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Diodes Incorporated BZX84C3V9W-7
- Part No.:
- BZX84C3V9W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BZX84C3V9W-7.pdf
- Description:
- DIODE ZENER 3.9V 200MW SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:7,380
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Product details
Overview
BZX84C3V9W-7 from Diodes Incorporated is a 3.9 V, 200 mW surface-mount Zener diode in SOT-323 package, rated for 5 mA test current with 90 Ω dynamic impedance at 1 kHz and ±0.2 V zener voltage tolerance (3.7–4.1 V), used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84C3V9W-7 datasheet, BZX84C3V9W-7 pinout, BZX84C3V9W-7 application, or BZX84C3V9W-7 equivalent, key selection criteria include zener voltage accuracy at 5 mA, low reverse leakage (≤3.0 µA at 1.0 V), thermal resistance (625 K/W), RoHS-compliant matte tin plating, and SOT-323 footprint compatibility with high-density PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. It features planar die construction for consistent parametric performance and is characterized at 25°C with specified zener voltage range, impedance, and temperature coefficient.
The device exhibits a negative temperature coefficient of –3.5 mV/°C at 5 mA, enabling predictable drift behavior in temperature-sensitive references. Its ultra-small SOT-323 package supports automated placement and reflow soldering while limiting thermal dissipation to 200 mW on FR4 boards with recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, 3.7–4.1 V min/max at IZT = 5 mA - defines regulated output voltage window |
| Power Dissipation (PD) | 200 mW - limits continuous power handling on standard FR4 PCBs |
| Zener Impedance (ZZT) | 90 Ω at 1 kHz, 5 mA - determines regulation stiffness under small-signal AC variation |
| Reverse Leakage (IR) | ≤3.0 µA at VR = 1.0 V - ensures minimal quiescent current in standby bias networks |
| Thermal Resistance (RθJA) | 625 K/W - indicates junction-to-ambient heat transfer efficiency without heatsinking |
| Temp. Coefficient (αVZ) | –3.5 mV/°C at 5 mA - enables compensation design for ambient temperature drift |
Pinout & Package
Package: SOT-323 - ultra-compact, three-terminal surface-mount plastic case with lead-free matte tin plating over Alloy 42 leadframe; polarity marked by cathode band on top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference | Connected to lower-potential node in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Provides stable 3.9 V relative to anode when reverse biased above knee voltage |
| Case / Exposed Pad | Non-electrical mechanical termination | No internal connection; serves only as mechanical anchor and thermal path via PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures tight parameter distribution and long-term stability of VZ and ZZT |
| Ultra-small SOT-323 package | Enables <1.0 mm² board area usage per device in space-constrained portable electronics |
| Lead-free/RoHS-compliant finish | Meets global environmental compliance requirements without sacrificing solderability |
| "Green" molding compound | Halogen-free encapsulation material compliant with IPC-4101D/21 and JEDEC J-STD-020D |
Applications
| Portable Power Management | Low-Voltage Reference Circuits |
|---|---|
Use Scenario: Regulating bias voltage for LDO feedback networks in battery-powered wearables. IC Role / Device Role / Timing Role: Zener reference element providing stable 3.9 V reference for error amplifier input. Use Value: Enables ±1% output voltage accuracy despite 2.7–4.2 V Li-ion supply variation. | Use Scenario: Generating precise threshold for comparator hysteresis in sensor interface circuits. IC Role / Device Role / Timing Role: Voltage clamp defining upper trip point in dual-threshold detection. Use Value: Delivers repeatable 3.9 V trigger level with <0.1 V drift over –40°C to +85°C. |
| USB-C Power Delivery Monitoring | Industrial Sensor Signal Conditioning |
Use Scenario: Scaling and clamping CC line voltage during USB PD negotiation. IC Role / Device Role / Timing Role: Overvoltage protection limiter for microcontroller GPIO input. Use Value: Prevents damage from transient spikes up to 5.5 V while maintaining signal integrity below 3.9 V. | Use Scenario: Biasing bridge transducers in 4–20 mA loop-powered pressure sensors. IC Role / Device Role / Timing Role: Stable excitation reference for Wheatstone bridge arms. Use Value: Reduces measurement error to <0.05% FS by minimizing VZ drift with temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BS-7-F | 3.6 V nominal, 225 mW rating, 150 Ω ZZT, SOT-323 package | Lower regulation voltage and higher impedance reduce precision in tight-tolerance references | Select when 3.6 V bias is acceptable and higher power margin is needed |
| BZX84-C3V9,115 | Same 3.9 V spec, but in SOT-23 package with different marking and moisture sensitivity level (MSL3) | SOT-23 footprint requires PCB redesign; MSL3 demands stricter handling vs. MSL1 | Choose only if legacy SOT-23 layout reuse is mandatory and humidity control is available |
Compared with MMBZ5227BS-7-F and BZX84-C3V9,115, the BZX84C3V9W-7 offers tighter VZ tolerance (±0.2 V), lower ZZT (90 Ω), and superior MSL1 reliability-making it optimal for high-accuracy, high-volume surface-mount designs where thermal and parametric stability are critical.
