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Microchip Technology 1N4743AP/TR12
- Part No.:
- 1N4743AP/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4743AP/TR12.pdf
- Description:
- DIODE ZENER 13V 1W DO204AL
- Quantity:
- Payment:
- Shipping:
Inventory:6,459
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Product details
Overview
1N4743AP/TR12 from Microsemi is a 13 V, 5% tolerance, 1 W silicon Zener diode in DO-41 plastic package, rated for 19 mA test current (IZT), 10 Ω dynamic impedance (ZZT), and 0.25 A maximum regulator current (IZM) at 50°C. It provides stable voltage regulation in power supply reference, overvoltage protection, and voltage-clamping circuits across industrial temperature range.
For engineers reviewing the 1N4743AP/TR12 datasheet, 1N4743AP/TR12 pinout, 1N4743AP/TR12 application, or 1N4743AP/TR12 equivalent, key selection factors include its 13 V nominal Zener voltage, DO-41 axial-leaded package with cathode band marking, 45 °C/W junction-to-lead thermal resistance, and RoHS-compliant "e3" plating option confirmed in Microsemi's REV C datasheet.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain a stable 13 V reference across a wide current range (19 mA IZT to 344 mA IZM at TA = 50°C). Its 10 Ω dynamic impedance at IZT ensures low AC ripple sensitivity, while the 0.25 A IZM rating supports transient surge handling per ½-sine wave pulse testing.
The device features a moisture-sensitive Level 1 classification (IPC/JEDEC J-STD-020B), void-free UL94V-0 epoxy body, tin-lead or matte-tin plating, and cathode polarity indicated by a band. Thermal performance is specified at 3/8″ lead length (45 °C/W) and on FR4 board (105 °C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V ±5% at 19 mA - defines precise DC reference point for regulation and clamping |
| Power Dissipation | 1.0 W at TL < 105°C - sets maximum steady-state thermal load on leads |
| Dynamic Impedance (ZZT) | 10 Ω @ IZT - determines AC voltage variation under changing load current |
| Max Regulator Current (IZM) | 344 mA at TA = 50°C - limits peak continuous reverse current before thermal runaway |
| Thermal Resistance | 45 °C/W junction-to-lead - enables thermal design using lead length as heatsink |
| Reverse Leakage (IR) | 5 μA @ 9.9 V - confirms sharp knee and low standby power loss below regulation threshold |
| Operating Temperature | –65°C to +150°C - supports deployment in automotive under-hood and industrial control environments |
Pinout & Package
DO-41 (DO-204AL) plastic axial-leaded package with cathode identified by a single black band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Polarity: banded end is cathode (positive during Zener operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded lead | Connected to lower-potential node; carries forward current when not regulating |
| Cathode | Banded lead | Connected to higher-potential node; reverse-biased to enable Zener breakdown at 13 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N47xxAP series | Ensures cross-manufacturer compatibility and standardized electrical behavior |
| Plastic P-suffix construction | Delivers lower thermal resistance vs. glass-body G-suffix variants for improved power handling |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and simplifies SMT reflow logistics |
| RoHS-compliant "e3" option | Meets global environmental compliance without derating or performance trade-offs |
| Nonsensitive to ESD | Rated per MIL-STD-750 Method 1020 - reduces need for handling safeguards in assembly |
Applications
| Power Supply Reference | Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing feedback voltage in linear regulator circuits or shunt-based DC-DC converters. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 13 V setpoint for error amplifiers. Use Value: Maintains output accuracy within ±5% despite input ripple and load variation due to 10 Ω ZZT and 1 W power rating. |
Use Scenario: Clamping transient spikes on 12 V automotive or industrial bus lines. IC Role / Device Role / Timing Role: Reverse-biased voltage clamp limiting rail voltage to 13 V during load dump or inductive kick events. Use Value: Absorbs up to 344 mA continuous reverse current (IZM) and withstands 1.0 W surges without degradation. |
| Voltage-Level Translation | Signal Conditioning Clamp |
Use Scenario: Biasing op-amp inputs or setting logic thresholds in mixed-signal interface circuits. IC Role / Device Role / Timing Role: Passive level-shifter establishing fixed 13 V reference against varying supply rails. Use Value: Delivers stable reference across –65°C to +150°C with <±0.01%/°C tempco near 13 V, per Figure 3. |
