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Diodes Incorporated BZX84C20-7
- Part No.:
- BZX84C20-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C20-7.pdf
- Description:
- DIODE ZENER 20V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,383
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Product details
Overview
BZX84C20-7 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 −3.5mV/°C temperature coefficient. It operates from −65°C to +150°C and is housed in an SOT23 package, commonly used for voltage regulation and reference in power supply feedback loops.
For engineers reviewing the BZX84C20-7 datasheet, BZX84C20-7 pinout, BZX84C20-7 application, or BZX84C20-7 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (357°C/W), reverse leakage (<0.1µA at 14V), power derating above 25°C, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode employs planar die construction for stable breakdown characteristics and low dynamic impedance. Its 20V nominal zener voltage is specified at 5mA test current, with a tight ±5% tolerance band (18.8–21.2V) and low temperature drift (−3.5mV/°C), enabling precision voltage referencing in analog circuits.
The device delivers 350mW power dissipation under ambient-temperature terminal conditions and features a thermal resistance of 357°C/W (junction-to-ambient), supporting operation up to +150°C with appropriate PCB layout. Reverse leakage remains below 0.1µA at 14V, ensuring minimal quiescent current in bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20V nominal (18.8–21.2V range at IZT = 5mA); defines stable regulation point for feedback or reference use |
| Power Dissipation (PD) | 350mW at TA = 25°C with terminals held at ambient; limits continuous power handling in compact layouts |
| Zener Impedance (ZZT) | 55Ω max at 5mA; ensures low AC impedance for stable regulation under varying load conditions |
| Temperature Coefficient | −3.5mV/°C; enables predictable voltage drift compensation in temperature-sensitive references |
| Reverse Leakage (IR) | <0.1µA at VR = 14V; minimizes error current in high-impedance bias networks |
| Thermal Resistance (RθJA) | 357°C/W; determines junction temperature rise per watt under standard mounting conditions |
| Operating Temperature | −65°C to +150°C; supports industrial and automotive under-hood applications |
Pinout & Package
Package: SOT23 - surface-mount plastic case with matte tin-plated alloy 42 leadframe; UL 94V-0 rated; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction path / cathode reference return | Connected to circuit ground or lower potential node in reverse-biased regulation configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated voltage node; reverse-biased to maintain stable 20V reference |
| NC / Heat Sink (Pin 3) | Non-connected / thermal relief pad | No internal connection; serves as mechanical anchor and minor thermal path via PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable breakdown voltage and low parameter drift across production lots |
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900ppm Br, <900ppm Cl, <1000ppm Sb compounds |
| SOT23 footprint compatibility | Enables automated pick-and-place assembly and reflow soldering without custom tooling |
Applications
| Switch-Mode Power Supply Feedback | Automotive ECU Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Provides precise 20V reference for TL431-like comparator input or direct feedback to PWM controller. Use Value: Tight 5% voltage tolerance and low tempco ensure ±1% output stability over −40°C to +125°C ambient. |
Use Scenario: Supplies stable reference for sensor signal conditioning in engine control modules. IC Role / Device Role / Timing Role: Biasing reference for analog front-end amplifiers measuring throttle position or coolant temperature. Use Value: AEC-Q101 qualification and 150°C max operating temperature support under-hood deployment. |
| Industrial Sensor Excitation | Overvoltage Clamp Protection |
Use Scenario: Generates fixed excitation voltage for resistive bridge sensors (e.g., pressure transducers). IC Role / Device Role / Timing Role: Acts as two-terminal shunt regulator to deliver stable 20V bias independent of supply ripple. Use Value: Low 55Ω zener impedance suppresses noise coupling into sensitive measurement paths. |
Use Scenario: Limits transient voltage on 15V logic rails during ESD or load-dump events. IC Role / Device Role / Timing Role: Shunt clamp activated above 21.2V to divert surge current away from downstream ICs. Use Value: Fast response (ns-scale) and 350mW rating absorb short-duration transients without failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5242B-7-F | 20V nominal, 225mW PD, 30Ω ZZT, −3.5mV/°C, SOT23 | Lower power rating reduces thermal margin in sustained overload; tighter ZZT improves regulation accuracy | Select when higher regulation precision outweighs power headroom needs |
| BZX84-C20,115 | 20V nominal, 350mW PD, 55Ω ZZT, −3.5mV/°C, SOT23, Nexperia | Identical electrical specs; differs in halogen-free status (Nexperia "Green" vs Diodes "Green" compliance) | Choose based on supply chain preference or specific RoHS/halogen documentation requirements |
Compared with MMBZ5242B-7-F, BZX84C20-7 offers 56% higher power handling for robustness in intermittent overloads; versus BZX84-C20,115, it provides identical regulation performance but with Diodes Incorporated's AEC-Q101 validation and traceable date-code marking.
Availability
BZX84C20-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, automotive electronic control units, and industrial sensor interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84C20-7 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, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The BZX84 series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation and reference in consumer, industrial, and automotive systems.
FAQ
What is the maximum reverse voltage before breakdown for BZX84C20-7?
The BZX84C20-7 exhibits sharp reverse breakdown at its nominal zener voltage of 20V, with a guaranteed range of 18.8V to 21.2V at 5mA test current. Below 14V, reverse leakage remains under 0.1µA; no distinct "maximum non-breakdown" voltage is specified - operation above 21.2V initiates controlled conduction.
Is BZX84C20-7 suitable for automotive applications?
Yes - BZX84C20-7 is qualified to AEC-Q101 standards, tested for high-temperature operation up to +150°C, and manufactured with green molding compound meeting halogen- and antimony-free requirements. Its SOT23 package and robust parametric stability make it approved for engine control, body electronics, and infotainment subsystems.
How does thermal derating affect BZX84C20-7's power handling?
At ambient temperatures above +25°C, BZX84C20-7's power dissipation must be linearly reduced: from 350mW at 25°C to zero at approximately +150°C, following a slope of −3.5mW/°C. This derating is defined by its 357°C/W thermal resistance and requires adequate PCB copper area for heat spreading in high-temperature environments.
Can BZX84C20-7 replace older BZX84C20 variants with different suffixes?
Yes - the "-7" suffix denotes 3,000-piece tape-and-reel packaging in standard (non-automotive) grade. Electrically identical to BZX84C20-13-F (10k/reel) and BZX84C20Q-7-F (automotive), differences are limited to packaging format and qualification level; pinout, electrical specs, and SOT23 footprint remain fully compatible.
BZX84C20-7 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:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for BZX84C20-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C20-7 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 reliable?
The price and inventory of BZX84C20-7 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 is usually 5 days.
3.What payment methods are accepted for BZX84C20-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C20-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C20-7?
BZX84C20-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C20-7 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?
For technical support, including BZX84C20-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C20-7 requirements.
6.How does Aetrix verify that BZX84C20-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C20-7 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 meets industry standards.
7.What is the process for return or replacement of BZX84C20-7?
All BZX84C20-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C20-7, 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 part is unused and in its original packaging.
Return procedure for BZX84C20-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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