RSFJL Equivalent & Substitute Parts

Part Overview

The RSFJL is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 600 V DC reverse voltage and 500 mA average rectified current in a Sub SMA surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original part is no longer available through standard distribution channels.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	500	mA
Voltage - Forward (Vf) (Max) @ If	1.3 @ 500 mA	V
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5 @ 600 V	µA
Capacitance @ Vr, F	4 @ 4V, 1MHz	pF
Package / Case	DO-219AB	-
Mounting Type	Surface Mount	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the RSFJL rectifier diode is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 600 V
Current - Average Rectified (Io): Must equal or exceed 500 mA
Voltage - Forward (Vf) (Max) @ If: Must not exceed 1.3 V at rated current
Reverse Recovery Time (trr): Must not exceed 500 ns for fast recovery operation
Current - Reverse Leakage @ Vr: Must not exceed 5 µA at 600 V

Mechanical Compatibility Criteria:

Package / Case: Must be DO-219AB (Sub SMA)
Mounting Type: Must be Surface Mount
Operating Temperature - Junction: Must support -55°C to 150°C range

Compliance Requirements:

RoHS Status: Must be ROHS3 Compliant
Moisture Sensitivity Level (MSL): Must be 1 (Unlimited)

Substitute parts are grouped into two categories: parametric equivalents (identical electrical and mechanical specifications) and functional alternatives (higher current rating with compatible package).

Parameter Comparison

Part Number	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Status
RSFJL	600	500	1.3 @ 500 mA	500	5 @ 600 V	DO-219AB	-55 to 150	Not For New Designs
RS1JLW	600	1000	1.3 @ 1 A	150	5 @ 600 V	SOD-123W	-55 to 175	Active
RSFJL M2G	600	500	1.3 @ 500 mA	250	5 @ 600 V	DO-219AB	-55 to 150	Active
RSFJL MHG	600	500	1.3 @ 500 mA	250	5 @ 600 V	DO-219AB	-55 to 150	Active
RSFJL MQG	600	500	1.3 @ 500 mA	250	5 @ 600 V	DO-219AB	-55 to 150	Active
RSFJL MTG	600	500	1.3 @ 500 mA	250	5 @ 600 V	DO-219AB	-55 to 150	Active
RSFJL R3G	600	500	1.3 @ 500 mA	250	5 @ 600 V	DO-219AB	-55 to 150	Discontinued at DiGi Electronics
RSFJL RFG	600	500	1.3 @ 500 mA	250	5 @ 600 V	DO-219AB	-55 to 150	Active
RSFJL RHG	600	500	1.3 @ 500 mA	250	5 @ 600 V	DO-219AB	-55 to 150	Active
RSFJL RQG	600	500	1.3 @ 500 mA	250	5 @ 600 V	DO-219AB	-55 to 150	Active
RSFJL RTG	600	500	1.3 @ 500 mA	250	5 @ 600 V	DO-219AB	-55 to 150	Active

Engineering Selection Recommendations

Parametric Equivalent Substitutes (Recommended Primary Options):

The following parts are direct parametric equivalents to the RSFJL with identical electrical ratings and package specifications. These parts maintain the same 600 V reverse voltage, 500 mA current rating, and DO-219AB Sub SMA package:

RSFJL M2G: Active product status with 250 ns reverse recovery time. Inventory: 719 units.
RSFJL MHG: Active product status with 250 ns reverse recovery time. Inventory: 1168 units.
RSFJL MQG: Active product status with 250 ns reverse recovery time. Inventory: 685 units.
RSFJL MTG: Active product status with 250 ns reverse recovery time. Inventory: 741 units.
RSFJL RFG: Active product status with 250 ns reverse recovery time. Inventory: 1087 units.
RSFJL RHG: Active product status with 250 ns reverse recovery time. Inventory: 822 units.
RSFJL RQG: Active product status with 250 ns reverse recovery time. Inventory: 1040 units.
RSFJL RTG: Active product status with 250 ns reverse recovery time. Inventory: 15600 units.

All parametric equivalents are ROHS3 compliant with MSL 1 rating and support the full -55°C to 150°C operating temperature range.

Functional Alternative (Higher Current Rating):

RS1JLW: This part provides a higher current rating of 1 A (versus 500 mA) while maintaining 600 V reverse voltage rating. The package differs (SOD-123W instead of DO-219AB), requiring PCB layout modification. This part is Active with 32611 units in inventory and supports an extended temperature range to 175°C. The reverse recovery time is improved at 150 ns. This option is suitable only when package footprint changes are acceptable.

Discontinued Part (Limited Availability):

RSFJL R3G: Discontinued at DiGi Electronics but remains available with 1068 units in inventory. This part meets all parametric requirements but should be considered only when other active alternatives are unavailable.

Frequently Asked Questions (FAQ)

Q: Can RSFJL M2G, MHG, MQG, MTG, RFG, RHG, RQG, and RTG be used interchangeably with RSFJL?

A: Yes. These parts are parametric equivalents with identical voltage ratings (600 V), current ratings (500 mA), forward voltage characteristics (1.3 V @ 500 mA), and package specifications (DO-219AB Sub SMA). All are ROHS3 compliant with MSL 1 rating. The primary difference is reverse recovery time: the original RSFJL has 500 ns while the equivalents have 250 ns, which represents improved performance. All support the -55°C to 150°C operating temperature range.

Q: What is the difference between the RSFJL variants (M2G, MHG, MQG, MTG, RFG, RHG, RQG, RTG)?

A: The variants represent different manufacturing date codes or internal revisions from Taiwan Semiconductor Corporation. All variants maintain identical electrical specifications and package configurations. Selection among variants can be based on inventory availability or specific procurement requirements.

Q: Can RS1JLW replace RSFJL in my application?

A: RS1JLW is a functional alternative with higher current capacity (1 A versus 500 mA) and improved reverse recovery time (150 ns versus 500 ns). However, the package differs: RS1JLW uses SOD-123W while RSFJL uses DO-219AB Sub SMA. This requires PCB layout modification and cannot be used as a direct drop-in replacement. Use RS1JLW only when package footprint changes are feasible and the higher current rating is acceptable for your circuit.

Q: Is RSFJL R3G still available?

A: RSFJL R3G is discontinued at DiGi Electronics but remains available through inventory with 1068 units. This part meets all parametric requirements identical to the original RSFJL. However, active alternatives (M2G, MHG, MQG, MTG, RFG, RHG, RQG, RTG) are preferred for new procurement due to their active product status.

Q: What compliance certifications apply to these substitute parts?

A: All substitute parts listed are ROHS3 compliant and have MSL 1 (Unlimited) moisture sensitivity rating. All carry REACH Unaffected status and EAR99 ECCN classification. These certifications match the original RSFJL specifications.

Q: Does the improved reverse recovery time in substitute parts affect circuit performance?

A: The parametric equivalents feature 250 ns reverse recovery time compared to the original RSFJL at 500 ns. This represents faster switching behavior, which generally improves efficiency in rectification circuits. This change is not detrimental and typically enhances performance in fast recovery applications exceeding 200 mA.

Q: What is the operating temperature range for these parts?

A: All parametric equivalents (M2G, MHG, MQG, MTG, RFG, RHG, RQG, RTG) support -55°C to 150°C junction temperature range, identical to the original RSFJL. RS1JLW extends this to -55°C to 175°C, providing additional thermal margin.

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