PEMD9,115 Equivalent & Substitute Parts

Part Overview

The PEMD9,115 is a pre-biased dual bipolar transistor (1 NPN, 1 PNP) manufactured by Nexperia USA Inc. in SOT-666 surface mount packaging. This component integrates internal biasing resistors (R1: 10kOhms, R2: 47kOhms) for simplified circuit design and reduced component count. The device is rated for 50V collector-emitter breakdown voltage, 100mA maximum collector current, and 300mW power dissipation.

The PEMD9,115 carries a product status of "Not For New Designs," indicating it is no longer recommended for new circuit development. Equivalent and substitute parts are necessary to support existing designs, provide alternative sourcing options, and enable migration to active product lines with improved availability and long-term support.

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
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 5mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	100mV @ 250µA, 5mA	—
Current - Collector Cutoff (Max)	1	µA
Power - Max	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 PEMD9,115 is determined by the following critical parameters:

Transistor Configuration: The PEMD9,115 contains 1 NPN and 1 PNP transistor pair with integrated biasing resistors. Direct substitutes must maintain this dual NPN/PNP configuration with identical or functionally equivalent internal resistor values (R1: 10kOhms, R2: 47kOhms).

Electrical Ratings: All substitute parts must meet or exceed the maximum collector current (100mA), collector-emitter breakdown voltage (50V), and power dissipation (300mW) specifications. Saturation voltage and current gain characteristics must be compatible with the original design operating point.

Internal Biasing Resistors: The base resistor (R1) and emitter-base resistor (R2) values are critical to circuit function. Substitutes with identical resistor values (10kOhms / 47kOhms) are direct replacements. Parts with different resistor configurations require circuit-level evaluation.

Package Compatibility: The PEMD9,115 is supplied in SOT-666 packaging. Substitutes may be available in SOT-563 or SOT-666 packages; however, physical footprint differences require PCB layout verification.

Compliance and Status: All substitute parts must maintain RoHS3 compliance and MSL Level 1 rating. Active product status is preferred for new sourcing; obsolete parts are listed for reference only.

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Ic Max (mA)	Vce Breakdown (V)	R1 (kOhms)	R2 (kOhms)	hFE Min @ Ic, Vce	Vce Sat Max (mV)	Power Max (mW)	Package	Product Status
PEMD9,115	Nexperia USA Inc.	1 NPN, 1 PNP	100	50	10	47	100 @ 5mA, 5V	100 @ 250µA, 5mA	300	SOT-666	Not For New Designs
NSBC114YPDXV6T1G	onsemi	1 NPN, 1 PNP	100	50	10	47	80 @ 5mA, 10V	250 @ 300µA, 10mA	500	SOT-563	Active
DCX114TH-7	Diodes Incorporated	1 NPN, 1 PNP	100	50	10	—	100 @ 1mA, 5V	300 @ 100µA, 1mA	150	SOT-563	Active
DDC114EH-7	Diodes Incorporated	2 NPN	100	50	10	10	30 @ 5mA, 5V	300 @ 500µA, 10mA	150	SOT-563	Active
DDC114TH-7	Diodes Incorporated	2 NPN	100	50	10	—	100 @ 1mA, 5V	300 @ 100µA, 1mA	150	SOT-563	Active
DDC114YH-7	Diodes Incorporated	2 NPN	100	50	10	47	68 @ 10mA, 5V	300 @ 250µA, 5mA	150	SOT-563	Active
DDC123JH-7	Diodes Incorporated	2 NPN	100	50	2.2	47	80 @ 10mA, 5V	300 @ 250µA, 5mA	150	SOT-563	Active
DDC124EH-7	Diodes Incorporated	2 NPN	100	50	22	22	56 @ 5mA, 5V	300 @ 500µA, 10mA	150	SOT-563	Active
DDC144EH-7	Diodes Incorporated	2 NPN	100	50	47	47	68 @ 5mA, 5V	300 @ 500µA, 10mA	150	SOT-563	Active
EMD4DXV6T1G	onsemi	1 NPN, 1 PNP	100	50	47, 10	47	80 @ 5mA, 10V	250 @ 300µA, 10mA	500	SOT-563	Active
EMD4DXV6T5G	onsemi	1 NPN, 1 PNP	100	50	47, 10	47	80 @ 5mA, 10V	250 @ 300µA, 10mA	500	SOT-563	Obsolete

Engineering Selection Recommendations

Direct Functional Equivalent (Preferred for Existing Designs):

NSBC114YPDXV6T1G (onsemi) is the primary direct substitute for PEMD9,115. Both devices feature identical transistor configuration (1 NPN, 1 PNP), matching internal resistor values (R1: 10kOhms, R2: 47kOhms), and equivalent electrical ratings (100mA Ic, 50V Vce breakdown). NSBC114YPDXV6T1G is Active product status with higher power rating (500mW vs. 300mW), providing improved thermal margin. Package transition from SOT-666 to SOT-563 requires PCB footprint verification but maintains electrical compatibility.

