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Microchip Technology 1N4749CPE3/TR8
- Part No.:
- 1N4749CPE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749CPE3/TR8.pdf
- Description:
- DIODE ZENER 24V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:2,750
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Product details
Overview
1N4749CPE3/TR8 from Microsemi is a 24 V, ±2% 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 750 mA maximum regulator current (IZM) at 50°C. It provides precision voltage regulation in power supply feedback loops, reference circuits, and overvoltage protection.
For engineers reviewing the 1N4749CPE3/TR8 datasheet, 1N4749CPE3/TR8 pinout, 1N4749CPE3/TR8 application, or 1N4749CPE3/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (190 mA), reverse leakage (5 µA @ 18.2 V), and RoHS-compliant matte-tin plating.
Technical Context
This Zener operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 24 V nominal Zener voltage exhibits a positive temperature coefficient above ~5 V, with typical TC of +12 mV/°C per Figure 3 in the datasheet.
The device uses axial-leaded DO-41 packaging with cathode band marking, tin-lead or RoHS-compliant matte-tin terminations, and UL94V-0 epoxy body. Thermal performance is defined at 3/8" (10 mm) lead length from body (45°C/W) or on FR4 board (105°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 24 V ±2% at 10.5 mA - ensures tight regulation in precision references and feedback networks |
| Power Dissipation | 1.0 W at TL < 105°C - supports continuous operation in compact power supplies without forced cooling |
| Dynamic Impedance (ZZT) | 25 Ω @ IZT - low AC impedance improves regulation stability under dynamic load changes |
| Max Reverse Current (IR) | 5 µA @ 18.2 V - minimal leakage preserves accuracy in high-impedance bias/reference nodes |
| Surge Current (ISM) | 190 mA (½-sine, 1/120 s) - withstands transient overloads during startup or fault conditions |
| Thermal Resistance | 45 °C/W junction-to-lead - enables predictable derating when mounted with standard lead length |
| Operating Temp Range | −65°C to +150°C - suitable for industrial and automotive under-hood environments |
Pinout & Package
Package: DO-41 (DO-204AL), axial-leaded plastic encapsulated case with cathode indicated by color band. Moisture sensitivity level 1 - no dry pack required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node; accepts current flow into cathode during Zener conduction |
| Cathode | Regulated output terminal | Banded end; held at stable 24 V relative to anode when reverse-biased above breakdown |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables accurate voltage references without post-manufacturing trimming in 24 V systems |
| RoHS-compliant matte-tin plating | Ensures solderability and long-term reliability under lead-free reflow profiles (260°C/10 s) |
| Level 1 moisture sensitivity | Eliminates baking requirement prior to assembly, reducing manufacturing overhead |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for ESD-protected workstations |
| Plastic P-suffix construction | Delivers lower thermal resistance vs. glass-body variants, improving power handling in same footprint |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Protection |
|---|---|
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 similar shunt regulator. Use Value: ±2% tolerance ensures output stays within ±3% of target under line/load transients and temperature drift. | Use Scenario: Limits voltage spikes on 24 V rail caused by inductive load switching or ESD events. IC Role / Device Role / Timing Role: Shunt clamp placed between rail and ground, conducting only above 24 V breakdown. Use Value: 190 mA surge rating absorbs 100–200 ns transients without degradation, preserving downstream ICs. |
| Precision Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Provides stable excitation voltage for 4–20 mA transmitter circuits requiring low-drift references. IC Role / Device Role / Timing Role: Primary voltage reference source for op-amp-based current loop drivers. Use Value: 25 Ω dynamic impedance minimizes output variation under changing load currents up to 10 mA. | Use Scenario: Supplies regulated 24 V to resistive bridge sensors (e.g., pressure transducers) in PLC analog input modules. IC Role / Device Role / Timing Role: Stable excitation source maintaining constant sensor sensitivity across −40°C to +85°C ambient. Use Value: −65°C to +150°C operating range ensures functionality in extended-temperature industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | Same 24 V nominal, but ±5% tolerance (A suffix) vs. ±2% (C suffix) | Less precise regulation; acceptable where cost priority outweighs accuracy | Select 1N4749A only if system-level calibration compensates for wider voltage spread |
| BZX84-C24 | SOT-23 surface-mount package; 24 V ±5%; 300 mW rating; 80 Ω ZZT | Not drop-in compatible; requires PCB redesign; limited power handling | Choose BZX84-C24 only for space-constrained, low-power designs where DO-41 footprint is unacceptable |
Compared with 1N4749A and BZX84-C24, the 1N4749CPE3/TR8 delivers tighter voltage control, higher surge capability, and proven axial-leaded reliability-making it optimal for industrial power supplies where long-term stability and thermal margin are critical.
Availability
1N4749CPE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, analog sensor interfaces, overvoltage protection circuits, and precision reference designs requiring stable component supply and full traceability.
Supply support for 1N4749CPE3/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 1N47xxAP series was designed specifically for robust, cost-effective voltage regulation in harsh-environment power systems-emphasizing thermal resilience, ESD immunity, and JEDEC-standardized performance.
FAQ
What is the Zener voltage tolerance of the 1N4749CPE3/TR8?
The 1N4749CPE3/TR8 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its nominal 24 V Zener voltage is guaranteed between 23.52 V and 24.48 V when measured at 10.5 mA test current and 25°C lead temperature, per Microsemi's REV C datasheet.
Does the 1N4749CPE3/TR8 require dry packing before SMT assembly?
No, the 1N4749CPE3/TR8 is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not absorb significant moisture during normal factory handling and requires no dry pack or baking prior to assembly-even in humid environments.
What is the maximum surge current rating for the 1N4749CPE3/TR8?
The 1N4749CPE3/TR8 has 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 applies to short-duration transients such as inductive kickback or ESD-induced spikes.
Can the 1N4749CPE3/TR8 be used in place of the 1N4749A?
Yes, the 1N4749CPE3/TR8 is functionally compatible with the 1N4749A and shares identical package, pinout, and nominal voltage-but offers tighter ±2% tolerance versus ±5%. No PCB changes are needed, though system-level accuracy improves due to reduced voltage spread.
What does the "TR8" suffix indicate in 1N4749CPE3/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 supports automated pick-and-place assembly and is RoHS-compliant, matching the "e3" termination specification.
1N4749CPE3/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)
1N4749CPE3/TR8 FAQ
1.How can I place an order for 1N4749CPE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749CPE3/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 1N4749CPE3/TR8 reliable?
The price and inventory of 1N4749CPE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749CPE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4749CPE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749CPE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4749CPE3/TR8?
1N4749CPE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749CPE3/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 1N4749CPE3/TR8?
For technical support, including 1N4749CPE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749CPE3/TR8 requirements.
6.How does Aetrix verify that 1N4749CPE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4749CPE3/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 1N4749CPE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4749CPE3/TR8?
All 1N4749CPE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749CPE3/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 1N4749CPE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4749CPE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749CPE3/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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Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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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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