FFH30US30DN Equivalent & Substitute Parts

Part Overview

The FFH30US30DN is a diode array rectifier manufactured by onsemi, featuring a 1 Pair Common Cathode configuration with avalanche technology. This component is rated for 300 V DC reverse voltage and 30 A average rectified current per diode, housed in a TO-247-3 through-hole package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	300 V
Current - Average Rectified (Io) (per Diode)	30 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 30 A
Reverse Recovery Time (trr)	55 ns
Diode Configuration	1 Pair Common Cathode
Package / Case	TO-247-3
Operating Temperature - Junction	-55°C ~ 175°C
Mounting Type	Through Hole
Technology	Avalanche

Substitute Part Grouping Explanation

Substitution of the FFH30US30DN is determined by the following critical parameters: voltage rating (300 V minimum), current rating (30 A minimum per diode), diode configuration (1 Pair Common Cathode), package type (TO-247-3 compatible), and operating temperature range (-55°C to 175°C minimum). Parts meeting these specifications are classified as direct substitutes. Parts with reduced current ratings (15 A or 25 A) or increased voltage ratings (400 V) are classified as partial substitutes, suitable only when circuit design permits derating or overvoltage margin. Parts with obsolete status are noted but remain functionally equivalent if specifications align.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (per Diode)	Vf (Max) @ If	trr (ns)	Package	Temp Range	Status
FFH30US30DN	onsemi	300 V	30 A	1 V @ 30 A	55	TO-247-3	-55°C ~ 175°C	Obsolete
DPF60C300HB	IXYS	300 V	30 A	1.16 V @ 30 A	55	TO-247-3	-55°C ~ 175°C	Active
VS-60CPH03-N3	Vishay	300 V	30 A	1.25 V @ 30 A	Not specified	TO-247-3	-55°C ~ 175°C	Active
STTH8003CY	STMicroelectronics	300 V	40 A	1.25 V @ 40 A	60	TO-247-3	-55°C ~ 175°C	Obsolete
STTH50W03CW	STMicroelectronics	300 V	25 A	1.5 V @ 25 A	27	TO-247-3	-55°C ~ 175°C	Active
STTH3003CW	STMicroelectronics	300 V	15 A	1.25 V @ 15 A	40	TO-247-3	-55°C ~ 175°C	Active
STTH30R03CW	STMicroelectronics	300 V	15 A	1.9 V @ 15 A	35	TO-247-3	-55°C ~ 175°C	Active
FEP30GP-E3/45	Vishay	400 V	15 A	1.3 V @ 15 A	50	TO-247-3	-55°C ~ 150°C	Active

Engineering Selection Recommendations

Direct Substitutes (Recommended for 1:1 Replacement):

DPF60C300HB (IXYS) and VS-60CPH03-N3 (Vishay) are direct substitutes meeting all critical parameters: 300 V rating, 30 A current per diode, TO-247-3 package, and -55°C to 175°C operating range. Both parts are active status with ROHS3 compliance and unlimited moisture sensitivity level. DPF60C300HB exhibits marginally higher forward voltage (1.16 V vs. 1 V) and identical reverse recovery time (55 ns). VS-60CPH03-N3 operates with standard recovery speed classification and is qualified under the FRED Pt® series.

Partial Substitutes (Current Derating Required):

STTH50W03CW (STMicroelectronics) provides 25 A per diode at 300 V, suitable for applications where 30 A operation can be derated to 25 A. This part offers superior reverse recovery time (27 ns) and active product status with ECOPACK®2 series designation. STTH3003CW and STTH30R03CW (both STMicroelectronics) are rated for 15 A per diode, requiring significant current derating and suitable only for reduced-load applications.

Overvoltage-Rated Substitute:

FEP30GP-E3/45 (Vishay) provides 400 V rating with 15 A current, introducing both overvoltage margin and current derating. This part is suitable only when circuit design permits both conditions simultaneously.

Obsolete Status Alternatives:

STTH8003CY (STMicroelectronics) is rated for 40 A per diode at 300 V, exceeding the original specification and providing current margin. Despite obsolete status, this part remains functionally superior for direct replacement. AEC-Q101 automotive qualification is provided.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and REACH unaffected status, matching the original part's regulatory profile.

Frequently Asked Questions (FAQ)

Q: Can DPF60C300HB replace FFH30US30DN in all applications?

A: DPF60C300HB is a direct substitute meeting voltage, current, package, and temperature specifications. The forward voltage differential (1.16 V vs. 1 V @ 30 A) results in approximately 4.6% higher power dissipation per diode. Circuit thermal analysis should confirm acceptable junction temperatures under worst-case conditions.

Q: What is the difference between avalanche and standard technology in these diodes?

A: The FFH30US30DN employs avalanche technology, while most substitutes use standard technology. Both technologies support the specified voltage and current ratings. Avalanche technology provides inherent overvoltage protection through controlled breakdown characteristics. Standard technology substitutes do not provide this feature and require external protection circuits if avalanche protection is required by the application.

Q: Can STTH50W03CW be used if the application only requires 25 A operation?

A: STTH50W03CW is suitable for applications designed for 25 A operation. The part is rated for 25 A per diode at 300 V and provides superior reverse recovery time (27 ns vs. 55 ns). No derating is required when the application current does not exceed 25 A. Thermal design must account for the specified forward voltage (1.5 V @ 25 A).

Q: Why do some substitutes have lower current ratings?

A: STTH3003CW, STTH30R03CW, and FEP30GP-E3/45 are rated for 15 A per diode. These parts are included as substitutes for applications where circuit redesign or load reduction permits operation at lower current levels. Direct replacement without circuit modification is not recommended for these parts.

Q: Are all substitute parts available in the same package?

A: All substitute parts use TO-247-3 or compatible TO-247 package variants (TO-247AD, TO-247AC, MAX247™). These packages are mechanically and electrically interchangeable for through-hole mounting applications. Verify PCB footprint compatibility before assembly.

Q: What is the significance of reverse recovery time differences?

A: Reverse recovery time (trr) ranges from 27 ns (STTH50W03CW) to 60 ns (STTH8003CY). Lower trr values reduce switching losses and electromagnetic interference in high-frequency applications. The original FFH30US30DN specifies 55 ns. Substitutes with lower trr values (27 ns, 35 ns, 40 ns) provide performance improvement; those with higher trr (60 ns) introduce marginal degradation.

Q: Is STTH8003CY recommended despite obsolete status?

A: STTH8003CY is functionally superior with 40 A per diode rating, exceeding the original 30 A specification. Obsolete status indicates discontinued production; however, inventory availability is confirmed at 7,178 pieces. This part is suitable for new designs only if long-term supply is secured through inventory acquisition. AEC-Q101 automotive qualification is provided.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), REACH unaffected status, and EAR99 export classification, matching the original FFH30US30DN regulatory profile. No additional compliance verification is required for substitution.

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