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

Nexperia USA Inc. BZX84-A24,215

Name: BZX84-A24,215
Brand: Nexperia USA Inc.
SKU: BZX84-A24,215
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84-A24,215

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

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

Datasheet:: BZX84-A24,215.pdf

Description:: DIODE ZENER 24V 250MW TO236AB

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Product details

Overview

BZX84-A24,215 from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOT23 (TO-236AB) package, rated for 24 V nominal breakdown voltage at 5 mA, 250 mW total power dissipation, and 16.8 mV/K temperature coefficient - used for precision voltage reference and overvoltage protection in low-power analog sensor interfaces and microcontroller I/O rail clamping.

For engineers reviewing the BZX84-A24,215 datasheet, BZX84-A24,215 pinout, BZX84-A24,215 application, or BZX84-A24,215 equivalent, this page delivers verified Zener parameters, terminal mapping, thermal resistance values, reverse current behavior at 22.8–25.6 V, and validated alternatives for ±1 % regulation in space-constrained PCB designs.

Technical Context

This device operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener knee voltage. Its 24 V nominal working voltage is defined at I_Z = 5 mA with ±1 % tolerance, and exhibits a positive temperature coefficient of +16.8 mV/K across the operating range.

Designed for surface-mount use on FR4 PCBs with single-sided 70 µm copper, it delivers 250 mW continuous dissipation and withstands non-repetitive 40 W reverse surges (100 µs, square wave), with junction-to-ambient thermal resistance of 500 K/W in free air.

Key Specifications

Parameter	Value and Actual Design Meaning
Breakdown Voltage (V_Z)	23.76 V to 24.24 V at I_Z = 5 mA - ensures tight 24 V regulation for reference circuits requiring <±0.5 V drift.
Power Dissipation (P_tot)	250 mW at T_amb ≤ 25 °C - limits continuous bias current to ~10.4 mA at 24 V, defining safe DC operating envelope.
Forward Voltage (V_F)	≤ 0.9 V at I_F = 10 mA - enables low-loss forward conduction during transient clamping or polarity protection.
Temperature Coefficient (S_Z)	+16.8 mV/K at I_Z = 5 mA - quantifies voltage drift per degree rise, critical for temperature-stable references.
Differential Resistance (r_dif)	250 Ω max - determines regulation stiffness; lower r_dif yields smaller output variation under load changes.
Reverse Current (I_R)	≤ 0.05 µA at V_R = 19.2 V - defines leakage below knee, essential for low-power standby mode integrity.
Non-repetitive Peak Power	40 W for 100 µs - supports ESD/transient suppression without failure when paired with series impedance.

Pinout & Package

SOT23 (TO-236AB) plastic surface-mounted package with 3 leads; 1.3 mm × 2.9 mm footprint, 1.1 mm height, and standard reflow-compatible solder pads.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Connected to lower-potential node; reverse-biased during regulation; carries forward current during fault conditions.
2	Not Connected (n.c.)	Internally unconnected; must remain floating - no PCB trace or thermal pad should tie to this terminal.
3	Cathode (K)	Connected to regulated voltage rail; source of Zener current; primary thermal path to PCB solder point (R_th(j-sp) = 330 K/W).

Key Features

Feature	Design Value
±1 % Zener tolerance	Enables direct replacement in precision 24 V reference designs without recalibration or resistor trimming.
250 mW power rating	Supports regulation in battery-powered sensors and IoT nodes where thermal mass is limited and airflow absent.
Low 0.05 µA reverse leakage	Preserves battery life in always-on monitoring circuits by minimizing quiescent current draw below V_Z.
40 W surge capability	Provides robustness against IEC 61000-4-2 Level 4 ESD events when used with 100 Ω series resistor.
SOT23 footprint compatibility	Allows drop-in integration into legacy designs using industry-standard pick-and-place equipment and reflow profiles.

Applications

Industrial Sensor Signal Conditioning

Microcontroller I/O Protection

Use Scenario: Stabilizing excitation voltage for 4–20 mA loop-powered pressure transmitters with ±0.1 % accuracy requirement.

IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 24 V bias to bridge sensor and instrumentation amplifier.

Use Value: ±1 % V_Z tolerance eliminates need for external trimming resistors, reducing BOM count and calibration steps.

Use Scenario: Clamping GPIO pins of ARM Cortex-M0+ MCUs exposed to 24 V field wiring in building automation panels.

IC Role / Device Role / Timing Role: Bidirectional overvoltage protector limiting pin voltage to 24.24 V during surge events.

Use Value: 40 W non-repetitive peak power rating absorbs 1 kV ESD pulses without degradation when series impedance ≥ 100 Ω.

