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onsemi 1N4744A_T26R
- Part No.:
- 1N4744A_T26R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744A_T26R.pdf
- Description:
- DIODE ZENER 15V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:9,466
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Product details
Overview
1N4744A_T26R 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 17 Ω maximum Zener impedance at 14 mA test current and 0.25 μA leakage current at 12.2 V reverse voltage. It provides stable voltage regulation in low-power reference and protection circuits.
For engineers reviewing the 1N4744A_T26R datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal derating behavior (6.67 mW/°C above 50°C), junction temperature range (–65°C to +200°C), and DO-41 mechanical compatibility in legacy through-hole designs.
Technical Context
The 1N4744A_T26R operates as a silicon planar Zener diode optimized for precision voltage regulation in DC bias networks and overvoltage clamping. Its 15 V nominal breakdown voltage is specified at 14 mA test current, with tight 5% tolerance and low dynamic impedance (17 Ω max) ensuring minimal output variation under load changes.
It exhibits low leakage (≤0.25 μA at VR = 12.2 V) and high surge capability (IZSM = 304 mA non-repetitive peak reverse current), making it suitable for transient suppression in power supply feedback paths and analog reference stabilization where thermal stability and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.0 V nominal, min 14.25 V / max 15.75 V at 14 mA - defines regulated output voltage window under standard test conditions |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZ) | 17 Ω max @ IZ = 14 mA - determines AC regulation sensitivity and ripple rejection in reference circuits |
| Leakage Current (IR) | 0.25 μA max @ VR = 12.2 V - ensures minimal error current in high-impedance bias networks |
| Operating Temperature | –65°C to +200°C - supports deployment in automotive under-hood, industrial control, and aerospace environments |
| Package | DO-41 glass case with cathode band - industry-standard axial leaded package compatible with manual and wave soldering |
Pinout & Package
DO-41 glass package: axial leads, cathode identified by single black band; no active pins - two-terminal device with anode and cathode terminals only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-biased Zener operation; carries full load current during regulation |
| Cathode | Zener breakdown terminal | Marked with black band; connected to higher potential side; establishes regulated voltage drop across device |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables predictable regulation without post-manufacture trimming in cost-sensitive consumer and industrial supplies |
| 1.0 W power rating with linear derating | Supports robust operation up to 50°C ambient without heatsinking; derates 6.67 mW/°C beyond that point |
| Low 17 Ω dynamic impedance | Minimizes output voltage shift under varying load currents, improving stability in feedback loops |
| 0.25 μA max leakage at 12.2 V | Reduces error in high-resistance voltage divider networks used in precision analog references |
Applications
| Switch-Mode Power Supply Feedback | Microcontroller Voltage Reference |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element setting error amplifier threshold; replaces precision shunt regulator in low-cost designs. Use Value: Provides 15 V reference with ±5% accuracy and low dynamic impedance, enabling stable regulation without external trimming components. | Use Scenario: Supplies stable bias voltage to ADC reference input or internal LDO enable circuitry in embedded microcontrollers. IC Role / Device Role / Timing Role: Passive voltage clamp and reference source; stabilizes analog subsystems against supply ripple. Use Value: Delivers low-leakage (≤0.25 μA), thermally stable reference within –65°C to +200°C operating range for extended environmental reliability. |
| Overvoltage Protection Clamp | Linear Regulator Pre-regulation |
Use Scenario: Placed across sensitive IC inputs to limit transient spikes from ESD or inductive switching events. IC Role / Device Role / Timing Role: Fast-acting voltage clamp absorbing energy during short-duration surges (IZSM = 304 mA, 8.3 ms). Use Value: Limits voltage to ≤15.75 V with fast response and no recovery delay, protecting downstream logic and analog inputs. | Use Scenario: Reduces input-to-output differential in series pass regulator stages to minimize power dissipation in the pass transistor. IC Role / Device Role / Timing Role: Pre-regulator element lowering unregulated rail before final LDO stage. Use Value: Enables efficient thermal management in dual-stage regulators by fixing intermediate rail at 15 V with 1.0 W continuous handling capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A-TP (Micro Commercial Co.) | Same 15 V nominal Zener voltage, ±5% tolerance, DO-41 package, but rated for 1.0 W at 75°C lead temperature (vs. 50°C for 1N4744A_T26R) | Higher thermal rating allows marginally better power handling in compact layouts with elevated ambient temperatures | Select when board-level thermal management exceeds 50°C at lead termination point |
| BZX55-C15 (Vishay) | 15 V Zener, ±5%, DO-35 package (smaller than DO-41), 500 mW power rating, higher ZZ (30 Ω max) | Limited to lower-power applications due to reduced dissipation and higher impedance; not mechanically interchangeable | Choose only for space-constrained PCBs where 500 mW rating suffices and DO-35 footprint is acceptable |
Compared with 1N4744A_T26R, the 1N4744A-TP offers identical electrical specs with relaxed thermal limits, while BZX55-C15 trades size and power for reduced regulation precision-making 1N4744A_T26R optimal for legacy DO-41 designs requiring full 1.0 W capability and low-impedance stability.
