2DD1766Q-13 Equivalent & Substitute Parts

Part Overview

The 2DD1766Q-13 is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-89-3 package. This device operates at a maximum collector current of 2 A and collector-emitter breakdown voltage of 32 V, with a maximum power dissipation of 1 W and transition frequency of 220 MHz. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	2	A
Voltage - Collector Emitter Breakdown (Max)	32	V
Vce Saturation (Max)	800	mV @ 200mA, 2A
Power - Max	1	W
Frequency - Transition	220	MHz
DC Current Gain (hFE) (Min)	120	@ 500mA, 3V
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-89-3 (TO-243AA)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 2DD1766Q-13 is determined by the following critical parameters: transistor type (NPN), package format (SOT-89-3 surface mount), maximum collector current capability, maximum collector-emitter breakdown voltage, power dissipation rating, and transition frequency. Substitute parts must maintain NPN polarity and surface mount compatibility. The collector current and voltage ratings establish the operational envelope; substitutes may exceed these specifications without functional degradation in the original circuit. Transition frequency and saturation voltage characteristics influence switching performance and must be evaluated against circuit requirements. All identified substitutes maintain RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Parameter Comparison

Parameter	2DD1766Q-13	FCX491TA	NSS30101LT1G	PBSS303NX,115
Manufacturer	Diodes Incorporated	Diodes Incorporated	onsemi	Nexperia USA Inc.
Product Status	Obsolete	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN
Current - Collector (Ic) (Max)	2 A	1 A	1 A	5.1 A
Voltage - Collector Emitter Breakdown (Max)	32 V	60 V	30 V	30 V
Vce Saturation (Max)	800 mV @ 200mA, 2A	500 mV @ 100mA, 1A	200 mV @ 100mA, 1A	220 mV @ 255mA, 5.1A
Power - Max	1 W	1 W	310 mW	2.1 W
Frequency - Transition	220 MHz	150 MHz	100 MHz	130 MHz
DC Current Gain (hFE) (Min)	120 @ 500mA, 3V	100 @ 500mA, 5V	300 @ 500mA, 5V	250 @ 2A, 2V
Operating Temperature Range	-55 to 150 °C	-65 to 150 °C	-55 to 150 °C	Up to 150 °C
Package / Case	SOT-89-3 (TO-243AA)	SOT-89-3 (TO-243AA)	SOT-23-3 (TO-236)	SOT-89 (TO-243AA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

FCX491TA (Diodes Incorporated): This active substitute maintains the same manufacturer and SOT-89-3 package format as the 2DD1766Q-13. The FCX491TA operates at a reduced maximum collector current of 1 A compared to the original 2 A specification, but provides higher collector-emitter breakdown voltage (60 V versus 32 V). The transition frequency is lower at 150 MHz. This substitute is suitable for applications where the original 2 A current requirement can be accommodated by parallel configurations or where circuit design permits operation at reduced current levels. Extended operating temperature range (-65°C to 150°C) provides additional thermal margin.

NSS30101LT1G (onsemi): This active substitute operates at 1 A maximum collector current and 30 V breakdown voltage, closely matching the voltage specification of the original part. The package format differs (SOT-23-3 versus SOT-89-3), requiring PCB layout modification. Power dissipation is limited to 310 mW, restricting applications to lower power scenarios. The DC current gain is significantly higher (300 minimum), and transition frequency is lower (100 MHz). This substitute is applicable where board space constraints favor the smaller SOT-23-3 package and circuit requirements align with reduced power and current specifications.

PBSS303NX,115 (Nexperia USA Inc.): This active substitute provides the highest collector current capability at 5.1 A, exceeding the original 2 A specification. The collector-emitter breakdown voltage is 30 V, matching the original specification. The package format is SOT-89, compatible with SOT-89-3 footprints. Power dissipation rating of 2.1 W exceeds the original 1 W specification. This device carries AEC-Q100 automotive qualification, suitable for automotive and high-reliability applications. The transition frequency is lower at 130 MHz. This substitute is appropriate for applications requiring higher current capacity or automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can the FCX491TA directly replace the 2DD1766Q-13 in all applications?

A: The FCX491TA maintains identical package format (SOT-89-3) and can be used as a direct PCB replacement. However, the reduced maximum collector current (1 A versus 2 A) requires circuit evaluation. Applications operating at or near 2 A collector current must be redesigned or use parallel transistor configurations. The higher breakdown voltage (60 V) provides additional design margin for overvoltage conditions.

Q: Why does the NSS30101LT1G have a different package (SOT-23-3) than the original part?

A: The NSS30101LT1G uses the smaller SOT-23-3 package, which reduces board space requirements but necessitates PCB layout redesign. The SOT-23-3 package is not footprint-compatible with SOT-89-3. This substitute is selected when space constraints are prioritized over direct pin-for-pin compatibility. The reduced power rating (310 mW) also limits this substitute to lower-power circuit implementations.

Q: Is the PBSS303NX,115 suitable for non-automotive applications?

A: Yes. The PBSS303NX,115 is an active substitute suitable for general-purpose applications. The AEC-Q100 automotive qualification indicates enhanced reliability and quality assurance but does not restrict use to automotive circuits. The higher current rating (5.1 A) and power dissipation (2.1 W) make this substitute appropriate for applications requiring greater current capacity than the original 2 A specification.

Q: What is the impact of lower transition frequency in substitute parts?

A: The original 2DD1766Q-13 operates at 220 MHz transition frequency. Substitute parts operate at lower frequencies (FCX491TA at 150 MHz, NSS30101LT1G at 100 MHz, PBSS303NX,115 at 130 MHz). Lower transition frequency reduces maximum switching speed capability. Applications operating at frequencies below the substitute part's transition frequency specification experience no functional degradation. High-frequency switching circuits must be evaluated to confirm the substitute's transition frequency is adequate for the intended operating frequency.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (FCX491TA, NSS30101LT1G, and PBSS303NX,115) are RoHS3 compliant and carry unlimited moisture sensitivity level (MSL 1), matching the environmental compliance profile of the original 2DD1766Q-13.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: No. Each substitute part has distinct electrical characteristics. A single design must select one substitute based on circuit requirements for collector current, breakdown voltage, power dissipation, and switching frequency. Mixing different substitute parts in the same circuit is not recommended unless circuit topology explicitly permits parallel or independent operation of multiple transistor stages.

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