Equivalent & Substitute Parts: SMC Diode Solutions 1A2

Part Overview

The SMC Diode Solutions 1A2 is a general-purpose rectifier diode rated for 100 V DC reverse voltage and 1 A average rectified current in an R-1 axial through-hole package. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. The 1A2 employs standard recovery technology suitable for general rectification applications requiring moderate voltage and current ratings.

Substiute Parts

1A2

SMC Diode SolutionsIn Stock: 8391A2 Datasheet

Current PartRFQ

1N4002G

Taiwan Semiconductor CorporationIn Stock: 15061N4002G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 1A2 with the Taiwan Semiconductor Corporation 1N4002G is based on electrical parameter equivalence across all critical ratings. Both diodes share identical maximum reverse voltage (100 V), average rectified current (1 A), forward voltage drop (1 V @ 1 A), and reverse leakage current (5 µA @ 100 V). Both employ standard recovery technology with recovery time exceeding 500 ns at currents greater than 200 mA.

The primary substitution criteria are:

• Voltage - DC Reverse (Vr) (Max): 100 V (identical)
• Current - Average Rectified (Io): 1 A (identical)
• Voltage - Forward (Vf) (Max) @ If: 1 V @ 1 A (identical)
• Speed: Standard Recovery >500ns, > 200mA (Io) (identical)
• Current - Reverse Leakage @ Vr: 5 µA @ 100 V (identical)
• Mounting Type: Through Hole (identical)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (identical)

Both parts are through-hole axial diodes with compatible mechanical and thermal characteristics. The 1N4002G is classified as active product status with ROHS3 compliance, providing superior long-term availability compared to the obsolete 1A2.

Parameter Comparison

Engineering Selection Recommendations

The 1N4002G from Taiwan Semiconductor Corporation is a direct electrical equivalent to the obsolete 1A2. All critical electrical parameters—reverse voltage, forward current, forward voltage drop, recovery speed, and reverse leakage—are identical between the two devices. Both components maintain unlimited moisture sensitivity classification and identical export control designations.

The 1N4002G offers superior long-term procurement viability due to its active product status and ROHS3 compliance certification. The substitute part supports an extended operating temperature range (-55°C to 150°C versus -65°C to 125°C), providing additional thermal margin in applications approaching temperature extremes. The 1N4002G capacitance specification (10 pF) is lower than the 1A2 (15 pF), which is advantageous in high-frequency switching applications where parasitic capacitance must be minimized.

Both parts employ identical through-hole axial mounting technology. The R-1 and DO-204AL (DO-41) package designations refer to the same physical form factor, ensuring direct mechanical compatibility in existing printed circuit board layouts without design modification.

Frequently Asked Questions (FAQ)

Q: Can the 1N4002G directly replace the 1A2 in existing designs?

A: Yes. The 1N4002G is electrically and mechanically equivalent to the 1A2 across all specified parameters. Both devices are through-hole axial diodes with identical voltage, current, and thermal ratings. No circuit modifications are required for substitution.

Q: What is the difference between the R-1 and DO-204AL package designations?

A: R-1 and DO-204AL (DO-41) are equivalent package designations for the same axial through-hole diode form factor. Both refer to a cylindrical component with axial leads suitable for through-hole mounting on printed circuit boards. The physical dimensions and lead spacing are identical.

Q: Why is the 1N4002G capacitance lower than the 1A2?

A: The 1N4002G exhibits 10 pF capacitance compared to the 1A2's 15 pF, both measured at 4 V and 1 MHz. This lower capacitance value in the substitute part is beneficial for applications involving high-frequency switching or signal integrity requirements, as it reduces parasitic capacitive effects.

Q: Does the extended temperature range of the 1N4002G affect substitution suitability?

A: No. The 1N4002G operating temperature range (-55°C to 150°C) encompasses the 1A2 range (-65°C to 125°C). The substitute part provides equal or superior performance across all temperature conditions specified for the original component.

Q: Are there any compliance or regulatory differences between the two parts?

A: Both the 1A2 and 1N4002G share identical REACH status (REACH Unaffected) and export control classification (EAR99). The 1N4002G carries additional ROHS3 compliance certification, which may be required for certain applications or markets but does not restrict its use in applications originally designed for the 1A2.

Q: What is the significance of the product status difference?

A: The 1A2 is classified as obsolete, indicating discontinued manufacturing and limited availability. The 1N4002G is active product, ensuring reliable long-term procurement and supply chain continuity. For new designs or ongoing production, the 1N4002G is the recommended selection.

Q: Are the electrical characteristics identical between these two diodes?

A: Yes. The maximum reverse voltage (100 V), average rectified current (1 A), forward voltage drop (1 V @ 1 A), reverse leakage current (5 µA @ 100 V), and recovery speed (>500 ns, >200 mA) are identical. Both components employ standard recovery technology and are suitable for identical applications.