onsemi SZBZX84C6V8LT3

Overview

SZBZX84C6V8LT3 from onsemi is a 6.8 V, ±5% tolerance Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 15 Ω dynamic impedance at 5 mA test current and 2 µA reverse leakage at 5 V, used for voltage regulation in space-constrained portable electronics.

For engineers reviewing the SZBZX84C6V8LT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (6.8 V), tolerance (±5%), thermal resistance (556 °C/W), ESD rating (>16 kV HBM), and automotive-grade qualification (AEC-Q101).

Technical Context

This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for stable DC voltage clamping and regulation under reverse bias. Its Zener breakdown mechanism provides predictable voltage stabilization across operating temperatures from −65°C to +150°C.

The SZBZX84C6V8LT3 exhibits a positive temperature coefficient of +1.2 mV/°C at 5 mA, low junction capacitance (155 pF at 0 V, 1 MHz), and forward voltage ≤0.90 V at 10 mA - enabling use in low-power biasing, overvoltage protection, and reference circuits where compact size and reliability are critical.

Key Specifications

Pinout & Package

SOT-23 surface-mount plastic package (Case 318, Style 8), void-free thermosetting construction, corrosion-resistant finish, UL 94 V-0 flammability rating, and cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SZBZX84C6V8LT3, BZX84C6V8LT3 offers identical regulation performance but lacks automotive qualification and traceability, while SZBZX84C6V8LT3G adds Pb-free compliance without altering voltage stability, thermal behavior, or ESD robustness - making it the preferred choice for globally deployed automotive and industrial systems.

Availability

SZBZX84C6V8LT3 is available at Aetrix Electronics and suitable for portable power management, automotive sensor biasing, and industrial I/O protection requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.

Supply support for SZBZX84C6V8LT3 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 power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The SZBZX84CxxxLT3 series belongs to onsemi's automotive-qualified Zener regulator family, engineered specifically for voltage reference and transient suppression in harsh-environment electronics where reliability, small size, and regulatory compliance are mandatory.

FAQ

What is the Zener voltage tolerance of SZBZX84C6V8LT3?

The SZBZX84C6V8LT3 has a nominal Zener voltage of 6.8 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 6.4 V and 7.2 V when tested at 5 mA. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet, and applies across the full operating temperature range of −65°C to +150°C. The SZBZX84C6V8LT3 maintains this specification under standard FR-5 board mounting conditions.

Is SZBZX84C6V8LT3 qualified for automotive applications?

Yes, SZBZX84C6V8LT3 is AEC-Q101 qualified and PPAP capable, as explicitly stated in the Features section of the datasheet. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD (Class 3, >16 kV HBM). The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements, confirming its suitability for production automotive electronics such as body control modules and ADAS sensor interfaces.

What is the thermal resistance of SZBZX84C6V8LT3 on FR-5 board?

The thermal resistance (R_JA) of SZBZX84C6V8LT3 on FR-5 board is 556 °C/W at 25°C ambient, with power derating of 1.8 mW/°C above that temperature. This value is specified in the Maximum Ratings table and directly determines the maximum allowable junction temperature under continuous operation. For example, at 85°C ambient, the device can safely dissipate approximately 115 mW before reaching its 150°C junction limit - a critical parameter for thermal design in enclosed portable devices.

Does SZBZX84C6V8LT3 have a connection on pin 2?

No, pin 2 of SZBZX84C6V8LT3 is internally unconnected (NC), as confirmed in both the Marking Diagram and Electrical Characteristics sections of the datasheet. The device uses only pins 1 (anode) and 3 (cathode) for electrical operation. Pin 2 must not be soldered or routed on the PCB, and its presence is solely for mechanical stability and alignment during SMT assembly - a standard feature of the SOT-23 (Case 318) package.

What is the maximum reverse leakage current for SZBZX84C6V8LT3?

The maximum reverse leakage current (I_R) for SZBZX84C6V8LT3 is 2 µA at 5 V reverse voltage, as specified in the Electrical Characteristics table for the C-series devices. This parameter is measured at 25°C ambient and reflects the diode's ability to block current below its Zener knee. At higher temperatures (e.g., +125°C), leakage increases predictably but remains below 100 µA - a key factor in low-power always-on circuits like real-time clock backup supplies where quiescent current must be minimized.