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Microchip Technology 1N4744CPE3/TR8
- Part No.:
- 1N4744CPE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744CPE3/TR8.pdf
- Description:
- DIODE ZENER 15V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:9,286
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Product details
Overview
1N4744CPE3/TR8 from Microsemi is a 15 V, ±2% tolerance, 1 W axial-lead silicon Zener diode in DO-41 package, rated for 17 mA test current, 14 Ω dynamic impedance at IZT, and 304 mA maximum regulator current at TA = 50°C. It provides stable voltage regulation in power supply reference, overvoltage protection, and voltage-clamping circuits.
For engineers reviewing the 1N4744CPE3/TR8 datasheet, 1N4744CPE3/TR8 pinout, 1N4744CPE3/TR8 application, or 1N4744CPE3/TR8 equivalent, key selection criteria include its tight 2% VZ tolerance, low ZZT of 14 Ω, RoHS-compliant matte-tin plating, TR8 tape-and-reel packaging, and JEDEC-registered DO-41 mechanical form factor.
Technical Context
This Zener operates in reverse breakdown to maintain a stable 15 V reference across a wide current range (0.25–304 mA), with temperature coefficient near zero at this voltage. Its 1 W power rating is derated linearly above 45°C ambient when mounted on FR4 with specified copper pads.
The device uses a void-free thermosetting epoxy case (UL94V-0), features cathode band polarity marking, and meets MIL-STD-750 Method 1020 for ESD insensitivity. Moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1 - no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15 V ±2% at IZT = 17 mA - ensures precise reference accuracy for feedback loops and clamping thresholds |
| Power Dissipation | 1.0 W at TL < 105°C (3/8″ lead length) - defines thermal design margin for PCB trace width and heatsinking |
| Dynamic Impedance (ZZT) | 14 Ω at IZT = 17 mA - determines output voltage variation under load transients |
| Max Regulator Current (IZM) | 304 mA at TA = 50°C - sets upper limit for sustained regulation without thermal runaway |
| Reverse Leakage (IR) | <5 μA at VR = 11.4 V - guarantees minimal quiescent current in standby or high-impedance bias networks |
| Thermal Resistance | 105 °C/W junction-to-ambient (FR4, 1 oz Cu, 4 mm² pad) - enables thermal modeling for reliability validation |
| Operating Temperature | −65°C to +150°C - supports deployment in automotive under-hood and industrial control environments |
Pinout & Package
Package: DO-41 (JEDEC DO-204AL), axial-lead plastic molded case with cathode band marking; RoHS-compliant annealed matte-tin plating; weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in regulation mode; used as ground reference in shunt regulator topologies |
| Cathode (banded end) | Zener breakdown terminal | Connected to higher-potential rail; reverse-biased to clamp or regulate voltage at 15 V ±2% |
Key Features
| Feature | Design Value |
|---|---|
| Tight 2% Zener voltage tolerance | Reduces calibration overhead in precision reference designs and improves system-level voltage accuracy without trimming |
| RoHS-compliant "e3" suffix | Meets global environmental compliance requirements with matte-tin plating compatible with standard SnPb and lead-free reflow profiles |
| DO-41 package with Level 1 moisture sensitivity | Enables direct placement without baking; simplifies SMT line integration and reduces handling cost |
| 1 W power rating with defined thermal resistance | Supports robust operation in 5–12 V input rails with up to ~100 mW dissipation margin before derating applies |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for additional ESD protection during board assembly and field operation in noisy industrial environments |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Providing stable 15 V reference for op-amp comparators and switching regulator feedback networks in offline AC/DC adapters. IC Role / Device Role / Timing Role: Shunt voltage reference that sinks excess current to hold regulated node at 15 V ±2%. Use Value: Enables ±0.3 V absolute reference accuracy without external trimming, reducing BOM count and calibration steps. | Use Scenario: Clamping transient spikes on 12 V automotive sensor lines exposed to load-dump events. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as crowbar element to divert surge current above 15 V threshold. Use Value: Limits voltage excursion to ≤15.3 V (max), protecting downstream 16 V-rated analog front-ends from damage. |
| Voltage-Level Translation | Signal Conditioning Clamp |
Use Scenario: Biasing logic-level shifters between 3.3 V microcontrollers and 15 V industrial I/O modules. IC Role / Device Role / Timing Role: Cathode-connected to 15 V rail, anode tied to signal path - establishes 15 V ceiling for bidirectional level translation. Use Value: Prevents signal overshoot beyond 15 V while allowing full swing down to 0 V, preserving timing integrity in digital interfaces. | Use Scenario: Protecting ADC inputs from accidental 24 V miswiring in programmable logic controller (PLC) analog input cards. IC Role / Device Role / Timing Role: Low-impedance shunt clamp placed directly at ADC input pin to absorb fault energy. Use Value: Limits input voltage to 15.3 V (max), staying within absolute maximum rating of 16 V typical SAR ADCs without sacrificing bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4744A | Same 15 V, ±5% tolerance; non-RoHS tin-lead plating; no "e3" or "TR8" suffix | Requires lead-free process compatibility verification; lacks tape-and-reel convenience for automated assembly | Select when legacy SnPb assembly is used and tighter tolerance is not required |
| BZX85C15 | 15 V, ±5% tolerance; DO-41 package; 1.3 W rating; higher ZZT (~20 Ω); different thermal resistance spec | Slightly higher power margin but looser regulation accuracy; may require layout review for thermal performance equivalence | Select when cost sensitivity outweighs 2% tolerance requirement and higher surge current capability is beneficial |
Compared with 1N4744CPE3/TR8, the 1N4744A offers identical electrical function but lacks RoHS compliance and tape-and-reel packaging, while BZX85C15 trades tighter tolerance for higher power rating and relaxed impedance - making the 1N4744CPE3/TR8 optimal for precision, lead-free, high-volume production where voltage accuracy and assembly readiness are critical.
