Diodes Incorporated BZX84C39S-7-F

Overview

BZX84C39S-7-F from Diodes Incorporated is a dual 200 mW surface-mount Zener diode in SOT-363 package, rated for nominal zener voltage 39 V (min 37.0 V, max 41.0 V) at 2 mA test current, with maximum zener impedance 130 Ω at 2 mA and 350 Ω at 0.5 mA, used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84C39S-7-F datasheet, BZX84C39S-7-F pinout, BZX84C39S-7-F application, or BZX84C39S-7-F equivalent, key selection criteria include zener voltage tolerance (±5.1%), low leakage current (0.1 µA at 27.3 V), thermal resistance (625 °C/W), and RoHS-compliant green packaging suitable for space-constrained PCBs.

Technical Context

This dual-element Zener diode integrates two independent 39 V zener junctions in a single SOT-363 package, sharing no internal connection - each anode-cathode pair operates independently. It uses planar die construction for stable breakdown characteristics and low temperature coefficient (33.4 to 41.2 mV/°C).

Rated for operation from –65 °C to +150 °C, it delivers regulated reference voltage under reverse bias with specified dynamic impedance across 0.5–2 mA test range, and supports ultra-low reverse leakage (≤0.1 µA at VR = 27.3 V), enabling use in battery-powered voltage monitor circuits.

Key Specifications

Pinout & Package

SOT-363 (SC-70-6) surface-mount plastic package with six terminals: two NC (no-connect), two anodes (A1, A2), and two cathodes (C1, C2). Pin assignment confirmed per Diodes Inc. DS30108 Rev. 17 top-view diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5267BS-7-F and BZX84C39LT1G, BZX84C39S-7-F uniquely delivers two matched 39 V zeners in one SOT-363, reducing component count and layout complexity for dual-reference or differential-clamp designs without sacrificing voltage tolerance or thermal performance.

Availability

BZX84C39S-7-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and portable medical device power management requiring stable component supply and long-term obsolescence mitigation.

Supply support for BZX84C39S-7-F 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, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BZX84 series belongs to Diodes' precision Zener diode product line, engineered for compact, low-power voltage regulation and protection in space-constrained consumer, computing, and industrial applications.

FAQ

What is the maximum reverse voltage this device can withstand before breakdown?

The BZX84C39S-7-F has a nominal zener voltage of 39 V with guaranteed minimum 37.0 V and maximum 41.0 V at 2 mA test current. Breakdown occurs within this range under reverse bias; operation above 41.0 V risks exceeding absolute maximum ratings and may cause irreversible damage.

Can both zener elements be used simultaneously in the same circuit?

Yes - the two zener elements are electrically isolated and share no internal connection. They can operate independently, such as one for reference and one for clamping, or in back-to-back configuration for bidirectional signal limiting, provided each stays within its 200 mW power limit.

Is this part suitable for use in high-reliability automotive applications?

It meets AEC-Q200 stress test requirements for passive components and operates from –65 °C to +150 °C. However, Diodes Incorporated does not classify it as AEC-Q101 qualified; for safety-critical automotive subsystems, consult the manufacturer's qualification reports before deployment.

How does the 625 °C/W thermal resistance affect practical PCB layout?

This value assumes mounting on FR4 with Diodes' recommended pad layout (document AP02001). To maintain junction temperature below 150 °C at full 200 mW dissipation, ambient must stay below 25 °C - derating is required above that, per Fig. 1 power derating curve.