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Nexperia USA Inc. BZX84W-C30X
- Part No.:
- BZX84W-C30X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C30X.pdf
- Description:
- DIODE ZENER 30V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,875
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Product details
Overview
BZX84W-C30X from Nexperia is a ±5 % tolerance Zener voltage regulator diode with a nominal 30 V breakdown voltage, 300 Ω typical differential resistance at 2 mA, and 26.6 mV/K temperature coefficient, housed in an SOT323 (SC-70) package for space-constrained power rail stabilization in DC-DC feedback loops and reference circuits.
For engineers reviewing the BZX84W-C30X datasheet, BZX84W-C30X pinout, BZX84W-C30X application, or BZX84W-C30X equivalent, this part supports precision 30 V regulation in low-power analog sensing, voltage clamping, and overvoltage protection where thermal stability and small-footprint mounting are critical.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 30 V reference across its cathode-anode terminals under regulated current conditions. Its ±5 % tolerance and 26.6 mV/K temperature coefficient define its accuracy envelope over temperature and current variation.
The device exhibits 300 Ω typical dynamic impedance at IZ = 2 mA, enabling predictable voltage deviation under load transients, and delivers 50 nA maximum reverse leakage at VR = 0.7 × VZnom, ensuring minimal quiescent current draw in standby operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 30 V nominal, ±5 % tolerance (28.5 V to 32.0 V), defines stable regulation point for feedback or reference use |
| Differential Resistance rdif | 300 Ω max at IZ = 2 mA, determines output voltage shift per mA of current change |
| Temperature Coefficient SZ | 26.6 mV/K typical, quantifies VZ drift per degree Celsius rise in junction temperature |
| Reverse Leakage IR | 50 nA max at VR = 21 V, ensures negligible current draw below breakdown threshold |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on FR4 PCB, sets maximum continuous DC power handling capability |
| Junction-to-Ambient Rth(j-a) | 455 K/W in free air, governs thermal rise per watt dissipated without heatsinking |
| Forward Voltage VF | 0.9 V max at IF = 10 mA, specifies forward conduction drop when used as rectifier or clamp |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint dimensions 2.2 mm × 1.35 mm × 0.95 mm (L × W × H), optimized for reflow soldering on standard FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Positive terminal for forward bias; connected to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder joint permitted |
| 3 | Cathode (K) | Negative terminal for forward bias; connected to higher-potential node and serves as regulation output reference point |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective selection for non-critical 30 V reference applications without trimming circuitry |
| 26.6 mV/K temperature coefficient | Provides predictable, linear VZ drift over −55 °C to +150 °C ambient range |
| 300 Ω dynamic impedance at 2 mA | Ensures ≤0.6 V output shift for ±2 mA load current variation in feedback networks |
| 275 mW power rating on FR4 | Supports continuous regulation in low-current (<9.2 mA) 30 V shunt configurations |
| SOT323 ultra-small footprint | Reduces board area by >50 % vs. SOD-323 while maintaining compatible reflow profile |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
|
Use Scenario: Stabilizing output voltage in isolated flyback or buck-boost converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides precise 30 V reference to TL431 or optocoupler LED anode, setting regulation threshold. Use Value: ±5 % tolerance and 26.6 mV/K TC ensure <±3 % total output variation across −40 °C to +85 °C operating range. |
Use Scenario: Protecting microcontroller GPIO pins from transient surges exceeding 30 V in industrial sensor interfaces. IC Role / Device Role / Timing Role: Cathode tied to protected line, anode grounded-clamps voltage to 30 V + VF during ESD or inductive kick events. Use Value: 50 nA leakage at 21 V prevents false triggering; 40 W non-repetitive surge rating absorbs 100 µs transients. |
| Low-Power Analog Reference | Current Source Biasing |
|
Use Scenario: Generating stable bias voltage for op-amp input stages or ADC reference dividers in battery-powered instrumentation. IC Role / Device Role / Timing Role: Shunt-connected Zener supplies fixed 30 V reference to resistor-divider network feeding precision voltage reference IC. Use Value: 300 Ω rdif limits divider error to <0.3 % under 100 µA load, supporting 12-bit ADC accuracy. |
