PEMH13,115 Pre-Biased Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The PEMH13,115 is a pre-biased dual NPN bipolar junction transistor (BJT) manufactured by Nexperia USA Inc. in SOT-666 surface mount packaging. This component integrates two NPN transistors with internal biasing resistors, designed for 50V operation at maximum 100mA collector current and 300mW power dissipation. The part is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Equivalent and substitute parts are necessary for applications requiring continued supply, design flexibility, or alternative sourcing options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Transistor Type	2 NPN - Pre-Biased (Dual)	—
Maximum Collector Current (Ic)	100	mA
Collector-Emitter Breakdown Voltage (Max)	50	V
Base Resistor (R1)	4.7	kOhms
Emitter-Base Resistor (R2)	47	kOhms
DC Current Gain (hFE Min)	100	@ 10mA, 5V
Vce Saturation (Max)	100	mV @ 250µA, 5mA
Maximum Power Dissipation	300	mW
Mounting Type	Surface Mount	—
Package / Case	SOT-666	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the PEMH13,115 is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Transistor configuration: 2 NPN - Pre-Biased (Dual)
Maximum collector current: 100mA
Collector-emitter breakdown voltage: 50V
Base resistor (R1): 4.7kOhms
Emitter-base resistor (R2): 47kOhms
Surface mount packaging with compatible pinout

Secondary Compatibility Factors:

DC current gain (hFE) minimum specification
Vce saturation voltage
Maximum power dissipation rating
RoHS3 compliance and MSL rating

Parts are grouped into two categories based on transistor configuration:

Group A: Dual NPN Pre-Biased (Direct Equivalents)

NSBC143ZDXV6T1G (onsemi)
DDC143TH-7 (Diodes Incorporated)
RN1901FETE85LF (Toshiba Semiconductor and Storage)

Group B: Mixed NPN/PNP Pre-Biased (Functional Alternatives)

RN4906FE,LF(CT (Toshiba Semiconductor and Storage)
RN4986FE,LF(CT (Toshiba Semiconductor and Storage)

Group A parts maintain identical dual NPN configuration and are suitable for direct replacement in applications requiring two independent NPN transistors. Group B parts contain one NPN and one PNP transistor and are applicable only in designs where the PNP function is utilized or can be left unconnected.

Parameter Comparison

Parameter	PEMH13,115	NSBC143ZDXV6T1G	DDC143TH-7	RN1901FETE85LF	RN4906FE,LF(CT	RN4986FE,LF(CT
Manufacturer	Nexperia USA Inc.	onsemi	Diodes Incorporated	Toshiba Semiconductor and Storage	Toshiba Semiconductor and Storage	Toshiba Semiconductor and Storage
Transistor Type	2 NPN - Pre-Biased (Dual)	2 NPN - Pre-Biased (Dual)	2 NPN - Pre-Biased (Dual)	2 NPN - Pre-Biased (Dual)	1 NPN, 1 PNP - Pre-Biased (Dual)	1 NPN, 1 PNP - Pre-Biased (Dual)
Ic (Max)	100	100	100	100	100	100
Vce Breakdown (Max)	50	50	50	50	50	50
R1 (Base Resistor)	4.7k	4.7k	4.7k	4.7k	4.7k	4.7k
R2 (Emitter-Base Resistor)	47k	47k	—	4.7k	47k	47k
hFE (Min)	100 @ 10mA, 5V	80 @ 5mA, 10V	100 @ 1mA, 5V	30 @ 10mA, 5V	80 @ 10mA, 5V	80 @ 10mA, 5V
Vce Saturation (Max)	100mV @ 250µA, 5mA	250mV @ 1mA, 10mA	300mV @ 250µA, 2.5mA	300mV @ 250µA, 5mA	300mV @ 250µA, 5mA	300mV @ 250µA, 5mA
Power (Max)	300	500	150	100	100	100
Frequency - Transition	—	—	250	250	200	250, 200
Package (Supplier)	SOT-666	SOT-563	SOT-563	ES6	ES6	ES6
Product Status	Not For New Designs	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Dual NPN Configuration Required):

NSBC143ZDXV6T1G (onsemi) is the primary equivalent. It maintains identical transistor configuration (2 NPN - Pre-Biased), matching base and emitter-base resistor values (4.7kOhms and 47kOhms), and exceeds power dissipation capability (500mW vs. 300mW). Product status is Active with ROHS3 compliance and MSL 1 rating. Inventory availability is 3854 units.

DDC143TH-7 (Diodes Incorporated) is an alternative dual NPN substitute with Active product status and ROHS3 compliance. This part differs in emitter-base resistor specification (not provided) and reduced power rating (150mW). Inventory availability is 5500 units. Vce saturation is higher (300mV vs. 100mV), which may impact switching performance in low-voltage applications.

