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Diodes Incorporated BZX84C33W-7
- Part No.:
- BZX84C33W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84C33W-7.pdf
- Description:
- DIODE ZENER 33V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,075
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Product details
Overview
BZX84C33W-7 from Diodes Incorporated is a 33 V, 200 mW surface-mount Zener diode in SOT-323 package, rated for 2 mA test current with 31–35 V zener voltage range, 80 Ω maximum zener impedance at 2 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 datasheet, BZX84C33W-7 pinout, BZX84C33W-7 application, or BZX84C33W-7 equivalent, key selection criteria include nominal zener voltage tolerance (±3.0%), thermal resistance (625 K/W), operating temperature range (−65 °C to +125 °C), and RoHS-compliant green molding compound construction.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified zener voltage of 33.0 V (min 31.0 V, max 35.0 V) at IZT = 2.0 mA. Its temperature coefficient is +23.1 to +33.4 mV/°C, indicating positive drift above 6 V, requiring thermal compensation in high-stability references.
It delivers stable regulation under low-current conditions (IZK = 0.5 mA, VZ ≈ 23.1 V) and maintains low dynamic impedance (ZZT ≤ 80 Ω) at 2 mA, supporting consistent clamping performance across ambient temperatures up to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33.0 V nominal, 31.0–35.0 V range at IZT = 2 mA - defines regulation setpoint with ±3.0% tolerance |
| Power Dissipation (PD) | 200 mW at TA = 25 °C - limits continuous dissipation without heatsinking on FR4 PCB |
| Zener Impedance (ZZT) | ≤80 Ω at IZT = 2 mA, f = 1 kHz - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 23.1 V - guarantees low standby current in bias/reference networks |
| Thermal Resistance (RθJA) | 625 K/W - determines junction temperature rise per mW on standard FR4 layout |
| Operating Temperature | −65 °C to +125 °C - supports industrial and automotive under-hood environments |
| Package | SOT-323 - 0.006 g ultra-small footprint compatible with fine-pitch automated assembly |
Pinout & Package
Package: SOT-323 - three-terminal plastic surface-mount case with lead-free matte tin plating, UL 94V-0 flammability rating, and moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / cathode reference node in reverse-biased operation | Connected to lower-potential side in regulation/clamp configuration; polarity marked on top view |
| Cathode | Zener breakdown terminal / voltage reference node | Connected to higher-potential side; carries regulated output voltage when reverse-biased |
| Case / Not Connected | Non-electrical mechanical termination | No internal connection; serves only as structural anchor and thermal path to PCB pad |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight VZ tolerance control and repeatable breakdown characteristics across production lots |
| Green molding compound | Halogen-free, Sb2O3-free encapsulation compliant with environmental directives post-2006 date codes |
| Lead-free terminations | Matte tin finish annealed over Alloy 42 leadframe meets RoHS and JEDEC solderability standards |
| Ultra-small SOT-323 footprint | 2.2 × 1.35 × 0.9 mm outline enables high-density PCB layouts in space-constrained modules |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 33 V reference for ADC biasing or op-amp feedback networks in battery-powered sensors. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference node voltage. Use Value: Delivers <±3% regulation accuracy at 2 mA with <80 Ω dynamic impedance, minimizing reference drift across temperature. | Use Scenario: Protecting microcontroller I/O pins from ESD-induced voltage spikes exceeding 33 V. IC Role / Device Role / Timing Role: Shunt clamp limiting transient voltage to safe levels before reaching sensitive inputs. Use Value: Activates at 31–35 V with sub-µA leakage below threshold, ensuring no signal loading during normal operation. |
| Low-Power Voltage Monitor | Signal Level Translation |
Use Scenario: Detecting brown-out conditions in 3.3 V or 5 V systems using comparator input referenced to 33 V via resistor divider. IC Role / Device Role / Timing Role: Precision voltage threshold element defining trip point for undervoltage detection. Use Value: Tight 31–35 V tolerance and +23.1 to +33.4 mV/°C TC enable predictable trip-point calibration across −65 °C to +125 °C. | Use Scenario: Shifting logic-level signals between 3.3 V and 5 V domains using series resistor + Zener clamp topology. IC Role / Device Role / Timing Role: Clamping diode establishing upper rail limit for bidirectional level translation. Use Value: Low 0.1 µA leakage at 23.1 V prevents DC loading; 80 Ω ZZT ensures fast transient response during edge transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5265BW | 33 V nominal, 200 mW, SOT-23 package, 100 Ω ZZT, wider VZ tolerance (±5%) | Larger footprint; higher dynamic impedance reduces regulation stability under varying loads | Preferred where SOT-23 handling or legacy board compatibility is required |
