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Diodes Incorporated BZX84C4V3W-7
- Part No.:
- BZX84C4V3W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84C4V3W-7.pdf
- Description:
- DIODE ZENER 4.3V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:9,322
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Product details
Overview
BZX84C4V3W-7 from Diodes Incorporated is a 4.3 V, 200 mW surface-mount Zener diode in SOT-323 package, with ±0.3 V zener voltage tolerance at 5 mA test current, 90 Ω maximum zener impedance at 5 mA, and 3.0 µA maximum reverse leakage at 1.0 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the BZX84C4V3W-7 datasheet, BZX84C4V3W-7 pinout, BZX84C4V3W-7 application, or BZX84C4V3W-7 equivalent, key selection criteria include nominal zener voltage (4.3 V), power dissipation (200 mW), thermal resistance (625 K/W), reverse leakage (≤3.0 µA @ VR = 1.0 V), and SOT-323 mechanical compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its planar die construction ensures consistent breakdown characteristics and low temperature coefficient (–3.5 to 0 mV/°C) over the –65°C to +125°C operating range.
The device exhibits 90 Ω dynamic impedance at IZT = 5 mA and 600 Ω at IZK = 1.0 mA, enabling predictable clamping behavior in both normal and knee-region operation. Its ultra-small SOT-323 footprint supports space-constrained designs without compromising thermal derating performance on FR4 boards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal, 4.0–4.6 V min/max at IZT = 5 mA - defines regulated output voltage under standard test conditions |
| Power Dissipation (PD) | 200 mW - maximum continuous power handling on FR4 board with recommended pad layout |
| Zener Impedance (ZZT) | 90 Ω max at IZT = 5 mA - indicates voltage stability under small-signal AC variations |
| Reverse Leakage (IR) | 3.0 µA max at VR = 1.0 V - determines quiescent current loss in standby voltage-reference applications |
| Thermal Resistance (RθJA) | 625 K/W - quantifies junction-to-ambient temperature rise per watt, critical for thermal design margin |
| Operating Temperature | –65°C to +125°C - enables use in industrial and automotive ambient environments |
Pinout & Package
Package: SOT-323 - ultra-small surface-mount plastic case (2.0 × 1.25 × 0.9 mm), RoHS-compliant, matte tin-plated terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference | Connected to lower-potential node in reverse-biased Zener configuration; polarity must match schematic symbol orientation |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference node | Connected to higher-potential node; provides stable 4.3 V reference when reverse biased above breakdown threshold |
| Case / Pin 3 | No internal connection | Non-functional thermal pad; electrically isolated - no circuit connection required |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight VZ distribution and repeatable breakdown characteristics across production lots |
| Green molding compound | Halogen-free, UL 94V-0 rated encapsulation compliant with environmental directives |
| SOT-323 footprint | Enables high-density placement in portable and space-constrained PCBs without sacrificing thermal performance |
| Lead-free plating | Matte tin finish annealed over Alloy 42 leadframe meets RoHS and JEDEC J-STD-020D solderability requirements |
Applications
| Portable Power Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Monitoring battery voltage in handheld medical devices with microamp-level sleep current budgets. IC Role / Device Role / Timing Role: Zener diode acts as a low-current voltage reference for ADC input scaling and comparator threshold setting. Use Value: 3.0 µA max reverse leakage at 1.0 V ensures minimal battery drain during extended standby periods. | Use Scenario: Providing stable bias voltage for bridge-based pressure transducers in factory automation systems. IC Role / Device Role / Timing Role: Functions as a shunt regulator to supply clean excitation voltage to sensor Wheatstone bridges. Use Value: 90 Ω zener impedance maintains <±10 mV regulation error across 1–5 mA load variation. |
| USB-C Port Overvoltage Protection | Automotive Body Control Module Clamping |
Use Scenario: Clamping transient surges on USB-C VBUS lines during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage spikes to ≤4.6 V to protect downstream 3.3 V logic. Use Value: 4.3 V nominal breakdown with 0.3 V tolerance ensures reliable clamping before damage threshold of protected ICs. | Use Scenario: Suppressing inductive kickback from 12 V solenoid drivers in vehicle door lock modules. IC Role / Device Role / Timing Role: Zener diode placed across coil to absorb stored energy and limit flyback voltage to safe levels. Use Value: 200 mW power rating sustains repetitive 100 ms pulses at 100 Hz without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5229BS-7-F | Same 4.3 V nominal, but 350 mW PD and SOT-23 package; 100 Ω ZZT at 20 mA | Higher power handling suits higher-current bias networks; larger footprint requires layout revision | Select when >200 mW dissipation or higher IZT stability is required |
| BZX84-C4V3,115 | Identical electrical specs, but in SOT-23 package and Nexperia marking; same 200 mW rating | Same functional performance but different mechanical footprint and reel packaging (3,000 vs. 10,000 pcs/reel) | Choose for multi-source procurement or existing SOT-23 footprint compatibility |
Compared with MMBZ5229BS-7-F and BZX84-C4V3,115, the BZX84C4V3W-7 offers optimal balance of ultra-compact SOT-323 size, verified 200 mW capability, and industry-standard marking (KRH), making it preferred for miniaturized, cost-sensitive consumer electronics where board space is constrained.
