RB751G-40-TP Equivalent & Substitute Parts

Part Overview

The RB751G-40-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 30V DC reverse voltage and 30mA average rectified current in a surface mount SOD-723 package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1) and is suitable for small signal rectification applications requiring low forward voltage drop characteristics.

Substiute Parts

RB751G-40-TP

Micro Commercial CoIn Stock: 2216RB751G-40-TP Datasheet

Current PartRFQ

CDBP00340-G

Comchip TechnologyIn Stock: 1083CDBP00340-G Datasheet

DirectRFQ

RB751SM-40T2R

Rohm SemiconductorIn Stock: 301177RB751SM-40T2R Datasheet

UpgradeRFQ

CDBER00340

Comchip TechnologyIn Stock: 818CDBER00340 Datasheet

SimilarRFQ

RB751S40T1G

onsemiIn Stock: 95231RB751S40T1G Datasheet

SimilarRFQ

SDM03U40-7

Diodes IncorporatedIn Stock: 205144SDM03U40-7 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RB751G-40-TP is determined by the following critical parameters: Schottky technology, 30V maximum reverse voltage rating, 30mA average rectified current, 370mV maximum forward voltage at 1mA, 500nA reverse leakage current at 30V, and surface mount mounting type. Package compatibility is a secondary consideration; parts with different package codes (SOD-723, SOD-523, SC-79, 0503) may be substituted if electrical specifications remain within tolerance and board layout permits physical accommodation.

Substitute parts are grouped into three categories:

Direct Equivalent (CDBP00340-G): Identical electrical specifications and SOD-723 package. Active product status with full compliance certifications.

Upgrade Substitute (RB751SM-40T2R): Identical electrical specifications with enhanced maximum junction temperature (150°C vs. 125°C). Different package (SC-79) requires board layout verification. Active product status.

Similar Substitutes (CDBER00340, RB751S40T1G, SDM03U40-7): Maintain core electrical parameters (30V, 30mA, 370mV Vf, 500nA leakage) with minor variations in package, capacitance, or junction temperature range. All active products with full compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required): CDBP00340-G is the primary direct equivalent. This part maintains identical electrical specifications, forward voltage characteristics, reverse leakage current, and capacitance. The SOD-723 package matches the original footprint. Active product status ensures long-term availability and supply chain stability. RoHS3 compliance and MSL 1 rating are maintained.

For Enhanced Thermal Performance: RB751SM-40T2R offers a 25°C higher maximum junction temperature (150°C vs. 125°C) while maintaining all electrical specifications. This part requires board layout verification due to SC-79 package differences from the original SOD-723. Active product status with robust supply availability (301,100 units in stock). Suitable for applications with elevated ambient or junction temperature constraints.

For Voltage Margin Applications: CDBER00340 provides 40V reverse voltage rating (10V higher than the original 30V specification) with identical current and forward voltage ratings. This part is suitable for designs requiring additional voltage headroom. Package change to 0503 (1308 Metric) requires board layout accommodation. Reverse leakage increases to 1µA at 40V, which may impact low-power applications.

For Package Flexibility: RB751S40T1G and SDM03U40-7 maintain 30V/30mA specifications with SOD-523 package options. Both parts are active with high inventory levels. RB751S40T1G offers extended operating temperature range (-55°C to 150°C). SDM03U40-7 provides standard operating range (-40°C to 125°C). Package migration from SOD-723 to SOD-523 requires board layout verification.

All substitute parts carry RoHS3 compliance, MSL 1 rating, and REACH unaffected status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can CDBP00340-G be used as a direct drop-in replacement for RB751G-40-TP? A: Yes. CDBP00340-G maintains identical electrical specifications (30V, 30mA, 370mV Vf, 500nA leakage) and SOD-723 package. No design changes are required. The part is active with established supply availability.

Q: What is the primary advantage of RB751SM-40T2R over the original RB751G-40-TP? A: RB751SM-40T2R provides a maximum junction temperature of 150°C compared to 125°C for the original part. All electrical specifications remain identical. This upgrade is beneficial for applications operating at elevated temperatures. Board layout verification is required due to SC-79 package differences.

Q: Why does CDBER00340 have a 40V rating instead of 30V? A: CDBER00340 is rated for 40V maximum reverse voltage, providing 10V additional voltage margin. This part is suitable for designs requiring higher voltage headroom while maintaining the same 30mA current rating and 370mV forward voltage. The 0503 package differs from the original SOD-723, requiring board layout accommodation.

Q: Are there package compatibility issues when substituting SOD-723 with SOD-523? A: Yes. SOD-523 and SOD-723 are different package footprints. RB751S40T1G and SDM03U40-7 use SOD-523 packages and require board layout verification before implementation. Physical dimensions and pad layouts differ between these packages.

Q: Do all substitute parts meet RoHS3 and MSL requirements? A: Yes. All listed substitute parts (CDBP00340-G, RB751SM-40T2R, CDBER00340, RB751S40T1G, SDM03U40-7) are RoHS3 compliant with MSL 1 (unlimited) rating, matching the original RB751G-40-TP compliance profile.

Q: What is the difference in reverse leakage current between the main part and CDBER00340? A: The original RB751G-40-TP has 500nA reverse leakage at 30V. CDBER00340 has 1µA reverse leakage at 40V. This higher leakage current may impact low-power or high-impedance circuit applications. Verify leakage specifications against circuit requirements before selection.

Q: Which substitute part has the widest operating temperature range? A: RB751S40T1G offers the widest operating temperature range (-55°C to 150°C) compared to the original part's maximum junction temperature of 125°C. This extended range is suitable for military, aerospace, or extreme environment applications.

Q: Can SDM03U40-7 be used in place of RB751G-40-TP without circuit modifications? A: SDM03U40-7 maintains identical electrical specifications (30V, 30mA, 370mV Vf, 500nA leakage) but uses SOD-523 package instead of SOD-723. Board layout changes are required. Electrical circuit operation remains unchanged.

Q: What is the inventory status of substitute parts? A: CDBP00340-G has 1,003 units available. RB751SM-40T2R has 301,100 units available. CDBER00340 has 736 units available. RB751S40T1G has 95,213 units available. SDM03U40-7 has 205,100 units available. All parts are active products with established supply chains.