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Nexperia USA Inc. BZX84W-B30-QF
- Part No.:
- BZX84W-B30-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B30-QF.pdf
- Description:
- DIODE ZENER 30V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:8,572
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Product details
Overview
BZX84W-B30-QF from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 30 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable voltage reference in low-power regulation and protection circuits, including ECU power rail clamping and sensor biasing.
For engineers reviewing the BZX84W-B30-QF datasheet, BZX84W-B30-QF pinout, BZX84W-B30-QF application, or BZX84W-B30-QF equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (455 K/W), non-repetitive surge capability (40 W), and automotive qualification status.
Technical Context
This device operates as a reverse-biased Zener diode with a nominal breakdown voltage of 30.0 V at IZ = 5 mA, differential resistance of 300 Ω at IZ = 0.5 mA, and temperature coefficient of +26.6 mV/K. Its junction-to-ambient thermal resistance is 455 K/W on standard FR4 PCB.
The SOT323 package features three terminals: anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3), enabling compact placement in space-constrained automotive modules. Reverse leakage current is limited to 50 nA at VR = 0.7 × VZnom.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.4 V to 30.6 V at IZ = 5 mA - defines precise regulation point for 30 V rail stabilization |
| Tolerance | ±2% - ensures tight voltage accuracy critical for automotive sensor reference circuits |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C - sets maximum continuous DC power handling on standard FR4 board |
| Differential Resistance (rdif) | 300 Ω at IZ = 0.5 mA - determines output impedance and load regulation sensitivity |
| Reverse Leakage (IR) | 50 nA at VR = 21 V - minimizes quiescent current in always-on automotive subsystems |
| Surge Capability (PZSM) | 40 W for tp = 100 µs - enables transient overvoltage suppression without failure |
| Thermal Resistance (Rth(j-a)) | 455 K/W - defines junction temperature rise per watt under natural convection cooling |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, and 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential side in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internal die pad with no electrical connection; must remain unconnected in PCB layout |
| 3 | Cathode (K) | Reverse-bias terminal; connected to higher-potential side and output node in shunt regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Wide voltage range (2.4–75 V) | Single-series compatibility across 74 Zener voltages simplifies BOM consolidation |
| Low capacitance (1.0 pF) | Enables high-frequency noise filtering and RF decoupling without signal distortion |
| Lead-free and RoHS compliant | Meets automotive environmental compliance requirements for solder reflow and end-of-life handling |
| Standard SC-70 footprint | Ensures drop-in replacement capability and compatibility with existing SMT assembly lines |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Bias Reference |
|---|---|
Use Scenario: Protecting microcontroller supply rails against load-dump transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Shunt Zener regulator absorbing excess energy during ISO 7637-2 pulse 5a events. Use Value: Maintains regulated 30 V clamp level with <50 nA leakage, preventing downstream IC damage without active control circuitry. |
Use Scenario: Providing stable excitation voltage for precision RTD or bridge-based pressure sensors. IC Role / Device Role / Timing Role: Passive voltage reference source with minimal self-heating impact on measurement accuracy. Use Value: ±2% tolerance and +26.6 mV/K temperature coefficient enable predictable drift compensation in 0–125 °C operating range. |
| USB Port Overvoltage Protection | Low-Power IoT Node Voltage Monitoring |
Use Scenario: Safeguarding USB data line receivers from accidental 24 V misconnection in industrial docking stations. IC Role / Device Role / Timing Role: Fast-acting crowbar element triggered by reverse breakdown above 30 V threshold. Use Value: 40 W non-repetitive surge rating absorbs 100 µs transients without degradation, preserving signal integrity. |
Use Scenario: Monitoring battery voltage in wireless sensor nodes using ADC input with internal reference. IC Role / Device Role / Timing Role: Low-leakage Zener divider element generating scaled-down analog monitor signal. Use Value: 50 nA reverse current at 21 V ensures <1 µA total divider current, extending coin-cell battery life beyond 10 years. |
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-Q | ±5% tolerance (28.5–32.0 V), higher max leakage (50 nA same), identical package and power rating | Acceptable where tighter voltage accuracy is not required, e.g., non-critical power sequencing | Select when cost sensitivity outweighs regulation precision needs |
| MMSZ4700T1G | 30 V nominal, ±5%, SOD-123 package, 500 mW Ptot, 300 Ω rdif, not AEC-Q101 qualified | Higher power handling but larger footprint and no automotive qualification | Prefer for industrial non-automotive designs requiring higher continuous dissipation |
Compared with BZX84W-B30-QF, BZX84W-C30-Q trades voltage accuracy for broader tolerance acceptance, while MMSZ4700T1G offers higher power at the expense of automotive qualification and board space - making BZX84W-B30-QF optimal for space-constrained, safety-critical automotive voltage references.
Availability
BZX84W-B30-QF is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor biasing, and low-power IoT voltage monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84W-B30-QF 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-enhancing components, with leadership in logic, discrete, and MOSFET technologies for automotive, industrial, and mobile markets.
The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode product line, designed specifically for reliable voltage regulation and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current this Zener can handle at 30 V?
The BZX84W-B30-QF is rated for 275 mW total power dissipation at 25 °C ambient. At 30 V Zener voltage, this corresponds to a maximum continuous reverse current of 9.2 mA (275 mW ÷ 30 V). Derating applies above 25 °C per the 455 K/W thermal resistance.
Is Pin 2 electrically functional or a mechanical dummy lead?
Pin 2 is explicitly marked "n.c." (not connected) in the official Nexperia datasheet and has no internal bond wire or die connection. It serves only as a mechanical anchor and must remain unconnected in PCB layout and schematic symbol to avoid unintended shorts or parasitic coupling.
How does the +26.6 mV/K temperature coefficient affect regulation stability?
The positive temperature coefficient means VZ increases by 26.6 mV per Kelvin rise in junction temperature. At 125 °C junction temperature (100 K above 25 °C), VZ rises by ~2.66 V - resulting in a final value near 32.7 V. This must be accounted for in high-temperature automotive applications where regulation margin is critical.
Can this part replace older BZX84C30LT1G in an existing design?
Yes, with caveats: both are 30 V Zeners in SOT-23 packages, but BZX84W-B30-QF uses SOT323 (smaller), has ±2% tolerance vs ±5%, and is AEC-Q101 qualified. Layout redesign is required for footprint compatibility, and the tighter tolerance may alter regulation behavior in sensitive feedback loops.
BZX84W-B30-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B30-QF FAQ
1.How can I place an order for BZX84W-B30-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B30-QF 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-B30-QF reliable?
The price and inventory of BZX84W-B30-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B30-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B30-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B30-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B30-QF?
BZX84W-B30-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B30-QF 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-B30-QF?
For technical support, including BZX84W-B30-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B30-QF requirements.
6.How does Aetrix verify that BZX84W-B30-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B30-QF 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-B30-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B30-QF?
All BZX84W-B30-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B30-QF, 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-B30-QF part is unused and in its original packaging.
Return procedure for BZX84W-B30-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B30-QF Tags
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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