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Nexperia USA Inc. BZX384-A33-QX
- Part No.:
- BZX384-A33-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A33-QX.pdf
- Description:
- DIODE ZENER 33V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,620
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Product details
Overview
BZX384-A33-QX from Nexperia is a ±1 % 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 supply regulation and overvoltage protection circuits.
For engineers reviewing the BZX384-A33-QX datasheet, BZX384-A33-QX pinout, BZX384-A33-QX application, or BZX384-A33-QX equivalent, key selection criteria include its 33 V ±1 % Zener voltage tolerance, 325 Ω max differential resistance at 2 mA, 80 μA max reverse leakage at 25.1 V, and AEC-Q101 qualification for under-hood automotive electronics.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining regulated output by conducting reverse current above its specified Zener voltage. Its 33 V nominal breakdown is defined at IZ = 2 mA with ±1 % initial tolerance and temperature coefficient of +0.05 mV/K.
Designed for surface-mount applications on FR4 PCBs, it delivers 300 mW steady-state power dissipation at Tamb ≤ 25 °C and withstands non-repetitive 40 W surge pulses (tp = 100 μs), enabling robust transient suppression in compact automotive and industrial modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.67 V to 33.33 V at IZ = 2 mA - ensures precise 33 V reference with ±1 % accuracy for stable feedback loops |
| Differential Resistance (rdif) | ≤325 Ω at IZ = 2 mA - limits output voltage variation under load changes in regulation circuits |
| Reverse Leakage (IR) | ≤80 μA at VR = 25.1 V - minimizes standby current in battery-powered systems |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - supports continuous operation in space-constrained PCB layouts |
| Non-repetitive Peak Power | 40 W for 100 μs - enables clamping of ESD and load-dump transients in automotive ECUs |
| Junction Temperature | −65 °C to +150 °C - allows deployment in engine control units and under-hood sensors |
| AEC-Q101 Qualified | Yes - certified for automotive-grade reliability per stress-test qualification standard |
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 indicates cathode side for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt path when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables high-accuracy voltage references without external trimming in ADAS sensor interfaces |
| AEC-Q101 qualification | Validates reliability for automotive power management in engine control, lighting, and body electronics |
| 300 mW power rating in SOD323 | Delivers usable regulation headroom while fitting into ultra-compact 1.8 mm × 1.35 mm footprints |
| 40 W non-repetitive surge capability | Clamps ISO 7637-2 load-dump transients up to 120 V without failure in 12 V vehicle systems |
| Low thermal resistance (110 K/W j-to-solder point) | Supports sustained power dissipation with minimal board-level copper area in thermally constrained modules |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating reference voltage for analog-to-digital converters monitoring throttle position and oxygen sensors. IC Role / Device Role / Timing Role: Shunt Zener reference providing stable 33 V bias to op-amp gain stages and ADC reference dividers. Use Value: ±1 % tolerance ensures <0.33 V error in 33 V reference, preserving 12-bit measurement linearity across −40 °C to +125 °C. |
Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Precision shunt regulator maintaining constant 33 V supply to bridge sensor interface ICs. Use Value: 325 Ω differential resistance minimizes output droop under 1 mA load variation, sustaining loop accuracy. |
| Automotive Lighting Control Module | Consumer Appliance Power Supply Feedback |
Use Scenario: Overvoltage protection and voltage clamping for LED driver ICs in headlamp assemblies. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing ISO 16750-2 pulse 5a surges up to 120 V. Use Value: 40 W non-repetitive peak power rating handles 100 μs load-dump events without degradation. |
Use Scenario: Secondary-side voltage reference in isolated flyback SMPS for smart home hubs. IC Role / Device Role / Timing Role: Zener diode establishing feedback threshold for optocoupler-based regulation. Use Value: Low 80 μA reverse leakage at 25.1 V reduces no-load power loss, aiding Energy Star compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B33-Q | ±2 % tolerance (32.3 V–33.7 V), higher 325 Ω rdif, same package and AEC-Q101 rating | Suitable where tighter voltage accuracy is not required, e.g., non-critical biasing in infotainment power rails | Select for cost-sensitive automotive subsystems where ±2 % regulation meets functional safety requirements |
| MMSZ4702T1G | ±5 % tolerance (31.4 V–34.7 V), 350 mW Ptot, SOD-123 package, AEC-Q101 qualified | Larger footprint (2.7 mm × 1.6 mm) and looser tolerance limit use in space-constrained or precision circuits | Choose only if SOD-123 layout compatibility exists and ±5 % drift is acceptable in feedback networks |
Compared with BZX384-B33-Q and MMSZ4702T1G, the BZX384-A33-QX offers the tightest voltage accuracy (±1 %) in the smallest footprint (SOD323), making it optimal for high-density automotive control modules requiring precise, AEC-Q101-compliant regulation.
Availability
BZX384-A33-QX is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor signal conditioners, LED lighting drivers, and consumer appliance power supplies requiring stable component supply with AEC-Q101 assurance.
Supply support for BZX384-A33-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, reliability, and miniaturization.
The BZX384-Q series targets automotive and industrial voltage regulation, engineered for AEC-Q101 compliance, tight tolerances, and robust surge handling in space-constrained SMD designs.
FAQ
What is the maximum reverse voltage before breakdown for BZX384-A33-QX?
The BZX384-A33-QX exhibits a nominal Zener voltage of 33 V at 2 mA test current, with guaranteed breakdown between 32.67 V and 33.33 V. Below 25.1 V, reverse leakage remains ≤80 μA - this voltage threshold defines the practical upper limit for non-conducting operation in regulation circuits.
Can BZX384-A33-QX replace BZX384-C33-Q in an existing design?
No - BZX384-C33-Q has ±5 % tolerance (31.0 V–35.0 V) and higher 350 Ω differential resistance, resulting in greater output variation and poorer regulation stability. Substituting it for the ±1 % BZX384-A33-QX risks violating voltage accuracy requirements in precision feedback paths.
What is the thermal resistance from junction to solder point for this diode?
The thermal resistance from junction to solder point (Rth(j-sp)) is 110 K/W, measured at the cathode tab. This value enables accurate thermal modeling when mounted on standard FR4 PCBs with tin-plated copper, supporting reliable power derating up to 150 °C junction temperature.
Is BZX384-A33-QX suitable for use in a 24 V industrial power supply?
Yes - its 33 V Zener voltage provides adequate margin above 24 V nominal rails, and its 40 W non-repetitive surge rating clamps transients per IEC 61000-4-5. Combined with AEC-Q101 qualification and −65 °C to +150 °C operating range, it meets harsh industrial environment demands.
BZX384-A33-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:
- ±1%
- 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-A33-QX FAQ
1.How can I place an order for BZX384-A33-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A33-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-A33-QX reliable?
The price and inventory of BZX384-A33-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-A33-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A33-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A33-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A33-QX?
BZX384-A33-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A33-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-A33-QX?
For technical support, including BZX384-A33-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A33-QX requirements.
6.How does Aetrix verify that BZX384-A33-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A33-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-A33-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A33-QX?
All BZX384-A33-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A33-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-A33-QX part is unused and in its original packaging.
Return procedure for BZX384-A33-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A33-QX Tags
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