RN4901,LF(CT Pre-Biased Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The RN4901,LF(CT is a pre-biased dual bipolar transistor (BJT) manufactured by Toshiba Semiconductor and Storage, configured as 1 NPN and 1 PNP transistor pair in a single surface mount package. This component is classified as Active product status and is RoHS3 compliant. The device is designed for applications requiring integrated base bias resistors, eliminating the need for external biasing networks in compact circuit designs. Substitute parts are identified based on matching electrical specifications, package compatibility, and manufacturing certifications to ensure direct functional replacement in existing designs.

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)	4.7	kOhms
Resistor - Emitter Base (R2)	4.7	kOhms
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 10mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	300	mV
Current - Collector Cutoff (Max)	500	nA
Frequency - Transition	250, 200	MHz
Power - Max	200	mW
Package / Case	6-TSSOP, SC-88, SOT-363	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the RN4901,LF(CT are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Transistor configuration (1 NPN, 1 PNP dual pre-biased or 2 NPN dual pre-biased)
Maximum collector current: 100 mA
Collector-emitter breakdown voltage: 50 V
Base and emitter-base resistor values: 4.7 kOhms
Surface mount package compatibility: SOT-363, SC-88, or 6-TSSOP
RoHS3 compliance and MSL rating

Substitution Logic:

Parts are grouped into two categories based on transistor configuration:

Direct Configuration Match (1 NPN, 1 PNP): DCX143EU-7-F and PUMD15,135 maintain identical transistor pairing to the main part, ensuring pin-for-pin compatibility in applications requiring both NPN and PNP functionality.
Dual NPN Configuration (2 NPN): MUN5232DW1T1G, SMUN5232DW1T1G, and PUMH15,115 provide dual NPN pre-biased transistors. These parts are suitable for applications where dual NPN functionality is required instead of mixed polarity pairs.

All substitute parts share the same base resistor values (4.7 kOhms), maximum collector current (100 mA), and collector-emitter breakdown voltage (50 V), ensuring electrical compatibility within the specified operating parameters.

Parameter Comparison

Parameter	RN4901,LF(CT	DCX143EU-7-F	MUN5232DW1T1G	PUMD15,135	PUMH15,115	SMUN5232DW1T1G
Manufacturer	Toshiba	Diodes Inc.	onsemi	Nexperia	Nexperia	onsemi
Transistor Type	1 NPN, 1 PNP	1 NPN, 1 PNP	2 NPN	1 NPN, 1 PNP	2 NPN	2 NPN
Ic (Max)	100 mA	100 mA	100 mA	100 mA	100 mA	100 mA
Vce Breakdown (Max)	50 V	50 V	50 V	50 V	50 V	50 V
R1 (Base)	4.7 kOhms	4.7 kOhms	4.7 kOhms	4.7 kOhms	4.7 kOhms	4.7 kOhms
R2 (Emitter Base)	4.7 kOhms	4.7 kOhms	4.7 kOhms	4.7 kOhms	4.7 kOhms	4.7 kOhms
hFE (Min) @ Ic, Vce	30 @ 10mA, 5V	50/40 @ 10mA, 5V	15 @ 5mA, 10V	30 @ 10mA, 5V	30 @ 10mA, 5V	15 @ 5mA, 10V
Vce Saturation (Max)	300 mV @ 250µA, 5mA	300 mV @ 500µA, 10mA	250 mV @ 1mA, 10mA	150 mV @ 500µA, 10mA	150 mV @ 500µA, 10mA	250 mV @ 1mA, 10mA
Ic Cutoff (Max)	500 nA	500 nA	500 nA	1 µA	1 µA	500 nA
Frequency - Transition	250, 200 MHz	250 MHz	—	—	—	—
Power - Max	200 mW	200 mW	250 mW	300 mW	300 mW	187 mW
Package	6-TSSOP, SC-88, SOT-363	SOT-363	SC-88/SC70-6/SOT-363	6-TSSOP	6-TSSOP	SC-88/SC70-6/SOT-363
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Automotive Grade	—	—	—	AEC-Q100	AEC-Q100	—

Engineering Selection Recommendations

Direct Substitutes (Pin-Compatible, Same Configuration):

DCX143EU-7-F (Diodes Incorporated) and PUMD15,135 (Nexperia) are direct functional equivalents maintaining the 1 NPN, 1 PNP configuration. Both parts are Active product status and RoHS3 compliant. DCX143EU-7-F is supplied in SOT-363 package. PUMD15,135 is supplied in 6-TSSOP package and carries AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components.

