onsemi SZBZX84C8V2LT1

Overview

SZBZX84C8V2LT1 from onsemi is a 225 mW, 8.2 V nominal Zener voltage regulator diode in SOT-23 package, designed for precision voltage reference and overvoltage protection in space-constrained circuits. It delivers ±5% tolerance at 5 mA test current, 15 Ω dynamic impedance, and operates across −65°C to +150°C junction temperature range. Used in portable power rails, voltage clamping in USB interfaces, and biasing networks for analog sensors.

For engineers reviewing the SZBZX84C8V2LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (556 °C/W on FR-5), ESD rating (>16 kV HBM), reverse leakage (0.7 µA @ 6.6 V), and automotive-grade qualification (AEC-Q101).

Technical Context

This device functions as a two-terminal shunt voltage regulator, maintaining stable output voltage by conducting reverse current above its specified Zener breakdown threshold. Its operation relies on controlled avalanche and Zener mechanisms depending on voltage level - at 8.2 V, both contribute with a positive temperature coefficient of +3.2 mV/°C.

The SOT-23 package enables automated placement and reflow soldering, while the cathode-anode pinout (Pin 3 = Cathode, Pin 1 = Anode, Pin 2 = NC) supports unidirectional clamping. Thermal derating is linear at 1.8 mW/°C above 25°C ambient on FR-5 board.

Key Specifications

Pinout & Package

SOT-23 (Case 318-08) surface-mount plastic package with void-free thermosetting molding, corrosion-resistant finish, and UL 94 V-0 flammability rating. 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 SZBZX84C8V2LT1, BZX84C8V2LT1 omits automotive qualification and traceability controls, while SZBZX84C8V2LT3G offers identical performance in higher-volume packaging - enabling seamless transition from prototyping to volume manufacturing without layout or schematic modification.

Availability

SZBZX84C8V2LT1 is available at Aetrix Electronics and suitable for automotive ECUs, portable medical monitors, and industrial IoT edge nodes requiring stable component supply with full AEC-Q101 documentation and lot-level traceability.

Supply support for SZBZX84C8V2LT1 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 and SiC solutions for automotive, industrial, cloud, and intelligent devices.

SZBZX84CxxxLT1G series belongs to onsemi's automotive-qualified Zener regulator portfolio, engineered for robust voltage reference and transient suppression in harsh environments where reliability and qualification rigor are mandatory.

FAQ

What is the Zener voltage tolerance of SZBZX84C8V2LT1 at 5 mA test current?

The SZBZX84C8V2LT1 has a nominal Zener voltage of 8.2 V with a tolerance of ±5% at IZT = 5 mA, meaning the actual breakdown voltage falls between 7.7 V and 8.7 V under standard test conditions. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official datasheet. The SZBZX84C8V2LT1 maintains this specification across its qualified operating temperature range and is validated per AEC-Q101 requirements.

Does SZBZX84C8V2LT1 have a no-connect pin, and how is it identified in the SOT-23 package?

Yes, SZBZX84C8V2LT1 has Pin 2 designated as "No Connection" - it is internally isolated and must not be soldered or routed on the PCB. In the SOT-23 package, Pin 1 is the anode, Pin 2 is NC, and Pin 3 is the cathode (marked by a polarity band). This pinout is explicitly defined in the marking diagram and Electrical Characteristics section of the datasheet, and applies identically to all BZX84CxxxLT1 and SZBZX84CxxxLT1G variants.

Is SZBZX84C8V2LT1 qualified for automotive applications, and what does the "SZ" prefix signify?

Yes, SZBZX84C8V2LT1 is AEC-Q101 qualified and PPAP capable. The "SZ" prefix denotes compliance with automotive-specific quality, traceability, and change-control requirements - including unique site controls, extended reliability testing, and enhanced process monitoring beyond standard commercial-grade parts like BZX84C8V2LT1. This makes the SZBZX84C8V2LT1 suitable for safety-critical automotive subsystems such as body control modules and ADAS power domains.

What is the maximum reverse leakage current for SZBZX84C8V2LT1, and at what voltage is it specified?

The maximum reverse leakage current for SZBZX84C8V2LT1 is 0.7 µA, specified at VR = 6.6 V (80% of nominal Zener voltage). This value is measured at TA = 25°C and appears in the Electrical Characteristics table for the C-series devices. The low leakage supports ultra-low-power operation in battery-backed systems and ensures minimal parasitic loading on sensitive reference nodes in precision analog circuits using the SZBZX84C8V2LT1.

Can SZBZX84C8V2LT1 be used in high-density PCB layouts, and what package features support this?

Yes, SZBZX84C8V2LT1 is optimized for high-density PCB layouts via its SOT-23 (Case 318-08) package - measuring just 2.9 mm × 1.3 mm × 1.0 mm with 0.95 mm lead pitch. Its transfer-molded thermosetting plastic case, corrosion-resistant finish, and UL 94 V-0 rating enable reliable reflow soldering in fine-pitch assemblies. The package is explicitly described in the datasheet as "designed for optimal automated board assembly," supporting pick-and-place accuracy and thermal reliability in multi-layer boards with tight spacing constraints.