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onsemi BZX79C11-T50A
- Part No.:
- BZX79C11-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C11-T50A.pdf
- Description:
- DIODE ZENER 11V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:14,985
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Product details
Overview
BZX79C11-T50A from ON Semiconductor is a 11 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 circuits.
For engineers reviewing the BZX79C11-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy (10.4–11.6 V), dynamic impedance (8 Ω @ 5 mA), leakage current (0.1 µA @ 8.5 V), and thermal coefficient (+5.4 mV/°C) - all critical for stable reference design under varying temperature and load conditions.
Technical Context
The BZX79C11-T50A operates as a silicon planar Zener diode with controlled reverse breakdown at precisely defined voltage. Its junction is thermally stabilized via 3/8″ lead length and rated for operation from −65°C to +200°C.
It delivers 11 V nominal regulation at 5 mA test current, with 8 Ω dynamic impedance ensuring minimal output variation under load transients, and exhibits a positive temperature coefficient of +5.4 mV/°C - enabling predictable drift compensation in precision references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.4 V min to 11.6 V max @ IZ = 5 mA - defines usable regulation window for feedback or clamp design |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - sets maximum continuous power handling in standard PCB mounting |
| Dynamic Impedance (ZZ) | 8 Ω max @ IZ = 5 mA - determines output voltage stability under small-signal load changes |
| Leakage Current (IR) | 0.1 µA max @ VR = 8.5 V - ensures minimal error current in high-impedance reference nodes |
| Temperature Coefficient (TC) | +5.4 mV/°C - quantifies voltage drift per degree Celsius for thermal error budgeting |
| Junction Temperature Range | −65°C to +200°C - supports operation in automotive under-hood and industrial environments |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device requiring no orientation-specific PCB footprint beyond standard 0.4 mm wire diameter lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node in reverse-bias regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated node; marked by color band on DO-35 body |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables use without post-calibration in cost-sensitive voltage reference designs |
| Low dynamic impedance (8 Ω) | Maintains <±10 mV regulation shift across 1–10 mA load range |
| Stable +5.4 mV/°C TC | Allows predictable thermal drift modeling in temperature-compensated references |
| DO-35 glass package | Provides hermetic sealing and long-term parameter stability in humid or corrosive environments |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in TL431-based adjustable SMPS feedback networks to set precise output voltage. IC Role / Device Role / Timing Role: Provides stable 11 V reference point for optocoupler biasing and error amplifier input. Use Value: Tight 5% VZ tolerance and low ZZ minimize output voltage drift across line/load/temperature. | Use Scenario: Placed across microcontroller I/O pins to limit transient overvoltage during ESD events. IC Role / Device Role / Timing Role: Acts as shunt clamping element diverting surge current above 11 V threshold. Use Value: Sub-µA leakage at 8.5 V prevents signal degradation; fast response protects CMOS inputs. |
| Temperature-Stable Voltage Reference | Low-Power Sensor Biasing |
Use Scenario: Supplies excitation voltage to precision RTD or bridge sensors in industrial transmitters. IC Role / Device Role / Timing Role: Serves as primary DC reference source for ADC front-end conditioning circuitry. Use Value: +5.4 mV/°C TC enables first-order thermal compensation when paired with NTC thermistors. | Use Scenario: Biases photodiode or MEMS sensor analog front-end in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Delivers low-noise, low-drift bias voltage to high-impedance sensor elements. Use Value: 0.1 µA max leakage avoids loading sensitive sensor outputs; DO-35 package supports compact layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4740A | 10 V nominal, 5% tolerance, 1 W power rating, DO-41 package | Higher power handling but larger footprint; higher leakage (5 µA @ 7.6 V) | Prefer for higher-power regulation where board space allows DO-41 |
| MMSZ5240B | 10 V nominal, 5% tolerance, SOD-123 surface-mount package, 500 mW | Same power rating but requires rework for through-hole replacement; lower ZZ (17 Ω) | Choose for automated assembly or space-constrained PCBs needing 10 V reference |
Compared with 1N4740A and MMSZ5240B, the BZX79C11-T50A offers a unique combination of 11 V nominal voltage, DO-35 hermetic packaging, and +5.4 mV/°C TC - making it preferred for temperature-aware analog references where exact 11 V regulation and long-term stability are required.
Availability
BZX79C11-T50A is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and precision voltage reference applications requiring stable component supply across industrial, automotive, and instrumentation programs.
Supply support for BZX79C11-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 part of onsemi) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The BZX79C series was designed specifically for general-purpose voltage regulation and reference functions in cost-sensitive, reliability-critical analog circuits - emphasizing tight tolerance, stable TC, and robust DO-35 packaging.
FAQ
What is the nominal Zener voltage of the BZX79C11-T50A?
The BZX79C11-T50A has a nominal Zener voltage of 11 V, with a guaranteed range of 10.4 V to 11.6 V at 5 mA test current and 25°C ambient. This 5% tolerance is specified per the ON Semiconductor datasheet Rev. 3 (November 2017), and the BZX79C11-T50A maintains this specification across its full operating temperature range when properly mounted with 3/8″ lead length.
What package type does the BZX79C11-T50A use?
The BZX79C11-T50A uses the DO-35 glass axial package, identified by a cathode color band and standardized 0.4 mm diameter leads. This hermetically sealed package provides superior long-term parameter stability and moisture resistance compared to plastic-packaged Zeners, and the BZX79C11-T50A's marking consists of "LOGO", "9C", and "11" across three lines per ON Semiconductor top-marking specification.
What is the maximum power dissipation for the BZX79C11-T50A?
The BZX79C11-T50A has a maximum power dissipation of 500 mW at lead temperature (TL) ≤ 75°C with 3/8″ lead length. It derates linearly at 4.0 mW/°C above 75°C, reaching zero dissipation at 200°C junction temperature. This rating is confirmed in the Absolute Maximum Ratings table of the official BZX79C2V4–BZX79C56 datasheet, and the BZX79C11-T50A must be operated within these thermal limits to ensure reliability.
Does the BZX79C11-T50A have a positive or negative temperature coefficient?
The BZX79C11-T50A has a positive temperature coefficient of +5.4 mV/°C, meaning its Zener voltage increases predictably with rising temperature. This value is explicitly listed in the Electrical Characteristics table for the BZX79C11 variant and distinguishes it from lower-voltage BZX79C devices (e.g., BZX79C6V2 at +0.4 mV/°C). Designers use this known TC for thermal drift compensation in the BZX79C11-T50A's reference applications.
What is the dynamic impedance of the BZX79C11-T50A at 5 mA?
The dynamic impedance (ZZ) of the BZX79C11-T50A is 8 Ω maximum at IZ = 5 mA and TA = 25°C. This parameter reflects the diode's ability to maintain stable voltage under small-signal current variations and is critical for low-noise reference performance. The BZX79C11-T50A's ZZ is measured under standardized thermal equilibrium conditions per Note 1 in the ON Semiconductor datasheet.
BZX79C11-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):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 8 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
BZX79C11-T50A FAQ
1.How can I place an order for BZX79C11-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C11-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 BZX79C11-T50A reliable?
The price and inventory of BZX79C11-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C11-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C11-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C11-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C11-T50A?
BZX79C11-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C11-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 BZX79C11-T50A?
For technical support, including BZX79C11-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C11-T50A requirements.
6.How does Aetrix verify that BZX79C11-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C11-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 BZX79C11-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C11-T50A?
All BZX79C11-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C11-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 BZX79C11-T50A part is unused and in its original packaging.
Return procedure for BZX79C11-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX79C11-T50A Tags
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MMBZ5240B-7-F
Diodes Incorporated
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