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Nexperia USA Inc. PDZ18B-QF
- Part No.:
- PDZ18B-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ18B-QF.pdf
- Description:
- DIODE ZENER 18V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,312
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Product details
Overview
PDZ18B-QF from Nexperia is a single Zener diode in SOD323 (SC-76) package, designed for precision voltage regulation at 17.56–18.35 V nominal Zener voltage with ±2 % tolerance, 80 Ω max differential resistance at IZ = 5 mA, and AEC-Q101 qualification for automotive use.
For engineers reviewing the PDZ18B-QF datasheet, PDZ18B-QF pinout, PDZ18B-QF application, or PDZ18B-QF equivalent, this device supports low-current stabilization in ECU power rails, sensor reference circuits, and overvoltage clamping where tight voltage tolerance, low leakage (<0.05 µA at VR = 13 V), and thermal stability (SZ = +14.4 mV/K) are critical.
Technical Context
This Zener diode operates in reverse breakdown mode with hard knee characteristics, optimized for stable regulation at IZ = 5 mA. Its 80 Ω typical dynamic impedance ensures minimal output voltage variation under load changes, while the +14.4 mV/K temperature coefficient enables predictable drift compensation in temperature-sensitive analog circuits.
Designed for surface-mount assembly on FR4 PCBs with standard SOD323 footprint, it delivers 400 mW total power dissipation at Tamb ≤ 25 °C and maintains junction temperatures up to +150 °C, supported by Rth(j-a) = 340 K/W and Rth(j-sp) = 130 K/W thermal resistance values.
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 at IZ = 5 mA - ensures <100 mV output shift per 1 mA load change |
| Reverse Current (IR) | ≤0.05 µA at VR = 13 V - enables ultra-low standby power loss in always-on circuits |
| Temperature Coefficient (SZ) | +14.4 mV/K at IZ = 5 mA - allows accurate thermal drift modeling for compensated references |
| Power Dissipation (Ptot) | 400 mW at Tamb = 25 °C on FR4 PCB - supports continuous operation in compact automotive modules |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - ensures low-loss forward conduction during transient clamping |
| Junction Temperature (Tj) | −65 to +150 °C - meets extended-range requirements for engine bay and ADAS electronics |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package with 2 leads; cathode marked by bar on top surface; footprint compatible with reflow and wave soldering per Nexperia's recommended land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; polarity marking bar aligns with PCB silkscreen for automated optical inspection |
| 2 (A) | Anode | Connected to ground or lower-potential reference; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain control units and body electronics |
| ±2 % Zener voltage tolerance | Reduces need for post-assembly calibration in 18 V reference designs |
| Hard breakdown knee | Enables sharp transition into regulation, improving noise immunity in feedback paths |
| Low leakage current | <0.05 µA at 13 V reverse bias minimizes quiescent current in battery-backed systems |
| Small SOD323 footprint | 0.8 × 1.35 mm body saves board space in dense ECUs and sensor nodes |
Applications
| Automotive ECU Power Rail Clamp | Industrial Sensor Reference Stabilizer |
|---|---|
|
Use Scenario: Clamping transients on 12 V supply lines in engine control units exposed to load dump events. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp voltage spikes above 18 V. Use Value: Limits peak rail voltage to 18.35 V with <80 Ω impedance, preventing damage to downstream 16 V-rated microcontrollers. |
Use Scenario: Providing stable 18 V reference for analog-to-digital conversion in pressure sensors. IC Role / Device Role / Timing Role: Precision voltage reference source with +14.4 mV/K tempco for calibrated offset correction. Use Value: Enables <±0.5 % full-scale accuracy over −40 to +125 °C without external trimming components. |
| USB-C Port Overvoltage Protection | Smart Lighting LED Driver Feedback |
|
Use Scenario: Protecting USB-C controller ICs from accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Shunt regulator absorbing excess current when input exceeds 18.35 V. Use Value: Activates within 100 ns of overvoltage event, limiting sustained overvoltage to <18.5 V at 100 mA surge. |
