FS1D-LTP Equivalent & Substitute Parts

Part Overview

The FS1D-LTP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 200 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This component is classified as "Not For New Designs," indicating its obsolescence status. The fast recovery characteristic (≤500 ns) with 150 ns reverse recovery time makes it suitable for switching applications requiring rapid diode turn-off. Due to its discontinued design status, equivalent and substitute parts from active product lines are necessary for ongoing production and maintenance applications.

Substiute Parts

FS1D-LTP

Micro Commercial CoIn Stock: 5477FS1D-LTP Datasheet

Current PartRFQ

FS1DE-TP

Micro Commercial CoIn Stock: 918FS1DE-TP Datasheet

Parametric EquivalentRFQ

EGF1D-E3/5CA

Vishay General Semiconductor - Diodes DivisionIn Stock: 15349EGF1D-E3/5CA Datasheet

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EGF1D-E3/67A

Vishay General Semiconductor - Diodes DivisionIn Stock: 30174EGF1D-E3/67A Datasheet

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GF1D-E3/67A

Vishay General Semiconductor - Diodes DivisionIn Stock: 9688GF1D-E3/67A Datasheet

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GF1D/1754

Vishay General Semiconductor - Diodes DivisionIn Stock: 1026GF1D/1754 Datasheet

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RGF1D-E3/5CA

Vishay General Semiconductor - Diodes DivisionIn Stock: 15215RGF1D-E3/5CA Datasheet

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RS1DHE3_A/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 7752RS1DHE3_A/H Datasheet

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RS1DHE3_A/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 7271RS1DHE3_A/I Datasheet

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RS1G

Taiwan Semiconductor CorporationIn Stock: 25431RS1G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FS1D-LTP is determined by matching the following critical electrical and mechanical parameters:

Primary Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 200 V minimum
• Current - Average Rectified (Io): 1 A minimum
• Speed Classification: Fast Recovery ≤500ns, >200mA (Io)
• Reverse Recovery Time (trr): 150 ns maximum
• Mounting Type: Surface Mount
• Package compatibility: DO-214AC (SMA) or equivalent footprint

Secondary Considerations:

• Forward voltage (Vf) at rated current
• Reverse leakage current
• Operating temperature range
• RoHS and regulatory compliance

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalents (Identical Electrical Specifications): Parts matching all primary electrical parameters with identical or superior performance characteristics. These include FS1DE-TP (Micro Commercial Co), RS1DHE3_A/H, and RS1DHE3_A/I (Vishay General Semiconductor).

Category 2 - Similar Performance Alternatives (Enhanced Specifications): Parts exceeding the FS1D-LTP specifications in reverse recovery time or forward voltage performance, suitable for direct substitution with improved circuit performance. These include EGF1D-E3/5CA, EGF1D-E3/67A, RGF1D-E3/5CA (Vishay General Semiconductor).

Category 3 - Package Variant Alternatives: Parts with identical electrical specifications but different package designations (DO-214BA instead of DO-214AC), requiring PCB layout verification. These include GF1D-E3/67A and GF1D/1754 (Vishay General Semiconductor).

Non-Equivalent Part: RS1G (Taiwan Semiconductor Corporation) operates at 400 V reverse voltage and is not a direct substitute for 200 V applications.

Parameter Comparison

Engineering Selection Recommendations

Recommended Primary Substitutes (Identical Package and Specifications):

RS1DHE3_A/H and RS1DHE3_A/I are the preferred substitutes for the FS1D-LTP. Both parts maintain the DO-214AC (SMA) package footprint, matching electrical specifications (200 V, 1 A, 1.3 V forward voltage, 150 ns recovery time), and are ROHS3 compliant. Both carry Active product status and AEC-Q101 automotive qualification, providing long-term availability and supply chain stability. The operating temperature range (-55°C to 150°C) is compatible with the FS1D-LTP application envelope.

