MMBD1205 Equivalent & Substitute Parts

Part Overview

The MMBD1205 is a general-purpose diode array manufactured by onsemi, configured as 1 pair common anode with a maximum DC reverse voltage of 100 V and average rectified current of 200 mA per diode. The device is housed in a SOT-23-3 surface mount package and is classified as Active product status. This component is suitable for applications requiring small-signal rectification and switching functions in compact form factors.

Substitute parts are identified when design requirements change, inventory constraints occur, or alternative sourcing becomes necessary while maintaining functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Anode	—
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io) (per Diode)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	—
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	50 nA @ 50 V	—
Operating Temperature - Junction (Max)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MMBD1205 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Diode Configuration: 1 Pair Common Anode
Current - Average Rectified (Io): 200 mA per diode
Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, SOT-23-3

Voltage Rating Consideration: The MMBD1205 operates at a maximum DC reverse voltage of 100 V. Substitute parts are grouped based on their voltage ratings relative to this specification. Parts with equal or higher voltage ratings provide direct substitution capability. Parts with lower voltage ratings are classified as substitutes only when circuit design permits operation within their reduced voltage envelope.

Secondary Parameters Affecting Substitution:

Voltage - Forward (Vf) characteristics
Reverse Recovery Time (trr)
Current - Reverse Leakage
Operating Temperature range
Product Status and compliance certifications

All identified substitute parts maintain the same diode configuration, current rating, and package form factor as the MMBD1205.

Parameter Comparison

Parameter	MMBD1205	BAW56LT3G	MMBD4148CA	CMPD2836E TR PBFREE	CMPD3003A TR PBFREE
Manufacturer	onsemi	onsemi	Taiwan Semiconductor Corporation	Central Semiconductor Corp	Central Semiconductor Corp
Diode Configuration	1 Pair Common Anode	1 Pair Common Anode	1 Pair Common Anode	1 Pair Common Anode	1 Pair Common Anode
Voltage - DC Reverse (Vr) (Max)	100 V	70 V	75 V	120 V	180 V
Current - Average Rectified (Io) (per Diode)	200 mA	200 mA	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	1.25 V @ 150 mA	1 V @ 10 mA	1 V @ 100 mA	1.15 V @ 300 mA
Reverse Recovery Time (trr)	4 ns	6 ns	4 ns	4 ns	Not specified
Current - Reverse Leakage @ Vr	50 nA @ 50 V	2.5 µA @ 70 V	5 µA @ 75 V	100 nA @ 80 V	1 nA @ 125 V
Operating Temperature - Junction	150°C (Max)	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Substitution (Equal or Superior Voltage Rating):

CMPD2836E TR PBFREE and CMPD3003A TR PBFREE are suitable for direct substitution in applications where the MMBD1205 is specified. Both parts exceed the 100 V reverse voltage rating of the MMBD1205 (120 V and 180 V respectively) while maintaining identical diode configuration, current rating, and package form factor. All three parts are Active product status with ROHS3 compliance.

Conditional Substitution (Lower Voltage Rating):

BAW56LT3G and MMBD4148CA operate at reduced maximum reverse voltage ratings of 70 V and 75 V respectively, compared to the MMBD1205 at 100 V. These parts are suitable substitutes only when circuit design and application requirements permit operation within their specified voltage envelope. Both maintain identical diode configuration, current rating, and package compatibility.

Compliance and Certification:

All identified substitute parts maintain ROHS3 compliance and REACH Unaffected status consistent with the MMBD1205. All parts are classified as Active product status, ensuring continued availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can BAW56LT3G replace MMBD1205 in all applications?

A: BAW56LT3G is a suitable substitute only when the application circuit operates at reverse voltages not exceeding 70 V. The MMBD1205 is rated for 100 V maximum reverse voltage. If the circuit design requires the full 100 V rating, BAW56LT3G is not appropriate.

Q: What is the primary difference between MMBD4148CA and MMBD1205?

A: MMBD4148CA operates at a maximum reverse voltage of 75 V compared to MMBD1205 at 100 V. Both parts share identical diode configuration, current rating, and package form factor. The forward voltage characteristic of MMBD4148CA is specified at 10 mA, whereas MMBD1205 is specified at 200 mA.

Q: Are CMPD2836E TR PBFREE and CMPD3003A TR PBFREE interchangeable with MMBD1205?

A: Yes. Both Central Semiconductor parts exceed the voltage rating of MMBD1205 (120 V and 180 V respectively) while maintaining identical diode configuration, current rating, and SOT-23-3 package. All three parts are Active status with ROHS3 compliance.

Q: Does package compatibility guarantee functional substitution?

A: Package compatibility is a necessary but not sufficient condition for substitution. The diode configuration, current rating, and voltage rating must also match or exceed the original specification. All identified substitute parts meet these criteria in addition to package compatibility.

Q: What is the significance of reverse recovery time (trr) in substitution decisions?

A: Reverse recovery time affects switching speed and switching losses in high-frequency applications. MMBD1205, MMBD4148CA, and CMPD2836E TR PBFREE all specify 4 ns trr. BAW56LT3G specifies 6 ns. CMPD3003A TR PBFREE does not specify this parameter. In applications sensitive to switching transients, parts with matching trr specifications are preferred.

Q: Can lower voltage-rated parts be used in circuits designed for higher voltage ratings?

A: No. Using a part with a lower maximum reverse voltage rating in a circuit designed for higher voltages creates risk of component failure and circuit malfunction. Voltage ratings must equal or exceed circuit requirements.

Q: Are all substitute parts available in the same packaging options as MMBD1205?

A: All identified substitute parts are available in SOT-23-3 surface mount package. Packaging options (Cut Tape, Tape & Reel) may vary by supplier and part number. Verify packaging availability with your component supplier.

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