Equivalent & Substitute Parts for 2SD1898T100Q

Part Overview

2SD1898T100Q is an NPN bipolar junction transistor (BJT) from Rohm Semiconductor, designed for surface mount applications and housed in an MPT3 (TO-243AA) package. Key specifications include 80 V maximum collector-emitter voltage, 1 A maximum collector current, transition frequency of 100 MHz, 2 W power dissipation, and operating temperature up to 150°C. The part is marked "Not For New Designs," indicating designers should seek alternative models for new or updated products to ensure long-term component availability and supply chain reliability.

Key Parameters

Parameter	Value
Manufacturer Part Number	2SD1898T100Q
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	80 V
Current - Collector (Ic) (Max)	1 A
Vce Saturation (Max) @ Ib, Ic	400mV @ 20mA, 500mA
Current - Collector Cutoff (Max)	1µA (ICBO)
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 500mA, 3V
Power - Max	2 W
Frequency - Transition	100 MHz
Operating Temperature	150°C (TJ)
Mounting Type	Surface Mount
Package / Case	TO-243AA
Supplier Device Package	MPT3
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution is strictly based on matching key electrical and mechanical parameters for the transistor category. These include:

NPN transistor type
Maximum collector-emitter breakdown voltage (≥ 80 V)
Maximum collector current (≥ 1 A)
Maximum power dissipation (comparable or sufficient for application)
Frequency transition capability (similar or higher)
Surface mount package (TO-243AA form factor compatibility)
RoHS and REACH compliance
Maximum operating temperature (up to 150°C)
Similar or lower Vce saturation values at equivalent test currents
DC current gain (hFE) at specified collector current and voltage
Moisture Sensitivity Level (MSL) 1 (Unlimited)

All listed substitute parts adhere to these provided criteria and can be considered for direct replacement or drop-in equivalence within the defined product category.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Transistor Type	Voltage - Collector Emitter (Max)	Current - Collector (Max)	Vce Saturation (Max)	Current - Collector Cutoff (Max)	DC Current Gain (hFE) (Min) @ Ic, Vce	Power - Max	Frequency - Transition	Operating Temp (Max)	Mounting Type	Package / Case	Supplier Device Package	RoHS Status	REACH Status	MSL
2SD1898T100Q	Rohm Semiconductor	NPN	80 V	1 A	400mV @ 20mA, 500mA	1µA (ICBO)	120 @ 500mA, 3V	2 W	100 MHz	150°C	Surface Mount	TO-243AA	MPT3	ROHS3 Compliant	REACH Unaffected	1 (Unlimited)
BCX5616TA	Diodes Incorporated	NPN	80 V	1 A	500mV @ 50mA, 500mA	100nA (ICBO)	100 @ 150mA, 2V	1 W	150 MHz	150°C	Surface Mount	TO-243AA	SOT-89-3	ROHS3 Compliant	REACH Unaffected	1 (Unlimited)
BSR43,115	Nexperia USA Inc.	NPN	80 V	1 A	500mV @ 50mA, 500mA	100nA (ICBO)	100 @ 100mA, 5V	1.35 W	100 MHz	150°C	Surface Mount	TO-243AA	SOT-89	ROHS3 Compliant	REACH Unaffected	1 (Unlimited)
2SC3646S-TD-E	onsemi	NPN	100 V	1 A	400mV @ 40mA, 400mA	100nA (ICBO)	100 @ 100mA, 5V	500 mW	120 MHz	150°C	Surface Mount	TO-243AA	PCP	ROHS3 Compliant	REACH Unaffected	1 (Unlimited)
BCX56,115	Nexperia USA Inc.	NPN	80 V	1 A	500mV @ 50mA, 500mA	100nA (ICBO)	63 @ 150mA, 2V	1.25 W	180 MHz	150°C	Surface Mount	TO-243AA	SOT-89	ROHS3 Compliant	REACH Unaffected	1 (Unlimited)
BCX56-16,135	Nexperia USA Inc.	NPN	80 V	1 A	500mV @ 50mA, 500mA	100nA (ICBO)	100 @ 150mA, 2V	1.25 W	180 MHz	150°C	Surface Mount	TO-243AA	SOT-89	ROHS3 Compliant	REACH Unaffected	1 (Unlimited)

Engineering Selection Recommendations

The primary part, 2SD1898T100Q, is not recommended for new designs due to its product status. All substitute transistors listed are marked as "Active," RoHS3 compliant, REACH unaffected, and MSL 1 (Unlimited), meeting international compliance and handling standards. For applications requiring ongoing manufacturability and procurement reliability, selection should prioritize substitute parts with active status and matching compliance designations.

Frequently Asked Questions (FAQ)

Q1: Which electrical parameters are most critical for substituting the 2SD1898T100Q?
A1: The transistor type (NPN), maximum collector-emitter voltage (80 V or higher), maximum collector current (1 A), and similar power and frequency ratings are critical for substitution.

Q2: Can surface mount transistors in different supplier packages (e.g., SOT-89 vs. MPT3) substitute for TO-243AA devices?
A2: Substitute transistors listed all share the TO-243AA package. Supplier device packages such as SOT-89, SOT-89-3, and PCP are specified as compatible within this mechanical category.

Q3: Is matching RoHS and REACH compliance mandatory for substitution?
A3: All given substitute parts are RoHS3 compliant and REACH unaffected. These compliance parameters are required for ensuring environmental and regulatory compatibility.

Q4: What implications are there for differences in DC current gain (hFE) and Vce saturation ratings among substitutes?
A4: DC current gain and Vce saturation values are listed per datasheet conditions; all substitutes meet or closely approximate the original part's operating range based on the provided values.

Q5: Are thermal and moisture sensitivity levels compatible for all substitutes?
A5: All compared transistors are rated for up to 150°C operating junction temperature and have Moisture Sensitivity Level (MSL) 1 (Unlimited), ensuring consistent handling and reflow compatibility.

Q6: Why is the 2SD1898T100Q not recommended for new designs?
A6: The product status is defined as "Not For New Designs," which indicates discontinuation or limitation for future use, making substitutes necessary for new or ongoing developments.

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