AS1D-HF Equivalent & Substitute Parts

Part Overview

The AS1D-HF is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 200 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as Active and carries AEC-Q101 automotive qualification with ROHS3 compliance. The AS1D-HF is supplied in Tape & Reel packaging with 952 pieces currently in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter set. Alternative sources and packaging formats may be required due to inventory availability, supply chain optimization, or design revision cycles.

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 @ 1 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
Speed: Standard Recovery >500ns, > 200mA (Io)
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C to 150°C
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts maintain these core electrical specifications and mechanical compatibility. Variations in reverse leakage current, capacitance, reverse recovery time, and packaging format (Cut Tape vs. Tape & Reel) do not disqualify substitution when the primary performance parameters remain equivalent. Product status and manufacturer source are secondary considerations that may influence selection based on supply chain requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Package	Mounting	Tj [°C]	Product Status	Packaging Format	Inventory [Pcs]
AS1D-HF	Comchip Technology	200	1	1.1 @ 1 A	DO-214AC, SMA	Surface Mount	-55 to 150	Active	Tape & Reel (TR)	952
S1D-HF	Comchip Technology	200	1	1.1 @ 1 A	DO-214AC, SMA	Surface Mount	-55 to 150	Active	Cut Tape (CT) & Digi-Reel®	3760
CS1D-E3/I	Vishay General Semiconductor - Diodes Division	200	1	1.1 @ 1 A	DO-214AC, SMA	Surface Mount	-55 to 150	Obsolete	Cut Tape (CT) & Digi-Reel®	2191
GS1D_R1_00001	Panjit International Inc.	200	1	1.1 @ 1 A	DO-214AC, SMA	Surface Mount	-55 to 150	Active	Tape & Reel (TR)	2120
GS1DWG_R1_00001	Panjit International Inc.	200	1	1.1 @ 1 A	DO-214AC, SMA	Surface Mount	-55 to 150	Not For New Designs	Tape & Reel (TR)	2176
S1D	YAGEO	200	1	1.1	DO-214AC	Surface Mount	—	Active	Cut Tape (CT) & Digi-Reel®	5993
S1D-E3/5AT	Vishay General Semiconductor - Diodes Division	200	1	1.1 @ 1 A	DO-214AC, SMA	Surface Mount	-55 to 150	Active	Cut Tape (CT) & Digi-Reel®	933
S1D-E3/61T	Vishay General Semiconductor - Diodes Division	200	1	1.1 @ 1 A	DO-214AC, SMA	Surface Mount	-55 to 150	Active	Tape & Reel (TR)	126100
S1DHE3_A/H	Vishay General Semiconductor - Diodes Division	200	1	1.1 @ 1 A	DO-214AC, SMA	Surface Mount	-55 to 150	Active	Tape & Reel (TR)	2900
S1DHE3_A/I	Vishay General Semiconductor - Diodes Division	200	1	1.1 @ 1 A	DO-214AC, SMA	Surface Mount	-55 to 150	Active	Tape & Reel (TR)	6218

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance)

S1D-E3/61T (Vishay General Semiconductor - Diodes Division) is the preferred substitute. This part maintains all electrical specifications, carries ROHS3 compliance, and is classified as Active. Inventory availability is 126,100 pieces, providing supply security. Packaging is Tape & Reel format, matching the AS1D-HF supply method.

S1DHE3_A/I (Vishay General Semiconductor - Diodes Division) is an alternative with Active status and AEC-Q101 automotive qualification, identical to the AS1D-HF. Inventory is 6,218 pieces. This part is suitable for applications requiring automotive-grade components.

S1DHE3_A/H (Vishay General Semiconductor - Diodes Division) provides equivalent performance with automotive qualification and Active status. Inventory is 2,900 pieces.

GS1D_R1_00001 (Panjit International Inc.) maintains all core electrical parameters with Active status and ROHS3 compliance. Inventory is 2,120 pieces in Tape & Reel format.

Secondary Substitutes (Alternative Packaging or Status)

S1D-HF (Comchip Technology) is electrically identical to the AS1D-HF but supplied in Cut Tape & Digi-Reel® format. Product status is Active with 3,760 pieces available. This substitute is suitable when alternative packaging formats are acceptable.

S1D-E3/5AT (Vishay General Semiconductor - Diodes Division) is Active with full electrical equivalence. Packaging is Cut Tape & Digi-Reel® with 933 pieces in stock.

S1D (YAGEO) is Active with equivalent electrical specifications. Inventory is 5,993 pieces in Cut Tape & Digi-Reel® format.

Not Recommended for New Designs

CS1D-E3/I (Vishay General Semiconductor - Diodes Division) is classified as Obsolete and should not be selected for new designs.

GS1DWG_R1_00001 (Panjit International Inc.) carries "Not For New Designs" status and is unsuitable for new applications.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the AS1D-HF?

A: Substitution is based on equivalence across nine core parameters: reverse voltage (200 V), average rectified current (1 A), forward voltage (1.1 V @ 1 A), recovery speed (Standard >500ns), package type (DO-214AC, SMA), mounting method (Surface Mount), operating temperature range (-55°C to 150°C), RoHS compliance (ROHS3), and moisture sensitivity level (MSL 1). All listed substitutes meet these criteria.

Q: Can I use a part with different packaging format?

A: Yes. The AS1D-HF is supplied in Tape & Reel format. Substitutes available in Cut Tape & Digi-Reel® format (such as S1D-HF, S1D-E3/5AT, and S1D) are electrically equivalent and mechanically compatible. Packaging format selection depends on assembly equipment and procurement requirements, not electrical performance.

Q: What is the difference between S1DHE3_A/I and S1DHE3_A/H?

A: Both parts are electrically identical with 200 V reverse voltage, 1 A current rating, and 1.1 V forward voltage. Both carry AEC-Q101 automotive qualification and Active status. The primary difference is inventory availability: S1DHE3_A/I has 6,218 pieces in stock, while S1DHE3_A/H has 2,900 pieces.

Q: Why is CS1D-E3/I listed if it is Obsolete?

A: CS1D-E3/I is included for reference purposes in existing designs that may currently use this part. However, it is classified as Obsolete and must not be selected for new designs. Transition to an Active substitute is required.

Q: What does "Not For New Designs" mean for GS1DWG_R1_00001?

A: This designation indicates the manufacturer has discontinued active support for new applications. While the part may still be available in inventory (2,176 pieces), it should not be incorporated into new product designs. Active alternatives such as GS1D_R1_00001 should be used instead.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the AS1D-HF specification.

Q: What is the significance of reverse recovery time (trr) variations?

A: Reverse recovery time is provided for certain substitutes (1.5 µs to 1.8 µs) but is not specified for the AS1D-HF. This parameter does not disqualify substitution because the primary speed specification (Standard Recovery >500ns, > 200mA) is maintained across all parts. Variations in trr reflect manufacturing differences between suppliers but do not affect functional compatibility in standard rectification applications.

Q: Can I substitute based on reverse leakage current differences?

A: Reverse leakage current varies among substitutes (1 µA to 5 µA @ 200 V) but remains within acceptable ranges for general-purpose rectification. The AS1D-HF specifies 5 µA, while most substitutes specify 1 µA. Lower leakage current in substitutes represents improved performance and does not prevent substitution.

Q: Which substitute has the highest inventory availability?

A: S1D-E3/61T (Vishay General Semiconductor - Diodes Division) has 126,100 pieces in stock, providing the greatest supply security for high-volume applications.

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