onsemi SZBZX84C36LT1G

Overview

SZBZX84C36LT1G from onsemi is a 36 V ±5.6% Zener diode in SOT-23 package, rated for 250 mW power dissipation on FR-5 board at 25°C, with 90 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 28.8 V. It serves as a precision voltage reference or overvoltage clamp in low-power portable electronics.

For engineers reviewing the SZBZX84C36LT1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance (±5.6%), thermal coefficient (+25.2 mV/°C), ESD robustness (>16 kV HBM), and automotive-grade qualification per AEC-Q101.

Technical Context

This device operates as a two-terminal voltage-regulating diode with cathode-anode polarity, designed for stable reverse-biased breakdown at 36 V nominal. Its Zener impedance of 90 Ω at 5 mA and 350 Ω at 20 mA defines regulation accuracy under varying load currents.

The SZBZX84C36LT1G features a positive temperature coefficient of +25.2 mV/°C, indicating increasing Zener voltage with rising junction temperature. It is Pb-free, RoHS-compliant, and qualified to AEC-Q101 for automotive use, with Class 3 ESD rating (>16 kV HBM).

Key Specifications

Pinout & Package

Package: SOT-23 (TO-236), 2.90 mm × 1.30 mm × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish; cathode indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84C36LT1G and SZBZX84C33LT1G, the SZBZX84C36LT1G uniquely delivers automotive-grade reliability at 36 V nominal while maintaining identical footprint and thermal performance - enabling drop-in replacement in AEC-Q101 programs without layout changes.

Availability

SZBZX84C36LT1G is available at Aetrix Electronics and suitable for automotive infotainment systems, portable medical monitors, and industrial PLC input stages requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SZBZX84C36LT1G 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 supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, and IoT applications.

The SZBZX84CxxxLT1G series belongs to onsemi's automotive-qualified Zener regulator portfolio, engineered specifically for voltage reference and transient suppression in harsh-environment electronic control units.

FAQ

What is the maximum reverse voltage that SZBZX84C36LT1G can safely clamp?

The SZBZX84C36LT1G is specified to regulate at 34–38 V at 5 mA, with absolute maximum reverse voltage limited by its 250 mW power rating. At 25°C, sustained reverse voltage above 38 V risks exceeding power dissipation limits unless current is strictly limited below 6.6 mA. The device is not rated for avalanche operation beyond its Zener breakdown region.

Does SZBZX84C36LT1G require a series current-limiting resistor in all applications?

Yes - SZBZX84C36LT1G must always be used with a series resistor to limit forward or reverse current. Without it, excessive current during breakdown will exceed the 250 mW rating and cause thermal runaway. Typical designs use resistors sized to maintain Zener current between 1 mA and 20 mA depending on regulation stability and power budget requirements.

How does the temperature coefficient of SZBZX84C36LT1G affect its performance in automotive under-hood environments?

The SZBZX84C36LT1G has a +25.2 mV/°C temperature coefficient, meaning its Zener voltage increases by approximately 2.52 V over a 100°C rise (e.g., from −40°C to +60°C). In under-hood applications, this drift must be accounted for in reference voltage tolerances; however, AEC-Q101 validation ensures stable operation across the full −55°C to +150°C junction range.

Can SZBZX84C36LT1G replace BZX84C36LT1G in an existing design?

SZBZX84C36LT1G is a direct functional and mechanical replacement for BZX84C36LT1G, sharing identical electrical specs, SOT-23 package, and pinout. The "SZ" prefix adds AEC-Q101 qualification, PPAP capability, and automotive-specific process controls - making it suitable for automotive designs without altering PCB layout or schematic.

What is the significance of the "LT1G" suffix in SZBZX84C36LT1G?

The "LT1G" suffix denotes lead-free (Pb-free), RoHS-compliant packaging in tape-and-reel format (3,000 units per reel), using SOT-23 case 318 style 8. The "G" confirms compliance with JEDEC standards for green packaging, while "LT1" specifies the standard 3,000-unit reel configuration optimized for automated SMT assembly.