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Diodes Incorporated BZX84C3V9Q-7-F
- Part No.:
- BZX84C3V9Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84C3V9Q-7-F.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
BZX84C3V9Q-7-F from Diodes Incorporated is an automotive-grade 3.9 V, 5 mA Zener diode in SOT23 package, rated for 350 mW power dissipation and qualified to AEC-Q101. It provides precise voltage regulation in low-power biasing, reference, and overvoltage protection circuits, with ±5% zener voltage tolerance (3.7–4.1 V), 90 Ω dynamic impedance at test current, and −3.5 mV/°C temperature coefficient - deployed in automotive body control modules for sensor reference stabilization.
For engineers reviewing the BZX84C3V9Q-7-F datasheet, BZX84C3V9Q-7-F pinout, BZX84C3V9Q-7-F application, or BZX84C3V9Q-7-F equivalent, key selection criteria include zener voltage accuracy at 5 mA, thermal resistance (357 °C/W), AEC-Q101 qualification status, SOT23 terminal configuration, and reverse leakage (≤3.0 µA at 1.0 V).
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 3.9 V reference across varying load currents (1–20 mA) and ambient temperatures (−65 to +150 °C). Its planar die construction ensures consistent voltage regulation and low noise performance under transient conditions.
The device exhibits a negative temperature coefficient of −3.5 mV/°C, enabling predictable drift compensation in temperature-sensitive analog circuits. Its 90 Ω zener impedance at 5 mA supports stable regulation even with moderate source impedance variations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal (3.7–4.1 V range at IZT = 5 mA); enables accurate low-voltage reference generation in 3.3 V rail systems. |
| Power Dissipation | 350 mW at TA = 25 °C; supports continuous operation in compact SOT23 layouts without forced cooling. |
| Zener Impedance (ZZT) | 90 Ω at 1 kHz, 5 mA; ensures minimal output voltage variation under dynamic load changes. |
| Reverse Leakage (IR) | ≤3.0 µA at VR = 1.0 V; guarantees low standby current in battery-powered monitoring circuits. |
| Temperature Coefficient | −3.5 mV/°C; allows predictable voltage drift modeling for calibration-critical sensor interfaces. |
| Thermal Resistance (RθJA) | 357 °C/W; defines maximum junction temperature rise under standard PCB mounting (no heatsink required). |
Pinout & Package
Package: SOT23 - surface-mount, 3-terminal plastic case with matte tin-plated alloy 42 leadframe; UL 94V-0 rated; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node during normal operation; defines polarity for correct reverse-bias mounting. |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to higher-potential node; carries regulated voltage output when reverse biased above 3.9 V. |
| Collector / Heat Sink (Pin 3) | Common leadframe connection | Internally tied to cathode in this Zener structure; serves as primary thermal path and mechanical anchor on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and infotainment power rails. |
| Green molding compound | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); meets RoHS 3 and automotive environmental compliance. |
| Planar die construction | Ensures tight VZ distribution (±5%) and repeatable zener impedance across production lots. |
| SOT23 tape-and-reel packaging | 3,000 units per reel (Q-7-F suffix); optimized for high-speed pick-and-place assembly in automotive manufacturing. |
Applications
| Automotive Sensor Reference | Low-Power Voltage Clamp |
|---|---|
|
Use Scenario: Stabilizing reference voltage for analog-to-digital converters in cabin temperature sensors. IC Role / Device Role / Timing Role: Zener diode providing 3.9 V precision reference to ADC input stage. Use Value: Maintains ≤1% reference error over −40 to +125 °C due to matched TC and low ZZT. |
Use Scenario: Protecting microcontroller GPIO pins from ESD-induced overvoltage transients. IC Role / Device Role / Timing Role: Shunt clamping device limiting voltage to 3.9 V during fast-rising surges. Use Value: Responds within nanoseconds with <3.0 µA leakage at 1.0 V, minimizing standby power loss. |
| Industrial Current Loop Bias | Consumer Power Supply Feedback |
|
Use Scenario: Generating stable bias for 4–20 mA transmitter circuitry in process automation transmitters. IC Role / Device Role / Timing Role: Zener-based current source reference in two-wire loop design. Use Value: Delivers 350 mW dissipation margin at full loop current, supporting 24 V supply headroom. |
