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Nexperia USA Inc. BZX84W-B2V4X
- Part No.:
- BZX84W-B2V4X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B2V4X.pdf
- Description:
- DIODE ZENER 2.4V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:143,814
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Product details
Overview
BZX84W-B2V4X from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 2.4 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 150 °C maximum junction temperature. It serves as a precision reference or low-power voltage clamp in power supply feedback paths, sensor biasing circuits, and overvoltage protection stages.
For engineers reviewing the BZX84W-B2V4X datasheet, BZX84W-B2V4X pinout, BZX84W-B2V4X application, or BZX84W-B2V4X equivalent, this page delivers verified Zener parameters, validated SOT323 terminal mapping, real-world regulation use cases, and cross-compatible alternatives with documented electrical differences.
Technical Context
This device operates in reverse breakdown to maintain stable DC voltage across its cathode-anode terminals under controlled current conditions. Its 2.4 V nominal Zener voltage is specified at IZ = 5 mA with ±2% tolerance, and exhibits a negative temperature coefficient of −1.6 mV/K at that current.
The diode features 600 Ω typical differential resistance at IZ = 1 mA, 100 Ω at IZ = 5 mA, and 6 pF junction capacitance at 1 MHz and 0 V reverse bias - characteristics critical for stability in low-noise analog references and high-frequency clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.4 V nominal at IZ = 5 mA; tight ±2% tolerance enables accurate voltage referencing in feedback loops |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines maximum continuous steady-state power handling |
| Differential Resistance (rdif) | 100 Ω at IZ = 5 mA; determines output impedance and regulation sensitivity to current variation |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA; ensures low-loss conduction when used in forward-biased protection paths |
| Junction Capacitance (Cd) | 6 pF at f = 1 MHz, VR = 0 V; supports stable operation in high-frequency signal conditioning and RF decoupling |
| Reverse Current (IR) | 50 µA max at VR = 1 V; confirms low leakage in standby or high-impedance bias networks |
| Thermal Resistance (Rth(j-a)) | 455 K/W in free air on standard FR4; informs thermal derating requirements for ambient temperatures above 25 °C |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint and 0.65 mm pitch enable high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Electrically isolated internal pad; no circuit connection required during layout or assembly |
| 3 | Cathode (K) | Reverse-bias terminal where regulated voltage appears; tied to higher-potential node in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables tighter regulation accuracy than ±5% variants, reducing need for post-regulation trimming in precision analog circuits |
| 275 mW power rating on FR4 | Supports higher current regulation (up to ~115 mA at 2.4 V) without heatsinking in space-constrained consumer and industrial PCBs |
| 6 pF junction capacitance | Minimizes high-frequency loading in RF detector biasing and fast transient suppression applications |
| −1.6 mV/K temperature coefficient | Provides predictable, linear drift behavior for temperature-compensated reference designs using complementary diodes |
| SOT323 package compatibility | Ensures drop-in replacement capability with industry-standard reflow and wave soldering footprints per Nexperia's recommended land patterns |
Applications
| Power Supply Feedback Reference | Sensor Biasing Network |
|---|---|
|
Use Scenario: Stabilizing output voltage in adjustable linear regulators (e.g., TL431-based supplies) via resistive divider feedback. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 2.4 V threshold to comparator input or error amplifier reference node. Use Value: ±2% tolerance eliminates need for external calibration; low rdif maintains regulation stability across load transients. |
Use Scenario: Supplying stable bias current to analog sensors (e.g., thermistors, RTDs) in measurement front-ends. IC Role / Device Role / Timing Role: Low-drift Zener source establishing fixed reference potential for excitation or offset compensation. Use Value: −1.6 mV/K TC allows predictable correction in software; 6 pF Cd avoids signal integrity degradation at sensor bandwidths up to 10 MHz. |
| Overvoltage Clamp Protection | High-Frequency Signal Clipping |
|
Use Scenario: Protecting microcontroller I/O pins from ESD or surge-induced voltage spikes on communication lines. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting excess energy to ground when line voltage exceeds 2.4 V + VF. Use Value: 40 W non-repetitive peak power rating handles IEC 61000-4-2 Level 4 pulses; n.c. pin simplifies PCB routing near sensitive nodes. |
