DB103ST-HF Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The DB103ST-HF is a single-phase bridge rectifier manufactured by Comchip Technology, rated for 200 V peak reverse voltage and 1 A average rectified current in a 4-SMD surface mount package. This component is classified as obsolete, necessitating identification of equivalent alternatives for ongoing production and repair applications. Substitute parts must maintain identical electrical performance and mechanical compatibility to ensure direct replacement capability.

Key Parameters

Parameter	Value
Diode Type	Single Phase
Technology	Standard
Voltage - Peak Reverse (Max)	200 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A
Current - Reverse Leakage @ Vr	10 µA @ 200 V
Operating Temperature Range	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	4-SMD, Gull Wing

Substitute Part Grouping Explanation

Substitute parts for the DB103ST-HF are qualified based on matching the following critical parameters:

Voltage - Peak Reverse (Max): 200 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1.1 V @ 1 A
Current - Reverse Leakage @ Vr: 10 µA @ 200 V
Operating Temperature Range: -55°C ~ 150°C
Mounting Type: Surface Mount
Package / Case: 4-SMD, Gull Wing

Two substitute parts meet these electrical and mechanical specifications and are identified below.

Parameter Comparison

Parameter	DB103ST-HF (Main)	DB103S-HF (MFR Recommended)	SDB103-TP (Parametric Equivalent)
Manufacturer	Comchip Technology	Comchip Technology	Micro Commercial Co
Product Status	Obsolete	Active	Not For New Designs
Diode Type	Single Phase	Single Phase	Single Phase
Technology	Standard	Standard	Standard
Voltage - Peak Reverse (Max)	200 V	200 V	200 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	1.1 V @ 1 A	1.1 V @ 1 A
Current - Reverse Leakage @ Vr	10 µA @ 200 V	10 µA @ 200 V	10 µA @ 200 V
Operating Temperature Range	-55°C ~ 150°C	-55°C ~ 150°C (TJ)	-55°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, Gull Wing	4-SMD, Gull Wing	4-SMD, Gull Wing
Supplier Device Package	DBS	DBS	SDB-1
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.10.0080	8541.10.0080	8541.10.0080

Engineering Selection Recommendations

DB103S-HF (Manufacturer Recommended Substitute)

The DB103S-HF is the primary substitute for the obsolete DB103ST-HF. Both components are manufactured by Comchip Technology and share identical electrical specifications and package geometry. The DB103S-HF maintains active product status, ensuring continued availability and manufacturing support. This part is suitable for new designs and production applications requiring direct replacement of the DB103ST-HF.

SDB103-TP (Parametric Equivalent)

The SDB103-TP, manufactured by Micro Commercial Co, provides parametric equivalence with identical electrical performance and mechanical compatibility. This part is classified as "Not For New Designs," indicating it is available for legacy system support and repair applications only. The SDB103-TP is supplied in Tape & Reel packaging and carries ROHS3 compliance certification. Selection of this part is appropriate for maintenance and repair of existing systems where the DB103ST-HF is no longer available.

Frequently Asked Questions (FAQ)

Q: Can DB103S-HF directly replace DB103ST-HF in existing designs?

A: Yes. The DB103S-HF provides direct electrical and mechanical compatibility with the DB103ST-HF. Both components share identical voltage ratings (200 V peak reverse), current ratings (1 A average rectified), forward voltage characteristics (1.1 V @ 1 A), reverse leakage specifications (10 µA @ 200 V), operating temperature range (-55°C ~ 150°C), and 4-SMD Gull Wing package geometry.

Q: What is the difference between DB103S-HF and SDB103-TP?

A: Both parts meet identical electrical specifications and package requirements. The primary differences are manufacturer (Comchip Technology versus Micro Commercial Co), product status (Active versus Not For New Designs), and supplier device package designation (DBS versus SDB-1). The DB103S-HF is recommended for new applications, while SDB103-TP is suitable for legacy system support.

Q: Are there packaging differences between these substitutes?

A: The DB103ST-HF and DB103S-HF are supplied in standard packaging. The SDB103-TP is supplied in Tape & Reel (TR) format, which affects handling and assembly processes but does not alter electrical performance or mechanical fit in the 4-SMD Gull Wing package.

Q: Can SDB103-TP be used in new product designs?

A: No. The SDB103-TP is classified as "Not For New Designs." This designation indicates the part is available for repair and legacy system support only. The DB103S-HF is the appropriate selection for new product development.

Q: What compliance certifications apply to these substitutes?

A: All three parts carry EAR99 export classification and HTSUS code 8541.10.0080. The SDB103-TP additionally carries ROHS3 compliance certification and REACH Unaffected status.

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