FR107 Equivalent & Substitute Parts

Part Overview

The FR107 is a general-purpose rectifier diode rated for 1000 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. Manufactured by SMC Diode Solutions, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5	µA @ 1000 V
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitute parts for the FR107 are classified into two categories based on electrical parameter alignment:

Direct Equivalents maintain identical or near-identical electrical characteristics across all critical parameters: reverse voltage (1000 V), average rectified current (1 A), forward voltage (1.3 V @ 1 A), reverse recovery time (500 ns), and reverse leakage current (5 µA @ 1000 V). These parts are interchangeable in applications where the original FR107 specifications are required.

Parametric Equivalents meet the core voltage and current requirements but differ in secondary characteristics such as reverse recovery time, forward voltage, or capacitance. These parts are suitable for applications where the FR107 specifications are not strictly mandated and where the substitute's electrical performance remains within acceptable design margins.

Substitution eligibility is determined by:

Reverse voltage rating ≥ 1000 V
Average rectified current ≥ 1 A
Through-hole mounting configuration
DO-41 or DO-204AL package compatibility
Operating temperature range encompassing the application requirement

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	Temp Range [°C]
FR107	SMC Diode Solutions	1000	1	1.3 @ 1 A	500	5 @ 1000 V	DO-41	Obsolete	-65 to 150
FR107G	Taiwan Semiconductor Corporation	1000	1	1.3 @ 1 A	500	5 @ 1000 V	DO-204AL (DO-41)	Active	-55 to 150
BA159-E3/73	Vishay General Semiconductor - Diodes Division	1000	1	1.3 @ 1 A	500	5 @ 1000 V	DO-204AL (DO-41)	Active	-65 to 125
UF1MHA0G	Taiwan Semiconductor Corporation	1000	1	1.7 @ 1 A	75	5 @ 1000 V	DO-204AL (DO-41)	Active	-55 to 150
UF4007HB0G	Taiwan Semiconductor Corporation	1000	1	1.7 @ 1 A	75	5 @ 1000 V	DO-204AL (DO-41)	Active	-55 to 150
UF4008-G	Comchip Technology	1000	1	1.7 @ 1 A	75	5 @ 1000 V	DO-41	Obsolete	-55 to 150
BA159GP-AP	Micro Commercial Co	1000	1	1.3 @ 1 A	250	5 @ 1000 V	DO-41	Active	-65 to 150
FR107-T/B	MDD	1000	1	1.3 @ 1 A	500	6 @ 1000 V	DO-41	Active	-65 to 150

Engineering Selection Recommendations

For Direct Replacement (Active Status Required):

FR107G (Taiwan Semiconductor Corporation) is the primary direct equivalent. It maintains identical electrical specifications to the FR107 across reverse voltage, average rectified current, forward voltage, and reverse recovery time. The part is active and RoHS3 compliant. The operating temperature range is -55°C to 150°C, which is narrower at the lower bound than the original FR107 (-65°C to 150°C). Selection of FR107G is appropriate for applications where the minimum junction temperature does not fall below -55°C.

BA159-E3/73 (Vishay General Semiconductor - Diodes Division) is an alternative direct equivalent with identical electrical parameters. This part is active and RoHS3 compliant. The operating temperature range is -65°C to 125°C, which matches the lower temperature bound of the FR107 but has a reduced upper temperature limit of 125°C compared to the FR107's 150°C. Selection is appropriate for applications with maximum junction temperatures not exceeding 125°C.

For Parametric Substitution (Active Status, Automotive Grade):

UF1MHA0G and UF4007HB0G (Taiwan Semiconductor Corporation) are automotive-grade alternatives qualified to AEC-Q101. Both parts maintain the 1000 V reverse voltage and 1 A current ratings. Forward voltage is higher at 1.7 V @ 1 A compared to the FR107's 1.3 V, and reverse recovery time is significantly faster at 75 ns versus 500 ns. These parts are suitable for applications where faster switching characteristics are beneficial and where the higher forward voltage drop is acceptable. Operating temperature range is -55°C to 150°C.

