DB104ST-HF Bridge Rectifier Equivalent & Substitute Parts

Part Overview

The DB104ST-HF is a single-phase bridge rectifier manufactured by Comchip Technology, designed for 400 V peak reverse voltage applications with 1 A average rectified current capacity. This component is classified as obsolete, indicating discontinuation from active production. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this bridge rectifier topology.

Substiute Parts

DB104ST-HF

Comchip TechnologyIn Stock: 740DB104ST-HF Datasheet

Current PartRFQ

DB104S-HF

Comchip TechnologyIn Stock: 1011DB104S-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DB104ST-HF is determined by electrical and mechanical parameter equivalence across the following criteria:

Primary Substitution Criteria:

• Diode Type: Single Phase bridge rectifier configuration
• Voltage Rating: 400 V peak reverse voltage (Vrrm)
• Current Rating: 1 A average rectified current (Io)
• Forward Voltage: 1.1 V maximum at 1 A forward current
• Reverse Leakage: 10 µA maximum at 400 V reverse voltage
• Temperature Range: -55°C to 150°C operating junction temperature
• Mounting Technology: Surface mount assembly
• Package Type: 4-SMD, Gull Wing configuration (DBS package)

The primary manufacturer-recommended substitute is DB104S-HF, which maintains identical electrical specifications and package configuration while offering active product status. Secondary substitutes (DF04S-E3/45, DB104S-G, DF04S-G) are qualified alternatives that meet the same electrical and mechanical requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: DB104S-HF

The DB104S-HF is the manufacturer-recommended substitute for the obsolete DB104ST-HF. This part maintains complete electrical and mechanical equivalence across all specified parameters while offering active product status. Selection of DB104S-HF ensures continued availability, supply chain stability, and manufacturer support for new production runs and field replacements.

Secondary Alternatives: DF04S-E3/45, DB104S-G, DF04S-G

These substitute parts meet identical electrical specifications and package requirements. Selection among these alternatives is appropriate when DB104S-HF availability is constrained or when specific supplier relationships dictate component sourcing. All secondary alternatives maintain compliance with the same electrical performance envelope and thermal operating range.

Compliance and Certification

All substitute parts carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications, ensuring regulatory equivalence for export and tariff purposes.

Frequently Asked Questions (FAQ)

Q: Can DB104S-HF be used as a direct replacement for DB104ST-HF?

A: Yes. DB104S-HF is electrically and mechanically equivalent to DB104ST-HF across all specified parameters, including voltage rating (400 V), current rating (1 A), forward voltage (1.1 V @ 1 A), reverse leakage (10 µA @ 400 V), operating temperature range (-55°C to 150°C), and package configuration (4-SMD, Gull Wing DBS). The primary difference is product status: DB104S-HF is active while DB104ST-HF is obsolete.

Q: Are the secondary substitute parts (DF04S-E3/45, DB104S-G, DF04S-G) interchangeable with DB104ST-HF?

A: Yes. All secondary substitute parts meet the same electrical and mechanical specifications as DB104ST-HF. They are qualified alternatives that maintain identical voltage, current, forward voltage, reverse leakage, temperature range, and package characteristics.

Q: What is the difference between DB104S-HF and DB104S-G?

A: Both parts are electrically equivalent with identical specifications for voltage rating, current rating, forward voltage, reverse leakage, and operating temperature. The difference lies in product designation; both are active alternatives to the obsolete DB104ST-HF.

Q: Does the package type remain the same across all substitutes?

A: Yes. All substitute parts utilize the same 4-SMD, Gull Wing package configuration (DBS supplier device package), ensuring PCB layout and assembly process compatibility without modification.

Q: Are there any thermal or environmental differences between the original and substitute parts?

A: No. All parts maintain identical operating temperature range specifications (-55°C to 150°C junction temperature), ensuring equivalent thermal performance and environmental suitability.

Q: What is the inventory status of substitute parts?

A: DB104S-HF has 997 pieces in stock as new original inventory. Secondary substitutes maintain active product status with manufacturer availability. Specific inventory levels for secondary alternatives should be confirmed through component suppliers.