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Nexperia USA Inc. BZX84W-C33F
- Part No.:
- BZX84W-C33F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C33F.pdf
- Description:
- DIODE ZENER 33V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,539
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Product details
Overview
BZX84W-C33F from Nexperia is a ±5 % tolerance Zener voltage regulator diode with nominal 33 V regulation, 32.3 V to 33.7 V breakdown range at IZ = 2 mA, 325 Ω differential resistance, and 29.7 mV/K temperature coefficient - used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX84W-C33F datasheet, BZX84W-C33F pinout, BZX84W-C33F application, or BZX84W-C33F equivalent, this device serves as a compact, SOT323-packaged Zener for stable DC biasing, clamping, and feedback sensing where tight voltage tolerance and low capacitance (0.9 pF) are required.
Technical Context
This Zener operates in reverse-biased breakdown mode with a specified 33 V nominal working voltage at 2 mA test current. Its ±5 % tolerance (C-grade), 325 Ω dynamic impedance, and positive 29.7 mV/K temperature coefficient indicate predictable thermal drift behavior above ~6 V, supporting stable reference generation across industrial temperature ranges.
Designed for surface-mount use in space-constrained PCBs, it delivers 275 mW total power dissipation on FR4 with single-sided copper and exhibits only 0.9 pF junction capacitance at 1 MHz and 0 V reverse bias - enabling reliable performance in high-frequency signal conditioning and noise-sensitive analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 33 V - precise DC reference point for feedback loops or voltage clamping at 2 mA test current |
| Tolerance | ±5 % - defines 32.3 V to 33.7 V operating window under production variation |
| Differential Resistance | 325 Ω - quantifies voltage regulation stiffness; lower values improve load regulation |
| Temperature Coefficient | +29.7 mV/K - predicts +2.97 V drift per 100 K rise; enables thermal error budgeting |
| Junction Capacitance | 0.9 pF at 1 MHz, 0 V - minimizes high-frequency loading in RF bias networks or fast transient clamps |
| Forward Voltage | ≤0.9 V at 10 mA - ensures low-loss conduction when used bidirectionally or in series with other devices |
| Max Power Dissipation | 275 mW on FR4 PCB - sets absolute thermal limit for continuous DC operation |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package: 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, 0.9 mm height, optimized for reflow soldering with defined land pattern (2.65 mm × 2.35 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to lower-potential node in Zener bias configuration |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection - must remain unconnected on PCB |
| 3 | Cathode (K) | Reverse-bias terminal; connects to higher-potential node to enable Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Wide voltage range coverage | 2.4 V to 75 V in E24 steps - supports standardized reference selection across diverse supply rails |
| Low junction capacitance | 0.9 pF at 1 MHz - preserves signal integrity in high-frequency bias and clamp applications |
| Stable temperature coefficient | +29.7 mV/K - enables predictable drift compensation in precision analog designs |
| Compact SMT footprint | SOT323 package - saves board area vs. larger packages like SOD-323 or DO-35 |
| High surge robustness | 40 W non-repetitive peak reverse power (100 µs pulse) - withstands transient overvoltage events |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
|
Use Scenario: Regulating output voltage of a 3.3 V or 5 V switching converter using TL431 or discrete op-amp feedback. IC Role / Device Role / Timing Role: Provides stable 33 V reference for optocoupler-based isolated feedback loop scaling. Use Value: Enables accurate output setpoint control within ±5 % tolerance without external trimming components. |
Use Scenario: Protecting microcontroller GPIO pins from ESD or inductive kickback in industrial sensor interfaces. IC Role / Device Role / Timing Role: Acts as shunt clamp between signal line and ground, conducting only above 33 V threshold. Use Value: Limits transient voltage to safe levels while adding <0.9 pF parasitic capacitance to preserve signal rise time. |
| DC Bias Generator | High-Frequency Signal Clamping |
|
Use Scenario: Establishing fixed bias points for RF amplifier transistors or op-amp input stages in telecom modules. IC Role / Device Role / Timing Role: Supplies stable DC offset voltage independent of supply rail fluctuations. Use Value: Maintains amplifier operating point stability with <325 Ω dynamic impedance limiting current-induced shift. |
