RB411D-TP Equivalent & Substitute Parts

Part Overview

The RB411D-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 20 V DC reverse voltage and 500 mA average rectified current in a surface mount SOT-23 package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within defined parameter ranges suitable for the same application circuit requirements.

Substiute Parts

RB411D-TP

Micro Commercial CoIn Stock: 941RB411D-TP Datasheet

Current PartRFQ

RB400DFHT146

Rohm SemiconductorIn Stock: 1131RB400DFHT146 Datasheet

SimilarRFQ

ZHCS500TA

Diodes IncorporatedIn Stock: 17481ZHCS500TA Datasheet

SimilarRFQ

RB411DT146

Rohm SemiconductorIn Stock: 19389RB411DT146 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RB411D-TP is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Technology: Schottky diode
• Package / Case: TO-236-3, SC-59, SOT-23-3 (physical and electrical compatibility)
• Mounting Type: Surface Mount
• Current - Average Rectified (Io): 500 mA minimum
• Operating Temperature - Junction (Max): 125°C minimum
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Voltage Rating Substitution Logic:

• Parametric Equivalent: Voltage - DC Reverse (Vr) (Max) = 20 V (identical specification)
• Functional Substitute: Voltage - DC Reverse (Vr) (Max) ≥ 20 V (higher voltage rating acceptable for same application)

Forward Voltage Substitution Logic:

• Parametric Equivalent: Voltage - Forward (Vf) (Max) @ If = 500 mV @ 500 mA (identical specification)
• Functional Substitute: Voltage - Forward (Vf) (Max) @ If ≤ 550 mV @ 500 mA (minor variation acceptable within circuit design margins)

Recovery Speed Substitution Logic:

• All substitutes maintain Fast Recovery ≤ 500 ns, > 200 mA (Io) classification

Identified substitutes are grouped as follows:

Parametric Equivalent (Identical Electrical Specifications):

• RB411DT146 (Rohm Semiconductor): Identical 20 V, 500 mA, 500 mV forward voltage specifications; Active product status; SMD3 package variant

Functional Substitutes (Higher Voltage Rating, Compatible Performance):

• RB400DFHT146 (Rohm Semiconductor): 40 V reverse voltage rating; 500 mA current; 550 mV forward voltage; Not For New Designs status
• ZHCS500TA (Diodes Incorporated): 40 V reverse voltage rating; 500 mA current; 550 mV forward voltage; Active product status

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Parametric Equivalent):

RB411DT146 is the parametric equivalent to RB411D-TP, maintaining identical electrical specifications: 20 V reverse voltage, 500 mA current rating, and 500 mV forward voltage drop. This part is manufactured by Rohm Semiconductor with Active product status, ensuring long-term availability and supply chain continuity. RB411DT146 is ROHS3 compliant and carries MSL 1 (Unlimited) classification, matching the environmental and handling requirements of the original part. The SMD3 package designation is functionally equivalent to the SOT-23 package of the main part within the TO-236-3 / SC-59 physical standard.

For Functional Substitution (Higher Voltage Rating):

ZHCS500TA (Diodes Incorporated) is recommended as the primary functional substitute when higher reverse voltage rating is acceptable within circuit design parameters. This part maintains 500 mA current rating and 550 mV forward voltage specification, with Active product status ensuring availability. ZHCS500TA provides 40 V reverse voltage rating, offering additional design margin for applications with voltage transient protection requirements. The part is ROHS3 compliant, MSL 1 (Unlimited), and supplied in SOT-23-3 package format.

RB400DFHT146 (Rohm Semiconductor) is an alternative functional substitute with identical 40 V reverse voltage and 500 mA current specifications. However, this part carries Not For New Designs product status, limiting its suitability for new development projects. RB400DFHT146 is appropriate only for legacy system maintenance and repair applications where existing inventory or design documentation specifies this part number.

Compliance and Certification:

All identified substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity classification, ensuring compatibility with standard PCB assembly and storage procedures. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0070, maintaining consistent regulatory and tariff classification with the original RB411D-TP.

Frequently Asked Questions (FAQ)

Q: Can RB411DT146 be used as a direct replacement for RB411D-TP?

