RN2301,LF Pre-Biased PNP Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The Toshiba Semiconductor RN2301,LF is an active pre-biased PNP bipolar transistor (BJT) designed for surface mount applications in SC-70 (SOT-323) packaging. This component operates at 50 V collector-emitter breakdown voltage with a maximum collector current of 100 mA and 100 mW power dissipation. The device features integrated base and emitter-base resistors (4.7 kOhms each) for simplified circuit design and reduced component count.

Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility across multiple manufacturers is required. All substitute parts listed maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP - Pre-Biased	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	100	mA
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	300mV @ 250µA, 5mA	—
Current - Collector Cutoff (Max)	500	nA
Frequency - Transition	200	MHz
Power - Max	100	mW
Package / Case	SC-70, SOT-323	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the RN2301,LF is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP - Pre-Biased (mandatory)
Voltage - Collector Emitter Breakdown: 50 V (minimum requirement)
Current - Collector (Ic) (Max): 100 mA (minimum requirement)
Resistor - Base (R1): 4.7 kOhms (exact match required for circuit biasing)
Resistor - Emitter Base (R2): 4.7 kOhms (exact match required for circuit biasing)
DC Current Gain (hFE) (Min): 30 @ 10mA, 5V (minimum requirement)
Package / Case: SC-70 or SOT-323 (mechanical compatibility)
Mounting Type: Surface Mount (process compatibility)
RoHS Status: ROHS3 Compliant (regulatory requirement)
Moisture Sensitivity Level: 1 (Unlimited) (handling requirement)

Secondary Compatibility Parameters:

Vce Saturation: 300 mV or lower (switching performance)
Current - Collector Cutoff: 500 nA or lower (leakage specification)
Frequency - Transition: 200 MHz or higher (speed capability)
Power - Max: 100 mW or higher (thermal capability)

Parts that deviate from primary substitution criteria in base resistor values (R1, R2) or collector current ratings are classified as similar alternatives and require circuit re-evaluation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	R1 kOhms	R2 kOhms	hFE (Min)	Vce Sat (Max) mV	Package	Power (Max) mW	Frequency MHz
RN2301,LF	Toshiba Semiconductor and Storage	100	50	4.7	4.7	30	300	SC-70	100	200
PDTA143EU,115	Nexperia USA Inc.	100	50	4.7	4.7	30	150	SOT-323	200	—
DDTA143EUA-7-F	Diodes Incorporated	100	50	4.7	4.7	20	300	SOT-323	200	250
DTA043XUBTL	Rohm Semiconductor	100	50	4.7	10	35	150	UMT3F	200	250
DTA114EUAT106	Rohm Semiconductor	50	50	10	10	30	300	UMT3	200	250
DTA115EUAT106	Rohm Semiconductor	20	50	100	100	82	300	UMT3	200	250
DTA123EUAT106	Rohm Semiconductor	100	50	2.2	2.2	20	300	UMT3	200	250
DTA124EUAT106	Rohm Semiconductor	30	50	22	22	56	300	UMT3	200	250
DTA143EUA-TP	Micro Commercial Co	100	50	4.7	4.7	30	300	SOT-323	200	250
DTA143EUAT106	Rohm Semiconductor	100	50	4.7	4.7	30	300	UMT3	200	250
MUN5132T1G	onsemi	100	50	4.7	4.7	15	250	SC-70-3 (SOT323)	202	—

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

The following parts satisfy all primary substitution criteria and maintain identical electrical biasing characteristics:

PDTA143EU,115 (Nexperia USA Inc.): Matches all critical parameters including 4.7 kOhm base resistors, 100 mA collector current, and 50 V breakdown voltage. Offers improved Vce saturation (150 mV) and doubled power rating (200 mW). ROHS3 compliant with REACH unaffected status.
DTA143EUA-TP (Micro Commercial Co): Identical electrical specifications to RN2301,LF with 4.7 kOhm resistors and 100 mA rating. SOT-323 package compatible. ROHS3 compliant with REACH unaffected status.
DTA143EUAT106 (Rohm Semiconductor): Matches all primary parameters with 4.7 kOhm base resistors and 100 mA collector current. UMT3 package variant. ROHS3 compliant with REACH unaffected status.
MUN5132T1G (onsemi): Meets all critical electrical requirements with 4.7 kOhm resistors and 100 mA rating. SC-70-3 (SOT323) package. ROHS3 compliant with REACH unaffected status.

Compatible Alternatives (Require Application Verification):

DDTA143EUA-7-F (Diodes Incorporated): Maintains 4.7 kOhm resistors and 100 mA rating with enhanced frequency capability (250 MHz). Vce saturation matches at 300 mV. Lower hFE (20 vs. 30) requires circuit evaluation. ROHS3 compliant with REACH unaffected status.

