FS1G-LTP Equivalent & Substitute Parts

Part Overview

The FS1G-LTP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This diode is classified as a fast recovery device with a reverse recovery time of 150 ns and is suitable for standard rectification applications requiring moderate switching speeds. The part is currently in Active product status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are identified based on matching or exceeding the electrical performance parameters while maintaining compatibility with the DO-214AC package footprint or acceptable alternative packages. Substitutes are necessary when the primary part becomes unavailable, when design requirements demand enhanced performance characteristics, or when automotive-grade qualification is required for specific applications.

Key Parameters

Parameter	FS1G-LTP Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5 @ 400 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Package / Case	DO-214AC, SMA	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-50°C ~ 150°C	-
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the FS1G-LTP are classified into two categories based on electrical and mechanical compatibility:

Direct Electrical Equivalents (DO-214AC Package): Parts that maintain identical or superior electrical specifications within the same DO-214AC (SMA) surface mount package. These substitutes share the same 400 V reverse voltage rating, 1 A average rectified current, fast recovery speed classification (≤ 500ns), and 150 ns reverse recovery time. Direct equivalents include RGF1G, RS1G-E3/5AT, RS1G-E3/61T, RS1GHE3_A/I, and US1GHE3_A/H. These parts are interchangeable at the circuit level and PCB footprint level.

Similar Electrical Performance (Alternative Packages): Parts that meet the core electrical requirements (400 V, 1 A) but utilize alternative surface mount packages (DO-214BA) or differ in recovery speed characteristics. GF1G-E3/5CA and GF1G-E3/67A are classified as similar parts due to their DO-214BA package, which requires different PCB footprint design. SA2G-E3/61T is classified as similar due to its 2 A current rating, which exceeds the 1 A requirement and represents an uprated alternative.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Package / Case: DO-214AC (SMA) for direct equivalents; DO-214BA acceptable for similar substitutes
Reverse Recovery Time (trr): Fast recovery (≤ 500ns) preferred for direct equivalents
Operating Temperature Range: Must encompass application requirements
RoHS and REACH Compliance: All substitutes maintain ROHS3 compliance and REACH unaffected status

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Tj Range [°C]	Product Status
FS1G-LTP	Micro Commercial Co	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-214AC	-50 ~ 150	Active
RGF1G	onsemi	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-214AC	-65 ~ 175	Not For New Designs
RS1G-E3/5AT	Vishay General Semiconductor - Diodes Division	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-214AC	-55 ~ 150	Active
RS1G-E3/61T	Vishay General Semiconductor - Diodes Division	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-214AC	-55 ~ 150	Active
RS1GHE3_A/I	Vishay General Semiconductor - Diodes Division	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-214AC	-55 ~ 150	Active
US1GHE3_A/H	Vishay General Semiconductor - Diodes Division	400	1	1.0 @ 1 A	50	10 @ 400 V	DO-214AC	-55 ~ 150	Active
GF1G-E3/5CA	Vishay General Semiconductor - Diodes Division	400	1	1.1 @ 1 A	2000	5 @ 400 V	DO-214BA	-65 ~ 175	Active
GF1G-E3/67A	Vishay General Semiconductor - Diodes Division	400	1	1.1 @ 1 A	2000	5 @ 400 V	DO-214BA	-65 ~ 175	Active
SA2G-E3/61T	Vishay General Semiconductor - Diodes Division	400	2	1.1 @ 2 A	1500	3 @ 400 V	DO-214AC	-55 ~ 150	Active

Engineering Selection Recommendations

For Direct Replacement (Same Footprint, Equivalent Performance):

RS1G-E3/61T and RS1G-E3/5AT are recommended as primary direct substitutes for the FS1G-LTP. Both parts are manufactured by Vishay General Semiconductor - Diodes Division, maintain Active product status, and provide identical electrical specifications (400 V, 1 A, 150 ns trr, 1.3 V forward voltage). These parts are suitable for immediate drop-in replacement without PCB redesign. RS1GHE3_A/I is an automotive-grade alternative (AEC-Q101 qualified) with identical electrical performance, appropriate for applications requiring automotive qualification.

For Enhanced Performance (Same Package, Improved Characteristics):

US1GHE3_A/H offers superior performance characteristics within the DO-214AC package, featuring reduced forward voltage (1.0 V @ 1 A versus 1.3 V) and faster reverse recovery time (50 ns versus 150 ns). This part is automotive-grade qualified (AEC-Q101) and suitable for applications where lower power dissipation and faster switching are beneficial. The part maintains Active product status and is available in high inventory quantities.

