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Nexperia USA Inc. BZX79-C68,143
- Part No.:
- BZX79-C68,143
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79-C68,143.pdf
- Description:
- DIODE ZENER 68V 400MW ALF2
- Quantity:
- Payment:
- Shipping:
Inventory:9,702
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Product details
Overview
BZX79-C68,143 from Nexperia is a ±5% tolerance Zener voltage regulator diode with nominal breakdown voltage of 68 V, total power dissipation up to 500 mW, differential resistance ≤150 Ω at 2 mA, and thermal resistance from junction to ambient of 380 K/W. It operates as a low-power voltage reference in discrete analog circuits requiring stable DC biasing or overvoltage clamping.
For engineers reviewing the BZX79-C68,143 datasheet, BZX79-C68,143 pinout, BZX79-C68,143 application, or BZX79-C68,143 equivalent, key selection criteria include Zener voltage tolerance (±5%), non-repetitive peak reverse power (40 W), junction-to-ambient thermal resistance (380 K/W), cathode identification via band marking, and DO-35 axial-leaded glass package compatibility with through-hole PCB assembly.
Technical Context
This device functions as a two-terminal silicon Zener diode operating in reverse breakdown mode to maintain a stable reference voltage across its terminals under controlled current conditions. Its voltage regulation relies on avalanche breakdown mechanism above ~6 V, confirmed by positive temperature coefficient (+90 mV/K typical at 2 mA) and low dynamic impedance (≤150 Ω).
The BZX79-C68,143 is rated for continuous forward current up to 250 mA and non-repetitive peak reverse current up to 0.25 A (at 100 μs pulse width). It features hermetically sealed SOD27 (DO-35) glass package with axial leads, cathode indicated by a color band, and storage temperature range from −65 °C to +200 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 66.6 V to 69.4 V at IZ = 2 mA - defines stable regulation window for precision reference use |
| Power Dissipation (Ptot) | 500 mW at Tamb = 50 °C - sets maximum steady-state power handling on standard PCB |
| Differential Resistance (rdif) | ≤150 Ω at IZ = 2 mA - determines output impedance and load regulation sensitivity |
| Temperature Coefficient (SZ) | +90 mV/K typical at IZ = 2 mA - quantifies voltage drift per degree Celsius rise |
| Reverse Current (IR) | 50 nA at VR = 47.6 V - specifies leakage level below breakdown threshold |
| Non-repetitive Peak Power (PZSM) | 40 W at tp = 100 μs - supports transient overvoltage suppression capability |
| Junction-to-Ambient Rth | 380 K/W - defines thermal bottleneck for passive cooling in compact layouts |
Pinout & Package
Hermetically sealed axial-leaded glass package per SOD27 (DO-35) outline: 2 mm diameter body, 4.25 mm max length, 25.4 mm lead spacing, cathode identified by single black band near one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in reverse-bias operation | Connected to lower potential node when used as shunt regulator; carries forward current up to 250 mA |
| Cathode | Reverse breakdown terminal / high-voltage side in regulation mode | Marked with band; connected to input rail in shunt configuration; sustains 68 V reverse bias with <50 nA leakage |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables cost-effective voltage referencing where tight regulation is not critical, e.g., power supply feedback dividers |
| 40 W non-repetitive peak reverse power | Supports surge protection in low-energy transients without external series limiting resistor |
| SOD27 (DO-35) glass package | Provides hermetic sealing and proven reliability in industrial environments with −65 °C to +200 °C operating range |
| Positive temperature coefficient (+90 mV/K) | Allows predictable voltage drift compensation in temperature-sensitive analog circuits |
| Low reverse leakage (50 nA @ 47.6 V) | Minimizes quiescent current draw in battery-powered or high-impedance reference applications |
Applications
| Industrial Power Supply Feedback | Automotive ECU Reference |
|---|---|
Use Scenario: Shunt regulation in isolated flyback converter feedback loop using optocoupler-coupled TL431 replacement. IC Role / Device Role / Timing Role: Zener diode provides fixed 68 V reference to set primary-side overvoltage threshold. Use Value: Enables robust OVP detection without active IC, reducing BOM count and failure modes in harsh environments. | Use Scenario: Voltage clamp on 12 V CAN bus line during load dump events. IC Role / Device Role / Timing Role: Standby protection element absorbing short-duration 40 V surges above nominal bus voltage. Use Value: Limits transient energy to safe levels for downstream transceivers using only passive components. |
| Test Equipment Calibration Reference | Consumer Appliance Overvoltage Protection |
Use Scenario: Precision voltage reference in handheld multimeter front-end attenuator network. IC Role / Device Role / Timing Role: Stable 68 V node establishes known ratio for high-voltage measurement scaling. Use Value: Delivers repeatable accuracy over temperature due to predictable +90 mV/K drift and low dynamic impedance. | Use Scenario: Input rail clamping in AC-DC adapter secondary-side rectifier stage. IC Role / Device Role / Timing Role: Passive crowbar preventing capacitor overvoltage during no-load or open-circuit conditions. Use Value: Eliminates need for dedicated supervisor IC while maintaining EN61000-4-5 compliance margin. |
Availability
BZX79-C68,143 is available at Aetrix Electronics and suitable for industrial power supply feedback, automotive ECU reference, test equipment calibration reference, and consumer appliance overvoltage protection requiring stable component supply and long-term obsolescence management.
Supply support for BZX79-C68,143 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, designed specifically for cost-sensitive, low-power voltage regulation and clamping applications where ±5% tolerance and DO-35 package compatibility are prioritized.
FAQ
What is the maximum continuous power dissipation for BZX79-C68,143?
The BZX79-C68,143 has a maximum total power dissipation of 500 mW at ambient temperature of 50 °C with specified lead length and PCB mounting conditions. At higher ambient temperatures, derating applies per the thermal resistance of 380 K/W, and absolute maximum junction temperature must remain below +200 °C.
How is the cathode identified on the BZX79-C68,143 package?
The cathode is marked by a single black band located near one end of the DO-35 glass body. This band aligns with the cathode terminal in schematic symbols and must be oriented toward the higher-potential node when used in reverse-bias regulation or clamping configurations.
Does BZX79-C68,143 support surge protection applications?
Yes - it supports non-repetitive transient suppression with a peak reverse power rating of 40 W at 100 μs pulse width. This enables use in low-duty-cycle overvoltage clamping, such as load dump protection or ESD snubbing, provided average power remains within 500 mW limits.
What is the typical temperature coefficient for this Zener diode?
The typical temperature coefficient is +90 mV/K at 2 mA test current, indicating a positive drift of approximately 6.12 V per 100 °C rise. This value is consistent with avalanche-dominated breakdown behavior typical for Zeners above 6 V and allows predictable thermal compensation in reference designs.
BZX79-C68,143 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):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 400 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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-C68,143 FAQ
1.How can I place an order for BZX79-C68,143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79-C68,143 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-C68,143 reliable?
The price and inventory of BZX79-C68,143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79-C68,143 is usually 5 days.
3.What payment methods are accepted for BZX79-C68,143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79-C68,143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79-C68,143?
BZX79-C68,143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79-C68,143 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-C68,143?
For technical support, including BZX79-C68,143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79-C68,143 requirements.
6.How does Aetrix verify that BZX79-C68,143 is sourced from the original manufacturer or authorized distributors?
All BZX79-C68,143 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-C68,143 meets industry standards.
7.What is the process for return or replacement of BZX79-C68,143?
All BZX79-C68,143 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79-C68,143, 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-C68,143 part is unused and in its original packaging.
Return procedure for BZX79-C68,143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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