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

Nexperia USA Inc. PZU84-C4V3R

Name: PZU84-C4V3R
Brand: Nexperia USA Inc.
SKU: PZU84-C4V3R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZU84-C4V3R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: PZU84-C4V3R.pdf

Description:: DIODE ZENER 4.3V 250MW TO236AB

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Product details

Overview

PZU84-C4V3R from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT23 package, rated for 4.3 V nominal breakdown voltage at I_Z = 5 mA, with differential resistance ≤90 Ω, low leakage (≤3 μA at V_R = 1 V), and 250 mW total power dissipation - used for precision voltage reference and overvoltage clamping in low-power analog circuits.

For engineers reviewing the PZU84-C4V3R datasheet, PZU84-C4V3R pinout, PZU84-C4V3R application, or PZU84-C4V3R equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at low bias current, thermal resistance (R_th(j-a) = 500 K/W), reverse leakage behavior, and SOT23 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable 4.3 V output across load variations by conducting reverse current above its specified Zener knee. Its hard breakdown knee and low rdif ensure minimal voltage drift under dynamic load transients.

Designed for low-current regulation (IZ = 0.5–5 mA), it features temperature coefficient of −3.5 mV/K at 25 °C and junction-to-ambient thermal resistance of 500 K/W on FR4 PCB - enabling reliable operation up to 150 °C junction temperature without forced cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	4.01 V to 4.48 V at I_Z = 5 mA - ensures tight 4.3 V regulation with ±2 % tolerance for reference stability
Differential Resistance r_dif	≤90 Ω at I_Z = 5 mA - minimizes output voltage variation under load current changes
Reverse Leakage I_R	≤3 μA at V_R = 1 V - reduces standby power loss in battery-powered systems
Total Power Dissipation P_tot	250 mW on FR4 PCB - supports continuous operation in compact consumer and industrial modules
Junction Temperature T_j	−55 °C to +150 °C - enables deployment in extended-temperature industrial environments
Thermal Resistance R_th(j-a)	500 K/W - defines self-heating rise per watt; requires thermal-aware layout for sustained 250 mW use
Forward Voltage V_F	≤0.9 V at I_F = 10 mA - allows use as low-drop rectifier or ESD clamp in bidirectional protection schemes

Pinout & Package

SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch) with gull-wing leads and standard reflow footprint per Figure 10.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connects to lower-potential node; reverse-biased during Zener operation
2	Not Connected (n.c.)	Internally unconnected; must remain floating - no PCB trace or solder mask relief required
3	Cathode (K)	Connects to higher-potential node; carries reverse current during regulation

Key Features

Feature	Design Value
±2 % Zener voltage tolerance	Enables direct replacement in precision 4.3 V reference designs without recalibration
Hard breakdown knee	Ensures predictable turn-on at 4.3 V with minimal hysteresis or snapback instability
Low dynamic impedance (≤90 Ω)	Maintains <±10 mV output shift across 1–5 mA load current range
Very low leakage (≤3 μA @ 1 V)	Reduces quiescent current in always-on sensor bias networks and RTC backup circuits
SOT23 footprint compatibility	Supports automated placement and reflow on high-density boards without redesign

Applications

Power Supply Rail Clamping

ADC Reference Stabilization

Use Scenario: Protecting 3.3 V or 5 V microcontroller I/O pins from transient overvoltage events in industrial control panels.

IC Role / Device Role / Timing Role: Shunt clamping element placed between signal line and ground, conducting only when voltage exceeds 4.3 V.

Use Value: Limits peak voltage to 4.3 V ±2 % with ≤90 Ω dynamic impedance, preventing latch-up while adding <1 ns propagation delay.

Use Scenario: Providing stable 4.3 V reference for 12-bit SAR ADC in portable medical sensors.

IC Role / Device Role / Timing Role: Low-noise Zener source replacing TL431 where space and cost constrain active references.

Use Value: Delivers <3 μA leakage and −3.5 mV/K tempco, reducing full-scale error drift to <0.05 %/°C over 0–70 °C.

Low-Power Sensor Biasing

EEPROM Write Protection

Use Scenario: Biasing thermistor or photodiode front-end in battery-operated environmental monitors.

IC Role / Device Role / Timing Role: Precision current source via series resistor + Zener, delivering stable 50–200 μA bias.

Use Value: Maintains <±0.5 % bias current stability over temperature due to tight V_Z tolerance and low rdif.

Use Scenario: Enabling write-protection circuitry that disables EEPROM writes unless supply reaches ≥4.3 V.

