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Diodes Incorporated BZX84C33-7
- Part No.:
- BZX84C33-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C33-7.pdf
- Description:
- DIODE ZENER 33V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,277
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Product details
Overview
BZX84C33-7 from Diodes Incorporated is a 33V, 2mA nominal Zener diode in SOT23 package, rated for 350mW power dissipation at ambient temperature, with 325Ω maximum Zener impedance at test current and ±10% voltage tolerance (31.0–35.0V). It provides precision voltage regulation in low-power biasing and reference circuits, commonly used in power supply feedback loops and overvoltage protection for microcontroller I/O pins.
For engineers reviewing the BZX84C33-7 datasheet, BZX84C33-7 pinout, BZX84C33-7 application, or BZX84C33-7 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at 2mA, thermal resistance (357°C/W), reverse leakage (<0.1µA at 27.4V), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its planar die construction ensures consistent breakdown characteristics and low leakage, while the SOT23 package enables high-density PCB layouts and compatibility with automated pick-and-place assembly.
The device exhibits a negative temperature coefficient of −3.5mV/°C near 33V, enabling predictable drift compensation in temperature-sensitive references. Its 0.5mA knee current and 325Ω dynamic impedance at 2mA support accurate regulation in low-current analog monitoring paths without significant voltage droop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33V nominal, 31.0–35.0V range at 2mA - defines stable regulation point for feedback or clamping |
| Power Dissipation (PD) | 350mW at TA = 25°C - sets max continuous power before thermal derating begins |
| Zener Impedance (ZZT) | 325Ω max at IZT = 2mA - determines output voltage stability under small-signal load variation |
| Reverse Leakage (IR) | <0.1µA at VR = 27.4V - ensures minimal quiescent current in standby or high-impedance sensing nodes |
| Thermal Resistance (RθJA) | 357°C/W - quantifies junction-to-ambient heat rise per watt, critical for layout thermal design |
| Temperature Coefficient | −3.5mV/°C - enables predictable voltage drift correction in compensated reference designs |
Pinout & Package
Package: SOT23 - surface-mount, 3-terminal plastic package with matte tin-plated alloy 42 leadframe; UL 94V-0 rated; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground or lower-potential node in reverse-biased regulation configuration |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 33V reference when reverse biased; connects to feedback divider or clamp point |
| No-Connect (Pin 3) | Internal die attach pad / mechanical support | Not electrically connected; serves as thermal path and mechanical anchor-must be left floating or thermally tied to copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight Zener voltage distribution and repeatable breakdown behavior across production lots |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control modules and body electronics |
| Lead-free & halogen-free "Green" molding compound | Meets RoHS 3 and automotive environmental compliance without compromising thermal or electrical performance |
| Low 0.008g weight and SOT23 footprint | Supports miniaturized PCB designs and reduces board-level inertia in vibration-prone environments |
Applications
| Power Supply Feedback Reference | Microcontroller I/O Clamp Protection |
|---|---|
Use Scenario: Used in the optocoupler feedback network of isolated DC-DC converters to regulate output voltage within ±1%. IC Role / Device Role: Zener diode establishes precise 33V reference for TL431 or optocoupler anode biasing. Use Value: Tight 31.0–35.0V tolerance and low 325Ω impedance minimize regulation error across line/load variations. | Use Scenario: Placed between MCU GPIO pin and VDD to limit transient overvoltage during ESD events or hot-plug insertion. IC Role / Device Role: Acts as bidirectional shunt clamp, conducting above 33V to divert surge energy away from sensitive input structures. Use Value: Sub-0.1µA leakage at 27.4V preserves low-power sleep current; fast response prevents latch-up in 3.3V/5V I/O domains. |
| Automotive Sensor Biasing | Industrial Analog Signal Conditioning |
