FFPF20U60STU Equivalent & Substitute Parts

Part Overview

The FFPF20U60STU is a general-purpose avalanche diode rated for 600 V DC reverse voltage and 20 A average rectified current in a through-hole TO-220-2 Full Pack configuration. Manufactured by onsemi, this component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement continuity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	20 A
Voltage - Forward (Vf) (Max) @ If	2.2 V @ 20 A
Reverse Recovery Time (trr)	90 ns
Current - Reverse Leakage @ Vr	10 µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	TO-220-2 Full Pack
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Avalanche

Substitute Part Grouping Explanation

Substitution of the FFPF20U60STU is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 20 A minimum
Mounting Type: Through Hole
Package / Case: TO-220 family configurations

Secondary Compatibility Factors:

Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): Performance characteristic
Forward Voltage (Vf): Operating characteristic at rated current
Reverse Leakage Current: Leakage characteristic at rated voltage
Operating Temperature Range: Junction temperature capability

Substitute parts are grouped into two categories:

Category 1: Direct Current Rating Match (20 A @ 600 V) Parts meeting or exceeding the 20 A current rating at 600 V reverse voltage with compatible through-hole TO-220 packaging.

Category 2: Lower Current Rating Alternatives (8 A - 15 A @ 600 V) Parts with reduced current ratings suitable for applications where the full 20 A capacity is not required, maintaining 600 V voltage rating and through-hole mounting.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	trr (ns)	Ir @ Vr	Package	Status
FFPF20U60STU	onsemi	600 V	20 A	2.2 V @ 20 A	90 ns	10 µA @ 600 V	TO-220-2	Obsolete
BYC20X-600PQ	WeEn Semiconductors	600 V	20 A	2.5 V @ 20 A	35 ns	10 µA @ 600 V	TO-220-2 Full Pack, Isolated Tab	Active
IDV15E65D2XKSA1	Infineon Technologies	650 V	15 A	2.2 V @ 15 A	47 ns	40 µA @ 650 V	TO-220-2	Active
MURF1560G	onsemi	600 V	15 A	1.5 V @ 15 A	60 ns	10 µA @ 600 V	TO-220-2 Full Pack	Active
STTH15AC06FP	STMicroelectronics	600 V	15 A	1.9 V @ 15 A	55 ns	2 µA @ 600 V	TO-220-2 Full Pack	Active
STTH15L06FP	STMicroelectronics	600 V	15 A	1.55 V @ 15 A	85 ns	15 µA @ 600 V	TO-220-2 Full Pack, Isolated Tab	Active
STTH12R06FP	STMicroelectronics	600 V	12 A	2.9 V @ 12 A	45 ns	45 µA @ 600 V	TO-220-2 Full Pack, Isolated Tab	Active
STTH12S06FP	STMicroelectronics	600 V	12 A	3.4 V @ 12 A	21 ns	30 µA @ 600 V	TO-220-2 Full Pack, Isolated Tab	Active
MURF860G	onsemi	600 V	8 A	1.5 V @ 8 A	60 ns	10 µA @ 600 V	TO-220-2 Full Pack	Active
BYC8X-600P,127	WeEn Semiconductors	600 V	8 A	1.9 V @ 8 A	18 ns	20 µA @ 600 V	TO-220-2 Full Pack, Isolated Tab	Active
MSRF860G	onsemi	600 V	8 A	1.7 V @ 8 A	120 ns	10 µA @ 600 V	TO-220-2 Full Pack	Obsolete

Engineering Selection Recommendations

Direct Equivalent (20 A @ 600 V):

The BYC20X-600PQ from WeEn Semiconductors is the primary equivalent substitute for the FFPF20U60STU. Both components share identical voltage and current ratings (600 V, 20 A) with compatible TO-220-2 Full Pack packaging. The BYC20X-600PQ is in active product status with RoHS3 compliance and REACH unaffected designation. Forward voltage is marginally higher (2.5 V vs. 2.2 V at rated current), and reverse recovery time is significantly faster (35 ns vs. 90 ns), representing improved performance characteristics. The component is available in high inventory quantities (13,148 pieces).

Alternative Selections (15 A @ 600 V):

For applications where 20 A capacity is not required, three 15 A alternatives are available:

The MURF1560G (onsemi) maintains manufacturer continuity with active product status, RoHS3 compliance, and superior forward voltage performance (1.5 V @ 15 A). Reverse recovery time is 60 ns with 10 µA leakage at rated voltage. Inventory availability is 20,000 pieces.

