Nexperia USA Inc. BZX585-C33,115

Overview

BZX585-C33,115 from Nexperia is a 33 V ±5 % Zener voltage regulator diode in SOD523 (SC-79) surface-mount package, designed for precision voltage reference and overvoltage protection in low-power analog circuits, power supply feedback loops, and microcontroller I/O clamping. It delivers 300 mW total power dissipation, 40 W non-repetitive peak reverse power handling, and 75 Ω typical differential resistance at I_Z = 2 mA.

For engineers reviewing the BZX585-C33,115 datasheet, BZX585-C33,115 pinout, BZX585-C33,115 application, or BZX585-C33,115 equivalent, this device supports stable 33 V regulation under transient surges up to 100 µs, operates across −65 °C to +150 °C, and integrates into space-constrained PCB layouts requiring ultra-small two-terminal discrete regulation.

Technical Context

This Zener diode operates in reverse breakdown mode with a nominal Zener voltage of 33 V at I_Z = 2 mA, exhibiting a temperature coefficient of +29.7 mV/K and reverse current ≤0.05 µA at V_R = 26.4 V. Its low 75 Ω differential resistance ensures tight regulation stability under load variation.

The device uses silicon planar epitaxial construction in an SOD523 package with cathode-marked anisotropic leadframe, enabling thermal resistance from junction to solder point of 65 K/W and junction-to-ambient of 350 K/W on FR4 PCB with 35 mm² copper area.

Key Specifications

Pinout & Package

SOD523 (SC-79) ultra-small flat-lead plastic package with molded cathode band marking; dimensions: 1.25 mm (L) × 0.85 mm (W) × 0.65 mm (H), 2-terminal configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX585-B33,115, the C-series offers cost-effective tolerance for non-critical regulation; versus MMSZ5261B-TP, it trades thermal performance and r_diff for 60 % smaller PCB area-ideal for miniaturized consumer and portable electronics.

Availability

BZX585-C33,115 is available at Aetrix Electronics and suitable for power supply feedback regulation, microcontroller I/O clamping, reference voltage sourcing, and overvoltage detection requiring stable component supply across high-mix, low-volume production runs.

Supply support for BZX585-C33,115 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 BZX585 series belongs to Nexperia's general-purpose Zener diode product line, engineered specifically for space-constrained, cost-sensitive voltage regulation and protection in consumer, industrial, and computing applications.

FAQ

What is the maximum continuous forward current rating for BZX585-C33,115?

The absolute maximum forward current is 200 mA per Table 5 (Limiting Values). However, forward conduction is not its intended operating mode; sustained forward bias above 100 mA risks thermal runaway due to low VF (~1.1 V) and limited P_tot (300 mW). It should only be forward-biased briefly during testing or fault conditions.

Can BZX585-C33,115 be used in place of a 30 V Zener diode for overvoltage protection?

No-its nominal Zener voltage is 33 V with ±5 % tolerance (31.35 V to 34.65 V), so it will not begin regulating until ~31.4 V. Using it as a 30 V clamp risks undervoltage exposure during transients. For 30 V protection, BZX585-C30,115 (30 V ±5 %) is the correct variant per Table 9.

How does the temperature coefficient affect regulation accuracy over −40 °C to +85 °C ambient?

At 33 V, the specified temperature coefficient is +29.7 mV/K. Over a 125 K junction temperature swing (−40 °C to +85 °C), this causes ~3.7 V drift-approximately ±5.6 % of nominal V_Z. System-level compensation (e.g., matched NTC biasing) is required for <±1 % accuracy across that range.

Is the SOD523 package compatible with standard 0402 reflow soldering profiles?

Yes-the SOD523 outline matches JEDEC MS-012 (SC-79) and is qualified for IPC/JEDEC J-STD-020D reflow. Figure 12 specifies a 1.4 mm × 0.5 mm solder land pattern with 0.4 mm solder mask opening; peak temperature must not exceed 260 °C for ≤10 s to avoid package delamination or marking loss.