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

Manufacturer Part Number
BZX84C20-7
Manufacturer
Diodes Incorporated
Allelco Part Number
32D-BZX84C20-7
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
3,800 pcs available, New & Original
Parts Description
DIODE ZENER 20V 300MW SOT23-3
Package
SOT-23-3
Data sheet
BZX84C20-7.pdf

Environmental Information

Diodes Environmental Compliance Cert.pdf
RoHs Status
 
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In stock: 3800

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Specifications

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

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
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 RoHS non-compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99

Parts Introduction

BZX84C20-7 Image
BZX84C20-7 (1)

Manufacturer Part Number

BZX84C20-7

Manufacturer

Diodes Incorporated

Introduction

Zener diode

Designed for general-purpose voltage regulation and reference applications

Product Features and Performance

Zener voltage: 20V

Tolerance: ±6%

Maximum power: 300mW

Reverse leakage current: 100nA @ 14V

Forward voltage: 900mV @ 10mA

Impedance: 55Ω max

Operating temperature range: -65°C to 150°C

Product Advantages

Reliable voltage regulation

Compact surface mount package

Wide operating temperature range

Key Technical Parameters

Zener voltage: 20V

Tolerance: ±6%

Maximum power: 300mW

Reverse leakage current: 100nA @ 14V

Forward voltage: 900mV @ 10mA

Impedance: 55Ω max

Operating temperature range: -65°C to 150°C

Quality and Safety Features

RoHS non-compliant

Compatibility

TO-236-3, SC-59, SOT-23-3 package

Surface mount

Application Areas

General-purpose voltage regulation

Reference applications

Product Lifecycle

Mature product, no indication of discontinuation

Replacements and upgrades available

Several Key Reasons to Choose This Product

Reliable voltage regulation

Compact surface mount package

Wide operating temperature range

Mature and widely available product

Frequently Asked Questions(FAQ)

