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Diodes Incorporated BZX84C20-7-F
- Part No.:
- BZX84C20-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C20-7-F.pdf
- Description:
- DIODE ZENER 20V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:27,439
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Product details
Overview
BZX84C20-7-F from Diodes Incorporated is a 350mW surface-mount Zener diode with a nominal zener voltage of 20V (18.8–21.2V range at 5mA test current), 55Ω maximum zener impedance at 5mA, and ±0.1µA maximum reverse leakage at 14V. It uses planar die construction in an SOT23 package and is qualified to AEC-Q101 for automotive-grade reliability. It serves as a precision voltage reference or overvoltage clamp in low-power power supply regulation circuits.
For engineers reviewing the BZX84C20-7-F datasheet, BZX84C20-7-F pinout, BZX84C20-7-F application, or BZX84C20-7-F equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at rated test current, thermal resistance (357°C/W), RoHS/Green compliance status, and SOT23 terminal configuration for PCB layout and automated assembly compatibility.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or input conditions. Its 20V nominal zener voltage is specified at 5mA test current (IZT), with a temperature coefficient of +0.4mV/°C - indicating slight positive drift with rising junction temperature.
The device exhibits 55Ω dynamic impedance (ZZT) at IZT = 5mA and 225Ω knee impedance (ZZK) at IZK = 1.0mA, confirming sharp breakdown characteristics suitable for voltage regulation in space-constrained, low-current applications up to 350mW dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20V nominal (18.8–21.2V range at 5mA); defines stable clamping/reference point in regulation circuits |
| Power Dissipation (PD) | 350mW at ambient temperature; sets max continuous power handling without heatsinking |
| Zener Impedance (ZZT) | 55Ω max at 5mA; determines output voltage stability under small-signal load variations |
| Reverse Leakage (IR) | 0.1µA max at 14V; ensures minimal quiescent current in standby or high-impedance bias networks |
| Thermal Resistance (RθJA) | 357°C/W (free-air); defines junction-to-ambient temperature rise per watt dissipated |
| Package | SOT23; 3-terminal surface-mount outline compatible with standard pick-and-place and reflow processes |
| Compliance | RoHS 3, Halogen- and Antimony-free ("Green"), AEC-Q101 qualified; meets automotive and industrial environmental requirements |
Pinout & Package
Package: SOT23 - compact 3-pin surface-mount plastic case with matte tin-plated alloy 42 leadframe; polarity indicated by cathode band on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower potential side in reverse-bias operation; forms return path for zener current |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher potential side; voltage referenced to this node during regulation/clamping |
| No-Connect / Heat Sink (Pin 3) | Internal die attach pad | Electrically isolated but thermally coupled to junction; improves heat dissipation when soldered to copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight zener voltage tolerance and repeatable breakdown characteristics across production lots |
| AEC-Q101 qualification | Validates reliability for automotive electronics including engine control, body modules, and infotainment power rails |
| 350mW power rating | Supports regulation in low-power sensor interfaces, microcontroller reset circuits, and analog front-end biasing |
| SOT23 footprint | Minimizes PCB area while enabling high-density placement and compatibility with automated SMT assembly lines |
| Lead-free & Green compliant | Meets global environmental regulations without compromising electrical performance or thermal behavior |
Applications
| Microcontroller Reset Circuit | ADC Reference Clamp |
|---|---|
Use Scenario: Provides clean, stable reset threshold for 3.3V or 5V microcontrollers during power-up or brown-out events. IC Role / Device Role: Zener diode acts as precision voltage threshold detector in conjunction with RC timing network. Use Value: Ensures reliable reset assertion at exactly 20V-derived threshold, preventing premature release or latch-up due to supply ripple. |
Use Scenario: Limits input voltage to ADC reference pin to prevent damage from transient overvoltage. IC Role / Device Role: Acts as shunt overvoltage protector upstream of precision voltage reference IC. Use Value: Clamps excursions above 21.2V with <0.1µA leakage below 14V, preserving reference accuracy and long-term stability. |
| Low-Power Sensor Biasing | Automotive LED String Protection |
Use Scenario: Supplies regulated bias voltage to analog sensor signal conditioning circuitry in battery-powered IoT nodes. IC Role / Device Role: Functions as passive voltage regulator in ultra-low-quiescent-current designs. Use Value: Delivers 20V reference with only 55Ω dynamic impedance, minimizing error contribution to sensor gain calibration. |
