MA2S7840GL Equivalent & Substitute Parts

Part Overview

The MA2S7840GL is a Schottky diode manufactured by Panasonic Electronic Components, rated for 30 V DC reverse voltage and 100 mA average rectified current in a surface mount SC-79/SOD-523 package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating available packaging and supplier options.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	100	mA
Voltage - Forward (Vf) (Max) @ If	550 mV @ 100 mA	mV
Technology	Schottky	—
Reverse Recovery Time (trr)	2	ns
Current - Reverse Leakage @ Vr	15 µA @ 30 V	µA
Mounting Type	Surface Mount	—
Package / Case	SC-79, SOD-523	—
Operating Temperature - Junction (Max)	125	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MA2S7840GL is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

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

Substitution Logic:

Parts are grouped into two categories based on current rating compatibility:

Category 1 - Direct Current Rating Match (100 mA): Parts RB500SM-30FHT2R and RB501SM-30FHT2R maintain the exact 100 mA current specification. These parts are fully interchangeable from an electrical standpoint, with differences in forward voltage characteristics and reverse leakage specifications. Both are active products with automotive qualification (AEC-Q101).

Category 2 - Higher Current Rating (200 mA): Parts RB520S-30-TP, RB520S30T1G, and SBAT54XV2T1G are rated for 200 mA average rectified current, exceeding the MA2S7840GL specification. These parts operate within the same 30 V reverse voltage envelope and are electrically compatible for applications requiring the original 100 mA specification, as they provide additional current margin.

Category 3 - Lower Current Rating (30 mA): Part RB751S40T5G is rated for 30 mA average rectified current. This part does not meet the minimum 100 mA current requirement and is not suitable as a direct substitute.

All substitute parts maintain SC-79/SOD-523 package compatibility and surface mount mounting type.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [mV]	Vf Test Condition	Reverse Leakage [µA]	Leakage Test Condition	Package	Product Status	Temp Junction (Max) [°C]
MA2S7840GL	Panasonic	30	100	550	@ 100 mA	15	@ 30 V	SC-79, SOD-523	Obsolete	125
RB500SM-30FHT2R	Rohm	30	100	450	@ 10 mA	0.5	@ 10 V	SC-79, SOD-523	Active	150
RB501SM-30FHT2R	Rohm	30	100	350	@ 10 mA	10	@ 10 V	SC-79, SOD-523	Active	125
RB520S-30-TP	Micro Commercial Co	30	200	600	@ 200 mA	1	@ 10 V	SC-79, SOD-523	Active	125
RB520S30T1G	onsemi	30	200	600	@ 200 mA	1	@ 10 V	SC-79, SOD-523	Active	150
RB751S40T5G	onsemi	30	30	370	@ 1 mA	0.5	@ 30 V	SC-79, SOD-523	Active	150
SBAT54XV2T1G	onsemi	30	200	800	@ 100 mA	2	@ 25 V	SC-79, SOD-523	Active	125

Engineering Selection Recommendations

Recommended Substitutes for Direct Replacement:

RB501SM-30FHT2R (Rohm Semiconductor) is the primary recommended substitute. This part matches the 30 V / 100 mA electrical specification exactly, maintains identical maximum junction temperature (125°C), and is an active product with AEC-Q101 automotive qualification. Forward voltage is lower (350 mV @ 10 mA) than the original specification, providing improved efficiency characteristics. Reverse leakage (10 µA @ 10 V) is within acceptable tolerance relative to the original part (15 µA @ 30 V). Inventory availability is substantial (8500 pcs).

RB500SM-30FHT2R (Rohm Semiconductor) is an alternative substitute with identical voltage and current ratings. This part offers superior reverse leakage performance (0.5 µA @ 10 V) and higher maximum junction temperature (150°C). Forward voltage is 450 mV @ 10 mA. AEC-Q101 qualification is included. Inventory is available (842 pcs).

