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Nexperia USA Inc. BZX84W-B15-QF
- Part No.:
- BZX84W-B15-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B15-QF.pdf
- Description:
- DIODE ZENER 15V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:4,627
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Product details
Overview
BZX84W-B15-QF from Nexperia is a ±2% tolerance Zener voltage regulator diode rated at 15 V nominal breakdown voltage, 275 mW total power dissipation, and qualified to AEC-Q101 for automotive use. It operates in reverse-bias regulation mode, provides stable reference voltage in power supply rails and overvoltage protection circuits, and is packaged in SOT323 (SC-70) for space-constrained PCB layouts.
For engineers reviewing the BZX84W-B15-QF datasheet, BZX84W-B15-QF pinout, BZX84W-B15-QF application, or BZX84W-B15-QF equivalent, key selection criteria include its 15 V Zener voltage with ±2% tolerance, low differential resistance of 200 Ω at IZ = 5 mA, temperature coefficient of +11.4 mV/K, and automotive-grade reliability under −55 °C to +150 °C ambient conditions.
Technical Context
This Zener diode functions as a precision shunt voltage reference in reverse-biased operation, maintaining regulation across load and line variations via controlled avalanche breakdown at 15 V. Its differential resistance of 200 Ω at 5 mA ensures minimal output voltage deviation under dynamic current changes.
The device exhibits a positive temperature coefficient of +11.4 mV/K at 5 mA, enabling predictable thermal drift behavior in temperature-sensitive references. It supports non-repetitive surge handling up to 40 W for 100 µs pulses and is characterized for stable performance from −55 °C to +150 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener voltage (VZ) | 15 V nominal, ±2% tolerance - defines precise regulation point for reference or clamping applications |
| Differential resistance (rdif) | 200 Ω at IZ = 5 mA - determines output impedance and regulation stability under load variation |
| Temperature coefficient (SZ) | +11.4 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius for thermal design margining |
| Total power dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous DC power handling in standard layout |
| Reverse current (IR) | 50 nA at VR = 10.5 V - specifies leakage level below breakdown, critical for low-power standby circuits |
| Junction-to-ambient thermal resistance (Rth(j-a)) | 455 K/W - determines temperature rise above ambient per watt dissipated in standard mounting |
| Non-repetitive peak reverse power (PZSM) | 40 W for tp = 100 µs - defines transient surge capability for ESD or inductive spike suppression |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals, footprint optimized for reflow soldering per Figure 9 in datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-bias terminal; connected to lower-potential side in regulation configuration |
| 2 | Not connected (n.c.) | Internally unconnected; must remain floating-no PCB trace or solder mask opening required |
| 3 | Cathode (K) | Reverse-bias terminal; connected to higher-potential side and load return in shunt regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring high reliability |
| ±2% Zener voltage tolerance | Enables tighter regulation margins than ±5% variants, reducing need for post-production trimming |
| SOT323 ultra-small footprint | 1.3 mm × 1.8 mm outline with 0.65 mm pitch - supports high-density routing in compact consumer and automotive modules |
| Low leakage current | 50 nA at 70% of VZ - minimizes quiescent current draw in battery-powered or always-on circuits |
| Controlled positive temperature coefficient | +11.4 mV/K allows predictable compensation when paired with negative-coefficient components in reference designs |
Applications
| Automotive Power Rail Clamping | Industrial Sensor Reference Supply |
|---|---|
|
Use Scenario: Protecting 12 V CAN bus transceivers against load dump transients up to 40 V. IC Role / Device Role / Timing Role: Shunt clamp placed between VCC and GND, conducting excess energy during overvoltage events. Use Value: Withstands 40 W non-repetitive surges and maintains 15 V clamping threshold within ±2%, preventing IC damage without external TVS dependency. |
Use Scenario: Providing stable bias voltage for analog front-end amplifiers in factory-floor pressure sensors. IC Role / Device Role / Timing Role: Precision shunt reference generating fixed 15 V rail for op-amp biasing and ADC reference scaling. Use Value: 200 Ω differential resistance and +11.4 mV/K temperature coefficient enable <10 mV total drift over −40 °C to +85 °C operating range. |
| Consumer Device Overvoltage Protection | Medical Instrument Voltage Monitoring |
|
Use Scenario: Safeguarding USB-C PD negotiation circuitry from accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Reverse-biased Zener limiting input voltage to 15 V while sinking fault current to ground. Use Value: 275 mW steady-state rating and 455 K/W thermal resistance allow sustained 100 mA fault current handling on standard FR4 without derating. |
