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Microchip Technology 1N4747CP/TR8
- Part No.:
- 1N4747CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4747CP/TR8.pdf
- Description:
- DIODE ZENER 20V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:8,541
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Product details
Overview
1N4747CP/TR8 from Microsemi is a 20 V, 1 W silicon Zener diode in DO-41 plastic package with ±5% voltage tolerance (C suffix), 12.5 mA test current, and 22 Ω dynamic impedance at IZT, used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4747CP/TR8 datasheet, 1N4747CP/TR8 pinout, 1N4747CP/TR8 application, or 1N4747CP/TR8 equivalent, key selection criteria include Zener voltage stability across temperature, low dynamic impedance for tight regulation, axial-leaded DO-41 mechanical compatibility, RoHS-compliant "e3" plating, and tape-and-reel packaging for automated assembly.
Technical Context
This device operates in reverse breakdown to maintain a stable 20 V reference across a wide current range (0.25–225 mA), with thermal resistance of 45 °C/W junction-to-lead (3/8″ lead length) and 105 °C/W junction-to-ambient on FR4 board. Its Zener knee occurs at 0.25 mA with 45 Ω impedance, enabling reliable low-current regulation.
It features moisture sensitivity Level 1 per J-STD-020B (no dry pack required), ESD insensitivity per MIL-STD-750 Method 1020, and UL94V-0 epoxy encapsulation. The cathode band denotes polarity, requiring banded end to be positive during regulation.
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 clamp thresholds |
| Power Dissipation | 1.0 W at TL < 105 °C - supports continuous operation in compact power rails without forced cooling |
| Dynamic Impedance (ZZT) | 22 Ω at IZT = 12.5 mA - ensures minimal output voltage variation under load transients |
| Max Regulator Current (IZM) | 225 mA at TA = 50 °C - sets safe upper limit for shunt current in overvoltage protection |
| Knee Impedance (ZZK) | 45 Ω at IZK = 0.25 mA - enables usable regulation down to microamp-level bias conditions |
| Reverse Leakage (IR) | 5 µA max at VR = 15.2 V - guarantees low standby loss in high-impedance reference nodes |
| Forward Voltage | 1.2 V max at 200 mA - allows use as forward-biased clamp or series diode when needed |
Pinout & Package
Package: DO-41 (DO-204AL) axial-leaded plastic case, 2.2 mm diameter × 5.2 mm body length, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by black band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded lead | Connected to lower-potential node; carries reverse leakage and forward conduction current |
| Cathode | Banded lead | Connected to higher-potential node; establishes regulated Zener voltage drop when reverse biased |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxA registration | Industry-standard footprint and electrical behavior ensures direct replacement in legacy designs |
| Plastic P-suffix construction | Lower thermal resistance vs. glass-body variants improves power handling in confined layouts |
| RoHS-compliant "e3" plating | Meets global environmental compliance without sacrificing solderability or reliability |
| Tape-and-reel TR8 option | Enables high-speed pick-and-place assembly with EIA-296 standard carrier tape |
| MIL-STD-750 ESD immunity | Eliminates need for additional ESD protection in handling and board-level integration |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete op-amp-based regulators. IC Role / Device Role / Timing Role: Provides fixed 20 V reference to error amplifier input for output voltage setpoint accuracy. Use Value: 22 Ω ZZT and ±5% VZ tolerance ensure ≤1% total output drift across line/load/temperature. | Use Scenario: Protecting downstream circuitry from transient voltage spikes on 24 V DC bus lines. IC Role / Device Role / Timing Role: Shunts excess energy above 20 V to ground before sensitive components exceed absolute maximum ratings. Use Value: 225 mA IZM rating supports robust clamping of 100–200 ms surges without thermal runaway. |
| Signal Level Shifting | Current Source Bias |
Use Scenario: Generating a stable 20 V offset for analog sensor signal conditioning stages. IC Role / Device Role / Timing Role: Acts as passive voltage reference in resistor-divider networks feeding instrumentation amplifiers. Use Value: Low 5 µA leakage at 15.2 V ensures minimal loading error in high-impedance divider topologies. | Use Scenario: Establishing constant bias current for LED drivers or transistor amplifiers. IC Role / Device Role / Timing Role: Forms the voltage reference leg of a two-resistor current mirror or emitter-degenerated stage. Use Value: 45 Ω ZZK at 0.25 mA enables stable current setting even at sub-mA operating points. |
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" (plastic) or "TR8" suffix; bulk packaged, non-RoHS plating | Lacks tape-and-reel automation support and modern environmental compliance | Select only for manual prototyping or non-RoHS legacy production |
| BZX55C20 | Same 20 V/5% spec but in DO-35 glass package; higher thermal resistance (65 °C/W) | Less suitable for high-power-density PCBs due to inferior heat dissipation | Prefer where glass-body heritage or tighter long-term stability is prioritized over thermal performance |
Compared with 1N4747A and BZX55C20, the 1N4747CP/TR8 delivers superior thermal management via plastic DO-41 construction and factory-verified RoHS compliance with EIA-296 tape-and-reel-critical for volume SMT manufacturing and industrial-grade reliability.
