Diodes Incorporated 1N5391-T

Overview

1N5391-T from Diodes Incorporated is a 1.5A general-purpose silicon rectifier diode in DO-15 package, rated for 50V peak repetitive reverse voltage (V_RRM), 1.1V forward voltage drop at 1.5A, and 50A non-repetitive surge current. It serves as AC-to-DC input stage rectifier in offline power supplies for consumer adapters and industrial control power modules.

For engineers reviewing the 1N5391-T datasheet, 1N5391-T pinout, 1N5391-T application, or 1N5391-T equivalent, key selection criteria include V_RRM, I_O, V_F, thermal resistance (R_θJA = 55°C/W), and DO-15 mechanical compatibility with PCB layout constraints.

Technical Context

This axial-lead rectifier operates in single-phase, half-wave configurations with resistive or inductive loads at 60Hz. Its fast switching behavior minimizes conduction loss, while low reverse leakage (5.0μA @ 25°C) supports stable DC bus hold-up in unregulated supplies.

The device uses planar passivated junction construction with molded plastic case (UL 94V-0), cathode band polarity marking, and tin-plated leads compliant with MIL-STD-202 solderability requirements.

Key Specifications

Pinout & Package

DO-15 axial-leaded plastic package (5.50–7.62 mm body length, 2.60–3.60 mm diameter), cathode identified by band-marked end. Leads are tin-plated, solderable per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar general-purpose rectifier applications.

Compared with 1N4001-T, 1N5391-T delivers 50% higher average current and equal surge robustness; versus 1N5391G, it differs only in lead finish and marking-no electrical or thermal performance variation.

Availability

1N5391-T is available at Aetrix Electronics and suitable for AC-DC wall adapters, industrial control power supplies, LED driver auxiliary supplies, and appliance mainboard bias rails requiring stable component supply and long-term manufacturing continuity.

Supply support for 1N5391-T 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and Europe.

The 1N539x series belongs to Diodes' general-purpose rectifier product line, engineered for cost-sensitive, high-volume AC-DC conversion in consumer, industrial, and appliance power systems.

FAQ

Is 1N5391-T compatible with automated SMT assembly?

No. The 1N5391-T uses axial-leaded DO-15 packaging designed for through-hole mounting. It lacks surface-mount terminations or tape-and-reel carrier features required for pick-and-place machines. For SMT alternatives, consider SMB or SMC packaged rectifiers like SB150 or MUR160.

What is the maximum operating temperature for continuous 1.5A load?

At 1.5A DC load, the junction temperature reaches 150°C at 70°C ambient due to R_θJA = 55°C/W and P_D ≈ 1.65W. Therefore, continuous 1.5A operation is rated only up to 70°C ambient. Derating curves show usable current drops to 1.0A at 100°C ambient.

Does 1N5391-T meet UL recognition requirements?

Yes. The DO-15 package carries UL Flammability Classification 94V-0, and the device complies with UL 1557 for rectifier diodes. Full UL file number and certification status are documented in Diodes Incorporated's Component Recognition Service Report E152248.

Can 1N5391-T replace 1N4007 in high-voltage applications?

No. The 1N5391-T has V_RRM = 50V, while the 1N4007 is rated for 1000V. Substituting it in 400V+ circuits risks immediate avalanche breakdown and catastrophic failure. Use 1N5397-T (600V) or 1N5399-T (1000V) for equivalent voltage-class replacement.