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onsemi BZX79C3V3-T50A
- Part No.:
- BZX79C3V3-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C3V3-T50A.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:10,708
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Product details
Overview
BZX79C3V3-T50A from ON Semiconductor is a 3.3 V, 5% tolerance, 500 mW DO-35 glass-encapsulated Zener diode optimized for voltage regulation and reference applications in low-power analog circuits, power supply feedback loops, and overvoltage protection stages.
For engineers reviewing the BZX79C3V3-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy at 5 mA test current, 95 Ω dynamic impedance, -3.5 mV/°C temperature coefficient, and DO-35 package compatibility with through-hole PCB assembly and thermal derating above 75°C.
Technical Context
This device operates as a two-terminal silicon junction diode with controlled reverse-breakdown behavior. Its zener voltage is specified at IZ = 5 mA, with leakage current limited to 25 μA at VR = 1 V and forward voltage ≤1.5 V at IF = 100 mA.
The BZX79C3V3-T50A exhibits a negative temperature coefficient of -3.5 mV/°C and junction capacitance of 200 pF at VZ = 0 V, f = 1 MHz - characteristics critical for stable DC biasing and low-frequency reference stability in industrial sensor interfaces and linear regulator circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.1 V to 3.5 V at IZ = 5 mA - defines precise clamping threshold for 3.3 V rail regulation |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - supports continuous operation in compact through-hole layouts with 3/8″ lead length |
| Dynamic Impedance (ZZ) | 95 Ω max at IZ = 5 mA - determines output voltage variation under load transients in feedback networks |
| Temperature Coefficient (TC) | -3.5 mV/°C - enables predictable drift compensation in temperature-sensitive references |
| Junction Capacitance (CJ) | 200 pF at VZ = 0 V, f = 1 MHz - impacts high-frequency noise coupling in filtering and bypass applications |
| Leakage Current (IR) | 25 μA max at VR = 1 V - ensures minimal quiescent current draw in battery-powered monitoring circuits |
Pinout & Package
DO-35 glass axial package with cathode band marking; leads are unassigned (two-terminal device); polarity identified by single black band at cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground node | Connected to circuit common or lower-potential side in shunt regulation configurations |
| Cathode | Zener voltage reference terminal / Input node for regulated output | Connected to input voltage source; output voltage referenced to anode potential |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures consistent clamping performance across production batches without calibration |
| DO-35 glass package | Provides hermetic sealing and thermal stability for operation from -65°C to +200°C ambient |
| Negative TC (-3.5 mV/°C) | Compensates for positive TC of other components in precision voltage references |
| Low leakage (25 μA @ 1 V) | Minimizes standby power loss in always-on sensing and monitoring systems |
| 500 mW power rating | Supports robust transient suppression in 3.3 V logic supply lines without external heatsinking |
Applications
| Power Supply Feedback | Sensor Bias Reference |
|---|---|
|
Use Scenario: Regulating output voltage in discrete linear regulators or optocoupler-based SMPS feedback paths. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.3 V setpoint for error amplifier comparison. Use Value: Maintains ±2% output regulation over line/load variations due to tight VZ tolerance and low ZZ. |
Use Scenario: Providing excitation voltage for resistive temperature detectors (RTDs) or bridge sensors. IC Role / Device Role / Timing Role: Low-drift, low-noise DC bias source replacing higher-cost precision references. Use Value: Delivers stable 3.3 V bias with <±0.5% drift over 0–70°C, enabled by matched TC and low CJ. |
| Overvoltage Clamp | Logic-Level Protection |
|
Use Scenario: Protecting microcontroller I/O pins against ESD or inductive kickback in industrial control modules. IC Role / Device Role / Timing Role: Fast-acting shunt clamp limiting voltage to 3.5 V maximum during transients. Use Value: Clamps 1 kV/μs surges within 10 ns while dissipating <500 mW peak energy per event. |
Use Scenario: Level-shifting and clamping between 5 V and 3.3 V logic domains in mixed-voltage digital systems. IC Role / Device Role / Timing Role: Bidirectional voltage limiter preventing damage to 3.3 V CMOS inputs. Use Value: Limits input to 3.5 V while drawing <1 μA at 3.0 V - preserving signal integrity and drive strength. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4728A | Same 3.3 V nominal VZ, but 10% tolerance and 1 W power rating in DO-41 package | Higher power handling; less precise voltage control | Select when thermal margin >500 mW is required and ±10% VZ is acceptable |
| BZX55C3V3 | Same 3.3 V / 5% spec, but 500 mW in DO-35 with higher ZZ (100 Ω) and +2 mV/°C TC | Less stable temperature drift; slightly higher regulation error under load | Choose only if BZX79C3V3-T50A is unavailable and tighter TC is not critical |
Compared with 1N4728A and BZX55C3V3, the BZX79C3V3-T50A offers superior voltage accuracy and temperature stability in the same DO-35 footprint, making it preferred for precision analog references where drift and regulation error must be minimized.
