Diodes Incorporated BZT52C3V0S-7

Overview

BZT52C3V0S-7 from Diodes Incorporated is a surface-mount Zener diode with nominal 3.0 V zener voltage (2.8–3.2 V range), 200 mW power dissipation, and 95 Ω maximum zener impedance at 5 mA test current, designed for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the BZT52C3V0S-7 datasheet, BZT52C3V0S-7 pinout, BZT52C3V0S-7 application, or BZT52C3V0S-7 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (625 °C/W), reverse leakage (≤10 µA at 1.0 V), cathode-band polarity marking, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This device operates as a two-terminal voltage reference using planar silicon junction technology, maintaining stable reverse breakdown across -65 °C to +150 °C ambient temperature. Its 3.0 V nominal zener voltage exhibits a temperature coefficient of -3.5 mV/°C, enabling predictable drift compensation in bias networks.

The SOD323 package supports automated pick-and-place assembly and delivers 200 mW power handling under FR-4 board conditions with recommended pad layout. Thermal resistance of 625 °C/W reflects its small die size and plastic encapsulation, requiring derating above +25 °C per Figure 1.

Key Specifications

Pinout & Package

Package: SOD323 - ultra-compact surface-mount plastic case (1.30 mm × 1.70 mm × 0.95 mm), matte tin-plated alloy 42 leadframe, cathode band marking on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ3V0T1G and BZX384-C3V0, BZT52C3V0S-7 offers optimal balance of AEC-Q101 qualification, industry-standard SOD323 size, and 200 mW/95 Ω performance-making it ideal for space-constrained automotive and industrial designs where reliability and footprint are prioritized over ultra-low impedance or extended power headroom.

Availability

BZT52C3V0S-7 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial analog reference generation, and USB port overvoltage clamping requiring stable component supply and full traceability.

Supply support for BZT52C3V0S-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 BZT52 series belongs to Diodes' standard Zener diode product line, engineered for cost-effective, high-reliability voltage regulation in consumer, industrial, and automotive applications where compact size and AEC-Q101 compliance are essential.

FAQ

What is the cathode identification method for BZT52C3V0S-7?

The cathode is identified by a distinct black band printed on the top surface of the SOD323 package, aligned with the cathode terminal. This marking follows JEDEC standard orientation: when the band is left-aligned in top-view, the left pad is cathode and right pad is anode. Polarity must be verified before PCB layout to avoid reverse-bias failure.

Does BZT52C3V0S-7 support reflow soldering per J-STD-020?

Yes, BZT52C3V0S-7 is rated for Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30 °C/60% RH and subjected to standard Pb-free reflow profiles (peak 260 °C) without baking. Its matte tin finish ensures reliable wetting and intermetallic formation during Type 3 or Type 4 solder paste processes.

How does temperature affect the 3.0 V zener voltage in practical operation?

The BZT52C3V0S-7 has a temperature coefficient of -3.5 mV/°C, meaning its zener voltage decreases by approximately 3.5 mV per degree Celsius rise above 25 °C. At +105 °C, the voltage drops ~280 mV (to ~2.72 V), which is accounted for in automotive bias networks via complementary transistor compensation or calibration algorithms.

Can BZT52C3V0S-7 replace a 3.3 V Zener in existing designs?

No-BZT52C3V0S-7 is specified at 3.0 V (2.8–3.2 V), while BZT52C3V3S-7 is the 3.3 V variant (3.1–3.5 V). Substituting without circuit recalibration risks undershoot in regulation or excessive current in clamp applications. The 0.3 V difference exceeds typical tolerance margins in precision references and may violate downstream IC input thresholds.