FS1A-LTP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The FS1A-LTP is a general purpose rectifier diode manufactured by Micro Commercial Co, 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 This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Equivalent and substitute parts are necessary for applications requiring continued sourcing, design flexibility, or performance optimization within the specified electrical and mechanical parameters.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the FS1A-LTP is determined by electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Package / Case: DO-214AC (SMA) or DO-214BA (GF1) are mechanically compatible surface mount packages
Reverse Recovery Time (trr): Fast recovery characteristics (≤ 500ns) preferred for equivalent performance
Operating Temperature Range: Must support the application's thermal requirements
Forward Voltage (Vf): Variations within 1.0 to 1.3 V @ 1 A are acceptable for general purpose rectification

Substitute Parts Identified:

EGF1A-E3/67A (Vishay General Semiconductor - Diodes Division): Fast recovery diode, DO-214BA package, enhanced performance characteristics
GF1A-E3/67A (Vishay General Semiconductor - Diodes Division): Standard recovery diode, DO-214BA package, alternative speed classification
RS1A_R1_00001 (Panjit International Inc.): Fast recovery diode, DO-214AC (SMA) package, identical package footprint

Parameter Comparison

Parameter	FS1A-LTP (Main)	EGF1A-E3/67A	GF1A-E3/67A	RS1A_R1_00001
Manufacturer	Micro Commercial Co	Vishay General Semiconductor	Vishay General Semiconductor	Panjit International Inc.
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.0 V @ 1 A	1.1 V @ 1 A	1.3 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Standard Recovery > 500ns	Fast Recovery ≤ 500ns
Reverse Recovery Time (trr)	150 ns	50 ns	2 µs	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	1 µA @ 50 V
Capacitance @ Vr, F	50 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	12 pF @ 4V, 1MHz
Package / Case	DO-214AC (SMA)	DO-214BA (GF1)	DO-214BA (GF1)	DO-214AC (SMA)
Operating Temperature - Junction	-50 to 150°C	-65 to 175°C	-65 to 175°C	-55 to 150°C
Product Status	Not For New Designs	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Package Compatibility (DO-214AC / SMA Footprint):

The RS1A_R1_00001 from Panjit International Inc. provides direct mechanical and electrical substitution for the FS1A-LTP. Both components utilize the DO-214AC (SMA) package, eliminating PCB layout modifications. Electrical parameters are equivalent: 50 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, and 150 ns reverse recovery time. The RS1A_R1_00001 offers improved reverse leakage characteristics (1 µA versus 5 µA) and lower capacitance (12 pF versus 50 pF), with active product status ensuring continued availability.

For Enhanced Performance with Package Change (DO-214BA / GF1 Footprint):

The EGF1A-E3/67A from Vishay General Semiconductor - Diodes Division offers superior fast recovery characteristics (50 ns reverse recovery time versus 150 ns) and lower forward voltage (1.0 V versus 1.3 V at 1 A). This substitute requires PCB layout modification due to the DO-214BA (GF1) package change. The extended operating temperature range (-65 to 175°C versus -50 to 150°C) provides thermal margin for demanding applications. Active product status and ROHS3 compliance ensure long-term sourcing stability.

For Standard Recovery Applications with Package Change:

The GF1A-E3/67A from Vishay General Semiconductor - Diodes Division is suitable for applications where fast recovery characteristics are not required. This part features standard recovery speed (2 µs reverse recovery time) and 1.1 V forward voltage at 1 A. The DO-214BA (GF1) package requires PCB modification. This option is appropriate for low-frequency rectification where switching speed is not a performance constraint.

Compliance and Sourcing Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the FS1A-LTP regulatory profile. The FS1A-LTP's Not For New Designs status necessitates transition to an active product. EGF1A-E3/67A and RS1A_R1_00001 are recommended for new designs due to active product status and superior availability (30,300 and 2,823 units respectively in stock).

Frequently Asked Questions (FAQ)

Q: Can the RS1A_R1_00001 be used as a direct replacement for the FS1A-LTP without PCB modification?

A: Yes. Both components use the DO-214AC (SMA) surface mount package with identical footprints. No PCB layout changes are required. Electrical parameters are equivalent within general purpose rectification specifications.

Q: What is the primary difference between the EGF1A-E3/67A and the FS1A-LTP?

A: The EGF1A-E3/67A features significantly faster reverse recovery time (50 ns versus 150 ns) and lower forward voltage (1.0 V versus 1.3 V at 1 A). However, it uses the DO-214BA (GF1) package instead of DO-214AC (SMA), requiring PCB modification. The extended operating temperature range (-65 to 175°C) provides additional thermal capability.

Q: Why does the GF1A-E3/67A have a longer reverse recovery time than the FS1A-LTP?

A: The GF1A-E3/67A is classified as standard recovery (2 µs) rather than fast recovery (150 ns). This classification reflects the diode's switching characteristics. Standard recovery diodes are suitable for lower-frequency applications where switching speed is not a critical performance parameter.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The FS1A-LTP and all identified substitute parts (EGF1A-E3/67A, GF1A-E3/67A, RS1A_R1_00001) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the impact of the capacitance difference between the FS1A-LTP (50 pF) and substitute parts (12-15 pF)?

A: Lower capacitance in substitute parts reduces parasitic effects in high-frequency circuits and improves switching performance. For general purpose rectification at standard frequencies, this difference has minimal impact on circuit operation.

Q: Can the FS1A-LTP be used in new designs?

A: No. The FS1A-LTP is classified as Not For New Designs. New designs should utilize active products such as the RS1A_R1_00001, EGF1A-E3/67A, or GF1A-E3/67A to ensure long-term availability and manufacturer support.

Q: What is the difference between the DO-214AC (SMA) and DO-214BA (GF1) packages?

A: Both are surface mount packages for general purpose rectifier diodes. DO-214AC (SMA) and DO-214BA (GF1) have different physical dimensions and PCB footprints. Substitution between these packages requires PCB layout modification and verification of mechanical clearance.

Q: Which substitute part offers the best overall performance?

A: The EGF1A-E3/67A provides the best performance characteristics with 50 ns reverse recovery time, 1.0 V forward voltage, and extended operating temperature range. Selection depends on application requirements: if package compatibility is critical, use RS1A_R1_00001; if performance optimization is the priority, use EGF1A-E3/67A.

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