Microchip Technology 1N4741PE3/TR8

Overview

1N4741PE3/TR8 from Microsemi is a 1 W, 11 V ±5% Zener diode in DO-41 plastic package, rated for 23 mA test current, 8 Ω dynamic impedance at I_ZT, and 700 mA maximum regulator current at T_A = 50°C. It provides stable voltage reference in power supply feedback loops, overvoltage clamping, and precision biasing circuits.

For engineers reviewing the 1N4741PE3/TR8 datasheet, 1N4741PE3/TR8 pinout, 1N4741PE3/TR8 application, or 1N4741PE3/TR8 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (45 °C/W junction-to-lead), RoHS-compliant matte-tin plating, tape-and-reel packaging (TR8), and -65°C to +150°C operating temperature range.

Technical Context

This axial-lead silicon Zener diode operates in reverse breakdown to maintain a stable 11 V reference across a wide current range (1 mA to 700 mA). Its 8 Ω dynamic impedance at 23 mA ensures low output variation under load transients.

Designed for through-hole mounting on FR4 PCBs with 1 oz copper, it delivers 1.0 W dissipation at lead temperature <105°C (3/8" from body) or ambient <45°C, with thermal resistance of 105 °C/W junction-to-ambient under defined board conditions.

Key Specifications

Pinout & Package

DO-41 (DO-204AL) plastic axial-leaded package with cathode band marking; terminals are anode and cathode; no internal circuitry beyond single-junction Zener structure.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Compared with 1N4741A and BZX55C11, the 1N4741PE3/TR8 offers full RoHS compliance, 1 W power capability, and lower dynamic impedance-making it optimal for robust, high-current voltage regulation where lead-free manufacturing and thermal margin are required.

Availability

1N4741PE3/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, fixed-voltage bias networks, and temperature-stable reference sources requiring stable component supply and full RoHS compliance.

Supply support for 1N4741PE3/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, RF, and discrete components for aerospace, defense, and industrial markets.

The 1N47xxAP series was engineered for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal robustness, moisture immunity, and long-term parametric stability under extreme environmental stress.

FAQ

What is the Zener voltage tolerance for 1N4741PE3/TR8?

The 1N4741PE3/TR8 has a nominal Zener voltage of 11 V with a tolerance of ±5%, as confirmed by Microsemi's REV C datasheet. This tolerance applies at 23 mA test current and 25°C lead temperature. The "A" suffix in the base part number (1N4741A) explicitly denotes the 5% tolerance grade, and the "P" and "e3" suffixes retain this specification while indicating plastic packaging and RoHS compliance.

Does 1N4741PE3/TR8 support lead-free soldering processes?

Yes, the 1N4741PE3/TR8 features RoHS-compliant annealed matte-tin plating, qualified for lead-free reflow soldering at 260°C for 10 seconds per MIL-STD-750 Method 2026. Its moisture sensitivity level is IPC/JEDEC J-STD-020B Level 1, eliminating dry-pack requirements and enabling direct placement into standard SMT lines without baking.

What is the maximum continuous power dissipation for 1N4741PE3/TR8?

The 1N4741PE3/TR8 is rated for 1.0 W steady-state power dissipation when lead temperature (T_L) is maintained below 105°C at 3/8" (10 mm) from the body. On a standard FR4 PCB (1 oz Cu, 4 mm² pads), its derated power drops to 1.0 W only if ambient temperature remains below 45°C-per the thermal resistance of 105 °C/W junction-to-ambient under those conditions.

How is polarity marked on the 1N4741PE3/TR8 package?

The 1N4741PE3/TR8 uses a cathode band (a single painted stripe) on the plastic DO-41 body to identify the cathode terminal. During Zener regulation, the banded end must be held at a more positive potential than the unbanded (anode) end. This marking complies with JEDEC DO-204AL standards and is visible under standard visual inspection.

What does the "TR8" suffix indicate in 1N4741PE3/TR8?

"TR8" denotes tape-and-reel packaging per EIA-296 standard, with 8 mm tape width and component orientation optimized for automated pick-and-place equipment. This format enables high-throughput SMT assembly and is distinct from bulk or ammo-pack options. The "e3" suffix confirms RoHS compliance, while "P" specifies plastic (DO-41) construction-both retained in the TR8 variant.