PD55035-E RF MOSFET LDMOS Equivalent & Substitute Parts

Part Overview

The PD55035-E is an RF MOSFET LDMOS transistor manufactured by STMicroelectronics, designed for RF power amplification applications at 500 MHz. This device operates at 12.5 V test voltage with 35 W output power and 16.9 dB gain in a PowerSO-10RF package with formed leads and exposed bottom pad. The PD55035-E is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and production continuity. Equivalent parts must maintain electrical performance within the RF frequency band while accommodating packaging and lead configuration differences.

Substiute Parts

PD55035-E

STMicroelectronicsIn Stock: 1190PD55035-E Datasheet

Current PartRFQ

PD55025S-E

STMicroelectronicsIn Stock: 1318PD55025S-E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the PD55035-E is based on the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Technology: LDMOS (Laterally Diffused Metal Oxide Semiconductor)
• Operating Frequency: 500 MHz
• Test Voltage: 12.5 V
• Rated Voltage: 40 V maximum
• Current Rating: 7 A
• Test Current: 200 mA

Mechanical Compatibility Criteria:

• Package Family: PowerSO-10RF (both formed and straight lead variants acceptable)
• Exposed Bottom Pad: Required
• Lead Configuration: Formed or straight leads

Compliance & Environmental Criteria:

• RoHS3 Compliance: Required
• MSL Rating: 3 (168 Hours)
• REACH Status: REACH Unaffected

The substitute part PD55025S-E maintains identical technology, frequency, test voltage, rated voltage, current ratings, and compliance certifications. The primary differences are output power (25 W versus 35 W) and gain (14.5 dB versus 16.9 dB), with lead configuration changed from formed to straight. These differences are within the PowerSO-10RF package family and do not prevent functional substitution in applications where the lower power output and gain are acceptable.

Parameter Comparison

Engineering Selection Recommendations

PD55035-E Status: Obsolete. Direct replacement with identical specifications is not available from STMicroelectronics.

PD55025S-E Selection Basis:

The PD55025S-E is an active product from STMicroelectronics and serves as the functional equivalent for the obsolete PD55035-E. Both devices share identical LDMOS technology, 500 MHz operating frequency, 12.5 V test voltage, 40 V rated voltage, and 7 A current rating. Both maintain ROHS3 compliance and identical MSL ratings, ensuring compatibility with current manufacturing and environmental standards.

The PD55025S-E differs in output power specification (25 W versus 35 W) and gain (14.5 dB versus 16.9 dB). These differences reflect the device's position within the STMicroelectronics RF MOSFET product line and do not affect package compatibility or thermal management approach. The PowerSO-10RF package family accommodates both formed and straight lead configurations without requiring PCB redesign.

Selection of PD55025S-E is appropriate for applications where the specified 25 W output power and 14.5 dB gain meet system requirements. Applications requiring the full 35 W output power and 16.9 dB gain of the original PD55035-E must evaluate alternative RF MOSFET solutions from the broader market.

Frequently Asked Questions (FAQ)

Q: Can the PD55025S-E directly replace the PD55035-E without PCB modifications?

A: The PD55025S-E uses the PowerSO-10RF package family with straight leads, while the PD55035-E uses formed leads. Both packages share the same footprint and pin configuration. PCB layout compatibility depends on lead forming specifications in the original design. Consult PCB assembly documentation to confirm lead bend radius and contact point compatibility.

Q: What is the primary difference between these two parts?

A: The PD55025S-E delivers 25 W output power with 14.5 dB gain, compared to the PD55035-E's 35 W output power with 16.9 dB gain. All other electrical parameters, including frequency, voltage ratings, and current ratings, are identical. The PD55025S-E is an active product, while the PD55035-E is obsolete.

Q: Are both parts RoHS compliant?

A: Yes. Both the PD55035-E and PD55025S-E are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What does MSL 3 (168 Hours) mean for storage and handling?

A: MSL 3 indicates Moisture Sensitivity Level 3. The device can be exposed to ambient conditions (30°C, 60% relative humidity) for a maximum of 168 hours before soldering. After this period, the component must be baked according to IPC-A-113 specifications before assembly.

Q: Can I use the PD55025S-E in an application designed for 35 W output?

A: The PD55025S-E is rated for 25 W output power. Use in applications requiring 35 W output power will result in operation outside the device's specified power rating and may cause thermal stress or failure. Applications requiring 35 W output must identify alternative RF MOSFET components with matching power specifications.

Q: Are there any frequency limitations when substituting these parts?

A: Both parts operate at 500 MHz. No frequency limitations apply to substitution within this frequency band. Applications operating outside the 500 MHz specification require evaluation of alternative components.