My Inquiry
My Account
Microchip Technology 1N4744P/TR8
- Part No.:
- 1N4744P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4744P/TR8.pdf
- Description:
- DIODE ZENER 15V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:5,242
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N4744P/TR8 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 across industrial temperature range.
For engineers reviewing the 1N4744P/TR8 datasheet, 1N4744P/TR8 pinout, 1N4744P/TR8 application, or 1N4744P/TR8 equivalent, key selection factors include its 15 V nominal Zener voltage, 1 W power rating at 25°C, DO-41 mechanical compatibility, RoHS-compliant "e3" plating option, and tape-and-reel packaging (TR8) for automated assembly.
Technical Context
The 1N4744P/TR8 operates as a reverse-biased voltage reference device with sharp breakdown knee at 15 V, specified at 17 mA test current (IZT). Its thermal resistance is 45°C/W junction-to-lead (3/8" lead length) and 105°C/W junction-to-ambient on FR4 board, enabling reliable operation up to +150°C storage temperature.
It features moisture sensitivity Level 1 per J-STD-020B (no dry pack required), nonsensitive ESD performance per MIL-STD-750 Method 1020, and UL94V-0 epoxy encapsulation. The cathode band marking and tin-lead or matte-tin plating ensure unambiguous polarity and solderability per MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 15 V ±5% at 17 mA - defines precise regulation point for feedback loops and reference rails |
| Power Dissipation | 1.0 W at 25°C - sets maximum continuous DC power handling before thermal derating |
| Dynamic Impedance (Zzt) | 14 Ω at IZT = 17 mA - determines output voltage stability under load current variation |
| Max Regulator Current (Izm) | 0.25 A at TA = 50°C - limits usable current range in shunt regulation applications |
| Thermal Resistance | 45°C/W junction-to-lead - informs heatsinking requirements when leads serve as thermal path |
| Operating Temperature | –65°C to +150°C - supports deployment in automotive under-hood and industrial control environments |
| Reverse Leakage | 5 μA max at VR = 11.4 V - ensures low quiescent current in standby or high-impedance bias networks |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / voltage reference output | Banded end; connected to higher-potential side; delivers stable 15 V when reverse-biased above knee |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Fully compliant with JEDEC 1N4744A specification, ensuring cross-manufacturer interchangeability |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body (G-suffix) variants-improves power handling in compact layouts |
| Tape-and-reel packaging (TR8) | Standard EIA-296 format enables direct use in high-volume SMT pick-and-place systems |
| Moisture Level 1 rating | No dry-pack or baking required prior to reflow-reduces manufacturing overhead and floor-life constraints |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020-eliminates need for special ESD handling in production |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Zener reference element providing fixed 15 V reference for error amplifier input. Use Value: Maintains ±5% output accuracy across –65°C to +150°C and 1 mA–250 mA load range. | Use Scenario: Protecting microcontroller I/O pins or sensor inputs from transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess current when voltage exceeds 15 V. Use Value: Limits peak voltage to ≤15.7 V (Vz + ΔVz) with 14 Ω dynamic impedance, minimizing stress on downstream components. |
| DC-DC Converter Feedback | Industrial Sensor Excitation |
Use Scenario: Setting output voltage in isolated flyback or forward converter secondary-side regulation. IC Role / Device Role / Timing Role: Precision voltage reference for optocoupler-coupled feedback loop. Use Value: Enables stable 15 V output with <1% line/load regulation drift due to low ZZT and tight Vz tolerance. | Use Scenario: Providing stable excitation voltage for resistive bridge sensors (e.g., strain gauges, RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Low-noise, thermally stable voltage source for ratiometric measurement circuits. Use Value: Delivers 15 V reference with <±0.01%/°C tempco and <5 μA leakage-preserving measurement resolution. |
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 TR8 tape-and-reel; bulk or ammo pack only; identical electrical specs and DO-41 package | Not suitable for automated SMT placement without repackaging | Select 1N4744P/TR8 when requiring factory-loaded reel for pick-and-place integration |
| MMSZ4702T1G | Surface-mount SOD-123 package; 15 V ±5%; 500 mW rating; 30 Ω Zzt at 5 mA | Lower power and different thermal profile-requires PCB layout revision and derating analysis | Choose MMSZ4702T1G only when space-constrained designs mandate SMT and 500 mW suffices |
Compared with 1N4744A and MMSZ4702T1G, the 1N4744P/TR8 uniquely combines 1 W power capability, DO-41 axial form factor, and factory tape-and-reel delivery-making it optimal for through-hole or mixed-technology power supply designs requiring volume assembly readiness.
Availability
1N4744P/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controller (PLC) analog input stages requiring stable component supply and long-term obsolescence management.
Supply support for 1N4744P/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 timing solutions for aerospace, defense, and industrial markets.
The 1N4744P/TR8 belongs to Microsemi's legacy 1N47xxAP Zener series-designed specifically for robust, cost-effective voltage regulation in harsh-environment power conditioning and protection circuits.
FAQ
What is the Zener voltage tolerance of the 1N4744P/TR8?
The 1N4744P/TR8 has a nominal Zener voltage of 15 V with a tolerance of ±5%, as confirmed by its "A" suffix per JEDEC registration. This tolerance applies at 25°C lead temperature with 17 mA test current and is maintained across its full operating temperature range of –65°C to +150°C.
Does the 1N4744P/TR8 require dry packing before reflow soldering?
No, the 1N4744P/TR8 does not require dry packing. It is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and processed without baking or humidity-controlled handling-reducing manufacturing complexity and floor-life risk.
What is the maximum surge current rating for the 1N4744P/TR8?
The 1N4744P/TR8 has a maximum surge current (ISM) of 304 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient. This rating supports transient suppression in power rail clamp applications where short-duration overvoltages occur.
Can the 1N4744P/TR8 be used in surface-mount designs?
No-the 1N4744P/TR8 uses a DO-41 axial-lead package and is not compatible with surface-mount assembly. For SMT equivalents, consider the MMSZ4702T1G (SOD-123, 500 mW) or SMAJ4744A (SMA, 1 W), both requiring layout and thermal validation.
What does the "TR8" suffix indicate in 1N4744P/TR8?
The "TR8" suffix indicates tape-and-reel packaging per EIA-296 standard, with 8 mm carrier tape width and standard orientation for automated pick-and-place equipment. This distinguishes it from bulk or ammo-pack versions and ensures seamless integration into high-volume assembly lines.
1N4744P/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:
- ±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/TR8 FAQ
1.How can I place an order for 1N4744P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4744P/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 1N4744P/TR8 reliable?
The price and inventory of 1N4744P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4744P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4744P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4744P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4744P/TR8?
1N4744P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4744P/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 1N4744P/TR8?
For technical support, including 1N4744P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4744P/TR8 requirements.
6.How does Aetrix verify that 1N4744P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4744P/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 1N4744P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4744P/TR8?
All 1N4744P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4744P/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 1N4744P/TR8 part is unused and in its original packaging.
Return procedure for 1N4744P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4744P/TR8 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
