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Nexperia USA Inc. BZX384-A3V3-QX
- Part No.:
- BZX384-A3V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A3V3-QX.pdf
- Description:
- DIODE ZENER 3.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,797
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Product details
Overview
BZX384-A3V3-Q from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 3.3 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-A3V3-Q datasheet, BZX384-A3V3-Q pinout, BZX384-A3V3-Q application, or BZX384-A3V3-Q equivalent, this part serves as a precision low-power shunt regulator in ECU power rail monitoring, sensor biasing, and microcontroller reset circuitry where tight voltage tolerance and automotive-grade reliability are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable 3.3 V across its terminals under varying load and temperature conditions. Its ±1 % tolerance ensures minimal deviation from nominal VZ, and differential resistance of ≤95 Ω at IZ = 5 mA supports low output impedance regulation.
Qualified per AEC-Q101, it sustains junction temperatures up to 150 °C and handles non-repetitive peak reverse power surges up to 40 W (100 μs pulse), making it suitable for transient suppression in harsh automotive environments without external clamping components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 3.26 V to 3.34 V at IZ = 5 mA - defines precise regulation point for 3.3 V logic rails |
| Tolerance | ±1 % - enables accurate voltage reference without post-production trimming |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - limits thermal design to standard FR4 PCB with single-sided copper |
| Differential Resistance rdif | ≤95 Ω at IZ = 5 mA - ensures minimal output voltage shift under load current variation |
| Reverse Current IR | ≤5 μA at VR = 1 V - guarantees low leakage in standby and low-power modes |
| Non-repetitive Peak Power | 40 W (100 μs pulse) - provides inherent surge immunity against ISO 7637-2 transients |
| Junction Temperature Range | –65 °C to +150 °C - supports operation in engine bay and powertrain control units |
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 voltage node; reverse-biased terminal where breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower potential; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity testing, and mechanical shock per discrete semiconductor stress standards |
| ±1 % voltage tolerance | Reduces need for external calibration in safety-critical voltage monitoring paths such as airbag controllers or ADAS power sequencing |
| Low differential resistance (≤95 Ω) | Maintains regulation stability under dynamic load changes typical in microcontroller brown-out detection circuits |
| 40 W non-repetitive surge rating | Withstands load-dump and jump-start transients without derating or supplemental TVS devices |
| SOD323 compact footprint | Enables high-density placement on space-constrained automotive PCBs while maintaining thermal performance via solder-point conduction |
Applications
| Engine Control Unit (ECU) Reference | Automotive Sensor Biasing |
|---|---|
Use Scenario: Providing stable 3.3 V reference for analog-to-digital converters measuring throttle position and oxygen sensor signals. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precision input range for 12-bit ADCs in real-time engine management. Use Value: ±1 % VZ tolerance ensures <0.5 LSB error contribution at 3.3 V full-scale, preserving measurement fidelity across –40 °C to +125 °C. |
Use Scenario: Biasing resistive temperature detectors (RTDs) and Hall-effect sensors in transmission control modules. IC Role / Device Role / Timing Role: Low-leakage (≤5 μA) voltage source enabling accurate current sourcing into high-impedance sensor elements. Use Value: Sub-μA reverse current prevents signal offset drift in millivolt-level sensor outputs, critical for closed-loop torque control. |
| Microcontroller Reset Circuit | Infotainment Power Rail Clamp |
Use Scenario: Generating clean reset signal for ARM Cortex-M7 MCUs during cold crank and battery recovery events. IC Role / Device Role / Timing Role: Zener-based supervisor element holding reset line active until 3.3 V rail stabilizes within ±1 % window. Use Value: 95 Ω rdif ensures fast response to rail droop (<100 ns), preventing spurious resets during ignition transients. |
Use Scenario: Clamping 3.3 V USB PHY and display interface rails against ESD and conducted noise in head unit designs. IC Role / Device Role / Timing Role: Low-capacitance (≤450 pF) shunt clamp absorbing >40 W surges without degrading high-speed signal integrity. Use Value: 450 pF capacitance at 0 V bias avoids signal distortion on 480 Mbps USB 2.0 lines while meeting ISO 10605 ESD requirements. |
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-B3V3-Q | ±2 % tolerance (3.23 V–3.37 V), higher max rdif (≤100 Ω) | Acceptable for non-safety-critical biasing where cost sensitivity outweighs precision needs | Select when AEC-Q101 compliance is retained but tighter tolerance is not required for system accuracy budget |
| MMSZ4683T1G | ±5 % tolerance (3.14 V–3.47 V), 500 mW Ptot, SOD-123 package | Higher power handling but larger footprint and looser regulation; not AEC-Q101 qualified | Choose only for industrial prototypes lacking automotive qualification requirements and needing higher continuous dissipation |
Compared with BZX384-B3V3-Q and MMSZ4683T1G, the BZX384-A3V3-Q delivers superior voltage accuracy and automotive qualification at the cost of slightly lower surge margin than the MMSZ4683T1G - making it the optimal choice for production automotive electronics requiring both precision and reliability.
