FFH50US60S Equivalent & Substitute Parts

Part Overview

The FFH50US60S is a general-purpose rectifier diode manufactured by onsemi, rated for 600 V DC reverse voltage and 50 A average rectified current in a TO-247-2 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. The diode features fast recovery characteristics with a reverse recovery time of 124 ns and operates across a junction temperature range of -55°C to 175°C. Substitution is required due to the obsolete product status while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	50	A
Voltage - Forward (Vf) (Max) @ If	1.54 V @ 50 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	124	ns
Current - Reverse Leakage @ Vr	100 µA @ 600 V	µA
Mounting Type	Through Hole	—
Package / Case	TO-247-2	—
Operating Temperature - Junction	-55 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the FFH50US60S is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a maximum DC reverse voltage (Vr) of 600 V to ensure safe operation in the original circuit.

Current Rating: Substitute parts are grouped by average rectified current (Io) capacity. Parts rated at 50 A or higher are direct functional equivalents. Parts rated below 50 A (such as 30 A or 20 A variants) are considered downgrades and are listed for reference only when current derating is acceptable.

Speed Classification: The FFH50US60S operates as a fast recovery diode with reverse recovery time ≤ 500 ns. Substitute parts must maintain fast recovery characteristics to preserve circuit switching performance and minimize switching losses.

Package and Mounting: All substitute parts use through-hole mounting in TO-247-2 or compatible variants (TO-247AD, DO-247). Physical compatibility with PCB layouts is maintained across these package types.

Temperature Range: Operating junction temperature range of -55°C to 175°C is the baseline specification. Substitute parts with equal or extended temperature ranges are acceptable.

Compliance: All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original part.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Package	Tj (°C)	Product Status
FFH50US60S	onsemi	600	50	1.54 @ 50 A	124	100 @ 600 V	TO-247-2	-55 to 175	Obsolete
PSDH6060S1_T0_00001	Panjit International Inc.	600	60	2.3 @ 60 A	85	250 @ 600 V	TO-247-2	-55 to 150	Active
DSEP60-06A	IXYS	600	60	2.04 @ 60 A	35	650 @ 600 V	TO-247-2	-55 to 175	Active
STTH60L06W	STMicroelectronics	600	60	1.55 @ 60 A	105	50 @ 600 V	DO-247-2	Max 175	Active
STTH6006W	STMicroelectronics	600	60	1.85 @ 60 A	85	50 @ 600 V	DO-247-2	Max 175	Active
DSEI60-06A	IXYS	600	60	1.8 @ 70 A	50	200 @ 600 V	TO-247-2	-40 to 150	Active
APT30D60BG	Microchip Technology	600	30	1.8 @ 30 A	85	250 @ 600 V	TO-247-2	-55 to 175	Active
VS-30EPH06-N3	Vishay General Semiconductor - Diodes Division	600	30	2.6 @ 30 A	31	50 @ 600 V	TO-247-2	-65 to 175	Active
DHG20I600HA	IXYS	600	20	2.24 @ 20 A	40	25 @ 600 V	TO-247-2	-55 to 150	Active
DHG60I600HA	IXYS	600	60	—	—	—	TO-247-2	-55 to 150	Active

Engineering Selection Recommendations

Direct Equivalents (50 A or Higher Current Rating):

The following parts are active alternatives with current ratings equal to or exceeding the FFH50US60S specification of 50 A:

STTH60L06W and STTH6006W (STMicroelectronics) are active 60 A rated diodes with 600 V reverse voltage and fast recovery characteristics. Both maintain the full -55°C to 175°C operating temperature range. STTH60L06W exhibits forward voltage of 1.55 V at 60 A, closely matching the original part's 1.54 V specification. Package compatibility is confirmed through DO-247-2 (straight leads), which is mechanically compatible with TO-247-2 layouts.

DSEP60-06A (IXYS HiPerFRED™ series) is a 60 A rated diode with 600 V reverse voltage and fast recovery characteristics. This part maintains the full -55°C to 175°C operating temperature range and ROHS3 compliance. Forward voltage is 2.04 V at 60 A.

PSDH6060S1_T0_00001 (Panjit International Inc.) is a 60 A rated diode with 600 V reverse voltage and fast recovery characteristics. Operating temperature range is -55°C to 150°C. Forward voltage is 2.3 V at 60 A.

