2SD1664T100Q Equivalent & Substitute Parts Reference

Part Overview

The Rohm Semiconductor 2SD1664T100Q is a surface mount NPN bipolar junction transistor (BJT) rated at 32 V, 1 A, and 2 W, with a transition frequency of 150 MHz. It is supplied in a TO-243AA (MPT3) package and is currently listed as "Not For New Designs." For ongoing engineering projects and applications requiring continued supply or design-in of this transistor type, it is necessary to identify alternative models with matching or compatible electrical, mechanical, and compliance parameters.

Key Parameters

Manufacturer Part Number	Transistor Type	Current - Collector (Ic) (Max)	Voltage - Collector Emitter Breakdown (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max) (ICBO)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Frequency - Transition	Operating Temperature (TJ)	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	MSL	REACH Status	ECCN	HTSUS
2SD1664T100Q	NPN	1 A	32 V	400mV @ 50mA, 500mA	500nA	120 @ 100mA, 3V	2 W	150MHz	150°C	Surface Mount	TO-243AA	MPT3	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected	EAR99	8541.29.0075

Substitute Part Grouping Explanation

The substitute parts for 2SD1664T100Q are grouped based strictly on electrical and mechanical compatibility. The grouping logic requires these key matching parameters:

Transistor type: NPN
Collector current rating (Ic)
Collector-Emitter breakdown voltage (Vce)
Saturation voltage maximum (Vce(sat))
Collector cutoff current (ICBO)
DC current gain (hFE) minimum value at specified test conditions
Maximum power dissipation
Transition frequency (ft)
Maximum operating junction temperature (TJ)
Surface mount mounting
Package/case type
Compliance status (RoHS, REACH)
Moisture Sensitivity Level (MSL)
ECCN and HTSUS classifications

Substitute parts included fulfill these requirements based solely on provided input parameters, ensuring functional and compliance compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Current - Collector (Ic) (Max)	Voltage - Collector Emitter Breakdown (Max)	Vce Saturation (Max) @ Ib, Ic	Current - Collector Cutoff (Max) (ICBO)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Frequency - Transition	Operating Temperature (TJ)	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	MSL	REACH Status	ECCN	HTSUS	Product Status
2SD1664T100Q	Rohm Semiconductor	NPN	1 A	32 V	400mV @ 50mA, 500mA	500nA	120 @ 100mA, 3V	2 W	150MHz	150°C	Surface Mount	TO-243AA	MPT3	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected	EAR99	8541.29.0075	Not For New Designs
2DD1664Q-13	Diodes Incorporated	NPN	1 A	32 V	400mV @ 50mA, 500mA	100nA	120 @ 100mA, 3V	1 W	280MHz	-55°C ~ 150°C	Surface Mount	TO-243AA	SOT-89-3	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected	EAR99	8541.29.0075	Active
BSR41,115	Nexperia USA Inc.	NPN	1 A	60 V	500mV @ 50mA, 500mA	100nA	100 @ 100mA, 5V	1.35 W	100MHz	150°C	Surface Mount	TO-243AA	SOT-89	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected	EAR99	8541.29.0075	Active
2SD1664-R-TP	Micro Commercial Co	NPN	1 A	32 V	400mV @ 50mA, 500mA	500nA	180 @ 100mA, 3V	500 mW	150MHz	-55°C ~ 150°C	Surface Mount	TO-243AA	SOT-89	Not Specified	Not Specified	REACH Unaffected	EAR99	8541.21.0075	Active

Engineering Selection Recommendations

The main part (2SD1664T100Q) has a "Not For New Designs" status. All listed substitutes are active products, with matching or similar compliance certifications: ROHS3 Compliant, REACH Unaffected, and MSL 1 (Unlimited). Only substitute parts with these certifications should be selected for applications requiring compliant, active, and available devices within the transistors, bipolar (BJT) category.

Frequently Asked Questions (FAQ)

Q: What parameters must match to substitute a surface mount BJT transistor?
A: Substitute selection requires matching transistor type (NPN), collector current rating, collector-emitter breakdown voltage, DC current gain (hFE), maximum power dissipation, operating temperature, package/case type, and compliance markers.

Q: Are SOT-89 and MPT3 devices compatible with TO-243AA mounting?
A: All listed parts specify TO-243AA package compatibility in provided parameters.

Q: How does the product status of a transistor affect substitute selection?
A: Product status indicates ongoing support and availability. "Active" status substitutes are suitable for new and sustaining designs, while "Not For New Designs" signals obsolescence for primary parts.

Q: Do all substitute parts comply with ROHS3 and REACH?
A: According to provided data, all substitutes except 2SD1664-R-TP specify ROHS3 compliance; all specify REACH unaffected status.

Q: Why is collector current and breakdown voltage critical in substitute selection for BJT transistors?
A: These parameters determine the maximum current and voltage capabilities of the device and must be matched for functional equivalency in a given circuit.

Q: Is the Moisture Sensitivity Level (MSL) relevant for surface mount transistor replacement?
A: All compared parts specify MSL 1 (Unlimited), indicating suitability for standard surface mount assembly processes.

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