Dual NPN Alternatives:

MUN5232DW1T1G, SMUN5232DW1T1G (both onsemi), and PUMH15,115 (Nexperia) provide dual NPN pre-biased transistor configurations. These parts are suitable for applications where dual NPN functionality replaces the mixed polarity requirement. PUMH15,115 carries AEC-Q100 automotive qualification. All three parts are Active product status and RoHS3 compliant.

Compliance and Certification:

All substitute parts maintain RoHS3 compliance and MSL rating of 1 (Unlimited). Nexperia parts (PUMD15,135 and PUMH15,115) include AEC-Q100 automotive qualification, appropriate for automotive and industrial applications requiring enhanced reliability standards.

Package Considerations:

Selection between substitute parts depends on PCB layout requirements. SOT-363 packages (DCX143EU-7-F, MUN5232DW1T1G, SMUN5232DW1T1G) and 6-TSSOP packages (PUMD15,135, PUMH15,115) are mechanically compatible within the specified package family but require verification of PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can DCX143EU-7-F directly replace RN4901,LF(CT in all applications?

A: DCX143EU-7-F maintains identical transistor configuration (1 NPN, 1 PNP), base resistor values (4.7 kOhms), maximum collector current (100 mA), and collector-emitter breakdown voltage (50 V). Both parts are RoHS3 compliant with MSL rating 1. The primary difference is package designation (SOT-363 vs. US6/6-TSSOP). Verify PCB footprint compatibility before substitution.

Q: What is the difference between the 1 NPN, 1 PNP configuration and the 2 NPN configuration?

A: The RN4901,LF(CT contains one NPN transistor and one PNP transistor in a single package, suitable for complementary switching or amplification circuits. MUN5232DW1T1G, SMUN5232DW1T1G, and PUMH15,115 contain two NPN transistors, appropriate for applications requiring dual NPN functionality. Configuration selection depends on circuit topology requirements.

Q: Are Nexperia parts (PUMD15,135 and PUMH15,115) suitable for automotive applications?

A: Yes. Both Nexperia parts carry AEC-Q100 automotive qualification, indicating compliance with automotive reliability and quality standards. These parts are appropriate for automotive and industrial applications requiring enhanced qualification levels.

Q: What are the package compatibility considerations?

A: RN4901,LF(CT is supplied in US6 package (6-TSSOP designation). DCX143EU-7-F uses SOT-363 package. PUMD15,135 and PUMH15,115 use 6-TSSOP package. MUN5232DW1T1G and SMUN5232DW1T1G use SC-88/SC70-6/SOT-363 packages. All packages are surface mount with 6 pins. Verify PCB footprint compatibility with your design before component selection.

Q: Do all substitute parts have the same power dissipation rating?

A: No. RN4901,LF(CT has 200 mW maximum power rating. DCX143EU-7-F also has 200 mW. MUN5232DW1T1G has 250 mW. PUMD15,135 and PUMH15,115 have 300 mW. SMUN5232DW1T1G has 187 mW. Select parts based on your circuit's power dissipation requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (DCX143EU-7-F, MUN5232DW1T1G, PUMD15,135, PUMH15,115, SMUN5232DW1T1G) are RoHS3 compliant with MSL rating 1 (Unlimited), matching the compliance profile of RN4901,LF(CT.

Q: What is the significance of the 4.7 kOhms base resistor value?

A: The 4.7 kOhms base resistor (R1) and emitter-base resistor (R2) are integrated into the pre-biased transistor package, eliminating the need for external biasing resistors. All substitute parts maintain identical 4.7 kOhms resistor values, ensuring equivalent biasing characteristics and circuit behavior.

Q: Can I use SMUN5232DW1T1G if my application requires lower power dissipation?

A: SMUN5232DW1T1G has a maximum power rating of 187 mW, lower than RN4901,LF(CT (200 mW). This part is suitable only if your circuit's actual power dissipation remains below 187 mW. Verify thermal requirements before substitution.

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