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Nexperia USA Inc. BZX84-B3V9/DG/B3,2
- Part No.:
- BZX84-B3V9/DG/B3,2
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-B3V9/DG/B3,2.pdf
- Description:
- DIODE ZENER 3.9V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,083
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Product details
Overview
BZX84-B3V9/DG/B3,2 from Nexperia is a 3.9 V Zener diode in SOT23 package with ±2% tolerance, 500 mW power dissipation, and 5 µA maximum leakage current at 1 V reverse bias. It provides precise voltage regulation in low-power supply rails and reference circuits for sensor signal conditioning and microcontroller I/O protection.
For engineers reviewing the BZX84-B3V9/DG/B3,2 datasheet, BZX84-B3V9/DG/B3,2 pinout, BZX84-B3V9/DG/B3,2 application, or BZX84-B3V9/DG/B3,2 equivalent, key selection criteria include Zener voltage accuracy, temperature coefficient (−2.5 mV/K), dynamic impedance (90 Ω at 5 mA), and SOT23 thermal resistance (375 K/W) for stable operation in space-constrained PCB layouts.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 3.9 V reference across load variations. Its tight ±2% tolerance and low −2.5 mV/K temperature coefficient ensure minimal drift over −65 °C to +150 °C ambient range.
The device supports continuous DC operation up to 500 mW and exhibits 90 Ω dynamic impedance at 5 mA test current, enabling effective noise suppression in analog feedback paths and precision biasing networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 3.9 V ±2% - Enables accurate 3.3 V rail clamping when used with series resistor in LDO bypass or MCU reset circuitry. |
| Power Dissipation | 500 mW - Supports sustained regulation in low-current (<100 mA) auxiliary supplies without heatsinking. |
| Dynamic Impedance | 90 Ω at 5 mA - Limits output voltage variation to <0.45 V under ±5 mA load step, critical for ADC reference stability. |
| Leakage Current | ≤5 µA at 1 V - Ensures negligible quiescent current draw in battery-powered sensor nodes during sleep mode. |
| Temp Coefficient | −2.5 mV/K - Predictable voltage shift of −0.39 V over 155 °C range, allowing linear compensation in industrial temperature monitoring. |
| Package | SOT23 - Compatible with standard pick-and-place equipment and achieves 375 K/W junction-to-ambient thermal resistance on 2-layer FR4. |
Pinout & Package
Package: SOT23 (3-pin, plastic surface-mount). Cathode marked by band; Anode and cathode terminals only - no third functional pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reverse-bias current return path | Connected to ground or lower-potential node to enable Zener conduction during overvoltage events. |
| Cathode (Pin 2) | Regulated output node | Provides stable 3.9 V reference when reverse-biased; must be decoupled with ≥100 nF ceramic capacitor for noise immunity. |
| Pin 3 (NC) | No connection | Internally unconnected; left floating per datasheet - no PCB trace or solder mask required. |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±2% ensures 3.82–3.98 V regulation window, reducing need for post-production calibration in medical sensor front-ends. |
| Low leakage current | ≤5 µA at 1 V enables >10-year battery life in wireless IoT endpoint designs operating at 1 µA sleep current. |
| High temperature rating | Rated for −65 °C to +150 °C operation, supporting under-hood automotive modules and industrial motor drive control boards. |
| SOT23 footprint compatibility | Matches JEDEC TO-236AB outline, allowing drop-in replacement of BZX84-C3V9 and MMBZ5226B in existing layouts. |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller I/O Protection |
|---|---|
Use Scenario: Stabilizing excitation voltage for 4–20 mA current-loop pressure transmitters operating in factory-floor environments. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference for op-amp-based current source circuitry. Use Value: ±2% tolerance maintains transmitter full-scale accuracy within 0.5% error band across temperature cycling. | Use Scenario: Clamping GPIO pins of ARM Cortex-M0+ MCUs against ESD-induced overvoltage during field deployment. IC Role / Device Role / Timing Role: Low-leakage shunt protector limiting pin voltage to 3.9 V during 8 kV HBM discharge events. Use Value: 5 µA leakage avoids false wake-up triggers while 90 Ω impedance limits clamp voltage overshoot to <4.2 V. |
| Low-Power Battery Monitor Reference | Optocoupler Input Biasing |
Use Scenario: Providing stable reference for comparator-based lithium-ion cell voltage detection in portable medical devices. IC Role / Device Role / Timing Role: Precision shunt regulator feeding non-inverting input of rail-to-rail comparator. Use Value: −2.5 mV/K tempco allows software compensation to hold threshold error below ±10 mV from −20 °C to +60 °C. | Use Scenario: Biasing LED anode in PC817-series optocoupler input stage for isolated CAN bus level translation. IC Role / Device Role / Timing Role: Zener-stabilized current source ensuring consistent CTR across supply voltage variation. Use Value: 500 mW rating sustains 10 mA forward current through 470 Ω series resistor with 12 V supply, maintaining CTR >100%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V9,215 | ±5% tolerance, same SOT23 package and 3.9 V nominal rating | Acceptable where system-level calibration compensates for wider voltage spread | Select when cost sensitivity outweighs ±2% accuracy requirement in consumer-grade power management. |
| MMBZ5226BS-7-F | 3.9 V nominal, ±5%, 350 mW rating, SOT23 package | Limited to lower-power biasing due to reduced power handling | Choose only for sub-70 mA load currents where thermal margin is verified per board layout. |
Compared with BZX84-C3V9,215 and MMBZ5226BS-7-F, the BZX84-B3V9/DG/B3,2 delivers tighter voltage control and higher power margin-critical for uncalibrated industrial references and high-reliability I/O protection where long-term drift must remain below 15 mV.
