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Microchip Technology 1N4743CPE3/TR12
- Part No.:
- 1N4743CPE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743CPE3/TR12.pdf
- Description:
- DIODE ZENER 13V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,887
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Product details
Overview
1N4743CPE3/TR12 from Microsemi is a 13 V, 2% tolerance, 1 W axial-lead silicon Zener diode in DO-41 package, rated for 19 mA test current, 10 Ω dynamic impedance at IZT, and reverse leakage ≤5 µA at 9.9 V, used for precision voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N4743CPE3/TR12 datasheet, 1N4743CPE3/TR12 pinout, 1N4743CPE3/TR12 application, or 1N4743CPE3/TR12 equivalent, key selection criteria include its ±2% Zener voltage tolerance, 1 W steady-state power rating at TL < 105°C, DO-41 mechanical compatibility, RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR12).
Technical Context
This Zener operates in reverse breakdown to maintain stable 13 V output across 1.0–344 mA DC current range, with sharp knee characteristics verified by dual-point Zener impedance measurement per MicroNote 202. Its thermal resistance is 45 °C/W junction-to-lead (3/8″ lead length) and 105 °C/W junction-to-ambient on FR4 board.
The device features cathode band polarity marking, UL94V-0 void-free epoxy case, and MIL-STD-750 compliant solderability (260 °C/10 s). It is moisture-sensitive Level 1 per J-STD-020B and ESD-nonsensitive per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V ±2% at 19 mA - enables tight-regulation references in feedback loops |
| Power Dissipation | 1.0 W at TL < 105°C - supports continuous operation without forced cooling in compact layouts |
| Dynamic Impedance (ZZT) | 10 Ω at IZT = 19 mA - ensures low output voltage variation under load transients |
| Reverse Leakage (IR) | ≤5 µA at VR = 9.9 V - minimizes quiescent current in high-impedance bias networks |
| Max Regulator Current (IZM) | 344 mA at TA = 50°C - defines safe peak current before thermal runaway |
| Forward Voltage | ≤1.2 V at 200 mA - allows use as clamping diode in bidirectional protection schemes |
| Operating Temp | −65°C to +150°C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
DO-41 (JEDEC 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 | Reference ground node in Zener regulator configuration | Connected to circuit common; forms return path for Zener current |
| Cathode | Regulated output node | Banded end; held at precise 13 V above anode during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener tolerance (C suffix) | Reduces calibration drift in precision analog references vs. standard ±5% (A) parts |
| RoHS-compliant "e3" suffix | Meets EU Directive 2011/65/EU with annealed matte-tin plating, no lead or hazardous substances |
| Tape-and-reel packaging (TR12) | Enables automated SMT placement despite axial form factor via carrier tape indexing |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to assembly, reducing manufacturing cost |
| Nonsensitive to ESD | Withstands handling without special grounding protocols per MIL-STD-750 Method 1020 |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Stabilizing TL431 reference input in isolated flyback converter feedback loop. IC Role / Device Role / Timing Role: Provides fixed 13 V reference to set output voltage accuracy independent of optocoupler CTR variation. Use Value: ±2% tolerance maintains ±1.5% overall output regulation, improving system compliance with IEC 62368-1. | Use Scenario: Biasing bridge amplifier inputs in 4–20 mA transmitter front-end. IC Role / Device Role / Timing Role: Supplies stable excitation voltage to strain gauge bridges under varying ambient temperatures. Use Value: Low 10 Ω ZZT limits reference shift to <10 mV over 0–100 mA load swing, preserving 12-bit ADC linearity. |
| Overvoltage Clamp for MCU I/O | Programmable Threshold Detector |
Use Scenario: Protecting 3.3 V GPIO pins against 12 V rail faults in automotive body control modules. IC Role / Device Role / Timing Role: Shunts transient energy above 13 V to ground before internal ESD structures activate. Use Value: 1 W power rating absorbs 80 V/100 ns pulses per IEC 61000-4-4 Level 4 without degradation. | Use Scenario: Setting trip point for LM393 comparator monitoring battery pack voltage. IC Role / Device Role / Timing Role: Defines precise 13 V threshold for low-battery warning activation. Use Value: Tight 2% tolerance eliminates need for external trimming resistors, reducing BOM count by one component. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4743A | ±5% VZ tolerance, same DO-41 package and 13 V nominal rating | Acceptable where reference stability <±3% suffices; lower cost | Select when budget constraints outweigh precision requirements |
| MMSZ4703T1G | Surface-mount SOD-123, 13 V ±5%, 500 mW PD, 30 Ω ZZT | Requires PCB redesign; unsuitable for >250 mA loads or high-temp ambient | Choose only for space-constrained designs accepting reduced power and regulation performance |
Compared with 1N4743A and MMSZ4703T1G, the 1N4743CPE3/TR12 delivers superior voltage accuracy (±2% vs. ±5%), higher power handling (1 W vs. 500 mW), and lower dynamic impedance (10 Ω vs. 30 Ω), making it optimal for precision analog references where thermal margin and long-term stability are critical.
