RN4987,LF(CT Pre-Biased Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The RN4987,LF(CT is a pre-biased dual bipolar transistor (BJT) manufactured by Toshiba Semiconductor and Storage. This surface mount component integrates one NPN and one PNP transistor with internal biasing resistors in a 6-TSSOP (SOT-363) package. The device operates at 50V maximum collector-emitter breakdown voltage with 100mA maximum collector current and 200mW power dissipation. The part is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit functional alternatives that meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	1 NPN, 1 PNP - Pre-Biased (Dual)	-
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Resistor - Base (R1)	10	kOhms
Resistor - Emitter Base (R2)	47	kOhms
Power - Max	200	mW
Frequency - Transition	250, 200	MHz
Package / Case	6-TSSOP, SC-88, SOT-363	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the RN4987,LF(CT is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor configuration: 1 NPN, 1 PNP - Pre-Biased (Dual)
Maximum collector current: 100mA
Maximum collector-emitter breakdown voltage: 50V
Base resistor (R1): 10kOhms
Emitter-base resistor (R2): 47kOhms
Package type: SOT-363 (6-TSSOP, SC-88)
Surface mount technology
RoHS3 compliance

Substitute Parts with Full Compatibility:

Parts meeting all primary criteria with identical transistor configuration (1 NPN, 1 PNP):

DCX114EU-13R-F (Diodes Incorporated)
DCX114YU-7-F (Diodes Incorporated)
ACX114YUQ-7R (Diodes Incorporated)
ACX114YUQ-13R (Diodes Incorporated)

Partial Compatibility Parts:

Parts with different transistor configurations (2 NPN instead of 1 NPN, 1 PNP):

ADC114YUQ-13 (Diodes Incorporated)
ADC114YUQ-7 (Diodes Incorporated)
MUN5214DW1T1G (onsemi)

These parts share electrical ratings (50V, 100mA, SOT-363 package) but differ in internal transistor topology and are suitable only when application requirements permit dual NPN configuration.

Additional Substitute Parts:

Parts with modified base and emitter-base resistor values:

DCX114EU-13R-F (R1: 10kOhms, R2: 10kOhms)
DCX114EUQ-13-F (R1: 10kOhms, R2: 10kOhms)
DCX114EUQ-13R-F (R1: 10kOhms, R2: 10kOhms)
DCX114EUQ-7-F (R1: 10kOhms, R2: 10kOhms)

These parts maintain the 1 NPN, 1 PNP configuration and SOT-363 package but feature different internal resistor values, requiring circuit validation before substitution.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Ic (Max) mA	Vce Breakdown (Max) V	R1 (Base) kOhms	R2 (Emitter-Base) kOhms	Power (Max) mW	Frequency MHz	Package	Grade
RN4987,LF(CT	Toshiba	1 NPN, 1 PNP	100	50	10	47	200	250, 200	SOT-363	-
ACX114YUQ-13R	Diodes Inc.	1 NPN, 1 PNP	100	50	10	47	270	250	SOT-363	Automotive
ACX114YUQ-7R	Diodes Inc.	1 NPN, 1 PNP	100	50	10	47	270	250	SOT-363	Automotive
DCX114EU-13R-F	Diodes Inc.	1 NPN, 1 PNP	100	50	10	10	200	250	SOT-363	-
DCX114YU-7-F	Diodes Inc.	1 NPN, 1 PNP	100	50	10	47	200	250	SOT-363	-
DCX114EUQ-13-F	Diodes Inc.	1 NPN, 1 PNP	100	50	10	10	200	250	SOT-363	Automotive
DCX114EUQ-13R-F	Diodes Inc.	1 NPN, 1 PNP	100	50	10	10	200	250	SOT-363	Automotive
DCX114EUQ-7-F	Diodes Inc.	1 NPN, 1 PNP	100	50	10	10	200	250	SOT-363	Automotive
ADC114YUQ-13	Diodes Inc.	2 NPN	100	50	10, 47	10, 47	270	250	SOT-363	Automotive
ADC114YUQ-7	Diodes Inc.	2 NPN	100	50	10, 47	10, 47	270	250	SOT-363	Automotive
MUN5214DW1T1G	onsemi	2 NPN	100	50	10	47	250	-	SOT-363	-

Engineering Selection Recommendations

Direct Substitutes (Identical Configuration):

The following parts provide direct substitution with matching 1 NPN, 1 PNP configuration and 10kOhms/47kOhms resistor values:

ACX114YUQ-7R and ACX114YUQ-13R: Diodes Incorporated automotive-grade parts with AEC-Q101 qualification. These parts feature 270mW power rating (exceeding the 200mW specification) and are suitable for applications requiring automotive qualification. REACH Unaffected status confirmed.
DCX114YU-7-F: Diodes Incorporated part with matching 200mW power rating and identical resistor configuration. Non-automotive grade. Suitable for general industrial applications.

