RS1G 400V 1A General Purpose Rectifier Diode - Equivalent & Substitute Parts

Part Overview

The RS1G is a general purpose rectifier diode manufactured by onsemi, rated for 400V DC reverse voltage and 1A 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 This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Organizations using RS1G in existing designs or requiring replacement stock must evaluate qualified substitute parts that maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	10	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the RS1G are classified into three categories based on electrical and mechanical compatibility:

Direct Electrical Equivalents (Same Package, Same Ratings) Parts that maintain identical voltage (400V), current (1A), forward voltage (1.3V @ 1A), recovery time (150ns), and reverse leakage (5µA @ 400V) specifications in the DO-214AC (SMA) package. These parts are pin-compatible and functionally interchangeable without circuit modification.

Similar Electrical Ratings (Same Package, Comparable Performance) Parts that meet the core voltage and current requirements (400V, 1A) but may differ in secondary parameters such as forward voltage, recovery speed, or reverse leakage. These parts are mechanically compatible but require verification of application-specific performance requirements.

Upgraded or Alternative Package Options Parts that meet electrical requirements but use alternative surface mount packages (DO-214BA) or have enhanced temperature ratings. These require PCB layout verification for mechanical compatibility.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): Must be ≥ 400V
Current - Average Rectified (Io): Must be ≥ 1A
Voltage - Forward (Vf) (Max) @ If: Must be ≤ 1.3V @ 1A
Speed: Fast Recovery ≤ 500ns preferred for switching applications
Reverse Recovery Time (trr): 150ns or lower preferred
Current - Reverse Leakage @ Vr: Must be ≤ 5µA @ 400V
Package / Case: DO-214AC (SMA) for direct mechanical compatibility
Operating Temperature - Junction: Must support application temperature range

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (V)	Speed	trr (ns)	Ir @ Vr (µA)	Package	Temp Range (°C)	Status
RS1G	onsemi	400	1	1.3	Fast Recovery ≤ 500ns	150	5 @ 400V	DO-214AC (SMA)	-55 to 150	Not For New Designs
MRA4004T3G	onsemi	400	1	1.1	Standard Recovery >500ns	—	10 @ 400V	DO-214AC (SMA)	-55 to 175	Not For New Designs
MURA140T3G	onsemi	400	2	1.1	Fast Recovery ≤ 500ns	65	5 @ 400V	DO-214AC (SMA)	-65 to 175	Active
NRVA4004T3G	onsemi	400	1	1.1	Standard Recovery >500ns	—	10 @ 400V	DO-214AC (SMA)	-55 to 175	Not For New Designs
CFRA104-G	Comchip Technology	400	1	1.3	Fast Recovery ≤ 500ns	150	5 @ 400V	DO-214AC (SMA)	-55 to 150	Active
RGF1G-E3/67A	Vishay General Semiconductor	400	1	1.3	Fast Recovery ≤ 500ns	150	5 @ 400V	DO-214BA (GF1)	-65 to 175	Active
RS1G-E3/5AT	Vishay General Semiconductor	400	1	1.3	Fast Recovery ≤ 500ns	150	5 @ 400V	DO-214AC (SMA)	-55 to 150	Active
RS1G-E3/61T	Vishay General Semiconductor	400	1	1.3	Fast Recovery ≤ 500ns	150	5 @ 400V	DO-214AC (SMA)	-55 to 150	Active
CMR1F-04M BK PBFREE	Central Semiconductor Corp	400	1	1.3	Fast Recovery ≤ 500ns	150	5 @ 400V	DO-214AC (SMA)	-65 to 150	Active
CMR1F-04M TR13 PBFREE	Central Semiconductor Corp	400	1	1.3	Fast Recovery ≤ 500ns	150	5 @ 400V	DO-214AC (SMA)	-65 to 150	Active
RGF1G-E3/5CA	Vishay General Semiconductor	400	1	1.3	Fast Recovery ≤ 500ns	150	5 @ 1700V	DO-214BA (GF1)	-65 to 175	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Mechanical Compatibility):

RS1G-E3/5AT and RS1G-E3/61T (Vishay General Semiconductor) are direct functional equivalents in the DO-214AC (SMA) package with Active product status. Both maintain the same voltage (400V), current (1A), forward voltage (1.3V @ 1A), recovery time (150ns), and reverse leakage (5µA @ 400V) specifications. These parts are recommended for new procurement to replace RS1G stock in existing designs.

CFRA104-G (Comchip Technology) provides identical electrical specifications and package compatibility with Active product status, offering an alternative source for 400V 1A rectifier diodes in DO-214AC (SMA) packaging.

CMR1F-04M BK PBFREE and CMR1F-04M TR13 PBFREE (Central Semiconductor Corp) match all electrical parameters of RS1G with Active status. The TR13 variant in Tape & Reel packaging is suitable for high-volume production environments.

