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Microchip Technology 1N4743E3/TR13
- Part No.:
- 1N4743E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743E3/TR13.pdf
- Description:
- DIODE ZENER 13V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,398
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Product details
Overview
1N4743E3/TR13 from Microsemi is a 13 V, 5% tolerance, 1 W axial-lead silicon Zener diode in DO-41 package, rated for 19 mA test current (IZT), 10 Ω dynamic impedance (ZZT), and 344 mA maximum regulator current (IZM) at 50°C. It provides stable voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.
For engineers reviewing the 1N4743E3/TR13 datasheet, 1N4743E3/TR13 pinout, 1N4743E3/TR13 application, or 1N4743E3/TR13 equivalent, key selection factors include its 13 V nominal Zener voltage, 19 mA IZT, 10 Ω ZZT at IZT, -65°C to +150°C operating temperature range, and RoHS-compliant matte-tin plating with tape-and-reel packaging (TR13).
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 13 V reference across a wide current range (0.25 mA to 344 mA). Its 10 Ω dynamic impedance at 19 mA ensures low output variation under load transients, while its 45 °C/W junction-to-lead thermal resistance supports reliable 1 W dissipation at TL < 105°C with 3/8" lead length.
The device features a cathode band marking, 1.2 V forward voltage max at 200 mA, and meets MIL-STD-750 Method 1020 for ESD insensitivity. Moisture sensitivity is Level 1 per J-STD-020B-no dry pack required-and it uses void-free UL94V-0 epoxy encapsulation with tin-lead or RoHS-compliant annealed matte-tin terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 13 V ±5% at 19 mA - defines precise regulation point for feedback and reference circuits |
| Power Dissipation | 1.0 W at TL < 105°C - enables compact linear regulator designs without forced cooling |
| Dynamic Impedance (ZZT) | 10 Ω at IZT = 19 mA - minimizes output voltage deviation during current changes |
| Max Regulator Current (IZM) | 344 mA at TA = 50°C - sets upper limit for sustained regulation current in protection circuits |
| Operating Temperature | -65°C to +150°C - supports deployment in automotive engine bays and industrial control enclosures |
| Thermal Resistance | 45 °C/W junction-to-lead - allows direct thermal path to PCB copper or heatsink via leads |
| Forward Voltage | ≤1.2 V at 200 mA - ensures predictable conduction behavior in dual-direction clamp configurations |
Pinout & Package
Package: DO-41 (DO-204AL), axial-lead plastic molded case with cathode band marking; RoHS-compliant matte-tin plating; weight 0.7 g; tape-and-reel packaging per EIA-296 (TR13 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-biased input terminal | Connected to lower-potential node; carries full Zener current during regulation |
| Cathode | Regulated output terminal | Banded end; held at stable 13 V above anode potential when reverse-biased above Vz |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC 1N47xxA compliance | Guarantees interoperability with legacy designs using standard 1 W Zener footprints and drive conditions |
| RoHS-compliant "e3" suffix | Meets EU RoHS Directive 2011/65/EU with annealed matte-tin plating, no lead or hazardous substances |
| Moisture Sensitivity Level 1 | Enables immediate PCB assembly without baking-reduces manufacturing overhead and moisture-related failures |
| Nonsensitive to ESD | Withstands handling per MIL-STD-750 Method 1020, eliminating need for special ESD controls in production |
| Plastic P-suffix construction | Delivers lower thermal resistance vs. glass-body (G-suffix) variants-improves power handling reliability |
Applications
| Power Supply Feedback | Overvoltage Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference element providing stable 13 V threshold to drive optocoupler LED. Use Value: Maintains ±5% output regulation across line/load/temperature with 10 Ω dynamic impedance limiting feedback error. | Use Scenario: Placed across MOSFET gate-source or IC supply rail to prevent destructive overvoltage events. IC Role / Device Role / Timing Role: Shunt clamping device that conducts above 13 V to divert surge current away from sensitive nodes. Use Value: Limits transient voltage to ≤13.7 V (Vz + ΔV due to ZZT × ISM) during 344 mA surges, protecting downstream components. |
| Voltage Reference Generator | Current Source Biasing |
Use Scenario: Paired with a series resistor to generate a stable bias voltage for op-amp comparators or ADC references. IC Role / Device Role / Timing Role: Precision shunt reference establishing fixed 13 V node independent of supply variation. Use Value: Delivers <±0.65 V total variation (5% tolerance + tempco) over -65°C to +150°C, enabling robust analog sensing. | Use Scenario: Configured with a transistor base-emitter junction to set constant collector current in amplifier stages. IC Role / Device Role / Timing Role: Stable voltage source defining emitter-base voltage drop for current mirror accuracy. Use Value: Enables <1% current matching error across temperature due to matched thermal coefficients between Zener and B-E junction. |
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 "e3" RoHS suffix; Sn/Pb plating; same Vz, IZT, ZZT, and package | Not compliant with RoHS Directive; requires exemption documentation for EU markets | Select only if legacy Sn/Pb assembly process is mandated and RoHS compliance is not required |
| MMSZ4703T1G | Surface-mount SOD-123 package; 13 V ±5%; 500 mW rating; 30 Ω ZZT at 5 mA | Lower power rating and higher dynamic impedance limit use to low-current references or signal-level clamping | Choose for space-constrained PCBs where 1 W dissipation is unnecessary and reflow compatibility is critical |
Compared with 1N4743A and MMSZ4703T1G, the 1N4743E3/TR13 uniquely combines RoHS compliance, 1 W power handling, low 10 Ω impedance at 19 mA, and axial-lead DO-41 mechanical robustness-making it optimal for through-hole industrial power supplies requiring long-term regulatory and thermal reliability.
