Diodes Incorporated BZX84C33W-7-F

Overview

BZX84C33W-7-F from Diodes Incorporated is a 33 V, 200 mW surface-mount Zener diode in SOT-323 package, with nominal Zener voltage 33.0 V (min 31.0 V, max 35.0 V) at 2.0 mA test current, 80 Ω maximum Zener impedance at 2.0 mA, and 0.1 µA maximum reverse leakage at 23.1 V, used for precision voltage regulation and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84C33W-7-F datasheet, BZX84C33W-7-F pinout, BZX84C33W-7-F application, or BZX84C33W-7-F equivalent, key selection criteria include Zener voltage tolerance (±3.0%), thermal resistance (625 K/W), ultra-small SOT-323 footprint, RoHS-compliant matte tin plating, and temperature coefficient (+27.4 to +33.4 mV/°C) for stable reference performance across industrial temperature range.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent Zener characteristics, while the SOT-323 package enables high-density PCB layouts in space-constrained applications.

It delivers 33 V regulation with ±3.0% initial tolerance, exhibits a positive temperature coefficient (+27.4 to +33.4 mV/°C), and maintains low dynamic impedance (80 Ω at 2.0 mA) for minimal output voltage variation under current transients.

Key Specifications

Pinout & Package

SOT-323 plastic surface-mount package with three terminals: anode, cathode, and case (cathode marked by band). Dimensions: 2.20 × 1.35 × 0.90 mm (L × W × H), weight ≈ 0.006 g, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBZ5262B-7-F and BZX84-C33, BZX84C33W-7-F offers superior thermal performance (625 vs. 833 K/W), smaller SOT-323 footprint, and guaranteed RoHS/green compliance-making it optimal for space- and compliance-sensitive industrial and portable designs.

Availability

BZX84C33W-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, low-power IoT reference generation, and automotive BCM wake-up circuits requiring stable component supply and full RoHS compliance.

Supply support for BZX84C33W-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, serving industrial, computing, consumer, and communications markets with high-reliability components.

The BZX84 series belongs to Diodes' general-purpose Zener diode product line, designed specifically for compact, cost-effective voltage regulation and transient suppression in surface-mount applications across commercial and industrial environments.

FAQ

What is the maximum reverse voltage this Zener can withstand before breakdown?

The BZX84C33W-7-F has a nominal Zener voltage of 33.0 V with a guaranteed range of 31.0 V to 35.0 V at 2.0 mA test current. It begins controlled reverse breakdown within this range and is rated for continuous operation up to its 200 mW power limit. The absolute maximum non-destructive reverse voltage is not specified beyond the Zener range, and operation above 35.0 V risks exceeding power dissipation limits.

Does this part have a specified capacitance value?

No specific capacitance value is provided for BZX84C33W-7-F in the datasheet. However, Figure 4 shows typical total capacitance versus nominal Zener voltage: for 33 V devices, capacitance is approximately 15 pF at V_R = 1 V and decreases further at higher reverse bias. This low parasitic capacitance supports use in high-frequency voltage reference and ESD-clamping roles.

Can this Zener be used in series or parallel configurations?

Series connection is permissible to achieve higher reference voltages, but requires matched units to avoid current imbalance due to Zener voltage tolerance. Parallel connection is not recommended-minor V_Z mismatches cause current hogging and thermal runaway. For higher power, use a single higher-rated Zener or add a series ballast resistor to stabilize current sharing.

Is the SOT-323 package compatible with standard reflow soldering profiles?

Yes-the SOT-323 package uses matte tin lead finish and is qualified for Pb-free reflow soldering per J-STD-020D Level 1 moisture sensitivity. Recommended peak temperature is ≤260°C, with ramp rates and dwell times aligned to IPC/JEDEC J-STD-020. No pre-bake is required due to its Level 1 classification.