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Microchip Technology 1N4749P/TR8
- Part No.:
- 1N4749P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749P/TR8.pdf
- Description:
- DIODE ZENER 24V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,602
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Product details
Overview
1N4749P/TR8 from Microsemi is a 24 V, ±5% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 10.5 mA test current (IZT), 25 Ω dynamic impedance (ZZT), and 5 μA reverse leakage at 18.2 V (VR). It provides stable voltage regulation in power supply reference and overvoltage protection circuits across -65°C to +150°C.
For engineers reviewing the 1N4749P/TR8 datasheet, 1N4749P/TR8 pinout, 1N4749P/TR8 application, or 1N4749P/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (190 mA), RoHS-compliant "e3" plating option, and tape-and-reel packaging (TR8 suffix).
Technical Context
This axial-leaded Zener operates in reverse breakdown to maintain a stable 24 V reference across a wide current range (0.25 mA to 190 mA), with sharp knee characteristics verified by dual-point impedance testing per MicroNote 202. Its 45°C/W junction-to-lead thermal resistance enables reliable 1 W dissipation at TL ≤ 105°C with 3/8" lead length.
The device features moisture sensitivity Level 1 per J-STD-020B (no dry pack required), nonsensitive ESD behavior per MIL-STD-750 Method 1020, and UL94V-0 epoxy encapsulation. Cathode polarity is marked by a band; operation requires cathode-positive bias relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% at IZT = 10.5 mA - defines nominal regulation point with tight production control |
| Power Dissipation | 1.0 W at TL < 105°C - supports continuous operation without forced cooling in standard leaded layouts |
| Dynamic Impedance | 25 Ω at IZT - ensures low output voltage variation under load transients |
| Reverse Leakage | 5 μA max at VR = 18.2 V - guarantees minimal quiescent current in standby regulation |
| Surge Current (ISM) | 190 mA (½-sine, 1/120 s) - withstands brief overvoltage events without degradation |
| Thermal Resistance | 45°C/W junction-to-lead - enables thermal design using standard 3/8" lead length mounting |
| Operating Temp | -65°C to +150°C - suitable for industrial, automotive under-hood, and aerospace environments |
Pinout & Package
Package: DO-41 (DO-204AL) plastic axial-leaded case, void-free UL94V-0 epoxy body, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground return path |
| Cathode | Zener breakdown terminal / regulation output node | Banded end; connected to higher-potential side; delivers stable 24 V when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered construction | Fully compliant with 1N47xxA series mechanical and electrical standards for interchangeability |
| Plastic P-suffix advantage | Lower thermal resistance vs. glass-body (G-suffix) variants-enables higher reliability at same power |
| Tape-and-reel packaging | TR8 suffix denotes EIA-296–compliant reel format for automated SMT-compatible through-hole placement |
| RoHS-compliant option | "e3" suffix indicates annealed matte-tin plating meeting EU RoHS Directive 2011/65/EU |
| MIL-PRF-19500 screening | Available with MQ/MX/MV/MSP prefixes for JAN/JANTX/JANTXV/JANS levels-supports defense/aerospace BOMs |
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 precise 24 V setpoint to error amplifier input. Use Value: Maintains ±5% output accuracy over temperature and line/load variations due to low ZZT and stable TC. | Use Scenario: Protecting downstream IC inputs from transient voltage spikes exceeding 24 V. IC Role / Device Role / Timing Role: Shunt clamping device that conducts excess current above 24 V to limit voltage excursion. Use Value: Absorbs 190 mA surge pulses without failure, preserving signal integrity in sensor interface circuits. |
| Voltage Monitor Threshold | Field-Programmable Logic Bias |
Use Scenario: Setting trip point for comparator-based brown-out detection in battery-powered systems. IC Role / Device Role / Timing Role: Stable reference source for comparator non-inverting input in undervoltage lockout (UVLO) circuits. Use Value: Enables accurate 24 V threshold detection across -65°C to +150°C with minimal drift. | Use Scenario: Providing clean, regulated bias voltage to FPGA configuration pins or CPLD I/O banks. IC Role / Device Role / Timing Role: Low-noise DC reference ensuring proper logic-level setup during power-up sequencing. Use Value: Delivers stable 24 V with <5 μA leakage, preventing false configuration states during low-power modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | No TR8 tape-and-reel; bulk or ammo-pack only; identical electrical specs and DO-41 package | Lacks automated placement support; suitable for manual or low-volume prototyping | Select 1N4749A when reel packaging is unnecessary and cost minimization is prioritized |
| BZX85C24 | Same 24 V/1 W rating but TO-204AA (DO-41 equivalent) package; ±5% tolerance; 25 Ω ZZT; 5 μA IR | Manufactured by NXP; identical thermal and electrical performance; RoHS-compliant by default | Choose BZX85C24 for second-source assurance where Microsemi supply continuity is constrained |
Compared with 1N4749P/TR8, the 1N4749A offers identical regulation performance without tape-and-reel convenience, while BZX85C24 provides a functionally equivalent, widely stocked alternative with identical Zener voltage, power, and impedance-but sourced from a different manufacturer and qualified to distinct quality standards.
