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Nexperia USA Inc. BZX84W-C47F
- Part No.:
- BZX84W-C47F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-C47F.pdf
- Description:
- DIODE ZENER 47V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,377
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Product details
Overview
BZX84W-C47F from Nexperia is a ±5 % tolerance Zener diode with 47 V nominal regulation voltage, 375 Ω typical differential resistance at 2 mA, 46.1 mV/K temperature coefficient, and 0.5 pF junction capacitance at 1 MHz; designed for precision voltage reference and overvoltage protection in compact DC power rails.
For engineers reviewing the BZX84W-C47F datasheet, BZX84W-C47F pinout, BZX84W-C47F application, or BZX84W-C47F equivalent, this part supports stable 47 V clamping in low-power analog monitoring, ESD-protected I/O conditioning, and high-frequency biasing where tight voltage tolerance and minimal parasitic capacitance are critical.
Technical Context
This Zener operates in reverse breakdown with a specified 47 V nominal Zener voltage (VZ) at IZ = 2 mA, exhibiting a positive temperature coefficient of +46.1 mV/K - indicating increasing VZ with junction temperature rise. Its low 0.5 pF junction capacitance enables use up to high frequencies without signal distortion.
The device uses a silicon planar epitaxial process and is rated for 275 mW total power dissipation on FR4 PCB with single-sided copper, with non-repetitive peak reverse power capability of 40 W for 100 µs pulses. It features a 3-pin SOT323 package with Pin 2 internally unconnected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 44.0 V to 50.0 V at IZ = 2 mA - defines precise clamping threshold for 47 V nominal rail protection |
| Differential Resistance rdif | 375 Ω max at IZ = 2 mA - determines regulation stiffness and output impedance under load variation |
| Temperature Coefficient SZ | +46.1 mV/K - quantifies VZ drift per °C, critical for thermal stability in unregulated environments |
| Junction Capacitance Cd | 0.5 pF at f = 1 MHz, VR = 0 V - enables RF bypass and high-speed transient suppression without loading signal paths |
| Forward Voltage VF | ≤ 0.9 V at IF = 10 mA - ensures low-loss forward conduction during polarity-reversal fault conditions |
| Max Power Dissipation Ptot | 275 mW on FR4 PCB - sets continuous thermal limit for ambient operation up to +150 °C |
| Reverse Leakage IR | 50 nA at VR = 32.9 V - guarantees minimal quiescent current draw below breakdown threshold |
Pinout & Package
Package: SOT323 (SC-70), leadless surface-mount plastic package with 3 terminals; dimensions 2.2 mm × 1.35 mm × 0.95 mm (L × W × H); thermal resistance Rth(j-a) = 455 K/W in free air.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-biased terminal; connects to lower-potential side in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally isolated; must remain floating - no PCB trace or solder connection permitted |
| 3 | Cathode (K) | Reverse-biased terminal; connects to higher-potential side and serves as regulation output reference point |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables cost-effective selection for non-critical 47 V references without requiring tighter-bin parts |
| Low 0.5 pF junction capacitance | Preserves signal integrity in >100 MHz applications such as RF detector biasing and fast transient suppression |
| 46.1 mV/K temperature coefficient | Supports predictable VZ drift compensation in thermally varying industrial sensor front-ends |
| 275 mW power rating on standard FR4 | Allows direct integration into space-constrained consumer and IoT PCBs without heatsinking |
| SOT323 footprint compatibility | Matches industry-standard reflow and wave soldering profiles per Figures 9–10 in datasheet |
Applications
| Power Supply Reference | ESD-Protected I/O Clamp |
|---|---|
|
Use Scenario: Providing stable 47 V reference for ADC biasing and op-amp feedback networks in battery-powered instrumentation. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference node voltage independent of supply ripple. Use Value: Delivers <±1.5 % regulation error across −55 °C to +125 °C due to known SZ and low rdif, reducing calibration overhead. |
Use Scenario: Clamping microcontroller GPIO lines exposed to external connectors subject to ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor - conducts during negative transients via forward bias and positive transients via Zener breakdown. Use Value: Limits voltage excursion to ≤47.9 V (max VZ) + 0.9 V (VF) = 48.8 V, protecting 5 V logic inputs without adding series resistance. |
| High-Frequency Bias Network | Overvoltage Detection Threshold |
|
