Diodes Incorporated BZX84C47-7

Overview

BZX84C47-7 from Diodes Incorporated is a 47 V, 350 mW surface-mount Zener diode in SOT-23 package, rated for 2 mA test current with 44.0–50.0 V zener voltage tolerance, 170 Ω dynamic impedance at 2 mA, and ±10.0 to ±12.0 mV/°C temperature coefficient-used for precision voltage reference and overvoltage protection in low-power DC rails.

For engineers reviewing the BZX84C47-7 datasheet, BZX84C47-7 pinout, BZX84C47-7 application, or BZX84C47-7 equivalent, key selection criteria include zener voltage tolerance (±3.2%), thermal resistance (357 °C/W), reverse leakage (≤0.1 μA at 30.1 V), RoHS-compliant green molding compound, and compatibility with automated SMT assembly on FR-4 PCBs.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation under controlled current conditions. Its planar die construction ensures consistent breakdown characteristics, while the SOT-23 package supports high-density PCB layouts and reflow soldering per J-STD-020D Level 1 moisture sensitivity.

The device exhibits a nominal 47 V zener voltage at 2 mA test current, with typical temperature coefficient of +32.9 mV/°C and maximum zener impedance of 170 Ω at 1 kHz. It delivers 350 mW power dissipation when leads are held at ambient temperature, derating linearly above 25°C per Fig. 1.

Key Specifications

Pinout & Package

Package: SOT-23 - three-terminal surface-mount plastic case (UL 94V-0), 0.008 g weight, matte tin-plated Alloy 42 leadframe, polarity indicated by cathode band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ47VCW and BZX84-B47, the BZX84C47-7 offers optimal balance of voltage tolerance (±3.2%), thermal coefficient (+32.9 mV/°C), and power capability (350 mW) for industrial-grade clamp and reference designs requiring robustness across temperature and transient stress.

Availability

BZX84C47-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, programmable logic controller input protection, and IoT node battery monitoring reference designs requiring stable component supply and long-term lifecycle support.

Supply support for BZX84C47-7 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 centers across Asia and manufacturing in China, Taiwan, and Malaysia.

The BZX84 series belongs to Diodes' general-purpose Zener diode product line, engineered for reliable voltage regulation and transient suppression in cost-sensitive, high-volume consumer, industrial, and computing applications.

FAQ

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

The BZX84C47-7 has a nominal zener voltage of 47 V at 2 mA test current, with guaranteed breakdown occurring between 44.0 V and 50.0 V. It is not rated for continuous operation above 50.0 V - exceeding this may cause irreversible thermal damage due to uncontrolled power dissipation beyond its 350 mW limit.

Can this Zener diode be used in place of a TVS for ESD protection?

No - the BZX84C47-7 is designed for steady-state voltage regulation, not transient suppression. Its 350 mW power rating and 170 Ω impedance make it unsuitable for fast, high-energy ESD events. Dedicated TVS diodes like PESD5V0S1BA have sub-nanosecond response and 300 W peak pulse power, which this Zener cannot replicate.

Does the SOT-23 package require special PCB layout considerations?

Yes - the datasheet specifies a recommended pad layout (AP02001.pdf) to achieve the 357 °C/W thermal resistance. Use minimum 0.5 mm wide traces for anode/cathode connections, avoid thermal reliefs on pads, and ensure ≥1.5 mm clearance to adjacent copper to prevent solder bridging and enable proper reflow profile control.

Is the BZX84C47-7 compatible with lead-free reflow soldering?

Yes - it features matte tin-plated Alloy 42 leads qualified for Pb-free reflow per JEDEC J-STD-020D Level 1 moisture sensitivity. Peak reflow temperature must not exceed 260°C for ≤10 seconds, and preheat ramp rate should be ≤3°C/s to avoid package cracking or delamination.