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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Nexperia USA Inc. PZU84-B18R

Name: PZU84-B18R
Brand: Nexperia USA Inc.
SKU: PZU84-B18R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZU84-B18R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: PZU84-B18R.pdf

Description:: DIODE ZENER 18V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Inventory:6,186

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Product details

Overview

PZU84-B18R from Nexperia is a ±2 % tolerance Zener voltage regulator diode with nominal 18 V breakdown voltage, optimized for low-leakage, hard-knee regulation in SOT23 package; features 13 Ω typical differential resistance at I_Z = 5 mA, −2.0 mV/K temperature coefficient, and 93 pF capacitance at 1 MHz, used in precision reference and overvoltage clamp circuits.

For engineers reviewing the PZU84-B18R datasheet, PZU84-B18R pinout, PZU84-B18R application, or PZU84-B18R equivalent, this page delivers verified Zener parameters, SOT23 terminal mapping, real-world regulation use cases, and validated alternative parts with documented electrical and thermal trade-offs.

Technical Context

This Zener operates as a two-terminal shunt voltage reference, maintaining stable 18 V regulation across 0.5–20 mA reverse current range with sharp breakdown knee and minimal leakage (≤0.05 μA at VR = 14.4 V). Its negative temperature coefficient (−2.0 mV/K) enables predictable drift compensation in temperature-sensitive analog circuits.

The device uses silicon planar epitaxial construction for repeatable V_Z tolerance and low dynamic impedance (13 Ω typ. at 5 mA), while its SOT23 footprint supports high-density PCB layouts with R_th(j-a) = 500 K/W in free air and R_th(j-sp) = 330 K/W to cathode solder point.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	18 V nominal, ±2 % tolerance (17.64–18.36 V); ensures tight regulation in feedback loops and reference rails.
Differential Resistance r_dif	13 Ω typical at I_Z = 5 mA; minimizes output voltage variation under load transients.
Temperature Coefficient S_Z	−2.0 mV/K at I_Z = 5 mA; enables predictable thermal drift modeling for compensated designs.
Reverse Current I_R	≤0.05 μA at V_R = 14.4 V; reduces standby power loss in battery-powered clamping circuits.
Capacitance C_d	93 pF at f = 1 MHz, V_R = 0 V; limits high-frequency noise coupling in signal-path references.
Power Dissipation P_tot	250 mW at T_amb = 25 °C on FR4 PCB; defines maximum continuous DC power handling.
Non-repetitive Peak Power	40 W at t_p = 100 μs; supports transient surge suppression without failure.

Pinout & Package

SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3).

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node in shunt regulation; reverse-biased during normal operation.
2	Not Connected (n.c.)	Internally unconnected; must remain floating-no PCB trace or via allowed.
3	Cathode (K)	Connected to regulated voltage rail; carries full Zener current and defines thermal path to solder point.

Key Features

Feature	Design Value
±2 % V_Z tolerance	Enables single-supply reference accuracy without post-assembly trimming in industrial sensor interfaces.
Hard breakdown knee	Ensures rapid transition from non-conduction to regulation, improving response to overvoltage events.
Very low leakage current	Reduces quiescent current in always-on protection circuits, extending battery life in portable devices.
Optimized for low-current regulation	Stable performance down to 0.5 mA allows use in ultra-low-power microcontroller reset circuits.

Applications

Microcontroller Reset Circuit

ADC Reference Clamp

Use Scenario: Provides precise 18 V threshold for supervisory IC reset assertion during brown-out conditions.

IC Role / Device Role / Timing Role: Shunt voltage reference defining reset trigger level; no timing function.

Use Value: Tight ±2 % V_Z eliminates need for external resistor divider, reducing BOM count and layout area.

Use Scenario: Clamps ADC input voltage to prevent damage from transient overvoltage beyond supply rail.

IC Role / Device Role / Timing Role: Passive overvoltage protector; responds within nanoseconds to fast transients.

Use Value: 93 pF capacitance minimizes signal distortion at 1 MHz sampling rates while limiting peak current to safe levels.

Industrial Sensor Signal Conditioning

DC-DC Converter Feedback Reference

Use Scenario: Stabilizes excitation voltage for bridge-based pressure sensors operating in 0–85 °C ambient.