Availability
1N4743E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom line-card voltage references requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N4743E3/TR13 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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N47xxE3 series belongs to Microsemi's legacy silicon Zener diode product line, engineered for precision voltage regulation in harsh-environment power systems where stability, thermal resilience, and JEDEC-standard interoperability are critical.
FAQ
What is the Zener voltage tolerance of the 1N4743E3/TR13?
The 1N4743E3/TR13 has a nominal Zener voltage of 13 V with a ±5% tolerance, as confirmed by the "A" suffix in its JEDEC designation and verified in the Electrical Characteristics table on page 2 of the Microsemi datasheet. This tolerance applies at 25°C lead temperature with 19 mA test current and defines the allowable deviation in regulation voltage under standard operating conditions.
Does the 1N4743E3/TR13 require dry packing before PCB assembly?
No, the 1N4743E3/TR13 does not require dry packing before PCB assembly because it is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B. This classification-stated explicitly in the Features section of the Microsemi datasheet-means the device can be stored and assembled indefinitely without baking, simplifying manufacturing logistics and reducing risk of popcorning.
What is the maximum continuous Zener current for the 1N4743E3/TR13 at 50°C ambient?
The maximum continuous Zener current for the 1N4743E3/TR13 at 50°C ambient temperature is 344 mA, as specified in the "MAXIMUM REGULATOR CURRENT (IZM)" column of the Electrical Characteristics table. This value reflects the peak DC current the device can sustain while maintaining regulation within thermal limits on a standard FR4 board with defined copper layout.
How does the thermal resistance of the 1N4743E3/TR13 affect its power derating?
The 1N4743E3/TR13 has a junction-to-lead thermal resistance of 45 °C/W, meaning each watt of dissipated power raises the junction temperature 45°C above lead temperature. Per Figure 1 in the datasheet, this results in linear derating above 105°C lead temperature, reducing usable power to zero at 150°C junction-requiring thermal design that maintains TL ≤ 105°C for full 1 W operation.
Is the 1N4743E3/TR13 compatible with lead-free reflow soldering processes?
Yes, the 1N4743E3/TR13 is compatible with lead-free reflow soldering: its RoHS-compliant "e3" suffix denotes annealed matte-tin plating qualified per MIL-STD-750 Method 2026, and the datasheet specifies a maximum solder temperature of 260°C for 10 seconds-fully aligned with IPC-J-STD-020 Class 3 reflow profiles for lead-free assembly.
1N4743E3/TR13 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)
1N4743E3/TR13 FAQ
1.How can I place an order for 1N4743E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743E3/TR13 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 1N4743E3/TR13 reliable?
The price and inventory of 1N4743E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743E3/TR13 is usually 5 days.
3.What payment methods are accepted for 1N4743E3/TR13?
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1N4743E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743E3/TR13 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 1N4743E3/TR13?
For technical support, including 1N4743E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743E3/TR13 requirements.
6.How does Aetrix verify that 1N4743E3/TR13 is sourced from the original manufacturer or authorized distributors?
All 1N4743E3/TR13 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 1N4743E3/TR13 meets industry standards.
7.What is the process for return or replacement of 1N4743E3/TR13?
All 1N4743E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743E3/TR13, 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 1N4743E3/TR13 part is unused and in its original packaging.
Return procedure for 1N4743E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4743E3/TR13 Tags
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MMBZ5240B-7-F
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