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

Nexperia USA Inc. PZU84-B24R

Name: PZU84-B24R
Brand: Nexperia USA Inc.
SKU: PZU84-B24R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PZU84-B24R

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: PZU84-B24R.pdf

Description:: DIODE ZENER 24V 250MW TO236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PZU84-B24R from Nexperia is a ±2 % tolerance Zener voltage regulator diode with nominal 24 V breakdown voltage, designed for precision voltage reference and overvoltage protection in low-power analog and digital supply rails. It operates in SOT23 package, delivers 19 Ω typical differential resistance at I_Z = 5 mA, supports up to 200 mA forward current, and maintains stable regulation under ambient temperatures from −55 °C to +150 °C - commonly used in power supply feedback loops and sensor biasing circuits.

For engineers reviewing the PZU84-B24R datasheet, PZU84-B24R pinout, PZU84-B24R application, or PZU84-B24R equivalent, key selection criteria include Zener voltage tolerance (±2 %), low dynamic impedance (19 Ω @ 5 mA), thermal resistance (330 K/W junction-to-solder point), non-repetitive surge capability (40 W @ 100 μs), and SOT23 footprint compatibility with automated PCB assembly.

Technical Context

This Zener diode belongs to the PZU84-B series, optimized for low-leakage, sharp breakdown knee performance. Its 24 V nominal Zener voltage exhibits a temperature coefficient of +18.4 mV/K at I_Z = 5 mA and −5.3 mV/K at I_Z = 0.5 mA, enabling predictable drift compensation in temperature-sensitive references.

The device features a hard breakdown characteristic with <0.5 μA reverse leakage at VR = 19.2 V (80 % of V_Z), and achieves 80 pF capacitance at 0 V reverse bias - suitable for noise-sensitive regulation where parasitic coupling must be minimized.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	22.93 V to 25.57 V at I_Z = 5 mA - ensures tight 24 V regulation with ±2 % tolerance for stable reference generation
Differential Resistance r_dif	120 Ω max at I_Z = 5 mA - low impedance maintains output voltage stability under varying load currents
Reverse Leakage I_R	≤ 0.05 μA at V_R = 19.2 V - minimal standby current preserves efficiency in battery-powered systems
Power Dissipation P_tot	250 mW at T_amb = 25 °C on FR4 PCB - defines maximum continuous DC power handling in standard layout
Non-repetitive Surge P_ZSM	40 W at t_p = 100 μs - enables transient overvoltage clamping without failure during ESD or inductive spikes
Junction Temperature T_j	−55 °C to +150 °C - supports operation in extended industrial and automotive under-hood environments

Pinout & Package

Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch), rated for reflow and wave soldering per IPC-J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward-biased terminal; connects to lower-potential node in reverse-bias regulation configuration
2	Not Connected (n.c.)	Internally unconnected; must remain floating - no PCB trace or thermal pad connection permitted
3	Cathode (K)	Zener breakdown terminal; connects to regulated voltage rail and current-limiting resistor

Key Features

Feature	Design Value
±2 % Zener voltage tolerance	Enables high-accuracy voltage references without post-calibration in ADC references or DAC buffers
Hard breakdown knee	Ensures rapid, predictable transition into regulation - critical for clean overvoltage cutoff in LDO supervision
Low 19 Ω typical r_dif at 5 mA	Minimizes output voltage deviation across ±1 mA load current variation in feedback networks
0.05 μA max leakage at 80 % V_Z	Reduces quiescent current error in high-impedance bias networks for op-amp input stages
SOT23 footprint compatibility	Supports high-density routing and automated placement on space-constrained PCBs in IoT sensor nodes

Applications

Power Supply Feedback Regulation

Microcontroller Reset Voltage Reference

Use Scenario: Stabilizing feedback voltage in isolated flyback or buck converter secondary-side regulation.

IC Role / Device Role / Timing Role: Zener diode provides precise 24 V reference to optocoupler LED anode, setting primary-side duty cycle via TL431-like behavior.

Use Value: ±2 % tolerance and 120 Ω max r_dif ensure <±0.5 % output voltage drift across line/load/temperature variations.

Use Scenario: Generating a reliable reset threshold for 3.3 V or 5 V microcontrollers in industrial control modules.

IC Role / Device Role / Timing Role: Configured as shunt regulator with resistor divider to produce accurate 2.4 V or 3.0 V reset voltage for external supervisor ICs.

Use Value: Low 0.05 μA leakage prevents divider current error, preserving reset accuracy down to −40 °C ambient.

