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Microchip Technology 1N4744AP/TR12
- Part No.:
- 1N4744AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744AP/TR12.pdf
- Description:
- DIODE ZENER 15V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:4,791
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Product details
Overview
1N4744AP/TR12 from Microsemi is a 15 V, 1 W plastic-encapsulated Zener diode with ±5% voltage tolerance, 14 Ω dynamic impedance at 17 mA test current, and 0.25 A maximum regulator current at 50°C. It operates from –65°C to +150°C and is used for precision voltage reference and overvoltage protection in DC power supplies and analog signal conditioning circuits.
For engineers reviewing the 1N4744AP/TR12 datasheet, 1N4744AP/TR12 pinout, 1N4744AP/TR12 application, or 1N4744AP/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45°C/W junction-to-lead), surge current rating (304 mA), RoHS-compliant "e3" plating, and DO-41 axial-leaded package compatibility with manual and wave soldering.
Technical Context
This discrete Zener diode regulates voltage by operating in reverse breakdown with sharp knee characteristics confirmed by dual-point impedance measurement per MicroNote 202. Its 15 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing, minimizing drift across industrial temperature ranges.
The device delivers stable regulation over 1–200 mA operating current, with forward voltage ≤1.2 V at 200 mA and reverse leakage ≤5 µA at 11.4 V. Thermal performance is defined for both lead-temperature-limited (TL < 105°C) and ambient-temperature-limited (TA < 45°C) derating conditions on FR4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V ±5% at 17 mA - defines stable regulation point for feedback loops and reference rails |
| Power Dissipation | 1.0 W at 25°C - supports continuous operation in compact linear regulators without forced cooling |
| Dynamic Impedance (ZZT) | 14 Ω at IZT = 17 mA - ensures low output voltage variation under load transients |
| Max Regulator Current (IZM) | 0.25 A at TA = 50°C - sets safe DC current limit before thermal runaway |
| Reverse Leakage (IR) | ≤5 µA at VR = 11.4 V - guarantees minimal quiescent power loss in standby mode |
| Thermal Resistance (RθJL) | 45°C/W junction-to-lead - enables accurate thermal design with 3/8″ lead length mounting |
| Operating Temperature | –65°C to +150°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
Package: DO-41 (DO-204AL) plastic axial-leaded case with cathode band marking; moisture sensitivity Level 1 (no dry pack required); RoHS-compliant matte-tin plating; weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node during regulation; carries full load current in shunt configuration |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to unregulated input rail; maintains 15 V relative to anode when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Guarantees mechanical and electrical interchangeability with legacy 1N4744A designs using plastic packaging |
| Low thermal resistance (45°C/W) | Enables higher sustained power delivery than glass-body (G-suffix) variants under identical lead-mount conditions |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during assembly, reducing manufacturing overhead |
| Moisture Level 1 per J-STD-020B | Permits direct placement into reflow or wave soldering without pre-bake, simplifying SMT-compatible through-hole assembly |
| RoHS-compliant "e3" suffix option | Meets EU Directive 2011/65/EU and China RoHS II requirements with annealed matte-tin plating |
Applications
| DC Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Shunt regulation in low-power linear power supplies feeding microcontroller peripherals. IC Role / Device Role / Timing Role: Voltage reference element maintaining stable 15 V rail despite input ripple and load variation. Use Value: Delivers ±5% regulation accuracy with 14 Ω dynamic impedance, reducing output noise below 20 mVpp under 100 mA step loads. |
Use Scenario: Input-stage clamp protecting op-amp inputs from transient surges in sensor interface circuits. IC Role / Device Role / Timing Role: Fast-acting crowbar element limiting voltage to 15.8 V (max VZ + 5%) during ESD events. Use Value: Withstands 304 mA surge current per half-sine pulse, absorbing >1.2 J energy without degradation per MIL-STD-750 Test Method 3019. |
| Reference Voltage Source | Current Source Biasing |
Use Scenario: Precision biasing of transistor amplifiers requiring stable 15 V reference in test equipment. IC Role / Device Role / Timing Role: Low-drift Zener element providing fixed potential for emitter degeneration networks. Use Value: Temperature coefficient near zero crossing minimizes drift to <±0.01%/°C over –25°C to +85°C operating range. |
