Diodes Incorporated BZT52C4V3S-7

Overview

BZT52C4V3S-7 from Diodes Incorporated is a surface-mount Zener diode with nominal 4.3 V zener voltage (±0.3 V tolerance), 200 mW power dissipation, and SOD323 package. It provides precise voltage regulation in low-power biasing, reference, and overvoltage protection circuits, commonly used in automotive sensor interfaces and industrial power supply feedback loops.

For engineers reviewing the BZT52C4V3S-7 datasheet, BZT52C4V3S-7 pinout, BZT52C4V3S-7 application, or BZT52C4V3S-7 equivalent, key selection criteria include zener voltage tolerance (±0.3 V), dynamic impedance (90 Ω @ 5 mA), reverse leakage (3 µA @ 1 V), temperature coefficient (−3.5 to 0 mV/°C), and AEC-Q101 qualification for automotive reliability.

Technical Context

This Zener diode operates in reverse breakdown mode with a specified test current of 5 mA and exhibits a typical zener impedance of 90 Ω at that current. Its thermal resistance (625 °C/W) and power derating curve require careful PCB layout per Diodes' recommended SOD323 pad dimensions to maintain junction temperature within −65 °C to +150 °C limits.

The device features planar die construction, cathode band polarity marking, and matte tin–plated alloy 42 leadframe for solderability. It is fully RoHS-compliant, halogen- and antimony-free ("Green"), and qualified to AEC-Q101 for high-reliability automotive applications.

Key Specifications

Pinout & Package

Package: SOD323 - surface-mount plastic case with cathode band marking; dimensions: 1.30 mm (D) × 1.70 mm (E) × 0.30 mm (L); weight ≈ 0.0049 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4V3T1G and BZX384-C4V3, BZT52C4V3S-7 offers the optimal balance of AEC-Q101 qualification, SOD323 size, and 200 mW capability - making it the preferred choice for space-constrained automotive and industrial modules requiring certified reliability.

Availability

BZT52C4V3S-7 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial power supply feedback networks, USB port protection, and IoT node voltage clamping requiring stable component supply and long-term lifecycle support.

Supply support for BZT52C4V3S-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, manufacturing, and sales operations across Asia, Europe, and North America.

The BZT52C series belongs to Diodes' automotive-qualified Zener diode product line, engineered specifically for precision voltage reference and overvoltage protection in harsh-environment applications such as engine control, ADAS, and industrial automation.

FAQ

What is the maximum reverse voltage (V_R) at which leakage remains ≤3 µA?

The BZT52C4V3S-7 specifies 3 µA maximum reverse current at V_R = 1 V. At V_R = 4.0 V (just below nominal V_Z), leakage rises to ≤10 µA per characterization curves in DS30093 Rev. 20–2. Operation above 4.0 V enters the knee region and is not guaranteed for low-leakage behavior.

Is the SOD323 package compatible with standard reflow profiles for lead-free soldering?

Yes - the device uses matte tin–plated alloy 42 leads and is rated for JEDEC J-STD-020 Level 1 moisture sensitivity. It supports peak reflow temperatures up to 260 °C for ≤10 seconds, matching IPC/JEDEC Class 3 profiles without preconditioning or baking.

How does the −3.5 to 0 mV/°C temperature coefficient affect regulation accuracy over −40 °C to +125 °C?

Over that range, total V_Z drift is ≤0.57 V (0.57 mV/°C × 165 °C span), or ±6.7% of nominal 4.3 V. In practice, typical units show <±2% drift due to centering within the TC range and statistical distribution - verified in AEC-Q101 thermal testing.

Can BZT52C4V3S-7 replace BZT52C4V7S in a 4.7 V reference circuit?

No - the 4.3 V and 4.7 V variants have non-overlapping zener voltage ranges (4.0–4.6 V vs. 4.4–5.0 V). Substituting would cause ≥0.1 V systematic error in reference level, violating typical 1% tolerance requirements for feedback circuits and risking regulator instability.