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Diodes Incorporated BZX84C3V9T-7-F
- Part No.:
- BZX84C3V9T-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOT-523
- Datasheet:
-
BZX84C3V9T-7-F.pdf
- Description:
- DIODE ZENER 3.9V 150MW SOT523
- Quantity:
- Payment:
- Shipping:
Inventory:3,958
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Product details
Overview
BZX84C3V9T-7-F from Diodes Incorporated is a 3.9 V, 150 mW surface-mount Zener diode in SOT-523 package, rated for 5 mA test current with 90 Ω dynamic impedance and 3.0 µA reverse leakage at 1.0 V, used for precision voltage reference and overvoltage protection in low-power sensor interfaces and portable power rails.
For engineers reviewing the BZX84C3V9T-7-F datasheet, BZX84C3V9T-7-F pinout, BZX84C3V9T-7-F application, or BZX84C3V9T-7-F equivalent, key selection criteria include zener voltage tolerance (±5.1%), thermal resistance (833 °C/W), RoHS-compliant matte tin plating, and SOT-523 footprint compatibility with space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its planar die construction ensures consistent breakdown characteristics and low temperature coefficient (−3.5 to 0 mV/°C) over −65 °C to +150 °C operating range.
Designed for low-power biasing and clamping, it delivers 3.9 V nominal regulation at 5 mA with tight 3.7–4.1 V min/max spread and supports pulsed operation per short-duration test conditions to minimize self-heating effects.
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 regulated output voltage tolerance for reference circuits |
| Power Dissipation (PD) | 150 mW - maximum continuous power handling on FR-4 board with recommended pad layout |
| Zener Impedance (ZZT) | 90 Ω at 5 mA - indicates voltage stability under small-signal current variation |
| Reverse Leakage (IR) | 3.0 µA at 1.0 V - determines quiescent current draw in standby clamp configurations |
| Thermal Resistance (RθJA) | 833 °C/W - defines junction-to-ambient temperature rise per milliwatt dissipated |
| Operating Temperature | −65 °C to +150 °C - enables use in automotive under-hood and industrial ambient environments |
Pinout & Package
Package: SOT-523 - ultra-small surface-mount plastic case (1.60 mm × 0.80 mm × 0.50 mm), UL 94V-0 rated, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse-biased cathode reference | Connected to lower-potential node in shunt regulator; polarity confirmed by top-view marking "RG" and cathode band |
| Cathode | Zener breakdown terminal / Voltage reference output | Connected to regulated rail; provides stable 3.9 V reference when reverse-biased above breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small SOT-523 footprint | Enables placement in high-density layouts where board space is constrained to <1.3 mm² |
| Planar die construction | Delivers repeatable Zener voltage distribution and improved long-term stability vs. diffused-junction alternatives |
| Lead-free / RoHS-compliant plating | Matte tin finish over Alloy 42 leadframe meets global environmental compliance without solderability compromise |
| Green molding compound | Halogen-free encapsulation (Date Code UO and newer) reduces toxic emissions during PCB rework or disposal |
Applications
| Portable Sensor Biasing | USB Peripheral Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 3.9 V reference for analog front-end of MEMS accelerometers in battery-powered wearables. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining ADC input bias point despite Li-ion battery discharge from 4.2 V to 3.0 V. Use Value: Tight 3.7–4.1 V tolerance ensures <0.5% reference drift across supply range, preserving measurement accuracy. | Use Scenario: Clamping USB data lines (D+/D−) against ESD transients in OTG-enabled Bluetooth headsets. IC Role / Device Role / Timing Role: Low-capacitance (<2 pF) transient suppressor placed directly at connector interface. Use Value: 3.0 µA leakage at 1.0 V prevents signal degradation while 150 mW rating absorbs IEC 61000-4-2 ±8 kV contact discharges. |
| Low-Power MCU Reset Circuit | Industrial 4–20 mA Loop Reference |
Use Scenario: Generating precise reset threshold for ARM Cortex-M0+ microcontrollers in smart meter modules. IC Role / Device Role / Timing Role: Zener-based voltage detector feeding comparator input to trigger POR or brown-out reset. Use Value: −3.5 to 0 mV/°C tempco ensures reset threshold shift remains <15 mV over −40 °C to +85 °C operating range. | Use Scenario: Establishing 3.9 V reference for loop-powered transmitter ICs in hazardous-area pressure transmitters. IC Role / Device Role / Timing Role: Precision shunt regulator supplying bias to op-amps and DACs within 4–20 mA current loop. Use Value: 90 Ω ZZT limits output voltage variation to <0.45 V across 0.5–3 mA loop current changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5227BT-7-F | Same 3.9 V nominal, but 200 mW rating and SOT-23 package; 100 Ω ZZT at 20 mA | Higher power handling suits higher-current bias networks; larger SOT-23 footprint requires layout revision | Select when >150 mW dissipation margin or legacy SOT-23 compatibility is required |
| BZX84-C3V9,115 | Identical electrical specs, but packaged in SOT-23 and supplied by Nexperia; RoHS-compliant, same 3.7–4.1 V range | No footprint change needed if migrating from Nexperia's SOT-23 variant; identical thermal performance not guaranteed due to different mold compound | Choose for dual-sourcing flexibility where SOT-23 is already validated in design |
Compared with MMBZ5227BT-7-F and BZX84-C3V9,115, the BZX84C3V9T-7-F offers optimal space efficiency in SOT-523 while maintaining identical voltage regulation performance-critical for next-generation compact IoT endpoints where board area is premium.
