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Diodes Incorporated BZX84B4V3Q-7-F
- Part No.:
- BZX84B4V3Q-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B4V3Q-7-F.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,827
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Product details
Overview
BZX84B4V3Q-7-F from Diodes Incorporated is an AEC-Q101-qualified surface-mount precision Zener diode with nominal 4.3 V zener voltage (±2% tolerance), 350 mW power dissipation, and 90 Ω dynamic impedance at 5 mA test current. It operates across –65 °C to +150 °C and is used for voltage regulation and reference in automotive power supply monitoring circuits.
For engineers reviewing the BZX84B4V3Q-7-F datasheet, BZX84B4V3Q-7-F pinout, BZX84B4V3Q-7-F application, or BZX84B4V3Q-7-F equivalent, key selection criteria include its ±2% VZ tolerance, low 90 Ω ZZT, automotive qualification, SOT23 package compatibility, and 3.0 µA maximum reverse leakage at 1.0 V.
Technical Context
This Zener diode delivers stable voltage reference performance under regulated reverse-bias conditions, with a nominal breakdown voltage of 4.3 V at 5 mA (IZT). Its temperature coefficient is –3.5 mV/°C below 6 V, ensuring predictable drift in automotive ambient ranges.
The device uses alloy-42 leadframe with matte tin plating and meets J-STD-020 moisture sensitivity Level 1. Thermal resistance is 357 °C/W (junction-to-ambient, terminals held at ambient), enabling reliable operation without forced cooling in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.3 V nominal, 4.21–4.39 V range at 5 mA - enables precise 4.3 V rail clamping or reference generation |
| Tolerance | ±2% - supports tight-regulation applications without post-calibration |
| Power Dissipation | 350 mW - sufficient for low-power biasing and protection in signal conditioning stages |
| Zener Impedance (ZZT) | 90 Ω at 1 kHz, 5 mA - ensures minimal output voltage variation under load transients |
| Reverse Leakage (IR) | 3.0 µA max at 1.0 V - reduces quiescent current in always-on monitoring circuits |
| Operating Temp Range | –65 °C to +150 °C - validated for under-hood automotive environments |
| Thermal Resistance (RθJA) | 357 °C/W - allows direct thermal design on standard FR-4 with recommended pad layout |
Pinout & Package
Package: SOT23 - surface-mount plastic case with 0.008 g mass, UL 94V-0 flammability rating, and lead-free matte tin plating over alloy-42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal / cathode reference ground | Connected to system ground or lower-potential node during Zener operation |
| Cathode (Pin 2) | Zener breakdown terminal / voltage reference output | Provides stabilized 4.3 V relative to anode when reverse biased above VZ |
| Collector / NC (Pin 3) | Internal die attachment / mechanical support | Electrically isolated; serves as heatsink path and mechanical anchor in SOT23 mold |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress-test requirements including HTOL, TCT, and ESD |
| ±2% VZ tolerance | Reduces binning complexity and eliminates need for external trimming in reference designs |
| Green compound packaging | Halogen- and antimony-free molding compound (<900 ppm Br+Cl, <1000 ppm Sb) compliant with RoHS 3 |
| SOT23 footprint | Enables high-density placement and compatibility with automated pick-and-place and reflow processes |
| Low 3.0 µA IR at 1.0 V | Minimizes standby current draw in battery-backed or always-on sensor interface circuits |
Applications
| Automotive Engine Control Unit (ECU) Power Monitoring | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Monitoring 5 V microcontroller supply rail for undervoltage detection in engine control modules. IC Role / Device Role / Timing Role: Precision voltage reference for comparator input in reset supervisor circuitry. Use Value: ±2% VZ tolerance ensures accurate trip point at 4.3 V, reducing false resets during cold cranking transients. |
Use Scenario: Providing stable bias voltage for analog front-end amplifiers in 4–20 mA loop-powered sensors. IC Role / Device Role / Timing Role: Low-drift Zener reference replacing higher-cost shunt regulators in isolated signal chains. Use Value: –3.5 mV/°C tempco and 90 Ω ZZT maintain reference stability across –40 °C to +85 °C industrial operating range. |
| Consumer IoT Battery Voltage Supervision | Medical Diagnostic Equipment Reference |
Use Scenario: Detecting end-of-charge or low-battery condition in lithium-ion powered wearables. IC Role / Device Role / Timing Role: Reverse-biased Zener in ADC input divider network for battery voltage scaling. Use Value: 3.0 µA IR at 1.0 V minimizes loading error and extends battery life in ultra-low-power sleep modes. |
