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Diodes Incorporated BZX84B3V9-7-F
- Part No.:
- BZX84B3V9-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B3V9-7-F.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,203
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Product details
Overview
BZX84B3V9-7-F from Diodes Incorporated is a precision 3.9 V ±2% tolerance Zener diode in SOT23 package, rated for 350 mW power dissipation at ambient temperature, with 90 Ω maximum Zener impedance at 5 mA test current and 3.0 µA maximum reverse leakage at 1.0 V, widely used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84B3V9-7-F datasheet, BZX84B3V9-7-F pinout, BZX84B3V9-7-F application, or BZX84B3V9-7-F equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (357 °C/W), junction-to-ambient derating behavior, and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load and supply conditions. Its 3.9 V nominal Zener voltage is specified at 5 mA test current, with tight ±2% initial tolerance and low 90 Ω dynamic impedance ensuring minimal output variation during transient current changes.
The device exhibits a negative temperature coefficient of –3.5 mV/°C near 3.9 V, enabling predictable drift compensation in reference designs. It is qualified to AEC-Q101 standards and features halogen- and antimony-free "Green" packaging compliant with RoHS 3 (2015/863/EU).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V nominal, 3.82–3.98 V range at 5 mA - ensures precise voltage clamping in biasing and reference circuits |
| Tolerance | ±2% - enables high-accuracy regulation without post-production trimming |
| Power Dissipation | 350 mW at TA = 25°C - supports continuous operation in compact PCB layouts with adequate copper area |
| Zener Impedance (ZZT) | 90 Ω max at 1 kHz, 5 mA - minimizes AC ripple coupling into regulated nodes |
| Reverse Leakage (IR) | 3.0 µA max at 1.0 V - reduces standby current in battery-powered sensing interfaces |
| Thermal Resistance (RθJA) | 357 °C/W - defines safe operating area under natural convection on FR-4 with standard pad layout |
| Temperature Coefficient | –3.5 mV/°C - allows predictable thermal drift modeling in temperature-sensitive references |
Pinout & Package
Package: SOT23 - surface-mount plastic case with matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1, UL 94V-0 flammability rating, weight ≈ 0.008 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to circuit ground when used as shunt regulator; determines polarity in reverse-bias configuration |
| Cathode (Pin 2) | Zener breakdown terminal / regulated output node | Provides stable 3.9 V reference relative to anode; carries full load current in shunt topology |
| No-Connect (Pin 3) | Non-functional lead / mechanical support | Internally unconnected; serves structural role in SOT23 molding; must remain floating |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct use in precision 3.3 V/3.9 V rail monitoring without calibration |
| AEC-Q101 qualification | Validates reliability for automotive body electronics, infotainment power supplies, and ADAS sensor biasing |
| SOT23 footprint compatibility | Supports automated pick-and-place assembly and reflow soldering per J-STD-020 Level 1 |
| Halogen- and antimony-free "Green" construction | Meets IEC 61249-2-21 and JEDEC JS709E environmental compliance requirements |
| 350 mW power rating at ambient | Permits use in space-constrained industrial IoT nodes where heatsinking is impractical |
Applications
| Industrial Sensor Signal Conditioning | Automotive Cabin Control Module |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature/humidity transmitters. IC Role / Device Role: Shunt voltage reference providing 3.9 V bias to op-amp input stage and ADC reference divider. Use Value: ±2% tolerance and 90 Ω ZZT limit measurement error to <0.1% FS over 0–70°C ambient range. |
Use Scenario: Regulating 3.3 V logic supply for microcontroller I/O buffers in HVAC control panels. IC Role / Device Role: Low-power Zener clamp protecting MCU GPIO from 5 V bus transients. Use Value: 3.0 µA IR at 1.0 V ensures <1 µA standby drain on 3.3 V rail during sleep mode. |
| Medical Wearable Battery Monitor | Smart Home Smoke Detector |
|
Use Scenario: Generating stable threshold voltage for Li-ion cell voltage comparator in fitness trackers. IC Role / Device Role: Precision voltage reference for window comparator detecting 3.0–4.2 V battery range. Use Value: –3.5 mV/°C TC enables software-compensated SOC estimation with <2% error across –10 to +50°C. |