Availability
1N4743CPE3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, and automotive overvoltage protection requiring stable component supply with full traceability and lifecycle management.
Supply support for 1N4743CPE3/TR12 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 1N47xx series was designed specifically for robust, low-cost voltage regulation in harsh-environment power systems, emphasizing thermal stability, ESD resilience, and JEDEC-standardized mechanical interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N4743CPE3/TR12?
The 1N4743CPE3/TR12 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix in the part number. This means its measured breakdown voltage falls within 12.74 V to 13.26 V at 19 mA test current and 25°C lead temperature, enabling tighter regulation than standard ±5% variants like the 1N4743A.
Does the 1N4743CPE3/TR12 require dry packing before reflow soldering?
No, the 1N4743CPE3/TR12 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it can be stored and processed without dry packing or baking. Its plastic DO-41 encapsulation prevents moisture ingress, eliminating pre-reflow bake cycles and reducing assembly risk.
What is the maximum surge current rating for the 1N4743CPE3/TR12?
The 1N4743CPE3/TR12 has a maximum non-repetitive surge current (ISM) of 344 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient. This rating applies only to short-duration transients and must be derated per the power derating curve in Figure 1 when operating above 45°C ambient.
Can the 1N4743CPE3/TR12 be used in surface-mount designs?
The 1N4743CPE3/TR12 is an axial-lead DO-41 device and not inherently SMT-compatible. However, its TR12 tape-and-reel packaging allows automated placement using axial-component feeders. For true surface-mount implementation, consider Microsemi's SMAJ4743A or MLL4743A equivalents, which share the same electrical specs in SOD-123 or SOD-323 packages.
What does the "e3" suffix indicate in 1N4743CPE3/TR12?
The "e3" suffix in 1N4743CPE3/TR12 indicates RoHS compliance with lead-free matte-tin plating on the leads, conforming to EU Directive 2011/65/EU. It replaces traditional tin-lead finishes while maintaining full solderability per MIL-STD-750 Method 2026 and identical electrical performance to non-e3 versions.
1N4743CPE3/TR12 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)
1N4743CPE3/TR12 FAQ
1.How can I place an order for 1N4743CPE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743CPE3/TR12 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 1N4743CPE3/TR12 reliable?
The price and inventory of 1N4743CPE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743CPE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4743CPE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743CPE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4743CPE3/TR12?
1N4743CPE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743CPE3/TR12 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 1N4743CPE3/TR12?
For technical support, including 1N4743CPE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743CPE3/TR12 requirements.
6.How does Aetrix verify that 1N4743CPE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4743CPE3/TR12 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 1N4743CPE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4743CPE3/TR12?
All 1N4743CPE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743CPE3/TR12, 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 1N4743CPE3/TR12 part is unused and in its original packaging.
Return procedure for 1N4743CPE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4743CPE3/TR12 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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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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