Diodes Incorporated BZX84C24S-7

Overview

BZX84C24S-7 from Diodes Incorporated is a dual 200 mW surface-mount Zener diode in SOT-363 package, rated for 24 V nominal Zener voltage (22.8–25.6 V range at 5 mA), with 70 Ω maximum Zener impedance at test current and 0.1 µA maximum reverse leakage at 16.8 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.

For engineers reviewing the BZX84C24S-7 datasheet, BZX84C24S-7 pinout, BZX84C24S-7 application, or BZX84C24S-7 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at 5 mA, thermal resistance (625 °C/W), and SOT-363 footprint compatibility with high-density PCB layouts.

Technical Context

This dual-Zener device integrates two independent 24 V Zener junctions in a single SOT-363 package, sharing no internal connection - terminals C1/A1 and C2/A2 form two isolated anode-cathode pairs. Each junction exhibits tight 22.8–25.6 V breakdown at I_ZT = 5 mA, with temperature coefficient ranging from +18.4 to +22.0 mV/°C.

It operates across –65 °C to +150 °C ambient, with power derating beginning above 25 °C per the 200 mW absolute maximum rating. Thermal resistance of 625 °C/W assumes mounting on FR4 with Diodes Inc.'s recommended pad layout, limiting usable DC power to ~120 mW at 75 °C ambient.

Key Specifications

Pinout & Package

SOT-363 package: 6-pin, dual-row, surface-mount plastic case (UL 94V-0), 0.006 g weight, moisture sensitivity level 1. Pin 1 (NC) and Pin 6 (NC) are no-connect; Pin 2 (C1) and Pin 3 (A1) form first Zener; Pin 4 (A2) and Pin 5 (C2) form second Zener.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5242BS-7-F and BZX84C24LT1G, BZX84C24S-7 uniquely delivers two matched 24 V Zeners in one SOT-363, enabling compact dual-rail supervision or redundancy without inter-device parameter mismatch - critical where layout density and thermal coupling matter.

Availability

BZX84C24S-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control module voltage clamp, and medical portable diagnostic device power supervision requiring stable component supply and long-term lifecycle support.

Supply support for BZX84C24S-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, with design and manufacturing operations across Asia and the Americas.

The BZX84 series belongs to Diodes' standard Zener diode product line, engineered for precision voltage regulation and transient suppression in space-constrained, high-reliability applications across industrial, automotive, and medical end markets.

FAQ

What is the maximum continuous Zener current for BZX84C24S-7 at 75°C ambient?

At 75°C ambient, derated power is 120 mW (per Fig. 1). With V_Z ≈ 24 V, maximum continuous Zener current is ~5 mA (120 mW ÷ 24 V). Exceeding this risks junction temperature exceeding 125°C, accelerating parametric drift and failure.

Can Pins 1 and 6 be used as thermal pads or grounded for improved heat dissipation?

No - Pins 1 and 6 are confirmed no-connect (NC) terminals with no internal bond wire or die connection. Grounding or soldering them provides no thermal benefit and may introduce noise coupling or mechanical stress into the package mold compound.

How does the +18.4 to +22.0 mV/°C temperature coefficient affect regulation accuracy over –40°C to +85°C?

Over that 125°C span, Zener voltage shifts by +2.3 to +2.75 V - a ±5.7% deviation from 24 V nominal. For applications requiring tighter stability, external compensation or post-regulation LDOs are necessary; the device is intended for coarse reference or clamping, not metrology-grade regulation.

Is BZX84C24S-7 suitable for bidirectional ESD protection on a 24 V data line?

No - it is a unidirectional Zener diode optimized for reverse-bias regulation/clamping. For bidirectional ESD protection, a dedicated TVS array like D3V3Z5U-7-F (3.3 V, bidirectional) or SMAJ24A (24 V, unidirectional TVS) is required; BZX84C24S-7 lacks specified ESD robustness or clamping speed.