NXP Semiconductors BZB984-C11,115

Overview

BZB984-C11,115 from Nexperia is a dual Zener voltage regulator diode in SOT663 package, configured as two cathodes (K1, K2) sharing a common anode (CA), with nominal Zener voltage 11 V ±5%, 10.4–11.6 V operating range, and 265 mW power dissipation per diode at 25 °C ambient on FR4 PCB - used for precision low-power voltage reference and bidirectional ESD clamping in space-constrained sensor interfaces.

For engineers reviewing the BZB984-C11,115 datasheet, BZB984-C11,115 pinout, BZB984-C11,115 application, or BZB984-C11,115 equivalent, key selection criteria include Zener voltage tolerance (±5%), dual-cathode common-anode topology, thermal resistance to solder point (230 K/W for single diode), reverse current at 10 V (≤0.1 µA), and non-repetitive peak reverse power (40 W at 100 µs).

Technical Context

This device implements a monolithic dual-Zener structure with shared anode, enabling independent regulation or bidirectional transient suppression from a single ultra-small footprint. Each diode exhibits typical differential resistance of 50 Ω at I_Z = 5 mA and temperature coefficient of +6.9 mV/K across 25–150 °C.

It operates within a junction temperature range of –55 °C to +150 °C and supports surge handling up to 40 W for 100 µs pulses. The SOT663 package features three terminals with defined thermal path to solder point, delivering R_th(j-sp) = 230 K/W for single-diode operation.

Key Specifications

Pinout & Package

SOT663 is a 3-terminal ultra-small flat plastic surface-mount package (1.7 × 1.3 × 0.5 mm), optimized for high-density PCB layouts and reflow soldering only. Thermal performance relies on standard footprint per Figure 10 (Nexperia doc), with solder point acting as primary heat path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5242BS and SMBZ5242-E3/52, BZB984-C11,115 uniquely integrates two matched Zeners in one SOT663 package with shared anode, reducing component count and PCB area by 50% in dual-clamp designs while maintaining ±5% tolerance and sub-µA leakage at 10 V.

Availability

BZB984-C11,115 is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port ESD protection, low-power IoT voltage reference, and automotive cabin interface applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.

Supply support for BZB984-C11,115 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 - including logic, discretes, MOSFETs, and bipolar transistors - with manufacturing rooted in process efficiency and automotive-grade quality systems.

The BZB984 series belongs to Nexperia's precision Zener regulator portfolio, designed specifically for space-constrained, low-power voltage reference and bidirectional transient suppression in industrial, computing, and consumer electronics - emphasizing ultra-small packaging and tight parametric consistency.

FAQ

What is the maximum continuous reverse current the BZB984-C11,115 can sustain at 11 V?

The device is not rated for continuous reverse conduction at V_Z; its specified I_Z test current is 5 mA, and maximum DC power dissipation is 265 mW per diode. Sustained operation above ~24 mA (11 V × 24 mA = 264 mW) risks thermal runaway unless heatsinking is added - design must limit average current to stay within derated P_tot curves per ambient temperature.

Can BZB984-C11,115 be used as a single Zener by leaving one cathode unconnected?

Yes - K1 or K2 may be left floating with no impact on the other diode's regulation characteristics. The internal structure isolates the two Zener junctions; floating one cathode does not alter V_Z, r_dif, or leakage of the active diode. However, unused cathode should be terminated to avoid floating-node noise coupling in high-frequency circuits.

How does the common-anode configuration affect ESD clamping behavior compared to discrete diodes?

The shared CA terminal forces both Zeners to clamp symmetrically to the same reference potential (e.g., ground), enabling true bidirectional voltage limiting between two signal lines and ground. Unlike discrete diodes with separate anodes, this eliminates mismatch in turn-on timing and ensures simultaneous conduction - critical for differential data line protection like USB or RS-485.

Is the 40 W non-repetitive peak power rating applicable to both diodes simultaneously?

No - the 40 W rating applies to a single diode under 100 µs square-wave pulse at T_amb = 25 °C. Simultaneous surge on both diodes would be limited by total package power dissipation (425 mW steady-state), so peak energy must be allocated per diode. For dual-line ESD events, assume ≤20 W per diode to maintain safe junction temperature margin.