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Nexperia USA Inc. BZX84W-B15X
- Part No.:
- BZX84W-B15X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B15X.pdf
- Description:
- DIODE ZENER 15V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,980
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Product details
Overview
BZX84W-B15X from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 15 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 200 mA maximum forward current - used for precision voltage reference and overvoltage protection in low-power analog signal conditioning circuits.
For engineers reviewing the BZX84W-B15X datasheet, BZX84W-B15X pinout, BZX84W-B15X application, or BZX84W-B15X equivalent, this page delivers verified Zener parameters, thermal resistance (455 K/W), differential resistance (200 Ω), temperature coefficient (+11.4 mV/K), and SC-70 terminal mapping to support accurate circuit modeling and board layout.
Technical Context
This Zener diode operates in reverse breakdown with tightly controlled 15.0 V ±2 % regulation at IZ = 5 mA, exhibiting a positive temperature coefficient of +11.4 mV/K - indicating stable voltage output under rising ambient conditions. Its low 200 Ω differential resistance ensures minimal voltage shift across load current variations.
The device uses silicon planar technology in a leadless SOT323 package with anode (Pin 1), not-connected (Pin 2), and cathode (Pin 3) terminals - enabling compact placement in high-frequency decoupling paths while maintaining thermal performance up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.0 V ±2 % at IZ = 5 mA - defines precise clamping threshold for reference or protection circuits |
| Differential Resistance (rdif) | 200 Ω max at IZ = 5 mA - determines voltage regulation stiffness against current changes |
| Temperature Coefficient (SZ) | +11.4 mV/K at IZ = 5 mA - quantifies voltage drift per degree Celsius rise in junction temperature |
| Total Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous DC power handling under standard mounting |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - limits conduction loss when used in series forward-biased configurations |
| Junction-to-Ambient Thermal Resistance (Rth(j-a)) | 455 K/W - defines temperature rise per watt dissipated in free-air, critical for thermal margining |
| Reverse Current (IR) | 50 nA max at VR = 10.5 V - specifies leakage level below breakdown, affecting standby power in high-impedance nodes |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package: 1.35 mm × 1.75 mm footprint, 0.65 mm pitch, 0.9 mm height, leadless construction with tin-plated terminations compatible with reflow and wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node in reverse-bias configuration; carries reverse current during regulation |
| 2 | Not Connected | Electrically isolated internal pad - must remain unconnected in PCB layout to avoid parasitic coupling |
| 3 | Cathode | Connected to higher-potential node; defines Zener voltage drop direction and polarity-sensitive placement |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation margins than ±5 % variants - suitable for precision reference designs requiring <150 mV error at 15 V |
| Low 200 Ω differential resistance | Minimizes output voltage variation under ±1 mA load current shifts - improves stability in feedback networks |
| Positive +11.4 mV/K temperature coefficient | Compensates for negative TC components in mixed-signal systems - supports thermally balanced voltage references |
| 275 mW power rating on FR4 | Supports sustained operation in space-constrained consumer and industrial PCBs without heatsinking |
Applications
| Power Supply Rail Clamp | ADC Reference Stabilization |
|---|---|
|
Use Scenario: Clamping 15 V supply rail against transient overvoltage events in battery-powered IoT sensor nodes. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess current and hold rail voltage within ±2 % of 15 V. Use Value: Prevents damage to downstream LDOs and microcontrollers by limiting peak rail excursion to ≤15.3 V during 100 µs surges. |
Use Scenario: Providing stable 15 V reference for 12-bit SAR ADC biasing in portable medical instrumentation. IC Role / Device Role / Timing Role: Precision Zener acting as low-noise, low-drift voltage source for ADC reference input. Use Value: Achieves ≤0.2 LSB reference error contribution due to ±2 % VZ tolerance and +11.4 mV/K TC compensation. |
| Signal Level Translation | ESD Protection Interface |
|
Use Scenario: Translating 3.3 V logic signals to 15 V levels for driving optocoupler inputs in isolated PLC I/O modules. IC Role / Device Role / Timing Role: Zener used in series with current-limiting resistor to clamp high-side output to 15 V. Use Value: Ensures clean 15 V logic high with <100 ns response time and no overshoot due to low 2.0 pF capacitance at 0 V. |
