RSFDLH Fast Recovery Rectifier Diode Equivalent & Substitute Parts

Part Overview

The RSFDLH is a 150 nanosecond fast recovery rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 200V DC reverse voltage and 500mA average rectified current. This component is packaged in SOD-123 surface mount configuration and qualified to AEC-Q101 automotive standards. The RSFDLH carries a product status designation of "Not For New Designs," indicating that this part is obsolete or in end-of-life phase. Identification of equivalent and substitute parts is necessary to support existing designs, facilitate production continuity, and enable migration to active product lines where applicable.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	500	mA
Voltage - Forward (Vf) (Max) @ If	1.3 @ 500 mA	V
Reverse Recovery Time (trr)	150	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Operating Temperature - Junction	-55 to 150	°C
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the RSFDLH is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 200V
Reverse Recovery Time (trr) must equal or be faster than 150ns
Current - Average Rectified (Io) must equal or exceed 500mA
Voltage - Forward (Vf) characteristics must be compatible with circuit design
Current - Reverse Leakage must not exceed specified limits

Mechanical and Compliance Criteria:

Mounting Type: Surface Mount
Grade: Automotive
Qualification: AEC-Q101
RoHS3 Compliance required
REACH Unaffected status required

The RS1DLWH qualifies as a manufacturer-recommended substitute because it meets or exceeds all critical electrical parameters while maintaining automotive-grade qualification and AEC-Q101 certification. The substitute exhibits higher current capacity (1A versus 500mA), identical reverse voltage rating (200V), matching reverse recovery time (150ns), and compatible forward voltage characteristics.

Parameter Comparison

Parameter	RSFDLH	RS1DLWH	Compatibility
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	Identical
Current - Average Rectified (Io)	500 mA	1 A	Substitute rated higher
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 500 mA	1.3 V @ 1 A	Compatible
Reverse Recovery Time (trr)	150 ns	150 ns	Identical
Current - Reverse Leakage @ Vr	5 µA @ 200 V	5 µA @ 200 V	Identical
Operating Temperature - Junction	-55 to 150 °C	-55 to 175 °C	Substitute rated higher
Grade	Automotive	Automotive	Identical
Qualification	AEC-Q101	AEC-Q101	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
REACH Status	REACH Unaffected	REACH Unaffected	Identical

Engineering Selection Recommendations

The RS1DLWH is the manufacturer-recommended substitute for the RSFDLH. Selection of this substitute is supported by the following engineering factors:

Product Status Alignment: The RSFDLH carries "Not For New Designs" status, indicating end-of-life phase. The RS1DLWH maintains "Active" product status, ensuring long-term availability and supply chain continuity.

Electrical Performance: The RS1DLWH meets all critical electrical specifications of the RSFDLH. The higher current rating (1A versus 500mA) provides design margin without introducing incompatibility. Reverse voltage, recovery time, and leakage current specifications are identical.

Compliance and Certification: Both parts maintain AEC-Q101 automotive qualification and ROHS3 compliance. The RS1DLWH extends the operating temperature range to 175°C, providing additional thermal margin for automotive applications.

Package Consideration: The RS1DLWH utilizes SOD-123W packaging, which is mechanically compatible with SOD-123 footprints in surface mount applications. Verification of PCB layout accommodation for the wider package variant is required during design transition.

Frequently Asked Questions (FAQ)

Q: Can the RS1DLWH directly replace the RSFDLH in existing designs?

A: The RS1DLWH is electrically compatible with the RSFDLH across all critical parameters. Physical package compatibility (SOD-123W versus SOD-123) requires verification of PCB footprint dimensions. The higher current rating of the RS1DLWH does not create incompatibility in circuits designed for 500mA operation.

Q: What is the significance of the higher current rating on the RS1DLWH?

A: The RS1DLWH is rated for 1A average rectified current compared to the RSFDLH's 500mA rating. This higher rating provides design margin and does not negatively impact circuits operating at or below 500mA. The substitute will not degrade performance in existing applications.

Q: Are there package differences between RSFDLH and RS1DLWH?

A: The RSFDLH uses SOD-123 packaging while the RS1DLWH uses SOD-123W packaging. Both are surface mount configurations. The SOD-123W package is wider than SOD-123. PCB layout verification is necessary to confirm footprint compatibility before implementation.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the RSFDLH and RS1DLWH are qualified to AEC-Q101 automotive standards and carry Automotive grade designation. Both maintain ROHS3 compliance and REACH Unaffected status.

Q: What is the difference in operating temperature range?

A: The RSFDLH operates from -55°C to 150°C junction temperature. The RS1DLWH extends this range to -55°C to 175°C. The extended upper temperature limit on the RS1DLWH provides additional thermal margin for automotive applications.

Q: Are the reverse recovery time specifications identical?

A: Yes. Both the RSFDLH and RS1DLWH specify 150 nanosecond reverse recovery time, ensuring identical switching performance in fast recovery rectifier applications.

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