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Nexperia USA Inc. BZX84W-B4V7X
- Part No.:
- BZX84W-B4V7X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B4V7X.pdf
- Description:
- DIODE ZENER 4.7V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
BZX84W-B4V7X from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, rated for 4.7 V nominal breakdown voltage at 5 mA, 275 mW total power dissipation on FR4 PCB, and 150 °C maximum junction temperature. It delivers stable reference voltage in low-power analog circuits, voltage clamping in signal conditioning paths, and overvoltage protection in sensor interface modules.
For engineers reviewing the BZX84W-B4V7X datasheet, BZX84W-B4V7X pinout, BZX84W-B4V7X application, or BZX84W-B4V7X equivalent, key selection criteria include Zener voltage tolerance (±2 %), differential resistance (80 Ω at 5 mA), reverse leakage current (3 µA at VR = 2 V), thermal resistance (455 K/W), and SOT323 footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse-bias breakdown mode to maintain a stable 4.7 V reference across its cathode-anode terminals under regulated current conditions. Its ±2 % tolerance ensures tight voltage accuracy for precision biasing and feedback networks in DC-DC converters and LDO regulators.
The device exhibits a negative temperature coefficient of −1.4 mV/K at 5 mA, enabling predictable drift compensation in temperature-sensitive references. Its 80 Ω differential resistance at 5 mA supports low dynamic impedance for effective noise suppression in analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.61 V to 4.79 V at IZ = 5 mA - defines precise regulation window for reference stability |
| Tolerance | ±2 % - enables tighter system-level voltage margin control vs. ±5 % variants |
| Differential Resistance (rdif) | 80 Ω at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| Reverse Leakage Current (IR) | 3 µA at VR = 2 V - limits standby power loss in always-on monitoring circuits |
| Total Power Dissipation (Ptot) | 275 mW on FR4 PCB - sets maximum continuous power handling in standard SMT layout |
| Thermal Resistance (Rth(j-a)) | 455 K/W - defines junction-to-ambient temperature rise per watt under natural convection |
| Forward Voltage (VF) | 0.9 V at IF = 10 mA - constrains forward conduction loss in dual-direction clamp configurations |
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 assembly and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward current entry point; connected to lower-potential node in Zener operation |
| 2 | Not Connected (n.c.) | Electrically isolated terminal; no internal bond wire or die connection |
| 3 | Cathode (K) | Reverse-bias voltage reference node; connected to higher-potential rail in regulation mode |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables accurate 4.7 V reference without post-production trimming in cost-sensitive consumer and industrial designs |
| Low differential resistance (80 Ω) | Minimizes output voltage variation under load transients in feedback loops of switching regulators |
| High-frequency capability | Diode capacitance ≤6 pF at 1 MHz enables use in RF bias networks and fast transient suppression up to ~100 MHz |
| SOT323 package compatibility | Supports automated pick-and-place and reflow processes with industry-standard land pattern (2.65 mm × 2.35 mm) |
Applications
| Power Supply Reference | Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Providing stable 4.7 V reference for ADC voltage dividers and op-amp biasing in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference potential relative to ground. Use Value: ±2 % tolerance ensures <±0.1 V error in 4.7 V reference, directly improving 12-bit ADC measurement linearity by ≥0.8 LSB. |
Use Scenario: Clamping amplified sensor outputs (e.g., thermistor or pressure bridge) to prevent overvoltage damage to MCU inputs. IC Role / Device Role / Timing Role: Bidirectional voltage limiter using forward conduction (0.9 V) and reverse Zener action (4.7 V). Use Value: 80 Ω rdif and 3 µA leakage ensure minimal loading on high-impedance sensor outputs while limiting transients within 100 ns. |
| Overvoltage Protection | Low-Power Bias Network |
|
Use Scenario: Protecting USB data lines and microcontroller GPIOs against ESD-induced surges in portable medical devices. IC Role / Device Role / Timing Role: Transient voltage suppressor activated during >4.7 V excursions, shunting current to ground. Use Value: 40 W non-repetitive peak power rating (100 µs pulse) absorbs IEC 61000-4-2 Level 4 ESD events without degradation. |