IC Role / Device Role / Timing Role: Threshold detection element triggering MOSFET gate control logic upon valid V_CC.

Use Value: Provides sharp 4.3 V switching point with hard knee, eliminating need for external comparator or hysteresis network.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C4V3	Same 4.3 V, ±5 % tolerance; higher rdif (≤120 Ω); 200 mW rating	Acceptable where tighter voltage accuracy is not required and board space permits same SOT23 footprint	Select when cost sensitivity outweighs need for ±2 % regulation and low-impedance performance
MMSZ4685	4.3 V, ±5 %; 500 mW rating; higher leakage (≤10 μA @ 1 V); TO-236AB package	Higher power handling but larger footprint and looser tolerance limit use in precision low-leakage roles	Prefer only if thermal margin >250 mW is mandatory and PCB layout accommodates wider 2.9 mm × 1.3 mm vs. SOT23's 2.9 mm × 1.3 mm (identical outline but different leadform)

Compared with BZX84-C4V3 and MMSZ4685, PZU84-C4V3R delivers superior voltage accuracy (±2 % vs. ±5 %), lower dynamic impedance (≤90 Ω vs. ≥120 Ω), and lower leakage (≤3 μA vs. ≥10 μA), making it optimal for precision analog sensing and low-power reference applications where regulation stability is critical.

Availability

PZU84-C4V3R is available at Aetrix Electronics and suitable for precision voltage reference, low-power sensor biasing, and overvoltage clamping requiring stable component supply in consumer IoT, industrial monitoring, and portable medical devices.

Supply support for PZU84-C4V3R 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, headquartered in Nijmegen, Netherlands.

The PZU84 series belongs to Nexperia's general-purpose Zener regulator portfolio, engineered for stable voltage reference and clamping in space-constrained, low-power applications across consumer, industrial, and computing markets.

FAQ

What is the maximum reverse current the PZU84-C4V3R can handle continuously?

The device supports continuous reverse current up to 58 mA at 25 °C ambient, calculated from P_tot = 250 mW and V_Z ≈ 4.3 V (I_Z(max) = 250 mW / 4.3 V). Derating applies above 25 °C per R_th(j-a) = 500 K/W; at 70 °C ambient, max continuous I_Z drops to ~35 mA.

Does Pin 2 require PCB connection or grounding?

No - Pin 2 is internally not connected (n.c.) and must remain electrically floating. No PCB trace, solder pad, or thermal relief should be assigned to this terminal; routing or stencil design must exclude it to prevent unintended shorts or solder bridging.

How does temperature affect the 4.3 V Zener voltage?

At 25 °C, PZU84-C4V3R exhibits a temperature coefficient of −3.5 mV/K. Over 0–70 °C, this results in a total V_Z shift of approximately −245 mV (−3.5 mV/K × 70 K), yielding ~4.055 V at 70 °C - a deviation within ±6.5 % of nominal, consistent with its ±2 % room-temperature tolerance band.

Can PZU84-C4V3R replace a TL431 in low-current reference applications?

Yes, in cases where 4.3 V fixed reference suffices and active feedback isn't needed. Unlike TL431, PZU84-C4V3R requires no external resistors or compensation, draws zero quiescent current in non-conducting state, and fits SOT23 footprint - but lacks adjustable output and sink current capability beyond 58 mA.

PZU84-C4V3R 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):: 4.3 V

Tolerance:: ±5%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 90 Ohms

Current - Reverse Leakage @ Vr:: 3 µA @ 1 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-C4V3R FAQ

1.How can I place an order for PZU84-C4V3R through Aetrix?

Please submit a Request for Quotation (RFQ) for PZU84-C4V3R 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-C4V3R reliable?

The price and inventory of PZU84-C4V3R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-C4V3R is usually 5 days.

3.What payment methods are accepted for PZU84-C4V3R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-C4V3R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZU84-C4V3R?

PZU84-C4V3R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZU84-C4V3R 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-C4V3R?

For technical support, including PZU84-C4V3R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-C4V3R requirements.

6.How does Aetrix verify that PZU84-C4V3R is sourced from the original manufacturer or authorized distributors?

All PZU84-C4V3R 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-C4V3R meets industry standards.

7.What is the process for return or replacement of PZU84-C4V3R?

All PZU84-C4V3R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-C4V3R, 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-C4V3R part is unused and in its original packaging.

Return procedure for PZU84-C4V3R:

1.Submit a request within 90 days.

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

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