RB511SM-30FHT2R Equivalent & Substitute Parts

Part Overview

The RB511SM-30FHT2R is a Schottky rectifier diode manufactured by Rohm Semiconductor, rated for 30 V DC reverse voltage and 100 mA average rectified current in a surface mount EMD2 package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original component is no longer available or procurement is limited.

Key Parameters

Parameter	Value
Manufacturer Part Number	RB511SM-30FHT2R
Manufacturer	Rohm Semiconductor
Category	Diodes, Rectifiers
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	100 mA
Voltage - Forward (Vf) (Max) @ If	370 mV @ 10 mA
Current - Reverse Leakage @ Vr	7 µA @ 10 V
Package / Case	SC-79, SOD-523
Mounting Type	Surface Mount
Operating Temperature - Junction (Max)	125°C
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RB511SM-30FHT2R is determined by the following critical parameters:

Parametric Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 30 V minimum
Current - Average Rectified (Io): 100 mA minimum
Technology: Schottky
Package / Case: SC-79 or SOD-523
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Parametric Equivalent: RB511SM-30T2R matches all electrical specifications and packaging requirements of the main part, with identical voltage, current, and forward voltage characteristics. This part is manufactured by Rohm Semiconductor and maintains Active product status.

Similar Substitutes: The parts RB521S30T5G, BAT54TS-AU_R1_000A1, and RB521S30-AU_R1_000A1 are classified as similar substitutes. These parts maintain the 30 V reverse voltage rating and surface mount SOD-523 packaging but feature increased current ratings (200 mA) and different forward voltage characteristics. These substitutes are suitable for applications where the higher current capacity does not create thermal or circuit design conflicts.

Parameter Comparison

Parameter	RB511SM-30FHT2R (Main)	RB511SM-30T2R (Parametric Equivalent)	RB521S30T5G (Similar)	BAT54TS-AU_R1_000A1 (Similar)	RB521S30-AU_R1_000A1 (Similar)
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	onsemi	Panjit International Inc.	Panjit International Inc.
Product Status	Not For New Designs	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	100 mA	100 mA	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	370 mV @ 10 mA	370 mV @ 10 mA	500 mV @ 200 mA	600 mV @ 100 mA	500 mV @ 200 mA
Current - Reverse Leakage @ Vr	7 µA @ 10 V	7 µA @ 10 V	30 µA @ 10 V	2 µA @ 30 V	100 µA @ 30 V
Package / Case	SC-79, SOD-523	SC-79, SOD-523	SC-79, SOD-523	SC-79, SOD-523	SC-79, SOD-523
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	125°C (Max)	125°C (Max)	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Grade	Automotive	Not specified	Not specified	Automotive	Automotive
Qualification	AEC-Q101	Not specified	Not specified	AEC-Q101	AEC-Q101
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Selection: RB511SM-30T2R

The RB511SM-30T2R is the recommended parametric equivalent for direct replacement of the RB511SM-30FHT2R. This part maintains identical electrical specifications including 30 V reverse voltage, 100 mA average rectified current, and 370 mV forward voltage at 10 mA. Both parts are manufactured by Rohm Semiconductor and packaged in SC-79/SOD-523 surface mount configurations. The RB511SM-30T2R holds Active product status, ensuring ongoing availability and supply chain continuity. Current inventory of 16,300 units supports procurement requirements.

Secondary Selection: RB521S30T5G (onsemi)

The RB521S30T5G is suitable for applications where increased current capacity (200 mA) is acceptable and does not create thermal or design conflicts. This part maintains the 30 V reverse voltage rating and surface mount SOD-523 packaging. The onsemi part offers extended operating temperature range (-55°C to 125°C) compared to the main part's maximum junction temperature specification. High inventory availability (50,145 units) supports rapid procurement. Forward voltage at 200 mA is 500 mV, which differs from the main part's 370 mV at 10 mA and must be evaluated for circuit impact.

Tertiary Selection: BAT54TS-AU_R1_000A1 (Panjit International Inc.)

The BAT54TS-AU_R1_000A1 maintains 30 V reverse voltage and surface mount SOD-523 packaging with 200 mA current rating. This part carries Automotive grade and AEC-Q101 qualification, matching the main part's compliance profile. Forward voltage is 600 mV at 100 mA, representing the highest forward voltage among substitute options. Reverse leakage is 2 µA at 30 V, the lowest among all listed parts. Inventory of 21,003 units supports availability.

