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onsemi BZX79C15-T50A
- Part No.:
- BZX79C15-T50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BZX79C15-T50A.pdf
- Description:
- DIODE ZENER 15V 500MW DO35
- Quantity:
- Payment:
- Shipping:
Inventory:18,802
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Product details
Overview
BZX79C15-T50A from ON Semiconductor is a 15 V, 5% tolerance, 500 mW DO-35 glass-case Zener diode optimized for voltage regulation and reference applications in power supply feedback loops, overvoltage protection circuits, and precision biasing networks. It delivers stable Zener voltage at 5 mA test current with 30 Ω dynamic impedance and operates across –65°C to +200°C.
For engineers reviewing the BZX79C15-T50A datasheet, pinout, applications, or equivalent options, key selection criteria include its 15.0 V nominal Zener voltage, ±5% tolerance, 30 Ω Zener impedance at 5 mA, 0.05 μA maximum leakage at 12 V, and DO-35 axial package compatibility with legacy through-hole designs.
Technical Context
This discrete Zener diode operates in reverse breakdown mode to maintain a stable reference voltage under varying load and temperature conditions. Its 30 Ω dynamic impedance ensures low output variation with current changes, while the –65°C to +200°C operating range supports industrial and automotive under-hood environments.
The device features a 500 mW power rating at TL ≤ 75°C with 4.0 mW/°C derating above that temperature, and exhibits a positive temperature coefficient of +9.2 mV/°C - enabling predictable voltage drift compensation in multi-diode reference strings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13.8 V min / 15.6 V max at IZ = 5 mA - defines usable regulation window for 15 V nominal reference |
| Tolerance | ±5% - enables direct substitution in legacy 15 V Zener designs without recalibration |
| Zener Impedance (ZZ) | 30 Ω max at IZ = 5 mA - limits output voltage shift to ≤150 mV per 5 mA load change |
| Leakage Current (IR) | 0.05 μA max at VR = 12 V - ensures minimal error current in high-impedance reference nodes |
| Power Dissipation (PD) | 500 mW @ TL ≤ 75°C - supports continuous operation in compact PCB layouts with 3/8″ lead length |
| Temp. Coefficient (TC) | +9.2 mV/°C - allows predictable thermal drift modeling in temperature-critical references |
| Junction Temp. Range | –65°C to +200°C - qualified for extended-range industrial and under-hood automotive use |
Pinout & Package
DO-35 glass axial package with cathode indicated by color band; two-terminal device with no internal connections beyond anode and cathode leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference ground node | Connected to circuit ground or lower-potential rail when used in shunt regulation |
| Cathode | Zener voltage reference terminal / Reverse breakdown input | Connected to regulated voltage node; color band identifies this terminal physically |
Key Features
| Feature | Design Value |
|---|---|
| Stable 15 V reference | 13.8–15.6 V range at 5 mA ensures tight regulation in feedback paths without trimming |
| Low dynamic impedance | 30 Ω max maintains <±150 mV output shift across 5 mA load steps |
| High-temperature operation | Rated to +200°C junction temperature supports engine control and industrial motor drive applications |
| Low leakage current | 0.05 μA max at 12 V prevents loading errors in high-Z voltage dividers and sensor bias networks |
| Standard DO-35 footprint | Enables drop-in replacement in existing through-hole PCBs designed for legacy Zener families |
Applications
| Power Supply Voltage Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in the feedback network of isolated DC-DC converters to regulate output voltage accuracy. IC Role / Device Role / Timing Role: Shunt reference diode providing precise 15 V threshold for optocoupler-based feedback loop. Use Value: ±5% tolerance and 30 Ω ZZ ensure output regulation within ±1.5% over line/load/temperature. | Use Scenario: Placed across sensitive IC inputs to clamp transient overvoltages exceeding 15 V. IC Role / Device Role / Timing Role: Passive clamping element diverting surge current to ground before damage occurs. Use Value: 500 mW rating sustains short-duration transients; 0.05 μA leakage avoids signal distortion during normal operation. |
| Temperature-Stable Bias Network | Legacy Industrial Control Interface |
Use Scenario: Paired with complementary diodes in a temperature-compensated reference string for analog front-ends. IC Role / Device Role / Timing Role: Positive TC (+9.2 mV/°C) component balancing negative TC elements in multi-diode references. Use Value: Enables <±50 ppm/°C reference stability without active compensation circuitry. | Use Scenario: Embedded in PLC I/O modules to stabilize 15 V logic supply rails against ripple and brownout. IC Role / Device Role / Timing Role: Local shunt regulator maintaining clean 15 V for microcontroller peripherals and ADC references. Use Value: DO-35 package fits legacy through-hole footprints; –65°C to +200°C rating matches industrial ambient requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | Same 15 V nominal, ±5% tolerance, but 1.0 Ω higher ZZ (31 Ω max), 1.0 μA higher leakage at 12 V | Identical DO-41 package; slightly larger thermal resistance due to plastic case vs. DO-35 glass | Acceptable where 15 V reference stability and leakage are less critical; verify thermal margin in high-density layouts |
| BZX55C15 | Same 15 V, ±5%, but 50 Ω ZZ max and 0.1 μA leakage at 12 V; rated for 500 mW at 50°C ambient | DO-35 package identical; lower thermal performance limits sustained power in enclosed enclosures | Valid alternative if board-level airflow is constrained and full 500 mW is not required continuously |
Compared with BZX79C15-T50A, the 1N4744A offers near-equivalent electrical specs but reduced thermal robustness in glass-package-sensitive environments, while the BZX55C15 trades off Zener impedance and leakage for lower cost - making it suitable only where tighter regulation is not required.
