Nexperia USA Inc. BZB784-C15-QX

Overview

BZB784-C15-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), providing 15 V nominal regulation at ±5% tolerance, 50 nA reverse leakage at VR = 10.5 V, and 200 mA forward current capability - used for precision voltage clamping and bidirectional ESD protection in automotive power rails.

For engineers reviewing the BZB784-C15-QX datasheet, BZB784-C15-QX pinout, BZB784-C15-QX application, or BZB784-C15-QX equivalent, this device supports dual-channel regulation in space-constrained automotive ECUs, requires verification of thermal derating at >25 °C ambient, and demands attention to common-anode layout routing and IEC 61000-4-2 compliance testing.

Technical Context

This dual-Zener diode integrates two independently rated 15 V Zener junctions sharing a single anode terminal, enabling symmetrical clamping across differential or complementary signal paths. Its 10.7 mV/K temperature coefficient and 50 Ω typical differential resistance at IZ = 5 mA ensure stable regulation under varying load and thermal conditions.

The device operates within −55 °C to +150 °C ambient range, qualified per AEC-Q101, with 350 mW total power dissipation (both diodes active) and 140 K/W junction-to-solder-point thermal resistance on FR4 PCB - confirming suitability for under-hood automotive modules where thermal cycling and transient immunity are critical.

Key Specifications

Pinout & Package

SOT323 (SC-70) plastic surface-mount package with 3 leads, 1.3 mm pitch, and tin-plated copper traces on FR4 PCB. Thermal performance optimized for solder-point conduction (Rth(j-sp) = 140 K/W for both diodes loaded).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DMN3020LSD-13 and BZX84-C15-7-F, BZB784-C15-QX uniquely delivers matched dual-Zener regulation in one SC-70 package - reducing component count by 50%, minimizing interconnect inductance for fast transients, and ensuring identical thermal drift across both channels.

Availability

BZB784-C15-QX is available at Aetrix Electronics and suitable for automotive body control modules, infotainment power conditioning, and ADAS camera power conditioning requiring stable component supply, AEC-Q101 traceability, and consistent Zener voltage matching across production lots.

Supply support for BZB784-C15-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 leading semiconductor manufacturer specializing in high-performance, reliable discrete and logic devices, with core expertise in automotive-qualified components and energy-efficient solutions.

BZB784-Q series belongs to Nexperia's AEC-Q101-qualified Zener regulator portfolio, designed specifically for robust voltage reference and transient protection in automotive power domains where space, reliability, and thermal stability are critical.

FAQ

What is the maximum continuous power dissipation for BZB784-C15-QX when both diodes are active?

The total power dissipation is rated at 350 mW at Tamb = 25 °C with both diodes loaded on an FR4 PCB with single-sided copper and standard footprint. Derating is required above 25 °C ambient using Rth(j-a) = 355 K/W - e.g., max 210 mW at 85 °C ambient.

Can BZB784-C15-QX be used for bidirectional ESD protection on a differential bus like RS-485?

Yes - its common-anode dual-cathode structure allows direct connection across A/B lines with CA grounded, clamping positive transients to +15 V via K1 and negative transients to −15 V via K2, achieving symmetrical ±15 V protection with matched Zener characteristics.

How does the temperature coefficient affect regulation accuracy over automotive temperature ranges?

With SZ = +10.7 mV/K, the Zener voltage increases by ~1.07 V from −40 °C to +125 °C (165 K delta), resulting in ~7% shift from nominal 15 V. This is mitigated by design margin in target rails and is within specification for non-precision clamping applications per AEC-Q101.

Is the marking code '9L' unique to BZB784-C15-QX and verifiable on the physical package?

Yes - per Table 4 of the datasheet, '9L' is the exclusive top-side laser marking for BZB784-C15-QX in SOT323 packaging. It appears adjacent to the Nexperia logo on the device body and matches the ordering code suffix '-QX' for tape-and-reel delivery.