Microchip Technology 1N4741CP/TR8

Overview

1N4741CP/TR8 from Microsemi is a 1 W, 11 V ±5% axial-lead silicon Zener diode in DO-41 (DO-204AL) plastic package, rated for 23 mA test current, 8 Ω dynamic impedance at I_ZT, and 700 μA reverse leakage at 8.4 V. It regulates voltage across industrial power supplies, reference circuits, and overvoltage protection stages.

For engineers reviewing the 1N4741CP/TR8 datasheet, 1N4741CP/TR8 pinout, 1N4741CP/TR8 application, or 1N4741CP/TR8 equivalent, key selection factors include its 11 V nominal Zener voltage, 1 W steady-state dissipation at T_L < 105 °C, JEDEC-compliant DO-41 mechanical form, and RoHS-compliant "e3" plating with tape-and-reel packaging (TR8).

Technical Context

This discrete Zener operates in reverse breakdown to maintain stable voltage under varying load and temperature. Its 11 V regulation point exhibits a positive temperature coefficient (~+3.5 mV/°C per Figure 3), requiring thermal design consideration above 50 °C ambient. The device delivers 700 μA max reverse current at 8.4 V (90% of V_Z) and supports surge currents up to 414 mA (½-sine, 1/120 s).

Designed for through-hole mounting with flexible axial leads, it features void-free UL94V-0 epoxy encapsulation, tin-lead or matte-tin plating per MIL-STD-750 Method 2026, and moisture sensitivity level 1 (no dry pack required). Polarity is marked by cathode band; regulation requires cathode-positive bias.

Key Specifications

Pinout & Package

Package: DO-41 (JEDEC DO-204AL), axial-lead plastic case with cathode band marking. Dimensions per Microsemi Page 3: body diameter 2.0–2.7 mm, length 4.0–5.3 mm, lead diameter 0.4–0.6 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4741A and MMSZ4701T1G, the 1N4741CP/TR8 uniquely combines 1 W dissipation, DO-41 mechanical robustness, tape-and-reel automation support, and JEDEC-standardized test conditions-making it optimal for industrial power supply and protection designs requiring proven reliability and manufacturability.

Availability

1N4741CP/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, sensor signal conditioning, and overvoltage protection circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for 1N4741CP/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 specifically for general-purpose voltage regulation in harsh-environment power systems, emphasizing JEDEC standardization, thermal performance, and screening flexibility across military and commercial grades.

FAQ

What is the Zener voltage tolerance of the 1N4741CP/TR8?

The 1N4741CP/TR8 has a nominal Zener voltage of 11 V with a ±5% tolerance, as indicated by the "A" suffix in its JEDEC designation. This means the actual measured V_Z at 23 mA test current falls between 10.45 V and 11.55 V under standard test conditions (T_L = 25 °C, 90 s stabilization). The "P" suffix confirms plastic DO-41 packaging, and "TR8" denotes EIA-296 tape-and-reel format.

Can the 1N4741CP/TR8 be used in surface-mount designs?

No, the 1N4741CP/TR8 uses a DO-41 axial-lead package and is designed exclusively for through-hole mounting. For surface-mount equivalents, consider Microsemi's SMAJ4741A or ON Semiconductor's MMSZ4701T1G-both rated at 11 V but differing in power rating (1 W vs. 0.5 W) and package (SMA vs. SOD-123). The 1N4741CP/TR8 itself cannot be soldered to SMT pads without mechanical adaptation.

What is the maximum reverse leakage current for the 1N4741CP/TR8?

The 1N4741CP/TR8 specifies a maximum reverse leakage current (I_R) of 700 μA at a test voltage (V_R) of 8.4 V-90% of its nominal 11 V Zener voltage. This value is measured at T_A = 25 °C and confirms the device's sharp knee characteristic and suitability for low-quiescent-current reference applications where standby loss must be minimized.

Does the 1N4741CP/TR8 require dry-pack moisture protection before reflow?

No, the 1N4741CP/TR8 is classified as Moisture Sensitivity Level 1 per IPC/JEDEC J-STD-020B, meaning it may be stored indefinitely at ambient conditions without desiccant or dry packing. This eliminates pre-reflow baking steps, simplifying manufacturing flow and reducing risk of popcorn cracking-especially important for high-volume industrial assembly lines using the 1N4741CP/TR8.

What is the thermal resistance specification for the 1N4741CP/TR8?

The 1N4741CP/TR8 has a junction-to-lead thermal resistance (R_θJL) of 45 °C/W when measured at 3/8″ (10 mm) lead length from the body, per Microsemi's datasheet. This value reflects efficient heat conduction through the axial leads and supports 1 W continuous operation at lead temperatures below 105 °C. When mounted on FR4 with specified copper pads, junction-to-ambient resistance rises to 105 °C/W.