DSEI60-06A (IXYS) is a 60 A rated diode with 600 V reverse voltage and fast recovery characteristics. Operating temperature range is -40°C to 150°C. Forward voltage is 1.8 V at 70 A.

Reduced Current Rating Alternatives (Below 50 A):

APT30D60BG (Microchip Technology) and VS-30EPH06-N3 (Vishay) are 30 A rated diodes with 600 V reverse voltage. These parts are suitable only for applications where circuit current requirements do not exceed 30 A. Both maintain ROHS3 compliance and fast recovery characteristics.

DHG20I600HA (IXYS) is a 20 A rated diode with 600 V reverse voltage. This part is suitable only for applications where circuit current requirements do not exceed 20 A.

DHG60I600HA (IXYS) is a 60 A rated diode with 600 V reverse voltage. This part operates at standard recovery speed (>500 ns), which differs from the fast recovery classification of the original FFH50US60S.

Compliance and Certification:

All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original FFH50US60S specification. All parts are classified as active products, ensuring ongoing availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can STTH60L06W or STTH6006W be used as direct replacements for FFH50US60S?

A: Yes. Both STMicroelectronics parts are rated for 600 V reverse voltage and 60 A average rectified current, exceeding the original 50 A specification. Both maintain fast recovery characteristics and the full -55°C to 175°C operating temperature range. Package compatibility is confirmed through DO-247-2 (straight leads), which is mechanically compatible with TO-247-2 PCB layouts. Forward voltage characteristics are comparable: STTH60L06W at 1.55 V and STTH6006W at 1.85 V, both near the original 1.54 V specification.

Q: What is the difference between TO-247-2 and DO-247-2 packages?

A: Both packages are through-hole mounted rectifier diodes with identical pin configurations and mechanical footprints. DO-247-2 (straight leads) and TO-247-2 are compatible for PCB layout purposes. The primary distinction is in lead geometry and supplier designation; both are suitable for the same circuit applications.

Q: Can I use a 30 A rated diode (APT30D60BG or VS-30EPH06-N3) in place of the 50 A FFH50US60S?

A: Only if the circuit current requirement does not exceed 30 A. The 30 A rated parts are current-limited and will not safely handle the full 50 A specification of the original part. Use of undersized current ratings in applications requiring 50 A operation will result in component failure and circuit malfunction.

Q: Why does DHG60I600HA have a different speed classification than the original FFH50US60S?

A: DHG60I600HA is classified as standard recovery (>500 ns), whereas FFH50US60S is fast recovery (≤500 ns). This difference affects switching performance and switching losses in the circuit. Standard recovery diodes are not direct equivalents for fast recovery applications and may degrade circuit efficiency and switching characteristics.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original FFH50US60S specification. Compliance certifications are provided in the product data.

Q: What is the significance of reverse recovery time (trr) in diode selection?

A: Reverse recovery time determines how quickly the diode transitions from conducting to blocking state. Lower trr values (faster recovery) reduce switching losses and improve circuit efficiency. The FFH50US60S has a trr of 124 ns. Substitute parts with equal or lower trr values maintain or improve switching performance. Parts with significantly higher trr values may increase switching losses.

Q: Can DSEP60-06A be used in high-temperature applications?

A: Yes. DSEP60-06A maintains the full -55°C to 175°C operating temperature range, matching the original FFH50US60S specification. This part is suitable for applications requiring extended temperature operation.

Q: What is the impact of forward voltage differences between substitute parts?

A: Forward voltage (Vf) affects power dissipation in the diode. The original FFH50US60S has Vf of 1.54 V at 50 A. Substitute parts with higher Vf values (such as PSDH6060S1_T0_00001 at 2.3 V) will dissipate more power as heat. Substitute parts with lower or comparable Vf values (such as STTH60L06W at 1.55 V) maintain similar thermal performance. Circuit thermal design should account for these differences.

Q: Is PSDH6060S1_T0_00001 suitable for applications requiring the full -55°C to 175°C temperature range?

A: PSDH6060S1_T0_00001 operates across -55°C to 150°C, which is 25°C below the original FFH50US60S specification of 175°C maximum. This part is not suitable for applications requiring operation at junction temperatures above 150°C.

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