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Nexperia USA Inc. PDZ18B-QX
- Part No.:
- PDZ18B-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ18B-QX.pdf
- Description:
- DIODE ZENER 18V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:8,970
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Product details
Overview
PDZ18B-QX 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 17.56–18.35 V at IZ = 5 mA, ±2 % tolerance, 80 Ω maximum differential resistance, 0.05 μA reverse current at VR = 13 V, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the PDZ18B-QX datasheet, PDZ18B-QX pinout, PDZ18B-QX application, or PDZ18B-QX equivalent, this device supports stable reference generation in power supply feedback loops, overvoltage clamping in sensor interfaces, and ESD-protected bias networks where tight voltage accuracy and low leakage at elevated temperatures are required.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its cathode-anode terminals. Its hard breakdown knee and low dynamic impedance (≤80 Ω at 5 mA) ensure minimal voltage deviation under varying load currents, while the −14.4 mV/K temperature coefficient enables predictable drift compensation in thermal-stable designs.
Designed for surface-mount use in SOD323 (SC-76) packages, it delivers 400 mW total power dissipation on FR4 PCBs and sustains non-repetitive surge currents up to 1.5 A (tp = 100 μs), making it suitable for transient suppression in 12 V/24 V automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.56–18.35 V at IZ = 5 mA - defines precise regulation point for 18 V rail stabilization |
| Differential Resistance (rdif) | ≤80 Ω - ensures <160 mV output shift per 2 mA load change, critical for feedback accuracy |
| Reverse Current (IR) | ≤0.05 μA at VR = 13 V - enables ultra-low standby power in always-on circuits |
| Temperature Coefficient (SZ) | −14.4 mV/K - allows predictable thermal drift modeling in ambient ranges up to +125 °C |
| Total Power Dissipation (Ptot) | 400 mW at Tamb ≤ 25 °C - supports continuous operation in compact layouts with standard FR4 copper |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - confirms low-loss forward conduction during polarity-reversal protection |
| Junction Temperature (Tj) | +150 °C max - validates reliability in engine-control unit (ECU) and body electronics environments |
Pinout & Package
PDZ18B-QX is housed in a SOD323 (SC-76) plastic surface-mount package measuring 1.8 × 1.35 × 0.95 mm, with a cathode-marking bar on the top surface. The package supports reflow and wave soldering using standardized footprints per Nexperia's SOD323 layout guidelines.
| 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 ground or lower-potential rail; completes bias path for controlled conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 |
| ±2 % Zener voltage tolerance | Reduces need for post-production trimming in voltage reference circuits |
| Hard breakdown knee | Enables sharp turn-on behavior for accurate clamping without soft saturation effects |
| Low leakage (0.05 μA @ 13 V) | Minimizes quiescent current draw in battery-backed systems and low-power sensors |
| SOD323 footprint compatibility | Supports high-density PCB layouts with industry-standard 0.6 mm pad spacing and 1.15 mm lead pitch |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Regulating 5 V reference for LIN transceiver bias and microcontroller ADC reference in BCM subassemblies. IC Role / Device Role / Timing Role: Zener diode provides stable shunt reference voltage independent of input rail fluctuations. Use Value: Maintains <±10 mV reference stability over −40 °C to +105 °C ambient, meeting ISO 16750-2 pulse test requirements. |
Use Scenario: Clamping analog output of 4–20 mA current-loop pressure sensors to prevent overvoltage damage to downstream op-amps. IC Role / Device Role / Timing Role: Acts as bidirectional overvoltage protector by conducting above 18 V and blocking below 13 V. Use Value: Limits transient excursions to <18.5 V with <0.05 μA leakage, preserving signal integrity in 24 V industrial fieldbus nodes. |
| USB-C Power Delivery Feedback Network | Smart Meter Voltage Reference |
|
Use Scenario: Setting precise 18 V threshold in USB-C PD sink controller feedback loop for programmable power supply negotiation. IC Role / Device Role / Timing Role: Shunt regulator establishes fixed voltage divider ratio for error amplifier input. Use Value: Enables ±0.36 V regulation window (2 %) across full operating temperature range, supporting USB PD 3.1 specification compliance. |
