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Nexperia USA Inc. BZX84W-B4V3X
- Part No.:
- BZX84W-B4V3X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B4V3X.pdf
- Description:
- DIODE ZENER 4.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,470
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Product details
Overview
BZX84W-B4V3X from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing precise 4.3 V reverse breakdown at 5 mA, with 90 Ω differential resistance and −2.5 mV/K temperature coefficient. It delivers stable reference voltage for low-power analog circuits, power supply feedback loops, and overvoltage protection in compact consumer and industrial PCBs.
For engineers reviewing the BZX84W-B4V3X datasheet, BZX84W-B4V3X pinout, BZX84W-B4V3X application, or BZX84W-B4V3X equivalent, key selection criteria include Zener voltage tolerance (±2 %), thermal resistance (455 K/W), forward voltage (≤0.9 V @ 10 mA), and non-repetitive surge capability (40 W @ 100 µs).
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 4.3 V reference across load variations, with nominal test current of 5 mA and guaranteed regulation within ±2 % tolerance. Its negative temperature coefficient (−2.5 mV/K) enables predictable drift compensation in temperature-sensitive references.
The device uses silicon planar epitaxial construction in a leadless SOT323 package, optimized for high-frequency stability (capacitance ≤6 pF @ 1 MHz, VR = 0 V) and low thermal resistance (455 K/W junction-to-ambient on FR4 PCB). It supports pulse operation up to 40 W for 100 µs without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal at IZ = 5 mA; tight ±2 % tolerance ensures accurate voltage reference in precision feedback paths |
| Differential Resistance (rdif) | 90 Ω max at IZ = 5 mA; low impedance maintains regulation stability under varying load currents |
| Temperature Coefficient (SZ) | −2.5 mV/K at IZ = 5 mA; predictable negative drift allows thermal error budgeting in reference designs |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA; enables use as low-drop rectifier or clamp in dual-polarity circuits |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines continuous DC power handling in standard layout |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 µs; supports transient overvoltage clamping without failure |
| Reverse Current (IR) | 3 µA max at VR = 1 V; low leakage preserves accuracy in high-impedance bias networks |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package: 1.35 mm × 1.75 mm footprint, 0.65 mm pitch, 0.9 mm height, leadless construction with tin-plated terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower potential side in reverse-bias configuration; forms cathode-anode junction for Zener conduction |
| 2 | Not Connected (n.c.) | Internally isolated terminal; must remain unconnected in PCB layout to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Connected to higher potential side in reverse-bias; carries regulated output current during breakdown operation |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables direct replacement in 4.3 V reference designs without recalibration or resistor trimming |
| 90 Ω differential resistance | Minimizes output voltage shift under ±1 mA load variation, critical for ADC reference buffers |
| −2.5 mV/K temperature coefficient | Allows predictable offset correction in temperature-compensated voltage monitors below 85 °C ambient |
| 6 pF junction capacitance | Supports >100 MHz noise filtering and RF decoupling without resonance issues in high-speed signal paths |
| 40 W non-repetitive surge rating | Clamps ESD transients (IEC 61000-4-2 Level 4) without parameter shift or bond-wire fusing |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides stable 4.3 V reference to TL431 shunt regulator input, setting primary-side feedback threshold. Use Value: ±2 % tolerance eliminates need for external trim potentiometer; 90 Ω rdif ensures <10 mV output shift across 0–100 mA load range. |
Use Scenario: Clamping 5 V rail against transient spikes in USB-powered IoT sensor nodes. IC Role / Device Role / Timing Role: Reverse-biased BZX84W-B4V3X limits rail voltage to 4.3 V + diode drop, protecting 5 V tolerant MCU GPIOs. Use Value: 40 W surge rating absorbs 1 kV ESD events per IEC 61000-4-2; 3 µA leakage avoids battery drain in sleep mode. |
| Reference Voltage Source | Signal Level Shifting |
|
Use Scenario: Generating precise 4.3 V bias for op-amp input stages in portable medical instrumentation. IC Role / Device Role / Timing Role: Provides low-noise, thermally stable reference for instrumentation amplifier common-mode voltage setting. Use Value: −2.5 mV/K coefficient enables matching with op-amp input offset drift; 6 pF capacitance prevents RF coupling into sensitive analog front-end. |
