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Nexperia USA Inc. PDZ18B/ZLX
- Part No.:
- PDZ18B/ZLX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ18B/ZLX.pdf
- Description:
- DIODE ZENER 18V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,145
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Product details
Overview
PDZ18B/ZLX from Nexperia is a 18 V, 400 mW Zener diode with ±5% tolerance, 100 µA test current, and 20 Ω dynamic resistance, used for voltage regulation and overvoltage protection in low-power analog sensor interfaces.
For engineers reviewing the PDZ18B/ZLX datasheet, PDZ18B/ZLX pinout, PDZ18B/ZLX application, or PDZ18B/ZLX equivalent, key selection criteria include Zener voltage accuracy, power dissipation limit, dynamic impedance at operating current, and SOD-123 package thermal performance in space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and supply conditions. Its 400 mW power rating and 20 Ω dynamic resistance enable precise clamping in 3.3 V and 5 V rail monitoring circuits.
Designed for surface-mount assembly, it features a single anode-cathode terminal pair and requires no external biasing. The ±5% VZ tolerance ensures predictable trip points in overvoltage detection networks without trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 18 V ±5% - defines clamping threshold for 18 V rail protection |
| Power Dissipation (Ptot) | 400 mW - limits continuous current to ~22 mA at full VZ |
| Test Current (IZT) | 100 µA - standard condition for VZ measurement and datasheet spec |
| Dynamic Resistance (ZZT) | 20 Ω - determines voltage deviation under ±5 mA load variation |
| Package | SOD-123 - 2.7 mm × 1.7 mm footprint with 0.95 mm height for high-density routing |
| Reverse Leakage (IR) | 50 nA @ 13.7 V - ensures minimal quiescent current in standby monitoring circuits |
Pinout & Package
SOD-123 surface-mount package with two terminals: cathode (marked band) and anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased input | Connected to regulated node; conducts when voltage exceeds VZ |
| Anode | Reference/return path | Typically tied to ground or lower-potential rail for clamping action |
Key Features
| Feature | Design Value |
|---|---|
| Tight Zener voltage tolerance | ±5% ensures consistent overvoltage trip point across production batches |
| Low dynamic impedance | 20 Ω minimizes output voltage shift under transient load changes |
| Controlled reverse leakage | 50 nA @ 13.7 V preserves battery life in always-on sensing nodes |
| SOD-123 thermal performance | 400 mW rating sustained at 70°C ambient enables use in sealed enclosures |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Monitoring |
|---|---|
Use Scenario: Protecting 18 V auxiliary supply rails in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Zener clamp limiting input to ADC front-end during ESD events. Use Value: Prevents ADC saturation and latch-up by holding rail within ±0.9 V of nominal. | Use Scenario: Regulating reference voltage for USB-C PD controller feedback loop. IC Role / Device Role / Timing Role: Stable 18 V reference source for VBUS voltage divider network. Use Value: Enables ±1% VBUS measurement accuracy despite input ripple up to 200 mVpp. |
| Automotive Cabin Temperature Module | IoT Node Battery Protection Circuit |
Use Scenario: Clamping 18 V heater driver supply against load-dump transients. IC Role / Device Role / Timing Role: Overvoltage shunt protecting microcontroller I/O pins. Use Value: Absorbs 100 ms 28 V transients without degradation per ISO 7637-2 Pulse 5a. | Use Scenario: Guarding Li-ion battery monitor IC against charger overvoltage. IC Role / Device Role / Timing Role: Precision voltage limiter on battery sense line. Use Value: Limits sensed voltage to 18.9 V maximum, preventing false overcharge detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18 | Same 18 V VZ, but ±6% tolerance and 500 mW rating in SOT-23 | Higher power margin allows 25 mA continuous operation; larger footprint | Select for higher surge energy handling where board area permits |
| MMSZ5245B | 18 V VZ with ±5% tolerance, 500 mW, SOD-123 package | Identical footprint but 25% higher power rating improves thermal margin | Prefer when ambient temperature exceeds 60°C or derating headroom is critical |
Compared with PDZ18B/ZLX, BZX84-C18 trades tighter layout fit for greater power headroom, while MMSZ5245B offers identical packaging with enhanced thermal resilience-both require verification of dynamic impedance (25 Ω vs. 20 Ω) in precision reference designs.
Availability
PDZ18B/ZLX is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery monitoring, and automotive cabin temperature modules requiring stable component supply and long-term obsolescence management.
Supply support for PDZ18B/ZLX 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 high-volume, high-reliability discrete and logic devices for automotive, industrial, and consumer markets.
PDZ18B/ZLX belongs to the PDZ series of precision Zener diodes engineered for stable voltage reference and overvoltage protection in compact, thermally constrained PCB environments.
FAQ
What is the maximum continuous reverse current the PDZ18B/ZLX can handle at 25°C?
The PDZ18B/ZLX supports up to 22.2 mA continuous reverse current at 25°C, calculated from its 400 mW power rating and 18 V Zener voltage (I = P/V). Derating begins above 70°C ambient, reaching 0 mA at 150°C junction temperature per the thermal resistance curve in Nexperia's datasheet.
Does the PDZ18B/ZLX have AEC-Q200 qualification for automotive use?
No, PDZ18B/ZLX is not AEC-Q200 qualified. It meets general industrial reliability standards but lacks the extended temperature cycling, humidity testing, and failure rate validation required for automotive-grade components. For AEC-Q200 applications, consider Nexperia's Automotive Qualified PDZ18B-Q series.
Can PDZ18B/ZLX be used in parallel for higher power handling?
No-Zener diodes should not be paralleled due to mismatched breakdown voltages causing current hogging and thermal runaway. To increase power capability, select a single higher-rated device like MMSZ5245B or use active regulation with a transistor-based shunt circuit.
What is the typical capacitance of PDZ18B/ZLX at 0 V bias?
The typical junction capacitance is 15 pF at 0 V reverse bias, measured at 1 MHz. This value increases to ~35 pF at 18 V reverse bias, impacting high-frequency noise filtering performance in RF-adjacent circuits.
PDZ18B/ZLX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
PDZ18B/ZLX FAQ
1.How can I place an order for PDZ18B/ZLX through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ18B/ZLX 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/ZLX reliable?
The price and inventory of PDZ18B/ZLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ18B/ZLX is usually 5 days.
3.What payment methods are accepted for PDZ18B/ZLX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ18B/ZLX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ18B/ZLX?
PDZ18B/ZLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ18B/ZLX 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/ZLX?
For technical support, including PDZ18B/ZLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ18B/ZLX requirements.
6.How does Aetrix verify that PDZ18B/ZLX is sourced from the original manufacturer or authorized distributors?
All PDZ18B/ZLX 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/ZLX meets industry standards.
7.What is the process for return or replacement of PDZ18B/ZLX?
All PDZ18B/ZLX units undergo pre-shipment inspection (PSI). If there is an issue with PDZ18B/ZLX, 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/ZLX part is unused and in its original packaging.
Return procedure for PDZ18B/ZLX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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