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Nexperia USA Inc. PDZ33B-QZ
- Part No.:
- PDZ33B-QZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ33B-QZ.pdf
- Description:
- DIODE ZENER 33V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,444
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Product details
Overview
PDZ33B-QZ from Nexperia is a single Zener diode designed for precision voltage regulation in low-power automotive and industrial circuits, with a nominal Zener voltage of 33 V (min 32.15 V, max 33.79 V at IZ = 5 mA), ±2 % tolerance, 400 mW total power dissipation, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the PDZ33B-QZ datasheet, PDZ33B-QZ pinout, PDZ33B-QZ application, or PDZ33B-QZ equivalent, this device serves as a surface-mount voltage reference in power supply feedback loops, overvoltage clamping, and ESD-protected sensor biasing where stable 33 V regulation at low current (5 mA) and low leakage (<0.05 µA at VR = 25 V) are required.
Technical Context
This Zener diode operates in reverse breakdown mode with a hard knee characteristic, optimized for stable regulation at IZ = 5 mA. Its differential resistance is 250 Ω (max) and temperature coefficient is +29.7 mV/K (typ) - indicating positive thermal drift suitable for compensation in bias networks.
Thermal performance is defined for FR4 PCB mounting: junction-to-solder-point thermal resistance is 130 K/W, and junction-to-ambient is 340 K/W. Maximum non-repetitive peak reverse current is 0.9 A (tp = 100 µs), supporting transient suppression in 12 V/24 V automotive systems.
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 rail stabilization |
| Differential Resistance rdif | 250 Ω max at IZ = 5 mA - determines output impedance and regulation sensitivity to load current changes |
| Reverse Leakage IR | ≤ 0.05 µA at VR = 25 V - ensures minimal quiescent current in high-impedance bias networks |
| Total Power Dissipation Ptot | 400 mW at Tamb ≤ 25 °C - sets maximum continuous DC or pulsed power handling on standard FR4 PCB |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - enables use as low-drop rectifier or polarity protection diode in auxiliary paths |
| Thermal Resistance Rth(j-sp) | 130 K/W - quantifies junction-to-solder-point heat transfer efficiency for thermal design margining |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per AEC standard |
Pinout & Package
PDZ33B-QZ is housed in an SOD323 (SC-76) plastic surface-mount package measuring 1.8 mm × 1.35 mm × 0.95 mm, with cathode marked by a bar on the top surface. The package supports reflow and wave soldering using standardized footprints per Nexperia's recommended land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential reference; completes reverse-bias path for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance at 5 mA | 250 Ω max enables tight voltage regulation under varying load conditions in feedback networks |
| Hard breakdown knee | Sharp transition into conduction improves turn-on predictability for overvoltage protection circuits |
| AEC-Q101 qualification | Validated for automotive under-hood environments including −40 °C to +150 °C operation and humidity exposure |
| Ultra-low leakage current | <0.05 µA at 25 V reverse bias preserves accuracy in high-impedance voltage divider or sensor biasing |
| SOD323 footprint compatibility | Standardized 0.65 mm pitch allows automated placement and reflow on space-constrained PCBs |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Regulating reference voltage for microcontroller ADC inputs monitoring 24 V battery rail. IC Role / Device Role / Timing Role: Zener voltage reference providing stable 33 V bias to op-amp gain-setting network. Use Value: Maintains <±0.5% reference stability across −40 °C to +125 °C due to AEC-Q101 thermal validation and low tempco drift. |
Use Scenario: Clamping amplifier input during ESD events in 4–20 mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Low-leakage Zener shunt protecting instrumentation amplifier front-end from >30 V transients. Use Value: Limits input voltage to 33.8 V (max) while drawing only 0.05 µA at 25 V, avoiding signal offset errors. |
| Power Supply Feedback Loop | LED Driver Current Reference |
|
Use Scenario: Setting output voltage in isolated flyback converter using TL431-compatible feedback divider. IC Role / Device Role / Timing Role: Precision Zener replacing TL431 in cost-sensitive low-current (<5 mA) secondary-side regulation. Use Value: Delivers 33 V reference with 250 Ω dynamic impedance, enabling ±1% output tolerance without additional compensation. |
