2DD2661-13 Equivalent & Substitute Parts

Part Overview

The 2DD2661-13 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device features a 12 V collector-emitter breakdown voltage, 2 A maximum collector current, and 900 mW power dissipation in a surface mount SOT-89-3 package. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility while meeting current component availability and compliance standards.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	12	V
Current - Collector (Ic) (Max)	2	A
Power - Max	900	mW
Frequency - Transition	170	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	270 @ 200mA, 2V	—
Vce Saturation (Max) @ Ib, Ic	180mV @ 50mA, 1A	—
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-243AA (SOT-89-3)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the 2DD2661-13 is determined by strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Mandatory Compatibility Criteria:

Transistor Type: NPN (required for circuit function)
Package / Case: TO-243AA or equivalent SOT-89-3 footprint (required for PCB assembly)
Mounting Type: Surface Mount (required for manufacturing process)
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 12 V
Current - Collector (Ic) (Max): Must equal or exceed 2 A
Operating Temperature Range: Must encompass -55°C to 150°C

Secondary Compatibility Criteria:

Power - Max: Must equal or exceed 900 mW
Frequency - Transition: Should maintain similar or superior performance
DC Current Gain (hFE): Should provide equivalent or superior gain characteristics
Vce Saturation: Should maintain similar saturation voltage for switching applications

Three substitute parts meet these criteria with varying performance enhancements and availability status.

Parameter Comparison

Parameter	2DD2661-13 (Main)	2SD2661T100	FCX619TA	PBSS301NX,115
Manufacturer	Diodes Incorporated	Rohm Semiconductor	Diodes Incorporated	NXP USA Inc.
Product Status	Obsolete	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	12 V	12 V	50 V	12 V
Current - Collector (Ic) (Max)	2 A	2 A	3 A	5.3 A
Power - Max	900 mW	2 W	2 W	2.1 W
Frequency - Transition	170 MHz	360 MHz	165 MHz	140 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	270 @ 200mA, 2V	270 @ 200mA, 2V	100 @ 2A, 2V	250 @ 2A, 2V
Vce Saturation (Max) @ Ib, Ic	180mV @ 50mA, 1A	180mV @ 50mA, 1A	320mV @ 100mA, 2.75A	200mV @ 265mA, 5.3A
Operating Temperature Range	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C	-55 to 150 °C
Package / Case	TO-243AA (SOT-89-3)	TO-243AA (MPT3)	TO-243AA (SOT-89-3)	TO-243AA (SOT-89)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Inventory Status	10300 Pcs (Obsolete)	723 Pcs (Active)	51600 Pcs (Active)	428436 Pcs (Active)

Engineering Selection Recommendations

2SD2661T100 (Rohm Semiconductor)

The 2SD2661T100 provides direct electrical equivalence to the 2DD2661-13 with identical voltage, current, and saturation characteristics. This part maintains the same DC current gain (270 @ 200mA, 2V) and saturation voltage (180mV @ 50mA, 1A), ensuring drop-in compatibility in existing circuit designs. The transition frequency is enhanced to 360 MHz, and power dissipation is increased to 2 W. The part is classified as active with limited inventory (723 pcs). The package designation differs (MPT3 versus SOT-89-3), requiring verification of PCB footprint compatibility despite both using the TO-243AA case outline.

FCX619TA (Diodes Incorporated)

The FCX619TA is a manufacturer-recommended substitute from the same supplier as the main part. This device exceeds the 2DD2661-13 specifications in collector current (3 A versus 2 A) and collector-emitter breakdown voltage (50 V versus 12 V), providing enhanced performance margin for higher-stress applications. The transition frequency (165 MHz) and power dissipation (2 W) are superior. The saturation voltage is higher (320mV @ 100mA, 2.75A), which may affect switching speed in low-voltage applications. Inventory availability is excellent (51600 pcs). The SOT-89-3 package matches the original part specification.

PBSS301NX,115 (NXP USA Inc.)

The PBSS301NX,115 is a manufacturer-recommended substitute offering the highest current capability (5.3 A) and power dissipation (2.1 W) among the three alternatives. This part maintains the 12 V collector-emitter breakdown voltage and provides superior current handling for applications requiring higher drive capability. The DC current gain (250 @ 2A, 2V) is comparable to the original part. Inventory availability is exceptional (428436 pcs). The transition frequency (140 MHz) is slightly lower than the original specification. The SOT-89 package designation indicates compatibility with the TO-243AA footprint.

All three substitute parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. Selection should be based on specific application requirements regarding current capacity, voltage margin, and switching speed.

Frequently Asked Questions (FAQ)

Q: Can the 2SD2661T100 be used as a direct replacement for the 2DD2661-13?

A: The 2SD2661T100 provides electrical equivalence with identical voltage (12 V), current (2 A), and saturation characteristics. However, the package designation differs (MPT3 versus SOT-89-3). While both use the TO-243AA case outline, PCB footprint compatibility must be verified with the specific layout design before implementation.

Q: What is the primary advantage of the FCX619TA substitute?

A: The FCX619TA provides enhanced voltage margin (50 V versus 12 V) and increased current capacity (3 A versus 2 A), making it suitable for applications requiring higher performance headroom. It is supplied by the same manufacturer as the original part and uses the identical SOT-89-3 package specification.

Q: Why does the PBSS301NX,115 have higher current rating than the original part?

A: The PBSS301NX,115 is designed for higher-current applications with a maximum collector current of 5.3 A and power dissipation of 2.1 W. This part is suitable for circuits requiring greater drive capability while maintaining the same 12 V collector-emitter breakdown voltage as the original 2DD2661-13.

Q: Are all substitute parts surface mount components?

A: Yes, all three substitute parts are surface mount devices with TO-243AA case outlines. The specific package designations (SOT-89-3, MPT3, SOT-89) refer to supplier-specific naming conventions for the same physical package, ensuring compatibility with surface mount assembly processes.

Q: Do the substitute parts meet current environmental compliance standards?

A: All three substitute parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: Which substitute part has the best inventory availability?

A: The PBSS301NX,115 has the highest inventory availability with 428,436 pieces in stock, followed by the FCX619TA with 51,600 pieces. The 2SD2661T100 has limited availability with 723 pieces.

Q: Can the FCX619TA be used in applications designed for 12 V operation?

A: Yes, the FCX619TA is rated for 50 V collector-emitter breakdown voltage, which exceeds the 12 V requirement of the original circuit. The higher voltage rating provides additional safety margin without affecting operation in 12 V circuits. However, the saturation voltage is higher (320mV versus 180mV), which may impact switching performance in low-voltage, high-current applications.

Q: What is the operating temperature range for all substitute parts?

A: All substitute parts operate across the same temperature range as the original 2DD2661-13: -55°C to 150°C junction temperature, ensuring compatibility with applications requiring extended temperature operation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message