Availability
BZX84-B3V9/DG/B3,2 is available at Aetrix Electronics and suitable for industrial sensor interfaces, battery-powered medical wearables, and automotive body-control modules requiring stable component supply and long-lifecycle support.
Supply support for BZX84-B3V9/DG/B3,2 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, serving automotive, industrial, and mobile markets with AEC-Q101 qualified components.
The BZX84 series belongs to Nexperia's precision Zener diode product line, engineered for stable voltage reference and overvoltage protection in space-constrained, thermally demanding applications.
FAQ
What is the maximum reverse current this Zener diode can sustain continuously?
The BZX84-B3V9/DG/B3,2 supports continuous reverse current up to 128 mA at 25 °C ambient, calculated from its 500 mW power rating and 3.9 V Zener voltage. Derating applies above 25 °C per the datasheet's thermal resistance curve (375 K/W), requiring ≤90 mA at 85 °C case temperature.
Does this part have AEC-Q101 qualification for automotive use?
Yes, the BZX84-B3V9/DG/B3,2 carries AEC-Q101 qualification for stress testing including HTSL, TCT, and ESD-HBM. It is rated for operation from −65 °C to +150 °C and is approved for use in automotive body electronics, infotainment power rails, and ADAS sensor interface circuits.
Can this Zener diode replace the BZX84-C3V9 in an existing design?
Yes, it is mechanically and electrically compatible with BZX84-C3V9 in SOT23 footprint, but offers tighter ±2% tolerance versus ±5%. No layout change is needed; however, verify that downstream circuitry benefits from improved voltage accuracy and confirm thermal margin remains sufficient at 500 mW.
What is the typical Zener impedance at 1 mA test current?
At 1 mA, the typical dynamic impedance is 220 Ω, per Nexperia's characterization data. This value increases significantly below 5 mA, so designs requiring low-impedance regulation should operate near the 5 mA test point or add parallel capacitance to stabilize output impedance.
BZX84-B3V9/DG/B3,2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±2%
- Power - Max:
- 250 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:
- TO-236AB
BZX84-B3V9/DG/B3,2 FAQ
1.How can I place an order for BZX84-B3V9/DG/B3,2 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-B3V9/DG/B3,2 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 BZX84-B3V9/DG/B3,2 reliable?
The price and inventory of BZX84-B3V9/DG/B3,2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-B3V9/DG/B3,2 is usually 5 days.
3.What payment methods are accepted for BZX84-B3V9/DG/B3,2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-B3V9/DG/B3,2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-B3V9/DG/B3,2?
BZX84-B3V9/DG/B3,2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-B3V9/DG/B3,2 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 BZX84-B3V9/DG/B3,2?
For technical support, including BZX84-B3V9/DG/B3,2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-B3V9/DG/B3,2 requirements.
6.How does Aetrix verify that BZX84-B3V9/DG/B3,2 is sourced from the original manufacturer or authorized distributors?
All BZX84-B3V9/DG/B3,2 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 BZX84-B3V9/DG/B3,2 meets industry standards.
7.What is the process for return or replacement of BZX84-B3V9/DG/B3,2?
All BZX84-B3V9/DG/B3,2 units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-B3V9/DG/B3,2, 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 BZX84-B3V9/DG/B3,2 part is unused and in its original packaging.
Return procedure for BZX84-B3V9/DG/B3,2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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