STF12PF06 MOSFET P-Channel 60V 8A Equivalent & Substitute Parts

Part Overview

The STF12PF06 is a P-Channel MOSFET manufactured by STMicroelectronics, rated for 60V drain-to-source voltage and 8A continuous drain current in a Through Hole TO-220FP package. This device is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and production continuity. The STripFET™ II series component delivers 225W maximum power dissipation and operates across the industrial temperature range of -55°C to 175°C.

Substitute parts must maintain electrical compatibility across voltage ratings, current handling, gate threshold characteristics, and thermal operating parameters while accommodating package form factor variations between TO-220FP and TO-220-3 configurations.

Substiute Parts

STF12PF06

STMicroelectronicsIn Stock: 15203STF12PF06 Datasheet

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IRFI9Z24GPBF

Vishay SiliconixIn Stock: 2338IRFI9Z24GPBF Datasheet

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IRFI9Z34GPBF

Vishay SiliconixIn Stock: 6759IRFI9Z34GPBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STF12PF06 is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Criteria:

• FET Type: P-Channel topology
• Drain to Source Voltage (Vdss): 60V minimum rating
• Gate Threshold Voltage (Vgs(th)): 4V @ 250µA maximum
• Maximum Gate Voltage (Vgs): ±20V
• Operating Temperature Range: -55°C to 175°C
• Mounting Type: Through Hole
• Package Form Factor: TO-220 series (TO-220FP or TO-220-3)

Allowable Variation Parameters:

• Continuous Drain Current (Id): Equal to or greater than 8A
• On-State Resistance (Rds On): Equal to or lower than 200 mOhm (at specified conditions)
• Gate Charge (Qg): Equal to or lower than 21 nC
• Input Capacitance (Ciss): Equal to or lower than 850 pF
• Power Dissipation: Equal to or greater than 225W

The identified substitute parts IRFI9Z24GPBF and IRFI9Z34GPBF from Vishay Siliconix satisfy all mandatory criteria and demonstrate improved or equivalent performance in allowable variation parameters.

Parameter Comparison

Engineering Selection Recommendations

IRFI9Z24GPBF Selection Criteria:

The IRFI9Z24GPBF is an active product from Vishay Siliconix with ROHS3 compliance and unlimited moisture sensitivity rating. This substitute provides 8.5A continuous drain current, exceeding the STF12PF06 minimum requirement of 8A. Gate charge is reduced to 19 nC, and input capacitance is lower at 570 pF, resulting in improved switching characteristics. The on-state resistance of 280 mOhm is higher than the original specification, which may impact thermal performance in high-current applications. Power dissipation rating of 37W is substantially lower than the original 225W, indicating reduced thermal capability. This substitute is suitable for applications where current demands do not exceed 8.5A and thermal dissipation requirements remain moderate.

IRFI9Z34GPBF Selection Criteria:

The IRFI9Z34GPBF is an active product from Vishay Siliconix with ROHS3 compliance and unlimited moisture sensitivity rating. This substitute provides 12A continuous drain current, significantly exceeding the STF12PF06 requirement. On-state resistance is improved at 140 mOhm, delivering superior conductivity and reduced power loss. Gate charge increases to 34 nC, requiring higher drive circuit capability. Input capacitance rises to 1100 pF, which may affect switching speed in sensitive applications. Power dissipation rating of 42W remains substantially lower than the original 225W specification. This substitute is suitable for applications requiring higher current handling and lower on-state resistance, provided thermal management accommodates the reduced power dissipation rating.

Compliance and Regulatory Status:

Both substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity, ensuring compatibility with standard manufacturing and storage protocols. Both are classified as active products with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can IRFI9Z24GPBF or IRFI9Z34GPBF be used as direct pin-for-pin replacements for STF12PF06?

A: Both substitute parts feature TO-220-3 package configurations with isolated tabs, compatible with standard TO-220 through-hole PCB layouts. Pin assignments for P-Channel MOSFETs in TO-220 packages are standardized (Gate, Drain, Source). Physical mounting is compatible; however, the isolated tab feature on substitute parts may require PCB layout verification if thermal management relies on tab-to-ground connections.

Q: What are the key electrical differences between the two substitute options?

A: IRFI9Z24GPBF provides 8.5A current rating with 280 mOhm on-state resistance and 19 nC gate charge. IRFI9Z34GPBF provides 12A current rating with 140 mOhm on-state resistance and 34 nC gate charge. The IRFI9Z34GPBF offers superior conductivity and current capacity at the cost of increased gate charge and input capacitance. Selection depends on application current requirements and drive circuit capabilities.

Q: How do power dissipation ratings affect substitution suitability?

A: The STF12PF06 specifies 225W maximum power dissipation, while both substitutes are rated at 37W and 42W respectively. This represents a significant reduction in thermal capability. Applications requiring sustained high-power operation or elevated ambient temperatures may exceed the thermal limits of substitute parts. Thermal analysis of the specific application is necessary to confirm suitability.

Q: Are there package compatibility concerns between TO-220FP and TO-220-3?

A: TO-220FP (Full Pack) and TO-220-3 (Full Pack with Isolated Tab) are both through-hole TO-220 variants with compatible pin spacing and mounting hole patterns. The isolated tab feature on substitute parts provides additional thermal management flexibility. PCB footprints designed for standard TO-220 packages accommodate both variants without modification.

Q: Do the substitute parts maintain the same gate threshold voltage?

A: Yes. Both IRFI9Z24GPBF and IRFI9Z34GPBF specify Vgs(th) (Max) of 4V @ 250µA, identical to the STF12PF06. Gate drive circuits designed for the original part operate within specification for both substitutes.

Q: What is the significance of gate charge differences?

A: Gate charge (Qg) determines the energy required to switch the MOSFET on and off. The STF12PF06 specifies 21 nC, IRFI9Z24GPBF specifies 19 nC (lower, faster switching), and IRFI9Z34GPBF specifies 34 nC (higher, slower switching). Drive circuits must supply sufficient charge to achieve specified switching performance. Higher gate charge may require increased driver output current or extended switching times.

Q: Are both substitute parts suitable for high-frequency switching applications?

A: IRFI9Z24GPBF exhibits lower gate charge (19 nC) and input capacitance (570 pF), supporting faster switching transitions. IRFI9Z34GPBF exhibits higher gate charge (34 nC) and input capacitance (1100 pF), resulting in slower switching characteristics. Application frequency requirements determine which substitute is appropriate.

Q: What compliance certifications apply to all parts in this comparison?

A: All three parts (STF12PF06, IRFI9Z24GPBF, IRFI9Z34GPBF) are ROHS3 compliant and carry MSL Level 1 (Unlimited) moisture sensitivity ratings. Both substitute parts are REACH Unaffected and classified under ECCN EAR99 with HTSUS code 8541.29.0095, matching the regulatory classification of the original part.