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Microchip Technology 1N4749CE3/TR13
- Part No.:
- 1N4749CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749CE3/TR13.pdf
- Description:
- DIODE ZENER 24V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,578
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Product details
Overview
1N4749CE3/TR13 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 precise voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4749CE3/TR13 datasheet, 1N4749CE3/TR13 pinout, 1N4749CE3/TR13 application, or 1N4749CE3/TR13 equivalent, key selection criteria include its tight 2% Zener voltage tolerance, low 25 Ω dynamic impedance at 10.5 mA, RoHS-compliant matte-tin plating, axial-leaded DO-41 mechanical form factor, and 750 mA IZM capability under thermal derating conditions.
Technical Context
This Zener operates in reverse breakdown to maintain stable 24 V output across varying load currents from 1 mA to 750 mA, with temperature coefficient of +12 mV/°C typical per Figure 3. Its 25 Ω dynamic impedance ensures minimal output voltage variation under transient current changes.
The device uses void-free thermosetting epoxy encapsulation (UL94V-0), features cathode band polarity marking, and meets MIL-STD-750 Method 1020 for ESD insensitivity. Thermal resistance is 45 °C/W junction-to-lead (3/8" lead length) and 105 °C/W junction-to-ambient on FR4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 24 V ±2% at 10.5 mA - enables precision reference generation with low initial error |
| Power Dissipation | 1.0 W at 25°C - defines maximum steady-state thermal load before derating |
| Dynamic Impedance (ZZT) | 25 Ω @ 10.5 mA - determines output voltage stability under small-signal current variations |
| Max Regulator Current (IZM) | 750 mA at TA = 50°C - sets usable current headroom in shunt regulation applications |
| Reverse Leakage (IR) | 5 μA @ 18.2 V - ensures low standby power loss below knee voltage |
| Thermal Resistance | 45 °C/W junction-to-lead - guides heatsinking requirements for lead-mounted designs |
| Operating Temp Range | −65°C to +150°C - supports deployment in extended industrial and automotive 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, 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 in shunt regulation; reverse-biased during Zener operation |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to higher-potential rail; maintains stable 24 V relative to anode when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Reduces need for post-production trimming in precision reference designs |
| Moisture sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints for SMT assembly |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Enables handling without special static control in standard production environments |
| RoHS-compliant "e3" suffix | Meets global environmental compliance mandates without performance trade-offs |
| Plastic P-suffix construction | Delivers lower thermal resistance than glass-body equivalents for improved power handling |
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 diode acting as shunt voltage reference in error amplifier feedback loop. Use Value: 24 V ±2% output with 25 Ω dynamic impedance ensures <±0.25 V deviation over 10–100 mA load current swing. | Use Scenario: Protecting downstream circuitry from transient voltage spikes exceeding 24 V. IC Role / Device Role / Timing Role: Passive clamping element diverting excess current to ground during overvoltage events. Use Value: 750 mA IZM rating allows safe dissipation of short-duration surges up to 18 W peak (24 V × 750 mA). |
| Signal Level Shifting | Current Source Biasing |
Use Scenario: Establishing fixed DC offset for analog sensor outputs or op-amp input stages. IC Role / Device Role / Timing Role: Voltage reference node defining bias point for differential signal conditioning. Use Value: Low 5 μA leakage at 18.2 V minimizes loading error on high-impedance sensor nodes. | Use Scenario: Setting constant current through LED strings or phototransistor collectors. IC Role / Device Role / Timing Role: Stable voltage source enabling predictable emitter/base bias in constant-current mirror configurations. Use Value: −65°C to +150°C operating range supports reliable biasing in thermally demanding lighting or sensing modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | Same 24 V nominal, but ±5% tolerance (A suffix) vs. ±2% (C suffix); identical DO-41 package and IZM | Acceptable where tighter tolerance not required; lower cost for non-critical references | Select 1N4749CE3/TR13 when ±2% accuracy is mandatory; choose 1N4749A for cost-sensitive general-purpose use |
| MMSZ4702ET1G | Surface-mount SOD-123 package; 24 V ±5%; 500 mW rating; 30 Ω ZZT @ 5 mA | Used in space-constrained PCBs where axial leads are impractical; lower power and impedance specs | Choose MMSZ4702ET1G only for compact layouts accepting reduced power and tolerance; not drop-in compatible |
Compared with 1N4749A and MMSZ4702ET1G, the 1N4749CE3/TR13 uniquely delivers ±2% voltage accuracy in a robust 1 W DO-41 package with proven thermal performance on FR4 boards-making it optimal for industrial-grade shunt references requiring long-term stability and manufacturability.
