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Nexperia USA Inc. PZU84-C18R
- Part No.:
- PZU84-C18R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PZU84-C18R.pdf
- Description:
- DIODE ZENER 18V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,517
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Product details
Overview
PZU84-C18R from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, providing precise 18 V regulation at 5 mA with 80 Ω differential resistance and −2.0 mV/K temperature coefficient, used for voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the PZU84-C18R datasheet, PZU84-C18R pinout, PZU84-C18R application, or PZU84-C18R equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at nominal test current, thermal resistance to ambient, leakage behavior under low bias, and SOT23 mounting compatibility with standard FR4 PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode with hard knee characteristics optimized for stable reference generation. It delivers 18 V nominal regulation at IZ = 5 mA, with differential resistance of 80 Ω (typ) ensuring minimal output voltage shift under load variation.
Its temperature coefficient of −2.0 mV/K (typ) at 18 V enables predictable drift compensation in precision analog circuits, while its 0.05 μA max reverse leakage at VR = 13 V supports low-power standby regulation without significant quiescent loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 16.94 V to 19.03 V at IZ = 5 mA - defines regulation band for feedback sensing accuracy |
| Differential Resistance rdif | 80 Ω (max) at IZ = 5 mA - determines output impedance and load regulation error |
| Temperature Coefficient SZ | −2.0 mV/K (typ) - quantifies voltage drift per degree Celsius in thermal management design |
| Reverse Leakage IR | 0.05 μA max at VR = 13 V - ensures negligible standby current in always-on reference paths |
| Total Power Dissipation Ptot | 250 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous DC power handling capability |
| Junction-to-Ambient Rth(j-a) | 500 K/W - defines thermal rise per watt in natural convection environments |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - constrains forward-biased conduction loss in clamp configurations |
Pinout & Package
SOT23 plastic surface-mounted package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, 3-terminal configuration with cathode tab solder point.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node in reverse-bias regulation; carries forward current during transient clamping |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or thermal pad connection permitted |
| 3 | Cathode (K) | Primary connection for regulated output node; serves as thermal path to PCB via solder point |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tight regulation without post-production trimming in cost-sensitive industrial power supplies |
| Hard breakdown knee | Ensures rapid transition into regulation zone, minimizing ambiguity in threshold detection circuits |
| Low 80 Ω dynamic impedance | Reduces output voltage deviation under varying load currents in feedback networks |
| 0.05 μA max leakage at 13 V | Preserves battery life in low-power IoT sensor nodes using Zener-based wake-up references |
| SOT23 footprint compatibility | Supports automated placement and reflow on standard 70 μm copper FR4 boards without redesign |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters by sensing secondary-side voltage via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener diode provides stable 18 V reference for TL431-like comparator input, defining regulation setpoint. Use Value: Tight ±2 % tolerance and low 80 Ω impedance maintain ±1.5 % output regulation across line/load/temperature variations. |
Use Scenario: Protecting microcontroller I/O pins from ESD-induced transients exceeding absolute maximum ratings. IC Role / Device Role / Timing Role: Acts as shunt clamp between signal line and ground, conducting only when voltage exceeds 18 V breakdown threshold. Use Value: Sub-μA leakage preserves signal integrity in high-impedance sensor interfaces while clamping 40 W non-repetitive surges. |
| Reference Voltage Generator | Battery Monitoring Threshold |
|
Use Scenario: Generating a stable 18 V reference for ADC input scaling in industrial data acquisition modules. IC Role / Device Role / Timing Role: Provides low-drift, low-noise voltage source for precision analog front-end calibration. Use Value: −2.0 mV/K temperature coefficient allows predictable drift compensation in firmware, reducing need for multi-point calibration. |
Use Scenario: Detecting end-of-charge condition in 16.8 V Li-ion battery packs by comparing cell voltage against fixed 18 V threshold. IC Role / Device Role / Timing Role: Functions as comparator input reference in discrete voltage detector circuit with hysteresis. Use Value: Hard knee and low leakage ensure clean switching edge and minimal false triggers during battery voltage ripple. |
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 | ±5 % tolerance, 100 Ω rdif (max), −2.0 mV/K SZ, same SOT23 package | Higher voltage uncertainty and impedance reduce regulation accuracy in precision feedback paths | Select when cost sensitivity outweighs regulation stability requirements |
| MMSZ4689 | ±5 % tolerance, 100 Ω rdif (max), −2.0 mV/K SZ, SOD-123 package (larger footprint) | Larger thermal resistance (625 K/W) limits power handling in compact layouts | Choose only if legacy SOD-123 board space is fixed and 250 mW derating is acceptable |
Compared with BZX84-C18 and MMSZ4689, PZU84-C18R offers tighter ±2 % tolerance and lower 80 Ω dynamic impedance-critical for maintaining <±1.5 % output regulation in SMPS feedback and enabling reliable 18 V threshold detection in battery monitors where leakage and knee sharpness directly impact decision accuracy.
