FR1G-13 Equivalent & Substitute Parts

Part Overview

The FR1G-13 is a fast recovery rectifier diode manufactured by Diodes Incorporated, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount SMB package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs. Substitute parts must maintain electrical performance within the specified voltage, current, and thermal parameters while accommodating available packaging and compliance standards.

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
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 ~ 175°C	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the FR1G-13 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 400 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Package / Case: Must be DO-214AA (SMB) or compatible surface mount package
Mounting Type: Must be Surface Mount
Speed Classification: Must be Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Reverse Recovery Time (trr): Lower values indicate improved performance
Voltage - Forward (Vf) (Max) @ If: Values at or below 1.3 V @ 1 A are acceptable
Current - Reverse Leakage @ Vr: Values at or below 5 µA @ 400 V are acceptable
Operating Temperature - Junction: Must support -65°C minimum and 175°C maximum or equivalent range

Substitute parts meeting all primary criteria are functionally equivalent for direct replacement. Parts with higher current ratings (2 A, 3 A) are acceptable substitutes when voltage and package specifications are maintained, as they provide additional design margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status	RoHS Status
FR1G-13	Diodes Incorporated	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-214AA, SMB	-65 ~ 175	Discontinued	RoHS non-compliant
RS1AB-13-F	Diodes Incorporated	50	1	1.3 @ 1 A	150	5 @ 50 V	DO-214AA, SMB	-65 ~ 150	Active	ROHS3 Compliant
CMR1F-04M TR13 PBFREE	Central Semiconductor Corp	400	1	1.3 @ 1 A	150	5 @ 400 V	DO-214AC, SMA	-65 ~ 150	Active	ROHS3 Compliant
ER1G-LTP	Micro Commercial Co	400	1	1.25 @ 1 A	35	5 @ 400 V	DO-214AA, SMB	-65 ~ 175	Active	ROHS3 Compliant
ES2G R5G	Taiwan Semiconductor Corporation	400	2	1.3 @ 2 A	35	10 @ 400 V	DO-214AA, SMB	-55 ~ 150	Discontinued	ROHS3 Compliant
STTH1R04U	STMicroelectronics	400	1	1.5 @ 1 A	30	5 @ 400 V	DO-214AA, SMB	-40 ~ 175	Active	ROHS3 Compliant
STTH1R04UY	STMicroelectronics	400	1	1.6 @ 1 A	30	5 @ 400 V	DO-214AA, SMB	-40 ~ 175	Active	ROHS3 Compliant
STTH3R04U	STMicroelectronics	400	3	1.5 @ 3 A	35	5 @ 400 V	DO-214AA, SMB	-40 ~ 175	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The following parts satisfy all primary substitution criteria and are recommended as direct replacements for the FR1G-13:

ER1G-LTP (Micro Commercial Co): Maintains 400 V / 1 A specifications in identical DO-214AA SMB package. Offers improved reverse recovery time (35 ns vs. 150 ns) and lower forward voltage (1.25 V vs. 1.3 V). ROHS3 compliant with active product status. Operating temperature range extends to 175°C, matching the original specification.
STTH1R04U (STMicroelectronics): Meets 400 V / 1 A requirements in DO-214AA SMB package. Provides superior reverse recovery time (30 ns). ROHS3 compliant with active status. Operating temperature maximum of 175°C is supported.
STTH1R04UY (STMicroelectronics): Identical electrical specifications to STTH1R04U with automotive-grade qualification (AEC-Q101). Suitable for applications requiring automotive-level reliability. ROHS3 compliant, active product status.

Alternative Substitutes (Conditional Use):

CMR1F-04M TR13 PBFREE (Central Semiconductor Corp): Maintains 400 V / 1 A specifications with identical electrical performance. Package variant is DO-214AC (SMA) rather than SMB; verify PCB footprint compatibility. ROHS3 compliant, active status. Operating temperature range limited to 150°C.
STTH3R04U (STMicroelectronics): Rated for 400 V / 3 A, providing increased current capacity. Suitable for designs requiring additional margin or higher current handling. ROHS3 compliant, active status. Operating temperature maximum of 175°C is supported.

Not Recommended:

RS1AB-13-F (Diodes Incorporated): Voltage rating of 50 V is insufficient for 400 V application requirements. Not suitable for direct substitution.
ES2G R5G (Taiwan Semiconductor Corporation): While meeting voltage and package requirements, this part is discontinued at DiGi Electronics and rated for 2 A, exceeding the 1 A requirement. Operating temperature range limited to 150°C.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant, addressing the RoHS non-compliance status of the original FR1G-13. Selection should account for specific application compliance requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can RS1AB-13-F replace the FR1G-13?

A: No. The RS1AB-13-F is rated for 50 V maximum reverse voltage, while the FR1G-13 requires 400 V operation. This part is not electrically compatible for this application.

Q: What is the primary difference between ER1G-LTP and STTH1R04U?

A: Both parts meet the 400 V / 1 A specifications and use the DO-214AA SMB package. The ER1G-LTP offers lower forward voltage (1.25 V vs. 1.5 V) and is manufactured by Micro Commercial Co. The STTH1R04U is manufactured by STMicroelectronics and provides faster reverse recovery time (30 ns vs. 35 ns). Selection depends on supplier availability and specific circuit requirements.

Q: Can STTH3R04U be used instead of FR1G-13?

A: Yes. The STTH3R04U maintains the 400 V voltage rating and DO-214AA SMB package. The 3 A current rating exceeds the 1 A requirement, providing additional design margin. This substitution is acceptable when higher current capacity is beneficial or when supply constraints favor this part.

Q: Does the CMR1F-04M TR13 PBFREE package difference affect compatibility?

A: The CMR1F-04M uses DO-214AC (SMA) packaging instead of DO-214AA (SMB). While both are surface mount packages, the physical dimensions and PCB footprints differ. Verify that the SMA footprint is compatible with the existing PCB design before selecting this substitute.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. All recommended substitutes (ER1G-LTP, STTH1R04U, STTH1R04UY, and STTH3R04U) are ROHS3 compliant, addressing the RoHS non-compliance status of the discontinued FR1G-13.

Q: What is the significance of the AEC-Q101 qualification on STTH1R04UY?

A: AEC-Q101 is an automotive-grade qualification standard. The STTH1R04UY meets this qualification, making it suitable for automotive applications requiring enhanced reliability and quality assurance. Non-automotive applications do not require this qualification.

Q: Why is the reverse recovery time important for substitution?

A: Reverse recovery time (trr) affects switching speed and efficiency in rectifier circuits. The FR1G-13 specifies 150 ns. Recommended substitutes offer equal or faster recovery times (30–35 ns), which improves circuit performance and reduces switching losses. Faster recovery times are always acceptable in substitution.

Q: Can I use a higher current-rated diode like STTH3R04U in a 1 A circuit?

A: Yes. A 3 A diode operates safely in a 1 A circuit. The higher current rating provides design margin and does not negatively affect circuit operation. Forward voltage and reverse recovery characteristics remain within acceptable ranges for the application.

Q: What should I verify before finalizing a substitute part selection?

A: Confirm the following: (1) Voltage rating meets or exceeds 400 V, (2) Current rating meets or exceeds 1 A, (3) Package footprint (DO-214AA SMB or verified compatible alternative) matches PCB design, (4) Operating temperature range supports application requirements, (5) Supplier availability and lead time, (6) Compliance certifications align with product requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message