Diodes Incorporated BZT52C18LP-7

Overview

BZT52C18LP-7 from Diodes Incorporated is a surface-mount Zener diode with nominal zener voltage 18 V, ±5.6% tolerance (16.8–19.1 V), 45 Ω maximum zener impedance at 5 mA, 250 mW power dissipation, and DFN1006-2 package. It provides precise voltage regulation in low-power biasing, overvoltage protection, and reference circuits for automotive body control modules and industrial sensor signal conditioning.

For engineers reviewing the BZT52C18LP-7 datasheet, BZT52C18LP-7 pinout, BZT52C18LP-7 application, or BZT52C18LP-7 equivalent, key selection criteria include zener voltage accuracy at 5 mA test current, thermal resistance of 500 °C/W on FR-4, AEC-Q101 qualification, cathode-marked DFN1006-2 footprint, and reverse leakage ≤0.1 µA at 14.4 V.

Technical Context

This Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load or supply conditions. Its 18 V nominal zener voltage is specified at 5 mA test current, with temperature coefficient of +12.4 to +16.0 mV/°C and maximum zener impedance of 45 Ω at I_ZT, ensuring predictable regulation in temperature-sensitive analog references.

Designed for high-reliability automotive applications, it meets AEC-Q101 stress testing requirements and features NiPdAu-plated terminals for robust solderability. The DFN1006-2 package enables compact PCB layout while maintaining thermal performance up to 150 °C junction temperature.

Key Specifications

Pinout & Package

DFN1006-2 package with two terminals: anode and cathode. Cathode is marked by a dot on the top surface. The device uses a leadless, molded plastic case with NiPdAu-plated copper leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5245BS-7-F and BZX384-C18,115, BZT52C18LP-7 offers the smallest footprint (DFN1006-2), lowest thermal resistance among 18 V Zeners in this class, and AEC-Q101 qualification-making it optimal for space-constrained, automotive-grade designs requiring tight thermal management.

Availability

BZT52C18LP-7 is available at Aetrix Electronics and suitable for automotive body control units, industrial 4–20 mA transmitters, medical sensor front ends, and smart energy meter reference circuits requiring stable component supply and AEC-Q101 compliance.

Supply support for BZT52C18LP-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The BZT52CxxLP series belongs to Diodes' AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive and industrial applications demanding high reliability, small form factor, and stable voltage reference performance under thermal stress.

FAQ

What is the maximum reverse voltage (V_R) at which leakage current remains ≤0.1 µA?

The BZT52C18LP-7 exhibits ≤0.1 µA reverse leakage current at V_R = 14.4 V, as specified in the Electrical Characteristics table. This value is measured at T_A = 25 °C and defines the upper limit of applied reverse voltage before significant leakage begins, critical for low-power standby operation in battery-powered sensors.

Does the DFN1006-2 package require special stencil or reflow profile considerations?

Yes - the DFN1006-2 package uses a bottom-terminated, no-lead design requiring optimized stencil aperture (0.12 mm thickness, 0.35 × 0.25 mm opening) and reflow profile with peak temperature ≤260 °C for ≤10 seconds. Diodes' recommended pad layout (DS30506 Page 4) must be followed to ensure void-free solder joints and thermal reliability.

How does the +12.4 to +16.0 mV/°C temperature coefficient impact voltage reference accuracy?

This positive temperature coefficient means the zener voltage increases linearly with temperature. Over –40 to +125 °C, the total drift is approximately 2.0–2.6 V, requiring system-level compensation in precision references. It is not a limitation but a known, repeatable parameter used in calibration algorithms for automotive and industrial metrology applications.

Is the BZT52C18LP-7 suitable for use in life support equipment?

No - Diodes Incorporated explicitly states that its products are not authorized for use in life support devices or systems without express written approval. The BZT52C18LP-7 is qualified to AEC-Q101 but lacks the additional process controls, documentation, and certification required for life support applications per ISO 13485 or FDA guidance.