Availability
PZU84-C18R is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage protection clamps, and precision reference voltage generation requiring stable component supply across automotive infotainment power rails, industrial PLC analog inputs, and medical device battery monitoring circuits.
Supply support for PZU84-C18R 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 devices with focus on reliability, efficiency, and miniaturization for high-volume electronics.
The PZU84 series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered for stable voltage reference and protection in space-constrained consumer, industrial, and computing power systems using SOT23 packaging.
FAQ
What is the guaranteed Zener voltage range for PZU84-C18R at 5 mA test current?
The guaranteed Zener voltage range is 16.94 V to 19.03 V at IZ = 5 mA and Tj = 25 °C, reflecting its ±2 % tolerance specification. This range remains valid across the full operating junction temperature range of −55 °C to +150 °C, with voltage drift governed by the −2.0 mV/K temperature coefficient.
Can PZU84-C18R be used in forward-bias applications such as LED driving or level shifting?
No-PZU84-C18R is designed exclusively for reverse-bias Zener operation. Its forward voltage is specified only up to 0.9 V at 10 mA and lacks rated forward current capability beyond brief pulse testing. Using it in sustained forward conduction risks thermal runaway and permanent degradation due to absence of forward safe operating area (SOA) characterization.
How does the "n.c." pin (Pin 2) affect PCB layout and thermal design?
Pin 2 is internally not connected and must remain electrically isolated-no trace, pour, or thermal pad should contact it. Including copper under Pin 2 increases parasitic capacitance and may compromise high-frequency noise rejection. Thermal performance relies solely on Pins 1 (anode) and 3 (cathode), with the cathode tab serving as the primary heat path to the PCB.
Is PZU84-C18R suitable for automotive applications per AEC-Q200?
No-PZU84-C18R is not AEC-Q200 qualified. The datasheet explicitly states it is a non-automotive qualified product, lacking stress testing for temperature cycling, humidity, and vibration required for automotive use. For automotive-grade 18 V Zener regulation, Nexperia's Automotive Qualified PZUx series (e.g., PZU18B2) must be selected instead.
PZU84-C18R 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:
- ±5%
- 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-C18R FAQ
1.How can I place an order for PZU84-C18R through Aetrix?
Please submit a Request for Quotation (RFQ) for PZU84-C18R 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-C18R reliable?
The price and inventory of PZU84-C18R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-C18R is usually 5 days.
3.What payment methods are accepted for PZU84-C18R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-C18R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PZU84-C18R?
PZU84-C18R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PZU84-C18R 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-C18R?
For technical support, including PZU84-C18R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-C18R requirements.
6.How does Aetrix verify that PZU84-C18R is sourced from the original manufacturer or authorized distributors?
All PZU84-C18R 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-C18R meets industry standards.
7.What is the process for return or replacement of PZU84-C18R?
All PZU84-C18R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-C18R, 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-C18R part is unused and in its original packaging.
Return procedure for PZU84-C18R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PZU84-C18R Tags
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