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Nexperia USA Inc. BZX84W-B2V4-QF
- Part No.:
- BZX84W-B2V4-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B2V4-QF.pdf
- Description:
- DIODE ZENER 2.4V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,036
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Product details
Overview
BZX84W-B2V4-QF from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 2.4 V nominal breakdown voltage at 5 mA, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable reference voltage in low-power biasing, overvoltage clamping, and signal conditioning circuits.
For engineers reviewing the BZX84W-B2V4-QF datasheet, BZX84W-B2V4-QF pinout, BZX84W-B2V4-QF application, or BZX84W-B2V4-QF equivalent, this page delivers verified Zener parameters, automotive-grade reliability data, thermal resistance (455 K/W), reverse leakage (50 µA at 1 V), and differential resistance (600 Ω at 5 mA) - all critical for precision voltage reference design and ESD-robust power rail stabilization.
Technical Context
This Zener diode operates in reverse breakdown mode with a tightly controlled 2.4 V nominal Zener voltage (±2%) at IZ = 5 mA, exhibiting a negative temperature coefficient of −1.6 mV/K. Its low forward voltage (≤0.9 V at 10 mA) supports bidirectional clamping configurations.
The device features a non-repetitive peak reverse power dissipation of 40 W (100 µs pulse), junction-to-ambient thermal resistance of 455 K/W on FR4 PCB, and reverse capacitance of 6 pF at 1 MHz/0 V - enabling high-frequency regulation up to ~100 MHz in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal at IZ = 5 mA; ±2% tolerance ensures stable reference within 2.35–2.45 V for precision bias networks. |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines maximum continuous DC or low-duty-cycle pulsed operation without derating. |
| Differential Resistance (rdif) | 600 Ω max at IZ = 5 mA; indicates voltage regulation stiffness - lower values improve load regulation linearity. |
| Reverse Leakage (IR) | 50 µA max at VR = 1 V; critical for low-current standby circuits where leakage-induced error must be minimized. |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA; enables use as bidirectional clamp or low-drop rectifier in protection paths. |
| Junction Temperature (Tj) | 150 °C max; supports operation in under-hood automotive environments with appropriate PCB thermal design. |
| Thermal Resistance (Rth(j-a)) | 455 K/W on single-sided FR4; determines temperature rise per watt - essential for thermal margin calculation in dense layouts. |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package: 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, 0.45 mm height; optimized for automated reflow assembly and space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-bias configuration; required for proper Zener conduction path. |
| 2 | Not Connected (n.c.) | Internally unconnected terminal; must remain floating - no PCB trace or solder mask violation permitted. |
| 3 | Cathode (K) | Connects to higher-potential node; polarity marking aligns with cathode band on package top surface. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring extended temperature cycling and humidity resistance. |
| ±2% Zener voltage tolerance | Enables tighter regulation accuracy than ±5% variants, reducing need for post-calibration trimming in reference circuits. |
| Low 6 pF junction capacitance | Minimizes high-frequency signal distortion in RF detector or fast transient suppression applications up to 100 MHz. |
| 40 W non-repetitive surge rating | Withstands ESD events per IEC 61000-4-2 Level 4 (8 kV contact) when used with series impedance in protection networks. |
| FR4-compatible thermal performance | 455 K/W Rth(j-a) allows direct thermal modeling on standard PCBs without thermal vias or copper pours in cost-sensitive designs. |
Applications
| Automotive Sensor Biasing | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 2.4 V reference for analog front-end of tire pressure monitoring system (TPMS) sensors operating across −40 °C to +125 °C. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precise bias point for op-amp input stage and ADC reference divider. Use Value: ±2% tolerance and AEC-Q101 qualification ensure sensor output accuracy remains within 0.5% full-scale error over lifetime and temperature extremes. |
Use Scenario: Clamping VBUS line against transients during hot-plug events in USB 2.0 automotive infotainment interfaces. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor leveraging both forward (0.9 V) and reverse (2.4 V) conduction paths. Use Value: 40 W surge rating and 6 pF capacitance prevent signal integrity degradation while meeting USB-IF ESD immunity requirements. |
| Industrial PLC Input Protection | Low-Power IoT Reference Generator |
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from field-wiring induced surges and reverse polarity faults. IC Role / Device Role / Timing Role: Reverse-biased Zener shunt element placed between input and ground, activated above 2.4 V threshold. Use Value: 275 mW continuous dissipation and 150 °C junction rating allow sustained clamping during 100 ms overvoltage events without thermal runaway. |