Use Scenario: Protecting ADC inputs or microcontroller GPIO pins from analog signal overrange. IC Role / Device Role / Timing Role: Bidirectional clamp (with series resistor) limiting input swing to ±13 V relative to ground. Use Value: Low 5 μA leakage at 9.9 V ensures minimal loading of high-impedance sources during normal operation. |
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 TR12 tape-and-reel packaging; bulk or ammo pack only | Lacks automated placement support; requires manual or vibratory feeder handling | Select 1N4743AP/TR12 for SMT line integration; choose 1N4743A for prototyping or low-volume hand assembly |
| MMBZ5242BS | SOT-23 surface-mount package; 13 V ±5%, 225 mW rating; 100 mA IZM | Lower power handling and different thermal path; unsuitable for >225 mW continuous dissipation | Use MMBZ5242BS where board space is constrained and power demand is ≤225 mW; retain 1N4743AP/TR12 for 1 W requirements |
Compared with 1N4743A and MMBZ5242BS, the 1N4743AP/TR12 uniquely combines 1 W power capability, DO-41 axial-leaded reliability, and EIA-296 tape-and-reel readiness-making it optimal for high-current shunt references and automated industrial power supply manufacturing.
Availability
1N4743AP/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage protection, and signal conditioning applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N4743AP/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, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N4743AP/TR12 belongs to Microsemi's legacy 1N47xxAP Zener diode family, engineered for precision voltage regulation in harsh-environment power systems where stability, thermal robustness, and JEDEC-standard compliance are critical.
FAQ
What is the Zener voltage tolerance of the 1N4743AP/TR12?
The 1N4743AP/TR12 has a nominal Zener voltage of 13 V with a ±5% tolerance, as confirmed by the "A" suffix in its part number per Microsemi's REV C datasheet. This tolerance applies at 19 mA test current and 25°C lead temperature, ensuring predictable regulation across production lots without requiring binning or calibration.
Does the 1N4743AP/TR12 require dry packing before reflow soldering?
No, the 1N4743AP/TR12 is moisture sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it does not require dry packing or baking prior to reflow. Its void-free UL94V-0 epoxy body and Level 1 rating eliminate moisture-related popcorning risk during standard 260°C/10 s soldering profiles.
What is the maximum continuous reverse current the 1N4743AP/TR12 can handle?
The 1N4743AP/TR12 supports a maximum regulator current (IZM) of 344 mA at ambient temperature of 50°C, as specified in Microsemi's electrical characteristics table. At higher temperatures, derating applies per Figure 1; at 25°C ambient, IZM remains 344 mA due to its 1 W power limit and thermal resistance profile.
How is polarity marked on the 1N4743AP/TR12?
The 1N4743AP/TR12 uses a single black band on the cathode end to indicate polarity, consistent with JEDEC DO-41 standards. During Zener regulation, the banded (cathode) lead must be held at a higher potential than the anode; forward conduction occurs when the anode is more positive, with VF ≤1.2 V at 200 mA.
Is the 1N4743AP/TR12 RoHS compliant?
Yes, the "e3" suffix in 1N4743AP/TR12 denotes RoHS-compliant matte-tin plating per Microsemi's documentation. The device meets EU RoHS Directive 2011/65/EU requirements with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE, and is fully compatible with lead-free reflow processes.
1N4743AP/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:
- ±5%
- 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)
1N4743AP/TR12 FAQ
1.How can I place an order for 1N4743AP/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4743AP/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 1N4743AP/TR12 reliable?
The price and inventory of 1N4743AP/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743AP/TR12 is usually 5 days.
3.What payment methods are accepted for 1N4743AP/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743AP/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4743AP/TR12?
1N4743AP/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4743AP/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 1N4743AP/TR12?
For technical support, including 1N4743AP/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743AP/TR12 requirements.
6.How does Aetrix verify that 1N4743AP/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N4743AP/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 1N4743AP/TR12 meets industry standards.
7.What is the process for return or replacement of 1N4743AP/TR12?
All 1N4743AP/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743AP/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 1N4743AP/TR12 part is unused and in its original packaging.
Return procedure for 1N4743AP/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4743AP/TR12 Tags
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