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onsemi BZX79C4V3
- Part No.:
- BZX79C4V3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C4V3.pdf
- Description:
- DIODE ZENER 4.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:8,839
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Product details
Overview
BZX79C4V3 from ON Semiconductor is a 4.3 V ±5% tolerance silicon Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 90 Ω dynamic impedance at 5 mA test current and 5 μA leakage current at 1 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog regulators and signal conditioning circuits.
For engineers reviewing the BZX79C4V3 datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal coefficient (−3.5 mV/°C), junction capacitance (160 pF at 0 V), maximum leakage, and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
The BZX79C4V3 operates as a two-terminal voltage-regulating device relying on controlled reverse-biased avalanche breakdown. Its −3.5 mV/°C temperature coefficient ensures predictable drift across −65°C to +200°C operating range, and its 90 Ω dynamic impedance at 5 mA supports stable regulation under moderate load variation.
Designed for DC voltage reference and transient suppression, it exhibits 1.5 V forward voltage max at 100 mA forward current and 160 pF junction capacitance at 0 V, making it suitable for low-frequency stabilization rather than RF bypassing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 4.0 V min / 4.6 V max at 5 mA - defines usable reference window for calibration-critical circuits |
| Power Dissipation | 500 mW @ TL ≤ 75°C - sets maximum continuous thermal load without heatsinking |
| Dynamic Impedance | 90 Ω @ IZ = 5 mA - determines output voltage stability under current step changes |
| Leakage Current | 5 μA max @ VR = 1 V - limits error current in high-impedance bias networks |
| Temp Coefficient | −3.5 mV/°C - enables predictable voltage drift compensation in temperature-varying environments |
| Junction Capacitance | 160 pF @ 0 V, 1 MHz - constrains use to sub-MHz signal paths to avoid phase shift |
| Forward Voltage | 1.5 V max @ IF = 100 mA - confirms standard silicon diode conduction behavior in series protection |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing or control signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias regulation; carries full load current during clamping |
| Cathode | Zener breakdown terminal / voltage reference node | Connected to higher-potential side; defines regulated output voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables direct replacement in legacy designs without recalibration of feedback dividers |
| DO-35 glass package | Provides hermetic sealing and proven reliability in industrial temperature cycling |
| −65°C to +200°C operating range | Supports deployment in under-hood automotive sensors and downhole instrumentation |
| 90 Ω dynamic impedance | Maintains <10 mV output deviation under ±1 mA load current variation at nominal bias |
| 1.5 V forward voltage max | Allows use as polarity-sensitive protection diode in series with supply rails |
Applications
| Low-Voltage Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 4.3 V reference for ADC biasing and op-amp level-shifting in battery-powered IoT sensor nodes. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing precise analog ground-referenced potential. Use Value: ±5% tolerance and −3.5 mV/°C TC enable <±20 mV total drift over 0–70°C ambient, sufficient for 10-bit system accuracy. | Use Scenario: Protecting microcontroller GPIO pins from ESD-induced transients in industrial HMI panels. IC Role / Device Role / Timing Role: Shunt clamping device diverting surge current above 4.6 V to ground before IC damage threshold. Use Value: 500 mW rating sustains 8 kV HBM ESD pulses when paired with 100 Ω series current-limiting resistor. |
| Linear Regulator Shunt | Signal Level Translation |
Use Scenario: Acting as shunt regulator for 5 V rail in low-quiescent-current LDO pre-regulation stage. IC Role / Device Role / Timing Role: Constant-voltage sink maintaining fixed headroom for downstream pass transistor gate drive. Use Value: 90 Ω Zz ensures <45 mV droop at ±0.5 mA load swing, preserving regulation margin for 3.3 V logic supply. | Use Scenario: Biasing phototransistor output in optocoupler-based isolated feedback loop. IC Role / Device Role / Timing Role: DC level translator setting collector pull-up reference point for saturated switching. Use Value: 160 pF capacitance introduces negligible delay in <100 kHz feedback bandwidth, avoiding loop instability. |
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 nominal, but 5% tolerance and 17 Ω Zz @ 49 mA - lower impedance at higher test current | Requires higher bias current (49 mA vs. 5 mA) to achieve spec; unsuitable for ultra-low-power designs | Select only when circuit can sustain ≥45 mA continuous Zener current and tighter regulation at high load is critical |
| BZX55C4V3 | Identical 4.3 V rating and DO-35 package, but 100 Ω Zz @ 5 mA and 10 μA IR @ 1 V - higher leakage and impedance | Acceptable where ±10% voltage tolerance is permitted and leakage sensitivity is low | Prefer for cost-sensitive replacements where 5 μA leakage and 90 Ω Zz are not design-critical |
Compared with 1N4733A and BZX55C4V3, the BZX79C4V3 offers optimal balance of low leakage (5 μA), moderate impedance (90 Ω), and minimal bias current requirement (5 mA), making it preferred for battery-operated and precision analog applications where power and stability are jointly constrained.
