Microchip Technology 1N4759P/TR8

Overview

1N4759P/TR8 from Microsemi is a 1.0 W plastic-encapsulated Zener diode with nominal Zener voltage of 62 V, ±5% tolerance (A-suffix), 4.0 mA test current (IZT), 125 Ω dynamic impedance at IZT, and maximum reverse current of 5 μA at 47.1 V. It operates from –65 °C to +150 °C and is used for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation.

For engineers reviewing the 1N4759P/TR8 datasheet, 1N4759P/TR8 pinout, 1N4759P/TR8 application, or 1N4759P/TR8 equivalent, key selection factors include its DO-41 axial package, 62 V regulation point, thermal resistance of 45 °C/W (junction-to-lead), RoHS-compliant "e3" plating option, and tape-and-reel packaging (TR8 suffix).

Technical Context

This Zener diode functions in reverse-biased breakdown mode to maintain stable output voltage across varying load and line conditions. Its 62 V nominal Zener voltage is specified at 4.0 mA test current with 125 Ω dynamic impedance, ensuring predictable regulation slope and low voltage drift under moderate current changes.

Designed for through-hole mounting, it features a cathode band marking, tin-lead or matte-tin plating per MIL-STD-750, and moisture sensitivity level 1 (no dry pack required). Thermal performance is characterized at 3/8″ lead length (45 °C/W junction-to-lead) and on FR4 board (105 °C/W junction-to-ambient).

Key Specifications

Pinout & Package

Package: DO-41 (DO-204AL), axial-leaded plastic encapsulated case with cathode band marking. 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 1N4759A and MMSZ4708T1G, the 1N4759P/TR8 uniquely combines 1.0 W power handling, DO-41 axial form factor, and EIA-296 tape-and-reel compatibility-making it optimal for high-reliability through-hole production where thermal margin and assembly automation are critical.

Availability

1N4759P/TR8 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage reference designs requiring stable component supply and full traceability.

Supply support for 1N4759P/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 developed to deliver JEDEC-standard Zener regulation with enhanced thermal performance and RoHS compliance-targeting power conversion, protection, and precision reference applications in harsh environments.

FAQ

What is the Zener voltage tolerance of the 1N4759P/TR8?

The 1N4759P/TR8 has a nominal Zener voltage of 62 V with ±5% tolerance, indicated by the "A" suffix in its part number per JEDEC standard. This means the actual measured V_Z falls between 58.9 V and 65.1 V at 4.0 mA test current and 25 °C lead temperature. The tolerance is guaranteed across the full operating temperature range of –65 °C to +150 °C, and the 1N4759P/TR8 datasheet confirms this specification applies to all units in the production lot.

Does the 1N4759P/TR8 support lead-free soldering processes?

Yes, the 1N4759P/TR8 is offered with RoHS-compliant annealed matte-tin plating (e3 suffix), qualified for lead-free reflow and wave soldering up to 260 °C for 10 seconds. Its DO-41 package and termination meet IPC/JEDEC J-STD-020B moisture sensitivity level 1, eliminating dry-pack requirements. This makes the 1N4759P/TR8 fully compatible with modern eco-conscious manufacturing flows without compromising thermal or electrical performance.

What is the maximum surge current rating for the 1N4759P/TR8?

The 1N4759P/TR8 has a maximum non-repetitive surge current (I_SM) of 2000 mA, measured using a ½ sine-wave pulse of 1/120 second duration at 25 °C ambient. This rating applies when the device is operated within its Zener breakdown region and is critical for transient suppression applications such as input-stage clamping. The 1N4759P/TR8 datasheet specifies this value under Note 3 and confirms it is valid for single-event surges-not repetitive duty cycles.

How does the thermal resistance of the 1N4759P/TR8 affect PCB layout?

The 1N4759P/TR8 has a junction-to-lead thermal resistance of 45 °C/W when measured at 3/8″ (10 mm) lead length from the body-meaning PCB layout must provide adequate copper area and lead length to dissipate 1.0 W without exceeding 150 °C junction temperature. For FR4 boards, its junction-to-ambient resistance is 105 °C/W with defined 4 mm² copper pads and 1 mm track width; deviating from these dimensions requires recalculating allowable power using the 1N4759P/TR8 derating curve in Figure 1 of the datasheet.

Is the 1N4759P/TR8 suitable for use as a voltage reference in precision analog circuits?

The 1N4759P/TR8 provides stable 62 V regulation but is not optimized for sub-0.1% precision analog references due to its ±5% initial tolerance and temperature coefficient typical of standard Zeners. However, it is widely used as a coarse reference in power supply feedback, clamp, and trim circuits where absolute accuracy is secondary to robustness and cost. For high-precision applications, designers typically pair the 1N4759P/TR8 with trimming resistors or use it to bias higher-accuracy devices like TL431; its 125 Ω dynamic impedance supports predictable interaction in such configurations.