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

Diodes Incorporated BZX84C20W-7-F

Name: BZX84C20W-7-F
Brand: Diodes Incorporated
SKU: BZX84C20W-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BZX84C20W-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Zener Diodes

Package:: SC-70, SOT-323

Datasheet:: BZX84C20W-7-F.pdf

Description:: DIODE ZENER 20V 200MW SOT323

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Inventory:3,000

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Product details

Overview

BZX84C20W-7-F from Diodes Incorporated is a 20 V, 200 mW surface-mount Zener diode in SOT-323 package, rated for 5 mA test current with 18.8–21.2 V zener voltage range, 55 Ω maximum zener impedance at 5 mA, and −0.1 µA reverse leakage at 14 V, used for precision voltage regulation and reference in low-power analog circuits.

For engineers reviewing the BZX84C20W-7-F datasheet, BZX84C20W-7-F pinout, BZX84C20W-7-F application, or BZX84C20W-7-F equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at operating current, thermal resistance (625 K/W), reverse leakage at rated VR, and SOT-323 footprint compatibility with high-density PCB layouts.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. It features planar die construction for consistent parametric performance and is characterized at 25°C with specified limits for zener voltage, impedance, and leakage across the full operating temperature range (−65°C to +125°C).

Its thermal resistance of 625 K/W reflects dissipation capability on FR4 board with recommended pad layout; power derating begins above 25°C ambient, reaching zero dissipation at 150°C. The device uses matte tin-plated Alloy 42 leads and green molding compound compliant with UL 94V-0 and RoHS.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	20 V nominal, 18.8–21.2 V min/max at I_ZT = 5 mA - defines regulation setpoint tolerance for feedback or reference use
Power Dissipation (P_D)	200 mW at T_A = 25°C - sets maximum continuous DC or pulsed power handling on standard FR4
Zener Impedance (Z_ZT)	55 Ω max at I_ZT = 5 mA, f = 1 kHz - determines output voltage stability under small-signal load variation
Reverse Leakage (I_R)	0.1 µA max at V_R = 14 V - ensures minimal error current in high-impedance bias/reference networks
Thermal Resistance (R_θJA)	625 K/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design margin
Operating Temperature	−65°C to +125°C - supports industrial and automotive under-hood applications without derating loss

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount case (2.0 × 1.25 × 0.9 mm), lead-free, RoHS-compliant, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
Anode (A)	Forward conduction terminal / cathode reference ground path	Connected to lower-potential node in reverse-biased regulation configuration; polarity marked on top surface
Cathode (K)	Zener breakdown terminal / regulated output node	Connected to input supply; voltage at this terminal clamps to V_Z when reverse biased above knee voltage
Case / Not connected	Non-electrical mechanical interface	SOT-323 has no internal thermal pad or exposed metal; thermal path relies solely on leadframe conduction

Key Features

Feature	Design Value
Planar die construction	Ensures tight V_Z distribution and repeatable Z_ZT across production lots for batch-critical references
Green molding compound	Halogen-free, UL 94V-0 rated material eliminates flame retardant toxicity concerns in enclosed assemblies
Lead-free matte tin plating	Compatible with Pb-free reflow profiles and prevents intermetallic growth during thermal cycling
Low reverse leakage	0.1 µA max at 70% of V_Z enables use in microamp-level bias networks without loading error

Applications

Power Supply Reference

Overvoltage Clamp

Use Scenario: Providing stable 20 V reference for ADC voltage dividers or op-amp feedback networks in battery-powered sensors.

IC Role / Device Role / Timing Role: Zener diode functions as two-terminal shunt voltage reference, absorbing excess current to hold node voltage constant.

Use Value: Delivers ±5.6% V_Z tolerance and 55 Ω dynamic impedance to limit reference drift under 100 µA load variation.

Use Scenario: Protecting microcontroller I/O pins from transient overvoltage events up to ±30 V in industrial control interfaces.

IC Role / Device Role / Timing Role: Acts as passive crowbar element, conducting when line voltage exceeds 21.2 V to divert surge current.

Use Value: Clamps within 100 ns with <0.1 µA standby leakage, minimizing signal distortion during normal operation.

Current Source Bias

Temperature-Stable Reference

Use Scenario: Setting bias current for low-noise JFET amplifiers in audio front-end stages.

IC Role / Device Role / Timing Role: Forms constant-current sink via series resistor and Zener-regulated voltage drop.

Use Value: Maintains 5 mA test current with <±0.5% drift from −40°C to +85°C due to compensated TC (−0.1 to +0.2 mV/°C).

Use Scenario: Generating stable 20 V reference for precision DACs in medical instrumentation requiring long-term calibration stability.

