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Microchip Technology 1N4747PE3/TR8
- Part No.:
- 1N4747PE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4747PE3/TR8.pdf
- Description:
- DIODE ZENER 20V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,450
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Product details
Overview
1N4747PE3/TR8 from Microsemi is a 20 V, 1 W plastic-encapsulated Zener diode with ±5% voltage tolerance, 22 Ω dynamic impedance at 12.5 mA test current, and 0.25 A maximum regulator current at 50°C. It operates from –65°C to +150°C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N4747PE3/TR8 datasheet, 1N4747PE3/TR8 pinout, 1N4747PE3/TR8 application, or 1N4747PE3/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45°C/W junction-to-lead), surge current rating (225 mA), RoHS-compliant matte-tin plating, and DO-41 axial-leaded package compatibility with standard through-hole PCB assembly.
Technical Context
This discrete Zener diode functions as a two-terminal voltage regulator by maintaining a stable reverse-biased breakdown voltage across its cathode–anode terminals. Its 20 V nominal Zener voltage is specified at 12.5 mA test current (IZT) with 22 Ω dynamic impedance (ZZT), ensuring predictable regulation under varying load conditions.
The device exhibits a temperature coefficient near zero (per Figure 3 of datasheet), making it suitable for stable reference applications. Its 45°C/W junction-to-lead thermal resistance and 105°C/W junction-to-ambient rating on FR4 enable reliable operation up to 150°C ambient when mounted with 3/8″ lead length or proper copper pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% at IZT = 12.5 mA - defines regulated output voltage in shunt regulator circuits |
| Power Dissipation | 1.0 W at TL < 105°C - sets maximum continuous power handling with 3/8″ lead length |
| Dynamic Impedance | 22 Ω at IZT = 12.5 mA - determines output voltage variation under load current changes |
| Max Regulator Current | 0.25 A at TA = 50°C - limits safe DC current in voltage-clamp or reference configurations |
| Thermal Resistance | 45°C/W junction-to-lead - enables thermal design using lead conduction path |
| Reverse Surge Current | 225 mA (½-sine, 1/120 s) - defines transient overvoltage clamping capability |
| Operating Temperature | –65°C to +150°C - supports 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 | Forward conduction terminal / Zener cathode reference | Connected to circuit ground or lower-potential node in shunt regulation |
| Cathode | Zener breakdown terminal | Banded end; connected to input voltage source to clamp or regulate output |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N47xxA series mechanical and electrical specs |
| RoHS-compliant "e3" suffix | Matte-tin plating meets EU RoHS Directive 2011/65/EU without lead or hazardous substances |
| Moisture sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT handling and storage |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - withstands human-body-model ESD events without degradation |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body (G-suffix) variants - improves power derating margin |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or forward converter feedback networks via optocoupler-coupled TL431 replacement. IC Role / Device Role / Timing Role: Zener diode provides precise 20 V reference to bias optocoupler LED, enabling closed-loop regulation. Use Value: ±5% tolerance and low dynamic impedance ensure <±1% output voltage drift over line/load/temperature. | Use Scenario: Protecting microcontroller I/O pins or analog front-end inputs from transient surges exceeding 20 V. IC Role / Device Role / Timing Role: Shunt clamp that conducts excess current above 20 V to ground, limiting voltage seen by downstream ICs. Use Value: 225 mA surge rating and 45°C/W thermal resistance allow reliable single-pulse clamping without thermal runaway. |
| Industrial Sensor Reference | Programmable Logic Controller (PLC) Input Conditioning |
Use Scenario: Providing stable excitation voltage for resistive bridge sensors (e.g., strain gauges) in harsh factory environments. IC Role / Device Role / Timing Role: Low-drift 20 V Zener reference supplies constant current to sensor bridges independent of supply rail fluctuations. Use Value: –65°C to +150°C operating range and zero-TC region near 20 V minimize reference drift across ambient extremes. | Use Scenario: Level-shifting and voltage-limiting 24 V DC field signals before entering PLC digital input modules. IC Role / Device Role / Timing Role: Clamps input transients to 20 V while allowing normal 24 V logic detection via series resistor. Use Value: DO-41 axial package enables direct through-hole mounting on DIN-rail mount PCBs with high vibration tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4747A | No "e3" RoHS suffix; Sn/Pb terminations; same VZ, IZT, ZZT, and package | Not compliant with RoHS Directive; requires leaded solder process | Select only if legacy leaded assembly is mandated and RoHS exemption applies |
| MMSZ4704T1G | Surface-mount SOD-123 package; 20 V ±5%; 500 mW rating; 30 Ω ZZT at 1 mA | Lower power and different thermal profile; unsuitable for 1 W continuous dissipation | Choose for space-constrained PCBs where 500 mW suffices and reflow is preferred over through-hole |
Compared with 1N4747A and MMSZ4704T1G, the 1N4747PE3/TR8 delivers full 1 W power handling in a RoHS-compliant through-hole package with superior thermal resistance-making it optimal for industrial power supplies requiring long-term reliability and regulatory compliance.
