2SD1898-Q-TP Equivalent & Substitute Parts

Part Overview

The 2SD1898-Q-TP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications in surface mount configurations. This transistor operates at a maximum collector current of 1 A with a collector-emitter breakdown voltage of 80 V and a maximum power dissipation of 500 mW. The device is packaged in SOT-89 (TO-243AA) surface mount format with a transition frequency of 100 MHz and an operating temperature range of -55°C to 150°C.

The 2SD1898-Q-TP maintains Active product status. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the NPN transistor category, enabling direct replacement in circuit applications where the specified parameters are met.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	80	V
Power - Max	500	mW
Frequency - Transition	100	MHz
Mounting Type	Surface Mount	—
Package / Case	TO-243AA	—
Operating Temperature Range	-55 to 150	°C

Substitute Part Grouping Explanation

Substitute parts for the 2SD1898-Q-TP are qualified based on the following electrical and mechanical parameters:

Primary Matching Criteria:

Transistor Type: NPN
Current - Collector (Ic) Max: 1 A
Voltage - Collector Emitter Breakdown (Max): 80 V
Mounting Type: Surface Mount
Package / Case: TO-243AA

Secondary Compatibility Parameters:

Vce Saturation characteristics at specified bias conditions
DC Current Gain (hFE) performance envelope
Frequency - Transition capability
Operating Temperature range support

All substitute parts listed maintain compatibility with the TO-243AA package footprint and support the core electrical specifications of 1 A collector current and 80 V breakdown voltage. Variations in power dissipation rating, transition frequency, and DC current gain are documented to enable informed selection based on application requirements.

Parameter Comparison

Parameter	2SD1898-Q-TP (Micro Commercial Co)	2SD1898T100Q (Rohm Semiconductor)	BCX56-10,135 (Nexperia USA Inc.)	BCX56-16,147 (Nexperia USA Inc.)
Transistor Type	NPN	NPN	NPN	NPN
Current - Collector (Ic) Max	1 A	1 A	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	80 V	80 V	80 V	80 V
Vce Saturation (Max) @ Ib, Ic	400mV @ 20mA, 500mA	400mV @ 20mA, 500mA	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	1µA (ICBO)	1µA (ICBO)	100nA (ICBO)	100nA (ICBO)
DC Current Gain (hFE) Min @ Ic, Vce	82 @ 500mA, 3V	120 @ 500mA, 3V	63 @ 150mA, 2V	100 @ 150mA, 2V
Power - Max	500 mW	2 W	1.25 W	1.25 W
Frequency - Transition	100 MHz	100 MHz	180 MHz	180 MHz
Operating Temperature (TJ)	-55 to 150°C	150°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Supplier Device Package	SOT-89	MPT3	SOT-89	SOT-89
Product Status	Active	Not For New Designs	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

2SD1898T100Q (Rohm Semiconductor): This part provides electrical equivalence with identical Vce saturation and transition frequency specifications. However, the product status is listed as "Not For New Designs," which restricts its use in new circuit development. The 2 W power rating exceeds the original specification. This part is suitable only for legacy system maintenance or replacement applications where the original part number is unavailable.

BCX56-10,135 (Nexperia USA Inc.): This part meets all core electrical requirements with 1 A collector current and 80 V breakdown voltage in the TO-243AA package. The transition frequency of 180 MHz exceeds the original 100 MHz specification, providing enhanced high-frequency performance. The 1.25 W power rating provides increased thermal headroom. Active product status and ROHS3 compliance support long-term availability and regulatory requirements. DC current gain of 63 @ 150mA, 2V is lower than the original specification and requires circuit verification for gain-dependent applications.

BCX56-16,147 (Nexperia USA Inc.): This part provides full electrical compatibility with 1 A collector current and 80 V breakdown voltage. The transition frequency of 180 MHz and 1.25 W power rating match the BCX56-10,135 specifications. Active product status and ROHS3 compliance ensure regulatory compliance and supply continuity. The DC current gain of 100 @ 150mA, 2V is higher than the original 82 @ 500mA, 3V specification, providing improved gain margin for circuit applications.

For new designs, BCX56-16,147 or BCX56-10,135 are preferred due to Active product status and ROHS3 compliance. Selection between these two Nexperia parts depends on DC current gain requirements: BCX56-16,147 provides higher gain (100), while BCX56-10,135 provides lower gain (63) at different bias conditions.

Frequently Asked Questions (FAQ)

Q: Can the 2SD1898-Q-TP be directly replaced with the 2SD1898T100Q?

A: Electrical substitution is possible based on matching Ic, Vce breakdown, and Vce saturation specifications. However, the 2SD1898T100Q carries a "Not For New Designs" status, limiting its application to legacy system maintenance only. For new designs, Nexperia BCX56 series parts are recommended.

Q: What is the difference between BCX56-10,135 and BCX56-16,147?

A: Both parts share identical electrical specifications for Ic (1 A), Vce breakdown (80 V), power rating (1.25 W), and transition frequency (180 MHz). The primary difference is DC current gain: BCX56-16,147 provides 100 @ 150mA, 2V, while BCX56-10,135 provides 63 @ 150mA, 2V. Selection depends on circuit gain requirements and bias point specifications.

Q: Are all substitute parts available in the same package?

A: All substitute parts use the TO-243AA package footprint, ensuring mechanical compatibility. However, supplier device packages differ: the original 2SD1898-Q-TP uses SOT-89, the 2SD1898T100Q uses MPT3, and the Nexperia parts use SOT-89. Verify footprint compatibility with PCB design files before implementation.

Q: What is the impact of higher transition frequency in the BCX56 series?

A: The BCX56-10,135 and BCX56-16,147 provide 180 MHz transition frequency compared to the original 100 MHz. This higher frequency capability supports faster switching applications and improved high-frequency performance. For applications operating below 100 MHz, this parameter does not impact circuit function.

Q: Are the substitute parts RoHS compliant?

A: The 2SD1898T100Q, BCX56-10,135, and BCX56-16,147 are all ROHS3 compliant. The original 2SD1898-Q-TP RoHS status is not specified in the provided data. Verify RoHS compliance requirements with your procurement or regulatory department before final part selection.

Q: How do Vce saturation differences affect circuit performance?

A: The original 2SD1898-Q-TP specifies 400mV @ 20mA, 500mA, while BCX56 parts specify 500mV @ 50mA, 500mA. The higher saturation voltage in BCX56 parts results in slightly increased collector-emitter voltage in saturation mode. For switching applications with tight saturation requirements, circuit simulation or testing is necessary to confirm performance margins.

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

A: The original 2SD1898-Q-TP operates from -55°C to 150°C. The substitute parts (2SD1898T100Q, BCX56-10,135, BCX56-16,147) specify only the maximum temperature of 150°C. For applications requiring operation below 0°C, the original part or equivalent documentation from manufacturers is required to confirm low-temperature performance.

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