Use Scenario: Setting feedback threshold in constant-current LED drivers for automotive interior lighting. IC Role / Device Role / Timing Role: Voltage reference in op-amp feedback loop controlling MOSFET gate drive. Use Value: Maintains ±0.2 % current regulation across temperature due to low rdif and predictable tempco. |
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 | 18 V nominal, ±5 % tolerance, 100 Ω rdif, SOT-23 package | Higher voltage tolerance and impedance reduce regulation accuracy in precision references | Select when cost sensitivity outweighs tight voltage control needs |
| MMSZ5245B-TP | 18 V nominal, ±5 % tolerance, 30 Ω rdif, SOD-123 package | Lower impedance improves load regulation but lacks AEC-Q101 qualification | Select for industrial non-automotive applications requiring tighter dynamic response |
Compared with BZX84-C18LT1G and MMSZ5245B-TP, PDZ18B-QF offers superior voltage accuracy (±2 % vs. ±5 %), automotive qualification, and optimized thermal performance in SOD323-making it preferred for safety-critical 18 V reference and clamping functions where consistency and reliability are mandatory.
Availability
PDZ18B-QF is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor conditioning, and USB-C protection circuits requiring stable component supply with guaranteed long-term availability.
Supply support for PDZ18B-QF 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, with leadership in automotive-qualified components.
The PDZ-B-Q series targets automotive and industrial voltage regulation needs, delivering AEC-Q101-compliant Zener diodes with tight tolerances, low leakage, and robust thermal performance in miniature SMD packages.
FAQ
What is the maximum reverse current specification for PDZ18B-QF at 13 V?
The maximum reverse current (IR) is 0.05 µA at VR = 13 V and Tj = 25 °C, measured per datasheet Table 8. This ultra-low leakage supports energy-efficient operation in always-on automotive modules and extends battery life in portable sensor nodes.
Does PDZ18B-QF support reflow soldering, and what footprint is recommended?
Yes, PDZ18B-QF is qualified for lead-free reflow soldering. Nexperia specifies a 0.5 mm × 1.65 mm solder land pattern with 0.6 mm solder resist opening per lead (Figure 9), optimized for IPC-7351B compliance and high-yield assembly on FR4 PCBs.
How does the +14.4 mV/K temperature coefficient affect circuit design?
This positive coefficient means VZ increases by 14.4 mV per Kelvin rise in junction temperature. Designers use it to counteract negative tempcos in associated circuitry-e.g., pairing with NTC thermistors or op-amp compensation networks to achieve net-zero drift in precision references.
Is PDZ18B-QF pin-compatible with other SOD323 Zener diodes from Nexperia?
Yes-PDZ18B-QF shares identical SOD323 mechanical dimensions, pinout (cathode/anode), and solder footprint with all PDZ-B-Q series variants (e.g., PDZ12B-Q, PDZ24B-Q). This enables drop-in voltage scaling across designs without layout revision.
PDZ18B-QF 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-QF FAQ
1.How can I place an order for PDZ18B-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ18B-QF 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-QF reliable?
The price and inventory of PDZ18B-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ18B-QF is usually 5 days.
3.What payment methods are accepted for PDZ18B-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ18B-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ18B-QF?
PDZ18B-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ18B-QF 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-QF?
For technical support, including PDZ18B-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ18B-QF requirements.
6.How does Aetrix verify that PDZ18B-QF is sourced from the original manufacturer or authorized distributors?
All PDZ18B-QF 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-QF meets industry standards.
7.What is the process for return or replacement of PDZ18B-QF?
All PDZ18B-QF units undergo pre-shipment inspection (PSI). If there is an issue with PDZ18B-QF, 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-QF part is unused and in its original packaging.
Return procedure for PDZ18B-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ18B-QF Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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