Availability
BZX84C3V9T-7-F is available at Aetrix Electronics and suitable for portable sensor biasing, USB peripheral overvoltage clamping, and low-power MCU reset circuits requiring stable component supply with full traceability and lifecycle management.
Supply support for BZX84C3V9T-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, serving industrial, computing, consumer, and communications markets with high-reliability components.
The BZX84 series belongs to Diodes' standard Zener diode product line, engineered specifically for cost-sensitive, space-constrained voltage regulation and protection in battery-powered and portable electronics.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The BZX84C3V9T-7-F has a nominal Zener voltage of 3.9 V with a guaranteed breakdown range of 3.7 V to 4.1 V at 5 mA test current. It is not rated for reverse blocking beyond its specified Zener range; operation above 4.1 V in reverse bias initiates controlled breakdown and must be current-limited to prevent exceeding 150 mW dissipation.
Does this part meet lead-free and RoHS requirements?
Yes. The BZX84C3V9T-7-F uses matte tin plating over an Alloy 42 leadframe and is fully RoHS-compliant with no intentionally added lead. It also employs halogen-free green molding compound for Date Codes UO (2007 week 40) and newer, satisfying IPC-1752 and EU Directive 2011/65/EU requirements.
Can this Zener diode be used in place of a 3.3 V device?
No. With a nominal 3.9 V Zener voltage and 3.7–4.1 V tolerance range, it cannot substitute for a 3.3 V device without risking overvoltage damage to downstream circuitry. The BZX84C3V3T-7-F (3.3 V, 3.1–3.5 V range) is the correct variant for 3.3 V reference applications.
How does thermal resistance affect real-world performance?
At 833 °C/W, a 100 mW power dissipation raises the junction temperature by ~83 °C above ambient. In a 70 °C ambient environment, junction temperature reaches ~153 °C-exceeding the 150 °C max rating. Derating per Figure 1 is mandatory: at 70 °C ambient, maximum allowable power drops to ~100 mW to ensure safe operation.
BZX84C3V9T-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-523
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 150 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-523
BZX84C3V9T-7-F FAQ
1.How can I place an order for BZX84C3V9T-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84C3V9T-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 BZX84C3V9T-7-F reliable?
The price and inventory of BZX84C3V9T-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 BZX84C3V9T-7-F is usually 5 days.
3.What payment methods are accepted for BZX84C3V9T-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84C3V9T-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84C3V9T-7-F?
BZX84C3V9T-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84C3V9T-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 BZX84C3V9T-7-F?
For technical support, including BZX84C3V9T-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84C3V9T-7-F requirements.
6.How does Aetrix verify that BZX84C3V9T-7-F is sourced from the original manufacturer or authorized distributors?
All BZX84C3V9T-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 BZX84C3V9T-7-F meets industry standards.
7.What is the process for return or replacement of BZX84C3V9T-7-F?
All BZX84C3V9T-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BZX84C3V9T-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 BZX84C3V9T-7-F part is unused and in its original packaging.
Return procedure for BZX84C3V9T-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX84C3V9T-7-F Tags
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