Equivalent & Substitute Parts for RB521G-40FHT2R

Part Overview

The RB521G-40FHT2R is a Schottky diode manufactured by Rohm Semiconductor, categorized under Diodes, Rectifiers. It features a maximum DC reverse voltage of 40 V, an average rectified current of 100 mA, and is supplied in the VMD2 (SOD-723) surface mount package. Its product status is Obsolete. Identification of substitute models is necessary to ensure continued functional equivalence in existing and new designs, in cases where RB521G-40FHT2R is no longer available.

Key Parameters

Parameter	RB521G-40FHT2R
Manufacturer	Rohm Semiconductor
Category	Diodes, Rectifiers
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	100 mA
Voltage - Forward (Vf) (Max) @ If	610 mV @ 100 mA
Current - Reverse Leakage @ Vr	100 µA @ 40 V
Speed	Small Signal =< 200mA (Io), Any Speed
Grade	Automotive
Qualification	AEC-Q101
Mounting Type	Surface Mount
Package / Case	SOD-723
Supplier Device Package	VMD2
Operating Temperature - Junction	125°C (Max)
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99

Substitute Part Grouping Explanation

The substitute selection for RB521G-40FHT2R is based strictly on matching or exceeding the following key electrical and mechanical parameters:

Schottky diode technology
Maximum DC reverse voltage (Vr) of 40 V
Average rectified current (Io) equal to or higher than 100 mA
Maximum forward voltage (Vf) at specified current not exceeding that of the main part
Automotive grade and AEC-Q101 qualification
Surface mount packaging suitable for automated assembly
RoHS3 compliance and REACH unaffected status
Electrical characteristics including current leakage, forward voltage drop, and operating temperature, within or exceeding the parameters of the referenced part

Only parts that meet these requirements are included as substitutes.

Parameter Comparison

Parameter	RB521G-40FHT2R	RB421DFHT146	RB521SM-40FHT2R
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V
Current - Average Rectified (Io)	100 mA	100 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	610 mV @ 100 mA	550 mV @ 100 mA	540 mV @ 200 mA
Current - Reverse Leakage @ Vr	100 µA @ 40 V	30 µA @ 10 V	90 µA @ 40 V
Grade	Automotive	Automotive	Automotive
Qualification	AEC-Q101	AEC-Q101	AEC-Q101
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-723	TO-236-3, SC-59, SOT-23-3	SC-79, SOD-523
Supplier Device Package	VMD2	SMD3	EMD2
Operating Temperature - Junction	125°C (Max)	125°C	150°C (Max)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99

Engineering Selection Recommendations

RB521G-40FHT2R carries Obsolete product status. Substitute selections such as RB421DFHT146 and RB521SM-40FHT2R are confirmed to hold AEC-Q101 qualification, automotive grade, RoHS3 compliance, and REACH unaffected status. All listed substitute components support a surface mount form factor, are Schottky diodes in the same voltage category, and are manufactured by Rohm Semiconductor. RB521SM-40FHT2R and RB421DFHT146 provide continuity of compliance and qualification required for automotive and regulated applications.

Frequently Asked Questions (FAQ)

Q1: What are the key criteria for selecting a substitute for RB521G-40FHT2R?
A1: Critical criteria are Schottky technology, DC reverse voltage of 40 V, an average rectified current rating of at least 100 mA, automotive grade, AEC-Q101 qualification, surface mount package, and compliance with RoHS3 and REACH.

Q2: Are the package types interchangeable?
A2: Substitute parts use different surface mount package types: SOD-723 (VMD2), TO-236-3/SC-59/SOT-23-3 (SMD3), and SC-79/SOD-523 (EMD2). Compatibility with existing board layouts must be verified per mechanical constraints.

Q3: Do substitute parts maintain equivalent electrical performance?
A3: The listed substitutes meet or exceed the voltage, current, forward voltage, and reverse leakage current parameters as provided for RB521G-40FHT2R.

Q4: Are all substitutes suitable for automotive and high-reliability use?
A4: Yes. Each substitute listed is automotive grade and AEC-Q101 qualified.

Q5: Are there differences in compliance status among the parts listed?
A5: All parts provided are RoHS3 compliant and REACH unaffected, with MSL 1 (Unlimited) and ECCN EAR99.

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