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Nexperia USA Inc. BZX84W-B4V3-QF
- Part No.:
- BZX84W-B4V3-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B4V3-QF.pdf
- Description:
- DIODE ZENER 4.3V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,911
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Product details
Overview
BZX84W-B4V3-QF from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 4.3 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 compact high-frequency power supply rails and ESD-protected signal conditioning circuits.
For engineers reviewing the BZX84W-B4V3-QF datasheet, BZX84W-B4V3-QF pinout, BZX84W-B4V3-QF application, or BZX84W-B4V3-QF equivalent, key selection criteria include Zener voltage tolerance (±2%), low differential resistance (90 Ω at 5 mA), junction temperature limit (150 °C), and automotive qualification status.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable 4.3 V reference across load variations, with a typical differential resistance of 90 Ω at IZ = 5 mA and temperature coefficient of −2.5 mV/K. Its low 1.25 pF capacitance at 1 MHz enables use in high-frequency regulation and noise-sensitive analog front-ends.
The device features a three-terminal SOT323 package with Pin 1 (anode), Pin 2 (not connected), and Pin 3 (cathode), supporting surface-mount reflow assembly on FR4 PCBs. Thermal resistance from junction to ambient is 455 K/W under standard mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal at IZ = 5 mA; tight ±2% tolerance ensures precise voltage clamping in feedback loops. |
| Differential Resistance (rdiff) | 90 Ω max at IZ = 5 mA; low impedance maintains regulation stability under dynamic load changes. |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB; defines maximum continuous DC or average pulsed power handling. |
| Reverse Current (IR) | 3 µA max at VR = 1 V; low leakage preserves accuracy in high-impedance bias networks. |
| Junction Temperature (Tj) | 150 °C max; supports operation in under-hood automotive environments and thermally constrained layouts. |
| Capacitance (Cd) | 1.25 pF at f = 1 MHz, VR = 0 V; minimal parasitic capacitance avoids signal distortion in RF or fast-switching circuits. |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; enables predictable forward conduction for dual-direction protection schemes. |
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. Designed for automated reflow soldering per IPC-7095 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connected to lower-potential node in reverse-bias configuration; carries current into diode during Zener operation. |
| 2 | Not Connected (n.c.) | Electrically isolated terminal; no internal bond wire or die connection-must remain unconnected in layout. |
| 3 | Cathode (K) | Connected to higher-potential node in reverse-bias configuration; reference output node for regulated voltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22-A114. |
| ±2% Zener voltage tolerance | Enables tighter regulation margins in precision feedback paths without external trimming components. |
| Low 1.25 pF junction capacitance | Minimizes signal coupling and phase shift in high-speed analog monitoring and clock buffer applications. |
| 455 K/W thermal resistance (j-a) | Allows direct thermal modeling for board-level power derating in confined spaces without heatsinking. |
| Non-repetitive peak power rating | 40 W surge capability (tp ≤ 100 µs) supports transient overvoltage suppression in CAN/LIN bus interfaces. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for microcontroller ADC input scaling in door module ECUs exposed to 12 V battery rail transients. IC Role / Device Role / Timing Role: Zener shunt regulator providing stable 4.3 V reference to op-amp gain stage driving MCU analog input. Use Value: ±2% tolerance and AEC-Q101 qualification ensure consistent measurement accuracy across −40 °C to +125 °C ambient range. |
Use Scenario: Precision biasing of bridge sensor outputs in factory-floor pressure transmitters with 4–20 mA loop interface. IC Role / Device Role / Timing Role: Low-capacitance voltage clamp protecting instrumentation amplifier inputs from ESD and line surges. Use Value: 1.25 pF capacitance prevents high-frequency noise injection into µV-level sensor signals. |
| USB-C Power Delivery Monitoring | Medical Patient Monitor Front-End |
Use Scenario: Overvoltage detection threshold in USB PD sink controller ICs monitoring VBUS during negotiation phases. IC Role / Device Role / Timing Role: Fast-response Zener element triggering fault logic when VBUS exceeds 4.3 V ±2% during hot-plug events. Use Value: 90 Ω differential resistance ensures rapid voltage stabilization during <100 ns transients. |
Use Scenario: Reference stabilization for isolated ECG amplifier stages requiring sub-mV baseline stability over 8-hour clinical sessions. IC Role / Device Role / Timing Role: Low-leakage (3 µA @ 1 V) shunt regulator maintaining fixed bias point for ultra-low-noise op-amps. Use Value: 3 µA reverse current minimizes error contribution in high-impedance (>10 MΩ) bias networks. |
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 MMBZ4685T1G | 4.3 V ±5%, 350 mW Ptot, SOT-23 package, no AEC-Q101 qualification | Higher power rating but wider tolerance and non-automotive qualification | Select when cost sensitivity outweighs automotive compliance and tighter tolerance needs |
| Vishay BZX84-C4V3-TP | 4.3 V ±5%, 300 mW Ptot, SOT-23, AEC-Q101 qualified | Same automotive qualification but looser tolerance and different package thermal profile | Select when board space allows SOT-23 and ±5% regulation margin is acceptable |
Compared with BZX84W-B4V3-QF, MMBZ4685T1G offers higher power but lacks automotive qualification and tighter tolerance, while BZX84-C4V3-TP matches AEC-Q101 compliance but trades ±2% precision for ±5% and uses SOT-23's less thermally efficient footprint.
Availability
BZX84W-B4V3-QF is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and medical device power management requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84W-B4V3-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.
BZX84W-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for robust voltage regulation in harsh-environment electronic control units and safety-critical subsystems.
FAQ
What is the maximum reverse current at 1 V for BZX84W-B4V3-QF?
The maximum reverse current (IR) is 3 µA at VR = 1 V and Tj = 25 °C, as specified in Table 7 of the datasheet. This low leakage ensures minimal error in high-impedance reference networks and supports accurate biasing in precision analog circuits.
Is Pin 2 electrically functional in the SOT323 package?
No - Pin 2 is explicitly marked "n.c." (not connected) in Table 2 and has no internal die connection. It must remain unconnected in PCB layout and schematic symbol to avoid unintended shorts or thermal stress during reflow soldering.
How does the −2.5 mV/K temperature coefficient affect regulation accuracy?
The temperature coefficient of −2.5 mV/K means the Zener voltage decreases by 2.5 mV per degree Celsius rise in junction temperature. At 100 °C ΔT, this results in ~250 mV drift - a critical factor when designing for wide ambient ranges like automotive under-hood applications.
Can BZX84W-B4V3-QF be used in place of standard BZX84-C4V3 variants?
No - BZX84W-B4V3-QF has ±2% tolerance and AEC-Q101 qualification, whereas standard BZX84-C4V3 parts have ±5% tolerance and lack automotive qualification. Substitution requires validation of both tolerance impact on system regulation margin and compliance with automotive reliability requirements.
BZX84W-B4V3-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):
- 4.3 V
- Tolerance:
- ±2.09%
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B4V3-QF FAQ
1.How can I place an order for BZX84W-B4V3-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B4V3-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-B4V3-QF reliable?
The price and inventory of BZX84W-B4V3-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-B4V3-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B4V3-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B4V3-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B4V3-QF?
BZX84W-B4V3-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B4V3-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-B4V3-QF?
For technical support, including BZX84W-B4V3-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B4V3-QF requirements.
6.How does Aetrix verify that BZX84W-B4V3-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B4V3-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-B4V3-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B4V3-QF?
All BZX84W-B4V3-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B4V3-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-B4V3-QF part is unused and in its original packaging.
Return procedure for BZX84W-B4V3-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B4V3-QF Tags
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