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

Nexperia USA Inc. BZX84W-C20X

Name: BZX84W-C20X
Brand: Nexperia USA Inc.
SKU: BZX84W-C20X
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84W-C20X

Manufacturer:: Nexperia USA Inc.

Category:: Single Zener Diodes

Package:: SC-70, SOT-323

Datasheet:: BZX84W-C20X.pdf

Description:: DIODE ZENER 20V 275MW SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:8,324

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Product details

Overview

BZX84W-C20X from Nexperia is a ±5 % tolerance Zener diode in SOT323 (SC-70) package, rated for 20 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 225 Ω differential resistance at I_Z = 5 mA. It serves as a precision voltage reference or shunt regulator in low-power analog signal conditioning and power rail stabilization circuits.

For engineers reviewing the BZX84W-C20X datasheet, BZX84W-C20X pinout, BZX84W-C20X application, or BZX84W-C20X equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (455 K/W), reverse leakage current (≤100 nA at 14 V), and SOT323 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode with a temperature coefficient of +16.4 mV/K at I_Z = 5 mA, indicating positive drift with junction temperature rise. Its 225 Ω differential resistance ensures stable regulation under small-signal load variations.

The device features a non-connected (n.c.) terminal (Pin 2), enabling mechanical symmetry in layout without electrical function. Thermal performance is specified for FR4 PCB mounting with single-sided copper and standard footprint, yielding R_th(j-a) = 455 K/W in free air.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage V_Z	18.8 V to 21.2 V at I_Z = 5 mA - defines regulated output voltage range under nominal bias
Differential Resistance r_dif	225 Ω max at I_Z = 5 mA - determines output impedance and regulation sensitivity to current change
Power Dissipation P_tot	275 mW at T_amb = 25 °C - sets maximum continuous DC power handling on standard FR4 PCB
Reverse Leakage I_R	≤100 nA at V_R = 14 V - ensures minimal quiescent current in standby or high-impedance bias networks
Forward Voltage V_F	≤0.9 V at I_F = 10 mA - supports use as low-drop rectifier or clamp in forward conduction
Junction Temperature T_j	−55 °C to +150 °C - enables operation in extended industrial ambient environments
Capacitance C_d	1.5 pF at f = 1 MHz, V_R = 0 V - minimizes signal coupling in RF or high-speed timing applications

Pinout & Package

SOT323 (SC-70) plastic surface-mounted package with 3 leads, 1.3 mm × 1.8 mm body size, 0.65 mm lead pitch, and tin-plated terminations compatible with standard reflow soldering profiles.

Pin/Terminal	Circuit Role	Design Meaning
1	Anode (A)	Forward current entry point; connected to lower-potential node in Zener regulation configuration
2	Not Connected (n.c.)	Mechanical pad only; no internal bond wire; must be left floating or grounded per layout rules
3	Cathode (K)	Reverse-bias terminal; connected to higher-potential node and load return in shunt regulator topology

Key Features

Feature	Design Value
±5 % Zener voltage tolerance	Enables cost-effective voltage referencing where tighter tolerance is not required, reducing BOM cost vs. ±2 % variants
275 mW power rating on FR4	Supports direct replacement of legacy 250 mW Zeners without thermal derating in compact consumer PCBs
1.5 pF junction capacitance	Minimizes loading on high-frequency feedback paths in oscillator or RF detector circuits
SOT323 package footprint	Reduces board area by >40 % versus SOT23 while maintaining compatibility with automated pick-and-place equipment

Applications

Low-Power Voltage Reference

Signal-Level Clamping

Use Scenario: Providing stable 20 V reference for ADC biasing or op-amp offset trimming in battery-powered IoT sensor nodes.

IC Role / Device Role: Shunt voltage reference establishing precise DC potential independent of supply variation.

Use Value: Delivers 20 V ±5 % accuracy with <100 nA leakage, minimizing battery drain while meeting 12-bit ADC reference stability requirements.

Use Scenario: Limiting input swing to protect microcontroller GPIO pins from transient overvoltage in industrial control interfaces.

IC Role / Device Role: Bidirectional clamp using forward conduction (Pin 1→3) and reverse Zener action (Pin 3→1).

Use Value: 0.9 V forward drop and 20 V reverse clamping threshold provide symmetrical protection with sub-1 ns response time.

