional clamping or dual-rail reference generation without external interconnection. Its ±5% VZ tolerance and 7.9 mV/K temperature coefficient (at IZ = 5 mA) support stable operation across −55 °C to +150 °C ambient range.

Designed for automotive-grade reliability, it sustains non-repetitive 40 W peak reverse power dissipation (tp = 100 µs) and 200 mA forward current, with 100 nA IR at VR = 8 V confirming low-leakage performance critical for battery-sensitive systems like body control modules and LIN transceivers.

Key Specifications

Pinout & Package

Package: SOT323 (SC-70), 3-terminal surface-mount plastic package measuring 2.0 mm × 1.25 mm × 0.95 mm with 1.3 mm lead pitch; optimized for high-density automotive PCBs and reflow/wave soldering per IPC-J-STD-020D.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C12LT1G and BZX84-B12-7-F, the BZB784-C12-QX uniquely delivers dual 12 V regulation in one AEC-Q101-qualified SC-70 package, reducing component count by 50% and enabling true bidirectional clamping without layout compromise - essential for space-constrained automotive ECUs.

Availability

BZB784-C12-QX is available at Aetrix Electronics and suitable for automotive sensor interface protection, LIN bus clamping, body control module voltage reference, and infotainment power rail stabilization requiring stable component supply across production lifecycles.

Supply support for BZB784-C12-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 logic, discrete, and MOSFET components, headquartered in Nijmegen, Netherlands, with manufacturing in Europe and Asia.

The BZB784-Q series belongs to Nexperia's automotive-qualified Zener diode portfolio, engineered specifically for robust voltage regulation and transient suppression in harsh-temperature, high-reliability vehicle subsystems.

FAQ

What is the maximum non-repetitive peak reverse current (IZSM) for BZB784-C12-QX?

The BZB784-C12-QX supports a non-repetitive peak reverse current of 40 A at tp = 100 µs, square wave, Tamb = 25 °C, as specified in Table 5 of the datasheet. This value corresponds to its 40 W peak power dissipation rating and is validated for ISO 7637-2 Pulse 5a compliance in automotive load-dump scenarios.

Can BZB784-C12-QX be used for bidirectional ESD protection?

Yes - its common-anode dual-cathode configuration enables symmetrical clamping between any signal line and ground (K1 or K2 to signal, CA to GND) or between two rails (K1 to rail A, K2 to rail B, CA to mid-point). This supports IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) when combined with appropriate series impedance.

Is the 12 V Zener voltage specified at a particular test current?

Yes - the nominal 12 V Zener voltage is specified at IZ = 5 mA, with minimum and maximum values of 11.4 V and 12.7 V respectively (±5% tolerance). The datasheet also provides VZ at IZ = 1 mA (11.3 V min, 12.8 V max) and differential resistance data referenced to this 5 mA condition.

Does BZB784-C12-QX require derating above 25 °C ambient temperature?

Yes - total power dissipation must be linearly derated above Tamb = 25 °C using the thermal resistance Rth(j-a) = 355 K/W (2 diodes loaded). For example, at Tamb = 85 °C, maximum allowable Ptot drops to 175 mW, calculated as (150 °C − 85 °C) / 355 K/W = 0.183 W, consistent with Figure 7 in the datasheet.