RS1A-M3/5AT Equivalent & Substitute Parts

Part Overview

The RS1A-M3/5AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode operates at 50 V DC reverse voltage with 1 A average rectified current in a DO-214AC (SMA) package. The part is classified as Active and complies with ROHS3 standards. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative sourcing is required.

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 @ 1	V @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Capacitance @ Vr, F	10	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the RS1A-M3/5AT is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 1 A minimum
Package / Case: DO-214AC (SMA) surface mount
Mounting Type: Surface Mount
Forward voltage (Vf) compatibility within acceptable circuit operating margins

Parametric Equivalent Parts maintain identical electrical specifications and package configuration, differing only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel). These parts are direct functional replacements.

Upgrade Parts exceed the voltage or temperature specifications of the main part while maintaining the same current rating and package type. These parts provide enhanced performance margins for applications requiring higher reverse voltage capability or extended temperature operation.

Manufacturer Recommended Parts meet the core electrical specifications with variations in forward voltage, recovery time, or capacitance characteristics. These parts are qualified alternatives from different manufacturers and are suitable for direct substitution in most applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [ns]	Package	Product Status	Inventory [Pcs]
RS1A-M3/5AT	Vishay	50	1	1.3	150	DO-214AC (SMA)	Active	807
RS1A-E3/5AT	Vishay	50	1	1.3	150	DO-214AC (SMA)	Active	7690
RS1A-E3/61T	Vishay	50	1	1.3	150	DO-214AC (SMA)	Active	5232
RGF1B	Fairchild Semiconductor	100	1	1.3	150	DO-214AC (SMA)	Active	39800
RS1A-13-F	Diodes Incorporated	50	1	1.3	150	DO-214AC (SMA)	Active	10400
CGRA4001-G	Comchip Technology	50	1	1.1	—	DO-214AC (SMA)	Active	10226
EGF1A	Fairchild Semiconductor	50	1	1.0	50	DO-214AC (SMA)	Active	39900
ES1A	YAGEO	50	—	0.95	—	DO-214AC	Active	80200
ES1A-13-F	Diodes Incorporated	50	1	0.92	25	DO-214AC (SMA)	Active	70300
ES1A-LTP	Micro Commercial Co	50	1	0.95	35	DO-214AC (SMA)	Not For New Designs	5415
GF1A	onsemi	50	1	1.0	2000	DO-214AC (SMA)	Not For New Designs	35200

Engineering Selection Recommendations

Parametric Equivalent Selection (Vishay Parts): RS1A-E3/5AT and RS1A-E3/61T are parametric equivalents of RS1A-M3/5AT with identical electrical specifications. These parts differ only in packaging format (Cut Tape & Digi-Reel versus Tape & Reel). Both are Active status products and maintain full ROHS3 compliance. Selection between these parts is determined by packaging and supply chain requirements rather than electrical performance.

Upgrade Selection (RGF1B): RGF1B from Fairchild Semiconductor provides a 100 V reverse voltage rating compared to the 50 V specification of RS1A-M3/5AT. This part maintains the 1 A current rating and DO-214AC package configuration. RGF1B is suitable for applications requiring enhanced voltage margin or where circuit design permits higher voltage-rated components. Extended operating temperature range (-65°C to 175°C) provides additional thermal margin.

Cross-Manufacturer Alternatives (Active Status): RS1A-13-F (Diodes Incorporated), CGRA4001-G (Comchip Technology), EGF1A (Fairchild Semiconductor), ES1A-13-F (Diodes Incorporated), and ES1A (YAGEO) meet the core electrical specifications of 50 V reverse voltage and 1 A current rating in DO-214AC surface mount packages. These parts are Active status and ROHS3 compliant. Forward voltage variations (0.92 V to 1.3 V) and recovery time differences are within acceptable operating margins for general-purpose rectification applications.

Obsolescence Consideration: ES1A-LTP (Micro Commercial Co) and GF1A (onsemi) carry "Not For New Designs" status. These parts remain available in inventory but are not recommended for new circuit designs. Existing designs utilizing these parts may continue to source them during the transition period.

Frequently Asked Questions (FAQ)

Q: Can RS1A-E3/5AT directly replace RS1A-M3/5AT?

A: Yes. RS1A-E3/5AT is a parametric equivalent with identical electrical specifications (50 V, 1 A, 1.3 V forward voltage, 150 ns recovery time) and the same DO-214AC package. The difference is packaging format: RS1A-E3/5AT is supplied in Cut Tape & Digi-Reel format while RS1A-M3/5AT is supplied in Tape & Reel format. Both are Active status products.

Q: What is the difference between parametric equivalents and upgrades?

A: Parametric equivalents maintain identical electrical specifications and package configuration. Upgrades exceed one or more electrical specifications (such as voltage rating or temperature range) while maintaining the same current rating and package type. RGF1B is an upgrade with 100 V rating versus the 50 V rating of RS1A-M3/5AT.

Q: Are cross-manufacturer parts suitable for direct substitution?

A: Cross-manufacturer parts meeting the core specifications (50 V reverse voltage, 1 A current, DO-214AC package) are suitable for direct substitution in most applications. Variations in forward voltage (0.92 V to 1.3 V) and recovery time (25 ns to 2000 ns) are within acceptable operating margins for general-purpose rectification. Circuit-specific requirements should be evaluated for applications with tight voltage or timing constraints.

Q: Why do some parts show "Not For New Designs" status?

A: Parts designated "Not For New Designs" (ES1A-LTP and GF1A) are in end-of-life phase. These parts remain available for existing designs and legacy applications but are not recommended for new circuit development. Active status parts should be selected for new designs.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Tape & Reel, Cut Tape & Digi-Reel, or Bulk) does not affect electrical performance. Format selection is determined by assembly process requirements, inventory management, and supply chain logistics. All parts in the same electrical specification class perform identically in circuit operation.

Q: What is the significance of forward voltage variation among substitute parts?

A: Forward voltage variation (0.92 V to 1.3 V at 1 A) affects power dissipation and voltage drop across the diode during conduction. Parts with lower forward voltage (ES1A-13-F at 0.92 V) generate less heat and provide lower voltage drop. Parts with higher forward voltage (RS1A-M3/5AT at 1.3 V) are acceptable where circuit design accommodates the additional voltage drop. Selection depends on power budget and thermal management requirements.

Q: Can RGF1B be used in place of RS1A-M3/5AT in all applications?

A: RGF1B can be used in applications designed for RS1A-M3/5AT because it exceeds the voltage specification (100 V versus 50 V). The higher voltage rating provides additional safety margin. However, circuit design should be verified to confirm that the 100 V rating does not introduce unintended performance changes. The extended temperature range (-65°C to 175°C) may also affect thermal management considerations.

Q: What compliance certifications are maintained across substitute parts?

A: All Active status substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited). REACH status is "REACH Unaffected" across all parts. ECCN classification is EAR99 for all parts. These certifications ensure regulatory compliance and supply chain compatibility across all substitute options.

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