Availability
BZX384-A3V3-Q is available at Aetrix Electronics and suitable for engine control units, automotive sensor interfaces, microcontroller reset circuits, and infotainment power rail clamping requiring stable component supply across extended temperature ranges and automotive lifecycle demands.
Supply support for BZX384-A3V3-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 AEC-Q101-qualified Zener diode portfolio, engineered specifically for precision voltage reference and transient protection in automotive power systems where long-term stability and failure-mode predictability are mandatory.
FAQ
What is the maximum steady-state current this Zener can regulate at 3.3 V?
The BZX384-A3V3-Q supports a maximum DC forward current of 250 mA, but its regulated operation is defined at test current IZ = 5 mA. At 3.3 V, continuous regulation is limited by thermal constraints: at 25 °C ambient, 300 mW dissipation allows ~90 mA (300 mW ÷ 3.3 V), decreasing linearly with rising junction temperature per Rth(j-a) = 415 K/W.
Does this diode require a series resistor in all applications?
Yes - a current-limiting resistor is mandatory to set operating current within safe bounds. For example, with a 5 V supply and target IZ = 5 mA, a 340 Ω resistor ensures 3.3 V regulation while dissipating 8.5 mW. The resistor value must be selected to keep power dissipation below 300 mW across worst-case temperature and supply variations.
How does the temperature coefficient affect regulation accuracy over –40 °C to +125 °C?
At 3.3 V, the BZX384-A3V3-Q exhibits a temperature coefficient of –3.5 mV/K to 0.0 mV/K. Over the full automotive range, this introduces up to ±52 mV drift (165 K × 0.315 mV/K average), which is within the ±1 % initial tolerance band and remains acceptable for most bias and reference functions without active compensation.
Can this Zener replace a TL431-based shunt regulator in automotive designs?
No - the BZX384-A3V3-Q is a two-terminal passive device with fixed 3.3 V breakdown, whereas the TL431 is an adjustable three-terminal active shunt regulator with programmable threshold and higher precision. It replaces simple Zener references, not feedback-controlled regulators requiring external resistors or dynamic adjustment.
BZX384-A3V3-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):
- 3.3 V
- Tolerance:
- ±1%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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-A3V3-QX FAQ
1.How can I place an order for BZX384-A3V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A3V3-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-A3V3-QX reliable?
The price and inventory of BZX384-A3V3-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-A3V3-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A3V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A3V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A3V3-QX?
BZX384-A3V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A3V3-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-A3V3-QX?
For technical support, including BZX384-A3V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A3V3-QX requirements.
6.How does Aetrix verify that BZX384-A3V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A3V3-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-A3V3-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A3V3-QX?
All BZX384-A3V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A3V3-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-A3V3-QX part is unused and in its original packaging.
Return procedure for BZX384-A3V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A3V3-QX Tags
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