Use Scenario: Protecting RS-485 transceiver data lines from ±8 kV contact ESD pulses per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bidirectional Zener pair (with complementary device) absorbing ESD energy before IC input stage. Use Value: Limits line voltage to ±15.3 V during ESD event using 40 W non-repetitive peak power capability at 100 µs pulse width. |
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 | ±5 % tolerance (14.25–15.75 V), same SOT323 package and 275 mW rating | Acceptable where ±0.75 V regulation window suffices; higher production yield lowers cost | Select for cost-sensitive industrial controls where tighter tolerance is unnecessary |
| MMSZ4688T1G | 15 V ±5 %, SOD-123 package, 500 mW Ptot, 300 Ω rdif | Higher power handling but larger footprint and looser regulation; requires different PCB land pattern | Choose only when >275 mW dissipation is required and board area permits SOD-123 |
Compared with BZX84W-C15, the BZX84W-B15X offers 2.5× tighter voltage tolerance at identical thermal and package constraints; versus MMSZ4688T1G, it trades 45 % lower power rating for 30 % smaller footprint and superior regulation accuracy in space-limited designs.
Availability
BZX84W-B15X is available at Aetrix Electronics and suitable for precision voltage reference, overvoltage protection, and signal-level translation applications requiring stable component supply and consistent ±2 % Zener tolerance across production lots.
Supply support for BZX84W-B15X 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 manufacturing rooted in process control and automotive-grade quality systems.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for stable voltage regulation in consumer, industrial, and communication equipment where small size and tight tolerance are critical.
FAQ
What is the maximum reverse current specification for BZX84W-B15X at its rated Zener voltage?
The maximum reverse current (IR) is 50 nA at VR = 10.5 V (0.7 × VZnom), measured at Tj = 25 °C with 300 µs pulse width. This ultra-low leakage ensures minimal loading on high-impedance reference nodes and preserves battery life in always-on sensor circuits.
Can BZX84W-B15X be used in AC signal clipping applications?
Yes - its symmetric forward voltage (≤0.9 V) and sharp reverse breakdown (15.0 V ±2 %) enable bidirectional clipping of audio or sensor signals. Designers must limit peak current to ≤200 mA and ensure average power stays within 275 mW using appropriate series resistance and duty-cycle control.
How does the 200 Ω differential resistance affect regulation accuracy under varying load?
At ±1 mA load current change, the Zener voltage shifts by ±0.2 V (200 Ω × 1 mA). This means regulation remains within ±1.3 % of nominal 15 V across typical 5–10 mA operating range - sufficient for non-critical biasing but insufficient for sub-0.1 % reference needs without additional buffering.
Is BZX84W-B15X qualified for automotive applications?
No - per Nexperia's revision history, the BZX84W series is explicitly non-automotive qualified. It lacks AEC-Q200 stress testing and automotive-grade process controls. For automotive use, select the BZX84W-Q series variants, which undergo extended temperature cycling and humidity testing.
BZX84W-B15X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX84W
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-B15X FAQ
1.How can I place an order for BZX84W-B15X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B15X 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-B15X reliable?
The price and inventory of BZX84W-B15X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B15X is usually 5 days.
3.What payment methods are accepted for BZX84W-B15X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B15X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B15X?
BZX84W-B15X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B15X 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-B15X?
For technical support, including BZX84W-B15X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B15X requirements.
6.How does Aetrix verify that BZX84W-B15X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B15X 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-B15X meets industry standards.
7.What is the process for return or replacement of BZX84W-B15X?
All BZX84W-B15X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B15X, 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-B15X part is unused and in its original packaging.
Return procedure for BZX84W-B15X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B15X Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ4682T1G
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MM5Z5V1ST1G
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