1N5819 Schottky Diode Equivalent & Substitute Parts

Part Overview

The 1N5819 is an active Schottky rectifier diode manufactured by Microchip Technology, designed for through-hole applications in the DO-41 package. This component operates at a maximum reverse voltage of 45 V with an average rectified current rating of 1 A, making it suitable for low-voltage power conversion and protection circuits. The device exhibits fast recovery characteristics with switching speeds of 500 ns or less at currents exceeding 200 mA.

Substitute parts are identified based on matching electrical performance within the specified parameter ranges, compatible mechanical packaging, and equivalent functional application in rectification circuits. Alternative components must maintain compatibility with existing circuit designs while meeting the same operational requirements.

Substiute Parts

1N5819

Microchip TechnologyIn Stock: 304361N5819 Datasheet

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1N5819

Microchip TechnologyIn Stock: 304361N5819 Datasheet

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SR104 A0G

Taiwan Semiconductor CorporationIn Stock: 10527SR104 A0G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1N5819 are qualified based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

• Technology classification: Schottky rectifier diode
• Reverse voltage rating: Equal to or greater than 45 V
• Average rectified current: Equal to or greater than 1 A
• Forward voltage drop: Within acceptable operating range for rectification applications
• Recovery speed: Fast recovery characteristics (≤ 500 ns at > 200 mA)
• Mounting configuration: Through-hole axial package (DO-41 or equivalent DO-204AL)
• Operating temperature range: Minimum -55°C to 125°C junction temperature

Substitution Logic: Parts meeting all primary criteria are classified as direct substitutes. The SR104 A0G from Taiwan Semiconductor Corporation qualifies as a substitute despite a 5 V reduction in reverse voltage rating (40 V versus 45 V) because it maintains all other critical parameters within acceptable ranges for standard rectification applications. The higher reverse leakage current (500 µA at 40 V versus 50 µA at 45 V) and slightly elevated forward voltage (550 mV versus 490 mV) represent acceptable trade-offs in applications where the 40 V rating provides sufficient margin above the circuit operating voltage.

Parameter Comparison

Engineering Selection Recommendations

1N5819 (Microchip Technology): The 1N5819 remains the primary component choice for applications requiring the specified 45 V reverse voltage rating and 50 µA reverse leakage current. This part maintains active product status with full REACH compliance and is available in high inventory quantities (30,400 pieces). The extended operating temperature range (-65°C to 125°C) supports applications in demanding thermal environments.

SR104 A0G (Taiwan Semiconductor Corporation): The SR104 A0G serves as a functional substitute in applications where the circuit operating voltage remains below 40 V and the higher reverse leakage current (500 µA) does not compromise circuit performance. This part is ROHS3 compliant with Moisture Sensitivity Level 1 (unlimited shelf life). The slightly elevated forward voltage drop (550 mV versus 490 mV) results in marginally increased power dissipation but remains acceptable for standard rectification circuits. The narrower operating temperature range (-55°C to 125°C) is suitable for most commercial and industrial applications.

Compliance and Regulatory Status: Both parts carry REACH Unaffected status and EAR99 ECCN classification. The SR104 A0G provides additional RoHS3 compliance certification. Selection between these parts should prioritize circuit voltage margin requirements and thermal operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the SR104 A0G replace the 1N5819 in all applications?

A: The SR104 A0G functions as a substitute in circuits where the maximum reverse voltage does not exceed 40 V. Applications requiring the full 45 V rating must use the 1N5819. Both parts share identical current ratings (1 A), fast recovery characteristics, and compatible through-hole packaging.

Q: What is the impact of the 60 mV forward voltage difference between these parts?

A: The SR104 A0G exhibits 550 mV forward voltage versus 490 mV for the 1N5819 at 1 A forward current. This 60 mV difference increases power dissipation proportionally to circuit current. In low-current applications (< 500 mA), this difference is negligible. In high-current applications approaching 1 A, thermal design calculations should account for the additional 60 mW dissipation.

Q: Are the DO-41 and DO-204AL packages physically identical?

A: The DO-41 and DO-204AL designations refer to the same through-hole axial package configuration. Both the 1N5819 and SR104 A0G use this package standard, ensuring mechanical compatibility in existing PCB layouts and through-hole assembly processes.

Q: What is the significance of the 10× difference in reverse leakage current?

A: The 1N5819 exhibits 50 µA reverse leakage at 45 V, while the SR104 A0G exhibits 500 µA at 40 V. In precision analog circuits or high-impedance applications, this difference may be significant. In standard power conversion and protection circuits, both leakage levels are acceptable. Circuit designers should evaluate leakage impact based on specific application requirements.

Q: Does the operating temperature range difference affect substitution?

A: The 1N5819 operates from -65°C to 125°C junction temperature, while the SR104 A0G operates from -55°C to 125°C. The SR104 A0G is suitable for commercial and industrial applications. Applications requiring operation below -55°C junction temperature must use the 1N5819.

Q: What inventory considerations apply to these parts?

A: The 1N5819 maintains higher inventory availability (30,400 pieces) compared to the SR104 A0G (10,505 pieces). Supply chain planning should account for these inventory levels when selecting between equivalent parts.