onsemi BZX84C13ET1

Overview

BZX84C13ET1 from onsemi is a 13 V, 225 mW surface-mount Zener diode in SOT-23 package, with nominal Zener voltage of 13.0 V at 5 mA test current, dynamic impedance of 30 Ω at 5 mA, and reverse leakage current ≤0.1 µA at 10.4 V, used for precision voltage regulation in space-constrained portable electronics.

For engineers reviewing the BZX84C13ET1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode-anode polarity mapping, and automotive-grade AEC-Q101 qualification status - all confirmed for the exact BZX84C13ET1 ordering variant.

Technical Context

The BZX84C13ET1 operates as a two-terminal voltage reference device with cathode-anode polarity, designed for stable DC voltage clamping and regulation in low-power circuits. Its Zener breakdown mechanism provides predictable reverse conduction onset at 13 V ±0.7 V (min/max) under 5 mA test current, with temperature coefficient of +7.0 mV/°C enabling predictable drift compensation.

Thermal performance is defined by junction-to-ambient thermal resistance of 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, supporting operation across −65 °C to +150 °C junction temperature range. Peak pulse power handling reaches 225 W for 8 × 20 µs transients per Figure 9, while ESD robustness exceeds 16 kV HBM Class 3.

Key Specifications

Pinout & Package

SOT-23 (Case 318, Style 8) surface-mount package with void-free thermosetting plastic body, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode identified by polarity band; maximum soldering temperature 260°C for 10 seconds.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84C13ET1, MMBZ5242BS-7-F offers greater pulse robustness but lacks automotive qualification and uses a different package, while BZX84-C13-HE3-08 matches the SOT-23 form factor and voltage grade but trades off 5 Ω higher dynamic impedance and no AEC-Q101 validation - making BZX84C13ET1 optimal for space-constrained, automotive-grade, low-leakage Zener regulation.

Availability

BZX84C13ET1 is available at Aetrix Electronics and suitable for smartphone power management, automotive body control modules, and industrial IoT sensor nodes requiring stable component supply with full traceability and lifecycle continuity.

Supply support for BZX84C13ET1 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, sensors, and connectivity solutions for automotive, industrial, and consumer markets.

The BZX84CxxxET1 series belongs to onsemi's precision Zener voltage regulator product line, engineered for high-density, low-power voltage reference and clamping in portable and automotive electronics where reliability and small footprint are critical.

FAQ

What is the exact Zener voltage tolerance for BZX84C13ET1 at 5 mA test current?

The BZX84C13ET1 has a guaranteed Zener voltage range of 12.4 V (minimum) to 14.1 V (maximum) when measured at I_ZT = 5 mA and T_A = 25°C. This 1.7 V total spread reflects the device's manufacturing tolerance and is specified in the Electrical Characteristics table on page 3 of the official datasheet. The nominal value is 13.0 V, and the BZX84C13ET1 maintains this specification across its qualified operating temperature range.

Is BZX84C13ET1 AEC-Q101 qualified and what does that mean for automotive use?

Yes, the BZX84C13ET1 is explicitly AEC-Q101 qualified and PPAP capable, as stated in the "Specification Features" section of the datasheet. This means the device has passed stress tests including high-temperature operating life, temperature cycling, and ESD robustness required for automotive electronic components. The BZX84C13ET1 is approved for use in non-safety-critical automotive subsystems such as body control modules, infotainment power rails, and sensor interfaces where reliability under extended temperature and vibration conditions is mandatory.

What is the thermal derating behavior of BZX84C13ET1 above 25°C ambient?

The BZX84C13ET1 dissipates 225 mW at T_A = 25°C on FR-5 board, with linear derating at 1.8 mW/°C above that temperature. For example, at 75°C ambient, allowable power drops to 225 mW − (50 × 1.8) = 135 mW. Derating is based on R_JA = 556 °C/W, and the BZX84C13ET1 remains functional up to +150°C junction temperature - meaning thermal design must ensure T_J = T_A + (P_D × R_JA) stays within limits.

Does BZX84C13ET1 have a third pin connection, and how should Pin 2 be handled on the PCB?

No, Pin 2 of the BZX84C13ET1 is internally unconnected (NC), as confirmed in the "Pinout: 1-Anode, 2-No Connection, 3-Cathode" note on page 2 of the datasheet. It must remain electrically floating - no trace, via, or component connection should be made to Pin 2 on the PCB layout. This is a structural feature of the SOT-23 package used for this Zener series, and violating this requirement may compromise device reliability or cause unexpected leakage paths.

How does the temperature coefficient of BZX84C13ET1 affect its voltage stability over temperature?

The BZX84C13ET1 exhibits a positive temperature coefficient of +7.0 mV/°C at I_ZT = 5 mA, meaning its Zener voltage increases by approximately 7 mV for every 1°C rise in junction temperature. Over the full −65°C to +150°C range, this results in a total V_Z shift of roughly 1.5 V. Designers using the BZX84C13ET1 in precision references must account for this drift - for instance, in automotive applications, the BZX84C13ET1's predictable +7.0 mV/°C behavior enables compensation in firmware or analog circuitry.