S1DLH Equivalent & Substitute Parts

Part Overview

The S1DLH is a 1A, 200V standard recovery rectifier diode manufactured by Taiwan Semiconductor Corporation in SOD-123 surface mount packaging. This component is classified as not for new designs, indicating its legacy status in the product lifecycle. The part carries automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. Due to its discontinued design status, identification of functionally equivalent substitute components is necessary for ongoing maintenance, repair, and legacy system support applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 1 A
Speed Classification	Standard Recovery >500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	1.8	µs
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Operating Temperature - Junction	-55 to 175	°C
Package / Case	SOD-123	-
Grade	Automotive	-
Qualification	AEC-Q101	-

Substitute Part Grouping Explanation

Substitution of the S1DLH is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
Speed Classification: Standard Recovery >500ns, > 200mA (Io)
Operating Temperature - Junction: -55°C to 175°C

Mechanical & Compliance Criteria:

Mounting Type: Surface Mount
Grade: Automotive
Qualification: AEC-Q101
RoHS Status: ROHS3 Compliant
Manufacturer: Taiwan Semiconductor Corporation

The S1DLWH qualifies as a direct substitute based on matching all electrical parameters and maintaining automotive-grade qualification with AEC-Q101 certification. The primary distinction is the package variant (SOD-123W versus SOD-123) and improved reverse leakage characteristics in the substitute part.

Parameter Comparison

Parameter	S1DLH (Main Part)	S1DLWH (Substitute)	Match Status
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	Equivalent
Speed Classification	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 200 V	1 µA @ 200 V	Substitute Superior
Operating Temperature - Junction	-55°C to 175°C	-55°C to 175°C	Equivalent
Package / Case	SOD-123	SOD-123W	Different Package
Grade	Automotive	Automotive	Equivalent
Qualification	AEC-Q101	AEC-Q101	Equivalent
Product Status	Not For New Designs	Active	Substitute Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent

Engineering Selection Recommendations

The S1DLWH is the manufacturer-recommended substitute for the S1DLH. Selection of the S1DLWH is supported by the following engineering factors:

Compliance & Certification: Both parts maintain automotive-grade qualification under AEC-Q101 and comply with RoHS3 requirements, ensuring regulatory continuity in automotive and industrial applications.

Electrical Performance: The S1DLWH delivers identical electrical specifications across all critical parameters: 200V reverse voltage rating, 1A average rectified current, and 1.1V forward voltage drop. The substitute exhibits superior reverse leakage performance (1 µA versus 5 µA), indicating improved long-term reliability characteristics.

Product Lifecycle Status: The S1DLWH carries active product status, ensuring ongoing availability and manufacturing support, whereas the S1DLH is designated not for new designs. This distinction makes the S1DLWH the appropriate choice for sustained supply chain management.

Package Consideration: The S1DLWH utilizes SOD-123W packaging compared to the S1DLH's SOD-123 package. Both are surface mount configurations with compatible footprint dimensions for standard PCB assembly processes. PCB layout verification is required to confirm mechanical fit within existing designs.

Frequently Asked Questions (FAQ)

Q: Can the S1DLWH directly replace the S1DLH in existing circuit designs?

A: The S1DLWH provides electrical equivalence across all specified parameters. However, the package variant (SOD-123W versus SOD-123) requires verification of PCB footprint compatibility. Both packages are surface mount configurations with similar dimensional characteristics, but layout confirmation is necessary before implementation.

Q: What is the significance of the improved reverse leakage specification in the S1DLWH?

A: The S1DLWH exhibits reverse leakage of 1 µA at 200V compared to 5 µA in the S1DLH. This represents enhanced leakage performance and indicates improved long-term reliability and reduced power dissipation in reverse bias conditions.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the S1DLH and S1DLWH carry automotive-grade classification with AEC-Q101 qualification, confirming suitability for automotive and industrial applications requiring automotive-level reliability standards.

Q: Why is the S1DLH marked as not for new designs?

A: The S1DLH designation reflects its legacy status in the product lifecycle. The S1DLWH, as the active substitute with equivalent electrical performance and superior reverse leakage characteristics, is the recommended component for ongoing applications and new designs.

Q: Are there any differences in temperature operating range between these parts?

A: No. Both parts operate across the identical junction temperature range of -55°C to 175°C, ensuring thermal performance equivalence across all operating conditions.

Q: What compliance standards apply to both parts?

A: Both the S1DLH and S1DLWH comply with RoHS3 requirements and are REACH unaffected. Both carry ECCN classification EAR99 and HTSUS code 8541.10.0080, ensuring regulatory compliance for export and supply chain applications.

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