Nexperia USA Inc. BZX384-B11,115

Overview

BZX384-B11,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 11 V nominal breakdown voltage at 5 mA, 300 mW total power dissipation, and 150 °C maximum junction temperature. It serves as a precision low-power reference or clamp in power supply feedback loops, sensor biasing, and overvoltage protection circuits.

For engineers reviewing the BZX384-B11,115 datasheet, BZX384-B11,115 pinout, BZX384-B11,115 application, or BZX384-B11,115 equivalent, key selection criteria include its 11 V ±2 % Zener voltage tolerance, 150 Ω typical differential resistance at 5 mA, 0.9 V forward voltage at 10 mA, and thermal resistance of 415 K/W (junction-to-ambient).

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and input conditions. Its regulation relies on controlled avalanche and Zener mechanisms, with temperature coefficient of +5.4 mV/K at 5 mA - indicating positive drift with rising temperature within its 11 V rating.

Designed for surface-mount use on FR4 PCBs with single-sided copper, it supports pulsed non-repetitive peak reverse power up to 40 W (100 μs pulse), while continuous operation is limited to 300 mW at ≤25 °C ambient. The cathode-anode polarity is marked by a bar on the SOD323 body.

Key Specifications

Pinout & Package

The BZX384-B11,115 is housed in a SOD323 (SC-76) plastic surface-mount package measuring 1.8 mm × 1.35 mm × 0.95 mm, with gull-wing leads and cathode-marked top-side bar.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5240BS-7-F, BZX384-B11,115 offers tighter 11 V regulation and superior thermal performance in the same board area; versus BZX384-C11,115, it delivers twice the voltage accuracy at no package or power penalty - critical for closed-loop stability and metrology-grade designs.

Availability

BZX384-B11,115 is available at Aetrix Electronics and suitable for power supply feedback reference, sensor biasing, overvoltage clamp protection, and microcontroller I/O pin protection requiring stable component supply and consistent ±2 % Zener voltage performance.

Supply support for BZX384-B11,115 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 logic, discrete, and MOSFET solutions, headquartered in Nijmegen, Netherlands.

The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered for low-power voltage regulation and clamping in space-constrained industrial, computing, and consumer applications where SOD323 packaging and tight tolerances are essential.

FAQ

What is the Zener test current for BZX384-B11,115 and why does it matter?

The specified Zener voltage of 10.80 V to 11.20 V is measured at a test current of 5 mA. This current establishes the operating point where differential resistance and temperature coefficient are characterized. Operating significantly below 5 mA increases dynamic impedance and degrades regulation accuracy, while exceeding recommended power limits risks thermal runaway.

Can BZX384-B11,115 be used in place of a 12 V Zener diode?

No - BZX384-B11,115 has a nominal Zener voltage of 11 V with ±2 % tolerance (10.80–11.20 V), not 12 V. Substituting it for a true 12 V Zener would result in undershoot of ~1 V under regulation, potentially causing functional failure in circuits relying on precise 12 V thresholds such as brown-out detection or relay drive.

How does the temperature coefficient affect long-term stability in a 11 V reference design?

At 5 mA, BZX384-B11,115 exhibits a +5.4 mV/K temperature coefficient, meaning its Zener voltage increases by approximately 5.4 mV per degree Celsius rise. Over a 100 °C range (−25 °C to +75 °C), this introduces up to ±540 mV drift - a critical factor requiring compensation in precision references, unlike zero-TC or compensated references.

Is the SOD323 package compatible with standard reflow soldering profiles?

Yes - Nexperia specifies a reflow soldering footprint for SOD323 with 0.5 mm pad width and 2.2 mm center-to-center spacing. The device is qualified for JEDEC J-STD-020 moisture sensitivity level 1 and withstands peak reflow temperatures up to 260 °C, making it compatible with standard lead-free (SnAgCu) reflow processes without special handling.