Use Scenario: Limiting amplitude of RF signals in receiver front-ends or clock distribution networks. IC Role / Device Role / Timing Role: Passive clipping element exploiting sharp Zener knee and low Cd to suppress harmonics without distorting fundamental frequency. Use Value: 6 pF capacitance preserves signal rise time below 1 ns; 275 mW Ptot sustains continuous clipping at 100 mW average RF power. |
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 MMBZ5221BS | 2.4 V, ±5% tolerance; 350 mW rating; SOT-23 package; 100 Ω rdif at 20 mA | Higher power but looser tolerance; requires different PCB footprint and thermal layout | Select when higher surge robustness is needed and ±5% regulation accuracy is acceptable |
| Vishay BZX84-C2V4 | 2.4 V, ±5% tolerance; identical SOT323 package; 275 mW rating; 600 Ω rdif at 1 mA | Same mechanical fit but wider voltage spread; higher rdif reduces regulation stiffness | Choose for cost-sensitive designs where ±5% tolerance meets system-level accuracy budget |
Compared with BZX84W-B2V4X, MMBZ5221BS offers greater surge resilience but sacrifices precision and board-space compatibility, while BZX84-C2V4 matches footprint and power but trades regulation accuracy and dynamic response for lower unit cost.
Availability
BZX84W-B2V4X is available at Aetrix Electronics and suitable for power supply feedback reference, sensor biasing network, and overvoltage clamp protection requiring stable component supply across industrial control, automotive sub-systems, and IoT edge devices.
Supply support for BZX84W-B2V4X 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 discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation and clamping in space-constrained, high-reliability surface-mount applications.
FAQ
What is the maximum reverse current at 1 V for BZX84W-B2V4X?
The maximum reverse current (IR) is 50 µA when reverse voltage (VR) is 1 V, as specified in Table 7 of the datasheet. This value reflects leakage performance under sub-threshold bias and is critical for low-power standby circuits where quiescent current must remain below 100 µA.
Can BZX84W-B2V4X be used in place of a 2.5 V Zener diode?
No - BZX84W-B2V4X is strictly rated for 2.4 V nominal Zener voltage at 5 mA, with guaranteed range of 2.35 V to 2.45 V. Substituting it for a 2.5 V part introduces a systematic 4% low-side error in regulation, which violates design margins in applications like ADC reference buffers or comparator thresholds requiring exact 2.5 V.
Is the not-connected (n.c.) pin internally bonded or floating?
Pin 2 is electrically isolated with no internal bond wire or die connection, confirmed by Nexperia's pinning diagram and package cross-section. It must remain unconnected on PCBs; routing traces or applying solder paste to this pad risks shorting adjacent terminals due to SOT323's 0.65 mm pitch and minimal creepage.
How does thermal resistance change when mounted on 2-layer vs. 1-layer FR4?
The datasheet specifies Rth(j-a) = 455 K/W only for single-sided copper, tin-plated FR4 with standard footprint. On 2-layer boards with internal ground planes, thermal resistance typically improves by 20–30%, but Nexperia does not publish validated values - designers must perform board-level thermal simulation or empirical testing to confirm junction temperature under actual operating conditions.
BZX84W-B2V4X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.4 V
- Tolerance:
- ±2%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B2V4X FAQ
1.How can I place an order for BZX84W-B2V4X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B2V4X 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-B2V4X reliable?
The price and inventory of BZX84W-B2V4X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B2V4X is usually 5 days.
3.What payment methods are accepted for BZX84W-B2V4X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B2V4X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B2V4X?
BZX84W-B2V4X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B2V4X 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-B2V4X?
For technical support, including BZX84W-B2V4X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B2V4X requirements.
6.How does Aetrix verify that BZX84W-B2V4X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B2V4X 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-B2V4X meets industry standards.
7.What is the process for return or replacement of BZX84W-B2V4X?
All BZX84W-B2V4X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B2V4X, 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-B2V4X part is unused and in its original packaging.
Return procedure for BZX84W-B2V4X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B2V4X Tags
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onsemi
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MMSZ5245BS-7-F
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MM5Z5V1ST1G
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