Use Scenario: Generating stable bias points for discrete transistor amplifiers in hearing aid front-end circuits. IC Role / Device Role / Timing Role: Precision voltage source establishing emitter/base potentials in Class-A amplifier stages. Use Value: −1.4 mV/K temperature coefficient allows predictable drift tracking, reducing calibration frequency in wearable devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5225BS | Same 4.7 V nominal, ±5 % tolerance, 225 mW Ptot, SOT-23 package | Higher power derating above 70 °C due to larger thermal resistance (500 K/W) | Select when ±5 % tolerance is acceptable and SOT-23 board space is available |
| Vishay BZX84-C4V7 | Same 4.7 V nominal, ±5 % tolerance, 300 mW Ptot, SOT-23 package | Higher leakage (5 µA at VR = 2 V) and wider voltage spread (4.4–5.0 V) | Select for cost-sensitive applications where tighter tolerance is not required |
Compared with BZX84W-B4V7X, MMBZ5225BS offers identical voltage but looser tolerance and higher thermal resistance, while BZX84-C4V7 trades tolerance for higher power rating and increased leakage-making the BZX84W-B4V7X optimal for precision, space-constrained, low-leakage designs.
Availability
BZX84W-B4V7X is available at Aetrix Electronics and suitable for power supply reference, sensor signal conditioning, overvoltage protection, and low-power bias network applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for BZX84W-B4V7X 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 logic, discrete, and MOSFET components for automotive, industrial, and consumer markets.
The BZX84W series belongs to Nexperia's general-purpose Zener diode product line, designed specifically for compact, high-frequency voltage regulation and clamping in space-constrained SMT applications.
FAQ
What is the maximum reverse current before breakdown for BZX84W-B4V7X?
At VR = 2 V, the reverse leakage current is specified at 3 µA maximum. This value reflects the diode's off-state conduction prior to reaching its 4.7 V Zener knee, critical for minimizing quiescent current in always-on circuits.
Can BZX84W-B4V7X be used in bidirectional ESD protection?
No-it functions unidirectionally as a Zener regulator in reverse bias and a standard diode in forward bias (0.9 V drop). For true bidirectional ESD protection, dedicated TVS diodes like PESD5V0S1BA are required.
How does the SOT323 package affect thermal performance?
Mounted on FR4 with single-sided copper, the SOT323 package yields 455 K/W junction-to-ambient thermal resistance. This limits continuous power to 275 mW at 25 °C ambient; derating is required above 70 °C ambient per the datasheet curve.
Is BZX84W-B4V7X automotive qualified?
No-this part is non-automotive qualified per Revision History v.2 (January 2023). Nexperia offers separate -Q automotive variants (e.g., BZX84W-Q series) with AEC-Q101 qualification and extended temperature screening.
BZX84W-B4V7X 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):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 275 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 2 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-B4V7X FAQ
1.How can I place an order for BZX84W-B4V7X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B4V7X 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-B4V7X reliable?
The price and inventory of BZX84W-B4V7X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B4V7X is usually 5 days.
3.What payment methods are accepted for BZX84W-B4V7X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B4V7X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B4V7X?
BZX84W-B4V7X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B4V7X 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-B4V7X?
For technical support, including BZX84W-B4V7X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B4V7X requirements.
6.How does Aetrix verify that BZX84W-B4V7X is sourced from the original manufacturer or authorized distributors?
All BZX84W-B4V7X 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-B4V7X meets industry standards.
7.What is the process for return or replacement of BZX84W-B4V7X?
All BZX84W-B4V7X units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B4V7X, 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-B4V7X part is unused and in its original packaging.
Return procedure for BZX84W-B4V7X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B4V7X Tags
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MM5Z5V1ST1G
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