RB705DFHT146 Equivalent & Substitute Parts

Part Overview

The RB705DFHT146 is a Schottky diode array manufactured by Rohm Semiconductor, configured as a 1 Pair Common Cathode arrangement in a Surface Mount TO-236-3 (SOT-23-3) package. This component is rated for 40 V DC reverse voltage with 30 mA average rectified current per diode and features a maximum forward voltage of 370 mV at 1 mA. The part carries automotive-grade qualification (AEC-Q101) and is RoHS3 compliant.

The RB705DFHT146 is designated as "Not For New Designs," indicating that Rohm Semiconductor has discontinued active development for this part number. Identifying equivalent and substitute parts is necessary to support existing designs, facilitate production continuity, and enable migration to active product lines where applicable.

Substiute Parts

RB705DFHT146

Rohm SemiconductorIn Stock: 703RB705DFHT146 Datasheet

Current PartRFQ

BAS40-05-G3-18

Vishay General Semiconductor - Diodes DivisionIn Stock: 1094BAS40-05-G3-18 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RB705DFHT146 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Diode Configuration: 1 Pair Common Cathode
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 40 V minimum
• Package / Case: TO-236-3, SC-59, SOT-23-3
• Mounting Type: Surface Mount

Allowable Variation Parameters:

• Current - Average Rectified (Io) (per Diode): Substitute must equal or exceed 30 mA
• Voltage - Forward (Vf) (Max): Substitute must not exceed the application's forward voltage tolerance
• Operating Temperature - Junction: Substitute must support 125°C maximum
• Compliance: RoHS3 compliance required

The BAS40-05-G3-18 from Vishay General Semiconductor meets all critical matching parameters and exceeds the current rating (200 mA vs. 30 mA), making it a direct electrical and mechanical substitute. The part is in active product status and maintains automotive-grade compliance.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: BAS40-05-G3-18

The BAS40-05-G3-18 is the qualified substitute for the RB705DFHT146. Selection is based on the following engineering criteria:

1. Electrical Compatibility: Both parts share identical reverse voltage rating (40 V), diode configuration (1 Pair Common Cathode), and Schottky technology. The BAS40-05-G3-18 current rating of 200 mA exceeds the RB705DFHT146 requirement of 30 mA, providing design margin without functional degradation.

2. Package Compatibility: Both components use the TO-236-3 (SOT-23-3) Surface Mount package, ensuring mechanical and thermal compatibility with existing PCB layouts and assembly processes.

3. Compliance and Certification: The BAS40-05-G3-18 maintains RoHS3 compliance and automotive-grade qualification, meeting the same regulatory and quality standards as the original part.

4. Product Status: The BAS40-05-G3-18 is in active product status, ensuring long-term availability and supply chain continuity compared to the RB705DFHT146, which is not recommended for new designs.

5. Temperature Rating: Both parts support a maximum junction temperature of 125°C, maintaining thermal performance equivalence.

Frequently Asked Questions (FAQ)

Q: Can the BAS40-05-G3-18 be used as a direct replacement for the RB705DFHT146 in existing designs?

A: Yes. The BAS40-05-G3-18 is electrically and mechanically compatible with the RB705DFHT146. Both parts share the same reverse voltage rating (40 V), diode configuration (1 Pair Common Cathode), Schottky technology, and SOT-23-3 package. The higher current rating of the BAS40-05-G3-18 (200 mA vs. 30 mA) does not create compatibility issues and provides additional design margin.

Q: Are there any forward voltage differences between the RB705DFHT146 and BAS40-05-G3-18?

A: The forward voltage specifications are measured at different test conditions. The RB705DFHT146 specifies 370 mV maximum at 1 mA, while the BAS40-05-G3-18 specifies 1 V maximum at 40 mA. These different test points reflect the different current ratings of each part. For applications operating at low currents (below 1 mA), the RB705DFHT146 specification applies to its design. The BAS40-05-G3-18 is characterized at higher currents and will exhibit lower forward voltage at equivalent low-current operating points due to Schottky diode characteristics.

Q: Do both parts meet automotive qualification requirements?

A: The RB705DFHT146 carries AEC-Q101 automotive qualification. The BAS40-05-G3-18 is specified as an automotive-grade component. Both parts are RoHS3 compliant and suitable for automotive applications.

Q: What is the package compatibility between these parts?

A: Both the RB705DFHT146 and BAS40-05-G3-18 use the TO-236-3 (SC-59, SOT-23-3) Surface Mount package. Pin configuration and footprint are identical, allowing direct PCB substitution without layout modifications.

Q: Why is the RB705DFHT146 marked as "Not For New Designs"?

A: The "Not For New Designs" designation indicates that Rohm Semiconductor has discontinued active development and support for this part number. This status typically reflects product line consolidation or transition to newer alternatives. For new designs and ongoing production, the BAS40-05-G3-18 is the recommended active alternative.

Q: Are there any moisture sensitivity or handling differences?

A: Both parts carry Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly. Standard component handling procedures apply to both parts.