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Diodes Incorporated BZX84B4V7-7-F
- Part No.:
- BZX84B4V7-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84B4V7-7-F.pdf
- Description:
- DIODE ZENER 4.7V 300MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,046
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Product details
Overview
BZX84B4V7-7-F from Diodes Incorporated is a precision 4.7 V ±2% tolerance Zener diode in SOT23 package, rated for 350 mW power dissipation at ambient temperature, with 80 Ω dynamic impedance at 5 mA test current and 3.0 µA maximum reverse leakage at 2.0 V, used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX84B4V7-7-F datasheet, BZX84B4V7-7-F pinout, BZX84B4V7-7-F application, or BZX84B4V7-7-F equivalent, key selection criteria include Zener voltage tolerance, 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 4.7 V reference under regulated current conditions. Its ±2% VZ tolerance and low 80 Ω Zener impedance at IZT = 5 mA ensure tight voltage control in feedback loops and sensing circuits.
Designed for surface-mount automated assembly, it features lead-free matte tin plating, halogen/antimony-free "Green" molding compound (UL 94V-0), and moisture sensitivity level 1 per J-STD-020 - enabling high-yield reflow processing without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V nominal, 4.61–4.79 V range at 5 mA - enables precise voltage clamping within ±2% across production lots. |
| Power Dissipation | 350 mW at TA = 25°C - supports continuous operation in compact PCB layouts with adequate copper area. |
| Zener Impedance (ZZT) | 80 Ω at IZT = 5 mA - minimizes output voltage variation under load transients in reference supply rails. |
| Reverse Leakage (IR) | 3.0 µA max at VR = 2.0 V - ensures low quiescent current draw in battery-powered voltage monitor circuits. |
| Thermal Resistance (RθJA) | 357 °C/W - defines safe operating temperature rise on standard FR-4 with recommended pad layout. |
| Temperature Coefficient | +0.2 mV/°C - provides near-zero drift over industrial temperature range (-65°C to +150°C). |
| Package | SOT23 - 3-pin surface-mount footprint compatible with high-speed pick-and-place and reflow soldering. |
Pinout & Package
SOT23 package: 3-terminal plastic case with cathode-marked top-side marking (KZ1), anode connected to pin 1, cathode to pin 2, and pin 3 unused (internal die attach). Dimensions conform to JEDEC TO-236AB standard (L=2.90 mm, W=1.30 mm, H=1.03 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to ground or lower-potential node in reverse-biased Zener configuration. |
| Pin 2 | Cathode | Connected to regulated voltage node; carries Zener current during breakdown operation. |
| Pin 3 | Die Attach / Thermal Pad | Internally connected to cathode; enhances thermal conduction when soldered to copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Reduces need for post-production trimming in precision reference designs. |
| AEC-Q101 qualified | Validated for automotive applications including body control modules and sensor signal conditioning. |
| Lead-free and halogen-free | Meets RoHS 3 (2015/863/EU) and automotive ELV Directive requirements without compromising solderability. |
| Moisture Sensitivity Level 1 | Eliminates baking requirement prior to reflow, reducing manufacturing cycle time and cost. |
Applications
| Automotive Sensor Reference | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Providing stable 4.7 V reference for analog front-end of tire pressure monitoring system (TPMS) sensors. IC Role / Device Role / Timing Role: Voltage reference element in ADC bias network and LDO feedback divider. Use Value: ±2% VZ tolerance and +0.2 mV/°C TC ensure <±10 mV drift over -40°C to +125°C, meeting ASIL-B functional safety margin. |
Use Scenario: Setting output voltage in isolated flyback converter feedback loop via optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision shunt regulator establishing reference point for TL431-like feedback path. Use Value: 80 Ω ZZT minimizes gain error in feedback network, improving output regulation to ±1.5% across line/load variations. |
| Portable Medical Instrument Biasing | IoT Node Voltage Monitoring |
Use Scenario: Generating reference for ECG electrode offset calibration circuit in handheld patient monitor. IC Role / Device Role / Timing Role: Low-current Zener source for op-amp input biasing and offset nulling. Use Value: 3.0 µA IR at 2 V enables microamp-level bias networks, extending battery life beyond 12 months on coin cell. |
