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onsemi BZX79C4V3_T50R
- Part No.:
- BZX79C4V3_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C4V3_T50R.pdf
- Description:
- DIODE ZENER 4.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:5,175
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Product details
Overview
BZX79C4V3_T50R from ON Semiconductor is a 4.3 V, ±5% tolerance, 500 mW glass-passivated Zener diode in DO-35 package, designed for voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection circuits.
For engineers reviewing the BZX79C4V3_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy at 5 mA test current, dynamic impedance of 90 Ω max, temperature coefficient of −3.5 mV/°C, and leakage current ≤5 μA at 1 V reverse bias.
Technical Context
The BZX79C4V3_T50R operates as a two-terminal voltage reference device with sharp reverse breakdown at nominal 4.3 V. Its DO-35 axial glass package ensures stable thermal performance up to +200°C junction temperature and supports manual or wave soldering with 3/8″ lead length.
It exhibits a typical dynamic impedance (ZZ) of 90 Ω at IZ = 5 mA and a negative temperature coefficient (−3.5 mV/°C), indicating decreasing zener voltage with rising temperature - critical for thermal drift compensation in precision references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.0 V min / 4.6 V max at IZ = 5 mA - defines regulation window for stable reference generation |
| Tolerance | ±5% - enables predictable voltage clamping without post-selection trimming |
| Power Dissipation | 500 mW @ TL ≤ 75°C - sets maximum continuous dissipation in standard PCB mounting |
| Dynamic Impedance | 90 Ω max at IZ = 5 mA - determines output voltage stability under load variation |
| Leakage Current | ≤5 μA at VR = 1 V - ensures minimal standby current in battery-powered sensing nodes |
| Temp. Coefficient | −3.5 mV/°C - quantifies voltage drift per degree, enabling thermal error budgeting |
| Junction Temp. | −65°C to +200°C - supports operation in automotive under-hood and industrial control environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal polarity-sensitive circuitry beyond standard diode junction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connects to lower-potential node in reverse-biased regulation configuration |
| Cathode | Zener breakdown terminal | Marked with color band; connects to higher-potential node to enable controlled reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivation | Ensures long-term parameter stability and moisture resistance in humid environments |
| Low leakage current | ≤5 μA at 1 V reverse bias minimizes quiescent power loss in always-on circuits |
| Controlled tempco | −3.5 mV/°C allows predictable drift modeling for temperature-compensated designs |
| Standard DO-35 footprint | Enables drop-in replacement across legacy BZX79C family and compatibility with existing wave-solder tooling |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or buck-derived DC-DC converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Provides precise 4.3 V reference to TL431 or comparator input, setting regulated output threshold. Use Value: Tight ±5% tolerance and low dynamic impedance ensure <±1% output regulation accuracy across line/load/temperature. | Use Scenario: Protecting microcontroller GPIO pins from transient overvoltage events on industrial I/O lines. IC Role / Device Role / Timing Role: Acts as shunt clamp, conducting excess energy when input exceeds 4.3 V to limit voltage stress on downstream ICs. Use Value: Fast response and 500 mW surge capability absorb short-duration transients without degradation. |
| Reference Voltage Source | Signal Level Shifting |
Use Scenario: Generating stable bias voltage for op-amp comparators or ADC reference inputs in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Supplies fixed 4.3 V reference to analog front-end components requiring low-drift DC offset. Use Value: −3.5 mV/°C tempco and 90 Ω impedance support sub-0.5% total error over −40°C to +85°C. | Use Scenario: Translating 5 V logic signals to 4.3 V compatible levels for interfacing with older 4.5 V tolerant peripherals. IC Role / Device Role / Timing Role: Functions as passive level translator using forward-biased anode connection and zener-clamped cathode. Use Value: Enables bidirectional level shifting without active components while maintaining signal integrity at <10 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4733A | Same 5.1 V rating not applicable; correct alternative is 1N4731A (4.3 V, ±5%, DO-41, 1 W) | Higher power rating (1 W vs. 0.5 W) and larger DO-41 package | Prefer when higher surge handling or board space permits larger footprint |
| BZX55C4V3 | Same 4.3 V, ±5%, but in DO-35 package with 500 mW rating and 100 Ω max ZZ | Nearly identical electrical specs; minor ZZ difference (90 Ω vs. 100 Ω) | Valid functional alternative where slightly higher impedance is acceptable |
Compared with BZX79C4V3_T50R, the 1N4731A offers higher power margin but requires layout change, while BZX55C4V3 matches form factor and function closely with negligible impedance trade-off - making it the most direct substitute for space-constrained designs.
Availability
BZX79C4V3_T50R is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and reference voltage source applications requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for BZX79C4V3_T50R 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
ON Semiconductor (now part of onsemi) is a global semiconductor supplier specializing in energy-efficient power, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C series was engineered for general-purpose voltage regulation and reference use in cost-sensitive, high-reliability applications - emphasizing tight tolerance, stable tempco, and robust DO-35 packaging for broad manufacturability.
FAQ
What is the nominal zener voltage and tolerance of the BZX79C4V3_T50R?
The BZX79C4V3_T50R has a nominal zener voltage of 4.3 V with a tolerance of ±5%, specified at test current IZ = 5 mA. This means its actual breakdown voltage falls between 4.0 V and 4.6 V under standard conditions, enabling reliable voltage clamping in regulation circuits without calibration.
What is the maximum power dissipation and derating behavior of the BZX79C4V3_T50R?
The BZX79C4V3_T50R is rated for 500 mW maximum power dissipation at lead temperature TL ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C - meaning usable power drops to 400 mW at 100°C lead temperature, critical for thermal design in enclosed enclosures.
What is the dynamic impedance of the BZX79C4V3_T50R and why does it matter?
The BZX79C4V3_T50R has a maximum dynamic impedance (ZZ) of 90 Ω at IZ = 5 mA. This value reflects how much the zener voltage changes with current variation - lower ZZ yields tighter regulation under varying load, directly impacting output stability in feedback and reference applications.
How is the cathode identified on the BZX79C4V3_T50R DO-35 package?
The cathode of the BZX79C4V3_T50R is marked by a distinct color band on the glass body of the DO-35 package. This band must be oriented toward the higher-potential side of the circuit during reverse-bias operation to enable proper zener breakdown and voltage regulation functionality.
What is the temperature coefficient of the BZX79C4V3_T50R and how does it affect circuit performance?
The BZX79C4V3_T50R has a temperature coefficient of −3.5 mV/°C, indicating its zener voltage decreases by approximately 3.5 mV per degree Celsius rise in junction temperature. This predictable drift must be accounted for in precision references, especially over wide ambient ranges like −40°C to +125°C.
BZX79C4V3_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 4.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 90 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 100 mA
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
BZX79C4V3_T50R FAQ
1.How can I place an order for BZX79C4V3_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C4V3_T50R 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 BZX79C4V3_T50R reliable?
The price and inventory of BZX79C4V3_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C4V3_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C4V3_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C4V3_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C4V3_T50R?
BZX79C4V3_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C4V3_T50R 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 BZX79C4V3_T50R?
For technical support, including BZX79C4V3_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C4V3_T50R requirements.
6.How does Aetrix verify that BZX79C4V3_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C4V3_T50R 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 BZX79C4V3_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C4V3_T50R?
All BZX79C4V3_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C4V3_T50R, 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 BZX79C4V3_T50R part is unused and in its original packaging.
Return procedure for BZX79C4V3_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C4V3_T50R Tags
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