RS2G-13 Equivalent & Substitute Parts

Part Overview

The RS2G-13 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 400 V DC reverse voltage and 1.5 A average rectified current in a Surface Mount SMB (DO-214AA) package. This device is classified as a fast recovery diode with a reverse recovery time of 150 ns, suitable for standard rectification applications requiring moderate current handling at 400 V operation.

The RS2G-13 is discontinued at DiGi Electronics and carries RoHS non-compliant status. Equivalent and substitute parts are necessary for new designs, ongoing production support, and compliance with current regulatory requirements. Substitute devices must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and availability constraints.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitute parts for the RS2G-13 are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Package / Case: DO-214AA, SMB (Surface Mount)
Mounting Type: Surface Mount
Current - Average Rectified (Io): 1.5 A or greater

Secondary Compatibility Factors:

Speed Classification: Fast Recovery or Standard Recovery
Reverse Recovery Time (trr): Specified where applicable
Current - Reverse Leakage @ Vr: Measured at 400 V
Operating Temperature Range: Must accommodate application requirements
RoHS Compliance: ROHS3 Compliant status preferred for new designs

Substitutes are classified into two categories:

Parametric Equivalents: Identical electrical ratings (400 V, 1.5 A) with identical or superior performance characteristics. These are direct replacements with no circuit redesign required.
Manufacturer Recommended Alternatives: Parts with matching voltage and package specifications but differing current ratings or recovery characteristics. These require circuit-level evaluation for compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Speed	Ir @ Vr	Package	Product Status	RoHS Status
RS2G-13	Diodes Incorporated	400 V	1.5 A	1.3 V @ 1.5 A	150 ns	Fast Recovery ≤ 500ns	5 µA @ 400 V	DO-214AA, SMB	Discontinued	RoHS non-compliant
RS2G-13-F	Diodes Incorporated	400 V	1.5 A	1.3 V @ 1.5 A	150 ns	Fast Recovery ≤ 500ns	5 µA @ 400 V	DO-214AA, SMB	Active	ROHS3 Compliant
MRS1504T3G	onsemi	400 V	1.5 A	1.04 V @ 1.5 A	—	Standard Recovery > 500ns	1 µA @ 400 V	DO-214AA, SMB	Not For New Designs	ROHS3 Compliant
STTH1R04U	STMicroelectronics	400 V	1 A	1.5 V @ 1 A	30 ns	Fast Recovery ≤ 500ns	5 µA @ 400 V	DO-214AA, SMB	Active	ROHS3 Compliant
STTH1R04UY	STMicroelectronics	400 V	1 A	1.6 V @ 1 A	30 ns	Fast Recovery ≤ 500ns	5 µA @ 400 V	DO-214AA, SMB	Active	ROHS3 Compliant
STTH3R04U	STMicroelectronics	400 V	3 A	1.5 V @ 3 A	35 ns	Fast Recovery ≤ 500ns	5 µA @ 400 V	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalent):

RS2G-13-F is the primary substitute for RS2G-13. Both devices are manufactured by Diodes Incorporated with identical electrical specifications: 400 V reverse voltage, 1.5 A average rectified current, 1.3 V forward voltage drop at 1.5 A, and 150 ns reverse recovery time. RS2G-13-F is currently in active production status with ROHS3 compliance, addressing the regulatory limitations of the discontinued RS2G-13. The only difference is packaging format (Tape & Reel versus bulk), which does not affect electrical performance. This substitution requires no circuit modification.

Alternative Substitutes with Current Derating:

STTH1R04U and STTH1R04UY are STMicroelectronics devices rated for 1 A average rectified current, representing a 33% current reduction compared to the RS2G-13 specification of 1.5 A. Both maintain 400 V reverse voltage rating and DO-214AA SMB package compatibility. STTH1R04U is available in Cut Tape & Digi-Reel packaging, while STTH1R04UY includes automotive-grade qualification (AEC-Q101) in Tape & Reel format. These substitutes are suitable only for applications where the actual circuit current requirement does not exceed 1 A. Both devices feature superior reverse recovery time (30 ns versus 150 ns), enabling faster switching performance.

Alternative Substitute with Current Upgrade:

STTH3R04U is rated for 3 A average rectified current, providing 100% current margin above the RS2G-13 specification. This device maintains 400 V reverse voltage and DO-214AA SMB package compatibility. STTH3R04U is suitable for applications requiring higher current capacity or where thermal margin is a design priority. The reverse recovery time of 35 ns provides improved switching characteristics.

