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onsemi 1N4744A-T50R
- Part No.:
- 1N4744A-T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744A-T50R.pdf
- Description:
- DIODE ZENER 15V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:2,981
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Product details
Overview
1N4744A-T50R from onsemi is a 15 V, 1 W axial-leaded Zener diode in DO-41 glass package, with ±5% tolerance, 17 Ω dynamic impedance at 15 mA test current, and 0.25 µA leakage at 12.2 V reverse voltage. It regulates voltage in low-power linear power supplies and reference circuits.
For engineers reviewing the 1N4744A-T50R datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal derating (6.67 mW/°C above 50°C), junction temperature range (–65°C to +200°C), and DO-41 mechanical compatibility.
Technical Context
This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 15 V nominal zener voltage is specified at 15 mA test current (IZ), with typical dynamic impedance of 17 Ω measured at that bias point.
The diode supports stable regulation under DC and low-frequency conditions, with non-repetitive peak reverse surge current rated at 304 mA (8.3 ms square wave). It requires no external biasing or control circuitry and functions solely via reverse-biased junction conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V nominal, min 14.25 V / max 15.75 V at IZ = 15 mA - defines regulated output voltage under standard test conditions |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C, lead length = 3/8″ - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZ) | 17 Ω @ IZ = 15 mA - indicates voltage regulation stiffness; lower value means tighter regulation under load variation |
| Leakage Current (IR) | 0.25 µA @ VR = 12.2 V - specifies reverse current below breakdown, critical for low-power standby circuits |
| Operating Temperature | –65°C to +200°C - enables use in automotive engine compartments and industrial environments without derating |
| Thermal Derating | 6.67 mW/°C above 50°C - determines usable power at elevated ambient temperatures with standard lead mounting |
Pinout & Package
DO-41 glass axial package with cathode band marking; two-terminal device requiring no orientation-specific PCB footprint beyond standard diode placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in reverse-bias operation | Connected to circuit ground or lower potential node when used as shunt regulator |
| Cathode | Zener breakdown terminal / high-voltage side in reverse-bias operation | Connected to unregulated input; develops regulated voltage at cathode-to-anode drop |
Key Features
| Feature | Design Value |
|---|---|
| ±5% voltage tolerance | Ensures predictable regulation across production lots without post-assembly trimming |
| DO-41 glass package | Provides hermetic sealing and thermal stability for long-term reliability in humid or high-temp environments |
| 1.0 W power rating | Supports direct regulation of small-signal analog rails (e.g., op-amp references) without heatsinking |
| Low leakage (0.25 µA) | Minimizes quiescent current draw in battery-powered or energy-harvesting systems |
Applications
| Low-Voltage Reference Supply | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Providing stable 15 V reference for ADC voltage references or comparator thresholds in industrial sensor interfaces. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise DC bias point independent of supply ripple. Use Value: Maintains 15 V ±0.75 V over temperature and line variations, enabling <1 LSB error in 12-bit ADC systems. | Use Scenario: Clamping transient surges on 12 V automotive CAN bus lines during load dump events. IC Role / Device Role / Timing Role: Passive overvoltage clamp limiting rail voltage to safe levels during ESD or inductive kickback. Use Value: Absorbs 304 mA non-repetitive surge (8.3 ms) without failure, protecting downstream transceivers. |
| Linear Regulator Feedback | Power Supply Startup Sequencing |
Use Scenario: Setting output voltage in discrete adjustable linear regulators using LM317 or similar ICs. IC Role / Device Role / Timing Role: Precision voltage divider element defining feedback node voltage in series-pass regulator topology. Use Value: Enables accurate 15 V output with <±1% total error including resistor tolerance and tempco effects. | Use Scenario: Delaying activation of secondary power domains by holding reset lines until main rail reaches 15 V. IC Role / Device Role / Timing Role: Threshold detector triggering POR (power-on reset) logic when input exceeds zener knee voltage. Use Value: Provides deterministic 15 V turn-on threshold with <10 µs response time to rising input edges. |
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) | Same 15 V VZ, ±5%, DO-41, but 1.3 W PD rating and 20 Ω ZZ at 15 mA | Slightly higher power margin; suitable where transient overload is frequent | Select when higher surge robustness is required without changing layout |
| BZX55-C15 (Vishay) | 15 V VZ, ±5%, DO-35 package, 500 mW PD, 25 Ω ZZ at 5 mA | Smaller footprint and lower power; intended for signal-level rather than power-level regulation | Choose for space-constrained PCBs where 1 W dissipation is unnecessary |
Compared with 1N4744A-T50R, the 1N4744A-TP offers higher surge capability in identical DO-41 form factor, while BZX55-C15 trades power and thermal performance for miniaturization - making the former ideal for ruggedized designs and the latter for compact consumer electronics.
Availability
1N4744A-T50R is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and legacy linear power supplies requiring stable component supply and long-lifecycle support.
Supply support for 1N4744A-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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.
The 1N47xxA series is part of onsemi's legacy Zener diode portfolio designed specifically for general-purpose voltage regulation and clamping in cost-sensitive, high-reliability applications.
FAQ
What is the exact zener voltage tolerance for 1N4744A-T50R?
The 1N4744A-T50R has a guaranteed zener voltage range of 14.25 V to 15.75 V at 15 mA test current, corresponding to ±5% tolerance per the onsemi 1N4728A–1N4758A datasheet Rev. 8. This tolerance applies across the full operating temperature range and is verified during production testing.
Can 1N4744A-T50R be used in surface-mount designs?
No - the 1N4744A-T50R is packaged in DO-41 axial glass, which is through-hole only. It lacks SMD-compatible terminations or tape-and-reel packaging. For surface-mount equivalents, consider SMAJ15A or BZX384-B15, but note these differ in power rating, impedance, and thermal behavior versus the 1N4744A-T50R.
What is the maximum allowable junction temperature for 1N4744A-T50R?
The 1N4744A-T50R has a maximum junction temperature (TJ) of +200°C and minimum of –65°C, as specified in the Absolute Maximum Ratings table. This allows operation in under-hood automotive or high-ambient industrial settings, provided power dissipation remains within derated limits above 50°C ambient.
How does thermal derating affect 1N4744A-T50R's power handling?
1N4744A-T50R must be derated at 6.67 mW/°C above 50°C lead temperature. At 100°C ambient with standard 3/8″ leads, its usable power drops to 0.67 W. This derating ensures junction temperature stays within –65°C to +200°C limits and prevents parametric shift or premature failure.
Is 1N4744A-T50R RoHS compliant and halogen-free?
Yes - the 1N4744A-T50R meets RoHS Directive 2011/65/EU and is halogen-free per onsemi's material declarations. The DO-41 glass package contains no lead in solderable terminations, and all internal materials comply with JEDEC J-STD-704 standards for green packaging.
1N4744A-T50R 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-T50R FAQ
1.How can I place an order for 1N4744A-T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744A-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 1N4744A-T50R reliable?
The price and inventory of 1N4744A-T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744A-T50R is usually 5 days.
3.What payment methods are accepted for 1N4744A-T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744A-T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744A-T50R?
1N4744A-T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744A-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 1N4744A-T50R?
For technical support, including 1N4744A-T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744A-T50R requirements.
6.How does Aetrix verify that 1N4744A-T50R is sourced from the original manufacturer or authorized distributors?
All 1N4744A-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 1N4744A-T50R meets industry standards.
7.What is the process for return or replacement of 1N4744A-T50R?
All 1N4744A-T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744A-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 1N4744A-T50R part is unused and in its original packaging.
Return procedure for 1N4744A-T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744A-T50R Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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