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onsemi BZX79C3V0_T50A
- Part No.:
- BZX79C3V0_T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C3V0_T50A.pdf
- Description:
- DIODE ZENER 3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,907
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Product details
Overview
BZX79C3V0_T50A from ON Semiconductor is a 3.0 V ±5% Zener diode in DO-35 glass package, rated for 500 mW power dissipation at TL ≤ 75°C, with 95 Ω dynamic impedance at 5 mA test current and -3.5 mV/°C temperature coefficient. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.
For engineers reviewing the BZX79C3V0_T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal coefficient, dynamic impedance at nominal test current, leakage current at rated reverse voltage, and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
This device operates in reverse-biased breakdown mode to maintain stable voltage regulation across varying load currents. Its -3.5 mV/°C temperature coefficient indicates predictable negative drift with rising junction temperature, enabling compensation-aware designs.
The 95 Ω dynamic impedance at IZ = 5 mA defines output impedance under regulation, directly affecting ripple rejection and load regulation error. Maximum leakage current of 50 μA at VR = 1.0 V ensures minimal standby power loss in battery-powered sensing nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V ±5% at IZ = 5 mA - defines nominal regulation point with guaranteed accuracy band for reference stability |
| Dynamic Impedance (ZZ) | 95 Ω max at IZ = 5 mA - determines voltage deviation under load current changes; lower values improve regulation fidelity |
| Temperature Coefficient (TC) | -3.5 mV/°C - quantifies voltage drift per degree Celsius; enables thermal error budgeting in precision circuits |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous thermal limit; derates 4.0 mW/°C above 75°C ambient lead temperature |
| Leakage Current (IR) | 50 μA max at VR = 1.0 V - specifies off-state conduction; critical for low-power sleep-mode integrity |
| Junction Temperature Range | -65°C to +200°C - supports operation in extended industrial and automotive under-hood environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower potential node; reverse voltage applied between cathode and anode to activate regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Marked end of DO-35 body; delivers regulated 3.0 V when reverse biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables use in cost-sensitive applications where tight regulation is required without laser trimming |
| -3.5 mV/°C temperature coefficient | Allows predictable thermal drift modeling for compensated reference designs in wide-temperature environments |
| 500 mW power rating in DO-35 | Provides higher power handling than SOD-123 alternatives while retaining through-hole manufacturability |
| 95 Ω dynamic impedance at 5 mA | Delivers better line/load regulation than higher-impedance Zeners in feedback networks of LDOs or op-amp references |
| DO-35 glass package with cathode band | Ensures visual polarity identification and compatibility with legacy wave-solder and hand-solder processes |
Applications
| Low-Voltage Reference | Overvoltage Clamp |
|---|---|
|
Use Scenario: Providing stable 3.0 V reference for ADC biasing or comparator threshold in sensor front-ends. IC Role / Device Role / Timing Role: Voltage reference element establishing precise DC operating point for analog signal chain components. Use Value: ±5% tolerance and -3.5 mV/°C TC enable sub-10 mV total error over -40°C to +85°C without calibration. |
Use Scenario: Protecting microcontroller GPIO pins from transient overvoltage during ESD events or inductive switching. IC Role / Device Role / Timing Role: Shunt protection device clamping input voltage to 3.0 V before damage threshold of downstream logic. Use Value: 500 mW rating absorbs short-duration transients; 95 Ω ZZ ensures fast response to voltage spikes above 3.0 V. |
| Current Source Bias | Power Supply Monitoring |
|
Use Scenario: Setting constant bias current for LED drivers or transistor amplifiers using resistor-Zener configuration. IC Role / Device Role / Timing Role: Stable voltage drop enabling predictable current through series resistor in two-terminal current source topology. Use Value: Low dynamic impedance maintains current stability despite supply variation; DO-35 allows manual prototyping and repair. |
Use Scenario: Detecting brown-out conditions in 3.3 V systems by comparing supply against 3.0 V Zener-regulated threshold. IC Role / Device Role / Timing Role: Analog voltage threshold detector feeding comparator input in power-good monitoring circuits. Use Value: Tight 3.0 V ±5% tolerance ensures accurate trip point; 50 μA IR minimizes loading on monitored rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4723 | 3.3 V nominal, ±5%, 1.0 W rating, DO-41 package | Higher power and different voltage; requires PCB footprint change and thermal layout review | Select when >500 mW surge capability is needed and DO-41 mounting is acceptable |
| BZX55C3V0 | 3.0 V ±5%, 500 mW, DO-35, but 120 Ω ZZ at 5 mA and -2.5 mV/°C TC | Slightly higher impedance and less negative TC reduce regulation accuracy in precision references | Acceptable for non-critical clamping where tighter TC or lower ZZ is not required |
Compared with BZX79C3V0_T50A, 1N4723 offers higher power but requires larger DO-41 footprint and lacks matching thermal coefficient, while BZX55C3V0 shares the DO-35 form factor but trades 25 Ω higher dynamic impedance and reduced thermal predictability-making BZX79C3V0_T50A preferable for stable low-drift references.
