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Nexperia USA Inc. BZX384-B33-QX
- Part No.:
- BZX384-B33-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B33-QX.pdf
- Description:
- DIODE ZENER 33V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,242
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Product details
Overview
BZX384-B33-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 33 V nominal breakdown voltage at 2 mA test current, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides stable reference voltage in low-power biasing, overvoltage protection, and voltage-clamping circuits.
For engineers reviewing the BZX384-B33-QX datasheet, BZX384-B33-QX pinout, BZX384-B33-QX application, or BZX384-B33-QX equivalent, this page delivers verified electrical parameters, thermal behavior, automotive qualification status, and real-world design context - all extracted from Nexperia's official Rev. 1 product data sheet dated 6 September 2021.
Technical Context
This device operates as a two-terminal silicon Zener diode with reverse-biased avalanche breakdown at 33 V (±2 %), specified at IZ = 2 mA. Its differential resistance is ≤325 Ω at IZ = 2 mA, and temperature coefficient is +0.05 mV/K, indicating minimal drift across operating temperature.
Designed for surface-mount applications on FR4 PCBs, it supports non-repetitive peak reverse power up to 40 W (100 μs pulse), junction temperature up to 150 °C, and ambient range from −65 °C to +150 °C - meeting automotive-grade reliability requirements per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 33 V nominal at IZ = 2 mA; ±2 % tolerance ensures precise voltage reference in regulation loops |
| Total Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C on FR4 PCB; defines maximum continuous DC power handling |
| Differential Resistance rdif | ≤325 Ω at IZ = 2 mA; determines output impedance and regulation stiffness under load variation |
| Reverse Current IR | ≤80 μA at VR = 26.4 V (80 % of VZ); specifies leakage level before breakdown onset |
| Non-repetitive Peak Power | 40 W for 100 μs pulses; enables transient overvoltage suppression without failure |
| Junction Temperature Tj | 150 °C maximum; sets upper thermal limit for sustained operation in engine bay or power modules |
| AEC-Q101 Qualified | Yes - validated for automotive applications including body control modules and sensor interfaces |
Pinout & Package
Package: SOD323 (SC-76), 2-pin surface-mount plastic package with cathode marked by bar on top surface. Dimensions: 1.8 mm × 1.35 mm × 0.95 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; polarity mark (bar) identifies this terminal on PCB silkscreen |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias configuration requires anode at lower voltage than cathode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and infotainment systems requiring extended temperature and reliability compliance |
| ±2 % voltage tolerance | Enables tighter regulation than ±5 % variants, reducing need for post-regulation trimming in precision analog circuits |
| Low thermal resistance Rth(j-sp) | 110 K/W to solder point - improves heat transfer to PCB copper, supporting higher pulse energy handling |
| Small SOD323 footprint | 1.8 mm × 1.35 mm area saves board space in compact ECUs and ADAS sensor nodes |
| 40 W non-repetitive surge rating | Withstands ISO 7637-2 pulse 1/2a/2b transients common in 12 V vehicle electrical systems |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Voltage reference for microcontroller ADC input scaling in door module MCU. IC Role / Device Role / Timing Role: Zener diode provides stable 33 V reference to divide battery voltage for 0–5 V ADC input range. Use Value: ±2 % tolerance ensures <±0.1 V error in scaled measurement, critical for accurate window position detection. |
Use Scenario: Overvoltage clamp protecting 24 V industrial pressure transducer output stage. IC Role / Device Role / Timing Role: Connected across transducer output to shunt surges above 33 V to ground. Use Value: 40 W pulse rating absorbs 100 μs transients without degradation, preserving signal integrity during ESD events. |
| Consumer Power Adapter Feedback | Medical Equipment Bias Supply |
|
Use Scenario: Secondary-side voltage reference in flyback converter feedback loop for USB-C PD adapter. IC Role / Device Role / Timing Role: Sets regulation threshold for optocoupler-driven primary-side controller via TL431 reference divider. Use Value: Low 325 Ω dynamic impedance minimizes load-induced output voltage shift, improving cross-regulation. |
Use Scenario: Stable bias supply for op-amp front-end in portable ECG amplifier. IC Role / Device Role / Timing Role: Provides clean 33 V rail for high-gain instrumentation amplifier stages requiring low-noise reference. Use Value: 80 μA max reverse leakage at 26.4 V prevents loading of high-impedance sensor nodes, maintaining SNR > 95 dB. |
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-B33-Q | Same electrical specs and AEC-Q101 qualification; differs only in marking code (N0 vs QX) and packaging variant | No functional difference; both support identical automotive and industrial use cases | Select BZX384-B33-QX when traceability to specific production lot or tape-and-reel configuration is required |
| MMSZ5261B-TP | 33 V ±5 % tolerance, 500 mW Ptot, SOD-123 package; higher power but looser tolerance and no AEC-Q101 certification | Suitable for non-automotive consumer power supplies where cost and power margin outweigh precision needs | Choose only if AEC-Q101 compliance is not required and board layout allows larger SOD-123 footprint |
Compared with BZX384-B33-QX, the BZX384-B33-Q offers identical performance with alternate packaging logistics, while MMSZ5261B-TP trades automotive qualification and tight tolerance for higher power and lower cost - making it unsuitable for safety-critical or precision automotive functions.
Availability
BZX384-B33-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and medical equipment biasing requiring stable component supply, AEC-Q101 compliance, and tight voltage tolerance.
Supply support for BZX384-B33-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 automotive-qualified Zener diode portfolio, engineered specifically for robust voltage reference and clamping in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage before breakdown for BZX384-B33-QX?
The rated breakdown voltage is 33 V at IZ = 2 mA, with guaranteed minimum and maximum values of 32.3 V and 33.7 V respectively (±2 %). At 80 % of VZ (26.4 V), reverse current remains ≤80 μA - confirming stable non-conduction below the knee voltage.
Can BZX384-B33-QX be used in place of a 30 V Zener diode?
No - substituting a 33 V Zener for a 30 V part alters regulation setpoint by 10 %, potentially causing overvoltage stress on downstream ICs or violating feedback loop stability margins. Always match nominal VZ within system tolerance budgets.
Is thermal derating required above 25 °C ambient?
Yes - total power dissipation must be linearly reduced above 25 °C using Rth(j-a) = 415 K/W. For example, at 85 °C ambient, maximum allowable Ptot drops to approximately 165 mW to maintain Tj ≤ 150 °C.
Does the marking code 'N0' confirm this is a BZX384-B33-Q device?
Yes - per Table 4 in the datasheet, 'N0' is the official marking code for BZX384-B33-Q. The '-QX' suffix denotes a specific tape-and-reel packaging variant compliant with J-STD-020 moisture sensitivity level 1, with identical electrical and thermal characteristics.
BZX384-B33-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):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 23.1 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-B33-QX FAQ
1.How can I place an order for BZX384-B33-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B33-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-B33-QX reliable?
The price and inventory of BZX384-B33-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-B33-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B33-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B33-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B33-QX?
BZX384-B33-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B33-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-B33-QX?
For technical support, including BZX384-B33-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B33-QX requirements.
6.How does Aetrix verify that BZX384-B33-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B33-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-B33-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B33-QX?
All BZX384-B33-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B33-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-B33-QX part is unused and in its original packaging.
Return procedure for BZX384-B33-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B33-QX Tags
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MM5Z5V1ST1G
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