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Nexperia USA Inc. BZX384-A11-QX
- Part No.:
- BZX384-A11-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A11-QX.pdf
- Description:
- DIODE ZENER 11V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,091
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Product details
Overview
BZX384-A11-QX from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 11 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-A11-QX datasheet, BZX384-A11-QX pinout, BZX384-A11-QX application, or BZX384-A11-QX equivalent, this part serves as a precision low-power shunt regulator in ECU power rails, sensor biasing networks, and ADC reference stabilization where tight voltage tolerance and automotive-grade reliability are required.
Technical Context
This device operates in reverse-biased Zener breakdown mode with a specified 11 V working voltage (VZ) at IZ = 5 mA, differential resistance of ≤150 Ω, and temperature coefficient of +5.4 mV/K - indicating positive thermal drift optimized for stable regulation across -65 °C to +150 °C ambient range.
It supports non-repetitive peak reverse power dissipation up to 40 W (100 μs pulse), reverse current <1 μA at VR = 9 V, and junction-to-ambient thermal resistance of 415 K/W on FR4 PCB - enabling robust transient suppression and thermal management in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 11 V nominal at IZ = 5 mA, ±1 % tolerance (10.89–11.11 V) - ensures precise voltage clamping in feedback loops. |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - defines continuous DC regulation capability on standard FR4 PCB. |
| Differential Resistance | ≤150 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity. |
| Reverse Current | <1 μA at VR = 9 V - guarantees minimal leakage in standby or low-power modes. |
| Peak Pulse Power | 40 W (100 μs square wave) - enables transient surge suppression without failure. |
| Temperature Coefficient | +5.4 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius for thermal design margining. |
| Junction Temperature | Rated to 150 °C - supports operation in under-hood automotive environments. |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 2-terminal, cathode-marked with bar, 2.3 mm × 1.35 mm footprint, 0.45 mm height, designed for reflow/wave soldering per IPC-7095.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias terminal where Zener breakdown occurs. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes current path during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD testing - eliminates need for additional qualification effort. |
| ±1 % voltage tolerance | Tighter than standard ±5 % Zeners - reduces calibration overhead in precision analog signal chains. |
| Low thermal resistance | Rth(j-sp) = 110 K/W to cathode solder point - improves heat transfer in high-density layouts. |
| Non-repetitive surge rating | 40 W peak reverse power (100 μs) - absorbs ISO 7637-2 pulse 1/2a/5a transients without derating. |
| Small SOD323 footprint | 2.3 mm × 1.35 mm area - enables placement near IC power pins for localized voltage stabilization. |
Applications
| Automotive Engine Control Unit (ECU) Power Rail Clamp | Industrial Sensor Signal Conditioning Bias |
|---|---|
Use Scenario: Clamping 12 V supply rail against load-dump transients in engine control modules. IC Role / Device Role / Timing Role: Shunt regulator providing overvoltage protection and reference stability for microcontroller LDO input. Use Value: 11 V breakdown prevents downstream IC damage during ISO 7637-2 pulse 5a (75 V/400 ms), while ±1 % tolerance maintains consistent reset thresholds. |
Use Scenario: Generating stable 11 V bias for bridge sensor excitation in pressure transducers. IC Role / Device Role / Timing Role: Precision voltage reference source for ratiometric analog front-end circuitry. Use Value: Low 150 Ω dynamic impedance minimizes output voltage shift under varying sensor loading, improving measurement repeatability. |
| Automotive Cabin Infotainment Power Sequencing | Medical Diagnostic Equipment Reference Stabilization |
Use Scenario: Regulating auxiliary 11 V rail for display backlight drivers and audio amplifiers. IC Role / Device Role / Timing Role: Low-power Zener shunt maintaining clean supply during ignition-on transitions. Use Value: AEC-Q101 qualification ensures reliability across 15-year vehicle lifecycle; 300 mW rating supports sustained operation without thermal shutdown. |
Use Scenario: Stabilizing reference voltage for 16-bit SAR ADC in portable ultrasound units. IC Role / Device Role / Timing Role: Low-drift voltage reference compensating for temperature-induced gain errors. Use Value: +5.4 mV/K coefficient allows predictable compensation in firmware; sub-1 μA leakage preserves battery life in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B11-Q | ±2 % tolerance (10.8–11.2 V), higher max IR (20 μA at VR = 9 V) | Acceptable where tighter tolerance not required; slightly higher leakage may affect ultra-low-power sleep modes | Select when cost optimization outweighs 1 % precision needs and leakage budget permits |
| MMSZ4689T1G | 11 V nominal, ±5 % tolerance, 500 mW Ptot, SOD-123 package | Larger footprint and looser tolerance; higher power enables higher-current regulation but reduces board density | Choose for legacy designs using SOD-123 or where 500 mW headroom is needed for extended pulse loads |
Compared with BZX384-B11-Q and MMSZ4689T1G, the BZX384-A11-QX delivers superior voltage accuracy and automotive qualification in the smallest footprint - making it optimal for next-generation ECU and ADAS modules where space, precision, and reliability are co-constrained.
Availability
BZX384-A11-QX is available at Aetrix Electronics and suitable for automotive ECU power management, industrial sensor biasing, infotainment system sequencing, and medical diagnostic reference stabilization requiring stable component supply across long production lifecycles.
Supply support for BZX384-A11-QX 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 and logic devices for automotive, industrial, and consumer markets.
The BZX384-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for precision voltage regulation and transient protection in harsh automotive environments.
FAQ
What is the maximum continuous forward current for BZX384-A11-QX?
The device is not intended for continuous forward conduction; its absolute maximum forward current is 250 mA per limiting values table, but typical operation is in reverse-biased Zener mode. Forward voltage is 0.9 V at 10 mA, rising to 1.1 V at 100 mA - forward use should be limited to brief test or ESD protection scenarios.
Can BZX384-A11-QX replace older BZX384-A11 variants without layout changes?
Yes - BZX384-A11-QX uses the identical SOD323 package with same pinning, footprint, and soldering recommendations as prior BZX384-A11 versions. The "-QX" suffix denotes enhanced automotive qualification per Rev. 1 (2021), with no mechanical or electrical changes affecting drop-in replacement.
How does the +5.4 mV/K temperature coefficient impact regulation accuracy over temperature?
At 11 V nominal, +5.4 mV/K translates to ~0.049 %/°C drift - resulting in approximately ±0.54 V change over a 100 °C range (−40 °C to +125 °C). This is fully characterized in the datasheet and can be compensated in system-level calibration if sub-1 % total accuracy is required across full temperature range.
Is thermal derating required when operating above 25 °C ambient?
Yes - total power dissipation must be linearly derated above 25 °C at 2.4 mW/°C (based on Rth(j-a) = 415 K/W). For example, at 85 °C ambient, maximum allowable Ptot drops to 156 mW. Derating ensures junction temperature remains ≤150 °C under worst-case conduction conditions.
BZX384-A11-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):
- 11 V
- Tolerance:
- ±1%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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-A11-QX FAQ
1.How can I place an order for BZX384-A11-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A11-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-A11-QX reliable?
The price and inventory of BZX384-A11-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-A11-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A11-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A11-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A11-QX?
BZX384-A11-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A11-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-A11-QX?
For technical support, including BZX384-A11-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A11-QX requirements.
6.How does Aetrix verify that BZX384-A11-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A11-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-A11-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A11-QX?
All BZX384-A11-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A11-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-A11-QX part is unused and in its original packaging.
Return procedure for BZX384-A11-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A11-QX Tags
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