Diodes Incorporated PD3Z284C39-7

Overview

PD3Z284C39-7 from Diodes Incorporated is a 39 V, 0.5 W surface-mount Zener diode in PowerDI™323 package, with nominal Zener voltage 39 V (min 37 V, max 41 V) at 2 mA test current, 75 Ω maximum Zener impedance at 2 mA, and 0.1 µA maximum reverse leakage at 33.4 V. It serves as precision voltage reference or overvoltage clamp in low-power power supply feedback paths.

For engineers reviewing the PD3Z284C39-7 datasheet, PD3Z284C39-7 pinout, PD3Z284C39-7 application, or PD3Z284C39-7 equivalent, key selection factors include its AEC-Q101 qualification, ultra-small PowerDI323 footprint, thermal resistance of 250 °C/W, and temperature coefficient of –3.5 mV/°C - critical for automotive sensor biasing and industrial voltage monitoring circuits.

Technical Context

This Zener diode employs planar die construction for stable breakdown characteristics and low noise performance. Its cathode-band polarity and matte tin–plated copper leadframe ensure reliable solderability per MIL-STD-202, Method 208, while the "green" halogen-free molding compound meets UL 94V-0 flammability rating.

Designed for operation across –65 °C to +150 °C, it exhibits a negative temperature coefficient (–3.5 mV/°C), enabling predictable drift compensation in reference circuits. Power derating begins above 25 °C ambient, reaching zero dissipation at 150 °C per the published derating curve.

Key Specifications

Pinout & Package

PowerDI™323 is a 2-terminal surface-mount package with cathode band marking. Terminals are anode (unmarked end) and cathode (banded end); no internal connection to case.

Key Features

Applications

Equivalent & Alternatives

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

Compared with D3Z39BF-7 and BZX384-C39,115, PD3Z284C39-7 offers superior thermal robustness (250 °C/W vs. ~300 °C/W) and automotive qualification - making it the preferred choice for under-hood sensor references and safety-critical clamping where long-term stability outweighs minor size savings.

Availability

PD3Z284C39-7 is available at Aetrix Electronics and suitable for automotive cabin sensors, industrial PLC input conditioning, and medical infusion pump power monitoring requiring stable component supply and traceable sourcing.

Supply support for PD3Z284C39-7 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, headquartered in Plano, Texas, serving automotive, industrial, computing, and consumer markets with high-reliability components.

The PD3ZxxC series belongs to Diodes' AEC-Q101-qualified Zener diode product line, engineered specifically for voltage regulation and transient suppression in harsh-environment automotive and industrial control systems.

FAQ

Is PD3Z284C39-7 suitable for new designs?

No - Diodes Incorporated explicitly marks this part as "NOT RECOMMENDED FOR NEW DESIGNS" in DS32239 Rev. 10-3, advising migration to the D3ZxxBF series. The D3Z39BF-7 offers identical electrical specs with improved manufacturability and extended lifecycle support, while maintaining PowerDI™323 compatibility.

What is the maximum reverse voltage before breakdown?

The guaranteed breakdown occurs between 37 V and 41 V at 2 mA test current. Below 33.4 V, reverse leakage remains ≤0.1 µA; operation above 41 V risks irreversible avalanche damage unless current-limited externally. Derating applies above 25 °C ambient per Figure 1.

How does the PowerDI323 package compare thermally to SOD-323?

PowerDI323 has R_θJA = 250 °C/W on standard polyimide PCB (per AP02001 layout), while typical SOD-323 devices measure ~300–350 °C/W. The larger copper paddle and optimized thermal pad in PowerDI323 enable 20% higher sustained power handling at the same board area, critical for automotive under-hood use.

Can PD3Z284C39-7 replace a 39 V Zener in a feedback loop without recalibration?

Yes - its ±5.1% V_Z tolerance (37–41 V) and –3.5 mV/°C temperature coefficient are fully specified and stable over life. However, due to its "NOT RECOMMENDED FOR NEW DESIGNS" status, system-level validation against D3Z39BF-7 is advised before committing to long-term production.