Availability
1N4749CE3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and analog signal conditioning systems requiring stable component supply with full RoHS compliance and traceable sourcing.
Supply support for 1N4749CE3/TR13 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 series was designed specifically for general-purpose, high-stability Zener regulation in commercial and industrial power systems-emphasizing manufacturability, thermal robustness, and JEDEC-standard compatibility.
FAQ
What is the Zener voltage tolerance of the 1N4749CE3/TR13?
The 1N4749CE3/TR13 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its measured breakdown voltage at 10.5 mA test current falls within 23.52 V to 24.48 V at 25°C lead temperature. This tighter tolerance supports precision reference applications where ±5% variants like 1N4749A would introduce unacceptable error margins.
Does the 1N4749CE3/TR13 require dry packing before PCB assembly?
No, the 1N4749CE3/TR13 does not require dry packing because it is moisture sensitivity level 1 per IPC/JEDEC J-STD-020B. Its void-free thermosetting epoxy body prevents moisture absorption, eliminating floor-life restrictions and bake requirements prior to reflow or wave soldering-simplifying manufacturing logistics for high-volume production.
What is the maximum continuous current the 1N4749CE3/TR13 can regulate at 50°C ambient?
At 50°C ambient temperature, the 1N4749CE3/TR13 supports a maximum continuous regulator current (IZM) of 750 mA. This value is specified in the Electrical Characteristics table and reflects the device's ability to safely dissipate power while maintaining stable 24 V regulation-provided thermal design meets the 105 °C/W junction-to-ambient resistance condition on FR4 board.
How is polarity marked on the 1N4749CE3/TR13?
The 1N4749CE3/TR13 uses a cathode band-typically a single painted stripe near one lead end-to indicate the cathode terminal. During Zener operation, this banded end must be held at a higher potential than the anode. The marking is laser-etched or ink-printed per JEDEC standards and remains visible after standard soldering processes.
Is the 1N4749CE3/TR13 RoHS compliant?
Yes, the 1N4749CE3/TR13 is RoHS compliant, as confirmed by the "e3" suffix in its part number. Microsemi specifies that "e3" denotes RoHS-compliant annealed matte-tin plating on leads, meeting EU Directive 2011/65/EU requirements. Full compliance documentation, including substance declarations, is available from Microchip Technology's product change notices.
1N4749CE3/TR13 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)
1N4749CE3/TR13 FAQ
1.How can I place an order for 1N4749CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749CE3/TR13 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 1N4749CE3/TR13 reliable?
The price and inventory of 1N4749CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749CE3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4749CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749CE3/TR13 transactions.
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4.How is shipping managed for 1N4749CE3/TR13?
1N4749CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749CE3/TR13 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 1N4749CE3/TR13?
For technical support, including 1N4749CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749CE3/TR13 requirements.
6.How does Aetrix verify that 1N4749CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4749CE3/TR13 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 1N4749CE3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4749CE3/TR13?
All 1N4749CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749CE3/TR13, 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 1N4749CE3/TR13 part is unused and in its original packaging.
Return procedure for 1N4749CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749CE3/TR13 Tags
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Diodes Incorporated
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