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onsemi 1N4744A_NT50A
- Part No.:
- 1N4744A_NT50A
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744A_NT50A.pdf
- Description:
- DIODE ZENER 15V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,651
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Product details
Overview
1N4744A_NT50A from ON Semiconductor is a 15 V, ±5% tolerance Zener diode in DO-41 glass package, rated for 1.0 W power dissipation at TL ≤ 50°C with 6.67 mW/°C derating, designed for precision voltage regulation and reference applications in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N4744A_NT50A datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (15 V), test current (14 mA), maximum Zener impedance (17 Ω at IZ), leakage current (5 µA at VR = 12.2 V), and thermal operating range (–65°C to +200°C).
Technical Context
This device operates as a two-terminal voltage reference diode, maintaining stable reverse breakdown voltage across its cathode-anode terminals under controlled DC bias. Its Zener voltage is specified at 14 mA test current with typical impedance of 15.5 Ω and maximum of 17 Ω, ensuring predictable regulation in low-noise analog and feedback control paths.
The 1N4744A_NT50A exhibits 5% tolerance on VZ (14.25 V min / 15.75 V max), 0.25 mA knee current (IZK), and 5 µA leakage at 12.2 V reverse bias - parameters critical for setting accurate reference thresholds in linear regulators and clamping circuits without excessive quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V nominal, 14.25–15.75 V range at 14 mA - defines precise regulation point for feedback networks. |
| Power Dissipation (PD) | 1.0 W at TL ≤ 50°C - sets maximum continuous power handling before thermal derating applies. |
| Zener Impedance (ZZ) | 17 Ω max at IZ = 14 mA - determines output voltage stability under load variation. |
| Knee Current (IZK) | 0.25 mA - minimum current needed to initiate stable Zener conduction near regulation threshold. |
| Leakage Current (IR) | 5 µA max at VR = 12.2 V - ensures minimal error current in high-impedance reference nodes. |
| Operating Temperature | –65°C to +200°C - supports operation in automotive under-hood and industrial environments. |
Pinout & Package
DO-41 glass axial package with cathode indicated by color band; two-terminal device requiring no external biasing circuitry beyond series current-limiting resistor.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to system ground or low-side reference point in shunt regulator topology. |
| Cathode | Zener breakdown terminal / Regulated output node | Provides stable 15 V reference when biased above VZ through series resistor; marked with band. |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables tight voltage reference accuracy without post-calibration in cost-sensitive designs. |
| 1.0 W power rating | Supports higher-current shunt regulation than lower-power Zeners (e.g., ½ W types) without heatsinking. |
| Low 17 Ω dynamic impedance | Minimizes output voltage shift under varying load currents in feedback divider networks. |
| –65°C to +200°C operating range | Validates use in extended-temperature industrial and automotive power modules. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 15 V threshold for TL431 or similar error amplifier input. Use Value: Maintains ±1% output regulation across line/load variations due to stable VZ and low ZZ. |
Use Scenario: Placed across sensitive IC supply rail to clamp transient overvoltage events. IC Role / Device Role / Timing Role: Fast-acting crowbar element limiting rail voltage to 15.75 V maximum during ESD or surge. Use Value: Prevents latch-up or damage in microcontrollers and analog front-ends with 5 µA leakage at 12.2 V. |
| Linear Regulator Reference | ADC Reference Buffer |
Use Scenario: Provides stable reference for adjustable LDOs like LM317 configured for fixed 15 V output. IC Role / Device Role / Timing Role: Precision voltage source setting output via resistive divider ratio. Use Value: Delivers <10 mV drift over –40°C to +85°C, enabling stable output without trimming. |
Use Scenario: Supplies clean reference to 12-bit SAR ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Low-noise, low-drift analog reference node decoupled from noisy digital supplies. Use Value: 17 Ω impedance and 5% tolerance ensure <0.5 LSB reference error at 15 V full-scale. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX85C15 | Same 15 V nominal VZ, but 1.3 W power rating and 10% tolerance; TO-204AA (DO-41 equivalent) package. | Higher power margin suits higher-current clamping; wider tolerance reduces precision in feedback loops. | Select BZX85C15 only if >1 W dissipation or relaxed accuracy is acceptable. |
| 1N5245B | 15 V nominal VZ, 0.5 W rating, 5% tolerance, DO-35 package - smaller footprint, lower thermal mass. | Lower power handling limits use to low-current references; DO-35 requires different PCB layout. | Choose 1N5245B for space-constrained boards where 500 mW suffices and thermal design permits. |
Compared with BZX85C15 and 1N5245B, the 1N4744A_NT50A offers optimal balance of 1.0 W power, 5% tolerance, and DO-41 mechanical robustness for general-purpose voltage reference use - neither over-specified nor under-rated for mainstream industrial power designs.