Availability
1N4744A_T26R is available at Aetrix Electronics and suitable for switch-mode power supply feedback, microcontroller voltage reference, and overvoltage protection applications requiring stable component supply across industrial, automotive, and consumer electronics programs.
Supply support for 1N4744A_T26R 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, sensors, and discrete devices, with a focus on energy-efficient and reliable electronic systems.
The 1N47xxA series was designed for general-purpose voltage regulation and clamping in cost-sensitive, high-volume applications-emphasizing manufacturability, thermal robustness, and broad environmental operating range.
FAQ
What is the Zener voltage tolerance of the 1N4744A_T26R?
The 1N4744A_T26R has a Zener voltage tolerance of ±5%, meaning its breakdown voltage falls between 14.25 V and 15.75 V when measured at 14 mA test current and 25°C ambient. This tolerance is guaranteed per ON Semiconductor's 1N4728A–1N4758A datasheet Rev. 8, and applies directly to the 1N4744A_T26R as a member of that family. The 1N4744A_T26R maintains this specification across its full operating temperature range.
Can the 1N4744A_T26R be used in surface-mount designs?
No, the 1N4744A_T26R is packaged in the DO-41 axial leaded glass case and is intended for through-hole mounting only. It is not compatible with SMT reflow or pick-and-place processes. For surface-mount equivalents, consider SOD-123 or SOD-323 packaged Zeners such as MMBZ5245B (15 V), but note these differ in power rating, impedance, and thermal behavior from the 1N4744A_T26R.
What is the maximum non-repetitive peak reverse current for the 1N4744A_T26R?
The 1N4744A_T26R has a maximum non-repetitive peak reverse current (IZSM) of 304 mA, specified for an 8.3 ms square-wave surge per ON Semiconductor's datasheet. This value reflects the device's ability to absorb transient energy without failure and is directly applicable to the 1N4744A_T26R under standardized test conditions defined in the 1N4728A–1N4758A family documentation.
How does thermal derating work for the 1N4744A_T26R?
The 1N4744A_T26R is rated for 1.0 W power dissipation only when lead temperature (TL) is ≤50°C; above that, it derates linearly at 6.67 mW/°C. This means at TL = 75°C, its usable power drops to 833 mW. Derating is based on actual lead temperature-not ambient-and must be calculated using thermal resistance models tied to PCB layout and airflow. The 1N4744A_T26R's DO-41 package requires proper lead length (3/8″) for compliance with this rating.
Is the 1N4744A_T26R RoHS compliant and halogen-free?
Yes, the 1N4744A_T26R meets RoHS Directive 2011/65/EU requirements and is halogen-free per ON Semiconductor's product change notices and material declarations. Compliance is verified for the DO-41 package variant shipped under the T26R suffix, and applies to all units manufactured after Q3 2012. Full substance data and declaration reports for the 1N4744A_T26R are available via ON Semiconductor's Quality Portal.
1N4744A_T26R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- 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_T26R FAQ
1.How can I place an order for 1N4744A_T26R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744A_T26R 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_T26R reliable?
The price and inventory of 1N4744A_T26R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744A_T26R is usually 5 days.
3.What payment methods are accepted for 1N4744A_T26R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744A_T26R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744A_T26R?
1N4744A_T26R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744A_T26R 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_T26R?
For technical support, including 1N4744A_T26R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744A_T26R requirements.
6.How does Aetrix verify that 1N4744A_T26R is sourced from the original manufacturer or authorized distributors?
All 1N4744A_T26R 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_T26R meets industry standards.
7.What is the process for return or replacement of 1N4744A_T26R?
All 1N4744A_T26R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744A_T26R, 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_T26R part is unused and in its original packaging.
Return procedure for 1N4744A_T26R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744A_T26R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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