Equivalent & Substitute Parts for RS1A

Part Overview

The RS1A is a general-purpose rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This device features fast recovery characteristics with a reverse recovery time of 150 ns and operates across a junction temperature range of -55°C to 150°C.

The RS1A carries a "Not For New Designs" product status, indicating that onsemi has discontinued active development and support for this component. This status necessitates identification of equivalent and substitute parts that maintain functional compatibility while offering active product support and improved performance characteristics where applicable.

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
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the RS1A is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC (SMA) or compatible surface mount package
Mounting Type: Surface Mount
Technology: Standard (non-Schottky)
Voltage - Forward (Vf) (Max) @ If: 1.3 V or lower @ 1 A
Reverse Recovery Time (trr): 150 ns or faster
Current - Reverse Leakage @ Vr: 5 µA @ 50 V or lower

Substitution Categories:

Direct Equivalents (Same Package, Identical Electrical Performance): Parts that maintain the DO-214AC (SMA) package and match all critical electrical parameters. These parts are pin-compatible and require no circuit modifications.

Package Variants (Different Package, Equivalent Electrical Performance): Parts that meet all electrical criteria but use alternative surface mount packages such as DO-214BA (GF1). These require PCB layout verification for footprint compatibility.

Performance Upgrades (Enhanced Specifications): Parts that exceed the RS1A specifications in reverse recovery time, forward voltage, or operating temperature range while maintaining voltage and current ratings. These provide improved performance with no functional degradation.

Technology Variants (Schottky Diodes): Schottky technology diodes with identical voltage and current ratings but different forward voltage and leakage characteristics. These are listed for reference but represent a technology change requiring circuit validation.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	Temp Range [°C]
RS1A	onsemi	50	1	1.3	150	5 @ 50V	DO-214AC (SMA)	Not For New Designs	-55 to 150
RS1A-E3/61T	Vishay General Semiconductor	50	1	1.3	150	5 @ 50V	DO-214AC (SMA)	Active	-55 to 150
RS1A-13-F	Diodes Incorporated	50	1	1.3	150	5 @ 50V	DO-214AC (SMA)	Active	-65 to 150
CGRA4001-G	Comchip Technology	50	1	1.1	Standard Recovery	DO-214AC (SMA)	Active	-55 to 150
ES1A-E3/5AT	Vishay General Semiconductor	50	1	0.92	25	5 @ 50V	DO-214AC (SMA)	Active	-55 to 155
RGF1A-E3/67A	Vishay General Semiconductor	50	1	1.3	150	5 @ 50V	DO-214BA (GF1)	Active	-65 to 175
EGF1A-E3/67A	Vishay General Semiconductor	50	1	1.0	50	5 @ 50V	DO-214BA (GF1)	Active	-65 to 175
EGF1A-E3/5CA	Vishay General Semiconductor	50	1	1.0	50	5 @ 50V	DO-214BA (GF1)	Active	-65 to 175
MURA105T3G	onsemi	50	2	0.875	30	2 @ 50V	DO-214AC (SMA)	Active	-65 to 175
CMSH1-60M TR13 PBFREE	Central Semiconductor Corp	60	1	0.7	Fast Recovery	DO-214AC (SMA)	Active	-65 to 150

Engineering Selection Recommendations

Primary Equivalent (Direct Replacement):

RS1A-E3/61T (Vishay General Semiconductor) is the recommended direct equivalent. This part maintains identical electrical specifications (50 V, 1 A, 1.3 V forward voltage, 150 ns recovery time) and the same DO-214AC (SMA) package footprint. The part carries Active product status with full manufacturer support. Operating temperature range matches the original specification (-55°C to 150°C). This substitution requires no circuit modifications and provides pin-for-pin compatibility.

Secondary Equivalent (Active Alternative):

RS1A-13-F (Diodes Incorporated) provides equivalent electrical performance with identical voltage, current, and forward voltage specifications. This part operates across an extended lower temperature range (-65°C to 150°C), offering improved performance margin in cold environments. The DO-214AC (SMA) package ensures direct PCB compatibility. Active product status confirms ongoing manufacturer support.

Performance-Enhanced Alternatives (DO-214AC Package):

ES1A-E3/5AT (Vishay General Semiconductor) exceeds RS1A specifications with reduced forward voltage (0.92 V versus 1.3 V) and significantly faster reverse recovery time (25 ns versus 150 ns). This part operates across an extended temperature range (-55°C to 155°C). The DO-214AC (SMA) package provides direct footprint compatibility. Enhanced performance characteristics reduce power dissipation and switching losses in rectification circuits.

CGRA4001-G (Comchip Technology) provides equivalent voltage and current ratings with improved forward voltage (1.1 V versus 1.3 V). This part operates across the same temperature range as the original (-55°C to 150°C) and maintains DO-214AC (SMA) package compatibility. Active product status ensures manufacturer support.