Alternative Substitutes with Configuration Differences:

Parts designated as 2 NPN (DDC114EH-7, DDC114TH-7, DDC114YH-7, DDC123JH-7, DDC124EH-7, DDC144EH-7) contain dual NPN transistors rather than NPN/PNP pairs. These are suitable only for applications requiring two independent NPN stages. Selection among these variants depends on internal resistor configuration: DDC114YH-7 matches the PEMD9,115 resistor values (R1: 10kOhms, R2: 47kOhms) and is recommended for direct circuit replacement.

Compliance and Sourcing:

All recommended substitutes maintain RoHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage requirements. Active product status (NSBC114YPDXV6T1G, DDC114YH-7, EMD4DXV6T1G) ensures long-term availability and supply chain stability. EMD4DXV6T5G is marked Obsolete and should be avoided for new sourcing despite current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can NSBC114YPDXV6T1G directly replace PEMD9,115 without circuit modification?

A: NSBC114YPDXV6T1G is electrically equivalent to PEMD9,115 with identical transistor configuration and internal resistor values. The primary difference is package format (SOT-563 vs. SOT-666). PCB layout must be verified to confirm footprint compatibility. Electrical performance is maintained across the specified operating range.

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

A: PEMD9,115 contains one NPN transistor and one PNP transistor integrated on a single die with shared biasing resistors. This configuration is suitable for complementary switching or push-pull driver applications. Parts designated 2 NPN (such as DDC114EH-7) contain two independent NPN transistors and are not functionally equivalent for circuits requiring PNP functionality. Selection must match the original circuit topology.

Q: Why does NSBC114YPDXV6T1G have higher power rating (500mW vs. 300mW)?

A: Power rating reflects the maximum thermal dissipation capability of the package and die design. Higher power rating indicates improved thermal performance but does not change electrical operating characteristics. The 500mW rating of NSBC114YPDXV6T1G provides additional thermal margin without affecting circuit function at the PEMD9,115 operating point.

Q: Are there package compatibility issues when substituting SOT-666 with SOT-563?

A: SOT-666 and SOT-563 are distinct surface mount packages with different footprints and pin configurations. Physical PCB layout must be verified before substitution. Pin-to-pin electrical function is maintained, but printed circuit board redesign may be required. Consult package datasheets for dimensional specifications and land pattern requirements.

Q: What is the significance of internal resistor values (R1, R2) in pre-biased transistors?

A: Internal resistors establish the DC bias point and switching characteristics of the pre-biased transistor. R1 (base resistor) and R2 (emitter-base resistor) determine the transistor gain and saturation behavior. Identical resistor values ensure equivalent circuit performance. Parts with different resistor configurations (e.g., DDC123JH-7 with R1: 2.2kOhms) produce different bias conditions and are not direct substitutes.

Q: Why is PEMD9,115 marked "Not For New Designs"?

A: Product status "Not For New Designs" indicates the manufacturer has discontinued active development and recommends migration to alternative parts for new circuit development. Existing designs may continue to use PEMD9,115 if inventory is available. NSBC114YPDXV6T1G and DDC114YH-7 are recommended alternatives with Active status and assured long-term availability.

Q: Can EMD4DXV6T5G be used as a substitute despite Obsolete status?

A: EMD4DXV6T5G is electrically equivalent to PEMD9,115 and current inventory is available (45,200 pcs). However, Obsolete product status indicates no future manufacturing or support. Use is acceptable for existing design support or short-term production runs, but Active alternatives (NSBC114YPDXV6T1G, EMD4DXV6T1G) are preferred for supply chain continuity.

Q: What compliance certifications apply to substitute parts?

A: All listed substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the PEMD9,115 specifications. REACH status is "REACH Unaffected" for all parts. ECCN classification is EAR99 for all devices. These certifications ensure compatibility with standard manufacturing, storage, and export requirements.

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