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PEMD9,315 Pre-Biased Bipolar Transistor Equivalent & Substitute Parts
Part Overview
The PEMD9,315 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) to simplify circuit design in switching and logic applications. The part is rated for 50V collector-emitter breakdown voltage, 100mA maximum collector current, and 300mW power dissipation.
The PEMD9,315 carries a "Not For New Designs" product status, indicating that Nexperia has discontinued active development for this part number. This status necessitates identification of functionally equivalent alternatives from active product lines to ensure design continuity and long-term supply chain reliability.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Transistor Type | 1 NPN, 1 PNP - Pre-Biased (Dual) | — |
| Collector Current (Ic) Maximum | 100 | mA |
| Collector-Emitter Breakdown Voltage (Vceo) | 50 | V |
| Resistor - Base (R1) | 10 | kOhms |
| Resistor - Emitter Base (R2) | 47 | kOhms |
| Power Dissipation Maximum | 300 | mW |
| Mounting Type | Surface Mount | — |
| Package | SOT-666 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the PEMD9,315 is determined by the following critical parameters:
Primary Matching Criteria:
- Transistor configuration: 1 NPN, 1 PNP pre-biased dual structure
- Collector current rating: 100mA minimum
- Collector-emitter breakdown voltage: 50V minimum
- Base resistor (R1): 10kOhms
- Emitter-base resistor (R2): 47kOhms
- Surface mount packaging with SOT-563 or SOT-666 compatibility
Direct Equivalents: Parts meeting all primary criteria with identical internal resistor values enable pin-for-pin replacement without circuit modification. The NSBC114YPDXV6T1G (onsemi) qualifies as a direct equivalent, offering enhanced power rating (500mW vs. 300mW) and active product status.
Functional Alternatives: Parts with matching transistor configuration, voltage, and current ratings but differing internal resistor values require circuit evaluation. These alternatives include EMD4DXV6T1G (onsemi) and DCX114TH-7 (Diodes Incorporated), which maintain the 1 NPN/1 PNP configuration and 50V/100mA specifications.
Configuration Variants: Parts with 2 NPN pre-biased dual configuration (DDC114EH-7, DDC114YH-7, DDC143TH-7, DDC144EH-7) differ fundamentally in transistor type and are suitable only when circuit topology permits dual NPN operation. These parts are listed for reference but require design modification.
Parameter Comparison
| Parameter | PEMD9,315 | NSBC114YPDXV6T1G | DCX114TH-7 | EMD4DXV6T1G | DDC114YH-7 | DDC144EH-7 |
|---|---|---|---|---|---|---|
| Manufacturer | Nexperia USA Inc. | onsemi | Diodes Incorporated | onsemi | Diodes Incorporated | Diodes Incorporated |
| Transistor Type | 1 NPN, 1 PNP | 1 NPN, 1 PNP | 1 NPN, 1 PNP | 1 NPN, 1 PNP | 2 NPN | 2 NPN |
| Ic (Max) | 100 mA | 100 mA | 100 mA | 100 mA | 100 mA | 100 mA |
| Vceo (Max) | 50 V | 50 V | 50 V | 50 V | 50 V | 50 V |
| R1 (Base) | 10 kOhms | 10 kOhms | 10 kOhms | 10 kOhms, 47 kOhms | 10 kOhms | 47 kOhms |
| R2 (Emitter-Base) | 47 kOhms | 47 kOhms | — | 47 kOhms | 47 kOhms | 47 kOhms |
| Power (Max) | 300 mW | 500 mW | 150 mW | 500 mW | 150 mW | 150 mW |
| Package | SOT-666 | SOT-563 | SOT-563 | SOT-563 | SOT-563 | SOT-563 |
| Product Status | Not For New Designs | Active | Active | Active | Active | Active |
| 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) |
Engineering Selection Recommendations
Primary Recommendation: NSBC114YPDXV6T1G (onsemi)
The NSBC114YPDXV6T1G is the optimal substitute for the PEMD9,315. This part maintains identical transistor configuration (1 NPN, 1 PNP pre-biased dual), matching internal resistor values (R1: 10kOhms, R2: 47kOhms), and electrical ratings (50V, 100mA). The NSBC114YPDXV6T1G carries Active product status with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and supply chain continuity. The increased power rating (500mW vs. 300mW) provides additional thermal margin. Package transition from SOT-666 to SOT-563 requires PCB layout modification but maintains functional compatibility.
