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Nexperia USA Inc. PDZ18BZ
- Part No.:
- PDZ18BZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PDZ18BZ.pdf
- Description:
- DIODE ZENER 18V 400MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:23,962
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Product details
Overview
PDZ18BZ from Nexperia is a single silicon Zener diode designed for low-power voltage regulation in compact SMD applications, featuring a nominal Zener voltage of 17.56–18.35 V at IZ = 5 mA, ±2 % tolerance, 80 Ω maximum differential resistance, 0.05 μA maximum reverse leakage at VR = 13 V, and 1.5 mV/K temperature coefficient - deployed in power supply reference, overvoltage clamping, and bias stabilization circuits.
For engineers reviewing the PDZ18BZ datasheet, PDZ18BZ pinout, PDZ18BZ application, or PDZ18BZ equivalent, this device is selected for precision low-current regulation where thermal stability, small footprint (SOD323), and hard breakdown knee are critical - especially in battery-powered sensors, analog front-ends, and voltage monitor IC reference paths.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified working voltage range defined at IZ = 5 mA, exhibiting a typical temperature coefficient of +14.4 mV/K and low dynamic impedance (≤80 Ω) to maintain stable regulation under varying load conditions. Its junction-to-solder-point thermal resistance is 130 K/W, enabling reliable operation up to +150 °C junction temperature.
The device uses a planar epitaxial process for consistent breakdown characteristics and features a hard knee in the IZ-VZ curve - confirmed by low leakage (<0.05 μA at 13 V) and tight voltage distribution across production lots - making it suitable for applications requiring predictable turn-on behavior without soft saturation.
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 reference circuits |
| Differential Resistance rdif | ≤80 Ω - ensures minimal output voltage shift under load current variation |
| Reverse Leakage IR | ≤0.05 μA at VR = 13 V - enables ultra-low standby power in always-on monitoring nodes |
| Temperature Coefficient SZ | +14.4 mV/K - provides predictable, positive drift for compensation-aware designs |
| Total Power Dissipation Ptot | 400 mW at Tamb ≤ 25 °C - supports continuous operation on standard FR4 PCBs |
| Forward Voltage VF | 0.9 V at IF = 10 mA - allows use as polarity-sensitive clamp or protection element |
| Junction-to-Ambient Rth(j-a) | 340 K/W - informs thermal design margin for ambient temperatures up to +85 °C |
Pinout & Package
PDZ18BZ is housed in a SOD323 (SC-76) surface-mount plastic package measuring 1.8 × 1.35 × 0.95 mm, with cathode indicated by a marking bar on the device body. The package is optimized for reflow and wave soldering per IPC-7095 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes bias path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Hard breakdown knee | Sharp, well-defined Zener transition enables accurate threshold detection without hysteresis |
| Low dynamic impedance | ≤80 Ω at 5 mA ensures <10 mV output deviation across ±1 mA load change |
| Ultra-low leakage current | ≤0.05 μA at 13 V minimizes quiescent current in high-impedance reference dividers |
| ±2 % voltage tolerance | Tight initial calibration reduces need for post-production trimming in precision references |
| SOD323 footprint compatibility | Standardized 0.95 mm height and 0.6 mm pad spacing supports automated placement and AOI inspection |
Applications
| Power Supply Reference | Analog Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 18 V reference for LDO feedback networks or ADC voltage references in industrial controllers. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed DC reference voltage independent of input ripple. Use Value: Enables ±0.36 V regulation accuracy (±2 %) and <0.8 mV/mA line regulation due to low rdif, improving system measurement repeatability. |
Use Scenario: Biasing op-amp input stages or setting common-mode voltage in low-power gas/temperature sensor signal chains. IC Role / Device Role / Timing Role: Passive voltage source establishing known DC offset for differential amplifiers and instrumentation circuits. Use Value: Ultra-low leakage (<0.05 μA) prevents loading of high-impedance sensor outputs, preserving signal integrity in sub-μA sensor nodes. |
| Overvoltage Clamp | Microcontroller Reset Circuit |
|
Use Scenario: Protecting 18 V-rated interface pins (e.g., CAN transceiver VCC) from transient surges exceeding 20 V. IC Role / Device Role / Timing Role: Shunt element conducting excess energy to ground when input exceeds Zener breakdown threshold. Use Value: Hard knee and 1.5 A non-repetitive peak surge rating (at 100 μs) provide fast, predictable clamping without oscillation or snapback delay. |
Use Scenario: Generating clean reset pulse for 3.3 V microcontrollers using resistor-divider + Zener-based brown-out detection. IC Role / Device Role / Timing Role: Stable voltage reference feeding comparator input to trigger reset when main supply drops below safe level. Use Value: +14.4 mV/K temperature coefficient allows intentional compensation against MCU VDD drift, extending valid reset window across –40 to +125 °C. |
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 nominal, but ±5 % tolerance and higher rdif (100 Ω); SOT-23 package (larger footprint) | Less precise regulation; requires larger PCB area; higher thermal resistance (450 K/W) | Select when cost sensitivity outweighs regulation accuracy and board space constraints |
| MMSZ5245B | 18 V nominal, ±5 % tolerance, 100 Ω rdif, 0.1 μA leakage at 14 V; SOD-123 package | Higher leakage degrades high-Z reference performance; larger thermal resistance limits power handling | Prefer only if legacy SOD-123 footprint compatibility is mandatory and tighter specs are not required |
Compared with BZX84-C18 and MMSZ5245B, PDZ18BZ delivers superior voltage accuracy (±2 % vs ±5 %), lower dynamic impedance (80 Ω vs ≥100 Ω), and significantly reduced leakage - directly translating to improved reference stability and lower system-level calibration burden in precision analog designs.
