Microchip Technology 1N4756E3/TR13

Overview

1N4756E3/TR13 from Microsemi is a 1.0 W, 47 V ±5% axial-lead silicon Zener diode in DO-41 (DO-204AL) plastic package, rated for -65°C to +150°C operation, with 5.5 mA test current, 80 Ω dynamic impedance at I_ZT, and 1500 mA maximum regulator current - used for precision voltage reference and overvoltage protection in power supply feedback loops.

For engineers reviewing the 1N4756E3/TR13 datasheet, 1N4756E3/TR13 pinout, 1N4756E3/TR13 application, or 1N4756E3/TR13 equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (45°C/W junction-to-lead), surge current rating (1500 mA), RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR13).

Technical Context

This device operates in reverse-bias breakdown mode to maintain stable 47 V regulation across a wide current range (5.5 mA to 1500 mA), with sharp knee characteristics verified by dual-point Zener impedance measurement per JEDEC standards. Its 45°C/W junction-to-lead thermal resistance enables reliable 1.0 W dissipation at 3/8" lead length, while moisture sensitivity level 1 eliminates dry-pack requirements.

The 1N4756E3/TR13 features cathode band polarity marking, UL94V-0 void-free epoxy encapsulation, and solderability validated per MIL-STD-750 Method 2026. It delivers stable regulation over -65°C to +150°C ambient and exhibits a typical temperature coefficient near +10 mV/°C at 47 V, as confirmed in Microsemi's Figure 3.

Key Specifications

Pinout & Package

DO-41 (DO-204AL) axial-lead plastic package: cylindrical body with cathode band marking; leads tinned for solderability; weight 0.7 g; UL94V-0 compliant epoxy; moisture sensitivity level 1 (no dry pack required).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 1N4756A and MMBZ5256BS, the 1N4756E3/TR13 uniquely combines full 1.0 W power capability, RoHS compliance, tape-and-reel automation support, and industry-standard DO-41 mechanical compatibility - making it optimal for industrial power supplies requiring long-term component continuity and mixed-technology assembly.

Availability

1N4756E3/TR13 is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure equipment, and factory automation systems requiring stable component supply and long-lifecycle support.

Supply support for 1N4756E3/TR13 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 1N47xxA Zener series was designed for general-purpose voltage regulation and reference applications demanding JEDEC-standard performance, thermal robustness, and long-term stability in harsh environments.

FAQ

What is the Zener voltage tolerance for 1N4756E3/TR13?

The 1N4756E3/TR13 has a Zener voltage tolerance of ±5%, as indicated by the "A" suffix in its JEDEC designation. This means its measured breakdown voltage falls between 44.65 V and 49.35 V at 5.5 mA test current and 25°C lead temperature. The tolerance is guaranteed across the full operating temperature range (-65°C to +150°C), and the device is fully compliant with JEDEC registration requirements for the 1N47xxA family.

Does 1N4756E3/TR13 support lead-free soldering processes?

Yes, the 1N4756E3/TR13 supports lead-free soldering with its RoHS-compliant "e3" suffix, indicating annealed matte-tin plating qualified per MIL-STD-750 Method 2026. It withstands peak solder temperatures of 260°C for 10 seconds, matching standard lead-free reflow profiles. The DO-41 package's thermal mass and 45°C/W junction-to-lead resistance also help prevent thermal damage during repeated reflow cycles.

What is the maximum surge current rating for 1N4756E3/TR13?

The 1N4756E3/TR13 has a maximum surge current (I_SM) rating of 1500 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient. This rating applies specifically to transient overvoltage clamping events, such as ESD or line surges, and is distinct from its steady-state 1.0 W power dissipation limit. Derating is required for repeated surges or elevated ambient temperatures.

How does the thermal resistance of 1N4756E3/TR13 compare to glass-body variants?

The 1N4756E3/TR13 has a junction-to-lead thermal resistance of 45°C/W, which is significantly lower than glass-body equivalents like 1N4756G (typically ~60–70°C/W). This 25–40% improvement results from the plastic DO-41 package's superior thermal coupling to the leads, enabling higher sustained power dissipation at the same lead temperature - especially critical in compact power supply designs with limited heatsinking.

Is tape-and-reel packaging mandatory for automated assembly of 1N4756E3/TR13?

No, tape-and-reel packaging is optional but standardized for the "TR13" variant; the base part 1N4756E3 is available in bulk or ammo pack. However, TR13 format complies with EIA-296 specifications and enables direct use in pick-and-place machines - even for axial-lead devices - via specialized feeders. This eliminates manual loading and improves placement repeatability in high-volume manufacturing of hybrid through-hole/SMT boards.