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Nexperia USA Inc. BZX79-B75,143
- Part No.:
- BZX79-B75,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-B75,143.pdf
- Description:
- DIODE ZENER 75V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:2,096
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Product details
Overview
BZX79-B75,143 from Nexperia is a ±2% tolerance Zener voltage regulator diode with nominal breakdown voltage of 75 V, total power dissipation up to 500 mW at Tamb = 50 °C, differential resistance ≤500 Ω at IZ = 2 mA, and non-repetitive peak reverse power dissipation of 40 W (tp = 100 μs). It serves as a precision low-power voltage reference in analog front-ends and power supply feedback networks.
For engineers reviewing the BZX79-B75,143 datasheet, BZX79-B75,143 pinout, BZX79-B75,143 application, or BZX79-B75,143 equivalent, key selection criteria include Zener voltage tolerance (±2%), thermal resistance (Rth j-a = 380 K/W), reverse leakage current (≤50 nA at VR = 0.7×VZ), junction temperature range (−65 to +200 °C), and DO-35 package compatibility with through-hole PCB assembly.
Technical Context
This device operates in reverse-bias breakdown mode with tightly controlled Zener voltage (73.5–76.5 V at IZ = 2 mA) and low temperature coefficient (+73.4 to +88.6 mV/K at IZ = 2 mA), enabling stable reference performance across industrial temperature ranges. Its hermetically sealed SOD27 (DO-35) glass package ensures long-term parameter stability under humidity and thermal cycling.
The diode exhibits low dynamic impedance (170 Ω typical, 500 Ω max at IZ = 2 mA) and minimal capacitance (35 pF at f = 1 MHz, VR = 0 V), supporting fast transient response in regulation loops. Non-repetitive surge capability (IZSM = 0.2 A, tp = 100 μs) provides limited overvoltage protection in low-energy clamp applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 73.5–76.5 V at IZ = 2 mA; defines precise DC reference point for feedback or biasing |
| Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C; sets maximum continuous DC power handling on standard PCB |
| Differential Resistance (rdif) | 170 Ω typ., 500 Ω max. at IZ = 2 mA; determines output impedance and load regulation error |
| Reverse Leakage (IR) | ≤50 nA at VR = 52.5 V (0.7×VZ); ensures minimal current draw in high-impedance reference nodes |
| Thermal Resistance (Rth j-a) | 380 K/W; limits junction temperature rise under ambient conditions without heatsinking |
| Capacitance (Cd) | 35 pF at 1 MHz, VR = 0 V; affects high-frequency noise coupling and loop stability |
| Non-repetitive Surge (PZSM) | 40 W at tp = 100 μs; supports single-event transient suppression in low-duty-cycle circuits |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a black band. Dimensions: D = 4.25 mm max., L = 25.4 mm min., b = 0.56 mm max., G1 = 1.85 mm max. Lead spacing matches standard 0.3-inch pitch through-hole footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in Zener operation | Connected to ground or lower potential node when used as shunt regulator |
| Cathode | Reverse breakdown terminal / high-voltage side in Zener operation | Marked with black band; connected to input rail or feedback node requiring stable reference |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables direct use in precision references without trimming or calibration |
| Hermetic glass SOD27 package | Guarantees long-term parametric stability in humid or thermally cycled environments |
| Low leakage current (≤50 nA) | Minimizes error in high-impedance voltage divider or op-amp reference inputs |
| Controlled temperature coefficient (+73.4 to +88.6 mV/K) | Supports predictable drift compensation in temperature-sensitive analog circuits |
| 40 W non-repetitive surge rating | Provides margin against ESD or line transients without external clamping components |
Applications
| Industrial Power Supply Feedback | Automotive Sensor Biasing |
|---|---|
|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 75 V threshold for TL431-like control circuitry. Use Value: Tight ±2% tolerance eliminates need for external resistor trimming, reducing BOM count and calibration steps. |
Use Scenario: Providing stable bias voltage to piezoresistive pressure sensors in engine control units. IC Role / Device Role / Timing Role: Precision Zener reference supplying excitation voltage to sensor bridge. Use Value: Low 50 nA leakage prevents loading errors in high-impedance sensor interfaces, preserving measurement accuracy. |
| Test Equipment Voltage Calibration | Telecom Line Interface Protection |
|
Use Scenario: Generating traceable DC reference points in portable multimeters and calibrators. IC Role / Device Role / Timing Role: Primary voltage standard in resistive divider networks for 75 V range scaling. Use Value: Hermetic SOD27 construction ensures metrological stability over time and environmental stress. |
Use Scenario: Clamping induced surges on telephone line interface circuits per ITU-T K.20. IC Role / Device Role / Timing Role: Low-energy transient suppressor limiting voltage to 75 V during lightning-induced spikes. Use Value: 40 W/100 μs surge rating absorbs defined threat levels without degradation, meeting basic telecom immunity requirements. |
Availability
BZX79-B75,143 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, test equipment calibration, and telecom line protection requiring stable component supply and long-lifecycle support.