RN1901FETE85LF (Toshiba Semiconductor and Storage) maintains dual NPN configuration with Active status and RoHS compliance. This part has significantly lower hFE minimum (30 vs. 100) and reduced power rating (100mW). The emitter-base resistor differs (4.7kOhms vs. 47kOhms), altering biasing characteristics. Inventory availability is 849 units.

For Mixed Configuration Applications (NPN/PNP Dual):

RN4906FE,LF(CT and RN4986FE,LF(CT (both Toshiba Semiconductor and Storage) contain one NPN and one PNP transistor. Both maintain 4.7kOhms base resistor and 47kOhms emitter-base resistor values. These parts are suitable only for designs where both NPN and PNP functions are required or where the PNP transistor can remain unused. Both have Active product status, ROHS3 compliance, and MSL 1 rating. Inventory availability is 5031 units (RN4906FE,LF(CT) and 4645 units (RN4986FE,LF(CT).

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage requirements. All parts carry EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can NSBC143ZDXV6T1G directly replace PEMH13,115 in existing designs?

A: NSBC143ZDXV6T1G is a direct functional equivalent for applications requiring dual NPN pre-biased transistors. It matches the critical parameters: 100mA maximum collector current, 50V breakdown voltage, 4.7kOhms base resistor, and 47kOhms emitter-base resistor. The primary difference is packaging (SOT-563 vs. SOT-666), which requires PCB layout modification. Electrical performance is compatible.

Q: What is the difference between Group A and Group B substitute parts?

A: Group A parts (NSBC143ZDXV6T1G, DDC143TH-7, RN1901FETE85LF) contain two independent NPN transistors, matching the PEMH13,115 configuration. Group B parts (RN4906FE,LF(CT, RN4986FE,LF(CT) contain one NPN and one PNP transistor. Group A parts are suitable for direct replacement. Group B parts are applicable only in designs where the PNP function is utilized or can be left unconnected without affecting circuit operation.

Q: Why do substitute parts have different power ratings?

A: Power dissipation rating reflects the maximum thermal capability of the specific package and die design. NSBC143ZDXV6T1G (500mW) exceeds the PEMH13,115 rating (300mW), providing thermal margin. DDC143TH-7 (150mW) and Toshiba parts (100mW) have lower ratings. Selection depends on actual circuit power dissipation requirements. Lower-rated parts are suitable only if circuit design operates below their maximum power specification.

Q: Are there package compatibility issues between SOT-666 and SOT-563?

A: SOT-666 and SOT-563 are different physical packages with different pinout arrangements and footprints. Direct PCB substitution is not possible without layout modification. SOT-563 is a smaller package. ES6 package used by Toshiba parts differs further. Mechanical compatibility requires PCB redesign or use of adapter solutions.

Q: What is the significance of the hFE (DC Current Gain) differences?

A: hFE determines transistor amplification and biasing behavior. PEMH13,115 specifies hFE minimum of 100 at 10mA, 5V. NSBC143ZDXV6T1G specifies 80 at 5mA, 10V; DDC143TH-7 specifies 100 at 1mA, 5V; RN1901FETE85LF specifies 30 at 10mA, 5V. Lower hFE values (RN1901FETE85LF) result in reduced amplification and may require circuit bias adjustment. Higher or equivalent hFE values maintain original circuit performance.

Q: Can DDC143TH-7 be used as a substitute if the emitter-base resistor value is not specified?

A: DDC143TH-7 specification does not provide the emitter-base resistor (R2) value. This parameter is critical for pre-biased transistor operation, affecting base current and switching characteristics. Without this specification, functional equivalence cannot be confirmed. NSBC143ZDXV6T1G and RN1901FETE85LF provide complete resistor specifications and are preferred for applications where precise biasing is required.

Q: What is the inventory status for each substitute part?

A: NSBC143ZDXV6T1G: 3854 units; DDC143TH-7: 5500 units; RN1901FETE85LF: 849 units; RN4906FE,LF(CT: 5031 units; RN4986FE,LF(CT: 4645 units. All parts are listed as New Original In Stock.

Q: Are all substitute parts RoHS3 compliant?

A: NSBC143ZDXV6T1G, DDC143TH-7, RN4906FE,LF(CT, and RN4986FE,LF(CT are ROHS3 compliant. RN1901FETE85LF is RoHS compliant (not specifically ROHS3). All parts meet environmental compliance requirements for standard manufacturing and deployment.

Q: Why is PEMH13,115 marked as "Not For New Designs"?

A: This designation indicates the part has been superseded by the manufacturer and is no longer recommended for new product development. Existing inventory remains available for legacy system support and maintenance. For new designs, active-status alternatives such as NSBC143ZDXV6T1G are recommended.

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