Use Scenario: Protects 12V automotive LED lighting modules from load-dump transients exceeding 24V. IC Role / Device Role: Shunt clamp absorbing surge energy during alternator disconnection events. Use Value: Withstands 350mW peak dissipation and maintains clamping within 18.8–21.2V window, preventing LED driver IC failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F | 20V nominal, 350mW, SOT23, but 23Ω max ZZT at 20mA (vs. 55Ω at 5mA); tighter VZ tolerance (±5% vs. ±6%) | Higher test current shifts optimal operating point; better suited for higher-current regulation where lower impedance matters | Select when lower dynamic impedance at >5mA is required; verify thermal margin at elevated IZ |
| BZX84-C20,115 | Same 20V spec, SOT23, but non-AEC-Q101, halogen-free only (not Antimony-free), 300mW PD (Note 6 derating) | Lacks automotive qualification and full Green compliance; intended for commercial-grade consumer applications | Choose for cost-sensitive non-automotive designs where AEC-Q101 and full RoHS 3 compliance are not mandated |
Compared with MMBZ5242B-7-F and BZX84-C20,115, the BZX84C20-7-F offers balanced trade-offs: AEC-Q101 reliability, full Green compliance, and optimized 5mA test-point impedance - making it ideal for automotive and industrial applications requiring assured long-term stability and regulatory alignment.
Availability
BZX84C20-7-F is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface design, and embedded system reset circuitry requiring stable component supply and full environmental compliance.
Supply support for BZX84C20-7-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, specializing in high-reliability components for automotive, industrial, and computing markets.
The BZX84 series belongs to Diodes' precision Zener diode product line, engineered for stable voltage reference and overvoltage protection in space-constrained, high-volume surface-mount applications.
FAQ
What is the maximum reverse voltage the BZX84C20-7-F can safely clamp?
The BZX84C20-7-F is rated for a nominal zener voltage of 20V with a guaranteed range of 18.8V to 21.2V at 5mA. Its absolute maximum reverse voltage before catastrophic failure is not specified, but sustained operation above 21.2V increases power dissipation beyond safe limits. For transient suppression, it must be used with current-limiting resistors to ensure power remains ≤350mW.
Does the BZX84C20-7-F require a heatsink in typical applications?
No heatsink is required for the BZX84C20-7-F in standard operation. With a thermal resistance of 357°C/W and a 350mW power rating, junction temperature rise remains within safe limits (<125°C) at room ambient when dissipating ≤100mW continuously. Heatsinking becomes necessary only in high-ambient environments (>85°C) or during pulsed overload conditions exceeding 350mW.
How does the temperature coefficient affect regulation accuracy?
The BZX84C20-7-F has a temperature coefficient of +0.4mV/°C, meaning its zener voltage increases by 0.4mV per degree Celsius rise in junction temperature. Over a –40°C to +125°C operating range, this introduces up to ±66mV drift from nominal 20V - a ±0.33% variation. For high-precision references, this drift must be compensated via circuit design or by selecting tighter-tolerance variants.
Can the BZX84C20-7-F replace older BZX84C20 variants in existing designs?
Yes, the BZX84C20-7-F is a direct replacement for legacy BZX84C20 parts in SOT23 packages, provided the design accounts for its AEC-Q101 qualification, full Green compliance, and updated thermal resistance (357°C/W vs. older 417°C/W). No layout or schematic changes are needed, but verify that the 5mA test current aligns with existing bias resistor values.
BZX84C20-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±6%
- Power - Max:
- 300 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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C20-7-F FAQ
1.How can I place an order for BZX84C20-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C20-7-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 BZX84C20-7-F reliable?
The price and inventory of BZX84C20-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C20-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C20-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C20-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C20-7-F?
BZX84C20-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C20-7-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 BZX84C20-7-F?
For technical support, including BZX84C20-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C20-7-F requirements.
6.How does Aetrix verify that BZX84C20-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C20-7-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 BZX84C20-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C20-7-F?
All BZX84C20-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C20-7-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 BZX84C20-7-F part is unused and in its original packaging.
Return procedure for BZX84C20-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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