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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Diodes Incorporated BZX84B33Q-7-F

Name: BZX84B33Q-7-F
Brand: Diodes Incorporated
SKU: BZX84B33Q-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84B33Q-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BZX84B33Q-7-F.pdf

Description:: DIODE ZENER 33V 300MW SOT23

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Inventory:8,146

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Product details

Overview

BZX84B33Q-7-F from Diodes Incorporated is an AEC-Q101 qualified surface-mount precision Zener diode with nominal 33 V zener voltage (32.3–33.7 V range), ±2% tolerance, 350 mW power dissipation, and SOT23 package. It regulates voltage in automotive power supply rails, ECU reference circuits, and sensor bias networks where stable clamping under transient conditions is required.

For engineers reviewing the BZX84B33Q-7-F datasheet, BZX84B33Q-7-F pinout, BZX84B33Q-7-F application, or BZX84B33Q-7-F equivalent, key selection criteria include zener voltage accuracy at 2 mA test current, low dynamic impedance (80 Ω at 2 mA), temperature coefficient (+27.4 mV/°C), and automotive-grade reliability per AEC-Q101.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals. Its 33 V nominal rating is specified at I_ZT = 2 mA, with a maximum zener impedance of 325 Ω at I_ZK = 0.5 mA and 80 Ω at I_ZT, ensuring predictable regulation under varying load and temperature.

The device exhibits a positive temperature coefficient of +27.4 mV/°C, enabling predictable drift compensation in multi-device reference stacks. Its SOT23 package supports automated placement and provides thermal resistance of 357 °C/W (junction-to-ambient, free-air), suitable for low-power board-level voltage clamping.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	33 V nominal, 32.3–33.7 V range at I_Z = 2 mA - defines precise clamping threshold for overvoltage protection
Power Dissipation	350 mW - maximum continuous power handling at ambient temperature, limiting usable current in regulation circuits
Zener Impedance	80 Ω at I_ZT = 2 mA - determines output voltage variation under load changes
Reverse Leakage Current	0.1 µA at V_R = 23.1 V - ensures minimal quiescent current in standby-biased reference paths
Temperature Coefficient	+27.4 mV/°C - quantifies voltage drift per degree Celsius, critical for temperature-stable references
Package	SOT23 - 3-pin surface-mount outline compatible with standard pick-and-place and reflow processes
AEC-Q101 Qualified	Yes - validated for automotive applications including engine control units and body electronics

Pinout & Package

Package: SOT23 - compact 3-terminal plastic-molded case with matte tin-plated alloy 42 leadframe; moisture sensitivity level 1 per J-STD-020; weight ≈ 0.008 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward conduction terminal / cathode reference ground	Connected to system ground or lower-potential node when used in reverse-bias regulation
Cathode (Pin 2)	Zener breakdown terminal / regulated output	Provides stable 33 V reference relative to anode; carries full zener current during regulation
No-connect (Pin 3)	Internal die attachment pad	Electrically isolated; serves mechanical anchoring function only - must not be connected in circuit

Key Features

Feature	Design Value
±2% Zener voltage tolerance	Enables tight regulation without post-production trimming in cost-sensitive automotive modules
AEC-Q101 qualification	Validates reliability for under-hood environments including thermal cycling, humidity, and vibration stress
Lead-free & halogen-free "Green" construction	Meets RoHS 3 (2015/863/EU) and automotive ELV directive requirements for end-of-life recyclability
Low 0.1 µA leakage at 70% V_Z	Minimizes standby power loss in always-on vehicle subsystems such as CAN wake-up receivers
SOT23 footprint compatibility	Allows drop-in replacement of legacy Zeners (e.g., BZX84-C33) without PCB redesign

Applications

Automotive Engine Control Unit (ECU)

Industrial Sensor Signal Conditioning

Use Scenario: Stabilizing 5 V or 3.3 V reference for microcontroller ADC inputs in high-temperature engine bay environments.

IC Role / Device Role / Timing Role: Precision voltage clamp providing stable bias point for analog front-end circuitry.

Use Value: Maintains <±1% reference accuracy over −40°C to +125°C due to AEC-Q101 validation and predictable +27.4 mV/°C TC.

Use Scenario: Protecting 4–20 mA transmitter outputs from transients induced by motor drives or relay switching.

IC Role / Device Role / Timing Role: Overvoltage shunt element absorbing surge energy before it reaches sensitive DAC or op-amp stages.

Use Value: Clamps excursions above 36 V (33 V + 10% tolerance margin) with sub-µA leakage below operating voltage.