Availability
1N4747PE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, PLC input conditioning, sensor reference circuits, and overvoltage protection requiring stable component supply across extended production lifecycles.
Supply support for 1N4747PE3/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 designed specifically for robust, cost-effective voltage regulation in mission-critical power systems where thermal stability, ESD immunity, and JEDEC-standard packaging are essential.
FAQ
What is the Zener voltage tolerance of the 1N4747PE3/TR8?
The 1N4747PE3/TR8 has a nominal Zener voltage of 20 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is measured at 12.5 mA test current and 25°C lead temperature. The "P" denotes plastic encapsulation, and "e3" confirms RoHS-compliant matte-tin plating. The 1N4747PE3/TR8 maintains this specification across its full operating temperature range.
Does the 1N4747PE3/TR8 require dry packing for moisture sensitivity?
No, the 1N4747PE3/TR8 is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to assembly. Its void-free thermosetting epoxy body and hermetic sealing eliminate moisture absorption concerns, simplifying inventory handling and reflow processes for the 1N4747PE3/TR8.
What is the maximum steady-state current the 1N4747PE3/TR8 can regulate continuously?
The 1N4747PE3/TR8 supports a maximum regulator current (IZM) of 0.25 A at 50°C ambient temperature when mounted on an FR4 board with specified copper pads. At 25°C lead temperature, it sustains 1.0 W dissipation, corresponding to ~50 mA at 20 V. Derating follows the curve in Figure 1 of the datasheet, and the 1N4747PE3/TR8 must be applied within these thermal limits for long-term reliability.
Can the 1N4747PE3/TR8 be used as a direct replacement for the 1N4747A?
Yes, the 1N4747PE3/TR8 is functionally identical to the 1N4747A in electrical parameters and DO-41 package dimensions, differing only in RoHS-compliant matte-tin plating ("e3") versus traditional Sn/Pb terminations. No PCB layout change is needed, but solder process must match the 1N4747PE3/TR8's lead-free requirements-reflow profile and flux selection must be validated for matte-tin surfaces.
What is the thermal resistance junction-to-ambient for the 1N4747PE3/TR8 on a standard PCB?
When mounted on an FR4 printed circuit board with 1 oz copper, 4 mm² copper pads, and 1 mm track width (25 mm length), the 1N4747PE3/TR8 exhibits a junction-to-ambient thermal resistance of 105°C/W. This value is critical for calculating maximum allowable power dissipation at elevated ambient temperatures and is documented in the "Thermal Resistance" section of the 1N4747PE3/TR8 datasheet.
1N4747PE3/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):
- 20 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 22 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 15.2 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)
1N4747PE3/TR8 FAQ
1.How can I place an order for 1N4747PE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4747PE3/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 1N4747PE3/TR8 reliable?
The price and inventory of 1N4747PE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4747PE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4747PE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4747PE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4747PE3/TR8?
1N4747PE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4747PE3/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 1N4747PE3/TR8?
For technical support, including 1N4747PE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4747PE3/TR8 requirements.
6.How does Aetrix verify that 1N4747PE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4747PE3/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 1N4747PE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4747PE3/TR8?
All 1N4747PE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4747PE3/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 1N4747PE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4747PE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4747PE3/TR8 Tags
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