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onsemi BZX79C3V0_T50R
- Part No.:
- BZX79C3V0_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C3V0_T50R.pdf
- Description:
- DIODE ZENER 3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:9,322
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Product details
Overview
BZX79C3V0_T50R from ON Semiconductor is a 3.0 V, ±5% tolerance 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 - used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the BZX79C3V0_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal stability, leakage current (≤100 μA at 1 V), junction capacitance (215 pF at 0 V), and DO-35 mechanical compatibility in space-constrained PCB layouts.
Technical Context
The BZX79C3V0_T50R operates as a silicon planar Zener diode optimized for stable voltage reference in reverse-biased mode. Its -3.5 mV/°C temperature coefficient indicates predictable negative drift over temperature, and its 95 Ω dynamic impedance at 5 mA ensures tight regulation under small-signal load variations.
Designed for operation up to +200°C junction temperature and down to -65°C storage, it supports industrial environments where thermal cycling and long-term stability are critical. The DO-35 glass package provides hermetic sealing and reliable cathode band identification per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V nominal, min 2.8 V / max 3.2 V - defines precise clamping threshold for 3.3 V rail protection or biasing |
| Tolerance | ±5% - enables consistent performance across production batches without binning |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling in leaded through-hole layout |
| Dynamic Impedance (ZZ) | 95 Ω @ IZ = 5 mA - determines output voltage variation under changing load current |
| Temperature Coefficient (TC) | -3.5 mV/°C - quantifies voltage drift magnitude per degree Celsius rise in junction temperature |
| Junction Capacitance (CJ) | 215 pF @ VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and AC coupling behavior |
| Leakage Current (IR) | ≤100 μA @ VR = 1 V - limits standby power loss in always-on reference circuits |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; leads are tinned copper alloy, 3/8″ length specified for thermal derating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common when used as shunt regulator; defines polarity for reverse-bias operation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to supply rail being stabilized; voltage develops across cathode-to-anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Stable Zener voltage at low current | Specified at 5 mA - enables accurate regulation even in micro-power designs |
| Negative temperature coefficient | -3.5 mV/°C - allows predictable compensation in temperature-sensitive references |
| Low leakage current | ≤100 μA at 1 V reverse bias - minimizes quiescent current in battery-powered systems |
| Hermetic DO-35 package | Glass-sealed axial construction - ensures long-term reliability in humid or corrosive environments |
| Wide operating temperature range | -65°C to +200°C - supports deployment in automotive under-hood and industrial control applications |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Providing stable 3.0 V reference for ADC biasing or op-amp feedback networks in embedded sensor nodes. IC Role / Device Role / Timing Role: Shunt voltage reference diode maintaining fixed potential relative to ground. Use Value: Enables <±10 mV reference error over temperature due to tight 5% tolerance and known TC. | Use Scenario: Protecting 3.3 V GPIO pins from transient overvoltage events exceeding 3.6 V. IC Role / Device Role / Timing Role: Reverse-biased clamping element diverting surge current away from sensitive input structures. Use Value: Limits pin voltage to ≤3.2 V (max VZ) while absorbing up to 500 mW peak energy. |
| Low-Cost Analog Signal Conditioning | Current Source Biasing in Discrete Amplifiers |
Use Scenario: Setting bias point for emitter-follower stages in audio preamplifiers requiring stable DC offset. IC Role / Device Role / Timing Role: Fixed-voltage node generator establishing base-emitter differential in BJT circuits. Use Value: Delivers repeatable 3.0 V reference with <95 Ω output impedance for minimal signal perturbation. | Use Scenario: Establishing constant current through collector load resistors in discrete RF amplifier bias networks. IC Role / Device Role / Timing Role: Voltage-controlled current source element via series resistor configuration. Use Value: Maintains current stability within ±5% across ambient temperature shifts using known TC behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | 3.3 V nominal, ±5%, 1.0 W power rating, DO-41 package | Higher power handling but larger footprint; less suitable for space-constrained DO-35 layouts | Select when >500 mW dissipation or higher surge robustness is required |
| BZX55C3V0 | 3.0 V nominal, ±5%, 500 mW, DO-35 package, 100 Ω ZZ @ 5 mA | Nearly identical electrical specs but different manufacturer marking and minor process variation | Drop-in replacement where ON Semi sourcing is constrained; verify batch-level TC consistency |
Compared with BZX79C3V0_T50R, the 1N4728A offers higher power but requires PCB redesign for DO-41, while the BZX55C3V0 matches form, fit, and function closely - making it the preferred alternative for footprint-consistent upgrades.
Availability
BZX79C3V0_T50R is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and analog biasing applications requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for BZX79C3V0_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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.
The BZX79C series belongs to ON Semiconductor's general-purpose Zener diode product line, designed specifically for cost-sensitive, high-reliability voltage regulation and clamping in consumer, industrial, and computing systems.
FAQ
What is the nominal Zener voltage of the BZX79C3V0_T50R?
The BZX79C3V0_T50R has a nominal Zener voltage of 3.0 V, with a guaranteed range of 2.8 V to 3.2 V at 5 mA test current and 25°C ambient. This value is defined in the ON Semiconductor datasheet BZX79C2V4/D Rev. 3 and applies directly to the BZX79C3V0_T50R variant.
What is the maximum power dissipation rating for the BZX79C3V0_T50R?
The BZX79C3V0_T50R is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C with 3/8″ lead length. It derates linearly at 4.0 mW/°C above that temperature, reaching zero dissipation at 200°C junction temperature.
Does the BZX79C3V0_T50R have a positive or negative temperature coefficient?
The BZX79C3V0_T50R has a negative temperature coefficient of -3.5 mV/°C, meaning its Zener voltage decreases predictably as junction temperature increases. This behavior is confirmed in the Electrical Characteristics table of the official ON Semiconductor datasheet.
What package type is used for the BZX79C3V0_T50R?
The BZX79C3V0_T50R uses the DO-35 glass axial package with cathode identified by a color band. This hermetically sealed package meets JEDEC standards and is specified in the "Top Mark Information" section of the BZX79C2V4/D datasheet.
What is the dynamic impedance of the BZX79C3V0_T50R at its rated test current?
The BZX79C3V0_T50R exhibits a dynamic impedance (ZZ) of 95 Ω at IZ = 5 mA and TA = 25°C. This value reflects the slope of the V-I curve in breakdown and directly affects regulation precision under varying load conditions.
BZX79C3V0_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):
- 3 V
- Tolerance:
- ±7%
- 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_T50R FAQ
1.How can I place an order for BZX79C3V0_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C3V0_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 BZX79C3V0_T50R reliable?
The price and inventory of BZX79C3V0_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C3V0_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C3V0_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C3V0_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C3V0_T50R?
BZX79C3V0_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C3V0_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 BZX79C3V0_T50R?
For technical support, including BZX79C3V0_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C3V0_T50R requirements.
6.How does Aetrix verify that BZX79C3V0_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C3V0_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 BZX79C3V0_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C3V0_T50R?
All BZX79C3V0_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C3V0_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 BZX79C3V0_T50R part is unused and in its original packaging.
Return procedure for BZX79C3V0_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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