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Nexperia USA Inc. BZX79-C75,143
- Part No.:
- BZX79-C75,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C75,143.pdf
- Description:
- DIODE ZENER 75V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:160,000
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Product details
Overview
BZX79-C75,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal breakdown voltage of 75 V at 2 mA test current, 170 Ω typical differential resistance, and −255 mV/K temperature coefficient magnitude. It operates as a low-power voltage reference in bias networks, overvoltage clamping circuits, and analog signal conditioning stages where stable 75 V regulation under 500 mW dissipation is required.
For engineers reviewing the BZX79-C75,143 datasheet, BZX79-C75,143 pinout, BZX79-C75,143 application, or BZX79-C75,143 equivalent, this part is selected for precision low-current voltage referencing, reverse-biased stabilization in sensor interfaces, and transient-suppressed reference generation in industrial power supplies.
Technical Context
This diode functions exclusively in reverse-bias breakdown mode, with Zener mechanism dominant above 6 V. Its 75 V nominal working voltage is specified at IZtest = 2 mA, and its differential resistance (170 Ω typ., 500 Ω max.) defines regulation stiffness under load variation.
Thermal behavior is governed by Rth j-a = 380 K/W (lead length ≤8 mm, no PCB pad), limiting continuous operation to Tamb ≤50 °C at full 500 mW dissipation. Non-repetitive surge capability reaches 40 W for 100 μs pulses at Tj = 25 °C prior to surge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Working Voltage (VZ) | 73.5–76.5 V at IZ = 2 mA; ensures ±5% regulation window for 75 V reference design |
| Differential Resistance (rdif) | 170 Ω typ., 500 Ω max.; determines output impedance and load regulation error |
| Temperature Coefficient (SZ) | −255 mV/K max.; quantifies voltage drift per °C rise in junction temperature |
| Reverse Current (IR) | 50 nA max. at VR = 0.7 × VZnom = 52.5 V; defines leakage-induced error in high-impedance bias networks |
| Total Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C; sets maximum continuous DC power handling on standard PCB layout |
| Non-repetitive Peak Power (PZSM) | 40 W for 100 μs square wave; enables short-duration overvoltage clamping without failure |
Pinout & Package
Hermetically sealed axial-leaded SOD27 (DO-35) glass package with cathode indicated by a black band. Leads are tinned copper-clad steel, suitable for through-hole soldering. Package dimensions: D = 1.85 mm max., L = 25.4 mm min., b = 0.56 mm max.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-impedance path during forward bias | Connects to lower-potential node in reverse-bias configuration; used for polarity verification and ESD protection testing |
| Cathode | Breakdown terminal / regulated voltage output node | Marked with black band; connects to regulated rail; voltage referenced to anode in Zener mode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% voltage tolerance | Enables cost-effective selection for non-critical 75 V references where tighter tolerance is unnecessary |
| 500 mW total power rating | Supports stable operation in low-power analog circuits without heatsinking |
| Hermetic glass SOD27 package | Ensures long-term reliability and moisture resistance in industrial environments |
| Low 50 nA leakage at 52.5 V | Minimizes current error in high-impedance voltage divider or op-amp feedback networks |
Applications
| Industrial Sensor Biasing | Overvoltage Clamp for 48 V Systems |
|---|---|
Use Scenario: Providing stable 75 V bias to piezoelectric transducer amplifiers in vibration monitoring systems. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to generate fixed reference voltage for op-amp input stage. Use Value: Maintains <±1% output stability across −40 °C to +85 °C ambient due to known thermal coefficient and low leakage. | Use Scenario: Clamping transient spikes on 48 V DC bus lines in factory automation controllers. IC Role / Device Role / Timing Role: Standby shunt element that conducts only during >75 V surges, diverting energy to ground. Use Value: Absorbs up to 40 W for 100 μs without degradation, protecting downstream DC-DC converters rated for 60 V max. |
| Programmable Power Supply Reference | Analog Multimeter High-Voltage Range |
