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Nexperia USA Inc. BZX79-B30,143
- Part No.:
- BZX79-B30,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B30,143.pdf
- Description:
- DIODE ZENER 30V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:4,990
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Product details
Overview
BZX79-B30,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal working voltage 30 V at 2 mA test current, 70 Ω typical differential resistance, and −20.6 mV/K temperature coefficient. It operates in low-power stabilization circuits requiring precise reference voltages, such as power supply feedback loops and sensor biasing networks.
For engineers reviewing the BZX79-B30,143 datasheet, BZX79-B30,143 pinout, BZX79-B30,143 application, or BZX79-B30,143 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance, temperature coefficient, reverse leakage at specified VR, and non-repetitive surge capability for transient protection integration.
Technical Context
This device functions as a two-terminal voltage reference operating in reverse breakdown mode. Its Zener voltage is stabilized by avalanche mechanism above ~6 V, confirmed by its positive temperature coefficient (+20.6 mV/K) and 70 Ω typical differential resistance at IZ = 2 mA.
Designed for DC voltage regulation in space-constrained applications, it delivers stable 30 V reference under 500 mW total power dissipation (Tamb = 50 °C, lead length ≤8 mm), with non-repetitive peak reverse power handling up to 40 W for 100 μs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 29.4 V to 30.6 V at IZ = 2 mA - ensures tight 30 V reference with ±2% initial accuracy for precision feedback paths |
| Differential Resistance rdiff | 70 Ω typical at IZ = 2 mA - defines output impedance affecting load regulation error in shunt regulator designs |
| Temperature Coefficient SZ | +20.6 mV/K at IZ = 2 mA - quantifies voltage drift per degree Celsius, critical for thermal stability in unregulated environments |
| Reverse Current IR | 100 nA max at VR = 8 V - determines quiescent power loss and noise contribution in high-impedance reference nodes |
| Total Power Dissipation Ptot | 500 mW at Tamb = 50 °C - sets maximum continuous DC power handling without heatsinking on standard PCB |
| Non-repetitive Peak Power PZSM | 40 W for tp = 100 μs - enables limited transient overvoltage clamping in low-energy surge scenarios |
Pinout & Package
Hermetically sealed glass axial-leaded SOD27 (DO-35) package with cathode indicated by a band. Device has two terminals: anode and cathode - no internal circuitry or control logic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to system ground or lower-potential rail; establishes reference point for Zener operation |
| Cathode | Reverse breakdown terminal / Voltage regulation node | Connected to regulated voltage node; maintains 30 V relative to anode when reverse biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct replacement in precision reference designs without recalibration or resistor trimming |
| Low differential resistance (70 Ω typ.) | Minimizes output voltage variation under changing load current, improving regulation linearity |
| Hermetic glass SOD27 package | Provides long-term reliability and moisture resistance in industrial ambient conditions |
| 40 W non-repetitive surge rating | Allows incidental use in low-duty-cycle overvoltage suppression without external TVS devices |
Applications
| Power Supply Feedback Reference | Sensor Biasing Network |
|---|---|
Use Scenario: Providing stable 30 V reference for optocoupler-based feedback in isolated AC/DC flyback converters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing error amplifier input threshold. Use Value: Tight ±2% tolerance and low 70 Ω dynamic impedance ensure <±1% output voltage regulation across line/load variations. | Use Scenario: Biasing a high-impedance pressure transducer bridge requiring stable excitation voltage. IC Role / Device Role / Timing Role: Precision DC voltage source for analog sensor signal conditioning. Use Value: Low 100 nA reverse leakage at 8 V prevents loading errors in microamp-level bridge currents. |
| Microcontroller Reset Circuit | Industrial Analog Input Protection |
