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onsemi BZX79C3V3_T50R
- Part No.:
- BZX79C3V3_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C3V3_T50R.pdf
- Description:
- DIODE ZENER 3.3V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:2,797
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Product details
Overview
BZX79C3V3_T50R from ON Semiconductor is a 3.3 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 precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the BZX79C3V3_T50R datasheet, pinout, applications, or equivalent options, key selection considerations include its 3.3 V nominal Zener voltage, 5 mA test current, 95 Ω impedance, -3.5 mV/°C TC, and DO-35 cathode-banded packaging - critical for stable biasing and clamping in sensor interfaces and regulator feedback paths.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 3.3 V reference across varying load and temperature conditions. Its -3.5 mV/°C temperature coefficient indicates predictable, linear voltage drift with ambient change, enabling compensation in precision analog designs.
With 25 μA maximum leakage current at 1 V reverse bias and 1.5 V forward voltage max at 100 mA, the BZX79C3V3_T50R supports bidirectional signal conditioning and dual-role (clamping + biasing) functions in compact DC rails where thermal stability and low leakage are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.1 V to 3.5 V at IZ = 5 mA - defines tight regulation window for 3.3 V system references |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous clamping energy without derating |
| Dynamic Impedance (ZZ) | 95 Ω @ IZ = 5 mA - determines output voltage variation under load transients |
| Temperature Coefficient (TC) | -3.5 mV/°C - enables predictable voltage drift correction in temperature-sensitive circuits |
| Leakage Current (IR) | 25 μA max @ VR = 1 V - ensures minimal parasitic loading on high-impedance nodes |
| Capacitance (C) | 200 pF @ VZ = 0, f = 1 MHz - impacts high-frequency noise filtering and AC coupling behavior |
Pinout & Package
DO-35 glass axial package with cathode indicated by a color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard axial lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground | Connected to lower-potential node in shunt regulation or clamping configuration |
| Cathode | Zener voltage reference terminal / Breakdown anode | Connected to regulated or protected node; marked by visible band on DO-35 body |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Ensures consistent 3.3 V reference across production lots without binning or calibration |
| DO-35 glass package | Provides hermetic sealing and stable long-term parametric performance in industrial environments |
| Low temperature coefficient (-3.5 mV/°C) | Minimizes voltage shift over -65°C to +200°C operating range for wide-temperature applications |
| 25 μA max leakage at 1 V | Preserves signal integrity in high-impedance sensor bias networks and battery-powered systems |
Applications
| Industrial Sensor Biasing | Microcontroller Reset Clamping |
|---|---|
Use Scenario: Providing stable 3.3 V bias to resistive bridge sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise excitation voltage for ratiometric measurement. Use Value: Tight 3.1–3.5 V tolerance and -3.5 mV/°C TC ensure <±1% total error across -40°C to +85°C operating range. | Use Scenario: Clamping reset line voltage to prevent false triggering during power-up sequencing in ARM Cortex-M0+ systems. IC Role / Device Role / Timing Role: Overvoltage protector limiting reset pin to safe 3.3 V level during supply ramp. Use Value: 95 Ω ZZ and 500 mW PD enable fast transient suppression without latch-up or thermal runaway. |
| Linear Regulator Feedback | ESD Protection Interface |
Use Scenario: Setting output voltage of adjustable LDOs (e.g., LM317-based) via resistor divider reference node. IC Role / Device Role / Timing Role: Precision voltage reference anchoring feedback loop setpoint. Use Value: Low 25 μA leakage avoids significant divider current error, preserving regulation accuracy to ±0.5%. | Use Scenario: Protecting RS-485 transceiver I/O pins against ±8 kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Low-capacitance (200 pF) shunt clamp diverting ESD current before IC damage. Use Value: 200 pF capacitance minimizes signal distortion on 10 Mbps differential bus lines while clamping to 3.5 V peak. |
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, but 10% tolerance and higher 100 Ω ZZ at 76 mA | Less suitable for precision biasing; better for general-purpose clamping with higher current capability | Select when cost sensitivity outweighs voltage accuracy and low-impedance requirements |
| MMSZ3V3 | SOD-123 surface-mount package, same 3.3 V/5%, but 350 mW PD and 100 Ω ZZ at 5 mA | Requires PCB redesign for SMT assembly; lower power rating limits surge handling | Choose for space-constrained boards where DO-35 axial leads are incompatible with layout |
Compared with 1N4728A and MMSZ3V3, the BZX79C3V3_T50R offers superior voltage accuracy (5% vs. 10%), lower dynamic impedance (95 Ω vs. 100 Ω), and higher power handling (500 mW vs. 350 mW), making it optimal for high-stability analog references where thermal robustness and parametric consistency are prioritized.
Availability
BZX79C3V3_T50R is available at Aetrix Electronics and suitable for industrial sensor biasing, microcontroller reset clamping, and linear regulator feedback applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for BZX79C3V3_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 manufacturer specializing in power management, analog, sensor, and discrete devices for automotive, industrial, and consumer markets.
The BZX79C series belongs to ON Semiconductor's legacy Zener diode product line, engineered for high-reliability voltage regulation and protection in cost-sensitive, thermally demanding applications.
FAQ
What is the nominal Zener voltage of BZX79C3V3_T50R?
The BZX79C3V3_T50R has a nominal Zener voltage of 3.3 V, with a guaranteed range of 3.1 V to 3.5 V at 5 mA test current and 25°C, reflecting its 5% tolerance specification per the ON Semiconductor datasheet.
What package type does BZX79C3V3_T50R use?
BZX79C3V3_T50R uses the DO-35 glass axial package, identified by a cathode band on the body and standardized 0.375-inch (3/8") lead length for through-hole mounting and thermal management.
What is the maximum power dissipation rating for BZX79C3V3_T50R?
The BZX79C3V3_T50R is rated for 500 mW power dissipation at lead temperature (TL) ≤ 75°C, with a linear derating of 4.0 mW/°C above that temperature - critical for thermal design in enclosed or high-ambient environments.
Does BZX79C3V3_T50R have a specified temperature coefficient?
Yes, the BZX79C3V3_T50R has a temperature coefficient of -3.5 mV/°C, meaning its Zener voltage decreases by 3.5 mV per degree Celsius rise in junction temperature - a key parameter for temperature-compensated reference designs.
What is the dynamic impedance of BZX79C3V3_T50R at its rated test current?
The dynamic impedance (ZZ) of BZX79C3V3_T50R is 95 Ω at IZ = 5 mA, indicating how tightly it maintains regulation under small-signal load variations - lower values reflect better voltage stability in precision applications.
BZX79C3V3_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):
- 3.3 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_T50R FAQ
1.How can I place an order for BZX79C3V3_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C3V3_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 BZX79C3V3_T50R reliable?
The price and inventory of BZX79C3V3_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C3V3_T50R is usually 5 days.
3.What payment methods are accepted for BZX79C3V3_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C3V3_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C3V3_T50R?
BZX79C3V3_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C3V3_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 BZX79C3V3_T50R?
For technical support, including BZX79C3V3_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C3V3_T50R requirements.
6.How does Aetrix verify that BZX79C3V3_T50R is sourced from the original manufacturer or authorized distributors?
All BZX79C3V3_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 BZX79C3V3_T50R meets industry standards.
7.What is the process for return or replacement of BZX79C3V3_T50R?
All BZX79C3V3_T50R units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C3V3_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 BZX79C3V3_T50R part is unused and in its original packaging.
Return procedure for BZX79C3V3_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C3V3_T50R Tags
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