Availability
1N4749P/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control modules, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4749P/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N47xxA Zener series was designed to deliver JEDEC-standard, high-stability voltage regulation in harsh-environment applications where thermal robustness and long-term parametric consistency are critical.
FAQ
What is the Zener voltage tolerance of the 1N4749P/TR8?
The 1N4749P/TR8 has a nominal Zener voltage of 24 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is guaranteed at 10.5 mA test current and 25°C lead temperature. The 1N4749P/TR8 maintains this specification across its full operating temperature range of -65°C to +150°C, supported by its low temperature coefficient and stable breakdown characteristics.
Does the 1N4749P/TR8 support automated assembly?
Yes, the 1N4749P/TR8 is supplied in EIA-296–compliant tape-and-reel format (denoted by the "TR8" suffix), enabling direct use in high-speed axial-leaded component placement machines. Its DO-41 package dimensions and lead spacing comply with industry-standard feeders, and the RoHS-compliant matte-tin plating ensures reliable solderability at 260°C for 10 seconds per JEDEC J-STD-020.
What is the maximum surge current rating for the 1N4749P/TR8?
The 1N4749P/TR8 is rated for a maximum non-repetitive surge current (ISM) of 190 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25°C ambient. This rating allows the 1N4749P/TR8 to safely clamp transient overvoltages in power rails and signal lines without permanent parameter shift or catastrophic failure.
How does the thermal resistance of the 1N4749P/TR8 compare to glass-body Zeners?
The 1N4749P/TR8 features a junction-to-lead thermal resistance of 45°C/W-significantly lower than glass-body equivalents (e.g., 1N4749G) due to its plastic P-suffix construction. This improved thermal performance allows the 1N4749P/TR8 to sustain full 1 W dissipation at higher ambient temperatures or with shorter lead lengths, enhancing reliability in compact or thermally constrained designs.
Is the 1N4749P/TR8 suitable for military-grade applications?
Yes-the base 1N4749P/TR8 can be ordered with military screening prefixes (e.g., MX for JANTX, MV for JANTXV) per MIL-PRF-19500, enabling use in defense and aerospace systems. These versions undergo extended environmental testing, lot traceability, and enhanced quality assurance. The 1N4749P/TR8 itself meets Level 1 moisture sensitivity and ESD immunity per MIL-STD-750 Method 1020, forming the foundation for qualified variants.
1N4749P/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):
- 24 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 18.2 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)
1N4749P/TR8 FAQ
1.How can I place an order for 1N4749P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749P/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 1N4749P/TR8 reliable?
The price and inventory of 1N4749P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4749P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4749P/TR8?
1N4749P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749P/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 1N4749P/TR8?
For technical support, including 1N4749P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749P/TR8 requirements.
6.How does Aetrix verify that 1N4749P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4749P/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 1N4749P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4749P/TR8?
All 1N4749P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749P/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 1N4749P/TR8 part is unused and in its original packaging.
Return procedure for 1N4749P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749P/TR8 Tags
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