What are the key differences between the BZX84C20-7 and other common 20V Zener diodes like MMBZ5250B-TP when selecting a component for voltage regulation in a high-impedance load circuit?
The BZX84C20-7 offers a nominal Zener voltage of 20 V with ±6% tolerance and a maximum power dissipation of 300 mW, making it suitable for low-power applications. In contrast, the MMBZ5250B-TP provides a tighter voltage tolerance (±2%) and similar power handling, which can improve regulation accuracy under variable loads. However, the BZX84C20-7 has a slightly higher dynamic impedance (55 Ω) compared to some alternatives, which may result in marginally larger output ripple in precision circuits. For high-impedance loads, where current draw is minimal, the BZX84C20-7’s leakage current of 100 nA at 14 V is acceptable but should be evaluated against system noise thresholds.
How does the BZX84C20-7 perform under transient conditions, and what design considerations are necessary when using it in a 5V microcontroller protection circuit?
The BZX84C20-7 is rated for up to 300 mW of power, which limits its ability to absorb energy from fast transients. In a 5V microcontroller environment, this device would not typically be used directly for overvoltage protection due to its high Zener voltage. Instead, it might serve as a reference or clamp in a feedback loop. If applied across a 5V line, the excessive reverse voltage would likely damage both the Zener and downstream components. A lower-voltage Zener such as 3.3V or 5.1V is more appropriate for protecting 5V systems. The BZX84C20-7’s use here would require careful current-limiting resistance to prevent exceeding its power rating during abnormal conditions.
Can the BZX84C20-7 be reliably used in automotive-grade temperature ranges, and what limitations exist given its -65°C to 150°C operating range?
While the BZX84C20-7 supports a wide industrial temperature range from -65°C to 150°C, this does not equate to full automotive qualification. Automotive environments impose stricter reliability criteria beyond temperature extremes, including thermal cycling, humidity, and mechanical stress. The component lacks AEC-Q101 certification, which is standard for automotive applications. Therefore, although the BZX84C20-7 could survive brief exposure to automotive temperatures, long-term deployment in vehicles—especially under harsh conditions—is not recommended without additional environmental testing and qualification.
What is the significance of the BZX84C20-7’s 55 Ω impedance in a switching regulator feedback network, and how does it affect voltage regulation accuracy?
With a maximum Zener impedance (Zzt) of 55 Ω, the BZX84C20-7 exhibits moderate dynamic resistance when conducting in the breakdown region. In a feedback divider network, this impedance interacts with series resistances and parasitic elements, potentially introducing small deviations in regulated output voltage under load variations. For a 20 V Zener regulating a 3.3 V rail via a resistive divider, the BZX84C20-7’s behavior is irrelevant unless directly biased. However, if used in a precision reference path, the 55 Ω impedance could cause voltage droop under higher control currents, reducing regulation stability. Designers must ensure total current through the Zener remains within safe limits to avoid significant voltage error.
How does the BZX84C20-7 compare to surface-mount substitutes like SZBZX84C20LT1G in terms of lead time, availability, and long-term supply risk?
The SZBZX84C20LT1G is a pin-compatible alternative offered by some manufacturers with improved RoHS compliance, unlike the BZX84C20-7, which is non-compliant. This difference can impact procurement in regulated markets. The BZX84C20-7 may offer broader distributor stocking due to legacy use, while newer parts like SZBZX84C20LT1G might face longer lead times as they gain adoption. Supply chain risk varies by region and manufacturer; however, the BZX84C20-7’s RoHS non-compliance may limit future sourcing options in certain geographies. Evaluating total cost of ownership and regulatory constraints is essential when choosing between these devices.
What precautions should be taken when soldering the BZX84C20-7 in mass production, given its SOT-23-3 package and Moisture Sensitivity Level?
Although the BZX84C20-7 has an MSL rating of 1 (unlimited floor life), improper handling during storage or assembly can still introduce defects. The small SOT-23-3 footprint requires precise soldering profiles to avoid bridging or cold joints. Thermal mass is low, so peak reflow temperatures should stay below 260°C for no more than 10 seconds to prevent degradation of internal junctions. Even with MSL 1, operators should avoid prolonged exposure to high humidity before processing. Adherence to JEDEC standards and consistent rework procedures minimizes yield loss and ensures reliable interconnects in high-volume manufacturing.
Is it feasible to parallel multiple BZX84C20-7 units to increase current handling, and what are the practical challenges involved?
Parallel operation of BZX84C20-7 Zeners is theoretically possible but introduces matching issues due to inherent part-to-part variation in Vz and Izt. Without external balancing resistors, one device may conduct significantly more current than others, leading to uneven heating and potential thermal runaway. Given each BZX84C20-7 is limited to 300 mW, paralleling two would only support 600 mW total, which is inefficient compared to using a single higher-power Zener. Moreover, the ±6% voltage tolerance means even slight mismatches can shift current distribution unequally under dynamic conditions. This approach is generally discouraged unless tightly matched and current-limited, making discrete parallel configurations impractical for robust designs.
What role does the BZX84C20-7 play in ESD protection schemes, and why might it not be ideal for direct transient suppression?
The BZX84C20-7 is not designed for primary ESD protection due to its relatively slow response and limited energy absorption capability. Its primary function is voltage regulation or clamping in steady-state or low-energy scenarios. During an electrostatic discharge event, which delivers nanosecond-scale pulses with high peak power, the BZX84C20-7 may fail before activating fully. Dedicated TVS diodes with faster rise times and higher surge ratings are better suited for such roles. The BZX84C20-7 could be used in conjunction with a TVS diode in a hybrid protection scheme, where it helps maintain a stable bias voltage after initial surge mitigation, but it should not bear the brunt of transient energy.

Parts with Similar Specifications

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

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

BZX84C20-7 Datasheet PDF

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

Datasheets
BZX84C2V4 - BZX84C51.pdf
Environmental Information
Diodes Environmental Compliance Cert.pdf

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Customer Reviews

Evaluation: 10 Articles

  • ECUb***h
    Sep 22, 2026

    Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.

  • RS48***ieldTech
    Sep 16, 2026

    Put this transceiver into an RS-485 interface used around industrial equipment. Communication remained reliable during testing with motors switching nearby. Good result for the replacement board.

  • Logi***b_Chris
    Sep 8, 2026

    Purchased for a Cyclone III development project. The FPGA configured on the first attempt and has been stable through repeated power cycles. No problems with the I/O we are using.

  • 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.

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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)
  • Payment Support
  • Packaging
  • 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.
  1. Visual inspection
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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
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
BZX84C20-7 Image

BZX84C20-7

Diodes Incorporated
32D-BZX84C20-7

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