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Nexperia USA Inc. BZX84W-B4V7F
- Part No.:
- BZX84W-B4V7F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84W-B4V7F.pdf
- Description:
- DIODE ZENER 4.7V 275MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:16,609
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Product details
Overview
BZX84W-B4V7F from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOT323 (SC-70) package, providing precise 4.7 V reverse breakdown at IZ = 5 mA, with 500 Ω typical differential resistance and 3 µA maximum reverse current at VR = 2 V, used for low-power voltage reference and overvoltage clamping in portable power management circuits.
For engineers reviewing the BZX84W-B4V7F datasheet, BZX84W-B4V7F pinout, BZX84W-B4V7F application, or BZX84W-B4V7F equivalent, this page delivers verified Zener parameters, thermal derating guidance, SOT323 terminal mapping, and direct alternatives for precision regulation in space-constrained designs.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain stable 4.7 V across its cathode-anode terminals under regulated current conditions. Its ±2 % tolerance ensures tight voltage accuracy critical for reference and feedback paths in DC-DC converters and LDOs.
Designed for surface-mount use on FR4 PCBs with single-sided copper, it exhibits 455 K/W junction-to-ambient thermal resistance and supports up to 275 mW steady-state dissipation at Tamb = 25 °C, with non-repetitive surge capability of 40 W for 100 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V nominal at IZ = 5 mA; defines stable regulation point for feedback networks |
| Tolerance | ±2 % (B-series); enables tighter output voltage control vs. ±5 % C-series variants |
| Differential Resistance (rdif) | 500 Ω max at IZ = 5 mA; determines load regulation sensitivity and ripple rejection |
| Reverse Current (IR) | 3 µA max at VR = 2 V; ensures low leakage in standby and high-impedance bias networks |
| Power Dissipation (Ptot) | 275 mW at Tamb = 25 °C on standard FR4; sets maximum continuous operating current limit |
| Junction Temperature (Tj) | 150 °C max; defines thermal safety margin for reliability in compact enclosures |
| Package | SOT323 (SC-70); 1.3 mm × 1.8 mm footprint ideal for high-density portable PCB layouts |
Pinout & Package
SOT323 (SC-70) is a leadless, surface-mount plastic package with three terminals in a compact 1.3 mm × 1.8 mm outline and 0.65 mm pitch. It features tin-plated terminations compatible with standard reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Forward-bias connection; tied to lower potential side in Zener regulation configuration |
| 2 | Not Connected (n.c.) | Internally isolated; must remain unconnected on PCB to avoid parasitic coupling or shorting |
| 3 | Cathode (K) | Reverse-bias connection; tied to higher potential side and serves as regulated output node |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables accurate voltage setting in precision feedback loops without external trimming |
| Low 3 µA reverse leakage at 2 V | Minimizes quiescent current draw in battery-powered sensor nodes and sleep-mode circuits |
| 500 Ω max differential resistance | Reduces output voltage shift under varying load currents in shunt regulator topologies |
| SOT323 package with 0.65 mm pitch | Supports automated placement and reflow in high-volume manufacturing of miniaturized modules |
| 150 °C maximum junction temperature | Allows operation in thermally demanding environments such as enclosed industrial controllers |
Applications
| USB Power Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamping transient surges on 5 V USB VBUS lines to prevent damage to downstream ICs. IC Role / Device Role / Timing Role: Zener acts as fast-acting shunt clamp, conducting excess energy above 4.7 V to ground during ESD or load-dump events. Use Value: Limits peak voltage to ≤5.2 V (within USB 2.0 spec), leveraging 40 W non-repetitive surge rating for robustness. |
Use Scenario: Generating a clean, temperature-stable reset threshold for 3.3 V microcontrollers. IC Role / Device Role / Timing Role: Provides reference voltage to comparator-based reset generator, triggering reset when supply drops below 4.7 V × (R1/(R1+R2)). Use Value: ±2 % tolerance ensures reset assertion within ±0.1 V, meeting tight MCU brown-out detection requirements. |
| Portable Sensor Biasing | LED Current Regulation |
Use Scenario: Supplying stable bias voltage to analog front-end op-amps in wearable health monitors. IC Role / Device Role / Timing Role: Functions as low-current shunt reference in high-impedance divider network feeding op-amp input stages. Use Value: 3 µA max reverse leakage avoids loading sensitive bias nodes, preserving signal integrity in µA-level sensor interfaces. |
