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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology 1N4743P/TR12

Name: 1N4743P/TR12
Brand: Microchip Technology
SKU: 1N4743P/TR12
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 1N4743P/TR12

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: 1N4743P/TR12.pdf

Description:: DIODE ZENER 13V 1W DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:5,533

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Product details

Overview

1N4743P/TR12 from Microsemi is a 13 V, 1 W silicon Zener diode in DO-41 plastic package with ±5% voltage tolerance, 19 mA test current, and 10 Ω dynamic impedance at I_ZT, used for precision voltage regulation in power supply reference and overvoltage protection circuits.

For engineers reviewing the 1N4743P/TR12 datasheet, 1N4743P/TR12 pinout, 1N4743P/TR12 application, or 1N4743P/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (45 °C/W junction-to-lead), surge current rating (344 mA), reverse leakage (<5 µA at 9.9 V), and RoHS-compliant e3 plating compatibility with automated assembly.

Technical Context

This axial-lead Zener operates in reverse breakdown to maintain stable 13 V output across 1.0–344 mA DC current range, with temperature coefficient near +3.5 mV/°C per Figure 3. Its 45 °C/W junction-to-lead thermal resistance enables reliable 1 W dissipation at 3/8″ lead length without forced cooling.

The device features a sharp knee at 0.25 mA test current (Z_ZK = 69 Ω), low forward voltage (≤1.2 V @ 200 mA), and moisture sensitivity level 1 per J-STD-020B-no dry pack required. Polarity is marked by cathode band; regulation requires banded end positive relative to anode.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	13 V ±5% at 19 mA - defines nominal regulation point with tight production control
Power Dissipation	1.0 W at T_L < 105 °C - supports continuous operation on standard PCB leads
Dynamic Impedance	10 Ω at I_ZT = 19 mA - ensures minimal output voltage shift under load transients
Reverse Leakage	<5 µA at V_R = 9.9 V - guarantees low quiescent current in standby regulation
Surge Current (I_SM)	344 mA (½-sine, 1/120 s) - withstands common AC line transient events
Thermal Resistance	45 °C/W junction-to-lead - enables thermal design with simple lead heatsinking
Operating Temp	−65 °C to +150 °C - suitable for industrial and automotive under-hood environments

Pinout & Package

DO-41 (DO-204AL) plastic axial-leaded package with void-free UL94V-0 epoxy body and tin-lead or RoHS-compliant matte-tin plating. Cathode identified by color band; anode is unmarked lead.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward conduction terminal / Zener cathode reference	Connected to circuit ground or lower-potential node during regulation
Cathode	Zener breakdown terminal / regulation output	Banded end; connected to regulated voltage rail; must be held positive relative to anode

Key Features

Feature	Design Value
JEDEC-registered 1N47xxA series	Industry-standard footprint and electrical behavior - ensures cross-manufacturer sourcing flexibility
Plastic P-suffix construction	Lower thermal resistance vs. glass-body G-suffix variants - improves power handling in compact layouts
RoHS-compliant e3 suffix option	Matte-tin plating qualified per MIL-STD-750 Method 2026 - supports lead-free reflow and long-term solderability
MIL-PRF-19500 screening availability	MQ/MX/MV/MSP prefixes enable JAN/JANTX/JANTXV/JANS versions - meets aerospace and defense reliability requirements
Level 1 moisture sensitivity	No dry pack or baking required before SMT - reduces manufacturing overhead and floor-life constraints

Applications

Power Supply Reference	Overvoltage Clamp
Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators. IC Role / Device Role / Timing Role: Zener reference element providing fixed 13 V threshold for error amplifier comparison. Use Value: Maintains ±5% output accuracy over −65 °C to +150 °C and 1–344 mA load range without external compensation.	Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback exceeding 13 V. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess energy to ground when voltage exceeds 13 V. Use Value: Limits transient voltage to safe levels using 344 mA surge rating and low Z_ZT to minimize clamping overshoot.
Voltage Monitor Threshold	Current Source Bias
Use Scenario: Triggering shutdown logic when battery or bus voltage drops below 13 V. IC Role / Device Role / Timing Role: Precision voltage comparator input reference in discrete monitoring circuits. Use Value: Enables accurate undervoltage detection with <5 µA leakage at 9.9 V, minimizing false triggers.	Use Scenario: Setting bias current for op-amp or transistor stages via constant-voltage drop. IC Role / Device Role / Timing Role: Stable 13 V reference enabling predictable current mirror or gain-setting resistor values. Use Value: Delivers consistent bias despite supply variation due to 10 Ω Z_ZT and sharp knee at 0.25 mA.

Power Supply Reference

Overvoltage Clamp

Use Scenario: Stabilizing feedback voltage in linear regulator ICs or discrete transistor-based regulators.

IC Role / Device Role / Timing Role: Zener reference element providing fixed 13 V threshold for error amplifier comparison.

Use Value: Maintains ±5% output accuracy over −65 °C to +150 °C and 1–344 mA load range without external compensation.

