S1A-LTP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The S1A-LTP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 50V DC reverse voltage and 1A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent substitute parts is necessary for ongoing maintenance, repair, and legacy system support where original components are no longer readily available or where design flexibility permits component substitution within specified electrical and mechanical parameters.

Substiute Parts

S1A-LTP

Micro Commercial CoIn Stock: 1107S1A-LTP Datasheet

Current PartRFQ

S1A_R1_00001

Panjit International Inc.In Stock: 1835S1A_R1_00001 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the S1A-LTP are identified based on electrical and mechanical parameter equivalence. The primary substitution criteria are:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 50 V
• Current - Average Rectified (Io): 1 A
• Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
• Speed Classification: Standard Recovery >500ns, > 200mA (Io)
• Operating Temperature - Junction: -55°C to 150°C

Mechanical Parameters (Must Match):

• Package / Case: DO-214AA, SMB
• Mounting Type: Surface Mount

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Parts meeting all these criteria are classified as parametric equivalents and direct substitutes. Secondary parameters such as reverse leakage current and capacitance may vary within acceptable ranges without affecting functional compatibility in standard applications.

Parameter Comparison

Engineering Selection Recommendations

The S1A_R1_00001 manufactured by Panjit International Inc. is a direct parametric equivalent to the S1A-LTP. Both components meet identical electrical specifications for reverse voltage, forward current, forward voltage drop, and recovery characteristics. Both are packaged in DO-214AA (SMB) surface mount format and comply with ROHS3 and MSL 1 requirements.

The primary distinction is product status: the S1A-LTP is classified as "Not For New Designs," while the S1A_R1_00001 maintains "Active" status. For applications requiring ongoing component availability and manufacturer support, the S1A_R1_00001 is the appropriate selection. The S1A_R1_00001 exhibits lower reverse leakage current (1 µA versus 5 µA at 50V), which represents improved performance characteristics while maintaining full electrical compatibility.

Both components are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification, indicating no special moisture handling requirements during storage or assembly.

Frequently Asked Questions (FAQ)

Q: Can the S1A_R1_00001 be used as a direct replacement for the S1A-LTP in existing designs?

A: Yes. The S1A_R1_00001 meets all electrical and mechanical specifications of the S1A-LTP. Both components are rated for 50V reverse voltage, 1A average rectified current, and are packaged in identical DO-214AA (SMB) surface mount format. No circuit modifications are required.

Q: What is the significance of the S1A-LTP being marked "Not For New Designs"?

A: This designation indicates the component has reached end-of-life status and is no longer recommended for new product development. Existing inventory may remain available, but manufacturer support and long-term availability are not guaranteed. The S1A_R1_00001 is the recommended substitute for ongoing applications.

Q: Are there differences in reverse leakage current between these parts?

A: Yes. The S1A-LTP specifies 5 µA reverse leakage at 50V, while the S1A_R1_00001 specifies 1 µA at the same conditions. Lower reverse leakage represents improved performance and is compatible with all applications designed for the S1A-LTP.

Q: Do both parts require the same PCB footprint and assembly process?

A: Yes. Both components use the DO-214AA (SMB) package with identical mechanical dimensions and pin configuration. PCB footprints, solder reflow profiles, and assembly procedures are interchangeable.

Q: Are there any compliance or certification differences?

A: No. Both the S1A-LTP and S1A_R1_00001 are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity classification. Both are REACH Unaffected and classified under ECCN EAR99.

Q: What is the operating temperature range for both components?

A: Both components operate across a junction temperature range of -55°C to 150°C, providing identical thermal performance specifications.

Q: Can these parts be used interchangeably in high-frequency switching applications?

A: Both components are classified as Standard Recovery diodes with recovery time specifications exceeding 500ns at currents greater than 200mA. They are suitable for standard rectification applications. For high-frequency switching applications requiring fast recovery times, alternative fast recovery or ultrafast recovery diode types should be evaluated.