Package Variant Alternatives (DO-214BA Package):

RGF1A-E3/67A and EGF1A-E3/67A (both Vishay General Semiconductor) maintain identical voltage and current ratings but use the DO-214BA (GF1) package. These parts require PCB footprint verification before implementation. Both parts offer extended operating temperature ranges (-65°C to 175°C) and Active product status. EGF1A-E3/67A provides superior performance with 1.0 V forward voltage and 50 ns reverse recovery time.

Higher Current Alternative:

MURA105T3G (onsemi) provides doubled current capacity (2 A versus 1 A) while maintaining 50 V voltage rating. This part is suitable for applications requiring increased current handling with the same voltage specification. Forward voltage is reduced to 0.875 V, and reverse recovery time is improved to 30 ns. Operating temperature range extends to -65°C to 175°C. Active product status confirms ongoing support.

Technology Variant (Schottky):

CMSH1-60M TR13 PBFREE (Central Semiconductor Corp) represents a Schottky technology alternative with 60 V rating and 1 A current capacity. Forward voltage is significantly reduced to 0.7 V, reducing power dissipation. Reverse leakage current is elevated to 500 µA at 60 V. This substitution requires circuit validation to confirm Schottky characteristics are compatible with the application.

Frequently Asked Questions (FAQ)

Q: Can RS1A-E3/61T be used as a direct replacement for RS1A without any circuit modifications?

A: Yes. RS1A-E3/61T maintains identical electrical specifications (50 V, 1 A, 1.3 V forward voltage, 150 ns reverse recovery time) and uses the same DO-214AC (SMA) package. No circuit modifications are required. The part is pin-compatible and functionally equivalent.

Q: What is the primary reason for finding a substitute for the RS1A?

A: The RS1A carries a "Not For New Designs" product status from onsemi, indicating discontinued active development. This status means the manufacturer no longer provides full technical support or guarantees long-term availability. Substitution with an Active-status part ensures ongoing manufacturer support and supply chain reliability.

Q: Are package variants like RGF1A-E3/67A and EGF1A-E3/67A suitable replacements?

A: Package variants using DO-214BA (GF1) instead of DO-214AC (SMA) require PCB footprint verification. While electrical specifications are equivalent or superior, the physical package dimensions differ. PCB layout must be reviewed to confirm the alternative package footprint is compatible with existing circuit board designs. These parts are electrically suitable but require mechanical validation.

Q: How does ES1A-E3/5AT improve upon the RS1A?

A: ES1A-E3/5AT provides three performance enhancements: reduced forward voltage (0.92 V versus 1.3 V), significantly faster reverse recovery time (25 ns versus 150 ns), and extended operating temperature range (-55°C to 155°C). These improvements reduce power dissipation and switching losses while maintaining identical voltage and current ratings. The DO-214AC (SMA) package ensures direct compatibility.

Q: What is the difference between standard rectifier diodes and Schottky diodes like CMSH1-60M TR13 PBFREE?

A: Schottky diodes feature lower forward voltage (0.7 V versus 1.3 V) and faster switching characteristics, reducing power dissipation. However, Schottky diodes exhibit significantly higher reverse leakage current (500 µA versus 5 µA at rated voltage). Schottky substitution requires circuit validation to confirm the application can tolerate increased leakage current without performance degradation.

Q: Can MURA105T3G be used in place of RS1A?

A: MURA105T3G provides doubled current capacity (2 A versus 1 A) while maintaining 50 V voltage rating. This part is suitable for applications requiring increased current handling. However, the higher current rating does not make it a direct replacement for 1 A applications. Use MURA105T3G only when the circuit design requires or benefits from the increased current capacity.

Q: What compliance certifications are maintained across all substitute parts?

A: All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, matching the original RS1A certifications. Moisture Sensitivity Level (MSL) is 1 (Unlimited) across all parts, indicating no moisture sensitivity concerns. All parts carry EAR99 ECCN classification and HTSUS code 8541.10.0080.

Q: Which substitute part offers the best overall performance improvement?

A: EGF1A-E3/67A provides the most comprehensive performance enhancement with 1.0 V forward voltage (versus 1.3 V), 50 ns reverse recovery time (versus 150 ns), and extended operating temperature range (-65°C to 175°C). However, this part uses the DO-214BA (GF1) package, requiring PCB footprint verification. For direct DO-214AC (SMA) package compatibility with performance improvement, ES1A-E3/5AT is the optimal choice.

Q: Are there inventory considerations when selecting a substitute?

A: Inventory levels vary across substitute parts. RS1A-E3/61T (5,232 pcs), RS1A-13-F (10,400 pcs), and EGF1A-E3/67A (30,300 pcs) maintain substantial stock levels. CMSH1-60M TR13 PBFREE (17,226 pcs) and ES1A-E3/5AT (20,100 pcs) also provide good availability. Inventory status should be verified with suppliers for long-term production requirements.

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