onsemi BZX84C62ET3

Overview

BZX84C62ET3 from onsemi is a 62 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and overvoltage protection in space-constrained circuits. It delivers nominal Zener voltage of 62 V at 5 mA test current, with dynamic impedance of 215 Ω at 5 mA and ≤120 μA reverse leakage at 49.6 V.

For engineers reviewing the BZX84C62ET3 datasheet, pinout, applications, or equivalent options, key selection criteria include its ±5% voltage tolerance, −55°C to +150°C operating range, 16 kV HBM ESD rating, AEC-Q101 qualification, and suitability for low-power voltage reference and transient suppression in portable electronics and automotive ECUs.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its cathode-anode terminals under varying load and temperature conditions. Its thermal resistance is 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, supporting reliable power dissipation up to 225 mW at 25°C ambient.

The device features a temperature coefficient of +43.4 mV/°C at 5 mA, enabling predictable voltage drift compensation in reference designs. Pin 2 is internally unconnected - only pins 1 (anode) and 3 (cathode) are electrically active - simplifying layout and eliminating floating node concerns.

Key Specifications

Pinout & Package

SOT-23 (Case 318, Style 8) surface-mount package with void-free thermosetting plastic case, UL 94 V-0 flammability rating, and corrosion-resistant solderable finish. Cathode indicated by polarity band on package top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84C62ET3, BZX84C62LT1G offers higher continuous power (300 mW vs. 225 mW) for extended transient absorption, while SZBZX84C62ET3G provides identical performance with added automotive qualification rigor - neither is pin-compatible drop-in replacement due to distinct ordering suffixes and documentation scope.

Availability

BZX84C62ET3 is available at Aetrix Electronics and suitable for portable power management, automotive sensor interface, industrial PLC input conditioning, and USB-C power delivery monitoring requiring stable component supply and long-term sourcing continuity.

Supply support for BZX84C62ET3 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The BZX84CxxxET3 series belongs to onsemi's precision Zener voltage regulator product line, engineered for compact, high-reliability voltage reference and overvoltage protection in space- and power-constrained systems.

FAQ

What is the Zener voltage tolerance of BZX84C62ET3?

The BZX84C62ET3 has a nominal Zener voltage of 62 V with a tolerance of ±5%, meaning the actual measured voltage at 5 mA test current falls between 58 V and 66 V. This tolerance is specified in the Electrical Characteristics table on page 3 of the official datasheet and applies under standard test conditions (T_A = 25°C). The BZX84C62ET3 maintains this specification across its qualified operating temperature range.

Is BZX84C62ET3 suitable for automotive applications?

Yes, the BZX84C62ET3 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications such as sensor interface protection and ECU power rail clamping. Its operating junction temperature range of −55°C to +150°C, 16 kV HBM ESD rating, and qualification for temperature cycling and mechanical stress meet automotive reliability requirements. However, for full PPAP submission, the SZ-prefix variant (e.g., SZBZX84C62ET3G) is recommended.

What is the function of Pin 2 on BZX84C62ET3?

Pin 2 of the BZX84C62ET3 is internally unconnected (NC) and serves no electrical function. The device uses only Pins 1 (Anode) and 3 (Cathode) for operation. This configuration is explicitly stated in the datasheet's pinout diagram and electrical characteristics notes. Leaving Pin 2 unconnected on the PCB avoids unintended coupling or parasitic effects and aligns with onsemi's recommended layout practices for the SOT-23 package.

How does the temperature coefficient affect BZX84C62ET3 performance?

The BZX84C62ET3 exhibits a positive temperature coefficient of +43.4 mV/°C at 5 mA, meaning its Zener voltage increases predictably with rising junction temperature. This behavior enables designers to compensate for thermal drift in precision reference circuits - for example, by pairing with negative-TC components or applying software calibration. The coefficient remains stable across the −55°C to +150°C operating range, as confirmed in Figure 1 of the datasheet.

What packaging options are available for BZX84C62ET3?

The BZX84C62ET3 is supplied in Pb-free SOT-23 packages on 10,000-unit tape-and-reel format, as indicated by the "ET3" suffix. It is not offered in cut-tape, tray, or tube configurations. The "G" suffix (e.g., BZX84C62ET3G) denotes the same Pb-free construction with additional environmental compliance documentation. All variants use Case 318, Style 8 mechanical dimensions per the package drawing on page 6 of the datasheet.