FS1B-LTP Equivalent & Substitute Parts

Part Overview

The FS1B-LTP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 100 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This part is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary for design continuity, inventory management, and sourcing alternatives when the original part becomes unavailable or when transitioning to active product lines.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1 A
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 100 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-50 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the FS1B-LTP are grouped into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Electrical and Package Specifications): Direct substitutes maintain the same voltage rating (100 V), current rating (1 A), reverse recovery time (150 ns), forward voltage (1.3 V @ 1 A), and DO-214AC (SMA) package. These parts are pin-compatible and functionally equivalent for applications requiring the FS1B-LTP specifications. Direct substitutes include CFRA102-G, RS1B-E3/5AT, RS1B-E3/61T, and RS1B-M3/5AT.

Similar Substitutes (Different Package or Performance Characteristics): Similar substitutes meet the core electrical requirements (100 V, 1 A) but differ in package type or performance characteristics. EGF1B-E3/5CA and EGF1B-E3/67A use the DO-214BA (GF1) package instead of DO-214AC, feature lower forward voltage (1 V @ 1 A) and faster recovery time (50 ns), and operate across a wider temperature range (-65°C to 175°C). GF1B-E3/5CA and GF1B-E3/67A also use DO-214BA packaging but employ standard recovery technology (2 µs trr) with slightly higher forward voltage (1.1 V @ 1 A).

Non-Equivalent Part (Different Current Rating): RS1B-M3/61T is rated for 50 V maximum reverse voltage and is not suitable as a substitute for the FS1B-LTP, which requires 100 V operation.

Non-Equivalent Part (Different Current Rating): MURA210T3G is rated for 2 A average rectified current and is not suitable as a substitute for the FS1B-LTP, which requires 1 A operation.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Package	Product Status	Tj Range [°C]
FS1B-LTP	Micro Commercial Co	100	1	1.3 @ 1A	150	DO-214AC (SMA)	Not For New Designs	-50 to 150
CFRA102-G	Comchip Technology	100	1	1.3 @ 1A	150	DO-214AC (SMA)	Active	-40 to 150
RS1B-E3/5AT	Vishay General Semiconductor - Diodes Division	100	1	1.3 @ 1A	150	DO-214AC (SMA)	Active	-55 to 150
RS1B-E3/61T	Vishay General Semiconductor - Diodes Division	100	1	1.3 @ 1A	150	DO-214AC (SMA)	Active	-55 to 150
RS1B-M3/5AT	Vishay General Semiconductor - Diodes Division	100	1	1.3 @ 1A	150	DO-214AC (SMA)	Active	-55 to 150
EGF1B-E3/5CA	Vishay General Semiconductor - Diodes Division	100	1	1.0 @ 1A	50	DO-214BA (GF1)	Active	-65 to 175
EGF1B-E3/67A	Vishay General Semiconductor - Diodes Division	100	1	1.0 @ 1A	50	DO-214BA (GF1)	Not For New Designs	-65 to 175
GF1B-E3/5CA	Vishay General Semiconductor - Diodes Division	100	1	1.1 @ 1A	2000	DO-214BA (GF1)	Active	-65 to 175
GF1B-E3/67A	Vishay General Semiconductor - Diodes Division	100	1	1.1 @ 1A	2000	DO-214BA (GF1)	Not For New Designs	-65 to 175

Engineering Selection Recommendations

For Direct Replacement (Same Package and Performance): RS1B-E3/5AT, RS1B-E3/61T, and RS1B-M3/5AT are active products from Vishay General Semiconductor - Diodes Division that provide identical electrical specifications and DO-214AC (SMA) packaging. These parts are suitable for direct substitution in existing designs. RS1B-E3/5AT and RS1B-E3/61T offer extended lower temperature operation (-55°C minimum) compared to the FS1B-LTP (-50°C minimum). CFRA102-G from Comchip Technology is also electrically equivalent but operates to a maximum junction temperature of 150°C (same as FS1B-LTP) with a minimum of -40°C.

For Enhanced Performance (Lower Forward Voltage and Faster Recovery): EGF1B-E3/5CA is an active product offering superior performance characteristics: lower forward voltage (1.0 V @ 1 A versus 1.3 V), faster reverse recovery time (50 ns versus 150 ns), and wider operating temperature range (-65°C to 175°C). This part requires a different package footprint (DO-214BA instead of DO-214AC) and is suitable for new designs where PCB layout can accommodate the package change.

For Standard Recovery Applications: GF1B-E3/5CA is an active product with standard recovery characteristics (2 µs trr) and DO-214BA packaging. This part is appropriate for applications where fast recovery is not required and where the different package footprint is acceptable.

Parts to Avoid for New Designs: EGF1B-E3/67A and GF1B-E3/67A are marked "Not For New Designs" and should not be selected for new product development, despite their technical compatibility.

All recommended substitute parts are ROHS3 compliant, have MSL rating of 1 (Unlimited), and are unaffected by REACH regulations, matching the compliance profile of the FS1B-LTP.

Frequently Asked Questions (FAQ)

Q: Can RS1B-E3/5AT be used as a direct replacement for FS1B-LTP? A: Yes. RS1B-E3/5AT is electrically and mechanically equivalent to FS1B-LTP. Both are rated for 100 V, 1 A, feature 150 ns reverse recovery time, 1.3 V forward voltage at 1 A, and use the DO-214AC (SMA) package. RS1B-E3/5AT is an active product from Vishay, making it a suitable long-term alternative.

Q: What is the difference between DO-214AC and DO-214BA packages? A: DO-214AC (SMA) and DO-214BA (GF1) are different surface mount diode packages with different footprints and pin configurations. Parts using DO-214BA cannot be directly substituted into PCB layouts designed for DO-214AC without redesigning the footprint. EGF1B-E3/5CA and GF1B-E3/5CA use DO-214BA packaging and require PCB layout changes.

Q: Why does EGF1B-E3/5CA have lower forward voltage than FS1B-LTP? A: EGF1B-E3/5CA is part of Vishay's SUPERECTIFIER® series, which uses advanced semiconductor technology to achieve lower forward voltage (1.0 V versus 1.3 V) and faster recovery time (50 ns versus 150 ns). These performance improvements come from different die design and manufacturing processes.

Q: Is CFRA102-G suitable for applications requiring operation below -40°C? A: No. CFRA102-G has a minimum junction temperature of -40°C, whereas FS1B-LTP operates to -50°C. For applications requiring operation below -40°C, use RS1B-E3/5AT, RS1B-E3/61T, or RS1B-M3/5AT, which all operate to -55°C minimum.

Q: Can MURA210T3G replace FS1B-LTP? A: No. MURA210T3G is rated for 2 A average rectified current, whereas FS1B-LTP is rated for 1 A. Using a higher-current-rated diode in a 1 A application is not a valid substitution and may result in circuit malfunction or reliability issues.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All direct and similar substitute parts listed are ROHS3 compliant and have MSL rating of 1 (Unlimited), matching the compliance profile of FS1B-LTP.

Q: What is the inventory status of substitute parts? A: RS1B-E3/5AT has the highest inventory (15,300 pcs), followed by EGF1B-E3/5CA (15,300 pcs) and EGF1B-E3/67A (30,200 pcs). CFRA102-G has 795 pcs available. Inventory levels should be verified with suppliers for current availability.

Q: Can GF1B-E3/5CA be used in high-speed switching applications? A: No. GF1B-E3/5CA has a reverse recovery time of 2 µs (standard recovery), making it unsuitable for high-speed switching applications. For fast switching, use EGF1B-E3/5CA (50 ns trr) or the original FS1B-LTP specification (150 ns trr).

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