Use Scenario: Establishing constant current for high-brightness LED string in automotive interior lighting. IC Role / Device Role / Timing Role: Zener-based current sense reference in linear LED driver IC feedback path. Use Value: Stable 33 V clamp ensures consistent 20 mA LED current despite 12 V supply ripple, verified at 150 °C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33 | Same 33 V nominal, but ±5 % tolerance and higher rdif (600 Ω max); SOT-23 package (larger footprint) | Lacks AEC-Q101 qualification; not rated for automotive under-hood use | Select when cost is primary constraint and automotive qualification is unnecessary |
| MMSZ5256ET1G | 33 V nominal, ±5 % tolerance, 500 mW Ptot, but higher leakage (1 µA at 25 V) and no AEC-Q101 certification | Suitable for commercial-grade power supplies but fails automotive thermal cycling requirements | Prefer for industrial non-automotive designs requiring higher power margin at expense of leakage and qualification |
Compared with BZX84-C33 and MMSZ5256ET1G, PDZ33B-QZ provides tighter tolerance (±2 % vs ±5 %), lower leakage (0.05 µA vs ≥1 µA), and AEC-Q101 validation - making it the sole choice for automotive-critical 33 V reference and clamping where long-term reliability under thermal stress is mandatory.
Availability
PDZ33B-QZ is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, isolated power supply feedback loops, and LED driver reference circuits requiring stable component supply with full traceability and lifecycle support.
Supply support for PDZ33B-QZ 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 specializing in high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
PDZ33B-QZ belongs to the PDZ-B-Q series of AEC-Q101-qualified Zener diodes engineered specifically for robust voltage regulation and transient clamping in automotive power systems and industrial control electronics.
FAQ
What is the maximum reverse voltage PDZ33B-QZ can withstand before breakdown?
The Zener voltage range is specified as 32.15 V to 33.79 V at IZ = 5 mA, meaning breakdown begins within that band. It is not rated for sustained operation above 33.79 V in regulation mode. Absolute maximum reverse voltage is not defined separately - operation beyond VZ(max) risks thermal runaway if power dissipation exceeds 400 mW.
Can PDZ33B-QZ be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing spread in VZ, causing current hogging when paralleled. Even matched units risk thermal instability due to positive temperature coefficient (+29.7 mV/K). For higher power, use a single higher-rated Zener or switch to an active regulator topology.
Is the SOD323 package compatible with standard reflow profiles?
Yes - Nexperia specifies compatibility with IPC/JEDEC J-STD-020D reflow profiles. Peak temperature must not exceed 260 °C, and time above 217 °C should be 60–150 seconds. Recommended solder land pattern matches Figure 9 in the datasheet (0.6 mm × 0.5 mm pads, 0.65 mm pitch).
How does the +29.7 mV/K temperature coefficient affect circuit performance?
This positive coefficient means VZ increases ~30 mV per °C rise in junction temperature. In feedback networks, it can offset negative tempcos of other components (e.g., op-amps), improving overall system stability. However, in precision references, it requires derating or compensation - e.g., pairing with NTC thermistors in bias dividers.
PDZ33B-QZ 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-QZ FAQ
1.How can I place an order for PDZ33B-QZ through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ33B-QZ 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-QZ reliable?
The price and inventory of PDZ33B-QZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ33B-QZ is usually 5 days.
3.What payment methods are accepted for PDZ33B-QZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ33B-QZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ33B-QZ?
PDZ33B-QZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ33B-QZ 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-QZ?
For technical support, including PDZ33B-QZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ33B-QZ requirements.
6.How does Aetrix verify that PDZ33B-QZ is sourced from the original manufacturer or authorized distributors?
All PDZ33B-QZ 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-QZ meets industry standards.
7.What is the process for return or replacement of PDZ33B-QZ?
All PDZ33B-QZ units undergo pre-shipment inspection (PSI). If there is an issue with PDZ33B-QZ, 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-QZ part is unused and in its original packaging.
Return procedure for PDZ33B-QZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ33B-QZ Tags
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