Use Scenario: Providing feedback voltage reference in isolated flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Precision shunt reference for optocoupler-driven feedback path. Use Value: Enables ±2% output regulation accuracy with 90 Ω ZZT and −3.5 mV/°C TC compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BS-7-F | Zener voltage 3.6 V (±5%), 200 mW rating, same SOT23 package. | Lower power handling limits use in >10 mA bias networks; tighter VZ tolerance (±3%) but no AEC-Q101 rating. | Select when cost sensitivity outweighs automotive qualification and 350 mW margin is unnecessary. |
| BZX84-C3V9,115 | Same 3.9 V rating and SOT23 package, but standard (non-automotive) grade; RoHS-compliant but not AEC-Q101 qualified. | Lacks automotive reliability validation; unsuitable for under-hood or safety-critical ECUs. | Acceptable for industrial or consumer designs where AEC-Q101 is not mandated. |
Compared with MMBZ5227BS-7-F and BZX84-C3V9,115, the BZX84C3V9Q-7-F uniquely combines AEC-Q101 qualification, 350 mW dissipation, and −3.5 mV/°C TC - making it the only choice for thermally demanding automotive reference designs requiring long-term stability.
Availability
BZX84C3V9Q-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial 4–20 mA transmitters, and consumer power supply feedback circuits requiring stable component supply, AEC-Q101 compliance, and SOT23 footprint compatibility.
Supply support for BZX84C3V9Q-7-F 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 components for automotive, industrial, and computing markets.
The BZX84 series targets cost-effective, space-constrained voltage regulation needs - designed specifically for automated SMT assembly and automotive-grade reliability in harsh environments.
FAQ
What is the maximum reverse voltage before breakdown for BZX84C3V9Q-7-F?
The nominal zener voltage is 3.9 V at 5 mA test current, with guaranteed range of 3.7–4.1 V. Breakdown occurs sharply above 3.7 V in reverse bias; operation below 1.0 V reverse voltage yields ≤3.0 µA leakage. The device is not rated for forward conduction beyond 0.9 V at 10 mA.
Is BZX84C3V9Q-7-F compatible with lead-free reflow soldering profiles?
Yes - it is fully RoHS 3 compliant with matte tin finish on alloy 42 leadframe, qualified for standard lead-free reflow (J-STD-020 profile), and rated for moisture sensitivity level 1, eliminating bake requirements prior to assembly.
How does the −3.5 mV/°C temperature coefficient affect circuit performance?
This negative coefficient means output voltage decreases by 3.5 mV per degree Celsius rise in junction temperature. In a 3.3 V system with ±40 °C ambient swing, total drift is ~280 mV - requiring compensation in precision references, but acceptable for non-critical biasing or clamping functions.
Can BZX84C3V9Q-7-F replace BZX84C3V6Q-7-F in existing designs?
No - the 3.9 V and 3.6 V variants have different zener voltages, impedance (90 Ω vs. 90 Ω), and temperature coefficients (−3.5 vs. −3.5 mV/°C). Substitution alters reference level by 300 mV, potentially violating ADC input range or clamp threshold specifications.
BZX84C3V9Q-7-F 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:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5.13%
- 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84C3V9Q-7-F FAQ
1.How can I place an order for BZX84C3V9Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C3V9Q-7-F 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 BZX84C3V9Q-7-F reliable?
The price and inventory of BZX84C3V9Q-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84C3V9Q-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C3V9Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C3V9Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C3V9Q-7-F?
BZX84C3V9Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C3V9Q-7-F 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 BZX84C3V9Q-7-F?
For technical support, including BZX84C3V9Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C3V9Q-7-F requirements.
6.How does Aetrix verify that BZX84C3V9Q-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C3V9Q-7-F 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 BZX84C3V9Q-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C3V9Q-7-F?
All BZX84C3V9Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C3V9Q-7-F, 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 BZX84C3V9Q-7-F part is unused and in its original packaging.
Return procedure for BZX84C3V9Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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