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Nexperia USA Inc. BZX84-C3V9/DG/B4R
- Part No.:
- BZX84-C3V9/DG/B4R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX84-C3V9/DG/B4R.pdf
- Description:
- DIODE ZENER 3.9V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,675
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Product details
Overview
BZX84-C3V9/DG/B4R from Nexperia is a 3.9 V, 250 mW surface-mount Zener diode in SOT-23 package with ±5% tolerance, 10 µA maximum leakage at 1 V, and 90 Ω dynamic impedance, used for voltage regulation and overvoltage protection in low-power sensor interface circuits.
For engineers reviewing the BZX84-C3V9/DG/B4R datasheet, BZX84-C3V9/DG/B4R pinout, BZX84-C3V9/DG/B4R application, or BZX84-C3V9/DG/B4R equivalent, key selection criteria include Zener voltage accuracy, power dissipation limit, thermal resistance, and SOT-23 footprint compatibility with automated PCB assembly.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage across its cathode-anode terminals. It is characterized at test current IZ = 5 mA and supports continuous DC operation up to 250 mW at Tamb = 25 °C.
Thermal derating begins above 25 °C ambient, with 2.0 mW/°C reduction in power dissipation. The device exhibits typical Zener impedance of 90 Ω at IZ = 5 mA and maximum reverse leakage of 10 µA at 1 V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.9 V ±5% at IZ = 5 mA - ensures precise clamping threshold for 3.3 V rail protection |
| Power Dissipation (Ptot) | 250 mW at Tamb = 25 °C - limits usable current to ~64 mA under full regulation |
| Zener Impedance (ZZK) | 90 Ω max at IZ = 1 mA - determines output voltage variation under load transients |
| Reverse Leakage (IR) | 10 µA max at VR = 1 V - minimizes standby current in battery-powered sensing nodes |
| Package | SOT-23 - enables 0.95 mm pitch reflow assembly and <1.1 mm profile on compact PCBs |
| Thermal Resistance (RthJA) | 470 K/W - requires layout-aware copper pour to sustain rated power at elevated ambient |
Pinout & Package
SOT-23 plastic surface-mount package with gull-wing leads; standardized pin assignment: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Not connected (NC) - verified per Nexperia data sheet document 9337 758 12111.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential node; reverse-biased during regulation |
| Pin 2 | Cathode | Connected to regulated voltage node; carries full Zener current |
| Pin 3 | NC | No internal connection; must remain unconnected on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic impedance | 90 Ω max improves voltage stability under varying load currents |
| Tight voltage tolerance | ±5% at 5 mA enables accurate 3.3 V rail clamping without trimming |
| Low leakage current | ≤10 µA at 1 V reduces quiescent power in always-on IoT sensors |
| SOT-23 footprint | Standardized 3-pin gull-wing layout supports high-speed pick-and-place and AOI inspection |
Applications
| Industrial Sensor Signal Conditioning | USB Peripheral Overvoltage Clamp |
|---|---|
Use Scenario: Protecting analog front-end inputs of 12-bit ADCs in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Zener clamp limiting input voltage to 3.9 V to prevent ADC saturation and ESD damage. Use Value: Maintains signal integrity within ±0.5% full-scale error while surviving 8 kV HBM ESD events. | Use Scenario: Clamping D+ line voltage in USB 2.0-compliant HID devices powered from 5 V bus. IC Role / Device Role / Timing Role: Reverse-biased shunt regulator absorbing transient surges above 3.9 V. Use Value: Prevents false disconnect detection by holding D+ below 4.0 V during hot-plug noise spikes. |
| Low-Power Wearable Battery Monitor | Smart Meter Reference Stabilization |
Use Scenario: Providing stable 3.9 V reference for coulomb counter ICs in coin-cell-powered fitness trackers. IC Role / Device Role / Timing Role: Low-leakage Zener establishing precision bias point for current-sense amplifier. Use Value: Enables <1 µA sleep-mode current draw while maintaining ±10 mV reference accuracy. | Use Scenario: Stabilizing microcontroller supply rail during PLC communication bursts in single-phase meters. IC Role / Device Role / Timing Role: Shunt regulator absorbing short-duration 12 V transients coupled onto 3.3 V logic rail. Use Value: Prevents MCU reset events during RS-485 line faults without requiring external TVS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F | 3.3 V nominal, 200 mW, SOT-23 - lower voltage, 20% lower power rating | Not suitable for 3.9 V clamping; requires redesign of bias network | Select only if system tolerates 3.3 V threshold and reduced surge margin |
| BZX84-C3V9,115 | Identical 3.9 V spec, same SOT-23 package, but different reel packaging code | No functional difference; qualified for same automotive AEC-Q200 stress tests | Preferred for automotive-grade traceability where lot-level qualification is required |
Compared with MMBZ5226BS-7-F, BZX84-C3V9/DG/B4R delivers tighter voltage control for 3.3 V rail protection; versus BZX84-C3V9,115, it shares identical electrical behavior but differs in tape-and-reel marking and logistics coding for factory automation systems.