For Current Uprating (Same Package, Higher Current Capability):

SA2G-E3/61T provides a 2 A average rectified current rating within the same DO-214AC package, suitable for applications requiring higher current capacity while maintaining 400 V reverse voltage rating. This part is appropriate when design margins for current handling must be increased.

For Alternative Package Consideration (Different Footprint):

GF1G-E3/5CA and GF1G-E3/67A utilize the DO-214BA (GF1) package and are classified as SUPERECTIFIER® series devices. These parts are suitable only when PCB footprint redesign is acceptable. Both maintain Active product status and extended operating temperature range (-65°C ~ 175°C). The DO-214BA package requires different land pattern design compared to DO-214AC.

Parts Not Recommended for New Designs:

RGF1G (onsemi) is classified as "Not For New Designs" and should be avoided for new circuit development, although it remains electrically equivalent to the FS1G-LTP.

Frequently Asked Questions (FAQ)

Q: Can RS1G-E3/61T be used as a direct replacement for FS1G-LTP without PCB modification?

A: Yes. RS1G-E3/61T is a direct electrical and mechanical equivalent. Both parts use the DO-214AC (SMA) package with identical footprint dimensions, and electrical specifications are identical (400 V, 1 A, 150 ns reverse recovery time, 1.3 V forward voltage). No PCB redesign is required.

Q: What is the difference between DO-214AC and DO-214BA packages?

A: DO-214AC (SMA) and DO-214BA (GF1) are different surface mount package outlines with different land pattern dimensions. Parts in DO-214BA package (GF1G-E3/5CA, GF1G-E3/67A) require PCB footprint redesign and cannot be used on boards designed for DO-214AC components. Mechanical compatibility is not interchangeable.

Q: Why does US1GHE3_A/H have a lower forward voltage (1.0 V) compared to FS1G-LTP (1.3 V)?

A: US1GHE3_A/H represents an enhanced diode design with improved semiconductor material and junction characteristics, resulting in lower forward voltage drop at the same 1 A current rating. This is a performance improvement that reduces power dissipation in the diode during operation.

Q: Is SA2G-E3/61T suitable as a substitute if my application only requires 1 A?

A: SA2G-E3/61T is electrically compatible and can be used in applications requiring 1 A, as it is rated for 2 A maximum. The part provides additional current margin and is suitable for designs where future current requirements may increase. However, the forward voltage specification is 1.1 V @ 2 A, which differs from the FS1G-LTP specification of 1.3 V @ 1 A.

Q: What does "Not For New Designs" mean for RGF1G?

A: "Not For New Designs" indicates that while RGF1G remains available and functionally equivalent, the manufacturer (onsemi) recommends against using this part in new circuit development. This classification typically indicates the part is in end-of-life phase or has been superseded by improved alternatives. Existing designs using RGF1G may continue operation, but new designs should select from Active status alternatives.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the FS1G-LTP.

Q: What is the significance of AEC-Q101 qualification on RS1GHE3_A/I and US1GHE3_A/H?

A: AEC-Q101 is the automotive electronics council qualification standard for discrete semiconductors. Parts bearing this qualification have undergone rigorous testing for automotive applications and are suitable for use in automotive circuits where reliability and quality standards are mandated. Non-automotive applications do not require this qualification.

Q: Can I use GF1G-E3/5CA in place of FS1G-LTP if I redesign the PCB?

A: GF1G-E3/5CA is electrically compatible (400 V, 1 A) but uses the DO-214BA package, requiring PCB footprint redesign. Additionally, GF1G-E3/5CA has a reverse recovery time of 2 µs (2000 ns) compared to FS1G-LTP's 150 ns, indicating slower switching speed. This part is suitable only if the application does not require fast recovery characteristics and PCB redesign is acceptable.

Q: What is the operating temperature range difference between FS1G-LTP and its substitutes?

A: FS1G-LTP operates from -50°C to 150°C. Most Vishay substitutes (RS1G-E3/5AT, RS1G-E3/61T, RS1GHE3_A/I, US1GHE3_A/H, SA2G-E3/61T) operate from -55°C to 150°C, providing slightly lower minimum temperature capability. GF1G variants operate from -65°C to 175°C, providing extended temperature range. Application requirements determine whether extended range is necessary.

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