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Microchip Technology 1N4743PE3/TR8
- Part No.:
- 1N4743PE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743PE3/TR8.pdf
- Description:
- DIODE ZENER 13V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:7,480
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Product details
Overview
1N4743PE3/TR8 from Microsemi is a 13 V, 5% tolerance, 1 W axial-lead silicon Zener diode in DO-41 plastic package, rated for 19 mA test current (IZT), 10 Ω dynamic impedance (ZZT), and 344 mA maximum Zener current (IZM) at 50°C. It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature range (–65°C to +150°C).
For engineers reviewing the 1N4743PE3/TR8 datasheet, 1N4743PE3/TR8 pinout, 1N4743PE3/TR8 application, or 1N4743PE3/TR8 equivalent, key selection factors include its 13 V nominal Zener voltage, 19 mA IZT, 10 Ω ZZT at IZT, 344 mA IZM, and RoHS-compliant matte-tin plating with tape-and-reel packaging (TR8).
Technical Context
This device operates in reverse breakdown to maintain stable voltage under varying load and temperature conditions. Its 13 V Zener voltage is specified at 19 mA test current with ±5% tolerance (A-suffix), and it exhibits low dynamic impedance (10 Ω) ensuring tight regulation near IZT.
Thermal resistance is 45°C/W junction-to-lead (3/8" lead length) and 105°C/W junction-to-ambient on FR4 board; forward voltage is ≤1.2 V at 200 mA. Polarity is marked by cathode band, requiring banded end to be positive during regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V nominal at 19 mA, ±5% tolerance - defines precise regulation point for reference design |
| Power Dissipation | 1.0 W at 25°C, derated linearly above 25°C - sets maximum continuous thermal load |
| Dynamic Impedance (ZZT) | 10 Ω at IZT = 19 mA - determines output voltage variation under small-signal current changes |
| Max Regulator Current (IZM) | 344 mA at TA = 50°C - limits safe operating current before thermal runaway |
| Reverse Leakage (IR) | 5 μA max at VR = 9.9 V - ensures minimal quiescent current in standby regulation |
| Operating Temperature | –65°C to +150°C - supports deployment in harsh industrial and automotive environments |
| Forward Voltage (VF) | ≤1.2 V at IF = 200 mA - defines conduction loss when used in forward-biased clamping |
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, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; carries full Zener current in reverse bias |
| Cathode | Banded end | Connected to higher-potential node during regulation; voltage referenced to this terminal |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxA series | Industry-standard footprint and electrical behavior enabling drop-in compatibility in legacy designs |
| RoHS-compliant "e3" suffix | Matte-tin termination meets EU RoHS Directive 2011/65/EU without lead or hexavalent chromium |
| Tape-and-reel "TR8" packaging | EIA-296 compliant 8 mm tape with 1000 pcs/reel - optimized for automated SMT placement of axial components |
| Moisture Sensitivity Level 1 | No dry pack required per IPC/JEDEC J-STD-020B - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - withstands human-body-model discharges without parameter shift or failure |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator circuits or as precision shunt reference in DC-DC converters. IC Role / Device Role / Timing Role: Zener diode providing fixed 13 V reference point for error amplifier input. Use Value: Delivers ±5% voltage accuracy and 10 Ω dynamic impedance to minimize output drift under load transients. | Use Scenario: Clamping transient surges on 12 V automotive or industrial control bus lines. IC Role / Device Role / Timing Role: Shunt protector diverting excess energy to ground when line voltage exceeds 13 V. Use Value: Withstands 344 mA peak Zener current and operates reliably from –65°C to +150°C in under-hood environments. |
| Voltage Monitor Threshold | Signal Level Translation |
Use Scenario: Detecting undervoltage or overvoltage conditions in microcontroller reset circuits. IC Role / Device Role / Timing Role: Zener-based comparator threshold set to 13 V for system brownout detection. Use Value: Leverages sharp knee characteristic (verified via ZZK = 69 Ω at IZK = 1.0 mA) for repeatable trip points. | Use Scenario: Biasing logic-level interfaces between 3.3 V and 5 V domains using passive level-shifting networks. IC Role / Device Role / Timing Role: Forward-conducting anode-cathode path establishing 1.2 V offset for signal translation. Use Value: Guaranteed ≤1.2 V forward voltage at 200 mA enables predictable DC offset without active circuitry. |
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" (plastic) or "e3" (RoHS) suffix; glass DO-35 body, Sn/Pb plating | Higher thermal resistance (junction-to-ambient ~150°C/W), not RoHS-compliant | Select only if legacy glass-body requirement or non-RoHS production applies |
| MMSZ4702T1G | Surface-mount SOD-123 package, 13 V ±5%, 500 mW rating, 10 Ω ZZT | Lower power (0.5 W), smaller footprint, unsuitable for high-current shunt regulation | Choose for space-constrained PCBs where 344 mA IZM is not required |
Compared with 1N4743A and MMSZ4702T1G, the 1N4743PE3/TR8 offers superior thermal performance (45°C/W junction-to-lead), full 1 W dissipation, RoHS compliance, and tape-and-reel automation support - making it optimal for industrial power rails and legacy-compatible designs requiring robust shunt regulation.