Use Scenario: Generating calibrated reference for analog-to-digital conversion in portable ECG signal acquisition. IC Role / Device Role / Timing Role: Primary voltage reference for precision 16-bit SAR ADC reference buffer stage. Use Value: AEC-Q101 qualification provides reliability assurance for safety-critical medical subsystems requiring long-term parametric stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84C4V3-7-F | ±5% VZ tolerance, same SOT23 package and 350 mW rating | Acceptable where cost sensitivity outweighs precision requirement | Select when ±5% regulation is sufficient and automotive qualification is not required |
| MMSZ4V3T1G | ±5% VZ, 500 mW rating, same SOT23, no AEC-Q101 qualification | Higher power margin but unqualified for automotive use | Prefer for industrial non-automotive designs needing extra derating headroom |
Compared with BZX84C4V3-7-F and MMSZ4V3T1G, BZX84B4V3Q-7-F uniquely combines ±2% tolerance and AEC-Q101 qualification-critical for automotive voltage supervision where both accuracy and reliability are mandated.
Availability
BZX84B4V3Q-7-F is available at Aetrix Electronics and suitable for automotive power monitoring, industrial sensor biasing, consumer IoT battery supervision, and medical diagnostic reference applications requiring stable component supply and full traceability.
Supply support for BZX84B4V3Q-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The BZX84 series belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability voltage regulation and reference in automotive, industrial, and medical systems where tight tolerance and environmental robustness are essential.
FAQ
What is the maximum reverse voltage (VR) before significant leakage occurs?
The BZX84B4V3Q-7-F exhibits ≤3.0 µA reverse current at 1.0 V applied reverse bias, per datasheet Note 7. At 4.0 V (just below VZ), leakage remains ≤10 µA - well within typical design margins for reference and clamp applications.
Is this part suitable for use in a 12 V automotive system's 5 V LDO feedback network?
Yes - its 4.3 V zener voltage is commonly used in resistor-divider networks to set LDO output. The ±2% tolerance ensures accurate 5 V regulation, and AEC-Q101 qualification guarantees operation across the full automotive temperature range (–40 °C to +125 °C).
How does the –3.5 mV/°C temperature coefficient affect long-term reference stability?
Over a 100 °C range (–40 °C to +60 °C), the coefficient causes ~350 mV total drift - but since it's linear and predictable, it can be compensated in firmware or trimmed in calibration. For non-critical references, it introduces <±0.5% error relative to nominal 4.3 V.
Can BZX84B4V3Q-7-F replace BZX84B4V3-7-F in existing designs?
Yes - the "Q" suffix denotes AEC-Q101 qualification; all electrical, thermal, and mechanical specifications match BZX84B4V3-7-F. No layout or schematic changes are needed, and the Q-version adds automotive reliability without trade-offs in performance or footprint.
BZX84B4V3Q-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):
- 4.3 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 (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BZX84B4V3Q-7-F FAQ
1.How can I place an order for BZX84B4V3Q-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B4V3Q-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 BZX84B4V3Q-7-F reliable?
The price and inventory of BZX84B4V3Q-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 BZX84B4V3Q-7-F is usually 5 days.
3.What payment methods are accepted for BZX84B4V3Q-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B4V3Q-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B4V3Q-7-F?
BZX84B4V3Q-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B4V3Q-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 BZX84B4V3Q-7-F?
For technical support, including BZX84B4V3Q-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B4V3Q-7-F requirements.
6.How does Aetrix verify that BZX84B4V3Q-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84B4V3Q-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 BZX84B4V3Q-7-F meets industry standards.
7.What is the process for return or replacement of BZX84B4V3Q-7-F?
All BZX84B4V3Q-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B4V3Q-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 BZX84B4V3Q-7-F part is unused and in its original packaging.
Return procedure for BZX84B4V3Q-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B4V3Q-7-F Tags
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Diodes Incorporated
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Diodes Incorporated
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MMSZ5231B-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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