IC Role / Device Role / Timing Role: Precision voltage reference source; temperature coefficient enables drift compensation.

Use Value: −2.0 mV/K coefficient allows matching with sensor offset drift, improving system-level accuracy.

Use Scenario: Sets output voltage of isolated flyback converter via optocoupler feedback network.

IC Role / Device Role / Timing Role: Primary-side shunt reference establishing regulation setpoint; no switching role.

Use Value: 13 Ω r_dif maintains <10 mV output deviation across 10–90 % load steps, meeting industrial PSU specs.

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	±5 % tolerance, 20 Ω r_dif at 5 mA, −2.5 mV/K coefficient, 100 pF capacitance	Higher V_Z drift and looser tolerance reduce accuracy in precision references but acceptable for general-purpose clamping	Select when cost sensitivity outweighs regulation accuracy and thermal stability requirements
MMSZ5245B	±5 % tolerance, 23 Ω r_dif, −2.0 mV/K, 30 pF capacitance, 500 mW P_tot	Lower capacitance improves HF performance but higher power rating increases thermal mass and board space	Prefer for high-frequency signal clamping where low C_d is critical, accepting larger SOD-123 footprint

Compared with PZU84-B18R, BZX84-C18 trades regulation accuracy for cost, while MMSZ5245B sacrifices compactness for reduced capacitive loading-making PZU84-B18R optimal for space-constrained, precision 18 V reference designs requiring low leakage and sharp knee behavior.

Availability

PZU84-B18R is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller reset circuits, and DC-DC converter feedback networks requiring stable component supply with guaranteed long-term continuity.

Supply support for PZU84-B18R 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 logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.

The PZU84 series belongs to Nexperia's general-purpose Zener regulator product line, engineered for high-volume industrial and consumer applications demanding tight tolerance, low leakage, and robust SMT manufacturability in SOT23.

FAQ

What is the maximum reverse current before breakdown for PZU84-B18R?

The PZU84-B18R exhibits ≤0.05 μA reverse leakage at VR = 14.4 V (80 % of nominal VZ), rising to 1 μA at VR = 16.2 V (90 % of VZ), per Table 8 characteristics. Breakdown is defined at IZ = 5 mA, where VZ reaches 17.64–18.36 V with 13 Ω differential resistance.

Can PZU84-B18R be used in place of a 1N4746A?

No-PZU84-B18R is a ±2 %, 18 V Zener in SOT23 with 250 mW dissipation, while 1N4746A is a ±5 %, 18 V through-hole device rated for 1 W. The PZU84-B18R cannot handle equivalent power; substitution requires thermal redesign and footprint adaptation, and is only viable in low-power (<250 mW) applications.

How does the n.c. pin affect PCB layout?

Pin 2 is internally unconnected and must remain electrically isolated-no copper trace, pad, or via may contact it. Standard SOT23 reflow footprints (Fig. 10) allocate 0.6 mm solder land width for Pin 2; violating isolation risks shorting adjacent traces or compromising mechanical stability during thermal cycling.

Is PZU84-B18R automotive qualified?

No-PZU84-B18R is not AEC-Q200 qualified. It is specified for industrial and consumer use across −55 °C to +150 °C ambient, but lacks automotive-grade screening, qualification testing, and PPAP documentation. For automotive applications, Nexperia's Automotive Qualified Zener series (e.g., PZUxx-Ax) must be selected instead.

PZU84-B18R Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: PZU84

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 18 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 20 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 13 V

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 10 mA

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

PZU84-B18R FAQ

1.How can I place an order for PZU84-B18R through Aetrix?

Please submit a Request for Quotation (RFQ) for PZU84-B18R 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 PZU84-B18R reliable?

The price and inventory of PZU84-B18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-B18R is usually 5 days.

3.What payment methods are accepted for PZU84-B18R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B18R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZU84-B18R?

PZU84-B18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZU84-B18R 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 PZU84-B18R?

For technical support, including PZU84-B18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B18R requirements.

6.How does Aetrix verify that PZU84-B18R is sourced from the original manufacturer or authorized distributors?

All PZU84-B18R 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 PZU84-B18R meets industry standards.

7.What is the process for return or replacement of PZU84-B18R?

All PZU84-B18R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B18R, 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 PZU84-B18R part is unused and in its original packaging.

Return procedure for PZU84-B18R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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