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Microchip Technology 1N4744P/TR12
- Part No.:
- 1N4744P/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744P/TR12.pdf
- Description:
- DIODE ZENER 15V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,869
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Product details
Overview
1N4744P/TR12 from Microsemi is a 15 V, 1 W axial-lead Zener diode in DO-41 plastic package with ±5% voltage tolerance, 14 Ω dynamic impedance at 17 mA test current, and 0.25 A maximum regulator current at 50°C. It provides stable voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4744P/TR12 datasheet, 1N4744P/TR12 pinout, 1N4744P/TR12 application, or 1N4744P/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45°C/W junction-to-lead), surge current rating (304 mA), reverse leakage (<5 µA at 11.4 V), and RoHS-compliant tape-and-reel packaging (TR12).
Technical Context
The 1N4744P/TR12 operates as a silicon planar Zener diode optimized for stable DC voltage regulation across wide temperature (-65°C to +150°C) and current ranges. Its 15 V nominal breakdown voltage is specified at 17 mA test current with sharp knee characteristics confirmed by dual-point Zener impedance measurement per MicroNote 202.
Thermal performance is defined for two mounting conditions: 45°C/W junction-to-lead at 10 mm lead length, and 105°C/W junction-to-ambient on FR4 with 4 mm² copper pads. Forward voltage remains ≤1.2 V at 200 mA, supporting bidirectional use in clamp and protection roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V ±5% at 17 mA - defines precise regulation point for feedback references |
| Power Dissipation | 1.0 W at TL < 105°C - sets maximum continuous power handling on leaded PCB mount |
| Dynamic Impedance (ZZT) | 14 Ω at IZT = 17 mA - ensures low output impedance for stable regulation under load variation |
| Max Regulator Current (IZM) | 304 mA at TA = 50°C - determines peak current capability before thermal derating |
| Reverse Leakage (IR) | <5 µA at VR = 11.4 V - guarantees minimal quiescent current in standby mode |
| Surge Current (ISM) | 304 mA (½-sine, 1/120 s) - supports transient overvoltage clamping without failure |
| Thermal Resistance | 45°C/W junction-to-lead - enables thermal design with standard lead length (10 mm) |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode band marking; terminals are unidirectional anode/cathode leads for through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential node; used for clamping or ESD protection paths |
| Cathode | Current exit terminal in forward bias; Zener regulation terminal in reverse bias | Banded end; connected to regulated voltage rail; must be held positive relative to anode for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior enabling direct replacement in legacy designs |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body (G-suffix) variants - improves power handling reliability |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT assembly logistics |
| RoHS-compliant "e3" option | Matte-tin plating per MIL-STD-750 Method 2026 - ensures solderability and environmental compliance |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in production |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulators or switching converter error amplifiers. IC Role / Device Role / Timing Role: Precision shunt voltage reference providing 15 V setpoint with ±5% tolerance. Use Value: Maintains output regulation within ±1% over line/load variations due to low 14 Ω dynamic impedance. | Use Scenario: Clamping transient spikes on 12 V automotive or industrial control bus lines. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as crowbar element during overvoltage events. Use Value: Absorbs 304 mA surge current without degradation, protecting downstream logic from >15 V excursions. |
| Signal Level Shifting | ESD Transient Suppression |
Use Scenario: Biasing op-amp input stages or setting threshold voltages in comparator circuits. IC Role / Device Role / Timing Role: Fixed-voltage clamp defining upper signal swing limit in analog front-ends. Use Value: Delivers repeatable 15 V reference with <5 µA leakage at 11.4 V, minimizing offset errors. | Use Scenario: Protecting I/O pins of microcontrollers or sensors against electrostatic discharge. IC Role / Device Role / Timing Role: Low-capacitance shunt device diverting ESD energy to ground. Use Value: Withstands 260°C soldering for 10 s and passes MIL-STD-750 Method 1020 ESD testing without parameter shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | No TR suffix - bulk packaging only; identical electrical specs and DO-41 package | Not suitable for automated pick-and-place; requires manual loading or tube-to-tape conversion | Select 1N4744P/TR12 when tape-and-reel feed is required for SMT line integration |
| BZX55C15 | 5% tolerance, 15 V, 500 mW - lower power rating and higher ZZT (20 Ω) | Limited to low-current references; cannot sustain 304 mA surge or 1 W continuous dissipation | Choose BZX55C15 only for space-constrained low-power designs where 1 W rating is unnecessary |
Compared with 1N4744A and BZX55C15, the 1N4744P/TR12 uniquely combines full 1 W power capability, industry-standard DO-41 mechanical compatibility, and TR12 tape-and-reel packaging - making it optimal for high-reliability power regulation in automated manufacturing environments.
Availability
1N4744P/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and signal level shifting applications requiring stable component supply, consistent Zener voltage tolerance, and RoHS-compliant packaging.
Supply support for 1N4744P/TR12 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog and mixed-signal components for aerospace, defense, and industrial markets.
The 1N4744P/TR12 belongs to Microsemi's legacy 1N47xxAP Zener diode family, engineered for robust voltage regulation in harsh-environment power systems where long-term stability and thermal resilience are critical.
FAQ
What is the Zener voltage tolerance for 1N4744P/TR12?
The 1N4744P/TR12 has a nominal Zener voltage of 15 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 17 mA test current and 25°C lead temperature, ensuring predictable regulation across production lots and operating conditions.
Does 1N4744P/TR12 support automated assembly?
Yes, the "TR12" suffix confirms that the 1N4744P/TR12 is supplied in EIA-296 standard tape-and-reel format compatible with high-speed pick-and-place equipment. The DO-41 package geometry and lead pitch meet industry requirements for reliable feeding and placement.
What is the maximum continuous power dissipation for 1N4744P/TR12?
The 1N4744P/TR12 is rated for 1.0 W continuous power dissipation at lead temperature (TL) below 105°C with 10 mm lead length from body. Derating is required above this temperature per the published power derating curve in the Microsemi datasheet.
How does the plastic "P" suffix affect thermal performance of 1N4744P/TR12?
The "P" suffix denotes plastic encapsulation, which provides lower thermal resistance (45°C/W junction-to-lead) compared to glass-body "G" variants of the same JEDEC number. This improves heat transfer efficiency and allows higher sustained power operation in compact layouts.
Is 1N4744P/TR12 RoHS compliant?
Yes, the 1N4744P/TR12 is RoHS compliant, featuring annealed matte-tin plating per MIL-STD-750 Method 2026. The "e3" designation in Microsemi documentation confirms compliance with EU RoHS Directive 2011/65/EU and related restrictions on hazardous substances.
1N4744P/TR12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 15 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 11.4 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AL (DO-41)
1N4744P/TR12 FAQ
1.How can I place an order for 1N4744P/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744P/TR12 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 1N4744P/TR12 reliable?
The price and inventory of 1N4744P/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744P/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4744P/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744P/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744P/TR12?
1N4744P/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744P/TR12 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 1N4744P/TR12?
For technical support, including 1N4744P/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744P/TR12 requirements.
6.How does Aetrix verify that 1N4744P/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4744P/TR12 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 1N4744P/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4744P/TR12?
All 1N4744P/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744P/TR12, 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 1N4744P/TR12 part is unused and in its original packaging.
Return procedure for 1N4744P/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744P/TR12 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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Diodes Incorporated
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