Supply support for BZX79-B75,143 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, formed in 2017 from the former NXP Standard Products business, with focus on automotive, industrial, computing, and consumer markets.
The BZX79 series belongs to Nexperia's precision Zener diode product line, engineered for stable low-power voltage regulation and referencing in cost-sensitive, high-reliability applications.
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics BZX79-C75 | Approx. ±5% tolerance (71.25–78.75 V), higher max. IR (100 nA), same DO-35 package | Acceptable where tighter voltage accuracy is not required and cost is prioritized | Select for non-critical biasing where ±5% variation is tolerable and BOM cost reduction is key |
| Vishay BZX55-C75 | ±5% tolerance, 600 mW Ptot at 50 °C, rdif ≈ 600 Ω max., different thermal resistance (Rth j-a = 400 K/W) | Suitable for higher-power dissipation scenarios but with reduced voltage precision | Choose when higher continuous power handling is needed and ±5% tolerance aligns with system budget |
Compared with BZX79-B75,143, the BZX79-C75 trades voltage accuracy for cost, while the BZX55-C75 offers higher power rating but looser tolerance and inferior thermal performance-making the BZX79-B75,143 optimal for precision reference roles demanding ±2% stability and proven long-term reliability in glass packages.
FAQ
What is the maximum continuous power dissipation for BZX79-B75,143?
The BZX79-B75,143 has a total power dissipation of 500 mW at ambient temperature of 50 °C with leads mounted per standard PCB layout (no metallization pad, lead length ≤8 mm). At 25 °C ambient, derating applies per thermal resistance curves; actual usable power depends on board layout and airflow.
Does BZX79-B75,143 meet automotive AEC-Q200 requirements?
No-BZX79-B75,143 is not AEC-Q200 qualified. It is rated for industrial temperature range (−65 to +200 °C) and intended for general-purpose and commercial-grade applications. For automotive use, Nexperia offers AEC-Q200 qualified alternatives such as the BZX84 series in SOT-23.
Can BZX79-B75,143 be used in surface-mount designs?
No-it is exclusively available in axial-leaded SOD27 (DO-35) glass package and requires through-hole mounting. Surface-mount equivalents with similar specifications include Nexperia's BZX384-B75 (SOD-323) or BZX584-C75 (SOD-523), which differ in package, thermal behavior, and surge capability.
What is the typical Zener impedance at 75 V operation?
At IZ = 2 mA and Tj = 25 °C, the differential resistance (rdif) is 170 Ω typical and 500 Ω maximum. This value increases significantly below 1 mA and decreases slightly above 5 mA, directly impacting regulation accuracy under varying load currents.
BZX79-B75,143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±2%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 255 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 52.5 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-B75,143 FAQ
1.How can I place an order for BZX79-B75,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-B75,143 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-B75,143 reliable?
The price and inventory of BZX79-B75,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-B75,143 is usually 5 days.
3.What payment methods are accepted for BZX79-B75,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-B75,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-B75,143?
BZX79-B75,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-B75,143 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-B75,143?
For technical support, including BZX79-B75,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-B75,143 requirements.
6.How does Aetrix verify that BZX79-B75,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-B75,143 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-B75,143 meets industry standards.
7.What is the process for return or replacement of BZX79-B75,143?
All BZX79-B75,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-B75,143, 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-B75,143 part is unused and in its original packaging.
Return procedure for BZX79-B75,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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