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Nexperia USA Inc. BZX79-C3V3,143
- Part No.:
- BZX79-C3V3,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C3V3,143.pdf
- Description:
- DIODE ZENER 3.3V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:31,311
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Product details
Overview
BZX79-C3V3,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal 3.3 V breakdown voltage at 5 mA test current, 350 Ω typical differential resistance, and −2.4 mV/K temperature coefficient. It operates as a low-power voltage reference in bias networks, power supply feedback paths, and overvoltage protection circuits for microcontroller I/O rails.
For engineers reviewing the BZX79-C3V3,143 datasheet, BZX79-C3V3,143 pinout, BZX79-C3V3,143 application, or BZX79-C3V3,143 equivalent, this page delivers verified electrical parameters, DO-35 package dimensions, thermal resistance data, reverse leakage (5 μA at 1 V), and validated alternatives for precision analog referencing and stabilization.
Technical Context
This Zener diode functions in reverse-biased breakdown mode to maintain stable voltage across its terminals under varying load and temperature conditions. Its −2.4 mV/K temperature coefficient indicates moderate negative drift, requiring compensation in high-stability references, while its 350 Ω dynamic impedance defines regulation error under current variation.
The device is rated for 500 mW total power dissipation at 50 °C ambient with 8 mm lead length, and supports non-repetitive 40 W surge pulses (100 μs square wave). Its 450 pF junction capacitance at 0 V and 1 MHz limits high-frequency noise filtering capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V at 5 mA test current - defines stable reference point for low-voltage regulation |
| Tolerance | ±5% - allows cost-effective selection where tight voltage accuracy is not required |
| Differential Resistance | 350 Ω typical at 5 mA - determines output voltage shift per mA of load current change |
| Temperature Coefficient | −2.4 mV/K - quantifies voltage drift per degree Celsius rise in junction temperature |
| Reverse Leakage Current | 5 μA max at 1 V reverse bias - sets minimum quiescent current in standby reference circuits |
| Total Power Dissipation | 500 mW at Tamb = 50 °C - defines maximum continuous DC power handling on standard PCB |
| Junction-to-Ambient Thermal Resistance | 380 K/W - governs temperature rise per watt under natural convection cooling |
Pinout & Package
Hermetically sealed axial-leaded glass package per SOD27 (DO-35) outline: 4.25 mm body length, 1.85 mm diameter, 25.4 mm lead spacing, cathode indicated by black band. Lead length ≤ 8 mm for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in reverse-bias configuration | Connected to ground or lower potential node when used as shunt regulator |
| Cathode | Zener breakdown terminal / high-side connection in reverse-bias configuration | Connected to regulated voltage node; marked by black band on glass body |
Key Features
| Feature | Design Value |
|---|---|
| Low-power Zener regulation | 500 mW rating enables use in space-constrained, low-current analog subsystems without heatsinking |
| E24 voltage series coverage | 3.3 V nominal value aligns with common logic supply rails (e.g., 3.3 V MCU I/O) |
| Hermetic glass encapsulation | SOD27 package ensures long-term stability and moisture resistance in industrial environments |
| Non-repetitive surge capability | 40 W peak power (100 μs) provides transient overvoltage clamping in input protection networks |
Applications
| Microcontroller Power Rail Protection | Low-Voltage Reference for ADC Biasing |
|---|---|
Use Scenario: Clamping 3.3 V supply rail against ESD transients and switching noise in embedded sensor nodes. IC Role / Device Role / Timing Role: Shunt regulator providing low-impedance path to ground during overvoltage events. Use Value: Limits rail excursion to ≤3.5 V using 5 μA leakage and 350 Ω dynamic impedance, preserving I/O integrity. |
Use Scenario: Generating stable 3.3 V reference for 10-bit SAR ADC in battery-powered IoT endpoint. IC Role / Device Role / Timing Role: Passive voltage reference establishing precise input full-scale range. Use Value: Enables ±1.5 LSB offset error budget via ±5% tolerance and −2.4 mV/K drift compensated by calibration. |
| Linear Regulator Feedback Divider | Overvoltage Detection Threshold |
Use Scenario: Setting output voltage of adjustable LDO (e.g., LM1117) via resistor divider anchored to Zener. IC Role / Device Role / Timing Role: Precision voltage node defining feedback reference point. Use Value: Maintains ±1.5% output accuracy over 0–70 °C using 350 Ω rdif and known divider ratio. |
