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Nexperia USA Inc. PDZ33B-QX
- Part No.:
- PDZ33B-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ33B-QX.pdf
- Description:
- DIODE ZENER 33V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,838
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Product details
Overview
PDZ33B-QX from Nexperia is a single silicon Zener diode designed for precision voltage regulation and reference in low-power circuits, with a nominal Zener voltage of 33.3 V (min 32.15 V, max 33.79 V) at IZ = 5 mA, ±2 % tolerance, 400 mW total power dissipation, and SOD323 (SC-76) surface-mount package - used in automotive ECU power rail clamping and sensor biasing.
For engineers reviewing the PDZ33B-QX datasheet, PDZ33B-QX pinout, PDZ33B-QX application, or PDZ33B-QX equivalent, this device supports stable 33 V regulation under low-current conditions (IZ = 5 mA), features hard breakdown knee and low leakage (<0.05 µA at VR = 25 V), and meets AEC-Q101 for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable reference voltage across its terminals. Its 33.3 V nominal Zener voltage is specified at 5 mA test current, with differential resistance of 250 Ω (max) and temperature coefficient of +29.7 mV/K (max) - indicating positive thermal drift optimized for mid-to-high voltage regulation.
It exhibits low dynamic impedance at low currents and a sharp breakdown knee, enabling accurate voltage clamping in feedback loops and overvoltage protection circuits. The device is qualified per AEC-Q101 and rated for junction temperatures up to +150 °C, supporting operation in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 32.15 V to 33.79 V at IZ = 5 mA - defines precise clamping threshold for 33 V rails |
| Tolerance | ±2 % - ensures tight voltage consistency across production lots for calibration-critical designs |
| Differential Resistance (rdif) | 250 Ω max at IZ = 0.5 mA - maintains regulation stability under light-load variations |
| Reverse Leakage (IR) | 0.05 µA max at VR = 25 V - minimizes standby current in battery-powered systems |
| Total Power Dissipation (Ptot) | 400 mW at Tamb ≤ 25 °C on FR4 PCB - sets thermal design boundary for compact layouts |
| Thermal Resistance (Rth(j-sp)) | 130 K/W junction-to-solder point - enables direct thermal modeling for PCB copper pour sizing |
| Temperature Coefficient (SZ) | +25.0 to +29.7 mV/K at IZ = 5 mA - quantifies voltage drift per degree for thermal compensation |
Pinout & Package
PDZ33B-QX is housed in a SOD323 (SC-76) plastic surface-mount package measuring 1.8 mm × 1.35 mm × 0.95 mm, with cathode indicated by a marking bar on the top surface. The package is optimized for reflow soldering using standard footprint dimensions (0.6 mm pad length, 0.5 mm pad width).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 (A) | Anode | Connected to circuit ground or lower-potential rail; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Hard breakdown knee | Enables sharp, predictable turn-on for reliable overvoltage clamping without soft saturation |
| Low leakage current | <0.05 µA at 25 V reverse bias - critical for ultra-low-power sensor reference circuits |
| ±2 % voltage tolerance | Reduces need for post-production trimming in precision analog supply monitoring |
| SOD323 footprint compatibility | Supports high-density PCB layouts and automated assembly with industry-standard pick-and-place |
Applications
| Automotive ECU Power Rail Clamping | Industrial Sensor Bias Reference |
|---|---|
|
Use Scenario: Protecting microcontroller I/O pins and ADC references against load-dump transients in 12 V/24 V vehicle electrical systems. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage clamp, diverting surge energy to ground when rail exceeds 33.3 V. Use Value: Prevents latch-up or damage to downstream logic with <0.05 µA leakage and 400 mW surge handling capability. |
Use Scenario: Providing stable excitation voltage for resistive temperature detectors (RTDs) in factory automation PLC modules. IC Role / Device Role / Timing Role: Precision voltage reference source maintaining 33.3 V ±2 % across temperature range −40 °C to +125 °C. Use Value: Enables <±0.1 % measurement accuracy in 4–20 mA loop transmitters due to low rdif (250 Ω max) and +29.7 mV/K thermal coefficient. |
| USB-C PD Adapter Feedback Network | Medical Instrument Overvoltage Protection |
|
Use Scenario: Setting feedback threshold in secondary-side regulation of USB-C power delivery adapters delivering up to 100 W. IC Role / Device Role / Timing Role: Zener element in optocoupler feedback divider, defining 33.3 V trigger point for isolated voltage sensing. Use Value: Ensures compliance with USB PD 3.0 voltage tolerance requirements via ±2 % VZ and minimal thermal drift. |
Use Scenario: Safeguarding analog front-end inputs of portable ECG monitors against electrostatic discharge and defibrillator-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector on signal conditioning path, clamping input to 33.3 V before op-amp stage. Use Value: Guarantees patient safety with AEC-Q101 reliability and <0.05 µA leakage to avoid DC offset errors in biopotential amplification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33 | 33 V nominal, ±5 % tolerance, 300 mW Ptot, SOT23 package | Higher voltage tolerance and lower power rating reduce precision in calibration-critical designs | Select when cost sensitivity outweighs tight regulation needs and SOT23 footprint is preferred |
| MMSZ5261B | 33 V nominal, ±5 % tolerance, 500 mW Ptot, SOD123 package | Larger SOD123 footprint and wider tolerance limit use in space-constrained automotive modules | Choose for higher surge robustness where board area permits and ±5 % VZ is acceptable |
Compared with PDZ33B-QX, BZX84-C33 offers lower cost but sacrifices voltage accuracy and automotive qualification, while MMSZ5261B provides greater power margin at the expense of footprint size and tighter tolerance - making PDZ33B-QX optimal for AEC-Q101-compliant, high-precision 33 V regulation in miniaturized designs.
