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Diodes Incorporated BZX84B20-7-F
- Part No.:
- BZX84B20-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B20-7-F.pdf
- Description:
- DIODE ZENER 20V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:99,181
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Product details
Overview
BZX84B20-7-F from Diodes Incorporated is a precision 20 V ±2% tolerance Zener diode in SOT23 package, rated for 350 mW power dissipation at ambient temperature, with 55 Ω dynamic impedance at 5 mA test current and 0.1 µA maximum reverse leakage at 14 V, widely used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84B20-7-F datasheet, BZX84B20-7-F pinout, BZX84B20-7-F application, or BZX84B20-7-F equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (357 °C/W), junction-to-ambient derating behavior, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations, with nominal Zener voltage of 20 V at 5 mA test current and temperature coefficient of +14.4 mV/°C - indicating positive drift above 25 °C. Its 350 mW power rating applies under specified mounting conditions on FR-4 PCB with recommended pad layout.
The device exhibits 55 Ω Zener impedance at IZT = 5 mA and 225 Ω at knee current IZK = 1.0 mA, confirming tight regulation performance near nominal operating point. Reverse leakage remains ≤0.1 µA up to 14 V, supporting low-current biasing and high-impedance reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V nominal, 19.6–20.4 V range at 5 mA - ensures ±2% regulation accuracy for precision references. |
| Power Dissipation (PD) | 350 mW at TA = 25 °C with terminals held at ambient - defines maximum continuous steady-state power handling. |
| Zener Impedance (ZZT) | 55 Ω at IZT = 5 mA - indicates low AC impedance for stable voltage under small-signal ripple conditions. |
| Reverse Leakage (IR) | ≤0.1 µA at VR = 14 V - enables use in ultra-low-power bias networks without loading error. |
| Thermal Resistance (RθJA) | 357 °C/W - determines junction temperature rise per milliwatt under free-air conditions with ambient-terminated leads. |
| Temperature Coefficient | +14.4 mV/°C - quantifies voltage drift magnitude and sign over operating temperature range. |
| AEC-Q101 Qualified | Yes - confirms suitability for automotive electronics requiring high-reliability stress testing and qualification. |
Pinout & Package
Package: SOT23 - surface-mount plastic case with matte tin-plated Alloy 42 leadframe, UL 94V-0 flammability rating, moisture sensitivity level 1, weight ≈0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode-side connection in reverse-bias configuration | Connected to lower-potential node when used as shunt regulator; polarity must match schematic symbol orientation. |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Connected to higher-potential node; voltage referenced to anode; carries full Zener current during regulation. |
| NC / Heat Sink (Pin 3) | Non-connected / thermal relief pad | No internal connection; serves as mechanical anchor and minor thermal path; not electrically functional. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct replacement in precision reference designs without recalibration or trimming. |
| AEC-Q101 qualification | Validates robustness for automotive body control modules, sensor interfaces, and infotainment power rails. |
| SOT23 package with lead-free plating | Supports automated pick-and-place assembly and RoHS-compliant reflow soldering processes. |
| Low 0.1 µA reverse leakage at 14 V | Minimizes quiescent current draw in battery-powered voltage monitor circuits. |
| 350 mW power rating with defined derating curve | Allows predictable thermal design up to +125 °C ambient using published RθJA and derating data. |
Applications
| Automotive Sensor Reference | Industrial Analog Front-End |
|---|---|
Use Scenario: Providing stable 20 V reference for pressure transducer signal conditioning in engine control units. IC Role / Device Role / Timing Role: Shunt voltage reference for op-amp biasing and ADC reference scaling. Use Value: ±2% tolerance and AEC-Q101 qualification ensure consistent sensor output accuracy across temperature and lifetime. |
Use Scenario: Regulating supply to instrumentation amplifier in programmable logic controller analog input modules. IC Role / Device Role / Timing Role: Low-power Zener clamp protecting downstream circuitry from overvoltage transients. Use Value: 0.1 µA leakage and 55 Ω impedance maintain signal integrity while minimizing standby power loss. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Bias |
Use Scenario: Setting feedback threshold in isolated flyback converter secondary-side regulation loop. IC Role / Device Role / Timing Role: Precision voltage reference for optocoupler-driven feedback path. Use Value: Tight 19.6–20.4 V range ensures accurate output voltage setpoint within ±1% system tolerance. |