| BZX84-C33 | Same electrical specs but non-RoHS SOT-23 variant; lacks green compound and lead-free plating | Not suitable for new designs targeting RoHS or halogen-free compliance | Select only for repair or legacy replacement where environmental compliance is waived |
Compared with BZX84C33W-7, MMBZ5265BW offers similar voltage but looser tolerance and higher impedance, while BZX84-C33 matches performance but fails modern environmental requirements-making the -7 variant optimal for new industrial and portable designs needing compact, compliant regulation.
Availability
BZX84C33W-7 is available at Aetrix Electronics and suitable for power supply reference design, overvoltage protection circuits, low-power voltage monitoring, and signal level translation requiring stable component supply and full RoHS compliance.
Supply support for BZX84C33W-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The BZX84 series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, reliable voltage regulation and protection in consumer, industrial, and computing applications.
FAQ
What is the maximum reverse voltage this Zener can safely clamp without damage?
The BZX84C33W-7 has a maximum peak pulse power rating not specified in the DS30066 datasheet, but its absolute maximum reverse voltage is limited by its 200 mW continuous power dissipation. At 33 V, sustained current must remain below ~6.06 mA to avoid thermal runaway; transient clamping requires external series resistance to limit IZ within safe operating area.
Does this part have a specified capacitance value for high-frequency filtering use?
No capacitance specification is provided for BZX84C33W-7 in the DS30066 datasheet. Figure 4 shows typical total capacitance vs. nominal zener voltage, estimating ~10–15 pF for 33 V devices at VR = 1 V, but this is not guaranteed or tested - it should not be relied upon for RF or timing-critical filtering.
Can this Zener be used in series to achieve higher reference voltages?
Yes, multiple BZX84C33W-7 diodes may be connected in series to generate higher reference voltages (e.g., two in series ≈ 66 V), but voltage distribution will vary due to unit-to-unit VZ tolerance (±3%) and differing temperature coefficients - active balancing or trimming is recommended for precision applications.
Is the SOT-323 package compatible with standard reflow profiles for lead-free assembly?
Yes, the SOT-323 package with matte tin plating is qualified for lead-free reflow per J-STD-020D Level 1 moisture sensitivity, supporting peak temperatures up to 260 °C. Recommended pad layout and thermal relief patterns are documented in Diodes' AP02001 application note.
BZX84C33W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±6.06%
- Power - Max:
- 200 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84C33W-7 FAQ
1.How can I place an order for BZX84C33W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C33W-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 BZX84C33W-7 reliable?
The price and inventory of BZX84C33W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C33W-7 is usually 5 days.
3.What payment methods are accepted for BZX84C33W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C33W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C33W-7?
BZX84C33W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C33W-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 BZX84C33W-7?
For technical support, including BZX84C33W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C33W-7 requirements.
6.How does Aetrix verify that BZX84C33W-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C33W-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 BZX84C33W-7 meets industry standards.
7.What is the process for return or replacement of BZX84C33W-7?
All BZX84C33W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C33W-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 BZX84C33W-7 part is unused and in its original packaging.
Return procedure for BZX84C33W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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