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Nexperia USA Inc. BZX84W-B20-QX
- Part No.:
- BZX84W-B20-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B20-QX.pdf
- Description:
- DIODE ZENER 20V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,931
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Product details
Overview
BZX84W-B20-QX 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 stable voltage reference in low-power biasing, overvoltage protection, and signal conditioning circuits.
For engineers reviewing the BZX84W-B20-QX datasheet, BZX84W-B20-QX pinout, BZX84W-B20-QX application, or BZX84W-B20-QX equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (455 K/W), differential resistance (225 Ω at 5 mA), reverse leakage (50 nA at 14 V), and AEC-Q101 qualification status.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 20 V regulation voltage at IZ = 5 mA, exhibiting a temperature coefficient of +16.4 mV/K and differential resistance of 225 Ω under that condition. Its junction-to-ambient thermal resistance is 455 K/W on standard FR4 PCB mounting.
The device supports non-repetitive peak reverse power dissipation up to 40 W for 100 µs pulses and maintains ≤50 nA reverse current at VR = 0.7 × VZnom (14 V), ensuring low quiescent leakage in precision reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.6 V to 20.4 V at IZ = 5 mA - tight ±2% tolerance enables accurate voltage clamping in automotive sensor biasing |
| Differential Resistance (rdif) | 225 Ω max at IZ = 5 mA - determines regulation stiffness and output impedance in feedback networks |
| Reverse Leakage (IR) | 50 nA max at VR = 14 V - ensures minimal error current in high-impedance reference paths |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C - defines maximum continuous DC power handling on standard FR4 PCB |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - relevant for polarity-check or series forward-path configurations |
| Junction Temperature (Tj) | −55 °C to +150 °C - supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HTOL, TC, HAST, and ESD testing |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint optimized for space-constrained PCB layouts.
| 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 mask relief required |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables precise 20 V regulation without post-production trimming in automotive control modules |
| AEC-Q101 qualification | Validated for 15-year automotive service life under thermal cycling, humidity, and vibration stress |
| Low differential resistance (225 Ω) | Minimizes output voltage shift under load variation in voltage reference and feedback divider applications |
| Low reverse leakage (50 nA @ 14 V) | Reduces error current in high-gain op-amp reference circuits and battery-monitoring comparators |
| SOT323 package | Supports automated placement and reflow soldering with IPC-compliant footprint (2.65 mm × 2.35 mm pad layout) |
Applications
| Automotive Sensor Biasing | USB Port Overvoltage Protection |
|---|---|
Use Scenario: Providing stable 20 V bias to analog front-end circuitry in engine control unit (ECU) pressure sensors. IC Role / Device Role / Timing Role: Zener voltage reference establishing fixed bias point for Wheatstone bridge excitation. Use Value: ±2% tolerance and AEC-Q101 qualification ensure long-term stability across −40 °C to +125 °C ambient range. |
Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events in infotainment head units. IC Role / Device Role / Timing Role: Shunt protection element diverting surge energy above 20 V to ground before IC damage occurs. Use Value: 40 W non-repetitive peak power rating handles 100 µs ESD-like transients per IEC 61000-4-2 Level 4. |
| Industrial PLC Analog Input Reference | Low-Power IoT Node Voltage Monitoring |
Use Scenario: Generating precision 20 V reference for 16-bit ADC input scaling in programmable logic controller (PLC) analog modules. IC Role / Device Role / Timing Role: Passive voltage reference source in ratiometric measurement chain with low-drift op-amps. Use Value: 50 nA reverse leakage prevents loading errors in high-impedance divider networks feeding precision amplifiers. |
Use Scenario: Monitoring lithium-thionyl chloride (LiSOCl₂) battery voltage decay in remote asset trackers. IC Role / Device Role / Timing Role: Zener-based comparator threshold generator detecting end-of-life voltage drop below 20 V. Use Value: 275 mW power rating allows direct connection to battery via current-limiting resistor without thermal derating at 25 °C. |
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% tolerance (18.8 V–21.2 V), higher reverse leakage (50 nA at 14 V same), identical package and power rating | Acceptable where cost sensitivity outweighs precision requirement; not suitable for <±1% reference designs | Select when budget constraints dominate and system-level calibration compensates for wider VZ spread |
| MMSZ4684T1G | ±5% tolerance (19 V–21 V), 500 mW Ptot, SOD-123 package (larger footprint), no AEC-Q101 qualification | Higher power handling but lacks automotive qualification; unsuitable for under-hood deployment | Choose only for non-automotive industrial applications requiring >275 mW dissipation |
Compared with BZX84W-B20-QX, the BZX84W-C20-Q trades precision for cost in identical automotive-qualified packaging, while MMSZ4684T1G offers higher power in a non-automotive, larger-footprint package-neither matches the original's combination of ±2% tolerance, AEC-Q101 compliance, and SOT323 size.
Availability
BZX84W-B20-QX is available at Aetrix Electronics and suitable for automotive ECU design, USB interface protection, and industrial PLC analog input conditioning requiring stable component supply with full traceability and lifecycle support.
Supply support for BZX84W-B20-QX 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency and miniaturization.
The BZX84W-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for stable voltage reference and overvoltage protection in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current this Zener can handle at 20 V?
The BZX84W-B20-QX is not rated for continuous reverse conduction at 20 V. Its specified Zener test current is 5 mA, and maximum continuous power dissipation is 275 mW-so sustained operation at 20 V requires limiting current to ≤13.75 mA to stay within thermal limits on standard FR4 PCB.
Does the n.c. pin require grounding or isolation on the PCB?
Pin 2 is internally not connected and must remain electrically floating-no PCB trace, solder mask opening, or thermal pad is required. Connecting it risks mechanical stress or unintended coupling; Nexperia's recommended footprint treats it as an isolated land.
How does temperature affect its 20 V regulation accuracy?
At IZ = 5 mA, the BZX84W-B20-QX exhibits a +16.4 mV/K temperature coefficient, meaning its Zener voltage increases by ~16.4 mV per °C rise in junction temperature-resulting in ~+164 mV drift over a 100 °C operating range (25 °C to 125 °C).
Can this part replace older BZX84C20LT1G in existing designs?
No-BZX84C20LT1G uses SOT23 package with different pinout (cathode/anode reversed vs. SOT323), ±5% tolerance, and no AEC-Q101 qualification. Direct replacement requires PCB layout revision, tolerance reassessment, and automotive qualification revalidation.
BZX84W-B20-QX 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-QX FAQ
1.How can I place an order for BZX84W-B20-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B20-QX 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-QX reliable?
The price and inventory of BZX84W-B20-QX 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-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B20-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B20-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B20-QX?
BZX84W-B20-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B20-QX 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-QX?
For technical support, including BZX84W-B20-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B20-QX requirements.
6.How does Aetrix verify that BZX84W-B20-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B20-QX 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-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B20-QX?
All BZX84W-B20-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B20-QX, 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-QX part is unused and in its original packaging.
Return procedure for BZX84W-B20-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B20-QX Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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