Use Scenario: Provides stable excitation voltage for resistive temperature detectors (RTDs) in engine coolant temperature sensors. IC Role / Device Role: Supplies regulated 33V bias to 1kΩ RTD bridge, enabling ratiometric measurement against ADC reference. Use Value: AEC-Q101 qualification ensures operation from −40°C to +125°C; −3.5mV/°C TC allows predictable calibration offset correction. | Use Scenario: Sets reference voltage for 12-bit SAR ADC input scaling in programmable logic controller (PLC) analog input modules. IC Role / Device Role: Generates clean, low-noise 33V reference for resistor-divider attenuation of ±10V industrial signals. Use Value: 350mW rating supports continuous operation with 1mA bias current; SOT23 footprint eases layout near noise-sensitive analog traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5263BS-7-F | 33V nominal, 300mW rating, 700Ω ZZT at 3.5mA, no AEC-Q101 qualification | Limited to commercial-grade consumer products; higher impedance reduces regulation accuracy in precision feedback | Select when cost is primary constraint and automotive qualification is unnecessary |
| BZX84-C33,115 | Same 33V spec, 350mW, but in SOD-323 package (smaller footprint, higher RθJA = 417°C/W) | Higher thermal resistance limits power handling in compact layouts; less robust for reflow cycling | Choose only if board space is severely constrained and thermal margin exceeds 20°C |
Compared with MMBZ5263BS-7-F and BZX84-C33,115, the BZX84C33-7 delivers superior regulation stability (325Ω vs. 700Ω), guaranteed automotive reliability (AEC-Q101), and optimized thermal performance (357°C/W) in the industry-standard SOT23 package-making it the preferred choice for safety-critical and high-accuracy voltage reference roles.
Availability
BZX84C33-7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC analog input modules, and medical sensor biasing circuits requiring stable component supply and long-term lifecycle continuity.
Supply support for BZX84C33-7 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, specializing in high-reliability components for automotive, industrial, and computing markets.
The BZX84 series belongs to Diodes' precision Zener diode product line, engineered for stable voltage reference and overvoltage protection in space-constrained, thermally demanding applications where AEC-Q101 compliance and tight parametric control are essential.
FAQ
What is the maximum reverse voltage (VR) that ensures leakage remains below 0.1µA?
The BZX84C33-7 guarantees reverse leakage <0.1µA at VR = 27.4V, as specified in the Electrical Characteristics table. This value represents the maximum reverse voltage applied before entering the knee region of the Zener curve, ensuring ultra-low standby current in bias and protection circuits.
Can this Zener diode be used in parallel for higher power dissipation?
No-parallel connection is not recommended due to mismatched Zener voltage tolerances (±10%) and temperature coefficients, which cause current hogging and thermal runaway. For higher power, use a single higher-rated device like the 1.3W BZX85C33 or discrete transistor-based shunt regulator.
Is the SOT23 pinout compatible with standard Zener diode footprints?
Yes-the BZX84C33-7 uses standard SOT23 pinout: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC (die attach). It matches JEDEC TO-236AB and is compatible with common SOT23 land patterns defined in IPC-7351B, including Diodes Inc.'s recommended pad layout (X=0.8mm, Y=0.9mm).
Does the "-7" suffix indicate tape-and-reel packaging only, or does it affect electrical specs?
The "-7" suffix denotes 3,000-piece tape-and-reel packaging per ANSI/EIA-481 standard and has no effect on electrical or thermal specifications. All BZX84C33 variants (e.g., -7-F, -13-F, Q-7-F) share identical Zener voltage, impedance, and reliability characteristics-the suffix solely identifies packaging and compliance grade.
BZX84C33-7 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:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6%
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C33-7 FAQ
1.How can I place an order for BZX84C33-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C33-7 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 BZX84C33-7 reliable?
The price and inventory of BZX84C33-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C33-7 is usually 5 days.
3.What payment methods are accepted for BZX84C33-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C33-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C33-7?
BZX84C33-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C33-7 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 BZX84C33-7?
For technical support, including BZX84C33-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C33-7 requirements.
6.How does Aetrix verify that BZX84C33-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C33-7 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 BZX84C33-7 meets industry standards.
7.What is the process for return or replacement of BZX84C33-7?
All BZX84C33-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C33-7, 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 BZX84C33-7 part is unused and in its original packaging.
Return procedure for BZX84C33-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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