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Diodes Incorporated BZX84C3V9-7
- Part No.:
- BZX84C3V9-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C3V9-7.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,439
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Product details
Overview
BZX84C3V9-7 from Diodes Incorporated is a 3.9 V, 350 mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog and digital circuits. It delivers ±5% tolerance (3.7–4.1 V), 90 Ω dynamic impedance at 5 mA test current, and 3.0 µA maximum reverse leakage at 1.0 V, enabling stable reference generation in battery-powered sensors and power supply feedback loops.
For engineers reviewing the BZX84C3V9-7 datasheet, BZX84C3V9-7 pinout, BZX84C3V9-7 application, or BZX84C3V9-7 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (357 °C/W), RoHS/Green compliance, AEC-Q101 qualification, and SOT23 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal 3.9 V regulation point at 5 mA test current. Its planar die construction ensures stable voltage characteristics across temperature (−65 to +150 °C) and low thermal resistance (357 °C/W under ambient-terminal conditions).
The device exhibits a negative temperature coefficient of −3.5 mV/°C and total capacitance below 100 pF at 1 V reverse bias, making it suitable for low-noise voltage references and transient suppression where minimal parasitic capacitance is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, 3.7–4.1 V range at 5 mA - defines precise regulation threshold for feedback or clamping |
| Power Dissipation | 350 mW - supports continuous operation in compact SOT23 layout without forced cooling |
| Zener Impedance (ZZT) | 90 Ω at 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 3.0 µA max at 1.0 V - enables low-quiescent-current designs in battery monitoring |
| Thermal Resistance (RθJA) | 357 °C/W - allows predictable junction temperature rise on standard FR-4 PCBs |
| Temperature Coefficient | −3.5 mV/°C - quantifies voltage drift with ambient changes for stability-critical references |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic case (UL 94V-0), 0.008 g weight, matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower potential side in reverse-biased regulation configuration |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher potential side; voltage referenced to this node during regulation |
| No-connect / Heat Sink (Pin 3) | Internal die attachment pad | Electrically isolated; provides mechanical anchoring and minor thermal path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Ensures repeatable Zener voltage distribution and long-term parametric stability |
| AEC-Q101 qualification | Validates reliability for automotive electronics including infotainment and body control modules |
| Halogen- and antimony-free "Green" molding compound | Meets strict environmental compliance (Br+Cl <1500 ppm, Sb <1000 ppm) without compromising moisture resistance |
| Lead-free and RoHS 3 compliant | Enables direct use in consumer, industrial, and medical products requiring full EU regulatory alignment |
Applications
| Power Supply Feedback Reference | Battery Voltage Monitor |
|---|---|
|
Use Scenario: Regulating output voltage in low-cost linear regulators or switching converter feedback networks. IC Role / Device Role / Timing Role: Provides stable 3.9 V reference for error amplifier input in TL431-based or discrete op-amp feedback paths. Use Value: Tight 3.7–4.1 V tolerance and 90 Ω impedance maintain ±1% output regulation across line/load variations. |
Use Scenario: Detecting low battery condition in portable devices using comparator threshold setting. IC Role / Device Role / Timing Role: Acts as precision voltage clamp defining trip point for microcontroller ADC or comparator input. Use Value: 3.0 µA max reverse leakage preserves battery life; −3.5 mV/°C TC enables temperature-compensated cutoff thresholds. |
| ESD Protection Clamp | Signal Level Shifter |
|
Use Scenario: Protecting I/O pins of microcontrollers and sensors against electrostatic discharge events. IC Role / Device Role / Timing Role: Functions as bidirectional transient voltage suppressor between signal line and ground or rail. Use Value: Low 100 pF capacitance avoids signal integrity degradation on lines up to 10 MHz; 350 mW rating handles IEC 61000-4-2 contact discharge. |
Use Scenario: Translating logic levels between 5 V and 3.3 V domains in mixed-voltage interface circuits. IC Role / Device Role / Timing Role: Used in series with pull-up resistor to generate 3.9 V intermediate bias point for open-drain translators. Use Value: Stable 3.9 V breakdown enables predictable high-state voltage translation without active circuitry or power consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BS-7-F | 3.6 V nominal, ±5%, 200 mW rating, same SOT23 package | Lower power and voltage - suited for ultra-low-power sensor biasing but not 3.9 V feedback | Select when 3.6 V regulation suffices and thermal budget is constrained |
| BZX84-C3V9,115 | Identical electrical specs, same SOT23, Nexperia packaging (10,000/reel) | No functional difference; differs only in tape-and-reel quantity and manufacturer logistics | Choose for multi-source procurement or volume pricing flexibility |
Compared with MMBZ5227BS-7-F, BZX84C3V9-7 offers higher regulation voltage and 75% more power handling; versus BZX84-C3V9,115, it shares identical performance but differs in packaging format and supply chain origin-enabling dual-sourcing without design change.
Availability
BZX84C3V9-7 is available at Aetrix Electronics and suitable for power supply feedback reference, battery voltage monitor, ESD protection clamp, and signal level shifter applications requiring stable component supply and automotive-grade reliability.
Supply support for BZX84C3V9-7 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with emphasis on high-reliability, energy-efficient components for industrial and automotive markets.
The BZX84C series belongs to Diodes' precision Zener diode product line, engineered for stable voltage reference and protection in space-constrained, thermally demanding environments such as automotive ECUs and IoT edge nodes.
FAQ
What is the maximum reverse voltage (VR) before significant leakage occurs?
The datasheet specifies a maximum reverse current (IR) of 3.0 µA at VR = 1.0 V. At 3.0 V reverse bias, leakage remains below 10 µA - well within typical low-power design limits. Exceeding 3.9 V initiates controlled Zener breakdown, not uncontrolled conduction.
Is BZX84C3V9-7 suitable for automotive applications?
Yes - it is qualified to AEC-Q101 standards, features halogen/antimony-free "Green" construction, and operates across −65°C to +150°C. Its SOT23 package and 350 mW rating meet requirements for under-hood and cabin electronics including lighting controllers and sensor interfaces.
How does thermal resistance affect real-world power handling?
With RθJA = 357 °C/W, dissipating 350 mW raises junction temperature by ~125°C above ambient. On a standard FR-4 board, this limits continuous operation to ≤25°C ambient unless derated per Figure 1 - e.g., 200 mW at 70°C ambient.
Can this Zener be used in AC signal clipping applications?
Yes - its symmetric forward voltage (~0.9 V) and sharp 3.9 V reverse breakdown enable bidirectional clipping. Total capacitance <100 pF minimizes high-frequency distortion, making it viable for audio and sensor signal conditioning up to ~1 MHz.
BZX84C3V9-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 300 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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C3V9-7 FAQ
1.How can I place an order for BZX84C3V9-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C3V9-7 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 BZX84C3V9-7 reliable?
The price and inventory of BZX84C3V9-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C3V9-7 is usually 5 days.
3.What payment methods are accepted for BZX84C3V9-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C3V9-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C3V9-7?
BZX84C3V9-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C3V9-7 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 BZX84C3V9-7?
For technical support, including BZX84C3V9-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C3V9-7 requirements.
6.How does Aetrix verify that BZX84C3V9-7 is sourced from the original manufacturer or authorized distributors?
All BZX84C3V9-7 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 BZX84C3V9-7 meets industry standards.
7.What is the process for return or replacement of BZX84C3V9-7?
All BZX84C3V9-7 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C3V9-7, 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 BZX84C3V9-7 part is unused and in its original packaging.
Return procedure for BZX84C3V9-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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