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Nexperia USA Inc. BZX384-B4V3-QX
- Part No.:
- BZX384-B4V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B4V3-QX.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,718
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Product details
Overview
BZX384-B4V3-Q from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 4.3 V nominal breakdown voltage at 5 mA, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX384-B4V3-Q datasheet, BZX384-B4V3-Q pinout, BZX384-B4V3-Q application, or BZX384-B4V3-Q equivalent, this device serves as a precision low-power shunt regulator in ECU power rails, sensor biasing networks, and ADC reference stabilization where stable 4.3 V clamping with <±2 % tolerance and low temperature coefficient (−3.5 to 0.0 mV/K) is required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 4.3 V reference across its terminals under regulated current conditions (IZ = 5 mA). Its differential resistance is ≤90 Ω, ensuring minimal voltage deviation under load variation.
Designed for automotive-grade reliability, it supports non-repetitive peak reverse power dissipation up to 40 W (tp = 100 μs), junction temperature range from −65 °C to +150 °C, and meets AEC-Q101 stress test requirements for discrete semiconductors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 4.21 V to 4.39 V at IZ = 5 mA - defines tight ±2 % regulation window for accurate voltage clamping |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Differential Resistance (rdif) | ≤90 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Current (IR) | ≤3 μA at VR = 1 V - ensures low leakage in standby or high-impedance bias networks |
| Temperature Coefficient (SZ) | −3.5 to 0.0 mV/K at IZ = 5 mA - quantifies VZ drift over temperature for stability-critical references |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - enables transient surge suppression without failure |
| Junction Temperature (Tj) | −65 °C to +150 °C - supports operation in under-hood automotive environments |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm footprint, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias anode-to-cathode voltage establishes breakdown |
| 2 | Anode (A) | Connected to ground or lower-potential rail; current flows from cathode to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS power domains |
| ±2 % voltage tolerance | Enables precise 4.3 V reference without post-production trimming in cost-sensitive designs |
| Low thermal resistance (Rth(j-sp) = 110 K/W) | Improves heat transfer from junction to solder point, supporting sustained 300 mW operation |
| Non-repetitive 40 W surge rating | Protects downstream circuitry against ESD and load-dump transients in 12 V vehicle systems |
| SOD323 compact footprint | Reduces PCB area by >50 % vs. DO-35, enabling dense layout in space-constrained modules |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Biasing Network |
|---|---|
Use Scenario: Stabilizing 5 V supply rail in engine control unit against battery voltage spikes and ripple. IC Role / Device Role / Timing Role: Shunt regulator maintaining fixed 4.3 V reference to feed LDO error amplifier feedback network. Use Value: Prevents false triggering of microcontroller reset logic during 24 V load dump events due to tight ±2 % tolerance and 40 W surge capability. |
Use Scenario: Providing stable bias voltage for analog pressure sensor bridge excitation in factory automation transmitters. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric measurement accuracy. Use Value: Enables <±0.5 % full-scale error over −40 °C to +125 °C via low −3.5 to 0.0 mV/K temperature coefficient. |
| ADC Reference Stabilization | USB Port Overvoltage Protection |
Use Scenario: Decoupling reference input of 12-bit SAR ADC in medical monitoring equipment. IC Role / Device Role / Timing Role: Low-noise, low-leakage (≤3 μA) voltage clamp isolating reference from digital noise coupling. Use Value: Reduces code spread by 3 LSBs compared to unregulated zener alternatives due to ≤90 Ω differential resistance. |
Use Scenario: Protecting USB data lines from 12 V accidental misconnection in industrial docking stations. IC Role / Device Role / Timing Role: Fast-acting shunt protector diverting surge current before TVS diode activation threshold. Use Value: Responds within 100 ns to clamp transients below 5.5 V, preserving USB PHY integrity without adding series impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-A4V3-Q | ±1 % tolerance (4.25–4.35 V), higher cost, tighter rdif (≤60 Ω) | Better for metrology-grade references requiring <±0.5 % system error | Select when absolute voltage accuracy outweighs cost sensitivity and thermal drift is actively compensated. |
| BZX384-C4V3-Q | ≈±5 % tolerance (4.00–4.60 V), lower cost, higher IR (≤10 μA at VR = 1 V) | Suitable for non-critical power-good detection or coarse threshold sensing | Choose for consumer-grade power sequencing where 4.3 V nominal is sufficient and leakage is not critical. |
Compared with BZX384-A4V3-Q and BZX384-C4V3-Q, the BZX384-B4V3-Q delivers optimal balance of accuracy, leakage, and cost for automotive and industrial voltage reference use cases where ±2 % tolerance meets functional safety requirements without premium pricing.
Availability
BZX384-B4V3-Q is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor signal conditioning, and USB interface protection requiring stable component supply with AEC-Q101 compliance and traceable sourcing.
Supply support for BZX384-B4V3-Q 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 energy-efficient solutions.
The BZX384-Q series belongs to Nexperia's automotive-grade Zener regulator product line, engineered specifically for robust voltage reference and overvoltage protection in harsh-environment electronic control modules.
FAQ
What is the maximum continuous forward current for BZX384-B4V3-Q?
The device is not rated for continuous forward conduction; its primary function is reverse-bias Zener operation. Absolute maximum forward current is 250 mA per limiting values table, but sustained forward bias exceeds design intent and risks thermal runaway. It must be operated in reverse breakdown for regulation.
Can BZX384-B4V3-Q replace a 4.3 V TL431-based shunt regulator?
No - the BZX384-B4V3-Q is a passive two-terminal Zener diode, while TL431 is an active three-terminal adjustable shunt regulator with 2.5 V reference and op-amp feedback. It lacks programmability, low output impedance, or sink current capability; use only where simple fixed-voltage clamping suffices.
How does the SOD323 package affect thermal performance in high-density PCB layouts?
With Rth(j-a) = 415 K/W in free air and Rth(j-sp) = 110 K/W to solder point, thermal performance depends heavily on copper pour area and via count under the cathode pad. Adding two 0.3 mm thermal vias beneath the cathode reduces effective Rth(j-a) by ~35 %, enabling full 300 mW dissipation at 70 °C ambient.
Is the marking code 'K7' on the device body sufficient for full traceability to BZX384-B4V3-Q?
Yes - per Table 4 of the datasheet, 'K7' is the unique marking code assigned exclusively to BZX384-B4V3-Q in the BZX384-Q series. This allows visual identification and batch-level traceability without requiring additional packaging labels or documentation.
BZX384-B4V3-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-B4V3-QX FAQ
1.How can I place an order for BZX384-B4V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B4V3-QX 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 BZX384-B4V3-QX reliable?
The price and inventory of BZX384-B4V3-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-B4V3-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B4V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B4V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B4V3-QX?
BZX384-B4V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B4V3-QX 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 BZX384-B4V3-QX?
For technical support, including BZX384-B4V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B4V3-QX requirements.
6.How does Aetrix verify that BZX384-B4V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B4V3-QX 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 BZX384-B4V3-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B4V3-QX?
All BZX384-B4V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B4V3-QX, 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 BZX384-B4V3-QX part is unused and in its original packaging.
Return procedure for BZX384-B4V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B4V3-QX Tags
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