Quaternary Selection: RB521S30-AU_R1_000A1 (Panjit International Inc.)

The RB521S30-AU_R1_000A1 provides 30 V reverse voltage and 200 mA current capacity in surface mount SOD-523 packaging. This part carries Automotive grade and AEC-Q101 qualification. Forward voltage is 500 mV at 200 mA. Reverse leakage is 100 µA at 30 V, the highest among all listed parts. Inventory of 19,676 units supports procurement.

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can RB511SM-30T2R be used as a direct replacement for RB511SM-30FHT2R?

A: Yes. The RB511SM-30T2R is a parametric equivalent with identical electrical specifications: 30 V reverse voltage, 100 mA average rectified current, 370 mV forward voltage at 10 mA, and 7 µA reverse leakage at 10 V. Both parts use SC-79/SOD-523 surface mount packaging and are ROHS3 compliant. The primary difference is product status: RB511SM-30T2R is Active, while RB511SM-30FHT2R is Not For New Designs.

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

A: Parametric equivalents match all critical electrical specifications of the main part. The RB511SM-30T2R is a parametric equivalent with identical voltage, current, and forward voltage ratings. Similar substitutes maintain the same reverse voltage and package type but feature different current ratings or forward voltage characteristics. The RB521S30T5G, BAT54TS-AU_R1_000A1, and RB521S30-AU_R1_000A1 are similar substitutes with 200 mA current ratings versus the main part's 100 mA.

Q: Can I use a 200 mA rated diode in place of a 100 mA rated diode?

A: Yes, provided the application circuit does not require the specific forward voltage or reverse leakage characteristics of the original part. A higher current rating provides design margin and does not create functional incompatibility. However, forward voltage differences must be evaluated: the main part specifies 370 mV at 10 mA, while similar substitutes range from 500 mV to 600 mV at higher current levels. Circuit performance may be affected if forward voltage drop is critical to system operation.

Q: Are all substitute parts automotive qualified?

A: The main part RB511SM-30FHT2R carries Automotive grade and AEC-Q101 qualification. Among substitutes, BAT54TS-AU_R1_000A1 and RB521S30-AU_R1_000A1 also carry Automotive grade and AEC-Q101 qualification. RB511SM-30T2R and RB521S30T5G do not specify automotive grade or AEC-Q101 qualification in the provided data. For automotive applications requiring AEC-Q101 compliance, BAT54TS-AU_R1_000A1 or RB521S30-AU_R1_000A1 are appropriate selections.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) & Digi-Reel® packaging is supplied in individual cut segments on tape, suitable for lower-volume orders and manual assembly. Tape & Reel (TR) packaging supplies components on continuous reel format, optimized for high-volume automated assembly. Both formats contain the same component in identical SC-79/SOD-523 packages. Selection depends on procurement volume and assembly process requirements.

Q: How do reverse leakage specifications differ among substitutes?

A: Reverse leakage varies significantly: RB511SM-30FHT2R specifies 7 µA at 10 V, RB511SM-30T2R specifies 7 µA at 10 V, RB521S30T5G specifies 30 µA at 10 V, BAT54TS-AU_R1_000A1 specifies 2 µA at 30 V, and RB521S30-AU_R1_000A1 specifies 100 µA at 30 V. Lower reverse leakage is preferable in high-impedance circuits. BAT54TS-AU_R1_000A1 offers the lowest leakage at 2 µA, while RB521S30-AU_R1_000A1 exhibits the highest at 100 µA.

Q: What is the operating temperature range for each part?

A: RB511SM-30FHT2R specifies maximum junction temperature of 125°C without a minimum temperature specification. RB511SM-30T2R also specifies 125°C maximum. RB521S30T5G, BAT54TS-AU_R1_000A1, and RB521S30-AU_R1_000A1 all specify -55°C to 125°C operating range, providing extended low-temperature capability. For applications requiring operation below 0°C, the similar substitutes with extended temperature range are appropriate selections.

Q: Are all parts RoHS3 compliant?

A: Yes. All listed parts, including the main part RB511SM-30FHT2R and all substitutes, are ROHS3 compliant. All parts also carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture control requirements during storage or handling.

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