MMBD2004S Equivalent & Substitute Parts

Part Overview

The MMBD2004S is a general-purpose diode array manufactured by Diodes Incorporated, configured as 1 pair series connection in a surface mount SOT-23-3 package. This component is rated for 240 V DC reverse voltage and 225 mA average rectified current per diode, with fast recovery characteristics suitable for switching applications. The MMBD2004S is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Series Connection	—
Voltage - DC Reverse (Vr) (Max)	240	V
Current - Average Rectified (Io) (per Diode)	225	mA (DC)
Voltage - Forward (Vf) (Max) @ If	1	V @ 100 mA
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100	nA @ 240 V
Operating Temperature - Junction	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the MMBD2004S is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode configuration must be 1 pair series connection
Voltage - DC Reverse (Vr) must be ≥ 240 V
Current - Average Rectified (Io) must be ≥ 225 mA per diode
Voltage - Forward (Vf) must be ≤ 1 V @ 100 mA
Reverse Recovery Time (trr) must be ≤ 50 ns
Mounting type must be surface mount
Package must be TO-236-3, SC-59, or SOT-23-3 compatible

Secondary Considerations:

Operating temperature range must encompass -65°C to 150°C junction temperature
RoHS3 compliance status for regulatory alignment
Product status (active preferred over discontinued)

Parts that deviate from these parameters are classified as non-equivalent and are excluded from direct substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [mA]	Vf (Max) @ If [V]	trr [ns]	Speed	Package	Product Status	RoHS Status
MMBD2004S	Diodes Incorporated	240	225	1 @ 100 mA	50	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Discontinued	Non-compliant
MMBD2004S-7-F	Diodes Incorporated	240	225	1 @ 100 mA	50	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
MMBD2004SQ-7-F	Diodes Incorporated	240	225	1 @ 100 mA	50	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
CMPD2004S TR PBFREE	Central Semiconductor Corp	240	200	1 @ 100 mA	50	Small Signal ≤ 200mA, Any Speed	SOT-23	Active	ROHS3 Compliant
BAS21SLT1G	onsemi	250	225	1.25 @ 200 mA	50	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
BAS101S,215	Nexperia USA Inc.	300	200	1.1 @ 100 mA	50	Small Signal ≤ 200mA, Any Speed	SOT-23-3	Active	ROHS3 Compliant
GSD2004S-G3-18	Vishay General Semiconductor	240	225	1 @ 100 mA	50	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
GSD2004S-E3-08	Vishay General Semiconductor	240	225	1 @ 100 mA	50	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
MMBD2004S-TP	Micro Commercial Co	300	225	1 @ 100 mA	50	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Substitutes (Full Parameter Match):

MMBD2004S-7-F, MMBD2004SQ-7-F, GSD2004S-G3-18, and GSD2004S-E3-08 are direct parametric equivalents to the MMBD2004S. These parts maintain identical electrical specifications: 240 V reverse voltage, 225 mA average rectified current, 1 V forward voltage at 100 mA, 50 ns reverse recovery time, and fast recovery speed characteristics. All are active products with ROHS3 compliance. MMBD2004SQ-7-F carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

Compatible Substitutes (Minor Parameter Deviations):

BAS21SLT1G (onsemi) provides 250 V reverse voltage and 225 mA current rating with fast recovery characteristics. Forward voltage is specified at 1.25 V @ 200 mA rather than 1 V @ 100 mA, representing a minor deviation acceptable in most applications. Operating temperature range is -55°C to 150°C, which covers the upper portion of the MMBD2004S range.

MMBD2004S-TP (Micro Commercial Co) offers enhanced voltage rating at 300 V reverse voltage while maintaining 225 mA current and identical fast recovery speed. This part is suitable for applications requiring higher voltage margin.

Limited Compatibility (Current Reduction):

CMPD2004S TR PBFREE and BAS101S,215 feature reduced average rectified current ratings of 200 mA, below the 225 mA specification of the MMBD2004S. These parts are suitable only for applications where the actual operating current does not exceed 200 mA. CMPD2004S operates at small signal speed classification, while BAS101S,215 carries AEC-Q100 automotive qualification.

Non-Equivalent Parts:

CMSD2838 TR PBFREE is excluded from substitution due to incompatible diode configuration (1 pair common cathode versus 1 pair series connection), significantly lower voltage rating (75 V), and different package (SOT-323 versus SOT-23-3).

Frequently Asked Questions (FAQ)

Q: Can MMBD2004S-7-F directly replace MMBD2004S in existing designs?

A: Yes. MMBD2004S-7-F is a parametric equivalent with identical electrical specifications and package. The primary difference is product status (active versus discontinued) and RoHS3 compliance. No design modifications are required.

Q: What is the difference between MMBD2004S-7-F and MMBD2004SQ-7-F?

A: Both parts are parametric equivalents with identical electrical ratings. MMBD2004SQ-7-F carries AEC-Q101 automotive qualification, making it suitable for automotive applications requiring specific reliability standards. MMBD2004S-7-F is the standard industrial grade version.

Q: Can BAS21SLT1G be used as a direct replacement?

A: BAS21SLT1G is compatible for most applications. It maintains the 225 mA current rating and fast recovery speed. The forward voltage specification differs (1.25 V @ 200 mA versus 1 V @ 100 mA), and the reverse voltage is slightly higher at 250 V. These differences are acceptable in applications where the actual operating conditions do not require the exact MMBD2004S specifications.

Q: Why is CMPD2004S TR PBFREE listed as a substitute if it has lower current rating?

A: CMPD2004S TR PBFREE is listed as a compatible substitute only for applications where the actual operating current does not exceed 200 mA. It maintains the 240 V voltage rating, 50 ns recovery time, and SOT-23 package compatibility. Designers must verify that circuit operating conditions remain within the 200 mA limit.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status. The original MMBD2004S is RoHS non-compliant. This compliance difference is significant for applications subject to RoHS regulations.

Q: What is the significance of the package designation differences (SOT-23 versus SOT-23-3)?

A: SOT-23-3 and SOT-23 refer to the same physical package with three leads. The designations are equivalent for PCB layout and assembly purposes. All listed parts are compatible with SOT-23-3 footprints.

Q: Can MMBD2004S-TP be used in applications requiring the exact 240 V rating?

A: Yes. MMBD2004S-TP operates at 300 V reverse voltage, which exceeds the 240 V requirement. The higher voltage rating provides additional safety margin and is suitable for all applications designed for 240 V operation. No design modifications are necessary.

Q: What is the difference between fast recovery and small signal speed classifications?

A: Fast recovery diodes (≤ 500 ns) are optimized for switching applications requiring rapid turn-off characteristics. Small signal diodes (any speed classification) are general-purpose components without specific speed optimization. The MMBD2004S specifies fast recovery, making it suitable for high-frequency switching. Substitutes with small signal classification may exhibit different switching behavior in time-critical applications.

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