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Nexperia USA Inc. BZX84W-C47-QX
- Part No.:
- BZX84W-C47-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C47-QX.pdf
- Description:
- DIODE ZENER 47V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:5,810
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Product details
Overview
BZX84W-C47-QX from Nexperia is a ±5% tolerance Zener diode in SOT323 (SC-70) package, rated for 47 V nominal regulation voltage, 275 mW total power dissipation at 25 °C, and qualified to AEC-Q101 for automotive use. It delivers stable voltage reference in low-power supply rails and ESD-protected signal conditioning circuits.
For engineers reviewing the BZX84W-C47-QX datasheet, BZX84W-C47-QX pinout, BZX84W-C47-QX application, or BZX84W-C47-QX equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (455 K/W), non-repetitive surge capability (40 W), and automotive qualification status.
Technical Context
This device operates as a reverse-biased voltage reference with a specified Zener voltage of 47 V at IZ = 2 mA, differential resistance of 375 Ω at IZ = 2 mA, and temperature coefficient of +46.1 mV/K. Its junction-to-ambient thermal resistance is 455 K/W on FR4 PCB with single-sided copper.
The diode exhibits 0.5 pF capacitance at 1 MHz and 0 V reverse bias, supports non-repetitive peak reverse current up to 1.7 A (for 100 µs pulse), and maintains <100 nA reverse leakage at VR = 0.7 × VZnom.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal at IZ = 2 mA; defines precise clamping level for overvoltage protection |
| Tolerance | ±5% (C-series); ensures predictable regulation band across production lots |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C; sets maximum continuous DC power handling on standard FR4 |
| Differential Resistance (rdif) | 375 Ω at IZ = 2 mA; determines output impedance and regulation stiffness under load variation |
| Reverse Leakage (IR) | ≤50 nA at VR = 32.9 V (0.7 × 47 V); guarantees minimal quiescent current in standby mode |
| Thermal Resistance (Rth(j-a)) | 455 K/W; defines junction temperature rise per watt on standard PCB layout |
| Capacitance (Cd) | 0.5 pF at f = 1 MHz, VR = 0 V; enables high-frequency noise suppression without signal distortion |
Pinout & Package
SOT323 (SC-70) leadless surface-mount plastic package with 3 terminals, 1.3 mm × 1.8 mm footprint, and 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential side in Zener operation |
| 2 | Not Connected (n.c.) | Electrically isolated terminal; no internal bond wire or die connection |
| 3 | Cathode (K) | Reverse-bias voltage input and Zener current return path; tied to higher-potential rail |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Wide voltage range support | Part of 74-type series covering 2.4 V to 75 V, enabling single-source design flexibility |
| Low capacitance | 0.5 pF enables use in RF bias networks and high-speed signal line clamping without loading |
| High surge capability | Withstands 40 W non-repetitive peak reverse power for 100 µs pulses, supporting transient suppression |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage reference for microcontroller ADC inputs monitoring 12 V battery rail in BCM. IC Role / Device Role / Timing Role: Zener diode provides stable 47 V clamp to protect downstream LDO and ADC front-end from load dump transients. Use Value: ±5% tolerance and AEC-Q101 qualification ensure consistent clamping performance across temperature and lifetime in harsh vehicle environments. | Use Scenario: Overvoltage protection for 4–20 mA current loop transmitter output stage. IC Role / Device Role / Timing Role: Acts as precision shunt regulator to limit output voltage during open-circuit fault conditions. Use Value: 375 Ω differential resistance and 0.5 pF capacitance prevent signal distortion while maintaining fast response to overvoltage events. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Reference |
Use Scenario: Secondary-side voltage sensing in isolated flyback converter feedback network. IC Role / Device Role / Timing Role: Provides accurate 47 V reference to optocoupler LED drive circuit for primary-side regulation. Use Value: Low 275 mW power rating matches typical feedback circuit power budgets; SOT323 footprint enables compact board layout. | Use Scenario: Precision voltage clamp in analog front-end of portable ECG amplifier. IC Role / Device Role / Timing Role: Limits common-mode voltage swing to protect instrumentation amplifier inputs from ESD and overvoltage. Use Value: 50 nA reverse leakage minimizes offset error contribution; AEC-Q101 qualification supports long-term stability requirements. |
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-Q | Same electrical specs and AEC-Q101 qualification; differs only in marking code (U4% vs U4X) | No functional difference; identical use cases and board-level compatibility | Select when standard marking suffices and traceability to specific wafer lot is not required |
| MMSZ47ET1G | ±5% tolerance, 47 V, but rated for 500 mW Ptot and uses SOD-123 package (larger footprint) | Higher power handling suits higher-current regulation; larger package eases manual rework but increases board area | Choose for non-automotive designs needing >275 mW dissipation or legacy SOD-123 layout compatibility |
Compared with BZX84W-C47-QX, the BZX84W-C47-Q offers identical performance with simplified traceability, while MMSZ47ET1G trades automotive qualification and miniaturization for higher power capacity and through-hole-compatible packaging.
Availability
BZX84W-C47-QX is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor transmitters, and medical diagnostic equipment requiring stable component supply with full AEC-Q101 compliance and lot-level traceability.
Supply support for BZX84W-C47-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 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 Zener diode product line, engineered specifically for robust voltage regulation and transient protection in engine control units, ADAS sensors, and infotainment power supplies.
FAQ
What is the maximum continuous reverse current this diode can handle at 47 V?
The BZX84W-C47-QX is not rated for continuous reverse conduction at 47 V. Its maximum continuous power dissipation is 275 mW, limiting average reverse current to approximately 5.85 mA (275 mW ÷ 47 V). Exceeding this causes thermal runaway due to its positive temperature coefficient above ~5 V.
Does the 'n.c.' pin require PCB routing or grounding?
No - Pin 2 is internally not connected and must remain unconnected on the PCB. Routing or grounding it introduces risk of solder bridging, mechanical stress, or unintended parasitic coupling. The SOT323 footprint in Figure 9 explicitly shows no pad or trace for terminal 2.
How does the +46.1 mV/K temperature coefficient affect regulation accuracy over temperature?
At 47 V nominal, +46.1 mV/K means VZ increases by ~4.6 V over a 100 K rise (e.g., −40 °C to +60 °C ambient). This drift is inherent to Zener diodes above 6 V and must be compensated in precision references via external circuitry or calibration - the device itself provides stable relative regulation within its operating range.
Can this diode replace a 1N4750A in an existing design?
No - the 1N4750A is a 50 V, 1 W through-hole Zener in DO-41 package. BZX84W-C47-QX is 47 V, 275 mW, SOT323, and AEC-Q101 qualified. Direct replacement requires verifying that 47 V vs. 50 V, reduced power, and SMT footprint meet system requirements; thermal and surge margins will differ significantly.
BZX84W-C47-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):
- 47 V
- Tolerance:
- ±6.38%
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84W-C47-QX FAQ
1.How can I place an order for BZX84W-C47-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C47-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-C47-QX reliable?
The price and inventory of BZX84W-C47-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-C47-QX is usually 5 days.
3.What payment methods are accepted for BZX84W-C47-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C47-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C47-QX?
BZX84W-C47-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C47-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-C47-QX?
For technical support, including BZX84W-C47-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C47-QX requirements.
6.How does Aetrix verify that BZX84W-C47-QX is sourced from the original manufacturer or authorized distributors?
All BZX84W-C47-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-C47-QX meets industry standards.
7.What is the process for return or replacement of BZX84W-C47-QX?
All BZX84W-C47-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C47-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-C47-QX part is unused and in its original packaging.
Return procedure for BZX84W-C47-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C47-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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