onsemi SZBZX84C15ET1G

Overview

SZBZX84C15ET1G from onsemi is a 15 V, 250 mW surface-mount Zener diode in SOT-23 package, designed for precision voltage regulation and reference applications with ±0.6 V tolerance at 5 mA test current, 30 Ω dynamic impedance, and 0.05 μA reverse leakage at 12 V. It serves as a stable shunt regulator in power supply feedback loops, overvoltage protection circuits, and voltage reference stages in portable electronics.

For engineers reviewing the SZBZX84C15ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (15 V), power rating (250 mW on FR-5 board), temperature coefficient (+9.2 mV/°C), ESD robustness (>16 kV HBM), and SOT-23 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining a stable reverse-biased breakdown voltage across its cathode-anode terminals under controlled current conditions. Its Zener voltage is specified at three test currents (1 mA, 5 mA, and 20 mA), with corresponding dynamic impedances of 200 Ω, 30 Ω, and 20 Ω respectively - indicating improved regulation stability at higher bias currents.

The SZBZX84C15ET1G features AEC-Q101 qualification, Pb-free RoHS compliance, and a thermal resistance of 500 °C/W on FR-5 board. Its junction temperature range spans −65 °C to +150 °C, and it delivers 225 W peak pulse power handling capability per 8 × 20 μs waveform, supporting transient suppression in compact designs.

Key Specifications

Pinout & Package

SOT-23 (TO-236) plastic surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting case with corrosion-resistant finish, UL 94 V-0 flammability rating, and cathode polarity band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84C15ET1G, SZBZX84C15ET1G adds automotive qualification and tighter process control, while MMSZ5245B-TP trades smaller size for higher power and different thermal behavior - making each optimal for distinct mechanical, reliability, or regulatory constraints.

Availability

SZBZX84C15ET1G is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and portable device voltage reference applications requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.

Supply support for SZBZX84C15ET1G 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 is a global semiconductor manufacturer specializing in energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications, with core expertise in power management, analog, and sensing technologies.

The SZBZX84C15ET1G belongs to onsemi's BZX84CxxxET1G/SZBZX84CxxxET1G Zener regulator family, engineered for high-reliability voltage reference and protection in space-constrained, high-volume portable and automotive systems.

FAQ

What is the nominal Zener voltage and tolerance of SZBZX84C15ET1G?

The SZBZX84C15ET1G has a nominal Zener voltage of 15 V, with a guaranteed range of 13.8 V to 15.6 V at 5 mA test current. This ±0.6 V tolerance reflects manufacturing spread and ensures predictable regulation performance in feedback and reference circuits where tight voltage control is required. The SZBZX84C15ET1G datasheet specifies this range under standard ambient conditions (TA = 25 °C).

How does the temperature coefficient affect SZBZX84C15ET1G performance in wide-temperature applications?

The SZBZX84C15ET1G exhibits a positive temperature coefficient of +9.2 mV/°C at 5 mA, meaning its Zener voltage increases linearly with junction temperature. Over a −40 °C to +125 °C operating range, this results in approximately ±1.5 V drift - a critical factor in precision references. Designers using SZBZX84C15ET1G must account for this in thermal-aware calibration routines or select complementary components to offset drift.

Can SZBZX84C15ET1G replace older BZX84C15 variants in existing designs?

Yes, SZBZX84C15ET1G is a direct drop-in replacement for BZX84C15ET1G in terms of pinout, electrical specs, and package dimensions. The "SZ" prefix denotes enhanced process control and AEC-Q101 qualification, but all key parameters - including V_Z, Z_ZT, P_D, and SOT-23 footprint - match identically. No PCB or schematic changes are needed when upgrading to SZBZX84C15ET1G for automotive or high-reliability use cases.

What is the maximum reverse leakage current for SZBZX84C15ET1G, and at what voltage is it measured?

The maximum reverse leakage current for SZBZX84C15ET1G is 0.05 μA, measured at a reverse voltage (V_R) of 12 V and ambient temperature of 25 °C. This ultra-low leakage ensures minimal parasitic current draw in battery-critical applications such as portable medical devices or always-on sensor nodes where standby power budget is tightly constrained.

Is SZBZX84C15ET1G suitable for surge protection, and what is its peak pulse power rating?

Yes, SZBZX84C15ET1G supports transient suppression with a peak pulse power rating of 225 W for an 8 × 20 μs waveform, as defined in Figure 9 of the datasheet. This capability allows it to safely clamp short-duration overvoltage events - such as ESD or inductive kickback - without degradation, provided average power remains within the 250 mW DC limit. Its 16 kV HBM ESD rating further reinforces system-level robustness.