Use Scenario: Setting constant current through high-side LED strings or phototransistor collectors in optical isolation circuits. IC Role / Device Role / Timing Role: Anode connected to current-setting resistor, cathode to supply-maintains fixed 30 V drop to define ILED = (VCC − 30 V)/R. Use Value: 275 mW rating allows up to 9.2 mA continuous current at 30 V, sufficient for indicator or status LEDs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5262ET1G | 30 V nominal, ±5 %, 350 Ω rdif at 20 mA, 350 mW rating | Higher power rating enables higher current regulation but requires larger SOT-23 footprint | Select when >9 mA shunt current or higher surge immunity is required; not drop-in due to package and pinout mismatch |
| Vishay BZX84-C30-TP | 30 V nominal, ±5 %, 300 Ω rdif at 2 mA, identical SOT323 package and pinout | Same mechanical and electrical interface; minor differences in leakage (75 nA vs. 50 nA) and thermal resistance | Direct physical and functional replacement; verify layout compatibility with Vishay's solder mask clearance requirements |
Compared with BZX84W-C30X, MMBZ5262ET1G offers higher power handling at the cost of larger size and different pinout, while BZX84-C30-TP matches footprint and core specs but has slightly higher leakage-making it suitable for direct substitution where board space is constrained.
Availability
BZX84W-C30X is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp protection, and low-power analog reference applications requiring stable component supply with consistent parametric performance across production lots.
Supply support for BZX84W-C30X 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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified and industrial-grade components.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, thermally efficient voltage regulation in consumer, industrial, and computing power management systems.
FAQ
What is the maximum continuous reverse current for reliable Zener operation?
The BZX84W-C30X supports up to 9.2 mA continuous reverse current at 25 °C ambient, calculated from its 275 mW power rating and 30 V nominal Zener voltage. Operation above this level risks thermal runaway unless board-level copper area or forced airflow reduces junction temperature.
How does the not-connected (n.c.) pin affect PCB layout?
Pin 2 is internally unconnected and must remain electrically isolated-no trace, pad, or solder mask opening should contact it. Including it in a copper pour or routing near it may cause parasitic capacitance or solder bridging; Nexperia's recommended footprint excludes metal under this pin.
Can this Zener be used in forward-bias applications?
Yes-the BZX84W-C30X has a maximum forward voltage of 0.9 V at 10 mA, making it suitable as a low-drop rectifier or polarity protection diode. However, its 200 mA absolute maximum forward current is limited by thermal constraints, not junction design, so sustained >50 mA requires thermal derating.
What is the impact of the 26.6 mV/K temperature coefficient in a 0 °C to 70 °C environment?
Across a 70 °C temperature span, the Zener voltage shifts by approximately 1.86 V (26.6 mV/K × 70 K), resulting in a 30 V device operating between 28.14 V and 31.86 V. This 6.2 % drift must be accommodated in feedback compensation or trimmed via external resistors in precision applications.
BZX84W-C30X 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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 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-C30X FAQ
1.How can I place an order for BZX84W-C30X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C30X 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-C30X reliable?
The price and inventory of BZX84W-C30X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C30X is usually 5 days.
3.What payment methods are accepted for BZX84W-C30X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C30X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C30X?
BZX84W-C30X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C30X 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-C30X?
For technical support, including BZX84W-C30X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C30X requirements.
6.How does Aetrix verify that BZX84W-C30X is sourced from the original manufacturer or authorized distributors?
All BZX84W-C30X 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-C30X meets industry standards.
7.What is the process for return or replacement of BZX84W-C30X?
All BZX84W-C30X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C30X, 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-C30X part is unused and in its original packaging.
Return procedure for BZX84W-C30X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C30X Tags
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MM5Z5V1ST1G
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