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Nexperia USA Inc. BZX84W-B47X
- Part No.:
- BZX84W-B47X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B47X.pdf
- Description:
- DIODE ZENER 47V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,062
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Product details
Overview
BZX84W-B47X from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 47 V nominal Zener voltage at 5 mA, 275 mW total power dissipation, and 170 Ω differential resistance - used for precision voltage reference and overvoltage protection in low-power analog signal conditioning circuits.
For engineers reviewing the BZX84W-B47X datasheet, BZX84W-B47X pinout, BZX84W-B47X application, or BZX84W-B47X equivalent, this page delivers verified Zener voltage, thermal resistance, reverse leakage, forward voltage, and package-specific soldering footprint data required for PCB layout, reliability analysis, and replacement validation.
Technical Context
This device operates as a two-terminal shunt regulator with stable 47 V breakdown under reverse bias at IZ = 5 mA, exhibiting a positive temperature coefficient of +46.1 mV/K to counteract thermal drift in reference designs. Its 170 Ω differential resistance ensures minimal output voltage variation across load current changes.
The SOT323 package enables high-density placement on FR4 PCBs with single-sided copper, delivering 455 K/W junction-to-ambient thermal resistance and supporting reflow/wave soldering per defined footprints. Non-repetitive peak reverse power dissipation reaches 40 W for 100 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 46.1 V to 47.9 V at IZ = 5 mA - defines precise regulation threshold for 47 V reference designs |
| Tolerance | ±2 % - enables tighter voltage margin control than ±5 % variants in feedback loops |
| Differential Resistance rdif | 170 Ω max at IZ = 5 mA - limits output voltage shift under dynamic load transients |
| Total Power Dissipation Ptot | 275 mW at Tamb = 25 °C on FR4 PCB - sets maximum continuous DC power handling capability |
| Forward Voltage VF | 0.9 V max at IF = 10 mA - constrains forward conduction loss in clamp or dual-direction protection |
| Reverse Leakage IR | 50 nA max at VR = 0.7 × VZnom - ensures negligible standby current in high-impedance bias networks |
| Junction Temperature Tj | −55 °C to +150 °C - supports operation in industrial ambient environments without derating |
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 PCB layouts and automated assembly.
| 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 isolated; must remain unconnected on PCB to avoid parasitic coupling or mechanical stress |
| 3 | Cathode (K) | Reverse-biased terminal; ties to regulated output node and current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables direct use in 12-bit ADC reference buffers without trimming resistors |
| 170 Ω differential resistance | Maintains <±15 mV output deviation across ±1 mA load current variation |
| 455 K/W thermal resistance (j-a) | Allows 100 °C junction rise at full 275 mW dissipation on standard FR4 board |
| Non-repetitive 40 W pulse rating | Clamps ESD transients up to 40 V × 1 A without degradation (100 µs duration) |
| 0.9 V forward voltage | Permits bidirectional clamping when paired with series diode in signal line protection |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Voltage Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure transmitters operating from 24 V rails. IC Role / Device Role / Timing Role: Shunt Zener regulator providing fixed 47 V reference for op-amp gain-setting network. Use Value: ±2 % tolerance eliminates need for post-calibration trimmers; 170 Ω rdif maintains <0.1 % gain error across sensor temperature range. |
Use Scenario: Generating stable reference for internal ADC in battery-powered IoT edge nodes with 3.3 V supply. IC Role / Device Role / Timing Role: Precision Zener diode biased at 100 µA to feed external voltage divider into ADC REF pin. Use Value: 50 nA reverse leakage prevents >1 µA standby current increase; 47 V rating allows safe operation with 3.3 V LDO dropout margin. |
| ESD Protection Clamp for Analog Inputs | Overvoltage Crowbar in Power Supply Feedback |
Use Scenario: Protecting op-amp inputs against ±8 kV HBM ESD events in medical diagnostic front-ends. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting input voltage to 47 V during surge, paired with series current-limiting resistor. Use Value: 40 W non-repetitive pulse rating absorbs full IEC 61000-4-2 contact discharge energy; SOT323 footprint minimizes trace inductance. |