Use Scenario: Providing regulated bias to electrochemical CO sensor amplifier in battery-operated detectors. IC Role / Device Role: Low-drift Zener reference for transimpedance amplifier gain-setting network. Use Value: 357 °C/W RθJA allows continuous operation at 85°C ambient without derating in sealed enclosure. |
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 | 3.6 V nominal, ±5% tolerance, 300 mW rating, 150 Ω ZZT | Higher voltage drift and looser tolerance reduce accuracy in precision references | Select only when cost sensitivity outweighs regulation stability requirements |
| BZX84-C3V9,115 | 3.9 V nominal, ±5% tolerance, same SOT23 package, non-AEC-Q101 | Lacks automotive qualification and tighter tolerance; suitable for consumer-grade products only | Prefer for non-automotive applications where AEC-Q101 is not mandated |
Compared with MMBZ5227BS-7-F and BZX84-C3V9,115, BZX84B3V9-7-F delivers superior voltage accuracy (±2% vs. ±5%), lower dynamic impedance (90 Ω vs. ≥150 Ω), and AEC-Q101 qualification-making it the optimal choice for automotive and industrial reference designs demanding long-term stability.
Availability
BZX84B3V9-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive cabin control modules, medical wearable battery monitors, and smart home smoke detectors requiring stable component supply and automotive-grade reliability.
Supply support for BZX84B3V9-7-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 consumer markets with ISO/TS 16949 and ISO 14001 certification.
BZX84B series belongs to Diodes' precision Zener diode product line, engineered specifically for voltage reference and regulation in space-constrained, thermally demanding applications requiring AEC-Q101 compliance and tight parametric control.
FAQ
What is the maximum steady-state power dissipation for BZX84B3V9-7-F?
The device is rated for 350 mW power dissipation when terminals are maintained at ambient temperature (Note 6). Derating begins above 25°C ambient, reaching 0 mW at 150°C per the Figure 1 power derating curve. Operation beyond this limit risks irreversible junction damage.
Is BZX84B3V9-7-F suitable for automotive applications?
Yes-it is explicitly qualified to AEC-Q101 standards, with full traceability, lot-level testing, and process controls validated for automotive under-hood and cabin environments. The "Q" suffix denotes automotive grade; this part uses the standard "-7-F" tape-and-reel packaging but retains full AEC-Q101 compliance.
How does the Zener impedance affect circuit performance?
With a maximum ZZT of 90 Ω at 5 mA, the diode introduces minimal AC impedance in shunt regulation paths. This limits output voltage variation to <0.45 mV per 5 µA ripple current, critical for noise-sensitive analog front-ends and precision ADC references.
What is the polarity marking convention for SOT23 Zener diodes?
The cathode is marked by a band adjacent to Pin 2. In top view, Pin 1 (anode) is bottom-left, Pin 2 (cathode) is bottom-right, and Pin 3 (NC) is top-center. Polarity must be verified using the schematic diagram in DS36159 Rev. 3, page 1.
BZX84B3V9-7-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:
- ±2%
- 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
BZX84B3V9-7-F FAQ
1.How can I place an order for BZX84B3V9-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B3V9-7-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 BZX84B3V9-7-F reliable?
The price and inventory of BZX84B3V9-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B3V9-7-F is usually 5 days.
3.What payment methods are accepted for BZX84B3V9-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B3V9-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B3V9-7-F?
BZX84B3V9-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B3V9-7-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 BZX84B3V9-7-F?
For technical support, including BZX84B3V9-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B3V9-7-F requirements.
6.How does Aetrix verify that BZX84B3V9-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84B3V9-7-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 BZX84B3V9-7-F meets industry standards.
7.What is the process for return or replacement of BZX84B3V9-7-F?
All BZX84B3V9-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B3V9-7-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 BZX84B3V9-7-F part is unused and in its original packaging.
Return procedure for BZX84B3V9-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B3V9-7-F Tags
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