Use Scenario: Limiting peak amplitude of 10–100 MHz clock signals in FPGA or ADC clock distribution networks. IC Role / Device Role / Timing Role: Functions as low-capacitance AC clamp in series with signal path to ground. Use Value: Prevents overshoot beyond 33 V without distorting edge integrity due to sub-1 pF junction capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5262BLT1G | 33 V ±5 %, 350 Ω rdif, SOT-23 package (larger footprint, 2.9 mm × 1.3 mm) | Higher thermal resistance (500 K/W vs. 455 K/W); less suitable for ultra-dense layouts | Choose when legacy SOT-23 compatibility or higher surge rating (50 W) is prioritized over board area. |
| Vishay BZX84-C33-TP | 33 V ±5 %, 300 Ω rdif, identical SOT323 package but 0.8 pF capacitance and −65 °C to +150 °C Tstg | Marginally lower capacitance; same mechanical fit but different thermal derating curve | Prefer for extended storage environments or where sub-0.9 pF capacitance improves RF performance margin. |
Compared with BZX84W-C33F, MMBZ5262BLT1G trades smaller size for higher surge capability and worse thermal resistance, while BZX84-C33-TP offers slightly better HF performance but lacks Nexperia's documented 275 mW FR4 dissipation rating.
Availability
BZX84W-C33F is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and DC bias generator applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for BZX84W-C33F 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies - delivering high-performance, reliable, and scalable discrete and logic solutions for automotive, industrial, and consumer markets.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-reliability voltage regulation in space-constrained and thermally demanding PCB environments.
FAQ
What is the maximum continuous reverse current for BZX84W-C33F at 25 °C ambient?
The device has no specified maximum continuous reverse current; instead, its operation is limited by power dissipation. At 25 °C ambient on FR4 PCB, 275 mW max power allows up to ~8.3 mA continuous reverse current (275 mW ÷ 33 V), assuming full Zener voltage drop and no thermal derating.
Can BZX84W-C33F be used in bidirectional TVS configurations?
No - BZX84W-C33F is a unidirectional Zener diode with anode and cathode terminals; pin 2 is not connected. It conducts only in reverse bias above 33 V. For bidirectional transient suppression, a dedicated symmetric TVS array or back-to-back Zener pair is required.
Is the "F" suffix in BZX84W-C33F part of the electrical specification?
No - the "F" is a manufacturing site code per Nexperia's marking table and does not affect electrical parameters. All BZX84W-C33 variants (e.g., S8%, F, or other suffixes) share identical 33 V ±5 % regulation, 325 Ω rdif, and 29.7 mV/K SZ characteristics.
How does the 2-pin active configuration (pins 1 and 3) interact with the n.c. pin 2 during PCB layout?
Pin 2 is internally unconnected and must remain electrically floating on the PCB. No trace, pad, or ground pour should contact it. The SOT323 footprint requires strict adherence to Nexperia's recommended land pattern (2.65 mm × 2.35 mm) to ensure reliable solder joint formation on pins 1 and 3 only.
BZX84W-C33F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C33F FAQ
1.How can I place an order for BZX84W-C33F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C33F 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 BZX84W-C33F reliable?
The price and inventory of BZX84W-C33F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C33F is usually 5 days.
3.What payment methods are accepted for BZX84W-C33F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C33F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C33F?
BZX84W-C33F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C33F 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 BZX84W-C33F?
For technical support, including BZX84W-C33F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C33F requirements.
6.How does Aetrix verify that BZX84W-C33F is sourced from the original manufacturer or authorized distributors?
All BZX84W-C33F 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 BZX84W-C33F meets industry standards.
7.What is the process for return or replacement of BZX84W-C33F?
All BZX84W-C33F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C33F, 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 BZX84W-C33F part is unused and in its original packaging.
Return procedure for BZX84W-C33F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C33F Tags
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MMSZ5231B-7-F
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MMSZ4682T1G
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MM5Z5V1ST1G
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