Availability
BZX79C3V0_T50A is available at Aetrix Electronics and suitable for low-voltage reference design, overvoltage protection, current-source biasing, and power-supply monitoring applications requiring stable component supply and long-term obsolescence resilience.
Supply support for BZX79C3V0_T50A 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 onsemi) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C series was designed for general-purpose voltage regulation and reference applications in cost-sensitive, high-volume electronics where reliability, consistency, and DO-35 manufacturability are essential.
FAQ
What is the nominal Zener voltage and tolerance of the BZX79C3V0_T50A?
The BZX79C3V0_T50A has a nominal Zener voltage of 3.0 V with a tolerance of ±5%, measured at a test current of 5 mA and lead temperature of 30°C ±1°C. This specification ensures the actual breakdown voltage falls between 2.85 V and 3.15 V under defined conditions, making it suitable for applications requiring moderate voltage accuracy without active calibration.
What is the maximum power dissipation rating for the BZX79C3V0_T50A?
The BZX79C3V0_T50A is rated for 500 mW maximum power dissipation at a lead temperature (TL) of 75°C or below. Above 75°C, it must be derated linearly at 4.0 mW/°C. This thermal limit reflects its DO-35 glass package construction and defines safe continuous operation in ambient environments up to approximately 60°C with standard PCB copper pour.
What is the dynamic impedance of the BZX79C3V0_T50A and why does it matter?
The BZX79C3V0_T50A exhibits a maximum dynamic impedance (ZZ) of 95 Ω at IZ = 5 mA. This parameter quantifies how much the Zener voltage changes with small variations in current-lower ZZ improves regulation stability under varying load conditions. In practice, this enables tighter voltage control in feedback loops and reference circuits compared to higher-impedance Zeners.
How is polarity identified on the BZX79C3V0_T50A DO-35 package?
The BZX79C3V0_T50A uses a cathode band-a visible color ring near one end of the DO-35 glass body-to indicate the cathode terminal. The unmarked end is the anode. This marking aligns with industry-standard DO-35 conventions and ensures correct orientation during placement, especially critical in shunt regulation and clamping configurations where reverse bias must be applied.
What is the temperature coefficient of the BZX79C3V0_T50A and how does it affect performance?
The BZX79C3V0_T50A 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 predictable negative drift allows designers to model and compensate for thermal effects in precision reference circuits, distinguishing it from higher-voltage Zeners that may exhibit positive coefficients.
BZX79C3V0_T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 50 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
BZX79C3V0_T50A FAQ
1.How can I place an order for BZX79C3V0_T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C3V0_T50A 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 BZX79C3V0_T50A reliable?
The price and inventory of BZX79C3V0_T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C3V0_T50A is usually 5 days.
3.What payment methods are accepted for BZX79C3V0_T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C3V0_T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C3V0_T50A?
BZX79C3V0_T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C3V0_T50A 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 BZX79C3V0_T50A?
For technical support, including BZX79C3V0_T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C3V0_T50A requirements.
6.How does Aetrix verify that BZX79C3V0_T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C3V0_T50A 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 BZX79C3V0_T50A meets industry standards.
7.What is the process for return or replacement of BZX79C3V0_T50A?
All BZX79C3V0_T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C3V0_T50A, 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 BZX79C3V0_T50A part is unused and in its original packaging.
Return procedure for BZX79C3V0_T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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