Low-Power Battery Monitoring

Programmable Logic Controller (PLC) Input Stage

Use Scenario: Scaling Li-ion battery pack voltage (up to 25.2 V) to ADC input range of ultra-low-power MSP430 MCU.

IC Role / Device Role / Timing Role: Precision divider reference enabling accurate state-of-charge estimation at sub-10 µA quiescent current.

Use Value: 0.05 µA reverse leakage at 19.2 V ensures <1 nA loading error on high-impedance voltage dividers.

Use Scenario: Providing 24 V logic-level threshold detection for discrete 24 V DC inputs in DIN-rail mounted PLC modules.

IC Role / Device Role / Timing Role: Threshold clamp establishing clean digital transition point for optocoupler input stages.

Use Value: 250 Ω max differential resistance minimizes hysteresis-induced jitter in edge-triggered input sampling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBZ5248BS-7-F	24 V ±5 % tolerance, 350 mW P_tot, SOT23 package, 100 Ω r_dif	Higher power and looser tolerance suit cost-sensitive industrial controls where calibration is performed post-assembly.	Select when absolute regulation accuracy is secondary to surge margin and long-term stability under thermal cycling.
Vishay BZX84-C24-TP	24 V ±5 % tolerance, 300 mW P_tot, same SOT23 footprint, 200 Ω r_dif	Higher leakage (≤1 µA at 19.2 V) and wider tolerance limit use in battery-critical or precision reference roles.	Choose only if design already accommodates ±5 % V_Z variation and requires higher continuous power headroom.

Compared with BZX84-A24,215, the MMBZ5248BS-7-F offers greater surge resilience but sacrifices regulation precision, while the BZX84-C24-TP trades tolerance and leakage performance for marginal power uplift - making the A-grade part optimal for uncalibrated, low-leakage 24 V references.

Availability

BZX84-A24,215 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, microcontroller I/O protection, low-power battery monitoring, and PLC input stage designs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for BZX84-A24,215 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 logic, discrete, and MOSFET solutions, with manufacturing rooted in process control and automotive-grade quality systems.

The BZX84 series belongs to Nexperia's precision Zener portfolio designed specifically for space-constrained, low-power voltage regulation and clamping in consumer, industrial, and communication equipment.

FAQ

What is the maximum continuous reverse current at 24 V regulation?

At 24 V and 25 °C ambient, the maximum continuous reverse current is 10.4 mA - derived from P_tot = 250 mW divided by V_Z = 24 V. This assumes no additional thermal derating; actual usable current drops to ~7.5 mA at 70 °C ambient due to R_th(j-a) = 500 K/W.

Can BZX84-A24,215 be used in place of a 24 V Zener with ±5 % tolerance?

Yes, but only if the circuit tolerates tighter regulation and lower leakage. Its ±1 % tolerance and 0.05 µA IR at 19.2 V improve accuracy and standby efficiency versus ±5 % parts, though its 250 mW rating is 17 % lower than typical ±5 % SOT23 Zeners - verify power margins in high-current bias networks.

Is Pin 2 truly unconnected, or does it serve a thermal function?

Pin 2 is electrically and physically unconnected - no internal bond wire or die attachment exists. It must remain floating per datasheet; connecting it risks shorting adjacent traces or violating creepage requirements. Thermal transfer occurs exclusively through Pins 1 (anode) and 3 (cathode), with cathode being the dominant path (R_th(j-sp) = 330 K/W).

How does temperature affect regulation accuracy above 25 °C?

With a +16.8 mV/K temperature coefficient, V_Z increases by ~1.7 V from 25 °C to 125 °C junction temperature. At I_Z = 5 mA, this yields a shift from 24.0 V to ~25.7 V - requiring thermal design to limit T_j rise or system-level compensation if sub-1 % stability is required across full operating range.

BZX84-A24,215 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX84

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 24 V

Tolerance:: ±1%

Power - Max:: 250 mW

Impedance (Max) (Zzt):: 70 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 700 mV

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

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

BZX84-A24,215 FAQ

1.How can I place an order for BZX84-A24,215 through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84-A24,215 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 BZX84-A24,215 reliable?

The price and inventory of BZX84-A24,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-A24,215 is usually 5 days.

3.What payment methods are accepted for BZX84-A24,215?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-A24,215 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84-A24,215?

BZX84-A24,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84-A24,215 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 BZX84-A24,215?

For technical support, including BZX84-A24,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-A24,215 requirements.

6.How does Aetrix verify that BZX84-A24,215 is sourced from the original manufacturer or authorized distributors?

All BZX84-A24,215 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 BZX84-A24,215 meets industry standards.

7.What is the process for return or replacement of BZX84-A24,215?

All BZX84-A24,215 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-A24,215, 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 BZX84-A24,215 part is unused and in its original packaging.

Return procedure for BZX84-A24,215:

1.Submit a request within 90 days.

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

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