For Parametric Substitution (Active Status, Standard Grade):

BA159GP-AP (Micro Commercial Co) is an active parametric equivalent with 1.3 V forward voltage matching the FR107. Reverse recovery time is 250 ns, intermediate between the FR107 (500 ns) and the automotive-grade alternatives (75 ns). Operating temperature range is -65°C to 150°C, matching the FR107 specification. This part is suitable for applications requiring the original forward voltage characteristic with improved switching speed.

FR107-T/B (MDD) is an active alternative with specifications nearly identical to the FR107. Reverse recovery time is 500 ns, and forward voltage is 1.3 V @ 1 A. Reverse leakage current is 6 µA @ 1000 V, marginally higher than the FR107's 5 µA. Operating temperature range is -65°C to 150°C. This part is RoHS compliant and suitable for direct replacement where the slight increase in leakage current is acceptable.

Obsolete Status Consideration:

UF4008-G (Comchip Technology) is classified as obsolete and should not be selected for new designs despite its availability in inventory. The part exhibits higher forward voltage (1.7 V @ 1 A) and faster recovery time (75 ns) compared to the FR107.

Frequently Asked Questions (FAQ)

Q: Can FR107G be used as a direct replacement for FR107 in all applications?

A: FR107G is electrically equivalent to FR107 across all primary parameters. However, the operating temperature range differs: FR107G is rated -55°C to 150°C while FR107 is -65°C to 150°C. FR107G is suitable for applications where the minimum junction temperature remains above -55°C.

Q: What is the difference between direct equivalents and parametric equivalents?

A: Direct equivalents (FR107G, BA159-E3/73) maintain identical electrical specifications including forward voltage (1.3 V @ 1 A) and reverse recovery time (500 ns). Parametric equivalents (UF1MHA0G, UF4007HB0G) meet voltage and current requirements but differ in secondary characteristics such as forward voltage (1.7 V @ 1 A) and reverse recovery time (75 ns). Selection depends on whether the application requires the original specifications or can tolerate variations.

Q: Why do some substitutes have faster reverse recovery times?

A: Reverse recovery time (trr) is a characteristic of diode technology and manufacturing process. Automotive-grade parts (UF1MHA0G, UF4007HB0G) are designed with faster recovery times (75 ns) compared to standard-grade parts (500 ns). Faster recovery reduces switching losses in high-frequency applications but is not required for all circuit designs.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed (FR107G, BA159-E3/73, UF1MHA0G, UF4007HB0G, BA159GP-AP, FR107-T/B) are RoHS3 compliant. The original FR107 and obsolete UF4008-G do not have RoHS compliance specified in their data.

Q: What is the significance of the DO-41 and DO-204AL package designations?

A: DO-41 and DO-204AL are equivalent package designations for the same through-hole axial diode form factor. All substitute parts use this package type, ensuring mechanical compatibility with FR107 circuit board layouts and footprints.

Q: Can BA159-E3/73 be used in applications requiring operation above 125°C?

A: No. BA159-E3/73 is rated for a maximum junction temperature of 125°C. Applications requiring operation up to 150°C must use FR107G, UF1MHA0G, UF4007HB0G, BA159GP-AP, or FR107-T/B.

Q: Why is UF4008-G not recommended despite being listed as a substitute?

A: UF4008-G is classified as obsolete. While it meets the voltage and current requirements, its obsolete status makes it unsuitable for new designs. Active alternatives with equivalent or superior specifications are available.

Q: What is the impact of higher forward voltage in UF1MHA0G and UF4007HB0G?

A: Forward voltage of 1.7 V @ 1 A (compared to FR107's 1.3 V @ 1 A) results in increased power dissipation in the diode. For a 1 A load, the additional dissipation is 0.4 W. This must be evaluated in the context of the circuit's thermal design and power budget.

Q: Are automotive-grade parts (UF1MHA0G, UF4007HB0G) suitable for non-automotive applications?

A: Yes. Automotive-grade parts with AEC-Q101 qualification meet stringent reliability and quality standards. They are suitable for any application where their electrical specifications align with circuit requirements, regardless of whether the application is automotive.

Q: What is the minimum operating temperature for each substitute part?

A: FR107G, UF1MHA0G, and UF4007HB0G are rated to -55°C. BA159-E3/73, BA159GP-AP, and FR107-T/B are rated to -65°C. Applications requiring operation below -55°C must use parts rated to -65°C.

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