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

Nexperia USA Inc. BZX84W-C15X

Name: BZX84W-C15X
Brand: Nexperia USA Inc.
SKU: BZX84W-C15X
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84W-C15X

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-70, SOT-323

Datasheet:: BZX84W-C15X.pdf

Description:: DIODE ZENER 15V 275MW SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:2,663

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Product details

Overview

BZX84W-C15X from Nexperia is a ±5 % tolerance Zener voltage regulator diode with nominal 15 V breakdown voltage, 200 mA maximum forward current, 275 mW total power dissipation, and 200 Ω typical differential resistance at I_Z = 5 mA, used for precision voltage reference and overvoltage protection in low-power analog circuits.

For engineers reviewing the BZX84W-C15X datasheet, BZX84W-C15X pinout, BZX84W-C15X application, or BZX84W-C15X equivalent, this page delivers verified Zener parameters including V_Z = 15 V (±5 %), I_ZSM = 1.2 A (non-repetitive peak reverse), R_th(j-a) = 455 K/W, C_d = 2.0 pF at 1 MHz, and S_Z = +11.4 mV/K temperature coefficient - all confirmed per Nexperia Rev. 2 (Jan 2023) product data sheet.

Technical Context

This Zener diode operates in reverse-bias breakdown mode to maintain stable 15 V regulation across load and line variations, with a positive temperature coefficient (+11.4 mV/K) ensuring predictable drift in thermal environments up to 150 °C junction temperature.

Designed for surface-mount use in SOT323 (SC-70) packaging, it features a not-connected (n.c.) terminal (Pin 2), anode (Pin 1), and cathode (Pin 3), enabling compact placement in high-frequency signal paths where low capacitance (2.0 pF) and fast transient response are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
V_Z nominal	15 V ±5 % - precise regulation point for 15 V rail stabilization and reference generation
I_Z test current	5 mA - standard bias condition for specified V_Z, rdif, and temperature coefficient
r_dif	200 Ω max - low dynamic impedance ensures minimal output voltage variation under load changes
C_d	2.0 pF at 1 MHz, 0 V - ultra-low junction capacitance supports high-frequency filtering and RF bypass
S_Z	+11.4 mV/K - predictable positive temperature drift enables accurate thermal compensation in reference designs
P_tot	275 mW at T_amb = 25 °C on FR4 PCB - defines continuous power handling in standard board layout
I_ZSM	1.2 A (t_p = 100 µs) - surge capability for transient overvoltage clamping without failure

Pinout & Package

Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, 0.65 mm pitch, and 0.25 mm max height - optimized for automated reflow assembly and space-constrained PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward-bias connection; reverse-bias voltage applied between cathode and this terminal to initiate Zener conduction
2	Not Connected (n.c.)	Internally unconnected; must remain floating - no PCB trace or solder joint required
3	Cathode (K)	Reverse-bias input terminal; connects to regulated node or voltage rail requiring clamping/stabilization

Key Features

Feature	Design Value
Wide voltage range coverage	15 V nominal within E24 series (2.4 V–75 V), enabling standardized BOM across multiple supply rails
Tight tolerance option	±5 % (C-series) provides cost-effective balance of accuracy and manufacturability for non-critical references
Low junction capacitance	2.0 pF allows integration into RF detector circuits and high-speed signal conditioning without parasitic loading
Thermal stability	+11.4 mV/K coefficient enables predictable behavior in ambient ranges from −55 °C to +150 °C
High surge robustness	1.2 A non-repetitive peak reverse current (100 µs pulse) supports transient suppression in industrial I/O protection

Applications

Power Supply Reference

Overvoltage Clamp

Use Scenario: Providing stable 15 V reference for ADC voltage dividers and op-amp bias networks in battery-powered sensor nodes.

IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference potential relative to ground.

Use Value: Delivers 15 V ±5 % accuracy with <200 Ω dynamic impedance, minimizing reference error under varying load currents up to 5 mA.

Use Scenario: Protecting microcontroller GPIO pins from ESD-induced transients on 15 V auxiliary rails in industrial control modules.

IC Role / Device Role / Timing Role: Voltage-clamping device shunting excess energy to ground when rail exceeds 15.75 V (V_Zmax).

Use Value: Clamps surges up to 1.2 A (100 µs) while maintaining low leakage (<50 nA at 0.7×V_Z) during normal operation.

Signal Level Shifting

High-Frequency Biasing

Use Scenario: Establishing DC bias point for RF amplifier stages operating from 15 V supplies in wireless transceivers.

