NXP Semiconductors BZB984-C4V3,115

Overview

BZB984-C4V3,115 from Nexperia is a dual zener voltage regulator diode in SOT663 package with nominal 4.3 V regulation voltage (±5% tolerance), 410 Ω typical differential resistance at 5 mA, and 3 μA max reverse current at 1 V. It integrates two cathodes and one common anode for compact dual-regulation or ESD-clamp functions in space-constrained power rails.

For engineers reviewing the BZB984-C4V3,115 datasheet, BZB984-C4V3,115 pinout, BZB984-C4V3,115 application, or BZB984-C4V3,115 equivalent, this device serves as a low-power dual-zener solution where board area, thermal resistance to solder point (125 K/W, 2-diode load), and stable 4.3 V reference under 10 mA forward bias are critical selection criteria.

Technical Context

This double zener diode features a common-anode configuration with isolated cathodes (K1, K2), enabling independent regulation paths sharing one anode connection. Its 4.3 V nominal zener voltage is specified at IZ = 5 mA with ±5% tolerance and −1.7 mV/K temperature coefficient.

Thermal design relies on FR4 PCB mounting: junction-to-ambient resistance is 294 K/W (2 diodes loaded) and junction-to-solder-point is 125 K/W - critical for transient surge handling up to 40 W non-repetitive peak power (tp = 100 µs).

Key Specifications

Pinout & Package

SOT663 is an ultra-small flat plastic surface-mount package (1.7 mm × 1.5 mm × 0.5 mm) with three leads and exposed cathode tabs for thermal conduction. Mounting requires reflow only; footprint matches Figure 10 in datasheet Rev. 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5227BS-7-F and BZX84-C4V3,215, the BZB984-C4V3,115 uniquely delivers matched 4.3 V dual regulation in minimal area with highest surge power handling - making it optimal for space-constrained dual-clamp or redundant reference designs.

Availability

BZB984-C4V3,115 is available at Aetrix Electronics and suitable for USB port protection, IoT sensor bias rails, industrial PLC input conditioning, and automotive body control module clamp circuits requiring stable component supply with tight zener voltage control and ultra-compact packaging.

Supply support for BZB984-C4V3,115 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 delivering high-performance, reliable discrete, logic, and MOSFET devices optimized for efficiency and miniaturization in consumer, industrial, and automotive markets.

The BZB984 series belongs to Nexperia's precision zener regulator portfolio, engineered specifically for dual-path voltage reference and ESD protection in ultra-dense portable and embedded systems.

FAQ

What is the maximum continuous current each zener can handle in the BZB984-C4V3,115?

At Tamb ≤ 25 °C on FR4 PCB, each zener supports up to 100 mA DC forward current (IF) and 100 mA reverse current (IZ) before exceeding absolute maximum ratings. However, thermal limits constrain practical continuous operation: with both diodes active, total dissipation must stay ≤ 425 mW - implying ~98 mA at 4.3 V before junction temperature exceeds 150 °C.

Can the BZB984-C4V3,115 be used in avalanche mode for overvoltage protection?

No - the BZB984-C4V3,115 is designed and characterized exclusively for zener breakdown operation at 4.3 V. Its 40 W non-repetitive peak power rating applies only to controlled reverse-bias clamping within the specified 100 µs pulse width and 25 °C ambient; it is not rated or tested for uncontrolled avalanche behavior or sustained overvoltage conditions.

How does the common-anode configuration affect PCB layout versus dual discrete zeners?

The common-anode structure reduces net routing complexity: only one anode trace connects to ground or bias rail, while K1 and K2 route independently to protected nodes. This cuts trace count by one versus two discrete SOT-23 zeners and avoids potential ground loop mismatches between separate anode connections - improving noise immunity in sensitive analog paths.

Is the BZB984-C4V3,115 qualified for automotive applications?

No - per Nexperia's revision history (Rev. 3, Dec 2022), the BZB984 series is explicitly designated as non-automotive qualified. It has not undergone AEC-Q101 stress testing or automotive-grade process qualification. For automotive use, engineers must select parts explicitly marked "AEC-Q101 qualified" and verify compliance with ISO 16750-2 pulse test requirements separately.