Use Scenario: Generating clean 30 V threshold for external reset supervisor IC monitoring main rail voltage. IC Role / Device Role / Timing Role: Stable voltage reference for comparator trip point setting. Use Value: +20.6 mV/K temperature coefficient allows predictable trip-point drift compensation in wide-temperature-range systems. | Use Scenario: Clamping analog input pins against ESD or short-duration transients in PLC analog modules. IC Role / Device Role / Timing Role: Low-energy surge limiter leveraging 40 W non-repetitive pulse rating. Use Value: Enables single-device dual function: precision reference + transient suppression without adding discrete TVS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 30 V nominal, ±5% tolerance, 80 Ω typical rdiff, +25 mV/K SZ | Higher voltage drift and looser tolerance reduce accuracy in precision feedback loops | Select when cost sensitivity outweighs regulation accuracy requirements |
| BZX84-C30 | 30 V nominal, ±5%, SOT-23 surface-mount, 150 mW Ptot, 80 Ω rdiff | Lower power rating and different package limit use in through-hole legacy designs or higher-power circuits | Select for space-constrained PCB layouts where reflow compatibility is required |
Compared with BZX79-B30,143, the 1N4749A trades tighter voltage control for broader availability and lower cost, while the BZX84-C30 sacrifices power handling and thermal robustness for miniaturization-making the BZX79-B30,143 optimal for through-hole, medium-power, precision-stable references.
Availability
BZX79-B30,143 is available at Aetrix Electronics and suitable for power supply feedback references, sensor biasing networks, microcontroller reset circuits, and industrial analog input protection requiring stable component supply and long-term obsolescence resilience.
Supply support for BZX79-B30,143 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 semiconductors, formed in 2017 from the former NXP Standard Products division, specializing in high-volume, high-reliability components for automotive and industrial markets.
The BZX79 series belongs to Nexperia's voltage regulator diode product line, engineered for cost-effective, stable DC voltage referencing in legacy and new-design through-hole applications where hermetic reliability and ±2% accuracy are essential.
FAQ
What is the maximum continuous power dissipation for BZX79-B30,143 at 70 °C ambient?
At 70 °C ambient, the device exceeds its rated 500 mW dissipation limit due to thermal derating. With Rth j-a = 380 K/W, junction temperature would exceed 200 °C. Derated power is approximately 260 mW using linear derating from 500 mW at 50 °C, confirming mandatory use below 50 °C ambient or with PCB copper area enhancement.
Does BZX79-B30,143 support bidirectional transient suppression?
No. As a Zener diode, it conducts only in reverse breakdown (cathode positive relative to anode). Forward conduction occurs at ~0.9 V, offering negligible clamping in forward polarity. For bidirectional protection, a back-to-back Zener pair or dedicated TVS array is required.
Can BZX79-B30,143 be used in place of BZX79-C30?
Yes, but with trade-offs: BZX79-B30,143 offers ±2% tolerance versus ±5% for the 'C' version, delivering tighter regulation. However, its tighter tolerance may increase cost and reduce availability in high-volume commodity applications where ±5% suffices.
What is the cathode marking convention on the SOD27 package?
The cathode is marked by a distinct color band (typically black or dark stripe) located near one end of the glass body. When oriented with the band on the left, the right-hand lead is the anode and the left-hand lead is the cathode-consistent with industry-standard DO-35 polarity identification.
BZX79-B30,143 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):
- 30 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 21 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-B30,143 FAQ
1.How can I place an order for BZX79-B30,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B30,143 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-B30,143 reliable?
The price and inventory of BZX79-B30,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B30,143 is usually 5 days.
3.What payment methods are accepted for BZX79-B30,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B30,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B30,143?
BZX79-B30,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B30,143 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-B30,143?
For technical support, including BZX79-B30,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B30,143 requirements.
6.How does Aetrix verify that BZX79-B30,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-B30,143 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-B30,143 meets industry standards.
7.What is the process for return or replacement of BZX79-B30,143?
All BZX79-B30,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B30,143, 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-B30,143 part is unused and in its original packaging.
Return procedure for BZX79-B30,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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