Diodes Incorporated BZT52C3V3S-7-F

Overview

BZT52C3V3S-7-F from Diodes Incorporated is a surface-mount Zener diode with a nominal zener voltage of 3.3 V, ±6% tolerance (3.1–3.5 V), 5 mA test current, and 95 Ω maximum zener impedance at 1 kHz. It delivers 200 mW power dissipation in the SOD323 package and is AEC-Q101 qualified for automotive-grade reliability in voltage regulation and overvoltage protection circuits.

For engineers reviewing the BZT52C3V3S-7-F datasheet, BZT52C3V3S-7-F pinout, BZT52C3V3S-7-F application, or BZT52C3V3S-7-F equivalent, key selection criteria include zener voltage accuracy, low dynamic impedance, thermal resistance (625 °C/W), cathode-band polarity marking, and compatibility with automated SMT assembly on FR-4 PCBs.

Technical Context

This device operates as a precision shunt voltage regulator, maintaining stable reference voltage across load variations by conducting reverse current above its breakdown threshold. Its planar die construction ensures consistent avalanche characteristics, while the SOD323 package enables high-density board layout and thermal performance suitable for space-constrained consumer and automotive modules.

The diode exhibits a temperature coefficient of –3.5 mV/°C near 3.3 V, enabling predictable drift compensation in bias networks. With only 5 µA maximum reverse leakage at 1.0 V and 5 µA reverse current at rated VR, it supports low-power sensing and standby-mode protection without significant quiescent drain.

Key Specifications

Pinout & Package

The SOD323 package features two terminals in a gull-wing surface-mount configuration. Polarity is indicated by a cathode band on the top surface, aligned with Terminal 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5226BS-7-F and BZX384-C3V3, the BZT52C3V3S-7-F uniquely balances automotive qualification, compact SOD323 size, and tight 3.1–3.5 V tolerance-making it optimal for safety-critical, space-constrained 3.3 V regulation where reliability and footprint are co-prioritized.

Availability

BZT52C3V3S-7-F is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and USB-powered peripheral devices requiring stable component supply and long-term lifecycle support.

Supply support for BZT52C3V3S-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

The BZT52C series belongs to Diodes' precision Zener portfolio, engineered specifically for high-reliability voltage reference and transient suppression in automotive and industrial applications where AEC-Q101 compliance and tight parametric control are mandatory.

FAQ

What is the maximum reverse current at 1.0 V for BZT52C3V3S-7-F?

The maximum reverse current (I_R) is 5 µA at V_R = 1.0 V, measured at T_A = +25°C. This low leakage ensures minimal loading on high-impedance bias networks and preserves battery life in always-on circuits such as real-time clock supervisors or wake-up comparators.

Is BZT52C3V3S-7-F suitable for reflow soldering per J-STD-020?

Yes - it is rated Moisture Sensitivity Level 1 (MSL-1), meaning it can be stored indefinitely at ≤30°C/85% RH and subjected to standard Pb-free reflow profiles (peak 260°C) without baking. The matte tin finish ensures robust solder joint formation per MIL-STD-202, Method 208.

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

With a specified TC of –3.5 mV/°C, the zener voltage shifts approximately –58 mV across the full range. At 125°C, V_Z ≈ 3.24 V (3.3 V – 0.058 V), remaining within the 3.1–3.5 V specification band - enabling stable operation without external compensation in most non-precision applications.

Can BZT52C3V3S-7-F replace BZT52C3V0S-7-F in a 3.3 V rail clamp design?

No - BZT52C3V0S-7-F has a nominal 3.0 V rating (2.8–3.2 V range), while BZT52C3V3S-7-F is 3.3 V (3.1–3.5 V). Substituting introduces a 0.3 V higher clamping threshold, risking overvoltage exposure to downstream 3.3 V logic. Always verify system margin against the actual V_Z min/max bounds before interchange.