IC Role / Device Role / Timing Role: Zener-based bias network setting quiescent collector voltage in common-emitter transistor amplifiers.

Use Value: Enables stable bias despite supply ripple due to low r_dif (200 Ω) and negligible capacitance (2.0 pF) at 1 MHz.

Use Scenario: Generating clean 15 V local reference for clock buffer ICs in high-speed serial interface PCBs.

IC Role / Device Role / Timing Role: Low-noise voltage reference source decoupling timing circuitry from noisy digital power domains.

Use Value: Provides low-impedance, low-capacitance reference node with +11.4 mV/K thermal tracking to minimize jitter drift over temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84-C15	Same 15 V ±5 % rating but in SOT23 package; higher R_th(j-a) (500 K/W vs. 455 K/W); 3-pin fully connected (no n.c. terminal)	Less suitable for ultra-dense layouts due to larger SOT23 footprint; higher thermal resistance limits power handling in confined areas	Select when legacy SOT23 footprint compatibility is required and thermal margin exceeds 45 °C/W
MMSZ4688	15 V ±5 % in SOD-123; 500 mW P_tot; 100 Ω r_dif; 30 pF C_d; no n.c. pin	Higher power rating supports sustained 15 V regulation under heavier loads, but 30 pF capacitance degrades HF performance	Select for higher-power analog references where bandwidth <10 MHz and board space permits larger package

Compared with BZX84W-C15X, BZX84-C15 trades miniaturization for broader footprint compatibility, while MMSZ4688 sacrifices high-frequency suitability for greater steady-state power capacity - making BZX84W-C15X optimal for space- and bandwidth-constrained 15 V reference and clamp functions.

Availability

BZX84W-C15X is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and high-frequency biasing applications requiring stable component supply, consistent parametric performance, and SOT323-compatible automated assembly.

Supply support for BZX84W-C15X 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 BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation and transient suppression in consumer, industrial, and communication equipment operating across extended temperature ranges.

FAQ

What is the maximum reverse voltage before breakdown for BZX84W-C15X?

The nominal Zener voltage is 15 V with ±5 % tolerance, so the guaranteed breakdown range is 14.25 V to 15.75 V at I_Z = 5 mA. The absolute maximum non-repetitive peak reverse voltage is defined by the 1.2 A surge rating at 100 µs, corresponding to ~18 V instantaneous clamping under surge conditions per Nexperia's P_ZSM curve.

Can BZX84W-C15X be used in place of a 1N4744A?

No - the 1N4744A is a 14 V, 1 W through-hole Zener in DO-41 package with ±5 % tolerance and ~19 Ω r_dif. BZX84W-C15X has higher V_Z (15 V), lower power rating (275 mW), SOT323 packaging, and higher r_dif (200 Ω). Direct substitution requires verifying voltage match, thermal design, and PCB footprint compatibility.

What does the 'n.c.' pin mean in the BZX84W-C15X pinout?

Pin 2 is internally not connected - it serves only as a mechanical anchor in the SOT323 mold compound and carries no electrical function. It must remain unconnected on the PCB; no trace, pad, or solder joint should be assigned to this terminal to avoid unintended coupling or mechanical stress.

Is BZX84W-C15X suitable for automotive applications?

No - per Nexperia's Rev. 2 datasheet (Jan 2023), the BZX84W series is explicitly designated as non-automotive qualified. It lacks AEC-Q101 qualification, automotive-grade testing, and extended reliability validation. For automotive use, Nexperia offers separate -Q qualified variants such as BZX84W-C15-Q.

BZX84W-C15X Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: BZX84W

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 15 V

Tolerance:: ±5%

Power - Max:: 275 mW

Impedance (Max) (Zzt):: 30 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 10.5 V

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

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BZX84W-C15X FAQ

1.How can I place an order for BZX84W-C15X through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84W-C15X 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 BZX84W-C15X reliable?

The price and inventory of BZX84W-C15X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C15X is usually 5 days.

3.What payment methods are accepted for BZX84W-C15X?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C15X transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84W-C15X?

BZX84W-C15X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84W-C15X 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 BZX84W-C15X?

For technical support, including BZX84W-C15X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C15X requirements.

6.How does Aetrix verify that BZX84W-C15X is sourced from the original manufacturer or authorized distributors?

All BZX84W-C15X 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 BZX84W-C15X meets industry standards.

7.What is the process for return or replacement of BZX84W-C15X?

All BZX84W-C15X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C15X, 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 BZX84W-C15X part is unused and in its original packaging.

Return procedure for BZX84W-C15X:

1.Submit a request within 90 days.

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

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