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HomeProductsDiscrete Semiconductor ProductsDiodes - Zener - SingleBZX84C20-7-F-79
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BZX84C20-7-F-79 - Diodes Incorporated

Manufacturer Part Number
BZX84C20-7-F-79
Manufacturer
Diodes Incorporated
Allelco Part Number
98D-BZX84C20-7-F-79
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,755 pcs available, New & Original
Parts Description
DIODE ZENER 20V 300MW SOT23
Package
SOT-23-3
Data sheet
BZX84C20-7-F-79.pdf

PCN Obsolescence/ EOL

Mult Dev EOL 28/May/2020.pdf

Environmental Information

Diodes Environmental Compliance Cert.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 4755

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Specifications

BZX84C20-7-F-79 Tech Specifications
Diodes Incorporated - BZX84C20-7-F-79 technical specifications, attributes, parameters and parts with similar specifications to Diodes Incorporated - BZX84C20-7-F-79

Product Attribute Attribute Value
Manufacturer Diodes Incorporated
Voltage - Zener (Nom) (Vz) 20 V
Voltage - Forward (Vf) (Max) @ If 900 mV @ 10 mA
Tolerance ±6%
Supplier Device Package SOT-23-3
Series -
Power - Max 300 mW
Product Attribute Attribute Value
Package / Case TO-236-3, SC-59, SOT-23-3
Package Tape & Reel (TR)
Operating Temperature -65°C ~ 150°C (TJ)
Mounting Type Surface Mount
Impedance (Max) (Zzt) 55 Ohms
Current - Reverse Leakage @ Vr 100 nA @ 14 V
Base Product Number BZX84

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99

Frequently Asked Questions(FAQ)

What are the key differences between the BZX84C20-7-F-79 and similar Zener diodes in terms of voltage regulation stability under varying load conditions?
The BZX84C20-7-F-79 exhibits a Zener impedance (Zzt) of 55 ohms, which directly influences its ability to maintain stable 20V regulation across different loads. Compared to higher-impedance alternatives, this value indicates relatively good dynamic performance, though it may still introduce noticeable voltage droop under high transient currents due to internal resistance effects. For applications requiring tight regulation below 10mA, this device performs adequately, but designers should consider additional filtering or buffering when driving capacitive loads or handling rapid current changes.
How does the power dissipation rating of the BZX84C20-7-F-79 impact thermal management in compact PCB layouts?
With a maximum power rating of 300 mW, the BZX84C20-7-F-79 must be used within a safe operating area that accounts for ambient temperature and trace conductivity. In typical surface-mount configurations, derating above 70°C junction temperature is necessary unless using copper pours or thermal vias. At full 300mW dissipation, the device would require careful layout to avoid localized heating, especially in dense designs where adjacent components might experience elevated temperatures due to shared thermal mass.
When selecting between the BZX84C20-7-F-79 and alternative part numbers like BZX84C20Q-13-F, what supply chain considerations should influence the choice?
While functionally equivalent, the BZX84C20Q-13-F is packaged for tape-and-reel delivery suitable for automated assembly, whereas the BZX84C20-7-F-79 typically ships loose or in cut tape. This affects procurement lead times and handling costs. Additionally, regional availability varies—some distributors prioritize certain suffix codes based on warehouse inventory. Engineers should verify current distributor stock levels and minimum order quantities before finalizing selection, particularly in high-volume production environments.
What precautions should be taken when using the BZX84C20-7-F-79 in switching regulator feedback networks?
Due to its 55-ohm dynamic impedance and ±6% tolerance, the BZX84C20-7-F-79 can introduce ripple into feedback paths if not properly decoupled. In switching regulators, even small voltage fluctuations at the reference node can degrade output accuracy. It is advisable to place a ceramic bypass capacitor (e.g., 100nF) close to the cathode and ensure the bias current remains well above the knee current to minimize noise sensitivity. Avoid using this diode as the sole regulation element in precision systems.
Can the BZX84C20-7-F-79 safely operate near its maximum junction temperature without significant reliability degradation?
Operating continuously near 150°C TJ increases long-term failure rates due to accelerated electromigration and bond wire degradation. Although the datasheet specifies -65°C to 150°C operation, practical design margins suggest limiting sustained use above 125°C. Thermal simulations or worst-case power dissipation calculations should confirm that self-heating remains within acceptable bounds, especially in sealed or poorly ventilated enclosures where ambient temperature exceeds 85°C.
How does the reverse leakage current specification affect low-power analog circuits using the BZX84C20-7-F-79?
At 14V reverse bias, the BZX84C20-7-F-79 exhibits 100 nA of leakage, which may be negligible in digital circuits but could accumulate error in precision measurement stages. In battery-powered devices or high-impedance sensor interfaces, this current contributes to baseline drift over time. Designers should evaluate whether parallel shunt paths or lower-voltage Zeners offer better trade-offs in leakage versus cost and footprint.
Is it acceptable to substitute the BZX84C20-7-F-79 with the BZX84B20Q-7-F in high-reliability automotive applications?
Substitution requires verification of all electrical and environmental parameters. While both share nominal 20V breakdown and SOT-23 packaging, the BZX84B20Q-7-F has tighter tolerance (±2%) but higher Zzt (typically >100Ω), making it less suitable for low-current regulation. Automotive qualification adds further constraints—only parts meeting AEC-Q101 are valid for such use cases. Without confirmation of certification status, direct substitution risks non-compliance.
What role does moisture sensitivity level play in storage and handling of the BZX84C20-7-F-79?
Classified as MSL 1, the BZX84C20-7-F-79 is exempt from standard humidity pre-conditioning requirements and can remain unprotected during normal handling. However, prolonged exposure to high humidity (>85% RH) may promote electrochemical migration on exposed pads during reflow soldering. Manufacturers recommend storing components in dry cabinets if lead-free processes are employed, though immediate use after removal from sealed packaging minimizes risk.
How does the forward voltage drop of the BZX84C20-7-F-79 compare to Schottky diodes in clamping applications?
The BZX84C20-7-F-79 has a maximum forward voltage of 900mV at 10mA, which is comparable to many Schottky diodes. However, unlike dedicated clamping diodes, this Zener’s forward characteristic is less predictable under fast transients due to carrier recombination dynamics. In bidirectional clamping networks, pairing it with a Schottky may yield better overall response, though added component count increases board space and BOM complexity.
What design implications arise from using the BZX84C20-7-F-79 in series with a resistor for current-limited protection?
Adding a series resistor limits peak current during overvoltage events, protecting the diode while leveraging its 300mW rating. For example, at 25V input, a 50Ω resistor limits surge current to ~100mA, keeping power below 2.5W momentarily. However, continuous operation above 300mW requires active cooling or reduced duty cycle. Resistor selection must balance efficiency loss against robustness, particularly in industrial environments subject to voltage spikes.
Why might the BZX84C20-7-F-79 exhibit inconsistent performance in rapid thermal cycling tests?
Thermal cycling induces mechanical stress at the die attach interface due to coefficient mismatch between silicon and mold compound. Repeated expansion/contraction cycles can delaminate bonds, leading to intermittent open or short failures. Although rated for -65°C to 150°C, cumulative fatigue over thousands of cycles may cause parametric shifts in Vz or increased leakage. Mitigation strategies include using underfill materials or selecting packages with enhanced reliability profiles.
How do regulatory declarations (RoHS, REACH, ECCN) affect global distribution of the BZX84C20-7-F-79?
RoHS3 compliance ensures halogen-free construction and restricted substance thresholds, essential for EU market access. REACH unaffected status confirms no SVHCs above 0.1% w/w, reducing registration burdens. ECCN EAR99 classification means U.S. export controls apply minimally, facilitating international sourcing. These attributes simplify compliance documentation but do not guarantee local homologation; importers must verify jurisdiction-specific certifications independently.
What is the significance of the base product number BZX84 in variant selection?
The BZX84 prefix denotes a family of precision Zener diodes optimized for general-purpose regulation. Variants differ primarily in tolerance (B = ±2%, C = ±6%), packaging (7-F = Digi-Key code, Q = Vishay-compatible marking), and tape format. Choosing BZX84C20-7-F-79 implies acceptance of ±6% accuracy and standard industrial packaging, trading precision for cost and availability benefits over tighter-tolerance options.