For Applications Requiring Enhanced Temperature Range:

RGF1G-E3/67A and RGF1G-E3/5CA (Vishay General Semiconductor, SUPERECTIFIER® series) extend the operating temperature range to -65°C to 175°C compared to RS1G's -55°C to 150°C. These parts use the DO-214BA (GF1) package instead of DO-214AC (SMA), requiring PCB layout verification. Both maintain identical electrical specifications (400V, 1A, 1.3V Vf, 150ns trr, 5µA Ir).

For Current-Upgraded Applications:

MURA140T3G (onsemi) doubles the average rectified current to 2A while maintaining 400V voltage rating and fast recovery characteristics (65ns trr). This part is suitable for applications requiring higher current capacity with the same voltage class. Active product status supports long-term availability.

For Cost-Optimized Designs (Non-Critical Switching Applications):

MRA4004T3G and NRVA4004T3G (onsemi) provide 400V 1A ratings with standard recovery characteristics (>500ns) and lower forward voltage (1.1V @ 1A). These parts are suitable for non-switching rectification applications where recovery speed is not critical. Both have extended temperature ranges (-55°C to 175°C) compared to RS1G.

Compliance and Certification:

All substitute parts listed maintain ROHS3 compliance, MSL Level 1 (Unlimited moisture sensitivity), and REACH Unaffected status, matching RS1G environmental and regulatory requirements. NRVA4004T3G includes AEC-Q101 automotive qualification for applications requiring automotive-grade components.

Frequently Asked Questions (FAQ)

Q: Can I directly replace RS1G with MRA4004T3G in my circuit?

A: MRA4004T3G is mechanically compatible (DO-214AC SMA package) and electrically rated for the same voltage (400V) and current (1A). However, it differs in recovery speed (Standard Recovery >500ns vs. Fast Recovery ≤500ns) and forward voltage (1.1V vs. 1.3V). For switching applications requiring fast recovery, this substitution is not recommended. For rectification-only applications, MRA4004T3G is acceptable.

Q: What is the difference between RS1G-E3/5AT and RS1G-E3/61T?

A: Both parts are manufactured by Vishay General Semiconductor and are electrically and mechanically identical to RS1G. They differ only in packaging configuration (tape reel variant designations). Both are Active products suitable for direct replacement. Selection between them depends on procurement and assembly requirements.

Q: Why would I choose MURA140T3G over RS1G?

A: MURA140T3G is rated for 2A average rectified current compared to RS1G's 1A, providing higher current capacity in the same package. It also features faster recovery time (65ns vs. 150ns) and Active product status. Choose MURA140T3G if your application requires higher current handling or improved switching performance.

Q: Are RGF1G-E3/67A and RGF1G-E3/5CA pin-compatible with RS1G?

A: Both Vishay parts use the DO-214BA (GF1) package instead of RS1G's DO-214AC (SMA) package. While both are surface mount packages for similar applications, the physical dimensions and PCB footprints differ. PCB layout verification is required before substitution. Electrically, they are equivalent to RS1G.

Q: Can I use NRVA4004T3G in automotive applications?

A: Yes. NRVA4004T3G is qualified to AEC-Q101 automotive standards, making it suitable for automotive-grade applications. It maintains 400V 1A ratings with standard recovery characteristics and extended temperature range (-55°C to 175°C). Verify that your application's recovery speed requirements are compatible with standard recovery (>500ns) characteristics.

Q: What is the advantage of CMR1F-04M TR13 PBFREE over CMR1F-04M BK PBFREE?

A: Both parts are electrically identical with 400V 1A ratings and fast recovery characteristics. CMR1F-04M TR13 PBFREE is packaged in Tape & Reel (TR) format, optimized for automated assembly and high-volume production. CMR1F-04M BK PBFREE is supplied in Bulk packaging. Selection depends on production volume and assembly process requirements.

Q: Do all substitute parts have the same reverse leakage current as RS1G?

A: No. RS1G specifies 5µA @ 400V reverse leakage. MRA4004T3G and NRVA4004T3G specify 10µA @ 400V. RGF1G-E3/5CA specifies 5µA @ 1700V (different test voltage). For applications sensitive to leakage current, verify the specific leakage rating of the substitute part.

Q: Is RS1G still available for new designs?

A: No. RS1G is classified as "Not For New Designs." For new circuit designs, select from Active-status alternatives such as RS1G-E3/5AT, RS1G-E3/61T, CFRA104-G, CMR1F-04M variants, or MURA140T3G depending on your specific electrical and thermal requirements.

Q: What packaging options are available for 400V 1A rectifier diodes?

A: The primary surface mount packages for 400V 1A rectifier diodes in this product category are DO-214AC (SMA) and DO-214BA (GF1). DO-214AC (SMA) is the standard package used by RS1G, MRA4004T3G, NRVA4004T3G, CFRA104-G, and Central Semiconductor parts. DO-214BA (GF1) is used by Vishay SUPERECTIFIER® series (RGF1G variants). Verify PCB footprint compatibility before selecting alternative packages.

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