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Nexperia USA Inc. BZX84W-B30F
- Part No.:
- BZX84W-B30F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B30F.pdf
- Description:
- DIODE ZENER 30V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,591
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Product details
Overview
BZX84W-B30F from Nexperia is a ±2 % 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, designed for precision voltage reference and overvoltage protection in compact SMT power management circuits.
For engineers reviewing the BZX84W-B30F datasheet, BZX84W-B30F pinout, BZX84W-B30F application, or BZX84W-B30F equivalent, this page delivers verified package mapping (SOT323), terminal roles (anode/cathode/not connected), thermal resistance (455 K/W), reverse leakage (50 nA at 21 V), and validated alternatives for low-power regulation and clamping.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable 30 V regulation across load and line variations, with specified test current of 2 mA per IEC 60134 limiting values. Its non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses.
The device exhibits a positive temperature coefficient of +26.6 mV/K at 2 mA, indicating increasing Zener voltage with junction temperature-critical for thermal drift compensation in reference designs. Junction-to-ambient thermal resistance is 455 K/W on standard FR4 PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 29.4 V to 30.6 V at IZ = 2 mA; ensures ±2 % regulation accuracy under nominal bias |
| Differential Resistance rdif | 300 Ω max at IZ = 2 mA; defines output impedance and load regulation sensitivity |
| Temperature Coefficient SZ | +26.6 mV/K at IZ = 2 mA; quantifies voltage drift per degree Celsius rise in Tj |
| Reverse Leakage IR | 50 nA max at VR = 21 V; determines quiescent current loss in high-impedance bias networks |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on FR4 PCB; sets maximum continuous DC power handling |
| Junction Temperature Tj | −55 °C to +150 °C operating range; enables use in industrial and extended-temperature environments |
| Diode Capacitance Cd | 1.0 pF at f = 1 MHz, VR = 0 V; supports high-frequency noise suppression and fast transient response |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, optimized for automated placement and reflow soldering on space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connects to lower-potential node in reverse-bias regulation configuration |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad; no circuit function-must remain unconnected in layout |
| 3 | Cathode (K) | Reverse-bias current exit and voltage reference node; ties to regulated output or clamp rail |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation margins than ±5 % variants, reducing need for post-calibration trimming |
| Low 1.0 pF capacitance | Minimizes signal distortion and phase shift in RF bias networks and high-speed clamping paths |
| 455 K/W junction-to-ambient Rth(j-a) | Supports thermal design predictability on standard FR4 without heatsinking for ≤275 mW operation |
| 40 W non-repetitive surge rating | Withstands ESD transients and inductive kickback events up to 100 µs duration without degradation |
| SC-70 footprint compatibility | Ensures drop-in replacement capability with industry-standard pick-and-place equipment and reflow profiles |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 30 V reference for feedback loop of adjustable DC-DC converter. IC Role / Device Role / Timing Role: Zener diode acts as precision shunt reference, sinking excess current to hold output voltage constant. Use Value: ±2 % tolerance and +26.6 mV/K TC allow predictable output drift compensation across −40 °C to +85 °C ambient. |
Use Scenario: Protecting microcontroller I/O pins from 33 V surge events on industrial sensor interface lines. IC Role / Device Role / Timing Role: Fast-acting shunt clamp that conducts above 30.6 V to divert transient energy to ground. Use Value: 1.0 pF capacitance preserves signal integrity up to 100 MHz; 40 W pulse rating absorbs 100 µs surges without failure. |
| Low-Power Bias Network | High-Frequency Signal Conditioning |
|
Use Scenario: Generating stable bias voltage for op-amp input stage in battery-powered instrumentation amplifier. IC Role / Device Role / Timing Role: Low-leakage (50 nA) Zener establishes fixed reference while minimizing standby current draw. Use Value: 275 mW power limit allows safe operation at 2 mA bias current with margin for ambient temperature rise. |
Use Scenario: AC-coupling and level-shifting RF detector output in 2.4 GHz ISM-band receiver front-end. IC Role / Device Role / Timing Role: Shunt element stabilizing DC offset while presenting minimal capacitive loading to RF path. Use Value: Sub-1 pF junction capacitance avoids resonance shifts and insertion loss above 1 GHz, confirmed at 1 MHz/0 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C30 | ±5 % tolerance (28.5–32.0 V), higher 50 nA leakage at 21 V, same SOT323 package and 300 Ω rdif | Acceptable where ±5 % regulation accuracy suffices and cost optimization is prioritized | Select when absolute voltage stability is secondary to BOM simplification across multiple Zener voltages |
| MMSZ5261B | ±5 % tolerance (28.5–31.5 V), 350 Ω rdif, 500 nA leakage at 21 V, SOD-123 package (larger footprint) | Requires PCB redesign due to different land pattern; higher leakage limits ultra-low-power use cases | Choose only if existing design uses SOD-123 and thermal margin exceeds 455 K/W requirement |
Compared with BZX84W-B30F, BZX84W-C30 trades tighter voltage control for broader tolerance and identical thermal performance, while MMSZ5261B introduces package incompatibility and higher leakage-making BZX84W-B30F optimal for space-constrained, precision-clamp designs.
Availability
BZX84W-B30F is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and medical sensor interfaces requiring stable component supply, consistent parametric performance, and long-term obsolescence mitigation.
Supply support for BZX84W-B30F 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 advanced packaging and automotive-grade qualification.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, cost-effective voltage regulation and protection in consumer, industrial, and communication systems.
FAQ
What is the maximum continuous forward current for BZX84W-B30F?
The device is not rated for continuous forward conduction. Its Absolute Maximum Rating specifies 200 mA peak forward current under pulsed conditions only. In normal Zener operation, it functions in reverse bias; forward voltage is 0.9 V at 10 mA, but sustained forward current risks thermal runaway and permanent damage.
Can BZX84W-B30F be used in parallel for higher power dissipation?
No-Zener diodes exhibit negative temperature coefficients below ~5 V and positive above, but even within the same batch, slight VZ mismatches cause current hogging. Parallel connection leads to thermal instability and premature failure; derating or heat-sinking the single device is the correct approach.
Is the 'n.c.' pin electrically isolated or internally tied to substrate?
Pin 2 is a true no-connect terminal: physically present but electrically isolated from all internal semiconductor structures. It must not be soldered to any net or ground plane, as doing so may compromise mechanical reliability and thermal performance per Nexperia's SOT323 mounting guidelines.
How does the 26.6 mV/K temperature coefficient impact regulation accuracy over temperature?
At 2 mA bias, a +26.6 mV/K coefficient means VZ increases by ~2.7 V across a 100 K junction temperature rise (e.g., 25 °C to 125 °C). For applications demanding <1 % total error, active compensation or tighter ambient control is required-this value is measured, not modeled.
BZX84W-B30F 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:
- ±2%
- 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-B30F FAQ
1.How can I place an order for BZX84W-B30F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B30F 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-B30F reliable?
The price and inventory of BZX84W-B30F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B30F is usually 5 days.
3.What payment methods are accepted for BZX84W-B30F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B30F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B30F?
BZX84W-B30F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B30F 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-B30F?
For technical support, including BZX84W-B30F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B30F requirements.
6.How does Aetrix verify that BZX84W-B30F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B30F 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-B30F meets industry standards.
7.What is the process for return or replacement of BZX84W-B30F?
All BZX84W-B30F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B30F, 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-B30F part is unused and in its original packaging.
Return procedure for BZX84W-B30F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B30F Tags
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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