The STTH15AC06FP and STTH15L06FP (STMicroelectronics) both provide 600 V, 15 A ratings with active status and RoHS3 compliance. STTH15AC06FP exhibits lower reverse leakage (2 µA @ 600 V) and forward voltage of 1.9 V @ 15 A. STTH15L06FP offers the lowest forward voltage (1.55 V @ 15 A) among 15 A options with 85 ns recovery time matching the original part specification.

The IDV15E65D2XKSA1 (Infineon Technologies) provides elevated voltage rating (650 V) with 15 A current capacity, suitable for applications requiring additional voltage margin. RoHS3 compliant with active status.

Lower Current Alternatives (8 A @ 600 V):

The MURF860G (onsemi) and BYC8X-600P,127 (WeEn Semiconductors) provide 8 A ratings at 600 V with active product status. Both maintain through-hole TO-220 mounting and fast recovery characteristics. MURF860G offers 1.5 V forward voltage with 20,100 pieces in inventory. BYC8X-600P,127 provides faster recovery time (18 ns) with 4,400 pieces available.

The MSRF860G (onsemi) is an obsolete 8 A alternative and is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can the BYC20X-600PQ directly replace the FFPF20U60STU in existing designs?

A: Yes. Both components share identical voltage (600 V) and current (20 A) ratings with compatible TO-220-2 Full Pack through-hole packaging. The BYC20X-600PQ is in active product status, addressing the obsolescence of the FFPF20U60STU. Forward voltage and reverse recovery time differ slightly but remain within fast recovery classification specifications.

Q: What is the primary reason to select a 15 A substitute over the 20 A equivalent?

A: Selection of 15 A alternatives is appropriate when circuit design requirements do not demand the full 20 A capacity. The MURF1560G, STTH15AC06FP, and STTH15L06FP offer superior forward voltage performance (1.5 V to 1.9 V) compared to the original 2.2 V specification, resulting in reduced power dissipation and improved thermal efficiency in lower-current applications.

Q: Are there compliance or regulatory differences between substitute options?

A: All active substitute parts listed carry RoHS3 compliance and REACH unaffected designation. The FFPF20U60STU and MSRF860G are classified as obsolete. For new designs, active-status components are recommended to ensure long-term supply chain continuity and compliance with current regulatory requirements.

Q: How does reverse recovery time affect component selection?

A: Reverse recovery time (trr) characterizes the diode's switching speed. The FFPF20U60STU specifies 90 ns. Substitute parts range from 18 ns to 120 ns. Faster recovery times (lower trr values) reduce switching losses and electromagnetic interference in high-frequency applications. Slower recovery times may be acceptable in lower-frequency circuits where switching losses are not critical.

Q: What packaging considerations apply to these substitutes?

A: All listed components use through-hole TO-220 family packaging compatible with the FFPF20U60STU. Some variants include isolated tabs (TO-220-2 Full Pack, Isolated Tab) versus standard configurations. Isolated tab versions provide electrical isolation between the diode tab and mounting surface, relevant for thermal management and circuit isolation requirements. Verify PCB layout compatibility before substitution.

Q: Can an 8 A rated diode substitute for the 20 A FFPF20U60STU?

A: An 8 A diode is suitable only for applications where maximum circuit current does not exceed 8 A. The MURF860G and BYC8X-600P,127 maintain 600 V voltage rating and fast recovery characteristics but are current-limited. Use of an undersized component in a 20 A application results in thermal stress, reduced reliability, and potential component failure.

Q: What is the significance of forward voltage differences among substitutes?

A: Forward voltage (Vf) directly affects power dissipation and heat generation. The FFPF20U60STU specifies 2.2 V @ 20 A. The BYC20X-600PQ specifies 2.5 V @ 20 A, representing approximately 13.6% higher dissipation at rated current. Conversely, the STTH15L06FP specifies 1.55 V @ 15 A, representing lower dissipation in 15 A applications. Thermal design calculations must account for these differences.

Q: Is the IDV15E65D2XKSA1 with 650 V rating interchangeable with 600 V specifications?

A: The IDV15E65D2XKSA1 provides higher voltage rating (650 V) than the original specification (600 V). This component is suitable for applications where additional voltage margin is beneficial or required. The higher voltage rating does not create incompatibility; however, the reduced current rating (15 A vs. 20 A) must be verified against circuit requirements.

Q: What inventory considerations should influence substitute selection?

A: Current inventory levels are provided for procurement planning. The BYC20X-600PQ (13,148 pieces), MURF1560G (20,000 pieces), and MURF860G (20,100 pieces) offer substantial availability. The IDV15E65D2XKSA1 (1,571 pieces) and STTH15AC06FP (1,278 pieces) have limited inventory. For high-volume production, components with higher stock levels reduce supply chain risk.

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