Legacy Alternative (Not Recommended for New Designs):

MRS1504T3G is an onsemi device with matching 400 V and 1.5 A specifications. However, this part carries "Not For New Designs" product status, indicating manufacturer discontinuation trajectory. While ROHS3 compliant, this device exhibits standard recovery characteristics (>500ns) compared to the fast recovery profile of RS2G-13, potentially affecting circuit performance in high-frequency applications. This substitute is acceptable only for legacy system maintenance where design changes are not feasible.

Compliance Consideration:

All recommended substitutes carry ROHS3 compliance status, addressing the RoHS non-compliant classification of the discontinued RS2G-13. This compliance upgrade is mandatory for new designs and production systems subject to regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can RS2G-13-F be used as a direct replacement for RS2G-13 without circuit modification?

A: Yes. RS2G-13-F is a parametric equivalent with identical electrical specifications: 400 V reverse voltage, 1.5 A average rectified current, 1.3 V forward voltage drop at 1.5 A, and 150 ns reverse recovery time. The only difference is packaging format (Tape & Reel). No circuit redesign is required.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Recovery speed refers to the reverse recovery time (trr), which is the time required for a diode to transition from forward conduction to reverse blocking when the applied voltage reverses. Fast recovery diodes (trr ≤ 500ns) switch faster than standard recovery diodes (trr > 500ns). Fast recovery diodes reduce switching losses and electromagnetic interference in high-frequency applications. The RS2G-13 specifies 150 ns fast recovery, while MRS1504T3G specifies standard recovery (>500ns).

Q: Can STTH1R04U or STTH1R04UY be used in place of RS2G-13?

A: These substitutes are compatible only if the actual circuit current requirement does not exceed 1 A. Both devices are rated for 1 A average rectified current, which is 33% below the RS2G-13 specification of 1.5 A. Exceeding the rated current will cause excessive heat generation and potential device failure. However, both devices offer superior reverse recovery time (30 ns), enabling faster switching performance in applications within the 1 A current limit.

Q: What is the advantage of STTH3R04U over RS2G-13?

A: STTH3R04U is rated for 3 A average rectified current, providing 100% current margin above RS2G-13. This higher current rating allows operation at higher power levels or provides thermal margin in existing designs. STTH3R04U also features a 35 ns reverse recovery time, faster than RS2G-13's 150 ns, improving switching performance. The trade-off is that STTH3R04U may be physically larger or have different thermal characteristics depending on the specific application.

Q: Why is MRS1504T3G marked "Not For New Designs"?

A: "Not For New Designs" status indicates that the manufacturer (onsemi) is discontinuing this product line. While currently available and ROHS3 compliant, this designation signals that long-term availability is not guaranteed. New designs should use actively produced alternatives such as RS2G-13-F or STMicroelectronics devices to ensure supply chain continuity.

Q: Does the DO-214AA SMB package differ between manufacturers?

A: No. The DO-214AA SMB package is a standardized surface mount package defined by industry specifications. All parts listed in this reference use the identical package footprint and pinout, ensuring mechanical and electrical compatibility on printed circuit boards. Packaging format differences (Cut Tape, Tape & Reel, or bulk) affect only handling and assembly processes, not electrical performance.

Q: What is ROHS3 compliance, and why does it matter?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) is a European Union regulation limiting the use of specific hazardous materials in electrical and electronic equipment. ROHS3 compliance restricts lead, cadmium, mercury, hexavalent chromium, and certain brominated flame retardants. The RS2G-13 is RoHS non-compliant, while all substitute parts listed are ROHS3 compliant. This compliance is mandatory for products sold in the EU and increasingly required by global manufacturers and procurement standards.

Q: Can I use STTH1R04UY (automotive grade) in non-automotive applications?

A: Yes. Automotive-grade components meet more stringent qualification standards (AEC-Q101) and typically have wider operating temperature ranges and higher reliability requirements. Using automotive-grade components in non-automotive applications provides additional margin and reliability without penalty. STTH1R04UY operates from -40°C to 175°C, compared to standard industrial grades, making it suitable for demanding environments.

Q: What is reverse leakage current, and why does it vary between substitutes?

A: Reverse leakage current (Ir) is the small current that flows through a reverse-biased diode. RS2G-13 specifies 5 µA at 400 V, while MRS1504T3G specifies 1 µA at 400 V. Lower reverse leakage indicates better diode quality and lower power dissipation in reverse bias conditions. MRS1504T3G's lower leakage is advantageous in low-power or precision applications, but the difference is negligible in most standard rectification circuits.

Q: What does "Tape & Reel (TR)" packaging mean?

A: Tape & Reel is an automated assembly format where components are mounted on a continuous plastic carrier tape wound on a reel. This format is optimized for high-volume surface mount assembly using pick-and-place equipment. Cut Tape (CT) & Digi-Reel format provides smaller quantities on cut sections of the same tape. Both formats contain identical components; the difference is quantity and handling method for manufacturing processes.

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