Use Scenario: Generating stable bias for photodiode transimpedance amplifier in portable blood oximeter. IC Role / Device Role / Timing Role: Low-noise DC reference source for analog signal chain calibration. Use Value: +14.4 mV/°C TC and 357 °C/W RθJA allow predictable compensation in temperature-critical diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ4684T1G | 20 V nominal, ±5% tolerance, 500 mW PD, 100 Ω ZZT at 5 mA, no AEC-Q101 qualification | Higher power but looser tolerance and unqualified for automotive use | Select when cost-sensitive industrial applications tolerate wider voltage variation and lack automotive requirements. |
| BZX84-C20 | 20 V nominal, ±5% tolerance, 350 mW PD, 55 Ω ZZT, AEC-Q101 qualified, but uses older "C" series process with higher leakage (≤0.5 µA) | Same package and power rating but higher reverse leakage impacts ultra-low-power designs | Prefer when legacy BOM compatibility is required and leakage <0.1 µA is not critical. |
Compared with MMSZ4684T1G and BZX84-C20, BZX84B20-7-F delivers tighter ±2% voltage control and lowest leakage (0.1 µA), making it optimal for precision analog references where stability and low quiescent current are prioritized over raw power headroom.
Availability
BZX84B20-7-F is available at Aetrix Electronics and suitable for automotive sensor reference, industrial analog front-end, and consumer power adapter feedback requiring stable component supply with AEC-Q101 compliance and traceable green sourcing.
Supply support for BZX84B20-7-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 consumer markets with emphasis on efficiency, miniaturization, and regulatory compliance.
The BZX84B series belongs to Diodes' precision Zener diode product line, engineered specifically for stable voltage reference and regulation in space-constrained, thermally demanding applications requiring tight tolerance and automotive qualification.
FAQ
What is the maximum reverse voltage before breakdown for BZX84B20-7-F?
The BZX84B20-7-F has a nominal Zener voltage of 20 V at 5 mA test current, with guaranteed breakdown occurring between 19.6 V and 20.4 V. It does not specify a distinct "maximum reverse voltage" prior to breakdown - operation below 19.6 V places it in non-conductive reverse-biased region with ≤0.1 µA leakage up to 14 V.
Can BZX84B20-7-F be used in place of a 20 V Zener with ±5% tolerance?
Yes, but only if the application requires tighter regulation: BZX84B20-7-F's ±2% tolerance (19.6–20.4 V) improves voltage accuracy by 3% absolute over ±5% parts (19.0–21.0 V). This reduces calibration burden in precision references but may require verifying that downstream circuitry tolerates the narrower voltage window.
Is the SOT23 package of BZX84B20-7-F compatible with standard reflow profiles?
Yes - the device uses matte tin-plated Alloy 42 leads and green molding compound compliant with J-STD-020 Level 1 moisture sensitivity, supporting standard Pb-free reflow profiles (peak 260 °C, 10–30 sec dwell) without preconditioning. Recommended pad layout is documented in Diodes' SOT23 package outline.
Does BZX84B20-7-F support bidirectional ESD protection?
No - it is a unidirectional Zener diode optimized for reverse-bias voltage regulation, not transient suppression. Its 350 mW rating and 225 Ω knee impedance are unsuited for ESD pulse absorption. For bidirectional protection, dedicated TVS diodes like D3V3M1U2LP should be used instead.
BZX84B20-7-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:
- ±2%
- 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
BZX84B20-7-F FAQ
1.How can I place an order for BZX84B20-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B20-7-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 BZX84B20-7-F reliable?
The price and inventory of BZX84B20-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B20-7-F is usually 5 days.
3.What payment methods are accepted for BZX84B20-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B20-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B20-7-F?
BZX84B20-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B20-7-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 BZX84B20-7-F?
For technical support, including BZX84B20-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B20-7-F requirements.
6.How does Aetrix verify that BZX84B20-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84B20-7-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 BZX84B20-7-F meets industry standards.
7.What is the process for return or replacement of BZX84B20-7-F?
All BZX84B20-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B20-7-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 BZX84B20-7-F part is unused and in its original packaging.
Return procedure for BZX84B20-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B20-7-F Tags
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