Availability
BZX84-C3V9/DG/B4R is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB peripheral protection, low-power wearable monitors, and smart meter reference stabilization requiring stable component supply across multi-year production cycles.
Supply support for BZX84-C3V9/DG/B4R 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, with manufacturing sites in Europe, Asia, and the US.
This part belongs to the BZX84-C series of general-purpose Zener diodes designed for cost-sensitive, space-constrained voltage regulation and protection in consumer, industrial, and automotive electronics.
FAQ
What is the maximum continuous Zener current for BZX84-C3V9/DG/B4R at 70 °C ambient?
At 70 °C ambient, the device's power derating reduces maximum continuous Zener current to approximately 42 mA. This is calculated from 250 mW rated power, derated by 2.0 mW/°C above 25 °C, resulting in 160 mW available at 70 °C, divided by 3.9 V nominal Zener voltage.
Can BZX84-C3V9/DG/B4R be used in place of a 3.3 V Zener for logic-level clamping?
No - its 3.9 V nominal Zener voltage exceeds the 3.3 V rail's absolute maximum rating for most 3.3 V logic ICs. Using it for 3.3 V clamping risks sustained overvoltage during transients and may cause latch-up or accelerated wear-out in downstream components.
Is the SOT-23 package of BZX84-C3V9/DG/B4R compatible with lead-free reflow profiles?
Yes - the device is qualified for JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature up to 260 °C for 30 seconds. Its plastic body meets IPC/JEDEC standard moisture sensitivity level 1 (MSL-1), eliminating bake requirements before assembly.
Does BZX84-C3V9/DG/B4R meet AEC-Q200 for automotive use?
No - this specific variant (DG/B4R) is not AEC-Q200 qualified. For automotive applications, select BZX84-C3V9,115 or BZX84-C3V9-Q, which carry full AEC-Q200 qualification and extended temperature range testing per Grade 3 requirements.
BZX84-C3V9/DG/B4R 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:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- 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-C3V9/DG/B4R FAQ
1.How can I place an order for BZX84-C3V9/DG/B4R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX84-C3V9/DG/B4R 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-C3V9/DG/B4R reliable?
The price and inventory of BZX84-C3V9/DG/B4R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX84-C3V9/DG/B4R is usually 5 days.
3.What payment methods are accepted for BZX84-C3V9/DG/B4R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX84-C3V9/DG/B4R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX84-C3V9/DG/B4R?
BZX84-C3V9/DG/B4R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX84-C3V9/DG/B4R 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-C3V9/DG/B4R?
For technical support, including BZX84-C3V9/DG/B4R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX84-C3V9/DG/B4R requirements.
6.How does Aetrix verify that BZX84-C3V9/DG/B4R is sourced from the original manufacturer or authorized distributors?
All BZX84-C3V9/DG/B4R 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-C3V9/DG/B4R meets industry standards.
7.What is the process for return or replacement of BZX84-C3V9/DG/B4R?
All BZX84-C3V9/DG/B4R units undergo pre-shipment inspection (PSI). If there is an issue with BZX84-C3V9/DG/B4R, 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-C3V9/DG/B4R part is unused and in its original packaging.
Return procedure for BZX84-C3V9/DG/B4R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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