Diodes Incorporated BZT52C15-7

Overview

BZT52C15-7 from Diodes Incorporated is a surface-mount 15V Zener diode in SOD123 package, rated for 500mW power dissipation at TL=+75°C and 370mW at TA=+25°C, with ±5% tolerance (13.8–15.6V), 30Ω max Zener impedance at 5mA, and 0.1µA max reverse leakage at 12V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power supply feedback circuits.

For engineers reviewing the BZT52C15-7 datasheet, BZT52C15-7 pinout, BZT52C15-7 application, or BZT52C15-7 equivalent, key selection criteria include its 15V nominal Zener voltage, SOD123 footprint compatibility, thermal resistance (RθJA = 338°C/W), AEC-Q101 qualification, and tight 5% voltage tolerance under standard test conditions.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals when biased above its specified Zener voltage. Its planar die construction ensures consistent breakdown characteristics and low leakage, while the matte tin-plated Alloy 42 leadframe guarantees reliable solderability per MIL-STD-202.

The device exhibits a positive temperature coefficient of +10.5mV/°C at IZTC = 5mA, enabling predictable voltage drift compensation in temperature-sensitive references. Its 15Ω typical Zener impedance at 5mA supports stable regulation under moderate load transients in linear regulator feedback paths and sensor bias networks.

Key Specifications

Pinout & Package

Two-terminal device in SOD123 plastic package with cathode band marking. Terminals are anode (unmarked end) and cathode (band end). Polarity must be observed during PCB layout to ensure correct reverse-bias operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ5245B-7-F and BZX84-C15, BZT52C15-7 offers superior thermal performance (RθJA = 338°C/W), AEC-Q101 qualification for automotive use, and tighter process control via planar die construction-making it optimal for high-reliability industrial and automotive voltage reference roles.

Availability

BZT52C15-7 is available at Aetrix Electronics and suitable for USB power protection, industrial sensor biasing, DC-DC feedback divider, and low-power microcontroller reset applications requiring stable component supply and long-term manufacturability.

Supply support for BZT52C15-7 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

The BZT52 series belongs to Diodes' general-purpose Zener diode product line, engineered for medium-current voltage regulation and clamping in cost-sensitive, high-volume applications such as power supplies, consumer electronics, and automotive subsystems.

FAQ

What is the maximum reverse voltage (VR) at which BZT52C15-7 guarantees IR ≤ 0.1µA?

The datasheet specifies that reverse leakage current IR is ≤0.1µA at VR = 12V, which is 80% of the nominal 15V Zener voltage. This condition is tested at TA = +25°C and defines the upper limit of safe non-breakdown operation before significant conduction begins.

Can BZT52C15-7 be used in place of a 1N4744A in a through-hole design?

No - BZT52C15-7 is a surface-mount SOD123 device with different thermal characteristics (RθJA = 338°C/W vs 1N4744A's ~100°C/W), lower power rating (370mW vs 1W), and distinct package geometry. Direct substitution requires PCB redesign, thermal analysis, and derating verification for the same operating conditions.

Does BZT52C15-7 have a specified Zener knee current (IZK) and corresponding voltage (VZK)?

Yes - the datasheet lists IZK = 1.0mA and VZK = 13.0V (min) at TJ = +25°C. This defines the lowest practical operating current where the Zener exhibits usable regulation, critical for low-power bias networks where current is constrained below 5mA test conditions.

Is the SOD123 package of BZT52C15-7 compatible with IPC-7351B standard land patterns?

Yes - the SOD123 outline dimensions (E = 2.55–2.85mm, D = 1.40–1.70mm, L = 0.25–0.40mm) align with IPC-7351B "SOD-123" generic footprint. Recommended pad layout (X = 0.900mm, X1 = 4.050mm, Y = 0.950mm) matches IPC-7351B Class B (density level) for robust solder joint formation and automated assembly yield.