Diodes Incorporated D3Z33BF-7

Overview

D3Z33BF-7 from Diodes Incorporated is a 0.4W surface-mount precision Zener diode with nominal zener voltage 33.0V (min 32.15V, max 33.79V at I_ZT = 5mA), ±2.5% tolerance, and 40Ω dynamic impedance at 5mA. It features tight voltage regulation for reference and protection circuits in power supply feedback loops, voltage clamping, and overvoltage protection in industrial control modules.

For engineers reviewing the D3Z33BF-7 datasheet, D3Z33BF-7 pinout, D3Z33BF-7 application, or D3Z33BF-7 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (312.5°C/W), low leakage (<0.05μA at 25V), temperature coefficient (+25mV/°C), and SOD323F package compatibility with automated pick-and-place assembly.

Technical Context

This Zener diode operates in reverse breakdown mode with precise voltage stabilization across a 5mA test current. Its low 40Ω zener impedance ensures minimal output variation under load changes, while the +25mV/°C temperature coefficient enables predictable drift compensation in temperature-sensitive references.

The device is rated for 400mW power dissipation on FR-4 PCB with defined pad layout, and derates linearly above +25°C ambient per Figure 1. Reverse leakage remains below 0.05μA at 25V, supporting high-impedance sensing nodes and low-power standby circuits.

Key Specifications

Pinout & Package

Package: SOD323F - ultra-compact surface-mount plastic package (1.25 mm × 1.70 mm × 0.95 mm), halogen- and antimony-free, RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C33-7-F and MMSZ5257ET1G, D3Z33BF-7 delivers superior voltage accuracy (±2.5% vs. ±5%), identical low impedance (40Ω), and highest power capability (400mW) in the smallest footprint-making it optimal for space-constrained, high-stability reference designs.

Availability

D3Z33BF-7 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, precision reference generation, and temperature-compensated bias networks requiring stable component supply and full RoHS/Green compliance.

Supply support for D3Z33BF-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, automotive, and computing applications.

The D3Z series belongs to Diodes' precision Zener diode product line, engineered specifically for stable voltage reference and clamping in compact, high-volume surface-mount designs where tight tolerance and low leakage are critical.

FAQ

What is the maximum reverse voltage this Zener can safely clamp without damage?

The D3Z33BF-7 is rated for continuous operation up to its specified zener voltage range (32.15–33.79V at 5mA). Its absolute maximum non-repetitive peak reverse voltage is not explicitly defined in DS35437, but sustained operation beyond 36V risks thermal runaway due to power dissipation exceeding 400mW. For transient clamping, it must be used with current-limiting resistors to keep instantaneous power within safe limits.

Does this part meet AEC-Q200 stress testing requirements for automotive use?

No-D3Z33BF-7 is not AEC-Q200 qualified. The datasheet states that automotive-grade versions require specific change control, PPAP capability, and manufacturing in IATF 16949-certified facilities; users must contact Diodes directly for AEC-Q200-compliant variants such as the AZ series. This part is intended for industrial and commercial applications.

How does the +25mV/°C temperature coefficient affect long-term reference stability?

The +25mV/°C coefficient means the zener voltage increases by approximately 25mV per degree Celsius rise in junction temperature. Over a –40°C to +125°C ambient range, this results in ~4.1V total drift. For stable references, designers must either limit self-heating (via power derating), use temperature-compensation circuitry, or select lower-TC devices like the D3Z10BF (–2.4mV/°C) for tighter thermal performance.

Can this Zener be used in forward-bias mode as a regular diode?

Yes-the D3Z33BF-7 has a typical forward voltage of 0.9V at 10mA, matching standard silicon diode behavior. However, its primary design intent is reverse-bias regulation. Forward conduction is only specified for testing and ESD protection paths; sustained forward operation is not characterized for reliability or lifetime and should be avoided in critical signal paths.