RB751CS-40T2R Equivalent & Substitute Parts Reference

Part Overview

RB751CS-40T2R is a Schottky diode from Rohm Semiconductor in the Diodes, Rectifiers category. It features a maximum reverse voltage of 30 V, a forward current of 30mA, and is housed in a VMN2 (SOD-923) surface-mount package. The product is classified as "Not For New Designs," indicating it is not recommended for future design projects or mass production. Therefore, it is necessary to identify alternative models that provide continuity in applications previously utilizing RB751CS-40T2R, strictly matching key electrical and mechanical parameters.

Key Parameters

Parameter	Value
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	30mA
Voltage - Forward (Vf) (Max) @ If	370 mV @ 1 mA
Current - Reverse Leakage @ Vr	500 nA @ 30 V
Capacitance @ Vr, F	2pF @ 1V, 1MHz
Speed	Small Signal =< 200mA (Io), Any Speed
Mounting Type	Surface Mount
Package / Case	2-SMD, Flat Lead
Supplier Device Package	VMN2 (SOD-923)
Operating Temperature - Junction	125°C (Max)
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are strictly identified based on matching or exceeding the following key parameters: Schottky technology, maximum reverse voltage, average rectified current, forward voltage at specified test current, reverse leakage at maximum voltage, capacitance, surface-mount configuration, package outline, operating temperature range, and compliance statuses. Only parts meeting these requirements are listed as validated equivalents.

Parameter Comparison

Parameter	Main Part RB751CS-40T2R	Substitute 1 RB751CM-40T2R	Substitute 2 RB751CS-40FHT2RA	Substitute 3 RB751CS40,315
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor	Nexperia USA Inc.
Technology	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	40 V
Current - Average Rectified (Io)	30mA	30mA	30mA	120mA
Voltage - Forward (Vf) (Max) @ If	370 mV @ 1 mA	370 mV @ 1 mA	370 mV @ 1 mA	370 mV @ 1 mA
Current - Reverse Leakage @ Vr	500 nA @ 30 V	500 nA @ 30 V	500 nA @ 30 V	500 nA @ 30 V
Capacitance @ Vr, F	2pF @ 1V, 1MHz	-	2pF @ 1V, 1MHz	2pF @ 1V, 1MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD, Flat Lead	2-SMD, Flat Lead	2-SMD, Flat Lead	SOD-882
Supplier Device Package	VMN2 (SOD-923)	VMN2M (SOD-923)	VMN2 (SOD-923)	DFN1006-2
Operating Temperature - Junction	125°C (Max)	125°C (Max)	125°C (Max)	150°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

RB751CM-40T2R is ROHS3 Compliant and MSL 1 (Unlimited), matching all compliance requirements of RB751CS-40T2R. Product status is Active.
RB751CS-40FHT2RA is ROHS3 Compliant and MSL 1 (Unlimited), meeting all compliance and quality grades, with added automotive grade (AEC-Q101) certification. Product status is Active.
RB751CS40,315 is ROHS3 Compliant, MSL 1 (Unlimited), and includes automotive (AEC-Q100) qualification. Operating temperature is higher. Product status is Active.

Parts listed as "Active" and meeting the same compliance standards are prioritized for continuity in ongoing designs.

Frequently Asked Questions (FAQ)

Q1: What are the main parameters that must match for substituting RB751CS-40T2R?
A1: Substitute diodes must match technology type (Schottky), maximum reverse voltage, average rectified current, forward voltage at specified current, reverse leakage current, capacitance, package dimensions, mounting type, and compliance certifications.

Q2: Are the packaging and mounting types exactly the same?
A2: RB751CM-40T2R and RB751CS-40FHT2RA share the same 2-SMD, Flat Lead/VMN2 (SOD-923) package and surface-mount type as RB751CS-40T2R. RB751CS40,315 uses the SOD-882/DFN1006-2 package.

Q3: How does automotive qualification affect substitution choices?
A3: RB751CS-40FHT2RA and RB751CS40,315 include automotive (AEC-Q) qualification, which is relevant if a certified grade is required.

Q4: How do compliance and MSL ratings impact selection?
A4: All substitutes are ROHS3 compliant and rated MSL 1 (Unlimited), matching the original part’s compliance and moisture sensitivity requirements.

Q5: Is reverse voltage or forward current ever higher in the substitutes?
A5: RB751CS40,315 offers a higher maximum reverse voltage (40 V) and higher average rectified current (120mA) while maintaining the same forward voltage rating as RB751CS-40T2R.

Q6: Are all these diodes suitable for surface-mount applications?
A6: All listed substitutes are designed for surface-mount applications. Check package and footprint compatibility.

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