Use Scenario: Providing stable reference for metrology-grade ADC in Class 0.2 smart electricity meters operating continuously for >10 years. IC Role / Device Role / Timing Role: Low-drift Zener establishes primary voltage reference for energy measurement calibration. Use Value: −14.4 mV/K temperature coefficient allows software compensation to achieve <50 ppm/°C effective drift after calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | Same 18 V nominal Zener, but ±5 % tolerance and higher rdif (100 Ω); not AEC-Q101 qualified | Limited to commercial-grade consumer power supplies; unsuitable for automotive under-hood use | Select when cost sensitivity outweighs automotive qualification and tighter voltage control |
| MMSZ5245B-TP | 18 V nominal, ±5 % tolerance, 100 Ω rdif, 100 mW Ptot; SOD-123 package (larger footprint) | Used in space-constrained portable devices where thermal derating is less critical than board area | Choose if legacy SOD-123 layout exists and 400 mW dissipation is unnecessary |
Compared with BZX84-C18LT1G and MMSZ5245B-TP, PDZ18B-QX offers superior voltage accuracy, lower dynamic impedance, higher power handling, and automotive qualification-making it the only option suitable for safety-critical 18 V reference generation in AEC-Q101-compliant systems.
Availability
PDZ18B-QX is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, USB-C power delivery feedback networks, and smart meter voltage references requiring stable component supply with guaranteed long-term continuity.
Supply support for PDZ18B-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 specializing in high-performance, reliable discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
PDZ18B-QX belongs to the PDZ-B-Q series of AEC-Q101-qualified Zener diodes engineered specifically for robust voltage regulation in harsh-environment automotive and industrial control systems.
FAQ
What is the maximum reverse voltage (VR) that PDZ18B-QX can block before breakdown?
PDZ18B-QX maintains ≤0.05 μA reverse leakage up to 13 V, as specified in Table 8. Breakdown begins near 17.56 V at 5 mA test current, confirming its rated Zener function starts above this threshold. It is not rated for blocking beyond 13 V in non-breakdown mode.
Can PDZ18B-QX be used in parallel for higher power dissipation?
No-Zener diodes exhibit negative temperature coefficients and mismatched characteristics, causing current hogging when paralleled. The datasheet specifies 400 mW absolute maximum dissipation for a single device on FR4 PCB; higher power requires series resistor limiting or alternative topology.
Is the SOD323 package of PDZ18B-QX compatible with standard reflow profiles?
Yes-Nexperia provides validated reflow soldering footprints (Fig. 9) and recommends peak temperatures up to 260 °C for ≤30 seconds. The device meets JEDEC J-STD-020 moisture sensitivity level 1, requiring no baking prior to assembly.
How does the −14.4 mV/K temperature coefficient affect circuit performance at 125 °C ambient?
At 125 °C junction temperature, the Zener voltage shifts approximately −1.44 V from its 25 °C value (18 V nominal), resulting in ~16.56 V regulation. This predictable drift enables hardware or firmware compensation in precision reference designs.
PDZ18B-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):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 13 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
PDZ18B-QX FAQ
1.How can I place an order for PDZ18B-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ18B-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 PDZ18B-QX reliable?
The price and inventory of PDZ18B-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ18B-QX is usually 5 days.
3.What payment methods are accepted for PDZ18B-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ18B-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ18B-QX?
PDZ18B-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ18B-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 PDZ18B-QX?
For technical support, including PDZ18B-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ18B-QX requirements.
6.How does Aetrix verify that PDZ18B-QX is sourced from the original manufacturer or authorized distributors?
All PDZ18B-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 PDZ18B-QX meets industry standards.
7.What is the process for return or replacement of PDZ18B-QX?
All PDZ18B-QX units undergo pre-shipment inspection (PSI). If there is an issue with PDZ18B-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 PDZ18B-QX part is unused and in its original packaging.
Return procedure for PDZ18B-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ18B-QX Tags
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