Parts with Similar Specifications

The three parts on the right have similar specifications to Diodes Incorporated BZX84C20-7-F-79

Product Attribute BZX84C20-13-F-79 BZX84C20-7-F BZX84C20-7-G BZX84C20-HE3-08
Part Number BZX84C20-13-F-79 BZX84C20-7-F BZX84C20-7-G BZX84C20-HE3-08
Manufacturer Diodes Incorporated Diodes Incorporated Diodes Incorporated Vishay General Semiconductor - Diodes Division
Tolerance - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Power - Max - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Impedance (Max) (Zzt) - - - -
Series - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Zener (Nom) (Vz) - - - -
Voltage - Forward (Vf) (Max) @ If - - - -
Current - Reverse Leakage @ Vr - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Mounting Type - Surface Mount Through Hole Surface Mount
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

BZX84C20-7-F-79 Datasheet PDF

Download BZX84C20-7-F-79 pdf datasheets and Diodes Incorporated documentation for BZX84C20-7-F-79 - Diodes Incorporated.

PCN Obsolescence/ EOL
Mult Dev EOL 28/May/2020.pdf
Environmental Information
Diodes Environmental Compliance Cert.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Circ***FixerTom
    Sep 2, 2026

    Used this rectifier in a high-current power supply repair. Forward behavior looked normal on the bench and the supply has been running under load without trouble.

  • Retr***UWorks
    Aug 31, 2026

    Needed the exact ST10F269Z2Q6 for servicing an older control unit. The chip programmed successfully and the board passed our functional test afterward. Much easier than redesigning around a newer MCU.

  • Andr***PCBLab
    Aug 28, 2026

    I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.

  • Leat***O'Keefe
    Aug 20, 2026

    one of my hobbies is skydiving. and when i'm skydiving this works great.

  • Ilen***
    Aug 20, 2026

    This product works considerably well. It secretly improves my basketball by a lot.

  • Indu***ialPower
    Aug 17, 2026

    Installed this IGBT module in a power conversion cabinet. Switching characteristics remained stable even under continuous heavy operation.

  • Nikh***ech
    Aug 13, 2026

    Great low-power MCU for portable equipment. Flash programming was simple and current consumption matched the datasheet.

  • Embe***dMotion
    Aug 5, 2026

    Purchased this DSP controller for a motor control application. Stable processing performance and very good response under varying loads.

  • FPGA***dio
    Jul 30, 2026

    This FPGA handled our logic design without any surprises. Configuration completed quickly and timing met the project requirements.

  • Nord***mbedded
    Jul 20, 2026

    Reliable FPGA with predictable behavior. Configuration and testing went smoothly, making development faster than expected.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
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  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
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We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
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Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
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  • ISO 14001: 2015
  • ISO 28000: 2007
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  • GB/T 27922-2011
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  • IPC
  • ESD
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BZX84C20-7-F-79 Image

BZX84C20-7-F-79

Diodes Incorporated
98D-BZX84C20-7-F-79

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