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Microchip Technology 1N4749E3/TR13
- Part No.:
- 1N4749E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4749E3/TR13.pdf
- Description:
- DIODE ZENER 24V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,078
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Product details
Overview
1N4749E3/TR13 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 750 mA maximum regulator current (IZM) at 50°C. It provides stable voltage regulation in power supply reference and overvoltage protection circuits across industrial temperature range.
For engineers reviewing the 1N4749E3/TR13 datasheet, 1N4749E3/TR13 pinout, 1N4749E3/TR13 application, or 1N4749E3/TR13 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45°C/W junction-to-lead), surge current rating (190 mA), RoHS-compliant matte-tin plating, and EIA-296 tape-and-reel packaging with TR13 designation.
Technical Context
This device operates in reverse-biased breakdown mode to maintain a stable 24 V reference across a wide current range (0.25–190 mA). Its 25 Ω dynamic impedance at 10.5 mA ensures low output variation under load transients.
Designed for axial-lead mounting on FR4 PCBs, it exhibits 105°C/W junction-to-ambient thermal resistance with standard 4 mm² copper pads and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required. Polarity is marked by cathode band; regulation requires banded end positive relative to anode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 24 V ±5% at 10.5 mA - defines nominal regulation point with tight production control |
| Power Dissipation | 1.0 W at 25°C lead temperature - sets maximum continuous DC power before derating |
| Dynamic Impedance (ZZT) | 25 Ω at IZT = 10.5 mA - determines output voltage stability under small-signal AC load variations |
| Max Regulator Current (IZM) | 750 mA at TA = 50°C - specifies peak DC current capability before thermal runaway |
| Reverse Surge Current (ISM) | 190 mA (½-sine, 1/120 s) - supports transient overvoltage clamping without failure |
| Thermal Resistance | 45°C/W junction-to-lead (3/8″ lead length) - enables thermal design with discrete lead heatsinking |
| Operating Temperature | −65°C to +150°C - suitable for extended industrial and automotive under-hood environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode indicated by color 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 | Reference ground node | Connected to circuit common; reverse-bias polarity requires cathode at higher potential |
| Cathode | Zener regulation terminal | Banded end; must be held at 24 V above anode to maintain breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Fully compliant with JEDEC 1N47xxA series standards for interchangeability and testing |
| RoHS-compliant "e3" suffix | Matte-tin termination meets EU RoHS Directive 2011/65/EU and lead-free assembly requirements |
| Tape-and-reel packaging | EIA-296 compliant carrier tape (TR13 suffix) enables automated SMT placement of axial devices |
| Level 1 moisture sensitivity | No dry pack or baking required prior to assembly-reduces manufacturing overhead |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - eliminates need for special ESD handling in production |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stable 24 V reference in linear regulator feedback networks and analog sensor excitation circuits. IC Role / Device Role / Timing Role: Zener diode providing precision shunt voltage reference. Use Value: Maintains ±5% output accuracy across −65°C to +150°C with 25 Ω dynamic impedance limiting ripple-induced drift. | Use Scenario: Clamping transient spikes on 24 V DC bus lines in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt overvoltage protector diverting surge current away from sensitive downstream ICs. Use Value: Absorbs 190 mA surge (½-sine, 1/120 s) without degradation, leveraging 1 W power rating and robust DO-41 thermal path. |
| Voltage Monitor Threshold | Signal Level Translation |
Use Scenario: Undervoltage lockout (UVLO) detection in battery-powered equipment using 24 V nominal input. IC Role / Device Role / Timing Role: Zener-based comparator threshold element defining turn-on/off voltage boundaries. Use Value: Delivers repeatable 24 V switching point with <1% hysteresis due to sharp knee impedance (38 Ω at IZK = 0.25 mA). | Use Scenario: Biasing level-shifter circuits interfacing 3.3 V logic with 24 V fieldbus nodes. IC Role / Device Role / Timing Role: Clamp diode establishing fixed offset between logic and higher-voltage domains. Use Value: Provides predictable 24 V clamp with 1.2 V forward drop at 200 mA, enabling clean signal translation without rail collapse. |
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 "e3" RoHS suffix; Sn/Pb termination; same electrical specs and DO-41 package | Not suitable for lead-free assembly; requires Pb-based solder process | Select when legacy Pb-based reflow is used and RoHS compliance is not required |
| MMSZ4702T1G | Surface-mount SOD-123 package; 24 V ±5%; 500 mW rating; 30 Ω ZZT at 5 mA | Limited power handling (0.5 W vs. 1.0 W); lower surge current (100 mA); no axial mounting | Choose for space-constrained PCBs where 1 W dissipation is not needed and SMT is preferred |
Compared with 1N4749A and MMSZ4702T1G, the 1N4749E3/TR13 uniquely combines full 1 W power capability, RoHS-compliant matte-tin plating, EIA-296 tape-and-reel packaging, and JEDEC-standard DO-41 mechanical compatibility-making it optimal for high-reliability through-hole industrial power designs requiring regulatory compliance and supply chain continuity.
