Diodes Incorporated BZX84C33S-7-F

Overview

BZX84C33S-7-F from Diodes Incorporated is a dual 200 mW surface-mount Zener diode in SOT-363 package, rated for 33 V nominal Zener voltage (31.0–35.0 V range at 2 mA), with 80 Ω maximum Zener impedance at test current and ±0.1 µA maximum reverse leakage at 23.1 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.

For engineers reviewing the BZX84C33S-7-F datasheet, BZX84C33S-7-F pinout, BZX84C33S-7-F application, or BZX84C33S-7-F equivalent, key selection criteria include its 33 V regulation tolerance, ultra-small SOT-363 footprint, 200 mW power dissipation limit, temperature coefficient of +27.4 to +33.4 mV/°C, and dual-diode configuration enabling bidirectional clamping or dual-rail referencing.

Technical Context

This device integrates two independent Zener diodes in a single SOT-363 package, sharing no internal connection-each diode operates as a discrete 33 V regulator with separate anode/cathode terminals. Its planar die construction ensures stable breakdown characteristics and low thermal resistance (625 °C/W junction-to-ambient).

The Zener voltage is specified at 2 mA test current (IZK = 0.5 mA, IZT = 2.0 mA), with typical capacitance of ~10 pF at 1 MHz and VR = 1 V. It exhibits a positive temperature coefficient (+27.4 to +33.4 mV/°C), making it suitable for temperature-compensated reference designs when paired with negative-TC components.

Key Specifications

Pinout & Package

SOT-363 package: 6-pin, dual-row, surface-mount plastic case (UL 94V-0), 0.006 g weight, moisture sensitivity level 1. Pin numbering follows standard top-view orientation with NC–C1–A1–A2–C2–NC sequence.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5265BS-7-F and BZX84C33LT1G, BZX84C33S-7-F uniquely delivers two independent 33 V Zeners in one SOT-363 package-reducing component count, interconnect inductance, and layout complexity in dual-rail or redundancy-critical designs.

Availability

BZX84C33S-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and automotive cabin control panel designs requiring stable component supply and long-term lifecycle support.

Supply support for BZX84C33S-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 and manufacturing operations across Asia and the Americas.

This device belongs to the BZX84C series of surface-mount Zener diodes, engineered specifically for compact, high-reliability voltage regulation and transient suppression in space-constrained consumer, industrial, and automotive electronics.

FAQ

What is the maximum continuous Zener current for BZX84C33S-7-F at 25°C?

The absolute maximum DC current is derived from power dissipation: 200 mW ÷ 33 V ≈ 6.06 mA. However, the datasheet specifies test conditions at 2.0 mA (IZT) and 0.5 mA (IZK); sustained operation above 5 mA risks exceeding thermal limits on standard FR4 layouts without enhanced copper pour.

Can BZX84C33S-7-F be used for bidirectional ESD protection on a single signal line?

No - each diode is unidirectional (anode-to-cathode). To achieve bidirectional clamping on one line, external series connection (e.g., back-to-back configuration using both diodes) is required. The device does not integrate a true bidirectional TVS structure.

Is the SOT-363 package lead-free and RoHS compliant?

Yes - the device uses matte tin plating over Alloy 42 leadframe and complies with RoHS Directive 2011/65/EU. Diodes Incorporated confirms "no purposefully added lead" and classifies it as a "Green" device per their published policy, with halogen-free molding compound for date codes UO (2007 week 40) and newer.

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

With a coefficient of +27.4 to +33.4 mV/°C, the Zener voltage increases by ~5.5–6.7 V across this 165°C span. For precision references, this drift must be compensated - e.g., by pairing with a negative-TC component or using closed-loop calibration in the host system firmware.