Microchip Technology 1N4741APE3/TR12

Overview

1N4741APE3/TR12 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 5 μA reverse leakage at 8.4 V, used for precision voltage regulation in power supply feedback loops and reference circuits.

For engineers reviewing the 1N4741APE3/TR12 datasheet, 1N4741APE3/TR12 pinout, 1N4741APE3/TR12 application, or 1N4741APE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (45 °C/W junction-to-lead), surge current rating (414 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging per EIA-296.

Technical Context

This axial-leaded Zener operates in reverse breakdown to maintain stable 11 V output across 0.25–414 mA DC current range, with temperature coefficient near zero (±0.05 %/°C typical) due to its 11 V nominal voltage point on the V_Z vs. temp curve. It delivers regulation over -65 °C to +150 °C ambient, with junction-to-lead thermal resistance of 45 °C/W at 10 mm lead length.

Designed for through-hole mounting on FR4 PCBs with 1 oz copper, it achieves 105 °C/W junction-to-ambient thermal resistance using 4 mm² copper pads and 1 mm × 25 mm trace; forward voltage is ≤1.2 V at 200 mA, and cathode polarity is marked by a band.

Key Specifications

Pinout & Package

Package: DO-41 (JEDEC DO-204AL), plastic molded thermosetting epoxy body (UL94V-0), axial-leaded, cathode indicated by band. Tin-lead or RoHS-compliant matte-tin plating, 0.7 g weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4741A-T and MMSZ4701T1G, the 1N4741APE3/TR12 uniquely combines full 1 W power capability, RoHS-compliant matte-tin terminals, and EIA-296 tape-and-reel packaging - making it optimal for high-reliability through-hole production requiring regulatory compliance and automated handling.

Availability

1N4741APE3/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor references, overvoltage clamps, and microcontroller reset circuits requiring stable component supply with RoHS compliance and automated assembly support.

Supply support for 1N4741APE3/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 1N47xxAP Zener series was engineered for ruggedized voltage regulation in mission-critical power and sensing applications, emphasizing thermal stability, moisture resilience, and JEDEC-standard interoperability.

FAQ

What is the Zener voltage tolerance of the 1N4741APE3/TR12?

The 1N4741APE3/TR12 has a Zener voltage tolerance of ±5%, confirmed by the "A" suffix in its part number per Microsemi's documentation. This means its nominal 11 V breakdown voltage falls between 10.45 V and 11.55 V at 23 mA test current and 25 °C lead temperature. The tolerance is guaranteed across the full operating temperature range of -65 °C to +150 °C, supporting stable regulation in demanding environments. The 1N4741APE3/TR12 meets JEDEC registration requirements for this tolerance band.

Does the 1N4741APE3/TR12 support automated assembly?

Yes, the 1N4741APE3/TR12 supports automated assembly via its "TR12" suffix, indicating EIA-296 standard tape-and-reel packaging. It is supplied on 12-inch reels compatible with industry-standard pick-and-place equipment. The axial-leaded DO-41 package is designed for through-hole insertion, and its RoHS-compliant matte-tin plating ensures reliable solderability under lead-free reflow profiles. The 1N4741APE3/TR12 eliminates manual handling steps in high-volume production lines.

What is the maximum surge current rating for the 1N4741APE3/TR12?

The 1N4741APE3/TR12 has a maximum surge current (I_SM) rating of 414 mA, measured using a ½-sine wave pulse of 1/120 second duration at 25 °C ambient. This rating reflects its ability to absorb short-duration transients without parametric shift or failure. The surge capability is enabled by its 1 W power rating and low thermal resistance (45 °C/W junction-to-lead). Engineers use this value to size input filters and select upstream fusing for the 1N4741APE3/TR12 in clamp applications.

How does the thermal performance of the 1N4741APE3/TR12 compare between lead-mount and PCB-mount configurations?

The 1N4741APE3/TR12 exhibits 45 °C/W junction-to-lead thermal resistance at 10 mm lead length, but degrades to 105 °C/W junction-to-ambient when mounted on FR4 with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm trace. This 2.3× increase highlights the importance of lead length control in thermal design. For sustained 1 W operation, lead-mounted use is preferred; PCB mounting requires derating above 45 °C ambient. The 1N4741APE3/TR12 datasheet provides derating curves to guide safe operating area selection.

Is the 1N4741APE3/TR12 suitable for automotive under-hood applications?

Yes, the 1N4741APE3/TR12 is suitable for automotive under-hood applications due to its -65 °C to +150 °C operating and storage temperature range, moisture sensitivity Level 1 (no dry pack required), and nonsensitivity to ESD per MIL-STD-750 Method 1020. Its DO-41 plastic package meets UL94V-0 flammability rating, and the 1N4741APE3/TR12 maintains stable 11 V regulation across thermal cycling. These attributes align with AEC-Q200 stress test expectations for passive components in engine compartment environments.