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Microchip Technology 1N4749CP/TR8
- Part No.:
- 1N4749CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749CP/TR8.pdf
- Description:
- DIODE ZENER 24V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,714
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Product details
Overview
1N4749CP/TR8 from Microsemi is a 24 V, 1 W silicon Zener diode in DO-41 plastic package with ±5% voltage tolerance, 25 Ω dynamic impedance at 10.5 mA test current, and 250 μA maximum reverse leakage at 18.2 V, used for precision voltage regulation in power supply feedback loops and reference circuits.
For engineers reviewing the 1N4749CP/TR8 datasheet, 1N4749CP/TR8 pinout, 1N4749CP/TR8 application, or 1N4749CP/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (190 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging for automated assembly.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable output voltage across varying load and line conditions. It delivers regulated 24 V with 10.5 mA nominal test current and exhibits low dynamic impedance (25 Ω) for tight regulation under dynamic load transients.
Designed for axial-lead mounting on FR4 PCBs, it features 45 °C/W junction-to-lead thermal resistance at 10 mm lead length and 105 °C/W junction-to-ambient when mounted with specified copper pads-enabling reliable 1 W dissipation up to 105 °C lead temperature or 45 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 24 V ±5% at 10.5 mA - ensures stable reference in feedback networks requiring tight DC accuracy |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous operation in compact power supplies without forced cooling |
| Dynamic Impedance (ZZT) | 25 Ω at IZT = 10.5 mA - minimizes output voltage variation during load current changes |
| Reverse Leakage Current | 250 μA max at VR = 18.2 V - guarantees low quiescent loss in high-impedance bias networks |
| Surge Current (ISM) | 190 mA (½-sine, 1/120 s) - withstands transient overvoltage events in unprotected input stages |
| Thermal Resistance | 45 °C/W junction-to-lead - enables direct thermal path to PCB copper for improved reliability |
| Operating Temperature | –65 °C to +150 °C - suitable for industrial and automotive under-hood environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by colored band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse-biased operation requires cathode at higher potential |
| Cathode | Zener regulation terminal / voltage reference output | Banded end; connected to regulated rail or error amplifier input; defines 24 V reference point relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxAP registered construction | Ensures mechanical and electrical interchangeability with legacy 1N47xx designs across manufacturers |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT-compatible handling |
| RoHS-compliant "e3" suffix option | Meets EU Directive 2011/65/EU with annealed matte-tin plating and UL94V-0 epoxy body |
| Tape-and-reel packaging (TR8) | Enables high-speed pick-and-place assembly with EIA-296 standard carrier tape and 8 mm pocket pitch |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ionized workstations in production |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Zener reference element setting precise 24 V threshold for TL431 or error amplifier input. Use Value: Maintains ±1% output regulation across line/load variations due to low 25 Ω dynamic impedance and stable 24 V Zener voltage. | Use Scenario: Clamps transient spikes on 24 V DC bus lines in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt protection device diverting surge energy above 24 V to ground before downstream ICs are damaged. Use Value: Absorbs 190 mA surge pulses without degradation, leveraging 1 W steady-state rating and robust DO-41 thermal path. |
| Low-Power Voltage Reference | Microcontroller Reset Circuit |
Use Scenario: Provides stable 24 V reference for analog-to-digital conversion in sensor signal conditioning front-ends. IC Role / Device Role / Timing Role: Precision shunt reference supplying bias current to op-amp gain stages and ADC reference dividers. Use Value: Delivers <250 μA leakage at 18.2 V and ±5% tolerance, enabling accurate scaling of 0–24 V sensor ranges. | Use Scenario: Generates clean reset pulse for ARM Cortex-M microcontrollers during brown-out recovery. IC Role / Device Role / Timing Role: Zener-based threshold detector triggering reset IC (e.g., MAX809) when supply drops below 24 V × 0.85. Use Value: Stable 24 V Zener voltage and –65 °C to +150 °C operating range ensure deterministic reset behavior across environmental extremes. |
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 "P" suffix → glass-body DO-35 package; higher thermal resistance (60 °C/W vs. 45 °C/W) | Less suitable for high-power-density layouts; requires larger copper area for same thermal performance | Select 1N4749CP/TR8 for plastic DO-41, RoHS compliance, and superior thermal management in space-constrained designs |
| MMSZ4702T1G | Surface-mount SOD-123 package; 24 V ±5%, 500 mW rating; 30 Ω ZZT at 5 mA | Lower power handling and different thermal profile; not drop-in for through-hole boards | Choose MMSZ4702T1G only when board real estate is limited and 500 mW suffices; verify layout compatibility |
Compared with 1N4749A and MMSZ4702T1G, the 1N4749CP/TR8 offers optimal balance of 1 W power capability, DO-41 mechanical robustness, 45 °C/W thermal resistance, and tape-and-reel readiness-making it preferred for industrial power supplies requiring long-term reliability and automated assembly.
Availability
1N4749CP/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection clamps, low-power voltage references, and microcontroller reset circuits requiring stable component supply and full traceability.
Supply support for 1N4749CP/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N47xxAP series was developed to deliver JEDEC-standardized, high-stability Zener regulation in ruggedized plastic packages for mission-critical power management and voltage reference applications.
FAQ
What is the Zener voltage tolerance of the 1N4749CP/TR8?
The 1N4749CP/TR8 has a nominal Zener voltage of 24 V with ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 10.5 mA test current and 25 °C lead temperature, ensuring predictable regulation in feedback and reference circuits where moderate accuracy suffices.
Does the 1N4749CP/TR8 require dry packing before use?
No, the 1N4749CP/TR8 is moisture sensitivity level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or floor-life controls. Its void-free thermosetting epoxy body and Level 1 classification allow immediate use after opening the TR8 tape-and-reel packaging without baking.
What is the maximum surge current rating for the 1N4749CP/TR8?
The 1N4749CP/TR8 has a maximum surge current (ISM) rating of 190 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating enables reliable clamping of short-duration transients in 24 V power rails without permanent degradation.
Is the 1N4749CP/TR8 RoHS compliant?
Yes, the "e3" in the full manufacturer part number confirms RoHS compliance. The 1N4749CP/TR8 uses annealed matte-tin plating on leads and UL94V-0 rated epoxy encapsulation, meeting EU Directive 2011/65/EU requirements without exemptions.
How does the thermal resistance of the 1N4749CP/TR8 compare to glass-body variants?
The 1N4749CP/TR8 has a junction-to-lead thermal resistance of 45 °C/W at 10 mm lead length-significantly lower than the 60 °C/W typical of glass-body 1N4749A (DO-35). This 25% improvement allows higher sustained power dissipation in compact layouts with minimal copper area.
1N4749CP/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:
- ±2%
- 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)
1N4749CP/TR8 FAQ
1.How can I place an order for 1N4749CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749CP/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 1N4749CP/TR8 reliable?
The price and inventory of 1N4749CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4749CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4749CP/TR8?
1N4749CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749CP/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 1N4749CP/TR8?
For technical support, including 1N4749CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749CP/TR8 requirements.
6.How does Aetrix verify that 1N4749CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4749CP/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 1N4749CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4749CP/TR8?
All 1N4749CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749CP/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 1N4749CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4749CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749CP/TR8 Tags
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MM5Z5V1ST1G
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