Availability
PDZ33B-QX is available at Aetrix Electronics and suitable for automotive ECU power rail clamping, industrial sensor bias reference, and USB-C PD adapter feedback networks requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for PDZ33B-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.
PDZ33B-QX belongs to the PDZ-B-Q series of AEC-Q101-qualified Zener diodes engineered specifically for precision voltage regulation in harsh-environment automotive electronics and high-reliability industrial control systems.
FAQ
What is the maximum reverse voltage (VR) that PDZ33B-QX can withstand before breakdown?
PDZ33B-QX begins Zener breakdown at a minimum of 32.15 V (VZ min) when tested at IZ = 5 mA. It is not rated for continuous operation above its nominal Zener voltage - the device is intended to operate in controlled reverse breakdown, not as a blocking diode. Its absolute maximum non-repetitive peak reverse voltage is not specified separately; design must ensure current limiting to prevent thermal runaway beyond 400 mW.
Does PDZ33B-QX require external current-limiting resistance in series?
Yes - PDZ33B-QX requires a series current-limiting resistor to restrict reverse current to safe levels below its 400 mW power dissipation limit. For example, at 33.3 V regulation with 10 mA Zener current, a minimum 1 kΩ resistor is needed when biased from a 43.3 V source. Thermal derating must be applied above 25 °C ambient per the published power derating curve.
How does the +29.7 mV/K temperature coefficient affect circuit performance?
The positive temperature coefficient means VZ increases by up to 29.7 mV per Kelvin rise in junction temperature. At 100 °C junction temperature (75 °C above 25 °C reference), VZ may rise by ~2.2 V - a critical factor in high-temperature automotive applications. Designers must either compensate thermally or select operating points where drift remains within system tolerance bands.
Is PDZ33B-QX compatible with lead-free reflow soldering profiles?
Yes - PDZ33B-QX is qualified for lead-free reflow soldering per JEDEC J-STD-020. Its SOD323 package supports peak reflow temperatures up to 260 °C (10-second duration), matching standard Pb-free profiles. Recommended footprint uses 0.6 mm × 0.5 mm solder pads with 0.65 mm pitch, as defined in Nexperia's SOD323 reflow land pattern documentation.
PDZ33B-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 33 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 25 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
PDZ33B-QX FAQ
1.How can I place an order for PDZ33B-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ33B-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 PDZ33B-QX reliable?
The price and inventory of PDZ33B-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ33B-QX is usually 5 days.
3.What payment methods are accepted for PDZ33B-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ33B-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ33B-QX?
PDZ33B-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ33B-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 PDZ33B-QX?
For technical support, including PDZ33B-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ33B-QX requirements.
6.How does Aetrix verify that PDZ33B-QX is sourced from the original manufacturer or authorized distributors?
All PDZ33B-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 PDZ33B-QX meets industry standards.
7.What is the process for return or replacement of PDZ33B-QX?
All PDZ33B-QX units undergo pre-shipment inspection (PSI). If there is an issue with PDZ33B-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 PDZ33B-QX part is unused and in its original packaging.
Return procedure for PDZ33B-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ33B-QX Tags
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MMSZ4682T1G
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MM5Z5V1ST1G
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