Use Scenario: Protecting microcontroller I/O pins from ESD or inductive kickback exceeding 13 V.

IC Role / Device Role / Timing Role: Shunt clamping device diverting excess energy to ground when voltage exceeds 13 V.

Use Value: Limits transient voltage to safe levels using 344 mA surge rating and low Z_ZT to minimize clamping overshoot.

Voltage Monitor Threshold

Current Source Bias

Use Scenario: Triggering shutdown logic when battery or bus voltage drops below 13 V.

IC Role / Device Role / Timing Role: Precision voltage comparator input reference in discrete monitoring circuits.

Use Value: Enables accurate undervoltage detection with <5 µA leakage at 9.9 V, minimizing false triggers.

Use Scenario: Setting bias current for op-amp or transistor stages via constant-voltage drop.

IC Role / Device Role / Timing Role: Stable 13 V reference enabling predictable current mirror or gain-setting resistor values.

Use Value: Delivers consistent bias despite supply variation due to 10 Ω Z_ZT and sharp knee at 0.25 mA.

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	Same electrical specs but unsuitable for high-speed pick-and-place	Select 1N4743P/TR12 for automated assembly; choose 1N4743A for manual prototyping or low-volume repair
MMBZ5242BS	SOT-23 surface-mount, 13 V ±5%, 225 mW - lower power, smaller footprint	Not interchangeable in through-hole designs; requires PCB redesign	Choose MMBZ5242BS only when board space is constrained and power demand ≤225 mW

Compared with 1N4743A and MMBZ5242BS, the 1N4743P/TR12 uniquely combines 1 W power handling, DO-41 mechanical robustness, tape-and-reel automation readiness, and full industrial temperature range - making it optimal for production-grade through-hole voltage regulation where reliability and manufacturability are prioritized.

Availability

1N4743P/TR12 is available at Aetrix Electronics and suitable for power supply reference, overvoltage clamp, and voltage monitor applications requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for 1N4743P/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 1N47xxAP Zener series was designed specifically for cost-effective, high-stability voltage regulation in commercial and ruggedized power systems - balancing JEDEC standardization with enhanced thermal performance in plastic packages.

FAQ

What is the Zener voltage tolerance for 1N4743P/TR12?

The 1N4743P/TR12 has a nominal Zener voltage of 13 V with ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This means the actual measured V_Z at 19 mA test current falls between 12.35 V and 13.65 V under standard test conditions (T_L = 25 °C, 90 s stabilization). The tolerance is guaranteed across the full operating temperature range.

Does 1N4743P/TR12 require baking before reflow soldering?

No, the 1N4743P/TR12 does not require baking prior to reflow soldering. It is rated Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it has unlimited floor life at ≤30 °C/60% RH and can be placed directly into reflow without dry-packaging or preconditioning - simplifying manufacturing flow and reducing process risk.

What is the maximum steady-state current for 1N4743P/TR12 at room temperature?

The maximum steady-state Zener current for 1N4743P/TR12 at 25 °C ambient is 76.9 mA, calculated from P = V × I → I = 1.0 W / 13 V. However, the datasheet specifies 344 mA as the peak surge current (½-sine, 1/120 s), while continuous operation above ~77 mA requires derating per Figure 1 to maintain safe junction temperature.

Is 1N4743P/TR12 compatible with lead-free reflow profiles?

Yes, the 1N4743P/TR12 is RoHS-compliant with "e3" suffix plating (annealed matte-tin), qualified per MIL-STD-750 Method 2026. It supports peak reflow temperatures up to 260 °C for 10 seconds, meeting JEDEC J-STD-020 requirements for lead-free assembly - no special thermal profiling adjustments are needed beyond standard Class 3 guidelines.

How does the thermal resistance of 1N4743P/TR12 compare to glass-body variants?

The 1N4743P/TR12 has a junction-to-lead thermal resistance of 45 °C/W, which is significantly lower than the glass-body 1N4743G variant (typically >60 °C/W). This 25% improvement allows higher continuous power dissipation at the same lead temperature, making the plastic P-suffix version preferable for thermally constrained through-hole applications.

1N4743P/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:: ±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)

1N4743P/TR12 FAQ

1.How can I place an order for 1N4743P/TR12 through Aetrix?

Please submit a Request for Quotation (RFQ) for 1N4743P/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 1N4743P/TR12 reliable?

The price and inventory of 1N4743P/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4743P/TR12 is usually 5 days.

3.What payment methods are accepted for 1N4743P/TR12?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4743P/TR12 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 1N4743P/TR12?

1N4743P/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 1N4743P/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 1N4743P/TR12?

For technical support, including 1N4743P/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4743P/TR12 requirements.

6.How does Aetrix verify that 1N4743P/TR12 is sourced from the original manufacturer or authorized distributors?

All 1N4743P/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 1N4743P/TR12 meets industry standards.

7.What is the process for return or replacement of 1N4743P/TR12?

All 1N4743P/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N4743P/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 1N4743P/TR12 part is unused and in its original packaging.

Return procedure for 1N4743P/TR12:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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