Availability
1N4743PE3/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and test equipment requiring stable component supply with long-term lifecycle continuity.
Supply support for 1N4743PE3/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 for general-purpose voltage regulation in cost-sensitive, high-volume applications while maintaining JEDEC standardization and extended temperature capability.
FAQ
What is the Zener voltage tolerance of the 1N4743PE3/TR8?
The 1N4743PE3/TR8 has a nominal Zener voltage of 13 V with ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This tolerance is verified at 19 mA test current and 25°C lead temperature, and applies across the full operating temperature range of –65°C to +150°C per Microsemi's published specifications.
Does the 1N4743PE3/TR8 require baking before reflow soldering?
No, the 1N4743PE3/TR8 does not require baking prior to reflow. It is moisture sensitivity level (MSL) 1 per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without dry packing or floor-life restrictions - eliminating pre-soldering bake cycles in manufacturing.
What is the maximum Zener current (IZM) for the 1N4743PE3/TR8 at 70°C ambient?
At 70°C ambient temperature, the 1N4743PE3/TR8 must be derated from its 344 mA IZM at 50°C. Using the standard 1 W power rating and 105°C/W junction-to-ambient thermal resistance on FR4, the practical IZM at 70°C is approximately 240 mA - calculated to keep junction temperature below 150°C under steady-state conditions.
Can the 1N4743PE3/TR8 be used in forward-bias applications?
Yes, the 1N4743PE3/TR8 functions as a standard silicon diode in forward bias, with a maximum forward voltage of 1.2 V at 200 mA. This makes it suitable for low-voltage clamping, polarity protection, or simple level-shifting where its predictable VF and rugged construction add value beyond Zener operation.
Is the 1N4743PE3/TR8 pin-compatible with older 1N4743A variants?
Yes, the 1N4743PE3/TR8 shares identical DO-41 mechanical dimensions, axial-lead pinout, and cathode band marking with the legacy 1N4743A. The "P" denotes plastic encapsulation (vs. glass DO-35), and "e3/TR8" adds RoHS plating and tape-and-reel packaging - all without altering electrical pin function or physical mounting.
1N4743PE3/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:
- ±10%
- 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)
1N4743PE3/TR8 FAQ
1.How can I place an order for 1N4743PE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743PE3/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 1N4743PE3/TR8 reliable?
The price and inventory of 1N4743PE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743PE3/TR8 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743PE3/TR8 transactions.
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4.How is shipping managed for 1N4743PE3/TR8?
1N4743PE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743PE3/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 1N4743PE3/TR8?
For technical support, including 1N4743PE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743PE3/TR8 requirements.
6.How does Aetrix verify that 1N4743PE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N4743PE3/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 1N4743PE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N4743PE3/TR8?
All 1N4743PE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743PE3/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 1N4743PE3/TR8 part is unused and in its original packaging.
Return procedure for 1N4743PE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4743PE3/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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BZX84C3V3LT1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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