SD1274 RF Transistor NPN Equivalent & Substitute Parts

Part Overview

The SD1274 is an RF Transistor NPN manufactured by STMicroelectronics, rated for 16V collector-emitter breakdown voltage with 70W maximum power dissipation and 8A maximum collector current. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. The part is housed in an M135 surface mount package and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Substiute Parts

SD1274

STMicroelectronicsIn Stock: 1006SD1274 Datasheet

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BFP182RE7764HTSA1

Infineon TechnologiesIn Stock: 731BFP182RE7764HTSA1 Datasheet

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BFP740FH6327XTSA1

Infineon TechnologiesIn Stock: 4317BFP740FH6327XTSA1 Datasheet

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BFR193WH6327XTSA1

Infineon TechnologiesIn Stock: 3433BFR193WH6327XTSA1 Datasheet

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MAPRST0912-350

MACOM Technology SolutionsIn Stock: 823MAPRST0912-350 Datasheet

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PH1090-550S

MACOM Technology SolutionsIn Stock: 815PH1090-550S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SD1274 are identified based on strict alignment with the following critical parameters:

Primary Substitution Criteria:

• Transistor Type: NPN configuration
• Voltage Rating: Collector-Emitter Breakdown voltage equal to or exceeding 16V
• Power Dissipation: Maximum power rating equal to or exceeding 70W
• Current Capability: Maximum collector current equal to or exceeding 8A
• Mounting Type: Surface Mount configuration
• Compliance: ROHS3 compliance and unlimited MSL rating

Substitution Groups:

Group 1: High-Power Chassis Mount Alternatives Parts MAPRST0912-350 and PH1090-550S are high-power RF transistors with significantly elevated voltage and current ratings. These parts exceed the SD1274 specifications in power dissipation (350W and 550W respectively) and current handling (32.5A and 28A respectively). These are suitable for applications requiring higher power margins or operating at elevated voltage levels (65V and 80V respectively).

Group 2: Surface Mount RF Alternatives Parts BFP182RE7764HTSA1, BFR193WH6327XTSA1, and BFP740FH6327XTSA1 are surface mount RF transistors manufactured by Infineon Technologies. These parts maintain surface mount packaging and ROHS3 compliance. However, these parts operate at reduced power levels (250mW to 580mW) and reduced collector current ratings (30mA to 80mA) compared to the SD1274, making them suitable only for lower-power RF applications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Surface Mount Replacement: No direct equivalent exists among the provided substitute parts. The Infineon surface mount alternatives (BFP182RE7764HTSA1, BFR193WH6327XTSA1, BFP740FH6327XTSA1) are classified as active products with current availability and ROHS3 compliance. However, these parts operate at significantly reduced power levels and collector current ratings, limiting their applicability to lower-power RF circuit designs.

For High-Power Applications: MAPRST0912-350 and PH1090-550S are active products suitable for applications requiring power dissipation exceeding the SD1274 specification. Both parts maintain 200°C operating temperature capability and ROHS3 compliance. These parts transition from surface mount to chassis mount packaging, requiring circuit board layout modifications. MAPRST0912-350 provides 350W power dissipation at 65V rating, while PH1090-550S provides 550W power dissipation at 80V rating.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring regulatory alignment with the original SD1274 specification. All parts carry EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can BFP182RE7764HTSA1, BFR193WH6327XTSA1, or BFP740FH6327XTSA1 directly replace the SD1274 in existing designs?

A: These parts cannot serve as direct replacements for applications requiring the full 70W power dissipation and 8A collector current of the SD1274. These Infineon alternatives operate at maximum power levels of 250mW to 580mW with collector currents of 30mA to 80mA. They are suitable only for lower-power RF applications operating at reduced voltage and current levels.

Q: What are the key differences between surface mount and chassis mount alternatives?

A: The SD1274 uses surface mount packaging (M135), enabling integration into standard PCB assembly processes. MAPRST0912-350 and PH1090-550S employ chassis mount configurations, requiring direct mechanical attachment to heat sinks or chassis structures. This transition necessitates significant circuit board redesign and thermal management modifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (BFP182RE7764HTSA1, BFR193WH6327XTSA1, BFP740FH6327XTSA1, MAPRST0912-350, PH1090-550S) maintain ROHS3 compliance and unlimited moisture sensitivity rating, matching the regulatory status of the SD1274.

Q: What is the operating temperature capability of substitute parts?

A: Infineon surface mount alternatives (BFP182RE7764XTSA1, BFR193WH6327XTSA1, BFP740FH6327XTSA1) operate at maximum junction temperatures of 150°C. MACOM chassis mount alternatives (MAPRST0912-350, PH1090-550S) operate at maximum junction temperatures of 200°C, matching the SD1274 specification.

Q: Can MAPRST0912-350 or PH1090-550S be used in applications requiring surface mount packaging?

A: No. MAPRST0912-350 and PH1090-550S employ chassis mount configurations and cannot be integrated into standard surface mount PCB assemblies without substantial circuit redesign and thermal management modifications.

Q: What voltage ratings apply to each substitute part?

A: BFP182RE7764HTSA1 and BFR193WH6327XTSA1 are rated for 12V collector-emitter breakdown voltage, below the SD1274 16V rating. BFP740FH6327XTSA1 is rated for 4.7V, significantly below the SD1274 specification. MAPRST0912-350 is rated for 65V, and PH1090-550S is rated for 80V, both exceeding the SD1274 16V specification.

Q: Are substitute parts currently in production?

A: Yes. All substitute parts are classified as active products with current manufacturing status. The SD1274 is classified as obsolete, making active substitute identification necessary for design continuity.