Use Scenario: Safeguarding SMPS feedback loop against optocoupler failure-induced overvoltage in 48 V telecom supplies. IC Role / Device Role / Timing Role: Zener-triggered crowbar that shorts feedback node to ground when output exceeds 47 V. Use Value: Sharp 47 V knee enables sub-100 ns response to overvoltage; 275 mW rating sustains latch condition until primary controller resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-C47 | ±5 % tolerance (44–50 V range), 200 Ω rdif, same package and Ptot | Acceptable where system-level calibration compensates for wider voltage spread | Select for cost-sensitive designs where ±5 % regulation accuracy suffices |
| MMSZ47ET1G | ±5 % tolerance, 100 Ω rdif, SOD-123 package, 500 mW Ptot | Higher power handling but larger footprint; requires PCB redesign | Choose when higher surge immunity or thermal margin is needed beyond 275 mW |
Compared with BZX84W-B47X, BZX84W-C47 trades tighter voltage control for lower unit cost, while MMSZ47ET1G offers improved thermal performance at the expense of board space and compatibility with SOT323 assembly lines.
Availability
BZX84W-B47X is available at Aetrix Electronics and suitable for industrial sensor interfaces, low-power microcontroller references, ESD protection circuits, and power supply overvoltage safeguards requiring stable component supply and consistent parametric performance across production lots.
Supply support for BZX84W-B47X 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 technology leadership and automotive-grade quality systems.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, engineered for precision voltage regulation and transient suppression in cost-sensitive, space-constrained consumer and industrial applications.
FAQ
What is the exact Zener voltage range for BZX84W-B47X at 5 mA test current?
The BZX84W-B47X exhibits a guaranteed Zener voltage range of 46.1 V to 47.9 V when measured at IZ = 5 mA and Tj = 25 °C, per Table 8 of the official Nexperia datasheet Rev. 2 (January 2023). This ±2 % tolerance is confirmed by electrical testing during production screening.
Can BZX84W-B47X be used in bidirectional ESD protection configurations?
Yes - its 0.9 V forward voltage at 10 mA and 47 V reverse breakdown allow pairing with a series diode to form a symmetrical ±47.9 V clamp. The SOT323 package's low parasitic inductance (<0.5 nH) supports effective high-frequency transient suppression up to 400 MHz.
How does thermal resistance affect maximum power derating above 25 °C ambient?
With Rth(j-a) = 455 K/W, BZX84W-B47X loses 0.61 mW/°C of allowable power above 25 °C ambient. At 85 °C ambient, maximum continuous dissipation drops to 142 mW - calculated as 275 mW − (455 K/W × 60 K) - requiring explicit thermal design review for sustained operation.
Is Pin 2 truly unconnected, or does it serve a mechanical or thermal function?
Pin 2 is electrically unconnected (n.c.) per Nexperia's pinning diagram and internal construction. It serves no circuit role and must not be soldered or tied to any net. Its presence aids mechanical stability during pick-and-place but carries zero electrical potential or thermal path in the SOT323 mold compound structure.
BZX84W-B47X 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):
- 47 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 170 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.9 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-B47X FAQ
1.How can I place an order for BZX84W-B47X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B47X 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-B47X reliable?
The price and inventory of BZX84W-B47X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B47X is usually 5 days.
3.What payment methods are accepted for BZX84W-B47X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B47X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B47X?
BZX84W-B47X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B47X 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-B47X?
For technical support, including BZX84W-B47X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B47X requirements.
6.How does Aetrix verify that BZX84W-B47X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B47X 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-B47X meets industry standards.
7.What is the process for return or replacement of BZX84W-B47X?
All BZX84W-B47X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B47X, 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-B47X part is unused and in its original packaging.
Return procedure for BZX84W-B47X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B47X 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
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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