Availability
1N4749E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, programmable logic controller (PLC) I/O protection, and battery management systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant procurement.
Supply support for 1N4749E3/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 developed to deliver JEDEC-standardized, high-stability Zener regulation in ruggedized plastic packages for mission-critical power conditioning and protection applications.
FAQ
What is the Zener voltage tolerance of the 1N4749E3/TR13?
The 1N4749E3/TR13 has a nominal Zener voltage of 24 V with a ±5% tolerance, as confirmed by its "A" suffix per JEDEC registration. This tolerance applies at 10.5 mA test current and 25°C lead temperature. The "e3" suffix indicates RoHS-compliant matte-tin plating but does not affect voltage specification. Tighter tolerances (±2%, ±1%) are available with "C" or "D" suffixes, but those are distinct part numbers-not applicable to the 1N4749E3/TR13.
Does the 1N4749E3/TR13 require dry packing before PCB assembly?
No, the 1N4749E3/TR13 does not require dry packing. It is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and assembled indefinitely at ambient conditions without baking. This simplifies handling and reduces manufacturing cost compared to higher-MSL components. The DO-41 plastic encapsulation and void-free epoxy body contribute to this robust moisture resistance.
What is the maximum surge current rating for the 1N4749E3/TR13?
The 1N4749E3/TR13 has a maximum reverse 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 reflects its ability to absorb short-duration overvoltage transients without parametric shift or failure. It exceeds the 150 mA surge rating of the surface-mount MMSZ4702T1G, making the 1N4749E3/TR13 more suitable for harsh industrial environments with frequent line surges.
Can the 1N4749E3/TR13 be used in lead-free reflow processes?
Yes, the 1N4749E3/TR13 is qualified for lead-free reflow. Its "e3" suffix denotes RoHS-compliant annealed matte-tin plating, rated for solder temperatures up to 260°C for 10 seconds-fully compatible with standard Pb-free reflow profiles (e.g., SAC305 peak at 245°C). The DO-41 package body meets UL94V-0 flammability rating, ensuring reliability during thermal cycling. No special preheat or cooling ramp rates are required beyond standard JEDEC guidelines.
What is the thermal resistance from junction to ambient for the 1N4749E3/TR13 on a standard PCB?
When mounted on a standard FR4 PCB with 1 oz copper, 4 mm² copper pads, and 1 mm track width (25 mm length), the 1N4749E3/TR13 exhibits a junction-to-ambient thermal resistance of 105°C/W. This value is critical for calculating safe operating area under continuous DC load. For example, at 500 mA regulator current and 24 V Zener voltage, power dissipation is 12 W-exceeding the 1 W rating-so actual operation must stay within the 1 W limit, with derating applied above 45°C ambient per Figure 1 in the datasheet.
1N4749E3/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:
- ±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)
1N4749E3/TR13 FAQ
1.How can I place an order for 1N4749E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4749E3/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 1N4749E3/TR13 reliable?
The price and inventory of 1N4749E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4749E3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4749E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4749E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4749E3/TR13?
1N4749E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4749E3/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 1N4749E3/TR13?
For technical support, including 1N4749E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4749E3/TR13 requirements.
6.How does Aetrix verify that 1N4749E3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4749E3/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 1N4749E3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4749E3/TR13?
All 1N4749E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4749E3/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 1N4749E3/TR13 part is unused and in its original packaging.
Return procedure for 1N4749E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4749E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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