IC Role / Device Role / Timing Role: Serves as primary voltage基准 in ratiometric measurement chains where absolute accuracy is secondary to repeatability.

Use Value: Achieves <10 ppm/°C effective TC when operated at 5 mA and thermally anchored to ground plane.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBZ5242BS-7-F	Zener voltage 12 V, 225 mW P_D, 30 Ω Z_ZT at 20 mA, SOT-323	Lower voltage, higher test current - suited for 12 V rail clamping, not direct 20 V replacement	Select only if system requires 12 V regulation and can accommodate higher I_ZT drive capability
BZX84-C20LT1G	Same 20 V V_Z, 350 mW P_D, 50 Ω Z_ZT at 5 mA, SOT-23	Larger SOT-23 footprint, higher power rating - better for thermally constrained but space-tolerant designs	Choose when board layout allows SOT-23 and thermal margin must exceed 200 mW at elevated ambient

Compared with MMBZ5242BS-7-F and BZX84-C20LT1G, BZX84C20W-7-F offers optimal balance of 20 V precision, SOT-323 miniaturization, and 200 mW dissipation for space-constrained 20 V reference or clamp roles where thermal mass is limited.

Availability

BZX84C20W-7-F is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, current source biasing, and temperature-stable analog circuitry requiring stable component supply across production lifecycles.

Supply support for BZX84C20W-7-F 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets with high-reliability components.

The BZX84 series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, space-efficient voltage regulation and protection in high-volume consumer and industrial electronics.

FAQ

What is the maximum reverse voltage before breakdown for BZX84C20W-7-F?

The nominal zener voltage is 20 V with a guaranteed range of 18.8 V to 21.2 V at 5 mA test current. Breakdown occurs sharply within this band; operation below 18.8 V yields negligible conduction, while voltages above 21.2 V ensure full regulation. The device is not rated for sustained reverse voltage beyond 21.2 V without current limiting.

Can BZX84C20W-7-F be used in place of a 20 V Zener in an existing SOT-23 design?

No - BZX84C20W-7-F uses SOT-323, which has different pad dimensions (2.0 × 1.25 mm vs. SOT-23's 2.9 × 1.3 mm) and pin spacing (1.9 mm vs. 2.3 mm). Direct substitution requires PCB land pattern revision. Electrical parameters are similar to SOT-23 equivalents like BZX84-C20LT1G, but mechanical fit is not interchangeable.

What is the temperature coefficient behavior near 20 V?

At 20 V nominal, the temperature coefficient is specified as −0.1 to +0.2 mV/°C at I_ZT = 5 mA. This translates to approximately ±100 ppm/°C drift, making it suitable for moderate-precision references where ambient shifts up to 50°C occur. Coefficient improves slightly at higher currents but is not characterized beyond 5 mA in the datasheet.

Is BZX84C20W-7-F suitable for ESD protection?

No - it is not designed or characterized for ESD immunity or transient suppression. Its 200 mW rating and 55 Ω impedance are optimized for steady-state regulation, not nanosecond-scale transients. For ESD, use dedicated TVS diodes such as D3V3M1U2LP-7 or SP1003-01UTG, which specify clamping voltage, peak pulse power, and IEC 61000-4-2 ratings.

BZX84C20W-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: BZX84CxxxLT1G

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

Packaging:: Tape & Reel (TR)

Product Status:: Active

Voltage - Zener (Nom) (Vz):: 20 V

Tolerance:: ±6%

Power - Max:: 200 mW

Impedance (Max) (Zzt):: 55 Ohms

Current - Reverse Leakage @ Vr:: 100 nA @ 14 V

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

Operating Temperature:: -65°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323

BZX84C20W-7-F FAQ

1.How can I place an order for BZX84C20W-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BZX84C20W-7-F 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 BZX84C20W-7-F reliable?

The price and inventory of BZX84C20W-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C20W-7-F is usually 5 days.

3.What payment methods are accepted for BZX84C20W-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C20W-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BZX84C20W-7-F?

BZX84C20W-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BZX84C20W-7-F 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 BZX84C20W-7-F?

For technical support, including BZX84C20W-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C20W-7-F requirements.

6.How does Aetrix verify that BZX84C20W-7-F is sourced from the original manufacturer or authorized distributors?

All BZX84C20W-7-F 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 BZX84C20W-7-F meets industry standards.

7.What is the process for return or replacement of BZX84C20W-7-F?

All BZX84C20W-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C20W-7-F, 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 BZX84C20W-7-F part is unused and in its original packaging.

Return procedure for BZX84C20W-7-F:

1.Submit a request within 90 days.

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

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