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Microchip Technology 1N4747P/TR8
- Part No.:
- 1N4747P/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4747P/TR8.pdf
- Description:
- DIODE ZENER 20V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,977
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Product details
Overview
1N4747P/TR8 from Microsemi is a 20 V, 1 W axial-lead Zener diode in DO-41 plastic package 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 provides stable voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4747P/TR8 datasheet, 1N4747P/TR8 pinout, 1N4747P/TR8 application, or 1N4747P/TR8 equivalent, key selection factors include Zener voltage accuracy, thermal resistance (45°C/W junction-to-lead), surge current rating (225 mA), reverse leakage (<5 µA at 15.2 V), and RoHS-compliant "e3" plating option.
Technical Context
This discrete silicon Zener diode operates in reverse breakdown to maintain a stable 20 V reference across a wide current range (12.5 mA to 225 mA). Its DO-41 package enables axial through-hole mounting with cathode band polarity marking and 0.7 g mass.
Designed for operation from –65°C to +150°C, it delivers 1.0 W steady-state power at lead temperature <105°C (3/8″ from body) or ambient <45°C on FR4 board. Forward voltage is ≤1.2 V at 200 mA, and ESD immunity meets MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 20 V ±5% at 12.5 mA - defines precise regulation point for feedback loops and reference rails |
| Power Dissipation | 1.0 W at TL < 105°C - sets maximum continuous thermal load without derating |
| Dynamic Impedance (ZZT) | 22 Ω at IZT = 12.5 mA - determines output voltage stability under varying load current |
| Max Regulator Current (IZM) | 225 mA at TA = 50°C - limits usable current range before thermal runaway |
| Reverse Leakage (IR) | <5 µA at VR = 15.2 V - ensures minimal quiescent power loss in standby mode |
| Thermal Resistance | 45°C/W junction-to-lead - enables accurate thermal design with standard lead length constraints |
| Surge Current (ISM) | 225 mA (½-sine, 1/120 s) - supports transient overvoltage clamping capability |
Pinout & Package
DO-41 (DO-204AL) plastic axial-lead 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 | Non-banded end | Connected to lower-potential node; forward conduction path when biased positive relative to cathode |
| Cathode | Banded end | Connected to higher-potential node during Zener operation; defines regulation polarity and PCB silkscreen orientation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Ensures industry-standard form, fit, and function compatibility across suppliers |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life restrictions for SMT handling |
| Nonsensitive to ESD (MIL-STD-750) | Reduces need for special ESD controls during assembly and testing |
| RoHS-compliant "e3" suffix option | Supports environmental compliance without performance trade-offs |
| Plastic encapsulation (P suffix) | Delivers lower thermal resistance vs. glass-body (G suffix) variants for improved power handling |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator or switching converter error amplifiers. IC Role / Device Role / Timing Role: Zener reference element providing fixed 20 V threshold for comparator or op-amp input. Use Value: Maintains ±5% output regulation accuracy across –65°C to +150°C ambient range with 22 Ω dynamic impedance. | Use Scenario: Clamping transient surges on DC bus lines in industrial control systems. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy above 20 V to ground. Use Value: Withstands 225 mA surge current (½-sine, 1/120 s) and dissipates 1.0 W continuously without degradation. |
| Voltage Monitor Circuit | Signal Level Translation |
Use Scenario: Detecting undervoltage or overvoltage conditions in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision threshold detector using reverse-biased 1N4747P/TR8 as sensing node. Use Value: Low 5 µA leakage at 15.2 V ensures minimal loading on high-impedance sense networks. | Use Scenario: Biasing logic interface between 24 V control rail and 5 V microcontroller input. IC Role / Device Role / Timing Role: Clamp diode limiting input voltage to safe 20 V level before signal conditioning stage. Use Value: 1.2 V forward drop at 200 mA allows reliable low-side clamping without forward conduction interference. |
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 "P" suffix: glass-body DO-35 package; higher thermal resistance (105°C/W junction-to-ambient vs. 45°C/W for 1N4747P/TR8) | Less suitable for high-power-density layouts requiring efficient heat transfer via leads | Select 1N4747A only if legacy glass-body form factor or tighter space constraints around body dominate thermal design |
| MMSZ4702T1G | Surface-mount SOD-123 package; 20 V ±5%, 500 mW rating; 30 Ω ZZT at 1 mA | Lower power handling and different test current - not interchangeable in 1 W designs without derating | Choose MMSZ4702T1G for space-constrained PCBs where 500 mW suffices and reflow compatibility is required |
Compared with 1N4747A and MMSZ4702T1G, the 1N4747P/TR8 offers superior thermal performance in through-hole applications, higher surge current capability (225 mA), and proven reliability in industrial power regulation - making it optimal for 1 W reference and clamp roles where lead-based heat sinking is leveraged.