Availability
1N4747CP/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and analog signal conditioning requiring stable component supply, consistent Zener voltage tolerance, and automated assembly readiness.
Supply support for 1N4747CP/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 general-purpose, cost-effective voltage regulation in commercial and industrial power systems where JEDEC-standard form factor and proven long-term stability are essential.
FAQ
What is the Zener voltage tolerance of the 1N4747CP/TR8?
The 1N4747CP/TR8 has a nominal Zener voltage of 20 V with ±5% tolerance, indicated by the "C" suffix in the part number per Microsemi's documentation. This tolerance applies at 12.5 mA test current and 25 °C lead temperature. The "P" denotes plastic DO-41 packaging, and "TR8" specifies EIA-296 tape-and-reel packaging with 8 mm carrier tape width.
Does the 1N4747CP/TR8 meet RoHS requirements?
Yes, the 1N4747CP/TR8 is RoHS compliant, confirmed by the "e3" designation in Microsemi's official documentation. It uses annealed matte-tin plating instead of tin-lead, satisfying EU Directive 2011/65/EU. The device is moisture-sensitive Level 1 per J-STD-020B and requires no dry pack prior to assembly.
What is the maximum power dissipation for the 1N4747CP/TR8?
The 1N4747CP/TR8 is rated for 1.0 W power dissipation at lead temperature (TL) below 105 °C with 3/8″ (10 mm) lead length from body, or at ambient temperature (TA) below 45 °C when mounted on FR4 with specified copper pad geometry. Derating is required above these temperatures per Figure 1 in the datasheet.
How is polarity marked on the 1N4747CP/TR8?
The 1N4747CP/TR8 uses a cathode band-a visible black stripe near one end of the DO-41 body-to indicate polarity. During Zener regulation, the banded end must be held at higher potential than the opposite (anode) end. This marking is consistent across all 1N47xxAP-series devices and aligns with JEDEC DO-41 mechanical standards.
What is the dynamic impedance of the 1N4747CP/TR8 at its test current?
The dynamic impedance (ZZT) of the 1N4747CP/TR8 is 22 Ω, measured at the specified test current of 12.5 mA and 25 °C. This value reflects the small-signal AC resistance in the Zener breakdown region and directly impacts regulation accuracy under varying load conditions.
1N4747CP/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:
- ±2%
- 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)
1N4747CP/TR8 FAQ
1.How can I place an order for 1N4747CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4747CP/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 1N4747CP/TR8 reliable?
The price and inventory of 1N4747CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4747CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4747CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4747CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4747CP/TR8?
1N4747CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4747CP/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 1N4747CP/TR8?
For technical support, including 1N4747CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4747CP/TR8 requirements.
6.How does Aetrix verify that 1N4747CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4747CP/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 1N4747CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4747CP/TR8?
All 1N4747CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4747CP/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 1N4747CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4747CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4747CP/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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Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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