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Microchip Technology 1N4743CP/TR8
- Part No.:
- 1N4743CP/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743CP/TR8.pdf
- Description:
- DIODE ZENER 13V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:3,158
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Product details
Overview
1N4743CP/TR8 from Microsemi is a 13 V, 1 W plastic-encapsulated Zener diode with ±5% voltage tolerance, 19 mA test current (IZT), and 10 Ω dynamic impedance (ZZT) at IZT. It operates from –65°C to +150°C and regulates voltage in power supply reference, overvoltage protection, and voltage-clamping circuits.
For engineers reviewing the 1N4743CP/TR8 datasheet, 1N4743CP/TR8 pinout, 1N4743CP/TR8 application, or 1N4743CP/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (344 mA), RoHS-compliant "e3" plating, and DO-41 axial-leaded package compatibility with standard through-hole PCB assembly.
Technical Context
This discrete Zener diode functions as a passive voltage reference by operating in reverse breakdown, maintaining stable 13 V regulation across 19 mA test current and up to 344 mA maximum regulator current (IZM) at TA = 50°C. Its 10 Ω dynamic impedance ensures low AC ripple sensitivity under varying load conditions.
The device uses silicon PN-junction construction with void-free thermosetting epoxy encapsulation (UL94V-0), cathode band polarity marking, and tin-lead or RoHS-compliant matte-tin terminations solderable per MIL-STD-750 Method 2026. Thermal performance is specified for 3/8″ (10 mm) lead length from body (45 °C/W) and FR4 board mounting (105 °C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V ±5% at 19 mA - defines nominal regulation point with tight tolerance for precision reference use |
| Power Dissipation | 1.0 W at TL < 105°C - supports continuous operation in compact layouts with adequate lead heatsinking |
| Dynamic Impedance (ZZT) | 10 Ω at IZT = 19 mA - limits output voltage variation under changing load currents |
| Maximum Regulator Current (IZM) | 344 mA at TA = 50°C - sets upper limit for sustained reverse conduction without thermal runaway |
| Thermal Resistance | 45 °C/W junction-to-lead (3/8″ lead length) - enables thermal modeling for lead-frame heat extraction |
| Reverse Leakage Current | 5 μA max at VR = 9.9 V - ensures minimal quiescent power loss below breakdown threshold |
| Forward Voltage | 1.2 V max at IF = 200 mA - defines conduction drop during forward-biased transient events |
Pinout & Package
DO-41 (DO-204AL) axial-leaded plastic 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 | Non-banded end | Connected to lower-potential node in Zener regulation configuration; carries forward current when biased |
| Cathode | Banded end | Connected to higher-potential node; reverse-biased to achieve 13 V breakdown regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Industry-standard footprint and electrical behavior enabling direct substitution in legacy designs |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to assembly |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating and lead-free assembly compatibility |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - withstands typical handling electrostatic discharge without parameter shift |
| Plastic vs. glass thermal advantage | P-suffix devices exhibit lower thermal resistance than G-suffix glass-body equivalents - improves power handling in same footprint |
Applications
| Power Supply Voltage Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or op-amp-based reference circuits. IC Role / Device Role / Timing Role: Passive voltage reference element providing precise 13 V setpoint for error amplifiers. Use Value: ±5% VZ tolerance and 10 Ω ZZT ensure stable regulation despite input ripple and load transients. | Use Scenario: Limiting transient voltage spikes on DC rails caused by inductive switching or ESD events. IC Role / Device Role / Timing Role: Shunt clamping device that conducts above 13 V to divert excess energy to ground. Use Value: 344 mA IZM and 1 W power rating allow absorption of short-duration surges without failure. |
| Signal-Level Voltage Clamp | Current Source Biasing |
Use Scenario: Protecting ADC inputs or logic-level interfaces from signal overdrive beyond rail limits. IC Role / Device Role / Timing Role: Bidirectional clamp (with series resistor) limiting analog input swing to ±13 V range. Use Value: Low 10 Ω dynamic impedance maintains accurate clamping threshold across frequency. | Use Scenario: Establishing stable bias current for transistor amplifiers or LED drivers using constant-voltage drop. IC Role / Device Role / Timing Role: Fixed-voltage drop element in emitter-degeneration or current-mirror reference paths. Use Value: Stable 13 V regulation over –65°C to +150°C enables reliable biasing in industrial temperature environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4743A | No "P" suffix - glass-body DO-35 package; higher thermal resistance (60 °C/W vs. 45 °C/W) | Lower power handling in same layout; not moisture-rated Level 1 | Select only if glass-body heritage or legacy qualification required |
| MMSZ4702T1G | Surface-mount SOD-123 package; 13 V, 500 mW rating; 100 Ω ZZT at 5 mA | Not drop-in compatible; requires PCB redesign; lower power and higher impedance limit regulation fidelity | Choose for space-constrained boards where 1 W dissipation is unnecessary |
Compared with 1N4743A and MMSZ4702T1G, the 1N4743CP/TR8 offers superior thermal performance in through-hole designs, JEDEC-standard DO-41 compatibility, and verified 1 W capability - making it optimal for industrial power rail stabilization where reliability and legacy footprint retention are critical.
Availability
1N4743CP/TR8 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and signal-level clamping applications requiring stable component supply and long-term obsolescence management.
Supply support for 1N4743CP/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 Zener series was designed for robust, standardized voltage regulation in mission-critical power systems where thermal stability, moisture immunity, and JEDEC compliance are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N4743CP/TR8?
The 1N4743CP/TR8 has a nominal Zener voltage of 13 V with a tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This tolerance is measured at 25°C lead temperature with 19 mA test current and ensures predictable regulation across production lots and operating conditions.
Does the 1N4743CP/TR8 require dry packing before PCB assembly?
No, the 1N4743CP/TR8 is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it does not absorb sufficient moisture during ambient storage to require dry packing or baking prior to reflow or wave soldering - simplifying manufacturing logistics.
What is the maximum surge current rating for the 1N4743CP/TR8?
The 1N4743CP/TR8 has a maximum surge current (ISM) rating of 344 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient. This defines its ability to safely absorb short-duration overvoltage transients without degradation.
Is the 1N4743CP/TR8 RoHS compliant?
Yes, the "e3" suffix in 1N4743CP/TR8 confirms RoHS compliance per EU Directive 2011/65/EU. Its terminations use annealed matte-tin plating, and the void-free epoxy body meets UL94V-0 flammability requirements.
How does the thermal resistance of the 1N4743CP/TR8 compare to glass-body variants?
The 1N4743CP/TR8 exhibits 45 °C/W junction-to-lead thermal resistance at 3/8″ lead length, significantly lower than the 60 °C/W of glass-body 1N4743A. This plastic construction advantage allows higher sustained power dissipation in identical mechanical layouts.
1N4743CP/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):
- 13 V
- Tolerance:
- ±2%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 9.9 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)
1N4743CP/TR8 FAQ
1.How can I place an order for 1N4743CP/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743CP/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 1N4743CP/TR8 reliable?
The price and inventory of 1N4743CP/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743CP/TR8 is usually 5 days.
3.What payment methods are accepted for 1N4743CP/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743CP/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4743CP/TR8?
1N4743CP/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743CP/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 1N4743CP/TR8?
For technical support, including 1N4743CP/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743CP/TR8 requirements.
6.How does Aetrix verify that 1N4743CP/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4743CP/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 1N4743CP/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4743CP/TR8?
All 1N4743CP/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743CP/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 1N4743CP/TR8 part is unused and in its original packaging.
Return procedure for 1N4743CP/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4743CP/TR8 Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MM5Z5V1ST1G
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