RB400D-TP Equivalent & Substitute Parts

Part Overview

The RB400D-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 500 mA average rectified current in a surface mount SOT-23 package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing production and maintenance applications. Equivalent parts maintain identical electrical and mechanical specifications, enabling direct replacement without circuit redesign.

Substiute Parts

RB400D-TP

Micro Commercial CoIn Stock: 1187RB400D-TP Datasheet

Current PartRFQ

BAT400D-7-F

Diodes IncorporatedIn Stock: 23347BAT400D-7-F Datasheet

SimilarRFQ

CDBT0540-G

Comchip TechnologyIn Stock: 765CDBT0540-G Datasheet

Parametric EquivalentRFQ

RB400DFHT146

Rohm SemiconductorIn Stock: 1131RB400DFHT146 Datasheet

Parametric EquivalentRFQ

RB400DT146

Rohm SemiconductorIn Stock: 84779RB400DT146 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RB400D-TP is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 500 mA
• Voltage - Forward (Vf) (Max) @ If: 550 mV @ 500 mA
• Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
• Current - Reverse Leakage @ Vr: 50 µA @ 30 V
• Capacitance @ Vr, F: 125 pF @ 0 V, 1 MHz

Mechanical Specifications:

• Package / Case: TO-236-3, SC-59, SOT-23-3
• Mounting Type: Surface Mount
• Operating Temperature - Junction (Max): 125°C

Compliance Requirements:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts maintain these specifications within the allowed tolerances for direct circuit replacement.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: RB400DT146

The RB400DT146 manufactured by Rohm Semiconductor is the preferred substitute for the obsolete RB400D-TP. This part maintains full electrical and mechanical equivalence across all critical parameters, including reverse voltage, rectified current, forward voltage drop, and switching speed. The RB400DT146 carries Active product status, ensuring long-term availability and supply chain continuity. Inventory availability is substantial at 84,740 pieces. The part is ROHS3 compliant and carries MSL 1 rating, matching the original specification.

Secondary Recommendation: BAT400D-7-F

The BAT400D-7-F from Diodes Incorporated provides equivalent electrical performance and is classified as Active. This part is supplied in Tape & Reel packaging and maintains all specified electrical parameters. With 23,300 pieces in inventory, this option offers robust supply availability. The part is ROHS3 compliant and carries MSL 1 rating.

Alternative Recommendation: CDBT0540-G

The CDBT0540-G from Comchip Technology is a parametric equivalent with Active product status. This part maintains all critical electrical specifications and is suitable for direct substitution. Inventory availability is lower at 656 pieces. The part is ROHS3 compliant and carries MSL 1 rating.

Not Recommended for New Designs: RB400DFHT146

The RB400DFHT146 from Rohm Semiconductor carries a "Not For New Designs" status and should not be selected for new circuit implementations. While this part maintains electrical equivalence and includes automotive-grade qualification (AEC-Q101), its restricted product status indicates limited future support. This part is suitable only for maintenance and repair of existing designs.

Frequently Asked Questions (FAQ)

Q: Can the RB400DT146 be used as a direct replacement for the RB400D-TP?

A: Yes. The RB400DT146 maintains identical electrical specifications across all critical parameters: 40 V reverse voltage, 500 mA average rectified current, 550 mV forward voltage drop at 500 mA, and fast recovery switching characteristics. Both parts use the same SOT-23-3 package and surface mount technology. No circuit modifications are required.

Q: What is the difference between the RB400DFHT146 and RB400DT146?

A: Both parts are manufactured by Rohm Semiconductor and maintain equivalent electrical specifications. The primary difference is product status: RB400DFHT146 is classified as "Not For New Designs," while RB400DT146 is Active. The RB400DFHT146 includes automotive-grade qualification (AEC-Q101) and specifies reverse recovery time (7.35 ns) and slightly higher capacitance (130 pF). For new designs, RB400DT146 is the appropriate selection.

Q: Are all substitute parts available in the same packaging format?

A: The substitute parts are available in different packaging formats. RB400DT146 and RB400DFHT146 are supplied in Cut Tape (CT) & Digi-Reel format. BAT400D-7-F and CDBT0540-G are supplied in Tape & Reel (TR) format. All parts use the same SOT-23-3 component package, ensuring mechanical compatibility on printed circuit boards.

Q: Do all substitute parts meet RoHS compliance requirements?

A: Yes. All identified substitute parts—RB400DT146, BAT400D-7-F, CDBT0540-G, and RB400DFHT146—are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original RB400D-TP specification.

Q: What is the capacitance difference between RB400DFHT146 and other substitutes?

A: The RB400DFHT146 specifies 130 pF capacitance at 0 V and 1 MHz, while the RB400D-TP, RB400DT146, BAT400D-7-F, and CDBT0540-G all specify 125 pF under the same conditions. This 5 pF difference is within typical manufacturing tolerances for Schottky diodes and does not affect circuit functionality in standard rectification applications.

Q: Which substitute part offers the best supply availability?

A: The RB400DT146 offers the highest inventory level at 84,740 pieces, followed by BAT400D-7-F at 23,300 pieces. Both parts carry Active product status, ensuring continued availability. CDBT0540-G has lower inventory at 656 pieces.