Consumer Power Adapter Feedback Loop

Medical Diagnostic Equipment Reference

Use Scenario: Secondary-side voltage sensing in isolated flyback converters powering USB-C PD accessories.

IC Role / Device Role / Timing Role: Zener-based feedback node setting output voltage via optocoupler bias current.

Use Value: Delivers stable 33 V reference with 80 Ω dynamic impedance, minimizing output ripple under line/load transients.

Use Scenario: Generating calibrated bias voltages for photodiode amplifiers in portable blood oximeters.

IC Role / Device Role / Timing Role: Low-noise voltage reference source for precision current-to-voltage conversion.

Use Value: Provides <0.1 µA leakage at 23.1 V, reducing input offset error in high-gain transimpedance amplifiers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5262B-7-F	33 V nominal, ±5% tolerance, 350 mW, SOT23 - wider voltage tolerance, no AEC-Q101 qualification	Acceptable for commercial-grade power supplies but unsuitable for automotive ECU designs requiring AEC compliance	Select when cost is prioritized over automotive qualification and tighter voltage tolerance is not required
BZX84-C33-7-F	33 V nominal, ±5% tolerance, 300 mW, SOT23 - lower power rating, non-automotive grade, same footprint	Limited to ambient-temperature consumer electronics; derates to 200 mW above 70°C vs. 350 mW for BZX84B33Q-7-F	Choose for legacy designs needing footprint compatibility but lacking AEC-Q101 or ±2% requirements

Compared with MMBZ5262B-7-F and BZX84-C33-7-F, BZX84B33Q-7-F delivers tighter voltage control, higher thermal stability, and automotive qualification - making it the sole choice for safety-critical voltage references in modern ECU and ADAS subsystems.

Availability

BZX84B33Q-7-F is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor signal conditioning, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for BZX84B33Q-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 BZX84B series belongs to Diodes' precision Zener diode product line, engineered specifically for automotive and industrial applications demanding high reliability, tight voltage tolerance, and robust thermal performance in compact SOT23 packages.

FAQ

What is the maximum continuous zener current for BZX84B33Q-7-F at 25°C?

The maximum continuous zener current is calculated from P_D = 350 mW and V_Z = 33 V, yielding I_Z(max) ≈ 10.6 mA. This assumes ideal heat sinking; actual usable current decreases with rising ambient temperature per the derating curve in Figure 1.

Does BZX84B33Q-7-F have a built-in capacitor or ESD protection?

No. BZX84B33Q-7-F is a single-junction silicon Zener diode with no integrated capacitance or ESD structure. Its typical total capacitance is 15 pF at V_R = 1 V (per Figure 4), and it relies on external TVS devices for robust ESD immunity in system-level designs.

Can BZX84B33Q-7-F replace BZX84-C33 in existing PCB layouts?

Yes - both use identical SOT23 footprints and pinout (anode/cathode/no-connect). However, BZX84B33Q-7-F offers ±2% tolerance versus ±5% for BZX84-C33, higher power (350 mW vs. 300 mW), and AEC-Q101 qualification, enabling direct substitution with improved performance.

What is the meaning of the 'Q' suffix in BZX84B33Q-7-F?

The 'Q' denotes AEC-Q101 qualification per Diodes Incorporated's ordering nomenclature. It distinguishes the automotive-grade version from the standard BZX84B33-7-F, confirming validation for temperature cycling, humidity resistance, and mechanical shock per AEC stress test requirements.

BZX84B33Q-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 33 V

Tolerance:: ±2%

Power - Max:: 300 mW

Impedance (Max) (Zzt):: 80 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 23.1 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

BZX84B33Q-7-F FAQ

1.How can I place an order for BZX84B33Q-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84B33Q-7-F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BZX84B33Q-7-F reliable?

The price and inventory of BZX84B33Q-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B33Q-7-F is usually 5 days.

3.What payment methods are accepted for BZX84B33Q-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B33Q-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84B33Q-7-F?

BZX84B33Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84B33Q-7-F order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BZX84B33Q-7-F?

For technical support, including BZX84B33Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B33Q-7-F requirements.

6.How does Aetrix verify that BZX84B33Q-7-F is sourced from the original manufacturer or authorized distributors?

All BZX84B33Q-7-F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BZX84B33Q-7-F meets industry standards.

7.What is the process for return or replacement of BZX84B33Q-7-F?

All BZX84B33Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B33Q-7-F, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BZX84B33Q-7-F part is unused and in its original packaging.

Return procedure for BZX84B33Q-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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