Use Scenario: Setting constant current for indicator LEDs in handheld test equipment. IC Role / Device Role / Timing Role: Used in series with LED and current-limiting resistor to fix forward voltage drop, stabilizing current against supply variation. Use Value: 500 Ω rdif limits current drift to <±2% over 100 mV input change, ensuring consistent LED brightness. |
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 ±5 %, 225 mW Ptot, SOT-23 package (larger footprint, 2.9 mm × 1.3 mm) | Higher thermal resistance (~600 K/W) reduces usable power in confined layouts | Select when legacy SOT-23 footprint compatibility is required over size optimization |
| Vishay BZX84-C4V7 | Same 4.7 V but ±5 % tolerance, identical SOT323 package and 275 mW rating | Looser voltage accuracy increases reset threshold uncertainty by ±0.235 V | Choose for cost-sensitive designs where ±5 % regulation is acceptable |
Compared with BZX84W-B4V7F, MMBZ5225BS trades smaller size for higher thermal resistance and looser packaging compatibility, while BZX84-C4V7 retains identical form factor but sacrifices 0.1 V regulation precision-making the B-series optimal for accuracy-critical feedback and protection roles.
Availability
BZX84W-B4V7F is available at Aetrix Electronics and suitable for USB power protection, microcontroller reset circuits, portable sensor biasing, and LED current regulation requiring stable component supply across high-mix production runs.
Supply support for BZX84W-B4V7F 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 and industrial-grade components.
The BZX84W series is part of Nexperia's general-purpose Zener portfolio designed specifically for space-constrained, low-power voltage regulation and clamping in consumer, computing, and industrial electronics.
FAQ
What is the maximum continuous reverse current for reliable long-term operation?
The BZX84W-B4V7F supports up to 57 mA continuous reverse current (IZ) at 25 °C ambient when mounted on standard FR4, derived from its 275 mW power rating and 4.7 V Zener voltage. Derating is required above 25 °C per the 455 K/W thermal resistance specification.
Can this Zener be used in series with another diode for higher voltage reference generation?
Yes-stacking multiple BZX84W-B4V7F units in series yields additive Zener voltages (e.g., two in series ≈ 9.4 V), but tolerance accumulates linearly (±4 % total) and thermal tracking between devices is not guaranteed, limiting use to non-critical applications.
Is the n.c. pin electrically isolated or internally bonded?
Pin 2 is confirmed as "not connected" per Nexperia's official pinning table and internal die layout-no bond wire or metallization links it to the silicon die, making it fully electrically isolated and safe to leave unconnected or tie to ground if needed for mechanical stability.
How does temperature affect regulation accuracy at 4.7 V?
At 4.7 V, the BZX84W-B4V7F exhibits a positive temperature coefficient of +1.4 mV/K near IZ = 5 mA, meaning output voltage rises ~0.14 V over a 100 °C junction range-critical for designs operating beyond 25 °C ambient where thermal compensation may be needed.
BZX84W-B4V7F 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-B4V7F FAQ
1.How can I place an order for BZX84W-B4V7F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84W-B4V7F 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-B4V7F reliable?
The price and inventory of BZX84W-B4V7F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84W-B4V7F is usually 5 days.
3.What payment methods are accepted for BZX84W-B4V7F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84W-B4V7F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84W-B4V7F?
BZX84W-B4V7F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84W-B4V7F 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-B4V7F?
For technical support, including BZX84W-B4V7F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84W-B4V7F requirements.
6.How does Aetrix verify that BZX84W-B4V7F is sourced from the original manufacturer or authorized distributors?
All BZX84W-B4V7F 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-B4V7F meets industry standards.
7.What is the process for return or replacement of BZX84W-B4V7F?
All BZX84W-B4V7F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84W-B4V7F, 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-B4V7F part is unused and in its original packaging.
Return procedure for BZX84W-B4V7F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84W-B4V7F 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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