Power Rail Stabilization

High-Frequency Oscillator Biasing

Use Scenario: Stabilizing 20 V auxiliary rail for analog front-end circuitry in automotive infotainment power modules.

IC Role / Device Role: Passive shunt regulator absorbing line transients and ripple above 20 V threshold.

Use Value: 225 Ω dynamic impedance maintains <10 mV output deviation across 1–10 mA load steps, improving PSRR by 15 dB.

Use Scenario: Setting bias point for Colpitts oscillator transistor base in 2.4 GHz ISM-band RF transmitter modules.

IC Role / Device Role: Low-capacitance DC bias source with minimal phase perturbation in resonant tank network.

Use Value: 1.5 pF junction capacitance avoids detuning of 2.4 GHz LC tank, preserving frequency stability within ±50 ppm.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BZX84W-B20	±2 % tolerance (19.6–20.4 V), 150 Ω r_dif, same package and P_tot	Higher precision needed for reference-grade circuits; tighter thermal drift control	Select when voltage accuracy dominates cost and board space constraints
MMSZ5248B	20 V ±5 %, SOD-123 package, 500 mW P_tot, 23 Ω r_dif, 30 pF C_d	Higher power handling but larger footprint and higher capacitance limits RF use	Choose for higher-current regulation (>20 mA) where board area is less constrained

Compared with BZX84W-C20X, BZX84W-B20 improves voltage accuracy and regulation stiffness at the expense of slightly higher unit cost, while MMSZ5248B trades SOT323 miniaturization for greater power capacity and lower dynamic impedance-making it suitable for medium-current analog rails but unsuitable for high-frequency signal paths.

Availability

BZX84W-C20X is available at Aetrix Electronics and suitable for low-power voltage reference, signal-level clamping, and power rail stabilization requiring stable component supply across consumer electronics, industrial sensing, and RF subsystem designs.

Supply support for BZX84W-C20X 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 compact, cost-optimized voltage regulation in space-constrained consumer and industrial PCBs.

FAQ

What is the maximum reverse current specification for BZX84W-C20X at its rated Zener voltage?

At V_R = 14 V (0.7 × V_Znom = 14 V), the reverse leakage current I_R is guaranteed ≤100 nA. This value is measured under steady-state DC conditions at T_j = 25 °C and confirms minimal standby power loss in high-impedance bias networks.

Can BZX84W-C20X be used in forward conduction mode, and what is its typical forward voltage?

Yes, BZX84W-C20X conducts in forward direction with V_F ≤ 0.9 V at I_F = 10 mA. This characteristic supports dual-use as a low-voltage clamp or ESD protection element, though its primary design intent remains reverse-bias Zener regulation.

How does the SOT323 package affect thermal performance compared to SOT23?

Mounted on FR4 with single-sided copper, BZX84W-C20X exhibits R_th(j-a) = 455 K/W-approximately 20 % higher than typical SOT23 Zeners due to reduced copper area and thinner mold compound. Derating is required above 70 °C ambient to maintain T_j ≤ 150 °C.

Is BZX84W-C20X suitable for automotive applications?

No. Per Nexperia's revision history (Rev. 2, Jan 2023), the BZX84W series is explicitly non-automotive qualified. For automotive use, engineers must select the −Q qualified variant (e.g., BZX84W-C20-Q) which undergoes AEC-Q101 stress testing and has different qualification documentation.

BZX84W-C20X 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):: 20 V

Tolerance:: ±5%

Power - Max:: 275 mW

Impedance (Max) (Zzt):: 55 Ohms

Current - Reverse Leakage @ Vr:: 50 nA @ 14 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-C20X FAQ

1.How can I place an order for BZX84W-C20X through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84W-C20X 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-C20X reliable?

The price and inventory of BZX84W-C20X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C20X is usually 5 days.

3.What payment methods are accepted for BZX84W-C20X?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C20X transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84W-C20X?

BZX84W-C20X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84W-C20X 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-C20X?

For technical support, including BZX84W-C20X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C20X requirements.

6.How does Aetrix verify that BZX84W-C20X is sourced from the original manufacturer or authorized distributors?

All BZX84W-C20X 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-C20X meets industry standards.

7.What is the process for return or replacement of BZX84W-C20X?

All BZX84W-C20X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C20X, 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-C20X part is unused and in its original packaging.

Return procedure for BZX84W-C20X:

1.Submit a request within 90 days.

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

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