Substitutes with Modified Resistor Values:

Parts with altered base and emitter-base resistor values (10kOhms/10kOhms instead of 10kOhms/47kOhms):

DCX114EU-13R-F: Non-automotive grade, 200mW power rating, 250MHz transition frequency.
DCX114EUQ-13-F, DCX114EUQ-13R-F, DCX114EUQ-7-F: Automotive-grade parts with AEC-Q101 qualification. These require circuit validation due to modified internal resistor network affecting biasing characteristics.

Partial Compatibility Substitutes (Dual NPN Configuration):

ADC114YUQ-13 and ADC114YUQ-7: Automotive-grade dual NPN configuration. Suitable only when application topology permits two NPN transistors instead of complementary NPN/PNP pair.
MUN5214DW1T1G: onsemi dual NPN part with matching 10kOhms/47kOhms resistor values and 250mW power rating. Non-automotive grade.

Compliance and Certification Status:

All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Automotive-grade substitutes (ACX114, ADC114, DCX114EUQ series) carry AEC-Q101 qualification and REACH Unaffected status, suitable for automotive applications. Non-automotive substitutes (DCX114EU, DCX114YU, MUN5214) are appropriate for general industrial and consumer applications.

Frequently Asked Questions (FAQ)

Q: Can ACX114YUQ-7R directly replace RN4987,LF(CT in all applications?

A: ACX114YUQ-7R provides direct electrical substitution with identical transistor configuration (1 NPN, 1 PNP), matching resistor values (10kOhms/47kOhms), and equivalent electrical ratings (50V, 100mA, SOT-363 package). The higher power rating (270mW vs. 200mW) and automotive qualification (AEC-Q101) make it suitable for applications where the original part is used. Circuit validation is not required for parameter compatibility.

Q: What is the difference between DCX114YU-7-F and DCX114EUQ-7-F?

A: Both parts share identical electrical specifications (1 NPN, 1 PNP, 10kOhms/47kOhms resistors, 50V, 100mA, 200mW, SOT-363). The primary difference is automotive qualification: DCX114EUQ-7-F carries AEC-Q101 certification and is designated for automotive applications, while DCX114YU-7-F is non-automotive grade. The EUQ variant also includes REACH Unaffected status documentation.

Q: Why do some substitutes have different resistor values (10kOhms/10kOhms)?

A: Parts such as DCX114EU-13R-F and DCX114EUQ series feature modified internal resistor networks (10kOhms/10kOhms instead of 10kOhms/47kOhms). These resistor values directly affect the biasing network and switching characteristics. Substitution requires circuit analysis to confirm compatibility with the intended application biasing requirements.

Q: Can MUN5214DW1T1G replace RN4987,LF(CT?

A: MUN5214DW1T1G is a dual NPN configuration, whereas RN4987,LF(CT is 1 NPN, 1 PNP. Direct substitution is not possible in applications requiring complementary transistor pairs. Substitution is only valid in circuits designed for dual NPN topology. The matching 10kOhms/47kOhms resistor values and 50V/100mA ratings provide electrical compatibility for dual NPN applications.

Q: Are all substitute parts available in the same SOT-363 package?

A: Yes. All listed substitute parts are specified in 6-TSSOP, SC-88, SOT-363 package format with surface mount technology. Package compatibility is confirmed across all alternatives, permitting direct PCB footprint compatibility without layout modifications.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 is the automotive electronics council qualification standard for discrete semiconductors. Parts carrying this certification (ACX114, ADC114, DCX114EUQ series) have undergone rigorous testing for automotive applications including temperature cycling, moisture resistance, and reliability validation. Non-qualified parts are suitable for industrial and consumer applications but not for automotive use cases.

Q: Can I use ADC114YUQ-13 in place of RN4987,LF(CT?

A: ADC114YUQ-13 is a dual NPN device, not a complementary NPN/PNP pair. Substitution is only valid if the application circuit is designed for dual NPN topology. The electrical ratings (50V, 100mA, SOT-363) are compatible, but the transistor configuration difference requires circuit redesign or validation to confirm functional equivalence.

Q: What is the difference between ACX114YUQ-7R and ACX114YUQ-13R?

A: Both parts are identical in electrical specifications and transistor configuration (1 NPN, 1 PNP, 10kOhms/47kOhms, 50V, 100mA, 270mW, SOT-363). The designation suffix (-7R vs. -13R) indicates different tape and reel packaging configurations or manufacturing date codes. Electrical and functional performance is equivalent.

Q: Is the higher power rating (270mW) of ACX114 parts a concern?

A: No. The higher power rating (270mW vs. 200mW) of ACX114YUQ and ADC114YUQ parts represents improved thermal capability and does not create compatibility issues. The device will operate within the same power envelope as the original RN4987,LF(CT, with additional thermal margin available.

Q: Are there any REACH or environmental compliance differences between substitutes?

A: All listed substitute parts maintain ROHS3 compliance. Diodes Incorporated parts (ACX114, ADC114, DCX114EUQ, DCX114EU, DCX114YU) are specified as REACH Unaffected. onsemi MUN5214DW1T1G is also REACH Unaffected. No environmental compliance barriers exist for substitution.

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