Secondary Recommendation: EMD4DXV6T1G (onsemi)
The EMD4DXV6T1G provides functional equivalence with 1 NPN/1 PNP configuration, 50V/100mA ratings, and 500mW power dissipation. Internal resistor configuration includes 47kOhms and 10kOhms values. Active product status and ROHS3 compliance support long-term design viability. This part is suitable when circuit topology accommodates variable base resistor values.
Alternative for Power-Constrained Applications: DCX114TH-7 (Diodes Incorporated)
The DCX114TH-7 maintains 1 NPN/1 PNP configuration with 50V/100mA ratings and 10kOhms base resistor. The 150mW power rating is lower than the PEMD9,315 and requires thermal evaluation in high-dissipation circuits. This part includes 250MHz transition frequency specification. Active product status and ROHS3 compliance are confirmed.
Not Recommended for Direct Substitution: DDC114YH-7, DDC144EH-7, DDC143TH-7
These Diodes Incorporated parts feature 2 NPN pre-biased dual configuration, fundamentally different from the PEMD9,315 (1 NPN, 1 PNP). Substitution requires circuit redesign and is not suitable for applications requiring PNP transistor functionality.
Frequently Asked Questions (FAQ)
Q: Can the NSBC114YPDXV6T1G replace the PEMD9,315 without circuit modification?
A: The NSBC114YPDXV6T1G provides electrical and functional equivalence with identical internal resistor values and transistor configuration. PCB layout modification is required due to package change from SOT-666 to SOT-563. No circuit schematic changes are necessary.
Q: What is the significance of the "Not For New Designs" status on the PEMD9,315?
A: This status indicates that Nexperia has concluded active development and support for this part number. Existing inventory may be available, but long-term supply cannot be guaranteed. Substitution with active-status alternatives (NSBC114YPDXV6T1G, EMD4DXV6T1G) is recommended for new designs and production continuity.
Q: Why do some substitute parts have different power ratings?
A: Power dissipation rating reflects the maximum thermal capability of the package and die design. The NSBC114YPDXV6T1G (500mW) and EMD4DXV6T1G (500mW) offer higher ratings than the PEMD9,315 (300mW), providing additional thermal margin. The DCX114TH-7 (150mW) has lower rating and requires thermal analysis for applications approaching the PEMD9,315 power limit.
Q: Are DDC114 and DDC143 series parts suitable substitutes?
A: DDC114 and DDC143 series parts feature 2 NPN pre-biased dual configuration, not 1 NPN/1 PNP. These parts are not suitable for direct substitution in circuits requiring PNP transistor functionality. Substitution requires complete circuit redesign.
Q: What is the impact of package change from SOT-666 to SOT-563?
A: SOT-563 is a smaller package than SOT-666. PCB footprint, trace routing, and component placement must be modified to accommodate the new package geometry. Electrical performance and pin functionality remain equivalent. Design files and manufacturing documentation require update.
Q: Do all substitute parts maintain ROHS3 compliance?
A: All substitute parts listed in this reference (NSBC114YPDXV6T1G, DCX114TH-7, EMD4DXV6T1G, DDC114YH-7, DDC144EH-7, DDC143TH-7) carry ROHS3 Compliant status. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, matching the PEMD9,315 specification.
Q: Can EMD4DXV6T1G be used if the circuit requires specific base resistor values?
A: The EMD4DXV6T1G includes dual base resistor values (47kOhms and 10kOhms). Circuit evaluation is required to confirm compatibility with the specific application. If the circuit requires only 10kOhms base resistance, the NSBC114YPDXV6T1G is the preferred choice.
Q: What inventory status should be considered when selecting a substitute?
A: Inventory levels are provided for reference only and reflect point-in-time availability. NSBC114YPDXV6T1G (145,400 pcs), DDC144EH-7 (72,300 pcs), and DDC143EH-7 (39,300 pcs) show strong availability. Long-term supply decisions should prioritize parts with Active product status rather than inventory quantity alone.
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