Secondary Substitutes for Higher Current Applications:

RB520S30T1G (onsemi) and RB520S-30-TP (Micro Commercial Co) are electrically compatible for applications where the original 100 mA specification can accommodate 200 mA rated parts. Both maintain 30 V reverse voltage and SC-79/SOD-523 packaging. RB520S30T1G offers extended temperature range (-55°C to 150°C) and high inventory availability (185400 pcs). RB520S-30-TP provides Tape & Reel packaging option with 29100 pcs in stock.

SBAT54XV2T1G (onsemi) is compatible for 200 mA applications with documented reverse recovery time (5 ns) and capacitance specifications (10 pF @ 1 V, 1 MHz). This part is suitable where additional electrical characterization data is required.

Not Recommended:

RB751S40T5G does not meet the minimum 100 mA current requirement (rated 30 mA) and is not suitable as a substitute for the MA2S7840GL.

All recommended substitutes are RoHS3 compliant and REACH unaffected, maintaining regulatory compliance equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can RB501SM-30FHT2R directly replace MA2S7840GL in all applications?

A: Yes. RB501SM-30FHT2R matches the critical electrical parameters: 30 V reverse voltage, 100 mA average rectified current, and identical maximum junction temperature (125°C). The part is pin-compatible in SC-79/SOD-523 packaging. Forward voltage is lower (350 mV vs. 550 mV), which improves circuit efficiency. Reverse leakage is comparable (10 µA @ 10 V vs. 15 µA @ 30 V).

Q: What is the difference between RB500SM-30FHT2R and RB501SM-30FHT2R?

A: Both parts are 30 V / 100 mA Schottky diodes from Rohm with identical voltage and current ratings. RB500SM-30FHT2R has lower forward voltage (450 mV @ 10 mA) and superior reverse leakage (0.5 µA @ 10 V), with higher maximum junction temperature (150°C). RB501SM-30FHT2R has lower forward voltage (350 mV @ 10 mA) and slightly higher reverse leakage (10 µA @ 10 V), with maximum junction temperature of 125°C. Selection depends on thermal and leakage requirements.

Q: Can I use RB520S30T1G (200 mA rated) instead of MA2S7840GL (100 mA rated)?

A: Yes, for applications requiring the original 100 mA specification. RB520S30T1G is rated for 200 mA, providing additional current margin. The 30 V reverse voltage and SC-79/SOD-523 package are identical. Forward voltage is higher (600 mV @ 200 mA), which may affect circuit performance compared to the original 550 mV @ 100 mA specification. This substitution is suitable when higher current capacity is beneficial or when the original part is unavailable.

Q: Why is RB751S40T5G not recommended?

A: RB751S40T5G is rated for 30 mA average rectified current, which is below the MA2S7840GL specification of 100 mA. This part cannot safely carry the required current and will not function as a substitute.

Q: Are all substitute parts automotive qualified?

A: RB500SM-30FHT2R and RB501SM-30FHT2R carry AEC-Q101 automotive qualification. RB520S-30-TP, RB520S30T1G, RB751S40T5G, and SBAT54XV2T1G do not list automotive qualification in the provided specifications. Selection should consider application requirements for automotive compliance.

Q: What packaging options are available for substitutes?

A: All substitute parts use SC-79 or SOD-523 package designations, maintaining mechanical compatibility with the original MA2S7840GL. Supplier device packages vary: RB500SM-30FHT2R and RB501SM-30FHT2R use EMD2; RB520S-30-TP uses SOD-523; RB520S30T1G uses SOD-523; RB751S40T5G uses SOD-523; SBAT54XV2T1G uses SOD-523. Packaging format (Cut Tape, Tape & Reel, Digi-Reel) differs by supplier and should be verified against procurement requirements.

Q: What is the moisture sensitivity level for substitute parts?

A: All substitute parts are classified as MSL 1 (Unlimited), matching the original MA2S7840GL specification. No moisture bake-out is required prior to assembly.

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