PEMD4,115 Pre-Biased Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The PEMD4,115 is a pre-biased dual bipolar transistor (BJT) manufactured by Nexperia USA Inc., configured as 1 NPN and 1 PNP transistor pair in a surface mount SOT-666 package. This component integrates internal biasing resistors to simplify circuit design in switching and logic applications. The part carries a "Not For New Designs" status, indicating that while functional and available in inventory, it has been superseded in the manufacturer's product roadmap. Identifying equivalent and substitute parts is necessary for design continuity, long-term supply assurance, and transition to active product lines.

Substiute Parts

PEMD4,115

Nexperia USA Inc.In Stock: 1092PEMD4,115 Datasheet

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NSBC114TDXV6T1G

onsemiIn Stock: 4314NSBC114TDXV6T1G Datasheet

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NSBC114TDXV6T5G

onsemiIn Stock: 40308NSBC114TDXV6T5G Datasheet

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NSBC114TPDXV6T1G

onsemiIn Stock: 1065NSBC114TPDXV6T1G Datasheet

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RN1911FETE85LF

Toshiba Semiconductor and StorageIn Stock: 884RN1911FETE85LF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PEMD4,115 is determined by the following critical parameters:

Configuration Match: The transistor type (1 NPN, 1 PNP pre-biased dual) is the primary substitution criterion. Parts with identical configuration maintain functional equivalence in complementary switching circuits.

Electrical Ratings: Maximum collector current (100 mA), collector-emitter breakdown voltage (50 V), and maximum power dissipation (300 mW minimum) must be met or exceeded by substitute parts.

Biasing Resistor Value: The base resistor (R1) of 10 kOhms is a fixed internal component that defines the pre-bias network. Substitutes must maintain this value for circuit compatibility.

Package Compatibility: The SOT-666 package footprint is the primary mounting specification. Substitutes available in SOT-563 or SOT-666 packages are mechanically compatible with appropriate PCB layout considerations.

Compliance Standards: RoHS3 compliance and MSL Level 1 are required for environmental and handling compatibility.

Product Status: Active product status is preferred for long-term supply continuity, though obsolete parts may serve as interim substitutes if electrical parameters align.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute - NSBC114TPDXV6T1G (onsemi): This part provides the closest functional match to the PEMD4,115. It maintains the identical 1 NPN, 1 PNP pre-biased dual configuration, 100 mA collector current rating, 50 V breakdown voltage, and 10 kOhms base resistor. The part carries Active product status, ensuring long-term availability and supply continuity. ROHS3 compliance and MSL Level 1 rating match the original specification. The SOT-563 package requires PCB layout adjustment from the SOT-666 footprint but maintains electrical compatibility. This substitute is recommended for new designs transitioning from the PEMD4,115.

Secondary Substitute - NSBC114TDXV6T1G (onsemi): This part meets all critical electrical parameters (100 mA, 50 V, 10 kOhms base resistor) and carries Active product status. The configuration differs as a 2 NPN dual transistor rather than 1 NPN/1 PNP. This substitute applies only to circuits requiring dual NPN functionality. ROHS3 compliance and MSL Level 1 rating are maintained. SOT-563 package footprint applies.

Interim Substitute - NSBC114TDXV6T5G (onsemi): This part is electrically identical to NSBC114TDXV6T1G but carries Obsolete product status. It is suitable only for short-term supply continuity or repair applications where long-term availability is not required. The 2 NPN configuration limits applicability to dual NPN circuits only.

Alternative Substitute - RN1911FETE85LF (Toshiba): This part meets core electrical parameters (100 mA, 50 V, 10 kOhms base resistor) and carries Active product status. The 2 NPN configuration restricts use to dual NPN applications. The ES6 package differs from SOT-666 and SOT-563, requiring custom PCB layout. The 100 mW maximum power rating is lower than the PEMD4,115 (300 mW), limiting applicability to lower-power circuits. The 250 MHz transition frequency provides enhanced switching performance for high-speed applications. RoHS compliance is confirmed.

Frequently Asked Questions (FAQ)

Q: Can NSBC114TPDXV6T1G directly replace PEMD4,115 without circuit modification?

A: The NSBC114TPDXV6T1G maintains electrical equivalence in all critical parameters (configuration, current rating, voltage rating, base resistor value). However, the package changes from SOT-666 to SOT-563, requiring PCB footprint modification. No circuit schematic changes are necessary if the PCB layout accommodates the new package.

Q: Why do some substitute parts have 2 NPN configuration instead of 1 NPN/1 PNP?

A: The NSBC114TDXV6T1G and RN1911FETE85LF are 2 NPN pre-biased dual transistors. These parts are suitable only for circuits requiring dual NPN functionality. They cannot replace the PEMD4,115 in applications requiring complementary NPN/PNP switching pairs. The NSBC114TPDXV6T1G is the only substitute maintaining the 1 NPN/1 PNP configuration.

Q: What is the impact of the SOT-563 package change from SOT-666?

A: SOT-563 and SOT-666 are both surface mount packages with different physical dimensions and pin layouts. PCB footprint, trace routing, and component placement must be redesigned to accommodate SOT-563. Electrical performance is not affected. Consult package datasheets for precise dimensional specifications.

Q: Is NSBC114TDXV6T5G suitable for new designs?

A: No. NSBC114TDXV6T5G carries Obsolete product status, indicating discontinued manufacturing and limited future availability. It is suitable only for repair, rework, or interim supply solutions. For new designs, use NSBC114TDXV6T1G or NSBC114TPDXV6T1G, both carrying Active status.

Q: How do the DC current gain (hFE) differences affect circuit performance?

A: The PEMD4,115 specifies hFE minimum of 200 @ 1mA, 5V. Substitute parts specify lower hFE values (160 @ 5mA, 10V for onsemi parts; 120 @ 1mA, 5V for Toshiba). Lower hFE requires higher base current to achieve saturation. Circuit designs with tight base current budgets may require bias resistor adjustment. Verify saturation conditions in the application circuit.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry either ROHS3 Compliant or RoHS Compliant status, meeting environmental and hazardous substance restrictions. MSL Level 1 (Unlimited) moisture sensitivity is maintained across all parts, requiring no special handling modifications.

Q: What is the significance of the 250 MHz transition frequency in RN1911FETE85LF?

A: The RN1911FETE85LF specifies 250 MHz transition frequency, indicating enhanced high-frequency switching capability. The PEMD4,115 does not specify transition frequency. The Toshiba part is suitable for applications requiring faster switching speeds. However, the 100 mW maximum power rating is significantly lower than the PEMD4,115 (300 mW), restricting use to lower-power circuits.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: No. Substitutes differ in transistor configuration (1 NPN/1 PNP versus 2 NPN), package type (SOT-563 versus ES6), and electrical characteristics (hFE, saturation voltage, power rating). Each substitute is selected based on specific circuit requirements. Verify configuration, package compatibility, and electrical parameters before substitution.