Sensor Biasing Network

ESD Protection Clamp

Use Scenario: Providing stable excitation voltage to resistive temperature detectors (RTDs) or strain gauges in measurement front-ends.

IC Role / Device Role / Timing Role: Acts as low-noise, low-drift voltage source in Wheatstone bridge bias leg, directly referenced to ADC VREF.

Use Value: 18.4 mV/K temperature coefficient allows predictable drift compensation when paired with matched NTC thermistors.

Use Scenario: Clamping transient surges on low-speed analog signal lines (e.g., RS-485, CAN transceiver I/O).

IC Role / Device Role / Timing Role: Placed between signal line and ground to divert ESD pulses exceeding 24 V, protecting downstream receivers.

Use Value: 40 W non-repetitive surge rating handles IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) without degradation.

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-C24	±5 % tolerance, 22.8–25.2 V range; higher 200 Ω r_dif at 5 mA; 100 nA leakage at 19.2 V	Acceptable for non-critical biasing but insufficient for precision feedback loops requiring <±0.5 % output stability	Select when cost sensitivity outweighs regulation accuracy and leakage constraints
MMSZ4686	±5 % tolerance, 22.8–25.2 V range; 200 Ω r_dif; 100 nA leakage; SOD-123 package (larger footprint)	Requires PCB redesign due to different land pattern; thermal resistance ~400 K/W limits power handling in dense layouts	Choose only if legacy SOD-123 footprint must be retained and ±5 % tolerance is acceptable

Compared with BZX84-C24 and MMSZ4686, PZU84-B24R offers tighter tolerance, lower dynamic impedance, and superior thermal performance in SOT23 - making it optimal for space-constrained, high-accuracy regulation where board area and long-term stability are prioritized.

Availability

PZU84-B24R is available at Aetrix Electronics and suitable for power supply feedback regulation, microcontroller reset reference generation, sensor biasing networks, and ESD protection clamping requiring stable component supply across industrial, instrumentation, and IoT product lifecycles.

Supply support for PZU84-B24R 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 and industrial-grade components.

The PZU84 series belongs to Nexperia's precision Zener regulator portfolio, engineered specifically for applications demanding low-leakage, sharp-knee breakdown, and robust surge immunity in compact SMT packages.

FAQ

What is the maximum continuous power dissipation for PZU84-B24R at 70 °C ambient?

At T_amb = 70 °C, derated power is calculated using R_th(j-a) = 500 K/W: P_tot = (T_j(max) − T_amb) / R_th(j-a) = (150 − 70) / 500 = 160 mW. This assumes free-air convection; PCB copper area increases effective dissipation.

Can PZU84-B24R replace a 24 V Zener in a TL431-based shunt regulator?

Yes - its 22.93–25.57 V V_Z range and low r_dif allow direct substitution as the reference element. However, unlike TL431, it lacks active gain; use only where passive regulation suffices and load current remains below 5 mA.

Is Pin 2 truly unconnected, or can it be used for thermal relief?

Pin 2 is internally not connected per Nexperia's pinning diagram and must remain electrically floating. Connecting it to ground or copper pour violates the SOT23 mechanical design and risks internal shorting - thermal relief must be achieved via Pad 3 (cathode) only.

How does temperature affect the 24 V Zener voltage in practical operation?

At I_Z = 5 mA, the temperature coefficient is +18.4 mV/K, meaning V_Z increases by ~1.84 V over a 100 °C rise (e.g., 24.0 V at 25 °C → ~25.8 V at 125 °C). For stable references, operate near 25 °C or compensate using matched NTC networks.

PZU84-B24R 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):: 24 V

Tolerance:: ±2%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 30 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 19 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-B24R FAQ

1.How can I place an order for PZU84-B24R through Aetrix?

Please submit a Request for Quotation (RFQ) for PZU84-B24R 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-B24R reliable?

The price and inventory of PZU84-B24R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PZU84-B24R is usually 5 days.

3.What payment methods are accepted for PZU84-B24R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PZU84-B24R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PZU84-B24R?

PZU84-B24R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PZU84-B24R 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-B24R?

For technical support, including PZU84-B24R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PZU84-B24R requirements.

6.How does Aetrix verify that PZU84-B24R is sourced from the original manufacturer or authorized distributors?

All PZU84-B24R 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-B24R meets industry standards.

7.What is the process for return or replacement of PZU84-B24R?

All PZU84-B24R units undergo pre-shipment inspection (PSI). If there is an issue with PZU84-B24R, 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-B24R part is unused and in its original packaging.

Return procedure for PZU84-B24R:

1.Submit a request within 90 days.

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

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