FLLD261 Equivalent & Substitute Parts

Part Overview

The FLLD261 is a general-purpose diode array manufactured by onsemi, configured as a 1 Pair Series Connection with a maximum reverse voltage of 100 V and average rectified current of 250 mA per diode. The device is housed in a SOT-23-3 surface mount package and features fast recovery characteristics with a reverse recovery time of 400 ns. The FLLD261 is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Diode Configuration	1 Pair Series Connection
Voltage - DC Reverse (Vr) (Max)	100 V
Current - Average Rectified (Io) (per Diode)	250 mA
Voltage - Forward (Vf) (Max) @ If	1.4 V @ 200 mA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	400 ns
Operating Temperature - Junction	-55°C ~ 150°C
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the FLLD261 is determined by the following critical parameters: diode configuration type, maximum reverse voltage rating, average rectified current per diode, speed classification, and package compatibility. The FLLD261 employs a 1 Pair Series Connection configuration with 100 V reverse voltage and 250 mA current rating in a SOT-23-3 package.

Substitute parts are grouped into two categories:

Direct Substitutes (Configuration and Voltage Compatible): Parts that maintain the same diode configuration and package while operating within the electrical specifications of the FLLD261. These include the MMBD7000HS-7-F, which shares the 1 Pair Series Connection configuration, 100 V reverse voltage rating, and SOT-23-3 package. The MMBD7000HS-7-F provides enhanced current capability at 300 mA and improved reverse recovery time at 4 ns.

Similar Substitutes (Configuration Compatible, Enhanced Ratings): Parts that maintain the 1 Pair Series Connection configuration and SOT-23-3 package but offer higher voltage or current ratings. The BAV23SQ-13-F operates at 200 V reverse voltage with 400 mA current capability, suitable for applications requiring higher voltage margins.

Configuration Variants (Common Cathode/Anode): The BAV170E6327HTSA1 and BAW156E6327HTSA1 employ different diode configurations (Common Cathode and Common Anode respectively) with reduced voltage and current ratings. These are applicable only when circuit topology permits alternative pin configurations.

Parameter Comparison

Parameter	FLLD261	MMBD7000HS-7-F	BAV23SQ-13-F	BAV170E6327HTSA1	BAW156E6327HTSA1
Manufacturer	onsemi	Diodes Incorporated	Diodes Incorporated	Infineon Technologies	Infineon Technologies
Diode Configuration	1 Pair Series Connection	1 Pair Series Connection	1 Pair Series Connection	1 Pair Common Cathode	1 Pair Common Anode
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	200 V	80 V	80 V
Current - Average Rectified (Io) (per Diode)	250 mA	300 mA	400 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1.4 V @ 200 mA	1.25 V @ 150 mA	1.25 V @ 200 mA	1.25 V @ 150 mA	1.25 V @ 150 mA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed
Reverse Recovery Time (trr)	400 ns	4 ns	50 ns	1.5 µs	1.5 µs
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	150°C (Max)	150°C (Max)
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	Obsolete	Active	Active	Last Time Buy	Last Time Buy

Engineering Selection Recommendations

Primary Substitute: MMBD7000HS-7-F

The MMBD7000HS-7-F is the optimal direct substitute for the FLLD261. Both devices share identical diode configuration (1 Pair Series Connection), identical maximum reverse voltage (100 V), and identical package (SOT-23-3). The MMBD7000HS-7-F provides superior performance characteristics with increased current capability (300 mA versus 250 mA) and significantly improved reverse recovery time (4 ns versus 400 ns). The device is manufactured by Diodes Incorporated with Active product status, ensuring long-term availability and supply continuity. ROHS3 compliance and MSL 1 rating match the original specification.

Secondary Substitute: BAV23SQ-13-F

The BAV23SQ-13-F serves as a substitute for applications requiring enhanced voltage and current margins. This device maintains the 1 Pair Series Connection configuration and SOT-23-3 package while providing doubled reverse voltage capability (200 V) and increased current rating (400 mA). The BAV23SQ-13-F is manufactured by Diodes Incorporated with Active product status. Fast recovery speed classification and ROHS3 compliance are maintained. This substitute is suitable for designs where higher voltage headroom is beneficial.

Configuration Variant Substitutes: BAV170E6327HTSA1 and BAW156E6327HTSA1

The BAV170E6327HTSA1 (Common Cathode) and BAW156E6327HTSA1 (Common Anode) are applicable only when circuit topology permits alternative pin configurations. Both devices are manufactured by Infineon Technologies with Last Time Buy status. These substitutes operate at reduced voltage (80 V) and current (200 mA) ratings compared to the FLLD261. Selection between these variants depends on specific circuit requirements for common cathode or common anode connection topology. ROHS3 compliance is maintained.

Frequently Asked Questions (FAQ)

Q: Can the MMBD7000HS-7-F directly replace the FLLD261 without circuit modification?

A: Yes. The MMBD7000HS-7-F shares identical diode configuration (1 Pair Series Connection), identical reverse voltage rating (100 V), and identical package (SOT-23-3). Pin-to-pin compatibility is maintained. The increased current capability (300 mA versus 250 mA) and improved reverse recovery time (4 ns versus 400 ns) provide enhanced performance without requiring circuit redesign.

Q: What is the primary difference between the FLLD261 and BAV170E6327HTSA1?

A: The primary differences are diode configuration and electrical ratings. The FLLD261 uses 1 Pair Series Connection with 100 V reverse voltage and 250 mA current. The BAV170E6327HTSA1 uses 1 Pair Common Cathode configuration with 80 V reverse voltage and 200 mA current. These differences require circuit topology evaluation before substitution.

Q: When should the BAV23SQ-13-F be selected over the MMBD7000HS-7-F?

A: The BAV23SQ-13-F should be selected when the application requires higher voltage margins or operates in environments with elevated voltage transients. The BAV23SQ-13-F provides 200 V reverse voltage capability compared to the MMBD7000HS-7-F at 100 V. Both maintain identical diode configuration and package compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (MMBD7000HS-7-F, BAV23SQ-13-F, BAV170E6327HTSA1, and BAW156E6327HTSA1) are ROHS3 compliant and maintain MSL 1 (Unlimited) moisture sensitivity rating, matching the original FLLD261 specification.

Q: What is the significance of reverse recovery time differences between substitutes?

A: Reverse recovery time (trr) affects switching speed and switching losses in high-frequency applications. The MMBD7000HS-7-F provides 4 ns trr compared to the FLLD261 at 400 ns, resulting in faster switching transitions and reduced switching losses. The BAV23SQ-13-F provides 50 ns trr. Configuration variant substitutes (BAV170E6327HTSA1 and BAW156E6327HTSA1) provide 1.5 µs trr, suitable for lower-frequency applications.

Q: Is the SOT-23-3 package identical across all substitute parts?

A: Yes. All substitute parts use the TO-236-3, SC-59, SOT-23-3 package designation. Physical footprint and pin spacing are identical, enabling direct PCB layout compatibility without modification.

Q: What product status considerations apply to substitute selection?

A: The MMBD7000HS-7-F and BAV23SQ-13-F carry Active product status, ensuring long-term availability and supply continuity. The BAV170E6327HTSA1 and BAW156E6327HTSA1 carry Last Time Buy status, indicating limited future availability. For new designs, Active status parts are preferred.

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