Secondary Substitutes (Enhanced Performance, Package Variant):

EGF1D-E3/5CA and EGF1D-E3/67A (Vishay SUPERECTIFIER® series) offer superior reverse recovery time (50 ns versus 150 ns) and lower forward voltage (1.0 V versus 1.3 V), resulting in reduced power dissipation and faster switching. These parts use the DO-214BA (GF1) package, requiring PCB layout verification for footprint compatibility. Extended operating temperature range (-65°C to 175°C) provides additional thermal margin. Both are ROHS3 compliant and Active status.

RGF1D-E3/5CA maintains identical electrical specifications to the FS1D-LTP (200 V, 1 A, 1.3 V, 150 ns) with DO-214BA package. This part is ROHS3 compliant and Active status, suitable for applications where package change is acceptable.

Alternative with Performance Trade-off:

GF1D-E3/67A and GF1D/1754 provide 200 V, 1 A operation but with standard recovery characteristics (2 µs recovery time) and slightly higher forward voltage (1.1 V). These are suitable only for non-switching applications or where slower recovery is acceptable. GF1D/1754 is RoHS non-compliant and should be avoided for new designs.

Non-Recommended:

RS1G (400 V rating) is not suitable for 200 V applications and introduces unnecessary voltage margin, increasing component cost without functional benefit.

Frequently Asked Questions (FAQ)

Q: Can RS1DHE3_A/H directly replace FS1D-LTP without PCB modification?

A: Yes. RS1DHE3_A/H maintains identical DO-214AC (SMA) package geometry, electrical ratings (200 V, 1 A), and switching characteristics (150 ns recovery time). No PCB layout changes are required.

Q: What is the difference between EGF1D-E3/5CA and RGF1D-E3/5CA?

A: Both are 200 V, 1 A fast recovery diodes with identical electrical specifications. EGF1D-E3/5CA features superior reverse recovery time (50 ns) and lower forward voltage (1.0 V), while RGF1D-E3/5CA matches the FS1D-LTP specifications exactly (150 ns, 1.3 V). Both use DO-214BA package and require footprint verification.

Q: Why is RS1G listed as a substitute if it has 400 V rating?

A: RS1G is not a functional substitute for 200 V applications. It was included in the original FS1D-LTP substitute list but does not meet the primary voltage requirement. It should not be selected for this application.

Q: Can GF1D-E3/67A be used in high-speed switching circuits?

A: No. GF1D-E3/67A has standard recovery characteristics (2 µs) compared to the FS1D-LTP fast recovery (150 ns). This slower recovery time makes it unsuitable for switching applications requiring rapid diode turn-off. Use EGF1D-E3/67A or RGF1D-E3/5CA for switching applications.

Q: What is the impact of switching from DO-214AC to DO-214BA package?

A: DO-214AC (SMA) and DO-214BA (GF1) are different surface mount packages with different footprints. PCB layout must be verified and potentially redesigned. Electrical performance is unaffected. Consult package datasheets for dimensional specifications before PCB modification.

Q: Are all recommended substitutes RoHS3 compliant?

A: All recommended substitutes (RS1DHE3_A/H, RS1DHE3_A/I, EGF1D-E3/5CA, EGF1D-E3/67A, RGF1D-E3/5CA, GF1D-E3/67A) are ROHS3 compliant. GF1D/1754 is RoHS non-compliant and should not be used for new designs or applications requiring RoHS certification.

Q: What is the temperature operating range difference between FS1D-LTP and substitute parts?

A: FS1D-LTP operates -50°C to 150°C. RS1DHE3_A/H and RS1DHE3_A/I operate -55°C to 150°C (slightly lower minimum). Vishay SUPERECTIFIER® parts (EGF1D, RGF1D) operate -65°C to 175°C (extended range). Verify application temperature requirements before selection.

Q: Can FS1DE-TP be used as a substitute?

A: FS1DE-TP is electrically identical to FS1D-LTP but is classified as Obsolete. While it maintains the same specifications, its discontinued status makes it unsuitable for long-term production. Active status substitutes (RS1DHE3_A/H, EGF1D-E3/67A, RGF1D-E3/5CA) are preferred for supply chain reliability.