Use Scenario: Translating 3.3 V logic signals to 4.3 V interface level for legacy industrial sensors. IC Role / Device Role / Timing Role: Forward-biased anode-cathode path drops ~0.9 V, shifting 3.3 V logic high to ~4.2 V when driven from 5 V source. Use Value: ≤0.9 V VF at 10 mA ensures minimal propagation delay; SOT323 size fits dense routing in PLC I/O modules. |
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 MMBZ5229BS-7-F | 4.3 V ±5 % tolerance; 150 Ω rdif; 500 nA leakage @ VR = 3.01 V | Higher tolerance and leakage reduce accuracy in precision references but improve cost-effectiveness in non-critical clamping | Select when ±5 % regulation suffices and lower unit cost is prioritized over thermal stability |
| Vishay BZX84-C4V3-TP | 4.3 V ±5 % tolerance; 90 Ω rdif; −2.5 mV/K SZ; SOT23 package (larger footprint) | SOT23 requires 30 % more board area; identical electrical specs except tolerance and package thermal resistance | Choose only if existing SOT23 footprint compatibility is required and ±5 % tolerance is acceptable |
Compared with BZX84W-B4V3X, MMBZ5229BS-7-F trades tighter tolerance and lower leakage for lower cost, while BZX84-C4V3-TP matches key electrical parameters but sacrifices board space efficiency and thermal performance due to larger SOT23 package.
Availability
BZX84W-B4V3X is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for BZX84W-B4V3X 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, high-frequency-stable voltage regulation in space-constrained consumer, industrial, and computing applications.
FAQ
What is the maximum continuous power dissipation for BZX84W-B4V3X at 70 °C ambient?
At 70 °C ambient, derated power dissipation is 192 mW, calculated using Ptot(Tamb) = Ptot(25 °C) × [1 − (Tamb − 25)/125], based on 150 °C max junction temperature and 455 K/W thermal resistance. This ensures safe operation without exceeding Tj limit under sustained load.
Can BZX84W-B4V3X be used in forward-bias mode as a signal diode?
Yes - its forward voltage is specified ≤0.9 V at 10 mA, and it supports up to 200 mA forward current. However, it lacks optimized forward recovery characteristics; use is limited to low-speed clamping or level-shifting where switching speed is not critical.
How does the "B" suffix in BZX84W-B4V3X affect Zener voltage specification?
The "B" denotes ±2 % tolerance grade, meaning VZ is guaranteed between 4.21 V and 4.39 V at 5 mA. This contrasts with "C"-suffix variants (±5 %), which span 4.00 V to 4.60 V - critical for designs requiring tighter reference accuracy without post-production calibration.
Is BZX84W-B4V3X suitable for automotive applications?
No - this part is non-automotive qualified per Nexperia's revision history (Rev. 2, Jan 2023). Automotive alternatives require explicit "-Q" suffix (e.g., BZX84W-Q-B4V3X) and undergo AEC-Q101 qualification, including extended temperature cycling and humidity testing not performed on this variant.
BZX84W-B4V3X 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):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 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-B4V3X FAQ
1.How can I place an order for BZX84W-B4V3X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B4V3X 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-B4V3X reliable?
The price and inventory of BZX84W-B4V3X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B4V3X is usually 5 days.
3.What payment methods are accepted for BZX84W-B4V3X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B4V3X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B4V3X?
BZX84W-B4V3X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B4V3X 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-B4V3X?
For technical support, including BZX84W-B4V3X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B4V3X requirements.
6.How does Aetrix verify that BZX84W-B4V3X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B4V3X 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-B4V3X meets industry standards.
7.What is the process for return or replacement of BZX84W-B4V3X?
All BZX84W-B4V3X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B4V3X, 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-B4V3X part is unused and in its original packaging.
Return procedure for BZX84W-B4V3X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B4V3X Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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