Availability
PDZ18BZ is available at Aetrix Electronics and suitable for industrial sensor modules, portable medical monitors, and automotive body-control units requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for PDZ18BZ 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 and advanced packaging technologies.
PDZ18BZ belongs to the PDZ-B series of low-power Zener diodes engineered specifically for space-constrained, low-leakage voltage regulation in consumer, industrial, and communication equipment - emphasizing manufacturability, consistency, and thermal robustness.
FAQ
What is the maximum continuous reverse current (IZ) that PDZ18BZ can sustain without degradation?
PDZ18BZ is rated for continuous Zener current up to 200 mA, as derived from its 400 mW total power dissipation limit and minimum Zener voltage of 17.56 V (400 mW ÷ 17.56 V ≈ 22.8 mA). However, sustained operation above 5–10 mA requires thermal derating per Figure 1; the absolute maximum continuous reverse current is 200 mA only at Tamb ≤ 25 °C with ideal heatsinking.
Does PDZ18BZ support reflow soldering, and what profile is recommended?
Yes, PDZ18BZ is qualified for lead-free reflow soldering per J-STD-020. The recommended profile uses peak temperature of 260 °C for ≤30 seconds, with ramp-up rate ≤3 °C/s and ramp-down rate ≤6 °C/s. Figure 9 specifies solder land dimensions (0.6 mm × 0.5 mm, 1.65 mm pitch), and the device's SOD323 package withstands up to 260 °C for 10 seconds without parametric shift.
How does the +14.4 mV/K temperature coefficient affect circuit performance across –40 °C to +125 °C?
Over this range, VZ shifts by approximately +2.4 V (14.4 mV/K × 165 K), moving from ~16.4 V at –40 °C to ~18.8 V at +125 °C. This predictable positive drift enables intentional compensation - e.g., pairing with a negative-coefficient resistor network in voltage references to achieve net zero TC across the full industrial temperature range.
Can PDZ18BZ be used in bidirectional ESD protection configurations?
No - PDZ18BZ is a unidirectional Zener diode optimized for reverse-bias regulation, not symmetric transient suppression. Its forward voltage is 0.9 V at 10 mA, but it lacks specified ESD ratings (e.g., IEC 61000-4-2), bidirectional clamping symmetry, or guaranteed snapback behavior. For ESD protection, dedicated TVS diodes like PESD5V0S1BA should be used instead.
PDZ18BZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- PDZ-B
- 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):
- 80 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
PDZ18BZ FAQ
1.How can I place an order for PDZ18BZ through Aetrix?
Please submit a Request for Quotation (RFQ) for PDZ18BZ 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 PDZ18BZ reliable?
The price and inventory of PDZ18BZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PDZ18BZ is usually 5 days.
3.What payment methods are accepted for PDZ18BZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PDZ18BZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PDZ18BZ?
PDZ18BZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PDZ18BZ 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 PDZ18BZ?
For technical support, including PDZ18BZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PDZ18BZ requirements.
6.How does Aetrix verify that PDZ18BZ is sourced from the original manufacturer or authorized distributors?
All PDZ18BZ 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 PDZ18BZ meets industry standards.
7.What is the process for return or replacement of PDZ18BZ?
All PDZ18BZ units undergo pre-shipment inspection (PSI). If there is an issue with PDZ18BZ, 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 PDZ18BZ part is unused and in its original packaging.
Return procedure for PDZ18BZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PDZ18BZ Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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