Use Scenario: Detecting brown-out condition in NB-IoT modem by comparing supply rail against 4.7 V threshold. IC Role / Device Role / Timing Role: Clamping diode in comparator input stage to define detection hysteresis window. Use Value: Tight 4.61–4.79 V VZ range allows accurate 4.7 V trigger point without external resistor trimming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ4685-7-F | Same 4.7 V nominal, but ±5% tolerance and 100 Ω ZZT; not AEC-Q101 qualified. | Suitable for consumer-grade power supplies where tighter regulation is not required. | Select when cost sensitivity outweighs automotive qualification and precision needs. |
| BZX84-C4V7 | Same SOT23 package and 4.7 V rating, but ±5% tolerance and higher 100 Ω ZZT; no AEC-Q101 or Green compliance. | Applicable in non-automotive industrial controls with relaxed environmental compliance. | Choose only for legacy designs requiring direct drop-in replacement without qualification updates. |
Compared with MMBZ4685-7-F and BZX84-C4V7, BZX84B4V7-7-F delivers superior voltage accuracy, lower impedance, and full automotive reliability certification - making it the preferred choice for safety-critical and high-stability reference applications.
Availability
BZX84B4V7-7-F is available at Aetrix Electronics and suitable for automotive sensor reference, industrial power supply feedback, and portable medical instrument biasing requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX84B4V7-7-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.
BZX84B series belongs to Diodes' precision Zener diode product line, engineered for stable voltage reference in space-constrained, thermally demanding environments with strict regulatory compliance requirements.
FAQ
What is the maximum reverse voltage (VR) before significant leakage occurs?
At VR = 2.0 V, reverse leakage current is guaranteed ≤3.0 µA. Beyond this, leakage rises nonlinearly; operation above 2.0 V is not recommended unless transient clamping is intended. The device enters controlled breakdown only at ≥4.61 V (VZ min), so 2.0 V represents the practical upper limit for non-breakdown biasing.
Can BZX84B4V7-7-F be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficient and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For >350 mW applications, use a single higher-power Zener (e.g., 1N4733A) or active regulation with a transistor-based shunt.
Is the SOT23 pin 3 electrically isolated or connected internally?
Pin 3 is internally connected to the cathode (pin 2) via the die attach paddle. It serves as a thermal and electrical extension of the cathode terminal - not an isolated pad - and must be routed to the same net as pin 2 for proper thermal performance and electrical function.
Does the ±2% tolerance apply across temperature or only at 25°C?
The ±2% tolerance applies strictly at TA = 25°C and IZT = 5 mA. Over temperature, VZ shifts predictably per its +0.2 mV/°C coefficient; total variation from -65°C to +150°C is ±120 mV around nominal 4.7 V, independent of initial tolerance band.
BZX84B4V7-7-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):
- 4.7 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 2 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
BZX84B4V7-7-F FAQ
1.How can I place an order for BZX84B4V7-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84B4V7-7-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 BZX84B4V7-7-F reliable?
The price and inventory of BZX84B4V7-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84B4V7-7-F is usually 5 days.
3.What payment methods are accepted for BZX84B4V7-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84B4V7-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84B4V7-7-F?
BZX84B4V7-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84B4V7-7-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 BZX84B4V7-7-F?
For technical support, including BZX84B4V7-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84B4V7-7-F requirements.
6.How does Aetrix verify that BZX84B4V7-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84B4V7-7-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 BZX84B4V7-7-F meets industry standards.
7.What is the process for return or replacement of BZX84B4V7-7-F?
All BZX84B4V7-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84B4V7-7-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 BZX84B4V7-7-F part is unused and in its original packaging.
Return procedure for BZX84B4V7-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84B4V7-7-F Tags
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