Use Scenario: Setting DC bias point for GaAs FET amplifiers in 2.4 GHz ISM-band transceivers. IC Role / Device Role / Timing Role: Low-capacitance Zener providing stable gate voltage while minimally loading RF matching networks. Use Value: 0.5 pF capacitance avoids detuning of λ/4 stubs and maintains amplifier gain flatness up to 3 GHz. |
Use Scenario: Triggering shutdown circuitry when 48 V telecom input exceeds safe operating range by >5 %. IC Role / Device Role / Timing Role: Precision voltage threshold element feeding comparator input; activates fault flag at 49.4 V (VZ max). Use Value: ±5 % tolerance ensures detection occurs between 49.4 V and 50.0 V - avoiding nuisance trips while guaranteeing protection before 52 V damage threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84W-B47 | ±2 % tolerance (46.1–47.9 V), lower rdif (375 Ω → 300 Ω), same SZ and Cd | Required where tighter regulation (<±1.2 V) is needed for metrology-grade references | Select when absolute voltage accuracy outweighs cost sensitivity; requires binning verification |
| MMBZ5268BS | Same 47 V nominal, ±5 %, but SOT363 package (dual diode), higher Cd (2.5 pF), 350 mW rating | Suitable only when dual-Zener redundancy or board-level space allows larger footprint | Choose only if dual-diode topology matches system architecture; avoid for RF-sensitive nodes |
Compared with BZX84W-C47F, BZX84W-B47 improves voltage accuracy at the expense of higher unit cost and identical thermal performance, while MMBZ5268BS trades packaging flexibility and power margin for degraded high-frequency response due to triple capacitance.
Availability
BZX84W-C47F is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom power supervision, and IoT edge node protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84W-C47F 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 series belongs to Nexperia's general-purpose Zener diode product line, engineered for compact, high-reliability voltage regulation in space-constrained SMT applications across commercial and industrial temperature ranges.
FAQ
What is the maximum reverse current before breakdown for BZX84W-C47F?
At VR = 32.9 V (0.7 × VZnom), the reverse leakage current is guaranteed ≤50 nA. This ultra-low leakage ensures negligible standby power loss in always-on monitoring circuits and prevents false triggering in high-impedance threshold detectors.
Can BZX84W-C47F be used in place of a 47 V TVS diode for surge protection?
No - BZX84W-C47F is rated for 40 W non-repetitive peak reverse power (100 µs pulse), not sustained surge energy. It lacks the robust avalanche ruggedness and standardized IPP ratings of dedicated TVS diodes like P6SMB47A, making it unsuitable for lightning or EFT event suppression.
Is Pin 2 required to be left floating in all PCB layouts?
Yes - Pin 2 is internally not connected (n.c.) and must remain un-soldered and un-traced. Connecting it risks mechanical stress-induced die damage or unintended parasitic coupling; the SOT323 footprint in Figure 9 explicitly excludes solder paste on Pad 2.
How does the +46.1 mV/K temperature coefficient affect long-term voltage stability?
A +46.1 mV/K coefficient means VZ increases by ~1.15 V over a 25 °C to 125 °C junction range. For applications requiring <±0.5 % drift, active compensation or ambient temperature control is necessary - the diode itself provides predictable, linear drift, not instability.
BZX84W-C47F 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:
- ±5%
- 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-C47F FAQ
1.How can I place an order for BZX84W-C47F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-C47F 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-C47F reliable?
The price and inventory of BZX84W-C47F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-C47F is usually 5 days.
3.What payment methods are accepted for BZX84W-C47F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-C47F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-C47F?
BZX84W-C47F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-C47F 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-C47F?
For technical support, including BZX84W-C47F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-C47F requirements.
6.How does Aetrix verify that BZX84W-C47F is sourced from the original manufacturer or authorized distributors?
All BZX84W-C47F 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-C47F meets industry standards.
7.What is the process for return or replacement of BZX84W-C47F?
All BZX84W-C47F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-C47F, 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-C47F part is unused and in its original packaging.
Return procedure for BZX84W-C47F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-C47F Tags
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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