Availability
1N4744A_NT50A is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and linear regulator reference designs requiring stable component supply with consistent parametric performance and long-term availability.
Supply support for 1N4744A_NT50A 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, sensor, and logic solutions for automotive, industrial, and consumer markets.
The 1N47xxA series delivers standardized, high-reliability Zener diodes optimized for voltage regulation, reference, and clamping in cost-sensitive, high-volume power electronics applications.
FAQ
What is the nominal Zener voltage and tolerance of the 1N4744A_NT50A?
The 1N4744A_NT50A has a nominal Zener voltage of 15 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 14.25 V and 15.75 V when tested at 14 mA. This specification is verified per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8, and applies directly to the 1N4744A_NT50A as part of that family.
What is the maximum power dissipation rating for the 1N4744A_NT50A?
The 1N4744A_NT50A is rated for 1.0 W power dissipation at lead temperature (TL) ≤ 50°C with 3/8″ lead length. Above 50°C, it derates linearly at 6.67 mW/°C. This rating is defined in the Absolute Maximum Ratings table of the official ON Semiconductor datasheet for the 1N4728A–1N4758A series.
What package type does the 1N4744A_NT50A use, and how is polarity marked?
The 1N4744A_NT50A uses a DO-41 glass axial package with cathode identified by a single color band on the body. The anode is the unmarked end. This packaging is standard across the 1N47xxA family and confirmed in the "Top Mark Information" section of the ON Semiconductor datasheet.
What is the Zener impedance of the 1N4744A_NT50A, and why does it matter?
The 1N4744A_NT50A has a maximum Zener impedance (ZZ) of 17 Ω at 14 mA test current. This value reflects dynamic resistance in breakdown mode and directly impacts voltage regulation stability - lower ZZ means less output variation under changing load conditions, critical for precision feedback applications.
Can the 1N4744A_NT50A be used in automotive under-hood applications?
Yes, the 1N4744A_NT50A supports operating temperatures from –65°C to +200°C, making it suitable for under-hood automotive environments where ambient temperatures exceed 125°C. Its glass DO-41 construction and wide thermal range are explicitly validated in the ON Semiconductor 1N4728A–1N4758A datasheet.
1N4744A_NT50A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 11.4 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4744A_NT50A FAQ
1.How can I place an order for 1N4744A_NT50A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744A_NT50A 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 1N4744A_NT50A reliable?
The price and inventory of 1N4744A_NT50A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744A_NT50A is usually 5 days.
3.What payment methods are accepted for 1N4744A_NT50A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744A_NT50A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744A_NT50A?
1N4744A_NT50A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744A_NT50A 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 1N4744A_NT50A?
For technical support, including 1N4744A_NT50A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744A_NT50A requirements.
6.How does Aetrix verify that 1N4744A_NT50A is sourced from the original manufacturer or authorized distributors?
All 1N4744A_NT50A 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 1N4744A_NT50A meets industry standards.
7.What is the process for return or replacement of 1N4744A_NT50A?
All 1N4744A_NT50A units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744A_NT50A, 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 1N4744A_NT50A part is unused and in its original packaging.
Return procedure for 1N4744A_NT50A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744A_NT50A Tags
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