Limited Substitutes (Application-Specific Only):

DTA043XUBTL (Rohm Semiconductor): Supports 100 mA with 4.7 kOhm base resistor but features 10 kOhm emitter-base resistor (vs. 4.7 kOhm). UMT3F package differs from SC-70. Circuit biasing re-evaluation required.
DTA114EUAT106 (Rohm Semiconductor): Reduced collector current (50 mA vs. 100 mA) with modified base resistors (10 kOhms). Suitable only for lower-current applications.
DTA123EUAT106 (Rohm Semiconductor): Supports 100 mA but features reduced base resistors (2.2 kOhms vs. 4.7 kOhms). Lower hFE (20 vs. 30) and modified biasing network. Circuit re-evaluation required.
DTA124EUAT106 (Rohm Semiconductor): Reduced collector current (30 mA vs. 100 mA) with significantly modified base resistors (22 kOhms). Not suitable for 100 mA applications.
DTA115EUAT106 (Rohm Semiconductor): Severely reduced collector current (20 mA vs. 100 mA) with 100 kOhm base resistors. Not suitable for primary application.

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can PDTA143EU,115 be used as a direct replacement for RN2301,LF?

A: Yes. PDTA143EU,115 satisfies all primary substitution criteria with identical 4.7 kOhm base and emitter-base resistors, 100 mA collector current, and 50 V breakdown voltage. The improved Vce saturation (150 mV vs. 300 mV) and doubled power rating (200 mW vs. 100 mW) provide enhanced performance margins. Both parts are ROHS3 compliant with MSL 1 rating.

Q: What is the difference between SC-70 and SOT-323 packaging?

A: SC-70 and SOT-323 are equivalent designations for the same surface mount package. Both refer to a 3-lead small outline transistor package with identical pin configuration and footprint. Parts specified as SC-70, SOT-323, or SC-70-3 (SOT323) are mechanically interchangeable.

Q: Why do some substitute parts have different base resistor values?

A: Base resistor values (R1 and R2) determine the internal biasing network of pre-biased transistors. Deviations from 4.7 kOhms alter the transistor's switching characteristics and bias point. Parts with different resistor values (such as DTA043XUBTL with 10 kOhm R2 or DTA123EUAT106 with 2.2 kOhm resistors) require circuit re-evaluation and are not direct substitutes.

Q: Can DTA114EUAT106 replace RN2301,LF in a 100 mA application?

A: No. DTA114EUAT106 is rated for maximum 50 mA collector current, which is insufficient for applications requiring 100 mA. Additionally, it features 10 kOhm base resistors instead of 4.7 kOhms, altering the biasing network. This part is suitable only for reduced-current applications.

Q: What does hFE (DC Current Gain) represent in pre-biased transistors?

A: hFE is the DC current gain, representing the ratio of collector current to base current. In pre-biased transistors, hFE affects the transistor's switching speed and saturation characteristics. The RN2301,LF specifies minimum hFE of 30 @ 10mA, 5V. Substitute parts with lower hFE values (such as DDTA143EUA-7-F at 20) may exhibit slower switching response and require verification in timing-critical applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance, meeting regulatory requirements for hazardous substance restrictions.

Q: What is Vce Saturation and why does it matter?

A: Vce Saturation is the minimum collector-emitter voltage when the transistor is fully saturated (conducting). Lower Vce saturation values indicate better switching efficiency and reduced power dissipation. RN2301,LF specifies 300 mV maximum. PDTA143EU,115 offers improved saturation at 150 mV, while other substitutes maintain the 300 mV specification.

Q: Can MUN5132T1G be used in place of RN2301,LF?

A: Yes. MUN5132T1G meets all primary substitution criteria with 4.7 kOhm resistors, 100 mA rating, and 50 V breakdown voltage. The SC-70-3 (SOT323) package is mechanically compatible. However, the lower hFE (15 vs. 30) may affect switching characteristics in timing-sensitive circuits and should be verified.

Q: What is the significance of Frequency - Transition (fT)?

A: Frequency - Transition (fT) indicates the maximum frequency at which the transistor maintains unity current gain. Higher fT values indicate faster switching capability. RN2301,LF specifies 200 MHz. Substitute parts with 250 MHz (such as DDTA143EUA-7-F and DTA143EUA-TP) provide enhanced high-frequency performance.

Q: Is packaging type important when selecting a substitute?

A: Yes. While SC-70 and SOT-323 are equivalent, other package variants (such as UMT3 or UMT3F) have different physical dimensions and land patterns. Mechanical compatibility with the PCB footprint must be verified. Parts specified as UMT3 or UMT3F require footprint confirmation before substitution.

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