Availability
BZX79C15-T50A is available at Aetrix Electronics and suitable for power supply voltage reference, overvoltage clamp protection, and temperature-stable bias network applications requiring stable component supply and long-term obsolescence mitigation.
Supply support for BZX79C15-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 is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BZX79C series belongs to ON Semiconductor's general-purpose Zener diode product line, engineered for reliable voltage regulation and reference functions in cost-sensitive, high-volume industrial and power management applications.
FAQ
What is the Zener voltage tolerance for BZX79C15-T50A?
The BZX79C15-T50A has a ±5% Zener voltage tolerance, resulting in a guaranteed range of 13.8 V to 15.6 V at 5 mA test current. This tolerance is specified per the ON Semiconductor datasheet Rev. 3 (November 2017) and applies under standard thermal equilibrium conditions at lead temperature of 30°C ± 1°C. The BZX79C15-T50A maintains this tolerance across its full operating temperature range.
What is the maximum power dissipation of BZX79C15-T50A and how does it derate with temperature?
The BZX79C15-T50A has a maximum power dissipation of 500 mW at lead temperature (TL) ≤ 75°C with 3/8″ lead length. Above 75°C, it derates linearly at 4.0 mW/°C. This means at 100°C lead temperature, its usable power drops to 400 mW. The BZX79C15-T50A must be mounted with appropriate lead length and PCB copper area to maintain safe junction temperatures up to +200°C.
What is the Zener impedance (ZZ) specification for BZX79C15-T50A?
The BZX79C15-T50A has a maximum Zener impedance (ZZ) of 30 Ω measured at IZ = 5 mA and TA = 25°C. This value reflects the dynamic resistance in the breakdown region and directly impacts regulation accuracy under varying load currents. The BZX79C15-T50A uses this low ZZ to minimize output voltage deviation in shunt regulator configurations.
Does BZX79C15-T50A have a specified leakage current, and at what reverse voltage is it measured?
Yes, the BZX79C15-T50A specifies a maximum leakage current (IR) of 0.05 μA at VR = 12 V and TA = 25°C. This ultra-low leakage ensures minimal error current in high-impedance reference circuits and makes the BZX79C15-T50A suitable for precision biasing applications where loading effects must be avoided.
What package type is used for BZX79C15-T50A, and how is polarity marked?
The BZX79C15-T50A uses a DO-35 glass axial package with cathode identified by a color band on the body. The anode and cathode leads extend axially from opposite ends of the cylindrical glass envelope. This package is standardized across the BZX79C family and ensures mechanical and thermal compatibility with legacy through-hole assembly processes. The BZX79C15-T50A follows the same marking convention as other devices in the series.
BZX79C15-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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 10.5 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
BZX79C15-T50A FAQ
1.How can I place an order for BZX79C15-T50A through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX79C15-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 BZX79C15-T50A reliable?
The price and inventory of BZX79C15-T50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX79C15-T50A is usually 5 days.
3.What payment methods are accepted for BZX79C15-T50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX79C15-T50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX79C15-T50A?
BZX79C15-T50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX79C15-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 BZX79C15-T50A?
For technical support, including BZX79C15-T50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX79C15-T50A requirements.
6.How does Aetrix verify that BZX79C15-T50A is sourced from the original manufacturer or authorized distributors?
All BZX79C15-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 BZX79C15-T50A meets industry standards.
7.What is the process for return or replacement of BZX79C15-T50A?
All BZX79C15-T50A units undergo pre-shipment inspection (PSI). If there is an issue with BZX79C15-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 BZX79C15-T50A part is unused and in its original packaging.
Return procedure for BZX79C15-T50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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