A: Yes. RB411DT146 is a parametric equivalent with identical electrical specifications: 20 V reverse voltage, 500 mA current rating, 500 mV forward voltage drop, and Fast Recovery speed classification. Both parts use the TO-236-3 / SC-59 / SOT-23-3 package standard. The SMD3 package designation of RB411DT146 is functionally equivalent to the SOT-23 designation of RB411D-TP within this physical standard. RB411DT146 has Active product status, ensuring supply continuity.

Q: What is the difference between parametric equivalents and functional substitutes?

A: Parametric equivalents maintain identical electrical specifications across all critical parameters. RB411DT146 is a parametric equivalent to RB411D-TP, with matching 20 V reverse voltage and 500 mV forward voltage ratings. Functional substitutes offer compatible performance with variations in non-critical parameters. ZHCS500TA and RB400DFHT146 are functional substitutes with higher 40 V reverse voltage ratings, suitable for applications where this increased rating does not conflict with circuit design requirements.

Q: Can I use ZHCS500TA or RB400DFHT146 in place of RB411D-TP?

A: Yes, both parts are functionally compatible substitutes. ZHCS500TA and RB400DFHT146 maintain the 500 mA current rating and Fast Recovery speed classification. The 40 V reverse voltage rating is higher than the 20 V specification of RB411D-TP, which is acceptable in most applications. Forward voltage is 550 mV compared to 500 mV of the original part, a 50 mV difference that typically falls within circuit design margins. Circuit analysis is required to confirm that the higher voltage rating and forward voltage variation do not affect system performance.

Q: What is the difference between ZHCS500TA and RB400DFHT146?

A: Both parts share identical electrical ratings: 40 V reverse voltage, 500 mA current, and 550 mV forward voltage. The primary difference is product status. ZHCS500TA (Diodes Incorporated) has Active product status, ensuring ongoing availability for new designs and long-term supply. RB400DFHT146 (Rohm Semiconductor) has Not For New Designs status, limiting its use to legacy system maintenance and repair. ZHCS500TA is the preferred choice for new development projects.

Q: Are the package designations SOT-23 and SMD3 compatible?

A: Yes. SOT-23 and SMD3 are equivalent package designations within the TO-236-3 / SC-59 physical standard. Both refer to a three-lead surface mount package with identical pin configuration, spacing, and PCB footprint. Parts designated as SOT-23, SOT-23-3, or SMD3 are mechanically and electrically interchangeable within this standard.

Q: Do all substitute parts meet the same compliance requirements as RB411D-TP?

A: Yes. RB411DT146, RB400DFHT146, and ZHCS500TA are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity classification. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0070, matching the regulatory and tariff classification of RB411D-TP.

Q: What is the significance of the reverse leakage current difference between parts?

A: Reverse leakage current is measured at different voltage levels across the parts. RB411D-TP and RB411DT146 specify 30 µA @ 10 V, while ZHCS500TA specifies 40 µA @ 30 V and RB400DFHT146 specifies 50 µA @ 30 V. These measurements are taken at different reference voltages, making direct comparison inappropriate. Leakage current specifications are provided by manufacturers at their specified test conditions and should be evaluated within the context of actual circuit operating voltages.

Q: What is the significance of the capacitance difference between parts?

A: Capacitance values are measured at different reference voltages and frequencies. RB411D-TP and RB411DT146 specify 20 pF @ 10 V, 1 MHz, while ZHCS500TA specifies 20 pF @ 25 V, 1 MHz, and RB400DFHT146 specifies 130 pF @ 0 V, 1 MHz. Capacitance varies with applied voltage in Schottky diodes. These measurements reflect manufacturer test conditions and should be evaluated within the context of actual circuit operating conditions and frequency requirements.

Q: Is RB411DT146 available in the same packaging format as RB411D-TP?

A: RB411D-TP is supplied in Tape & Reel (TR) packaging, while RB411DT146 is supplied in Cut Tape (CT) & Digi-Reel® packaging. Both packaging formats are standard for surface mount components and are compatible with automated PCB assembly equipment. The physical component package (SOT-23 / SMD3) is identical; only the supply format differs.