Diodes Incorporated BZT52C4V7TQ-7-F

Overview

BZT52C4V7TQ-7-F from Diodes Incorporated is an automotive-grade surface-mount Zener diode with a nominal zener voltage of 4.7 V, ±5% tolerance (4.4–5.0 V), 300 mW power dissipation, and SOD523 package. It provides precise voltage regulation in low-power biasing, overvoltage protection, and reference applications for automotive control modules, sensor signal conditioning, and power supply monitoring circuits.

For engineers reviewing the BZT52C4V7TQ-7-F datasheet, BZT52C4V7TQ-7-F pinout, BZT52C4V7TQ-7-F application, or BZT52C4V7TQ-7-F equivalent, key selection criteria include zener voltage accuracy at 5 mA test current, low dynamic impedance (80 Ω @ 1 kHz), temperature coefficient (–3.5 to 0.2 mV/°C), reverse leakage (3.0 µA @ 2.0 V), and AEC-Q101 qualification for automotive reliability.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its design centers on tight voltage regulation at I_ZT = 5 mA, with low zener impedance (80 Ω) ensuring minimal output variation during transient current changes.

The device uses a planar epitaxial construction in a molded SOD523 package with matte tin–annealed alloy 42 leads, enabling high thermal efficiency (R_θJA = 417 °C/W on FR-4) and compatibility with lead-free reflow processes. It is rated for operation from –65 °C to +150 °C and qualified to AEC-Q101 for automotive use.

Key Specifications

Pinout & Package

The BZT52C4V7TQ-7-F is a two-terminal device in the SOD523 package. The cathode is marked by a band on the top surface; the anode is unmarked. Terminals are matte tin–annealed alloy 42 leads, solderable per MIL-STD-202, Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4705T1G and BZX384-C4V7,115, the BZT52C4V7TQ-7-F offers optimal balance of automotive qualification, minimal SOD523 footprint, and lowest zener impedance (80 Ω), making it preferred for space-constrained, high-precision automotive voltage reference designs.

Availability

BZT52C4V7TQ-7-F is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera modules requiring stable component supply with full AEC-Q101 traceability and PPAP documentation support.

Supply support for BZT52C4V7TQ-7-F 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, specializing in high-reliability components for automotive, industrial, and consumer markets.

The BZT52C series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for voltage regulation, clamping, and reference functions in harsh-environment electronic control units.

FAQ

What is the maximum reverse voltage (V_R) at which leakage remains ≤3.0 µA?

The BZT52C4V7TQ-7-F exhibits ≤3.0 µA reverse leakage at V_R = 2.0 V, as specified in the Electrical Characteristics table. At V_R = 4.0 V, leakage rises to approximately 15 µA per typical curves (Fig. 5), confirming its suitability only for clamping or regulation near its 4.7 V zener point.

Is the SOD523 package compatible with standard reflow profiles for lead-free assembly?

Yes - the device uses matte tin–annealed alloy 42 leads and is rated for Pb-free reflow per JEDEC J-STD-020. Its moisture sensitivity level is 1, eliminating bake requirements. Peak reflow temperature up to 260 °C is supported without degradation.

How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?

With a temperature coefficient ranging from –3.5 to +0.2 mV/°C, the worst-case drift over 165 °C span is ±578 µV/°C × 165 °C ≈ ±95 mV. Combined with initial ±0.3 V tolerance, total regulation uncertainty remains within ±120 mV - sufficient for non-critical biasing and clamping.

Can this Zener diode replace a 5.1 V part in a 5 V rail clamp circuit?

No - the BZT52C4V7TQ-7-F has a nominal 4.7 V rating (4.4–5.0 V range). Using it on a 5 V rail risks premature conduction and excessive power dissipation. For 5 V clamping, BZT52C5V1TQ-7-F (5.1 V, 4.8–5.4 V) is the appropriate AEC-Q101–qualified alternative.