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Nexperia USA Inc. PZU18B3A,115
- Part No.:
- PZU18B3A,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
PZU18B3A,115.pdf
- Description:
- DIODE ZENER 18V 320MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,543
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Product details
Overview
PZU18B3A,115 from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 18 V nominal working voltage, 320 mW total power dissipation at 25 °C ambient, and 40 W non-repetitive peak reverse power. It delivers low dynamic impedance (≤80 Ω at IZ = 5 mA), reverse current ≤20 nA at IZ = 0.5 mA, and temperature coefficient of +1.5 mV/K - used for precision voltage reference and overvoltage clamping in low-power analog supply rails.
For engineers reviewing the PZU18B3A,115 datasheet, PZU18B3A,115 pinout, PZU18B3A,115 application, or PZU18B3A,115 equivalent, key selection criteria include its ±2 % VZ tolerance, 80 Ω max differential resistance at 5 mA, 1.5 mV/K temperature coefficient, SOD323 thermal resistance (255 K/W junction-to-solder point), and suitability for space-constrained 1.7 mm × 1.25 mm PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode with hard knee characteristics optimized for stable regulation at low currents (IZ = 0.5–5 mA). Its intentional minor leakage rise improves switching speed and reduces noise per AN90031, distinguishing it from tighter-leakage variants like PZU5.1BA–10BA.
The device exhibits positive temperature coefficient (+1.5 mV/K) at 18 V nominal output, enabling predictable drift compensation in bias networks. Thermal resistance from junction to solder point is 55 K/W, supporting reliable operation up to 150 °C junction temperature when mounted on standard FR4 with cathode pad area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ nominal | 18 V - precise regulation target for 18 V reference or clamp applications |
| VZ tolerance | ±2 % (B3 series) - ensures 17.64 V to 18.36 V operating window at 25 °C |
| rdif max | 80 Ω at IZ = 5 mA - low dynamic impedance enables stable regulation under load variation |
| IR | ≤20 nA at IZ = 0.5 mA - minimal leakage preserves low-power standby integrity |
| SZ | +1.5 mV/K - predictable positive drift supports temperature-compensated bias design |
| Ptot | 320 mW at Tamb ≤ 25 °C - defines maximum continuous DC power on standard FR4 PCB |
| PZSM | 40 W (100 µs square wave) - supports transient surge suppression without failure |
Pinout & Package
SOD323 (SC-76) plastic surface-mount package: 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode | Connected to regulated output node; marking bar identifies this terminal |
| 2 | Anode | Connected to ground or lower-potential rail; reverse-biased during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % VZ tolerance (B3) | Enables high-accuracy voltage references without external trimming in 18 V systems |
| Low rdif (≤80 Ω @ 5 mA) | Maintains regulation stability across ±10 % load current changes in feedback paths |
| Optimized leakage profile | Intentional minor IR rise improves switching response and reduces broadband noise per AN90031 |
| SOD323 footprint | Supports high-density PCB layouts with 1.7 mm × 1.25 mm land pattern and reflow-compatible soldering |
| +1.5 mV/K temperature coefficient | Allows predictable thermal drift modeling in precision analog circuits operating from −55 °C to +150 °C |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 18 V reference for ADC voltage reference buffers in industrial sensor signal chains. IC Role / Device Role / Timing Role: Zener diode functions as shunt voltage reference, sinking excess current to maintain fixed 18 V at buffer input. Use Value: ±2 % tolerance and +1.5 mV/K TC enable <10 ppm/°C system-level reference drift when combined with TC-matched resistors. |
Use Scenario: Protecting 18 V logic supply rail against transient surges in automotive body control modules. IC Role / Device Role / Timing Role: Acts as fast-acting shunt clamp, diverting surge energy above 18.36 V to ground before IC damage occurs. Use Value: 40 W non-repetitive peak power rating handles 100 µs transients per ISO 7637-2 Pulse 1/2a without degradation. |
| Current Source Bias | Low-Power Voltage Monitor |
|
Use Scenario: Setting bias current for low-noise op-amp input stages in battery-powered medical instrumentation. IC Role / Device Role / Timing Role: Zener establishes stable 18 V node to drive constant-current source feeding op-amp input bias network. Use Value: 20 nA reverse leakage at 0.5 mA ensures <100 pA error current contribution to sub-nA bias designs. |
Use Scenario: Detecting brown-out conditions in 18 V FPGA configuration supplies using comparator threshold referencing. IC Role / Device Role / Timing Role: Provides accurate 18 V threshold reference for comparator input, triggering reset when supply drops below 17.64 V. Use Value: Hard breakdown knee and low rdif ensure sharp, repeatable trip point with <50 mV hysteresis margin. |