Availability
BZX79C4V3 is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage protection, linear regulator shunt, and signal level translation applications requiring stable component supply across industrial, automotive, and consumer electronics programs.
Supply support for BZX79C4V3 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 is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C4V3 belongs to the BZX79C2V4–BZX79C56 family of general-purpose Zener diodes engineered for reliable voltage regulation and transient suppression in cost-sensitive, high-volume applications.
FAQ
What is the Zener voltage tolerance for BZX79C4V3?
The BZX79C4V3 has a guaranteed Zener voltage range of 4.0 V minimum to 4.6 V maximum at 5 mA test current, corresponding to a ±5% tolerance about the nominal 4.3 V rating. This tolerance is specified per the ON Semiconductor datasheet Rev. 3 (November 2017) and applies under thermal equilibrium conditions at lead temperature TL = 30°C ± 1°C with 3/8" lead length. The BZX79C4V3 must be operated within this window to meet published regulation performance.
What is the maximum power dissipation of BZX79C4V3 and how does it derate with temperature?
The BZX79C4V3 is rated for 500 mW power dissipation at lead temperature TL ≤ 75°C with 3/8" lead length. Above 75°C, it derates linearly at 4.0 mW/°C, reaching zero dissipation at TL = 200°C. This derating curve is defined in the Absolute Maximum Ratings table and must be applied in thermal design to prevent junction overheating. The BZX79C4V3's thermal performance is validated for operation across −65°C to +200°C ambient storage and operating ranges.
Does BZX79C4V3 have a specified junction capacitance, and what is its value?
Yes, the BZX79C4V3 has a specified junction capacitance of 160 pF measured at 0 V reverse bias and 1 MHz frequency. This parameter is listed in the Electrical Characteristics table under "C (pF)" for the BZX79C4V3 row. The BZX79C4V3's capacitance impacts high-frequency noise filtering and signal integrity in AC-coupled circuits; designers should limit use to frequencies well below resonance with associated parasitics to avoid unintended filtering effects.
What is the temperature coefficient of BZX79C4V3 and how does it affect voltage stability?
The BZX79C4V3 has a temperature coefficient of −3.5 mV/°C, meaning its Zener voltage decreases by 3.5 mV for every 1°C rise in junction temperature. This coefficient is specified in the Electrical Characteristics table and applies across the full operating temperature range. For the BZX79C4V3, this negative TC enables predictable drift compensation in temperature-compensated reference designs and must be factored into total error budgets for precision applications.
Is BZX79C4V3 compatible with lead-free soldering processes?
Yes, the BZX79C4V3 in DO-35 glass package is compatible with standard lead-free reflow profiles, including JEDEC J-STD-020-compliant peak temperatures up to 260°C for 10 seconds. The glass body and axial leads withstand thermal shock without delamination or parameter shift. The BZX79C4V3's packaging and construction meet RoHS Directive 2011/65/EU requirements, and ON Semiconductor confirms full process compatibility in their packaging reliability reports.
BZX79C4V3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- 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 FAQ
1.How can I place an order for BZX79C4V3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C4V3 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 reliable?
The price and inventory of BZX79C4V3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C4V3 is usually 5 days.
3.What payment methods are accepted for BZX79C4V3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C4V3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C4V3?
BZX79C4V3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C4V3 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?
For technical support, including BZX79C4V3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C4V3 requirements.
6.How does Aetrix verify that BZX79C4V3 is sourced from the original manufacturer or authorized distributors?
All BZX79C4V3 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 meets industry standards.
7.What is the process for return or replacement of BZX79C4V3?
All BZX79C4V3 units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C4V3, 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 part is unused and in its original packaging.
Return procedure for BZX79C4V3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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