Use Scenario: Generating accurate 2.4 V reference for ultra-low-power microcontroller ADC in battery-operated environmental sensor nodes. IC Role / Device Role / Timing Role: Precision Zener voltage source feeding resistive divider to produce 1.2 V internal reference. Use Value: 50 µA reverse leakage at 1 V ensures <100 nA quiescent current contribution, extending 10-year battery life in sub-µA sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C2V4-Q | ±5% tolerance (2.20–2.60 V range) vs. ±2% (2.35–2.45 V); identical package, power rating, and AEC-Q101 qualification. | Acceptable where reference accuracy <±3% suffices; reduces cost in non-critical biasing functions. | Select when absolute voltage stability is secondary to cost and supply chain flexibility. |
| MMSZ4678T1G | 2.4 V nominal, ±5%, SOD-123 package (larger footprint, 1.8 mm × 1.4 mm), 500 mW Ptot, not AEC-Q101 qualified. | Suitable for industrial/commercial boards where automotive qualification is unnecessary and board space permits larger package. | Choose only for non-automotive designs needing higher power headroom and legacy footprint compatibility. |
Compared with BZX84W-C2V4-Q, the BZX84W-B2V4-QF offers tighter voltage control at identical thermal and surge performance; versus MMSZ4678T1G, it trades higher power capability for automotive compliance and miniaturization - making it optimal for space- and reliability-constrained vehicle ECUs.
Availability
BZX84W-B2V4-QF is available at Aetrix Electronics and suitable for automotive sensor biasing, USB port overvoltage clamp, and industrial PLC input protection requiring stable component supply, AEC-Q101 assurance, and SOT323 footprint compatibility.
Supply support for BZX84W-B2V4-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 high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and advanced packaging.
The BZX84W-Q series targets automotive and industrial voltage regulation needs, delivering AEC-Q101-compliant Zener diodes in miniature SOT323 packages for space-constrained, thermally demanding applications.
FAQ
What is the maximum continuous reverse current the BZX84W-B2V4-QF can sustain at 25 °C?
The device does not specify a maximum continuous reverse current; instead, its safe operating limit is defined by power dissipation. At 25 °C ambient, with 275 mW Ptot and 2.4 V VZ, the maximum sustainable reverse current is approximately 114 mA (275 mW ÷ 2.4 V). Derating is required above 25 °C per the 455 K/W thermal resistance.
Can BZX84W-B2V4-QF replace BZX84C2V4 in an existing design?
Yes, with caveats: both share identical 2.4 V nominal voltage and SOT323 package, but BZX84W-B2V4-QF has ±2% tolerance and AEC-Q101 qualification, whereas BZX84C2V4 is ±5% and commercial-grade. Electrical substitution is valid if the tighter tolerance improves performance and automotive qualification is required; verify thermal layout compatibility due to identical Rth(j-a).
Is Pin 2 truly unconnected, or does it serve a mechanical function?
Pin 2 is electrically unconnected (n.c.) per Nexperia's official pinning diagram and internal construction. It serves no circuit function and must remain floating - however, it provides mechanical anchoring during reflow soldering and contributes to package coplanarity. Do not route traces or apply solder paste to this pad.
How does the −1.6 mV/K temperature coefficient affect long-term voltage stability?
The negative temperature coefficient means VZ decreases by 1.6 mV per Kelvin rise in junction temperature. Over a 100 °C range (−40 °C to +60 °C ambient, assuming ~50 °C self-heating), total drift is ~160 mV - a 6.7% shift from 2.4 V. For stable references, operate at minimal IZ and ensure adequate PCB heat sinking to limit ΔTj.
BZX84W-B2V4-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):
- 2.4 V
- Tolerance:
- ±2.08%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 1 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-B2V4-QF FAQ
1.How can I place an order for BZX84W-B2V4-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B2V4-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-B2V4-QF reliable?
The price and inventory of BZX84W-B2V4-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-B2V4-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B2V4-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B2V4-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B2V4-QF?
BZX84W-B2V4-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B2V4-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-B2V4-QF?
For technical support, including BZX84W-B2V4-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B2V4-QF requirements.
6.How does Aetrix verify that BZX84W-B2V4-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B2V4-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-B2V4-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B2V4-QF?
All BZX84W-B2V4-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B2V4-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-B2V4-QF part is unused and in its original packaging.
Return procedure for BZX84W-B2V4-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B2V4-QF Tags
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