Availability
1N4744CPE3/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and signal conditioning applications requiring stable component supply, consistent RoHS compliance, and automated placement support.
Supply support for 1N4744CPE3/TR8 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 discrete components for aerospace, defense, and industrial markets.
The 1N47xx series was designed specifically for general-purpose, high-stability Zener regulation in commercial and ruggedized power systems - emphasizing JEDEC registration, broad voltage coverage, and screening flexibility.
FAQ
What is the Zener voltage tolerance of the 1N4744CPE3/TR8?
The 1N4744CPE3/TR8 has a Zener voltage tolerance of ±2%, as indicated by the "C" suffix in the part number. This means its nominal 15 V breakdown voltage is guaranteed between 14.7 V and 15.3 V when measured at IZT = 17 mA and TL = 25°C. This tighter tolerance supports precision reference designs where calibration drift must be minimized - a key distinction from the ±5% 1N4744A variant.
Does the 1N4744CPE3/TR8 meet RoHS requirements?
Yes, the 1N4744CPE3/TR8 complies with RoHS Directive 2011/65/EU. The "e3" suffix explicitly denotes RoHS-compliant annealed matte-tin plating, verified per Microsemi's documentation. Its void-free thermosetting epoxy case also satisfies UL94V-0 flammability requirements, making the 1N4744CPE3/TR8 suitable for environmentally regulated industrial and consumer electronics production.
What does the "TR8" suffix indicate in 1N4744CPE3/TR8?
The "TR8" suffix indicates tape-and-reel packaging per EIA-296 standard, with 8 mm carrier tape and 1,000 units per reel. This format enables automated pick-and-place assembly and ensures consistent orientation (cathode band facing outward). Unlike bulk or ammo-pack variants, the 1N4744CPE3/TR8 eliminates manual handling risk and supports high-throughput SMT lines - a critical feature for volume manufacturing of the 1N4744CPE3/TR8.
What is the maximum continuous Zener current for the 1N4744CPE3/TR8?
The maximum continuous Zener current (IZM) for the 1N4744CPE3/TR8 is 304 mA at TA = 50°C, derived from its 1.0 W power rating and thermal resistance. At higher ambient temperatures, this value decreases per the derating curve - e.g., ~250 mA at 70°C ambient. Exceeding IZM risks thermal runaway; therefore, proper PCB copper area and airflow must be validated when operating the 1N4744CPE3/TR8 near its power limit.
How is polarity marked on the 1N4744CPE3/TR8?
The 1N4744CPE3/TR8 uses a cathode band (a single dark stripe) near one lead end to indicate polarity. When installed, the banded end is the cathode and must be connected to the higher-potential node for Zener regulation. The opposite (unbanded) lead is the anode. This marking is laser-etched or molded into the DO-41 epoxy body and remains visible after soldering - ensuring correct orientation during both manual and automated placement of the 1N4744CPE3/TR8.
1N4744CPE3/TR8 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:
- ±2%
- 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)
1N4744CPE3/TR8 FAQ
1.How can I place an order for 1N4744CPE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744CPE3/TR8 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 1N4744CPE3/TR8 reliable?
The price and inventory of 1N4744CPE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744CPE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4744CPE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744CPE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744CPE3/TR8?
1N4744CPE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744CPE3/TR8 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 1N4744CPE3/TR8?
For technical support, including 1N4744CPE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744CPE3/TR8 requirements.
6.How does Aetrix verify that 1N4744CPE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4744CPE3/TR8 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 1N4744CPE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4744CPE3/TR8?
All 1N4744CPE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744CPE3/TR8, 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 1N4744CPE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4744CPE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744CPE3/TR8 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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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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