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Nexperia USA Inc. BZX384-A33X
- Part No.:
- BZX384-A33X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A33X.pdf
- Description:
- DIODE ZENER 33V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,871
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Product details
Overview
BZX384-A33X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 33 V nominal breakdown voltage at 5 mA, 300 mW total power dissipation, and 150 °C maximum junction temperature. It provides stable reference voltage in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.
For engineers reviewing the BZX384-A33X datasheet, BZX384-A33X pinout, BZX384-A33X application, or BZX384-A33X equivalent, key selection criteria include its 33 V ±1 % Zener voltage tolerance, 325 Ω max differential resistance at 2 mA, 80 μA reverse current at 25.1 V, and thermal resistance of 415 K/W in free air - all critical for precision biasing and compact PCB layout.
Technical Context
This discrete Zener diode operates in reverse-bias breakdown mode to maintain a stable DC reference voltage across its terminals. Its 33 V nominal Zener voltage is specified at IZ = 2 mA with ±1 % tolerance, and exhibits a positive temperature coefficient of +0.05 mV/K, minimizing drift over temperature in regulated supplies.
The device supports non-repetitive peak reverse power dissipation up to 40 W for 100 μs pulses and delivers 0.9 V forward voltage at 10 mA. Its SOD323 package enables high-density mounting while maintaining thermal performance via 110 K/W junction-to-solder-point resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.67 V to 33.33 V at IZ = 2 mA - ensures tight regulation within ±1 % for precision reference applications |
| Differential Resistance (rdif) | ≤325 Ω at IZ = 2 mA - limits output impedance and improves load regulation stability |
| Reverse Current (IR) | ≤80 μA at VR = 25.1 V - guarantees low leakage below breakdown, critical for battery-powered circuits |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - defines continuous operating limit under standard board conditions |
| Junction Temperature (Tj) | −65 °C to +150 °C - supports industrial ambient operation without derating below −40 °C or above +85 °C |
| Thermal Resistance (Rth(j-a)) | 415 K/W in free air - determines self-heating rise per watt, essential for thermal margin calculation |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - enables transient surge clamping in ESD or inductive kick protection |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package with 2 leads, 1.35 mm × 0.85 mm body size, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to higher-potential node in reverse-bias configuration; marking bar identifies this terminal |
| 2 | Anode (A) | Connected to lower-potential node (e.g., ground or return path); completes Zener conduction path |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % Zener voltage tolerance | Enables direct replacement in high-accuracy feedback networks without trimming resistors |
| 300 mW power rating in SOD323 | Supports regulation in space-constrained consumer and industrial PCBs without heatsinking |
| Low 80 μA reverse leakage at 76 % VZ | Reduces standby current in always-on monitoring circuits and extends battery life |
| +0.05 mV/K temperature coefficient | Minimizes voltage drift over −40 °C to +125 °C, improving long-term stability in unregulated environments |
| 40 W non-repetitive surge capability | Provides robustness against inductive switching transients and ESD events without external TVS |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived auxiliary supplies. IC Role / Device Role / Timing Role: Zener diode provides reference voltage to optocoupler input or error amplifier feedback node. Use Value: ±1 % VZ tolerance eliminates need for post-production calibration, reducing test time and cost. |
Use Scenario: Protecting microcontroller I/O pins from accidental 36 V surges in 24 V industrial control systems. IC Role / Device Role / Timing Role: Clamps transient voltage to 33 V before it reaches sensitive CMOS inputs. Use Value: 40 W pulse rating absorbs 100 μs inductive spikes without degradation, extending system reliability. |
| Reference Voltage Source | Current Limiter Bias |
|
Use Scenario: Generating stable 33 V reference for ADC voltage scaling or DAC output buffering. IC Role / Device Role / Timing Role: Acts as passive two-terminal voltage reference in analog front-end signal chains. Use Value: 325 Ω dynamic impedance ensures <10 mV shift under 30 μA load variation, preserving measurement accuracy. |
Use Scenario: Setting gate bias for constant-current LED driver MOSFETs in signage lighting. IC Role / Device Role / Timing Role: Establishes fixed VGS threshold via resistor divider anchored to 33 V Zener. Use Value: Low 80 μA leakage prevents unintended turn-on during standby, ensuring zero-current shutdown state. |
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 | ±2 % tolerance (32.3 V–33.7 V), same package and Ptot | Acceptable where ±2 % regulation suffices; lower cost for non-critical references | Select when budget constraints outweigh precision requirements and board space allows minor recalibration |
| MMSZ4702T1G | 33 V ±5 %, SOD-123 package, 500 mW rating, higher leakage (≤100 μA at 25.1 V) | Higher power handling but looser tolerance and larger footprint; less suitable for dense layouts | Choose only if 500 mW continuous dissipation is mandatory and ±5 % VZ is acceptable |
Compared with BZX384-B33 and MMSZ4702T1G, the BZX384-A33X uniquely balances ±1 % precision, SOD323 compactness, and 300 mW capability - making it optimal for high-density, accuracy-sensitive regulation where thermal and space budgets are constrained.
Availability
BZX384-A33X is available at Aetrix Electronics and suitable for power supply feedback, overvoltage clamp, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-term obsolescence management.
Supply support for BZX384-A33X 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 leading global semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-performance, energy-efficient logic, analog, and discrete components.
The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered for low-power voltage regulation in space-constrained, cost-sensitive industrial and consumer electronics.
FAQ
What is the maximum continuous reverse current the BZX384-A33X can sustain?
The BZX384-A33X is not rated for continuous reverse current; it operates in Zener breakdown mode with a maximum average power dissipation of 300 mW. At 33 V, this corresponds to approximately 9.1 mA continuous Zener current under ideal thermal conditions. Exceeding this requires active thermal management or derating per the Rth(j-a) curve.
Can BZX384-A33X be used in place of a 33 V TL431 shunt regulator?
No - the BZX384-A33X is a passive two-terminal Zener diode, while the TL431 is an active three-terminal programmable shunt regulator with adjustable output and higher accuracy. The BZX384-A33X lacks current-sinking capability, temperature compensation, and reference pin flexibility required for TL431 replacement.
Is the cathode marking visible on the BZX384-A33X physical package?
Yes - the cathode is identified by a distinct marking bar on the top surface of the SOD323 package, aligned with pin 1 per the official Nexperia pinning diagram. This bar is laser-marked and clearly visible under 10× magnification during visual inspection or automated optical alignment.
Does BZX384-A33X meet automotive qualification standards?
No - per Nexperia's Rev. 4 datasheet, the BZX384-A33X is explicitly designated as non-automotive qualified. It has not undergone AEC-Q200 stress testing or automotive-grade process controls. For automotive use, Nexperia offers separate -Q qualified variants such as the BZX384-Q series.
BZX384-A33X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- 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):
- 40 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-A33X FAQ
1.How can I place an order for BZX384-A33X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A33X 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-A33X reliable?
The price and inventory of BZX384-A33X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-A33X is usually 5 days.
3.What payment methods are accepted for BZX384-A33X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A33X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A33X?
BZX384-A33X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A33X 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-A33X?
For technical support, including BZX384-A33X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A33X requirements.
6.How does Aetrix verify that BZX384-A33X is sourced from the original manufacturer or authorized distributors?
All BZX384-A33X 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-A33X meets industry standards.
7.What is the process for return or replacement of BZX384-A33X?
All BZX384-A33X units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A33X, 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-A33X part is unused and in its original packaging.
Return procedure for BZX384-A33X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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