Use Scenario: Constant-current sink for LED driver circuits where regulation stability outweighs efficiency concerns. IC Role / Device Role / Timing Role: Active current-setting element establishing 17 mA bias via series resistor and Zener voltage drop. Use Value: Maintains ±2% current accuracy over 50–150°C ambient due to tight 5% VZ tolerance and predictable knee impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A (Microsemi) | Same electrical specs but glass-body (DO-35) package; higher RθJA (105°C/W vs. 45°C/W); no "P" suffix | Limited to low-power, free-air applications; unsuitable for high-density PCBs requiring thermal management | Select 1N4744AP/TR12 when board-level thermal dissipation or moisture resilience (Level 1) is required |
| BZX55-C15 (Vishay) | Same 15 V ±5%, 1 W rating; DO-35 package; 20 Ω ZZT; 0.17 A IZM; non-JEDEC registered | Lower surge current (250 mA) and higher impedance reduce transient immunity in protection roles | Choose BZX55-C15 only for cost-sensitive, non-military applications where JEDEC interchangeability is not mandated |
Compared with 1N4744A and BZX55-C15, the 1N4744AP/TR12 offers superior thermal performance and JEDEC compliance, making it preferred for industrial power supplies and military-grade designs requiring traceable, moisture-insensitive components.
Availability
1N4744AP/TR12 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection clamping, and precision reference voltage generation requiring stable component supply across extended temperature ranges and high-reliability production programs.
Supply support for 1N4744AP/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N4744AP/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 JEDEC-standard interchangeability are critical.
FAQ
What is the Zener voltage tolerance and test condition for 1N4744AP/TR12?
The 1N4744AP/TR12 has a nominal Zener voltage of 15 V with ±5% tolerance, measured at 25°C lead temperature (TL) with 17 mA DC test current applied for 90 seconds. This tolerance applies to all units bearing the "A" suffix and is verified per JEDEC registration standards for the 1N47xxAP series.
Does 1N4744AP/TR12 require dry packing before PCB assembly?
No, the 1N4744AP/TR12 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and assembled without dry pack or baking. Its void-free epoxy body and RoHS-compliant plating ensure reliability in standard wave and reflow processes.
What is the maximum surge current rating for 1N4744AP/TR12 and how is it tested?
The 1N4744AP/TR12 supports a maximum reverse surge current (ISM) of 304 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25°C ambient. This rating reflects its capability to absorb transient energy without parametric shift or failure in overvoltage protection applications.
How does the thermal resistance of 1N4744AP/TR12 compare to glass-body Zeners?
The 1N4744AP/TR12 has a junction-to-lead thermal resistance of 45°C/W at 3/8″ lead length, significantly lower than glass-body equivalents like 1N4744A (105°C/W). This allows 1N4744AP/TR12 to sustain higher continuous power in thermally constrained layouts without exceeding junction temperature limits.
Is 1N4744AP/TR12 compatible with automated tape-and-reel handling?
Yes, the "TR12" suffix indicates EIA-296-compliant tape-and-reel packaging with 12 mm carrier tape width, enabling compatibility with standard pick-and-place equipment. Each reel contains 10,000 units and supports both manual and automated through-hole insertion processes.
1N4744AP/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:
- ±5%
- 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)
1N4744AP/TR12 FAQ
1.How can I place an order for 1N4744AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744AP/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 1N4744AP/TR12 reliable?
The price and inventory of 1N4744AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4744AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744AP/TR12?
1N4744AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744AP/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 1N4744AP/TR12?
For technical support, including 1N4744AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744AP/TR12 requirements.
6.How does Aetrix verify that 1N4744AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4744AP/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 1N4744AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4744AP/TR12?
All 1N4744AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744AP/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 1N4744AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4744AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744AP/TR12 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
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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Diodes Incorporated
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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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Diodes Incorporated
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