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Nexperia USA Inc. BZX84W-B20-QF
- Part No.:
- BZX84W-B20-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B20-QF.pdf
- Description:
- DIODE ZENER 20V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:3,518
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Product details
Overview
BZX84W-B20-QF from Nexperia is a ±2% tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 20 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It provides precise voltage reference and overvoltage protection in compact power management circuits.
For engineers reviewing the BZX84W-B20-QF datasheet, BZX84W-B20-QF pinout, BZX84W-B20-QF application, or BZX84W-B20-QF equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (455 K/W), differential resistance (225 Ω at 5 mA), reverse leakage current (50 nA at 14 V), and automotive qualification status.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across load variations by conducting reverse current above its specified Zener breakdown threshold. Its 20 V nominal Zener voltage is defined at IZ = 5 mA with ±2% tolerance, and exhibits a positive temperature coefficient of +16.4 mV/K at that bias point.
The SOT323 package enables high-density PCB layouts while supporting reflow and wave soldering per JEDEC standards. With a non-repetitive peak reverse power dissipation of 40 W (100 µs pulse), it handles transient overvoltage events without degradation when properly heatsinked on FR4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.6 V to 20.4 V at IZ = 5 mA - ensures tight regulation within ±2% for precision reference applications |
| Differential Resistance (rdiff) | 225 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Leakage Current (IR) | 50 nA max at VR = 14 V - guarantees low standby power loss in always-on circuits |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - defines continuous DC power handling under standard mounting |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in extended automotive ambient conditions |
| Thermal Resistance (Rth(j-a)) | 455 K/W - quantifies self-heating rise per watt dissipated in free-air FR4 layout |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - limits conduction loss during forward-biased fault conditions |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; dimensions: 2.2 mm × 1.35 mm × 0.95 mm (L × W × H); 100% matte tin termination; RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder joint permitted |
| 3 | Cathode (K) | Zener breakdown terminal; connects to higher-potential node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock testing |
| ±2% Zener voltage tolerance | Enables tighter system-level voltage margin control versus ±5% variants, reducing need for post-regulation trimming |
| Low differential resistance (225 Ω) | Minimizes output voltage shift under varying load currents, improving regulation accuracy |
| High-temperature operation (150 °C Tj) | Supports under-hood and powertrain applications where ambient exceeds 125 °C |
| Low reverse leakage (50 nA @ 14 V) | Reduces quiescent current in battery-powered systems and improves standby efficiency |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for microcontroller ADC inputs monitoring 12 V battery rail. IC Role / Device Role / Timing Role: Shunt Zener regulator providing stable 20 V reference for analog front-end scaling. Use Value: Maintains <±0.4 V error across −40 °C to +125 °C ambient, meeting ASIL-B functional safety requirements. |
Use Scenario: Overvoltage clamp protecting 24 V industrial I/O circuitry from ESD and surge transients. IC Role / Device Role / Timing Role: Fast-response shunt protector absorbing up to 40 W non-repetitive pulses without failure. Use Value: Limits transient voltage to ≤22 V for <100 µs, preventing damage to downstream op-amps and isolators. |
| Consumer Power Adapter Feedback Loop | Medical Portable Device Battery Monitor |
Use Scenario: Secondary-side voltage sensing in isolated flyback converter feedback network. IC Role / Device Role / Timing Role: Precision Zener element setting optocoupler LED current threshold for regulation. Use Value: Enables ±1.5% output voltage stability over line/load/temperature with minimal component count. |
Use Scenario: Reference source for lithium-ion cell voltage measurement in wearable health monitors. IC Role / Device Role / Timing Role: Low-leakage (<50 nA) voltage reference enabling accurate 16-bit ADC conversion. Use Value: Reduces measurement drift to <0.02% FS over 10-year shelf life due to ultra-low IR-induced offset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C20-Q | ±5% Zener tolerance (18.8–21.2 V), higher max differential resistance (250 Ω) | Acceptable where system-level calibration compensates for wider voltage spread | Select for cost-sensitive consumer designs where ±5% regulation suffices |
| MMSZ5248B-TP | Same 20 V nominal, ±5% tolerance, SOD-123 package, 500 mW Ptot, 350 K/W Rth(j-a) | Higher power rating but larger footprint; not AEC-Q101 qualified | Choose only for non-automotive industrial use requiring >275 mW continuous dissipation |
Compared with BZX84W-B20-QF, the BZX84W-C20-Q trades tighter voltage control for lower unit cost, while MMSZ5248B-TP offers higher power handling in a less space-constrained package but lacks automotive qualification and has inferior thermal performance on FR4.
Availability
BZX84W-B20-QF is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and portable medical devices requiring stable component supply with AEC-Q101 compliance and tight Zener voltage tolerance.
Supply support for BZX84W-B20-QF 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX84W-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for robust voltage regulation and transient suppression in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current this Zener can handle at 25 °C?
The BZX84W-B20-QF supports a maximum continuous reverse current of 13.75 mA at 25 °C ambient, calculated from its 275 mW power rating divided by the nominal 20 V Zener voltage. This assumes no additional thermal derating and standard FR4 mounting per datasheet conditions.
Is Pin 2 electrically connected internally?
No - Pin 2 is explicitly designated "n.c." (not connected) in the official Nexperia datasheet and internal construction. It must remain unconnected on the PCB; soldering or routing to this pad will cause mechanical stress and potential package cracking during thermal cycling.
How does the +16.4 mV/K temperature coefficient affect long-term voltage stability?
The +16.4 mV/K coefficient means the Zener voltage increases by approximately 16.4 mV per Kelvin rise in junction temperature. At 100 °C junction temperature (75 K above 25 °C), VZ rises by ~1.23 V - a predictable, linear shift used in temperature-compensated reference designs, not a stability flaw.
Can this diode be used in parallel for higher current capability?
No - Zener diodes exhibit manufacturing variance in VZ and rdiff, causing current hogging if paralleled without individual ballast resistors. The datasheet does not specify matched pairs, and AEC-Q101 qualification applies only to single-device operation per recommended layout.
BZX84W-B20-QF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W-Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 55 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B20-QF FAQ
1.How can I place an order for BZX84W-B20-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B20-QF 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 BZX84W-B20-QF reliable?
The price and inventory of BZX84W-B20-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B20-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B20-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B20-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B20-QF?
BZX84W-B20-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B20-QF 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 BZX84W-B20-QF?
For technical support, including BZX84W-B20-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B20-QF requirements.
6.How does Aetrix verify that BZX84W-B20-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B20-QF 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 BZX84W-B20-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B20-QF?
All BZX84W-B20-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B20-QF, 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 BZX84W-B20-QF part is unused and in its original packaging.
Return procedure for BZX84W-B20-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B20-QF Tags
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MM5Z5V1ST1G
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