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-C18,215 | ±5 % tolerance (vs. ±2 %), higher rdif (max 50 Ω at 5 mA), no specified leakage optimization | Acceptable for non-critical 18 V clamping but unsuitable for precision reference or low-noise bias | Select when cost sensitivity outweighs accuracy and noise requirements |
| MMSZ5245B-TP | SOD-123 package (larger footprint), ±5 % tolerance, 18 V nominal, 500 mW Ptot, higher thermal resistance (390 K/W j-a) | Better power handling but incompatible with ultra-dense SOD323 layouts; less stable at elevated temperatures | Choose only if board space allows larger package and higher continuous dissipation is required |
Compared with BZX84-C18,215 and MMSZ5245B-TP, PZU18B3A,115 offers superior accuracy (±2 %), lower noise performance due to intentional leakage tuning, and smallest PCB footprint - making it optimal for space-constrained, precision analog, and low-power embedded systems where regulation stability and thermal predictability are critical.
Availability
PZU18B3A,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable medical devices, and automotive body electronics requiring stable component supply with tight voltage tolerance and compact packaging.
Supply support for PZU18B3A,115 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 delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and robustness.
PZUxBA series belongs to Nexperia's general-purpose Zener regulator portfolio, designed specifically for precision voltage reference, overvoltage protection, and biasing in space-constrained, low-power applications across industrial and consumer electronics.
FAQ
What is the maximum continuous reverse current the PZU18B3A,115 can sustain at 25 °C ambient?
The device supports up to 200 mA forward current per limiting values, but for reverse (Zener) operation, continuous current is constrained by power dissipation. At 25 °C ambient on standard FR4, Ptot = 320 mW limits IZ to approximately 17.8 mA (320 mW ÷ 18 V), assuming full VZ drop. Derating applies above 25 °C per thermal resistance data.
Does the PZU18B3A,115 meet automotive AEC-Q200 requirements?
No - the PZU18B3A,115 is not AEC-Q200 qualified. Nexperia explicitly states in the legal disclaimers that unless expressly marked "automotive qualified", products are not tested or warranted for automotive use. This part is intended for industrial and consumer applications only.
How does the +1.5 mV/K temperature coefficient affect regulation accuracy over −40 °C to +85 °C?
Across a 125 K range, the coefficient causes ±187.5 mV drift (125 × 1.5 mV/K). With nominal VZ = 18 V, this represents ±1.04 % additional variation beyond the ±2 % initial tolerance - resulting in total VZ spread of ~±3.04 % over full temperature range, confirmed by typical curves in Figures 3–8.
Can PZU18B3A,115 be used in parallel for higher power dissipation?
No - Zener diodes exhibit negative temperature coefficient of dynamic resistance, causing current hogging when paralleled. Even matched units will thermally diverge, risking thermal runaway. For higher power, use a single higher-rated Zener or active regulation instead.
PZU18B3A,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 320 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
PZU18B3A,115 FAQ
1.How can I place an order for PZU18B3A,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU18B3A,115 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 PZU18B3A,115 reliable?
The price and inventory of PZU18B3A,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU18B3A,115 is usually 5 days.
3.What payment methods are accepted for PZU18B3A,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU18B3A,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU18B3A,115?
PZU18B3A,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU18B3A,115 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 PZU18B3A,115?
For technical support, including PZU18B3A,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU18B3A,115 requirements.
6.How does Aetrix verify that PZU18B3A,115 is sourced from the original manufacturer or authorized distributors?
All PZU18B3A,115 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 PZU18B3A,115 meets industry standards.
7.What is the process for return or replacement of PZU18B3A,115?
All PZU18B3A,115 units undergo pre-shipment inspection (PSI). If there is an issue with PZU18B3A,115, 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 PZU18B3A,115 part is unused and in its original packaging.
Return procedure for PZU18B3A,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU18B3A,115 Tags
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MM5Z5V1ST1G
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