Availability
1N4747P/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and voltage monitor circuits requiring stable component supply and long-term obsolescence management.
Supply support for 1N4747P/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 1N4747P/TR8 belongs to Microsemi's legacy 1N47xxAP Zener diode family, engineered for robust voltage regulation in harsh-environment power systems where thermal stability, ESD resilience, and JEDEC-standard compliance are critical.
FAQ
What is the Zener voltage tolerance of the 1N4747P/TR8?
The 1N4747P/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 specified at 12.5 mA test current and 25°C lead temperature. The 1N4747P/TR8 maintains this accuracy across its full operating temperature range of –65°C to +150°C, supporting stable reference performance in demanding environments.
Does the 1N4747P/TR8 have RoHS-compliant packaging?
Yes, the 1N4747P/TR8 is available in RoHS-compliant form with an "e3" suffix (e.g., 1N4747P-e3/TR8), featuring annealed matte-tin plating per MIL-STD-750 Method 2026. The base 1N4747P/TR8 part uses standard tin-lead terminations, but RoHS versions are fully qualified and interchangeable in function and form. Both meet UL94V-0 flammability requirements for the epoxy body.
What is the maximum power dissipation of the 1N4747P/TR8 at ambient temperature?
The 1N4747P/TR8 delivers 1.0 W steady-state power only when mounted on an FR4 PCB with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm traces - and only at ambient temperatures below 45°C. Above that, power must be derated linearly to zero at 150°C. At 3/8″ lead length from body, full 1.0 W is allowed up to 105°C lead temperature. This dual-rating reflects its DO-41 thermal design.
How does the 1N4747P/TR8 compare to the glass-body 1N4747A?
The 1N4747P/TR8 uses a plastic DO-41 package offering 45°C/W junction-to-lead thermal resistance, while the glass-body 1N4747A (DO-35) has 105°C/W junction-to-ambient. This makes the 1N4747P/TR8 significantly more effective at conducting heat through leads, enabling higher sustained power in lead-mounted configurations. Both share identical electrical specs, but the 1N4747P/TR8 is moisture-insensitive (MSL 1) and requires no dry pack.
What is the reverse leakage current specification for the 1N4747P/TR8?
The 1N4747P/TR8 specifies a maximum reverse leakage current (IR) of 5 µA at a reverse test voltage (VR) of 15.2 V - 76% of its 20 V Zener voltage. This low leakage ensures minimal parasitic loading in high-impedance reference or monitoring circuits. Measured at 25°C, it remains well within specification across the full –65°C to +150°C operating range, supporting precision analog designs.
1N4747P/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)
1N4747P/TR8 FAQ
1.How can I place an order for 1N4747P/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4747P/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 1N4747P/TR8 reliable?
The price and inventory of 1N4747P/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4747P/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4747P/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4747P/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4747P/TR8?
1N4747P/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4747P/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 1N4747P/TR8?
For technical support, including 1N4747P/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4747P/TR8 requirements.
6.How does Aetrix verify that 1N4747P/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4747P/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 1N4747P/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4747P/TR8?
All 1N4747P/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4747P/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 1N4747P/TR8 part is unused and in its original packaging.
Return procedure for 1N4747P/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4747P/TR8 Tags
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