Availability
BZX84C4V3W-7 is available at Aetrix Electronics and suitable for portable power monitoring, industrial sensor signal conditioning, USB-C port overvoltage protection, and automotive body control module clamping requiring stable component supply and long-term lifecycle support.
Supply support for BZX84C4V3W-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The BZX84 series belongs to Diodes' general-purpose Zener diode product line, engineered for precision voltage reference and overvoltage protection in space-constrained, cost-sensitive applications across consumer, industrial, and computing markets.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX84C4V3W-7 has a nominal zener voltage of 4.3 V with a guaranteed breakdown range of 4.0 V to 4.6 V at 5 mA test current. Below 4.0 V, it remains in high-impedance reverse blocking mode with ≤3.0 µA leakage at 1.0 V. Breakdown is not abrupt but follows the typical Zener IV curve shown in Figure 2 of DS30066.
Is this part suitable for use in automotive under-hood applications?
Yes - the BZX84C4V3W-7 is rated for –65°C to +125°C operating temperature and qualified to J-STD-020D moisture sensitivity level 1. Its green molding compound and lead-free plating meet AEC-Q200 stress test recommendations for passive components, though formal AEC qualification is not claimed per datasheet.
How does the SOT-323 package affect thermal performance compared to SOT-23?
The SOT-323 package has higher thermal resistance (625 K/W vs. ~350 K/W for SOT-23 on identical FR4 layout), due to smaller copper pad area and reduced thermal mass. This limits continuous power dissipation to 200 mW unless board-level thermal relief (e.g., thermal vias, copper pours) is added per Diodes' AP02001 layout guidelines.
Can this Zener diode be used in forward-bias applications?
Yes - its forward voltage is specified as 0.9 V at 10 mA, matching standard silicon diode behavior. However, it is optimized for reverse-bias regulation; forward conduction is only characterized for polarity verification and ESD protection contexts, not as a rectifier or signal clamp.
BZX84C4V3W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±7%
- Power - Max:
- 200 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BZX84C4V3W-7 FAQ
1.How can I place an order for BZX84C4V3W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C4V3W-7 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 BZX84C4V3W-7 reliable?
The price and inventory of BZX84C4V3W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C4V3W-7 is usually 5 days.
3.What payment methods are accepted for BZX84C4V3W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C4V3W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C4V3W-7?
BZX84C4V3W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C4V3W-7 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 BZX84C4V3W-7?
For technical support, including BZX84C4V3W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C4V3W-7 requirements.
6.How does Aetrix verify that BZX84C4V3W-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C4V3W-7 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 BZX84C4V3W-7 meets industry standards.
7.What is the process for return or replacement of BZX84C4V3W-7?
All BZX84C4V3W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C4V3W-7, 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 BZX84C4V3W-7 part is unused and in its original packaging.
Return procedure for BZX84C4V3W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C4V3W-7 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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