Availability
BZX84C3V9W-7 is available at Aetrix Electronics and suitable for portable power management, low-voltage reference circuits, USB-C power delivery monitoring, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for BZX84C3V9W-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, specializing in high-reliability, cost-optimized components for consumer, industrial, and automotive markets.
The BZX84 series belongs to Diodes' general-purpose Zener diode product line, designed specifically for compact, low-power voltage regulation and reference applications in space-constrained PCB environments.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The BZX84C3V9W-7 has a nominal zener voltage of 3.9 V with guaranteed breakdown between 3.7 V and 4.1 V at 5 mA test current. It is not rated for sustained operation above its specified VZ range; applying >4.1 V continuously exceeds design intent and may cause thermal runaway if power dissipation exceeds 200 mW.
Can this device be used in forward-bias applications like a standard diode?
Yes - the BZX84C3V9W-7 exhibits typical silicon diode forward characteristics: ~0.9 V forward voltage at 10 mA. However, its primary design purpose is reverse-bias zener regulation; forward conduction is secondary and lacks optimized parameters such as fast recovery or low VF grading for rectification use.
Is the SOT-323 package compatible with standard reflow profiles?
Yes - the SOT-323 package is qualified for lead-free reflow per JEDEC J-STD-020D Level 1 moisture sensitivity, supporting peak temperatures up to 260°C. Its matte tin finish ensures reliable wetting during standard Pb-free reflow cycles without voiding or dewetting issues.
How does temperature affect the zener voltage in practical operation?
With a temperature coefficient of –3.5 mV/°C at 5 mA, the BZX84C3V9W-7's zener voltage decreases linearly with rising ambient temperature. For example, at 75°C (ΔT = +50°C), VZ drops by ~175 mV - from 3.90 V to ~3.725 V - a deviation that must be accounted for in precision reference designs.
BZX84C3V9W-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):
- 3.9 V
- Tolerance:
- ±5%
- 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
BZX84C3V9W-7 FAQ
1.How can I place an order for BZX84C3V9W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C3V9W-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 BZX84C3V9W-7 reliable?
The price and inventory of BZX84C3V9W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C3V9W-7 is usually 5 days.
3.What payment methods are accepted for BZX84C3V9W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C3V9W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C3V9W-7?
BZX84C3V9W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C3V9W-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 BZX84C3V9W-7?
For technical support, including BZX84C3V9W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C3V9W-7 requirements.
6.How does Aetrix verify that BZX84C3V9W-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C3V9W-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 BZX84C3V9W-7 meets industry standards.
7.What is the process for return or replacement of BZX84C3V9W-7?
All BZX84C3V9W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C3V9W-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 BZX84C3V9W-7 part is unused and in its original packaging.
Return procedure for BZX84C3V9W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C3V9W-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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Diodes Incorporated
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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