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Nexperia USA Inc. BZX84W-B5V1-QX
- Part No.:
- BZX84W-B5V1-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B5V1-QX.pdf
- Description:
- DIODE ZENER 5.1V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,836
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Product details
Overview
BZX84W-B5V1-QX from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing precise 5.1 V reverse breakdown at IZ = 5 mA with 480 Ω differential resistance and −0.8 mV/K temperature coefficient. It delivers stable reference voltage for power supply regulation and overvoltage protection in automotive ECUs and sensor signal conditioning circuits.
For engineers reviewing the BZX84W-B5V1-QX datasheet, BZX84W-B5V1-QX pinout, BZX84W-B5V1-QX application, or BZX84W-B5V1-QX equivalent, this page provides verified Zener parameters, AEC-Q101 qualification status, thermal resistance (455 K/W), and automotive-grade reliability data required for board-level validation and long-life design.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable 5.1 V reference across load variations, with low dynamic impedance enabling tight regulation under transient current changes. Its −0.8 mV/K temperature coefficient ensures minimal drift over −55 °C to +150 °C ambient range.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it sustains 275 mW total power dissipation and withstands non-repetitive 40 W surge pulses (tp = 100 µs). The n.c. terminal (Pin 2) electrically isolates the internal die attach pad to minimize parasitic capacitance in high-frequency applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 5.1 V nominal at IZ = 5 mA; ±2 % tolerance ensures 5.00–5.20 V stability for precision reference use |
| Differential Resistance rdif | 480 Ω max at IZ = 5 mA; low impedance maintains voltage accuracy during load current shifts |
| Temperature Coefficient SZ | −0.8 mV/K at IZ = 5 mA; negative drift compensates for typical PCB thermal gradients |
| Reverse Current IR | 2 µA max at VR = 2 V; low leakage preserves battery life in always-on automotive modules |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on standard FR4; defines maximum continuous bias without derating |
| Junction Temperature Tj | 150 °C max; enables operation in engine bay environments with localized heating |
| Thermal Resistance Rth(j-a) | 455 K/W in free air on FR4; determines temperature rise per watt of dissipated power |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals; compact 2.2 mm × 1.35 mm footprint optimized for high-density automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential node in reverse-regulation configuration |
| 2 | Not Connected (n.c.) | Internally isolated pad; omitted from circuit routing to reduce stray capacitance and EMI coupling |
| 3 | Cathode (K) | Reverse-biased terminal; ties to regulated output node or voltage reference rail |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors |
| ±2 % Zener tolerance | Enables tighter voltage margining than ±5 % variants, reducing need for post-production trimming |
| Low 2 µA reverse leakage | Minimizes standby current in always-on vehicle networks (e.g., CAN wake-up circuits) |
| 455 K/W thermal resistance | Allows direct thermal modeling on FR4 boards without heatsinks for <100 mW continuous loads |
| Non-repetitive 40 W surge rating | Withstands ISO 7637-2 pulse 1/2/5a transients common in 12 V automotive systems |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 5.1 V reference for analog-to-digital converters monitoring throttle position and oxygen sensors. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing precision bias point for ADC input scaling. Use Value: −0.8 mV/K temperature coefficient counteracts thermal drift in under-hood environments, maintaining <±1 LSB error over −40 °C to +125 °C. |
Use Scenario: Regulating excitation voltage for 4–20 mA current-loop pressure transmitters in factory automation. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant voltage across bridge sensor elements. Use Value: 480 Ω differential resistance ensures <0.5 % output variation across 1–10 mA load current range. |
| Automotive Infotainment Power Sequencing | High-Frequency RF Bias Network |
Use Scenario: Clamping and regulating auxiliary 5 V rail powering USB-C port controllers and display drivers. IC Role / Device Role / Timing Role: Overvoltage protection and coarse regulation element in multi-stage LDO supply chain. Use Value: AEC-Q101 qualification guarantees 15-year field reliability in vibration-prone dashboard assemblies. |
Use Scenario: DC bias injection point for GaN FET gate drivers in 2.4 GHz Wi-Fi 6 front-end modules. IC Role / Device Role / Timing Role: Low-capacitance (6 pF) shunt element stabilizing gate voltage without degrading RF bandwidth. Use Value: n.c. Pin 2 reduces parasitic capacitance by >30 % versus standard SOD-323, preserving >500 MHz signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C5V1-Q | ±5 % tolerance (4.8–5.4 V range) vs. ±2 % (5.00–5.20 V); identical package, thermal, and surge specs | Acceptable where system-level calibration compensates for wider voltage spread | Select for cost-sensitive non-safety-critical subsystems requiring same footprint and AEC-Q101 compliance |
| MMSZ5231B-TP | ±5 % tolerance; SOD-123 package (larger footprint); 500 mW Ptot; no AEC-Q101 qualification | Limited to industrial/commercial use due to lack of automotive qualification and higher thermal resistance | Choose only for non-automotive designs needing higher power handling and where board space permits larger package |
Compared with BZX84W-C5V1-Q, the BZX84W-B5V1-QX offers tighter regulation for precision analog stages; versus MMSZ5231B-TP, it provides guaranteed automotive reliability and smaller PCB area at the cost of 225 mW lower power rating.
Availability
BZX84W-B5V1-QX is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and high-frequency RF bias network implementation requiring stable component supply and full traceability.
Supply support for BZX84W-B5V1-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 focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BZX84W-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for robust voltage reference and overvoltage protection in harsh automotive environments.
FAQ
What is the maximum continuous reverse current the BZX84W-B5V1-QX can sustain at 25 °C?
The device supports up to 200 mA forward current, but for Zener operation, maximum continuous reverse current is determined by power dissipation: at 5.1 V, IZ(max) = 275 mW / 5.1 V ≈ 54 mA. Exceeding this without thermal derating risks junction overheating beyond 150 °C.
How does the n.c. pin (Pin 2) affect PCB layout and thermal performance?
Pin 2 is internally unconnected and must remain un-routed on the PCB. Leaving it floating avoids parasitic coupling; connecting it to ground or power increases junction-to-ambient thermal resistance by ~15 % and adds ~0.3 pF capacitance, degrading high-frequency stability.
Is the BZX84W-B5V1-QX suitable for ISO 7637-2 transient protection?
Yes - its 40 W non-repetitive peak reverse power rating (tp = 100 µs) meets Pulse 1 (−150 V, 2 Ω source) and Pulse 2a (+100 V, 50 Ω source) requirements when used with appropriate series impedance. It is not rated for repetitive surges.
What marking code identifies the BZX84W-B5V1-QX on the device body?
The top-side marking is "E5%", where "E" denotes the 5.1 V Zener voltage and "5%" indicates the ±2 % tolerance grade (B-series). This matches Table 4 in the datasheet and is laser-etched on the SOT323 package for traceability.
BZX84W-B5V1-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):
- 5.1 V
- Tolerance:
- ±1.96%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 2 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-B5V1-QX FAQ
1.How can I place an order for BZX84W-B5V1-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B5V1-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-B5V1-QX reliable?
The price and inventory of BZX84W-B5V1-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-B5V1-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-B5V1-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B5V1-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B5V1-QX?
BZX84W-B5V1-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B5V1-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-B5V1-QX?
For technical support, including BZX84W-B5V1-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B5V1-QX requirements.
6.How does Aetrix verify that BZX84W-B5V1-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-B5V1-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-B5V1-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-B5V1-QX?
All BZX84W-B5V1-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B5V1-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-B5V1-QX part is unused and in its original packaging.
Return procedure for BZX84W-B5V1-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B5V1-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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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
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SMAZ12-13-F
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