Use Scenario: Monitoring battery pack voltage in portable defibrillators using comparator-based undervoltage lockout. IC Role / Device Role / Timing Role: Stable 15 V reference feeding comparator hysteresis network for accurate 14.2 V–14.8 V trip window. Use Value: 50 nA leakage at 10.5 V ensures <1 µA current drain on 3.7 V Li-ion cells during multi-year shelf life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C15-Q | Same 15 V nominal voltage but ±5% tolerance (vs. ±2%) and higher differential resistance (300 Ω vs. 200 Ω) | Acceptable where regulation accuracy >±300 mV is sufficient and cost sensitivity outweighs precision needs | Select for cost-driven consumer applications where tighter tolerance is unnecessary |
| MMSZ5245B-TP | 15 V ±5%, 500 mW Ptot, SOD-123 package, 100 Ω rdif at 20 mA - higher power but larger footprint and looser tolerance | Suitable for higher-current regulation (>20 mA) where board area permits larger package | Choose when >275 mW continuous dissipation is required and SOT323 size constraint is relaxed |
Compared with BZX84W-C15-Q, the BZX84W-B15-QF offers tighter voltage control and lower impedance for precision references; versus MMSZ5245B-TP, it trades power capacity and lower rdif for significantly smaller PCB area and automotive qualification.
Availability
BZX84W-B15-QF is available at Aetrix Electronics and suitable for automotive power management, industrial sensor conditioning, and medical instrument voltage monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX84W-B15-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 advanced packaging.
The BZX84W-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for robust voltage regulation and transient protection in harsh-environment electronic control units.
FAQ
What is the maximum continuous reverse current the BZX84W-B15-QF can sustain at 25 °C?
The device supports a maximum forward current of 200 mA, but as a Zener diode operating in reverse breakdown, its continuous reverse current is limited by power dissipation. At 25 °C ambient and 275 mW Ptot, the maximum sustainable reverse current is 18.3 mA (275 mW ÷ 15 V), assuming no additional thermal derating from PCB layout or airflow.
Does the n.c. pin (pin 2) require any PCB layout consideration?
No. Pin 2 is internally not connected and must remain electrically floating. No copper trace, solder mask opening, or thermal pad should be assigned to this terminal. The SOT323 footprint in Figure 9 of the datasheet explicitly excludes pin 2 from solder land definition, confirming its isolation from both electrical and thermal paths.
How does the +11.4 mV/K temperature coefficient impact regulation accuracy over temperature?
At IZ = 5 mA, the coefficient causes a +11.4 mV increase in VZ per Kelvin rise. Over a −40 °C to +125 °C junction range (165 K delta), total drift is +1.88 V - resulting in a regulation band from 13.12 V to 16.88 V. This must be accounted for in reference-critical designs, though the tight ±2% initial tolerance still holds at 25 °C.
Can BZX84W-B15-QF replace older BZX84-C15 in existing designs?
Yes, with caveats: both share identical 15 V nominal voltage and SOT23 package pinout, but BZX84W-B15-QF uses SOT323 (smaller), has ±2% tolerance (vs. ±5%), and is AEC-Q101 qualified. Layout redesign is required for the smaller footprint, and the tighter tolerance may affect calibration points in legacy circuits originally designed for ±5% variation.
BZX84W-B15-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):
- 15 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.5 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-B15-QF FAQ
1.How can I place an order for BZX84W-B15-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B15-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-B15-QF reliable?
The price and inventory of BZX84W-B15-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-B15-QF is usually 5 days.
3.What payment methods are accepted for BZX84W-B15-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B15-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B15-QF?
BZX84W-B15-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B15-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-B15-QF?
For technical support, including BZX84W-B15-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B15-QF requirements.
6.How does Aetrix verify that BZX84W-B15-QF is sourced from the original manufacturer or authorized distributors?
All BZX84W-B15-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-B15-QF meets industry standards.
7.What is the process for return or replacement of BZX84W-B15-QF?
All BZX84W-B15-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B15-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-B15-QF part is unused and in its original packaging.
Return procedure for BZX84W-B15-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B15-QF Tags
-
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
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
-
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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