MMBD1705A Equivalent & Substitute Parts

Part Overview

The MMBD1705A is a general-purpose diode array manufactured by onsemi, configured as 1 pair common anode in a surface mount TO-236-3 (SOT-23-3) package. This component is rated for 30 V DC reverse voltage and 50 mA average rectified current per diode. The part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Common Anode
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io) (per Diode)	50 mA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 50 mA
Technology	Standard
Speed	Small Signal ≤ 200mA (Io), Any Speed
Reverse Recovery Time (trr)	1 ns
Current - Reverse Leakage @ Vr	50 nA @ 20 V
Operating Temperature - Junction	150°C (Max)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MMBD1705A is determined by the following critical parameters:

Configuration Match: All substitute parts maintain the 1 pair common anode diode array configuration, ensuring pin-compatible replacement in existing circuit layouts.

Package Compatibility: All substitute parts use the TO-236-3, SC-59, or SOT-23-3 surface mount package, enabling direct PCB footprint compatibility.

Voltage Rating: Substitute parts must support the application's maximum reverse voltage requirement. The MMBD1705A operates at 30 V maximum; substitute parts with equal or higher voltage ratings (35 V, 40 V) are electrically compatible.

Current Rating: The MMBD1705A is rated for 50 mA per diode. Substitute parts with equal or higher current ratings (100 mA) provide functional equivalence and design margin.

Technology Type: Standard silicon diode technology substitutes are directly compatible. The CMPSH-3A-TP uses Schottky technology, which offers lower forward voltage but operates within the same package and configuration.

Compliance & Status: All substitute parts maintain ROHS3 compliance and MSL-1 moisture sensitivity rating. Active product status ensures ongoing availability and supply chain continuity.

Parameter Comparison

Parameter	MMBD1705A	M1MA151WAT1G	MMBD2835LT1G	SMMBD2835LT1G	CMPSH-3A-TP
Manufacturer	onsemi	onsemi	onsemi	onsemi	Micro Commercial Co
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)	30 V	40 V	35 V	35 V	30 V
Current - Average Rectified (Io) (per Diode)	50 mA	100 mA (DC)	100 mA (DC)	100 mA (DC)	100 mA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 50 mA	1.2 V @ 100 mA	1.2 V @ 100 mA	1.2 V @ 100 mA	1 V @ 100 mA
Technology	Standard	Standard	Standard	Standard	Schottky
Speed	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed
Reverse Recovery Time (trr)	1 ns	10 ns	4 ns	4 ns	4 ns
Current - Reverse Leakage @ Vr	50 nA @ 20 V	100 nA @ 35 V	100 nA @ 30 V	100 nA @ 30 V	500 nA @ 30 V
Operating Temperature - Junction	150°C (Max)	150°C (Max)	-55°C ~ 150°C	-55°C ~ 150°C	-55°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	REACH Unaffected
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not specified
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (onsemi Standard Diodes):

M1MA151WAT1G, MMBD2835LT1G, and SMMBD2835LT1G are direct functional equivalents manufactured by onsemi. All three maintain active product status, ensuring long-term supply availability. These parts exceed the MMBD1705A specifications in voltage rating (35 V–40 V) and current capacity (100 mA), providing design margin for applications operating near the original part's rated limits. MMBD2835LT1G and SMMBD2835LT1G offer extended operating temperature range (-55°C to 150°C) compared to the MMBD1705A (150°C maximum), suitable for industrial and automotive environments. M1MA151WAT1G provides the highest voltage rating (40 V) for applications requiring additional reverse voltage margin.

Alternative Substitute (Schottky Technology):

CMPSH-3A-TP is a Schottky diode array alternative manufactured by Micro Commercial Co. This part maintains identical package and configuration compatibility but operates with lower forward voltage (1 V @ 100 mA versus 1.1 V–1.2 V for standard diodes). Schottky technology results in higher reverse leakage current (500 nA @ 30 V) compared to standard diodes. CMPSH-3A-TP is suitable for applications where forward voltage drop minimization is critical and reverse leakage is acceptable within circuit design parameters.

Compliance Considerations:

All onsemi substitutes maintain ROHS3 compliance and MSL-1 moisture sensitivity rating, matching the original MMBD1705A specifications. CMPSH-3A-TP carries REACH Unaffected status. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0070.

Frequently Asked Questions (FAQ)

Q: Can MMBD2835LT1G directly replace MMBD1705A in existing designs?

A: Yes. MMBD2835LT1G maintains identical diode configuration (1 pair common anode), package (SOT-23-3), and mounting type (surface mount). The 35 V voltage rating exceeds the MMBD1705A's 30 V specification, and the 100 mA current rating exceeds the 50 mA specification, providing functional compatibility with design margin.

Q: What is the difference between MMBD2835LT1G and SMMBD2835LT1G?

A: Both parts are electrically identical with matching voltage (35 V), current (100 mA), and temperature specifications (-55°C to 150°C). The primary difference is packaging designation: MMBD2835LT1G is supplied in Tape & Reel format, while SMMBD2835LT1G packaging is not specified. Electrical performance and pin compatibility are equivalent.

Q: Why does M1MA151WAT1G have a higher voltage rating (40 V) than MMBD2835LT1G (35 V)?

A: M1MA151WAT1G and MMBD2835LT1G are distinct part numbers from different product lines within onsemi's diode portfolio. Both exceed the MMBD1705A's 30 V requirement. M1MA151WAT1G provides additional voltage margin for applications with higher reverse voltage stress. Selection depends on specific circuit requirements and supply chain availability.

Q: When should CMPSH-3A-TP Schottky diode be selected over standard diode substitutes?

A: CMPSH-3A-TP is selected when forward voltage drop minimization is a design requirement. Schottky diodes exhibit lower forward voltage (1 V @ 100 mA) compared to standard diodes (1.1 V–1.2 V @ 100 mA), reducing power dissipation in high-current applications. However, Schottky technology results in higher reverse leakage current (500 nA @ 30 V), which may be unacceptable in low-leakage circuit designs.

Q: Are all substitute parts compatible with the original MMBD1705A PCB footprint?

A: Yes. All substitute parts use the TO-236-3, SC-59, or SOT-23-3 surface mount package, which share identical pin configurations and PCB footprints. Direct PCB replacement is possible without layout modifications.

Q: What is the significance of the extended temperature range (-55°C to 150°C) in MMBD2835LT1G and SMMBD2835LT1G?

A: The extended temperature range indicates these parts are qualified for industrial and automotive applications operating in environments with temperatures below 0°C. The MMBD1705A specifies only a maximum junction temperature of 150°C without a minimum specification. For applications requiring operation below 0°C, MMBD2835LT1G or SMMBD2835LT1G are required.

Q: How does reverse recovery time (trr) affect circuit performance?

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking. The MMBD1705A specifies 1 ns, while substitutes range from 4 ns to 10 ns. Longer recovery times may affect switching speed in high-frequency applications. For circuits operating below 1 MHz, differences in trr are typically negligible. High-frequency switching applications should evaluate trr specifications against circuit timing requirements.

Q: Is the MMBD1705A obsolete status a concern for new designs?

A: Yes. Obsolete status indicates the part is no longer manufactured and existing inventory will eventually deplete. New designs should incorporate one of the active substitute parts (M1MA151WAT1G, MMBD2835LT1G, SMMBD2835LT1G, or CMPSH-3A-TP) to ensure long-term supply chain continuity and manufacturing support.

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