Availability
BZX79C3V3-T50A is available at Aetrix Electronics and suitable for power supply feedback, sensor bias reference, overvoltage clamp, and logic-level protection requiring stable component supply and long-term obsolescence management.
Supply support for BZX79C3V3-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 management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The BZX79C3V3-T50A belongs to the BZX79C series of general-purpose Zener diodes designed for cost-sensitive, high-reliability voltage regulation and reference applications in consumer, industrial, and computing equipment.
FAQ
What is the zener voltage tolerance of the BZX79C3V3-T50A?
The BZX79C3V3-T50A has a zener voltage tolerance of ±5%, meaning its breakdown voltage falls between 3.1 V and 3.5 V when measured at IZ = 5 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table of the official ON Semiconductor datasheet (BZX79C2V4/D, Rev. 3). The BZX79C3V3-T50A maintains this specification across its qualified operating temperature range.
What package type does the BZX79C3V3-T50A use?
The BZX79C3V3-T50A uses a DO-35 glass axial package with a cathode band marking, as explicitly stated in the "Absolute Maximum Ratings" section and illustrated in the mechanical drawings of the ON Semiconductor datasheet. This package supports lead-free soldering and meets JEDEC standards for through-hole mounting. The BZX79C3V3-T50A's DO-35 form factor ensures compatibility with legacy board designs and automated insertion equipment.
What is the maximum power dissipation for the BZX79C3V3-T50A?
The BZX79C3V3-T50A has a maximum power dissipation of 500 mW at lead temperature (TL) ≤ 75°C with 3/8″ lead length, and derates at 4.0 mW/°C above that temperature. This value is specified in the Absolute Maximum Ratings table and verified under thermal equilibrium conditions. The BZX79C3V3-T50A's power rating enables reliable operation in compact PCB layouts without forced air cooling.
Does the BZX79C3V3-T50A have a positive or negative temperature coefficient?
The BZX79C3V3-T50A has a negative temperature coefficient of -3.5 mV/°C, meaning its zener voltage decreases by 3.5 mV per degree Celsius rise in junction temperature. This value is listed in the Electrical Characteristics table for all devices from BZX79C2V4 through BZX79C3V9. The BZX79C3V3-T50A's negative TC allows it to compensate for positive TC elements in precision reference circuits.
What is the dynamic impedance of the BZX79C3V3-T50A at its rated test current?
The BZX79C3V3-T50A has a maximum dynamic impedance (ZZ) of 95 Ω at IZ = 5 mA and TA = 25°C, as specified in the Electrical Characteristics table. This parameter directly affects regulation accuracy under varying load conditions. The BZX79C3V3-T50A's ZZ value ensures minimal output voltage deviation in feedback and reference applications where current stability is critical.
BZX79C3V3-T50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 25 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
BZX79C3V3-T50A FAQ
1.How can I place an order for BZX79C3V3-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C3V3-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 BZX79C3V3-T50A reliable?
The price and inventory of BZX79C3V3-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C3V3-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C3V3-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C3V3-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C3V3-T50A?
BZX79C3V3-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C3V3-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 BZX79C3V3-T50A?
For technical support, including BZX79C3V3-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C3V3-T50A requirements.
6.How does Aetrix verify that BZX79C3V3-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C3V3-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 BZX79C3V3-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C3V3-T50A?
All BZX79C3V3-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C3V3-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 BZX79C3V3-T50A part is unused and in its original packaging.
Return procedure for BZX79C3V3-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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