Use Scenario: Triggering shutdown circuit when 3.3 V system rail exceeds safe threshold in automotive body control module. IC Role / Device Role / Timing Role: Voltage threshold detector with hysteresis added externally. Use Value: Activates comparator at 3.37 V (max VZ) with <1 μs response, leveraging 450 pF junction capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5226BS-7-F (Diodes Inc.) | 3.3 V, ±5%, SOT-23 package, 200 mW Ptot, 600 Ω rdif | Surface-mount footprint; higher dynamic impedance reduces regulation precision | Select for automated assembly where board space is constrained and 600 Ω rdif meets error budget |
| 1N4728A (ON Semiconductor) | 3.3 V, ±5%, DO-41 package, 1 W Ptot, 10 Ω rdif | Higher power rating and lower impedance improve regulation but require larger PCB area | Select for higher-current reference loads (>10 mA) or where thermal margin above 500 mW is needed |
Compared with BZX79-C3V3,143, MMBZ5226BS-7-F trades regulation accuracy for SMT compatibility, while 1N4728A offers superior dynamic performance at the cost of larger through-hole packaging and higher power dissipation.
Availability
BZX79-C3V3,143 is available at Aetrix Electronics and suitable for microcontroller power rail protection, low-voltage ADC reference generation, and linear regulator feedback networks requiring stable component supply and long-lifecycle support.
Supply support for BZX79-C3V3,143 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 leader in discrete, logic, and PowerMOS semiconductors, serving automotive, industrial, computing, and consumer markets with high-volume, high-reliability components.
This device belongs to the BZX79 series of low-power Zener diodes designed for cost-sensitive voltage regulation and referencing in space-constrained, low-current analog circuits.
FAQ
What is the maximum continuous reverse current this diode can handle?
The BZX79-C3V3,143 has no specified maximum continuous reverse current rating; instead, it is limited by power dissipation. At 3.3 V Zener voltage and 500 mW total power, the absolute maximum continuous Zener current is approximately 151 mA (500 mW ÷ 3.3 V), assuming all power is dissipated in the diode and ambient temperature remains at 50 °C.
Can this diode be used in surface-mount designs?
No - BZX79-C3V3,143 uses the axial-leaded SOD27 (DO-35) glass package and is not compatible with surface-mount assembly. For SMT equivalents, consider MMBZ5226BS-7-F (SOT-23) or BZX84-C3V3 (SOT-23), both offering similar 3.3 V regulation in tape-and-reel format.
How does the −2.4 mV/K temperature coefficient affect circuit accuracy?
A −2.4 mV/K coefficient means the Zener voltage decreases by 2.4 mV per Kelvin rise in junction temperature. Over a 50 °C rise (e.g., from 25 °C to 75 °C), voltage drops ~120 mV - a 3.6% shift from 3.3 V - requiring calibration or compensation in precision references.
Is the cathode marked on the physical device?
Yes - the cathode is identified by a single black band on the glass body of the SOD27 package. This marking aligns with JEDEC DO-35 standards and must be oriented toward the higher-potential node when used in reverse-bias regulation configuration.
BZX79-C3V3,143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ALF2
BZX79-C3V3,143 FAQ
1.How can I place an order for BZX79-C3V3,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C3V3,143 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 BZX79-C3V3,143 reliable?
The price and inventory of BZX79-C3V3,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C3V3,143 is usually 5 days.
3.What payment methods are accepted for BZX79-C3V3,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C3V3,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C3V3,143?
BZX79-C3V3,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C3V3,143 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 BZX79-C3V3,143?
For technical support, including BZX79-C3V3,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C3V3,143 requirements.
6.How does Aetrix verify that BZX79-C3V3,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-C3V3,143 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 BZX79-C3V3,143 meets industry standards.
7.What is the process for return or replacement of BZX79-C3V3,143?
All BZX79-C3V3,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C3V3,143, 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 BZX79-C3V3,143 part is unused and in its original packaging.
Return procedure for BZX79-C3V3,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79-C3V3,143 Tags
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MM5Z5V1ST1G
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