onsemi BZX84C6V8ET1

Overview

BZX84C6V8ET1 from onsemi is a 6.8 V, 225 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and low-power reference applications. It delivers nominal Zener voltage of 6.8 V at 5 mA test current, with dynamic impedance of 15 Ω at 5 mA and reverse leakage current ≤2.0 µA at 5.0 V, suitable for voltage clamping in portable power management circuits.

For engineers reviewing the BZX84C6V8ET1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±0.4 V), temperature coefficient (+1.2 mV/°C), ESD rating (>16 kV HBM), and thermal resistance (556 °C/W on FR-5 board).

Technical Context

The BZX84C6V8ET1 operates as a two-terminal voltage reference device with cathode-anode polarity, featuring a non-repetitive peak power capability of 225 W under 8 × 20 µs pulse conditions. Its junction-to-ambient thermal resistance is 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, enabling stable operation across −65 °C to +150 °C junction temperature range.

Zener breakdown is characterized at three test currents (1 mA, 5 mA, 20 mA), with specified voltage ranges of 6.3–7.2 V at 5 mA, 6.4–7.4 V at 20 mA, and 6.3–7.2 V at 1 mA. Capacitance is 155 pF at 0 V bias and 1 MHz, and forward voltage is ≤0.90 V at 10 mA.

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. Maximum soldering temperature is 260 °C for 10 seconds. Cathode indicated by polarity band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5235BLT1 and BZX84-C6V8,115, the BZX84C6V8ET1 offers tighter Zener voltage tolerance (±0.4 V vs ±0.5 V), lower dynamic impedance (15 Ω vs 30 Ω), and industry-standard onsemi qualification-making it optimal for precision reference and space-constrained designs requiring consistent thermal response.

Availability

BZX84C6V8ET1 is available at Aetrix Electronics and suitable for portable power monitoring, USB port overvoltage clamp, and industrial sensor signal conditioning requiring stable component supply, traceable sourcing, and long-term lifecycle support.

Supply support for BZX84C6V8ET1 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 specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.

The BZX84C6V8ET1 belongs to the BZX84CxxxET1 series of 225 mW Zener regulators, engineered for high-density surface-mount applications where minimal board area, reliable voltage reference, and robust ESD performance are critical.

FAQ

What is the Zener voltage tolerance of BZX84C6V8ET1 at 5 mA test current?

The BZX84C6V8ET1 has a Zener voltage range of 6.4 V to 7.2 V at 5 mA test current, corresponding to a nominal 6.8 V with ±0.4 V absolute tolerance. This specification is verified per the onsemi datasheet Rev. 6, page 3, and defines the guaranteed operating window for precision clamping and reference use cases where tight voltage control is required.

Does BZX84C6V8ET1 have a no-connect pin, and how should it be handled on the PCB?

Yes, BZX84C6V8ET1 Pin 2 is explicitly designated as "No Connection" in the official datasheet (page 2, marking diagram and pinout). It must remain unconnected on the PCB layout-no trace, pad, or via should attach to it. This internal lead is unbonded and electrically isolated; connecting it risks mechanical stress, parasitic coupling, or solder wicking that could compromise reliability.

What is the maximum continuous power dissipation of BZX84C6V8ET1 on an FR-5 board?

The BZX84C6V8ET1 is rated for 225 mW total power dissipation on FR-5 board at 25 °C ambient, with linear derating of 1.8 mW/°C above that temperature. This value is defined in the "Maximum Ratings" table (page 1) and reflects real-world thermal performance on standard 1.0 × 0.75 × 0.62 inch FR-5 substrates, not theoretical silicon limits.

How does the temperature coefficient of BZX84C6V8ET1 affect its voltage reference accuracy?

The BZX84C6V8ET1 exhibits a temperature coefficient of +1.2 mV/°C at 5 mA, meaning its Zener voltage increases by 1.2 mV per degree Celsius rise in junction temperature. Over a −40 °C to +85 °C range, this contributes up to ±157 mV drift-critical for applications requiring sub-1% reference stability, where external compensation or tighter thermal management may be needed.

Is BZX84C6V8ET1 compatible with lead-free reflow processes?

Yes, the "G" suffix in BZX84C6V8ET1 indicates Pb-free packaging compliant with RoHS Directive 2011/65/EU. The device supports standard lead-free reflow profiles, including peak temperatures up to 260 °C for 10 seconds, as specified in the Mechanical Characteristics section (page 1) and confirmed in onsemi's Soldering and Mounting Techniques Reference Manual.