Use Scenario: Setting upper limit of adjustable 0–100 V linear power supply via feedback divider network. IC Role / Device Role / Timing Role: Precision voltage reference node in resistive divider feeding error amplifier. Use Value: 170 Ω dynamic resistance ensures minimal loading effect on divider ratio, preserving setpoint accuracy. | Use Scenario: Extending DC voltage measurement range to 100 V in handheld multimeters using internal resistive scaling. IC Role / Device Role / Timing Role: Stable 75 V reference enabling calibrated attenuation of input signal before ADC sampling. Use Value: Low 50 nA leakage prevents significant current draw from high-impedance probe circuitry, preserving meter input impedance >10 MΩ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | 14 V nominal, 1 W rating, DO-41 package, ±5% tolerance | Lower voltage, higher power; unsuitable for 75 V reference but usable in 15 V systems requiring greater surge margin | Select only if target voltage is ~14 V and board space allows larger DO-41 footprint |
| BZX85C75 | 75 V nominal, 1.3 W rating, DO-41 package, ±5% tolerance | Same voltage grade but higher power and larger package; requires different PCB layout and thermal management | Choose when continuous dissipation exceeds 500 mW or surge duty cycle demands >40 W capability |
Compared with BZX79-C75,143, the 1N4744A serves lower-voltage applications with higher surge resilience, while BZX85C75 offers identical regulation voltage but supports higher steady-state power-making both unsuitable as drop-in replacements without layout and thermal redesign.
Availability
BZX79-C75,143 is available at Aetrix Electronics and suitable for industrial sensor biasing, overvoltage clamping in 48 V systems, and programmable power supply reference designs requiring stable component supply and long-lifecycle support.
Supply support for BZX79-C75,143 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, industrial, and computing markets.
The BZX79 series belongs to Nexperia's legacy Zener diode product line, engineered specifically for cost-sensitive, low-power voltage regulation and reference applications in consumer and industrial electronics.
FAQ
What is the maximum continuous reverse voltage this diode can regulate at?
The BZX79-C75,143 is rated for nominal 75 V regulation at 2 mA test current, with guaranteed minimum 73.5 V and maximum 76.5 V across the ±5% tolerance band. It must be operated within its 500 mW power limit - at 75 V, this restricts continuous reverse current to ≤6.67 mA - and derated above 50 °C ambient temperature per its 380 K/W thermal resistance.
How does the temperature coefficient affect voltage stability in real circuits?
With a maximum temperature coefficient of −255 mV/K, the BZX79-C75,143 exhibits predictable negative drift: voltage decreases ~19 mV per 75 °C junction rise. In a 75 V reference, this translates to ~0.025% per °C change - critical in unheated enclosures or thermally coupled layouts. Designers must account for this in high-accuracy applications using compensation networks or calibration offsets.
Can this diode be used in forward-bias mode like a standard rectifier?
No - the BZX79-C75,143 is optimized for reverse-bias Zener operation. Its forward voltage is 0.9 V at 10 mA, but it lacks the surge current rating, soft recovery, or low forward drop needed for rectification. Using it forward-biased risks premature aging or parametric shift due to unintended forward conduction during transient events.
Is the SOD27 package compatible with automated through-hole assembly?
Yes - the SOD27 (DO-35) package has standardized axial leads with 25.4 mm minimum length and 0.56 mm max. diameter, fully compatible with standard wave soldering and selective soldering equipment. The hermetic glass body withstands typical lead-free reflow preheat profiles, though hand-soldering requires ≤350 °C tip temperature and <3 s dwell time to avoid seal fracture.
BZX79-C75,143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±5%
- 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-C75,143 FAQ
1.How can I place an order for BZX79-C75,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C75,143 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-C75,143 reliable?
The price and inventory of BZX79-C75,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C75,143 is usually 5 days.
3.What payment methods are accepted for BZX79-C75,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C75,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C75,143?
BZX79-C75,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C75,143 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-C75,143?
For technical support, including BZX79-C75,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C75,143 requirements.
6.How does Aetrix verify that BZX79-C75,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-C75,143 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-C75,143 meets industry standards.
7.What is the process for return or replacement of BZX79-C75,143?
All BZX79-C75,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C75,143, 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-C75,143 part is unused and in its original packaging.
Return procedure for BZX79-C75,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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