S1AH Equivalent & Substitute Parts

Part Overview

The S1AH is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as Active and carries automotive-grade qualification under AEC-Q101 standards.

The S1AH is currently in active production status with 641 pieces available in new original inventory. Substitute parts become necessary when the primary part number reaches end-of-life status, experiences supply constraints, or when alternative packaging formats are required for manufacturing flexibility while maintaining electrical and mechanical compatibility.

Substiute Parts

S1AH

Taiwan Semiconductor CorporationIn Stock: 724S1AH Datasheet

Current PartRFQ

S1A R3G

Taiwan Semiconductor CorporationIn Stock: 1046S1A R3G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the S1AH is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part S1A R3G maintains identical specifications for reverse voltage, forward current, forward voltage drop, reverse recovery time, reverse leakage current, and junction temperature range. Both components are housed in the DO-214AC (SMA) surface mount package and are manufactured by Taiwan Semiconductor Corporation.

The primary distinction between the S1AH and S1A R3G is packaging format: the S1AH is supplied in standard packaging, while the S1A R3G is supplied in Cut Tape (CT) format. Both parts carry identical electrical performance characteristics and automotive-grade AEC-Q101 qualification. The S1A R3G is listed as discontinued at DiGi Electronics, making the S1AH the preferred active alternative.

Key Parameters Determining Substitution:

• Voltage - DC Reverse (Vr) (Max): 50 V
• Current - Average Rectified (Io): 1 A
• Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
• Reverse Recovery Time (trr): 1.5 µs
• Current - Reverse Leakage @ Vr: 1 µA @ 50 V
• Package / Case: DO-214AC (SMA)
• Operating Temperature - Junction: -55°C ~ 175°C
• Mounting Type: Surface Mount
• Grade: Automotive
• Qualification: AEC-Q101

Parameter Comparison

Engineering Selection Recommendations

The S1AH is the recommended primary selection for new designs and production applications. It maintains active product status with established supply availability (641 pieces in stock) and carries full automotive-grade AEC-Q101 qualification, ensuring compliance with automotive reliability and quality standards.

The S1A R3G provides electrical and mechanical equivalence to the S1AH across all critical parameters. However, this part is listed as discontinued at DiGi Electronics, limiting its suitability for ongoing production requirements. The S1A R3G remains a valid substitute only for applications where existing inventory is available and where the Cut Tape packaging format aligns with manufacturing processes.

Both parts satisfy ROHS3 compliance and carry unlimited moisture sensitivity classification (MSL 1), indicating no special storage or handling requirements beyond standard component handling practices.

For applications requiring automotive-grade qualification and AEC-Q101 certification, the S1AH is the appropriate selection. The S1A R3G may be considered only when supply of the S1AH is constrained and when the discontinuation status does not conflict with long-term production planning.

Frequently Asked Questions (FAQ)

Q: Can the S1A R3G be used as a direct replacement for the S1AH in automotive applications?

A: The S1A R3G matches all electrical and mechanical parameters of the S1AH, including 50 V reverse voltage, 1 A average rectified current, and DO-214AC surface mount packaging. However, the S1A R3G is discontinued at DiGi Electronics, making it unsuitable for ongoing production. The S1AH is the active equivalent for automotive applications requiring AEC-Q101 qualification.

Q: What is the difference between the S1AH and S1A R3G packaging?

A: The S1AH is supplied in standard packaging format, while the S1A R3G is supplied in Cut Tape (CT) format. Both components are housed in the DO-214AC (SMA) package and are surface mount compatible. The packaging format difference relates to supply reel configuration and does not affect electrical performance or PCB mounting compatibility.

Q: Are both the S1AH and S1A R3G suitable for automotive applications?

A: The S1AH carries automotive-grade classification and AEC-Q101 qualification. The S1A R3G specifications do not explicitly list automotive grade or AEC-Q101 qualification in the provided data. For automotive applications requiring certified qualification, the S1AH is the appropriate selection.

Q: What are the critical electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by matching reverse voltage (50 V), average rectified current (1 A), forward voltage drop (1.1 V @ 1 A), reverse recovery time (1.5 µs), reverse leakage current (1 µA @ 50 V), and operating temperature range (-55°C to 175°C). Both the S1AH and S1A R3G meet these specifications identically.

Q: Can the S1AH be used in applications previously designed for the S1A R3G?

A: Yes. The S1AH provides full electrical and mechanical equivalence to the S1A R3G. Both components share identical electrical performance, junction temperature range, and DO-214AC surface mount package specifications. The S1AH is the active production alternative and is recommended for this application.

Q: What compliance certifications apply to the S1AH?

A: The S1AH is ROHS3 compliant, carries AEC-Q101 automotive qualification, and is REACH unaffected. The component is classified as MSL 1 (unlimited moisture sensitivity level), requiring no special moisture control during storage or handling.

Q: Is the S1AH suitable for high-temperature applications?

A: The S1AH operates across a junction temperature range of -55°C to 175°C, supporting both low-temperature and high-temperature applications within this specified range. This temperature range is identical to the S1A R3G.