FR105-AP Equivalent & Substitute Parts

Part Overview

The FR105-AP is a general-purpose rectifier diode rated for 600 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements. Substitute parts maintain the same electrical performance characteristics while offering active product status and improved availability.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A
Reverse Recovery Time (trr)	250 ns
Current - Reverse Leakage @ Vr	5 µA @ 600 V
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the FR105-AP are classified into two categories based on electrical parameter alignment:

Direct Manufacturer Equivalents maintain identical electrical specifications across all critical parameters: 600 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, 250 ns reverse recovery time, and 5 µA reverse leakage current at 600 V. These parts are pin-compatible and functionally interchangeable without circuit modification.

Parametric Equivalents satisfy the core electrical requirements (600 V, 1 A, through-hole mounting) but may exhibit variations in secondary parameters such as forward voltage (1.2 V versus 1.3 V), reverse recovery time (200 ns or 35 ns versus 250 ns), or junction temperature range. These parts are suitable for applications where the specified parameter variations do not impact circuit performance.

Similar Parts meet the primary voltage and current ratings but differ in current capacity (2 A versus 1 A) or product status classification. These parts are applicable in designs where higher current capability provides design margin or where product lifecycle status permits their use.

Substitution eligibility is determined by: (1) Voltage - DC Reverse rating ≥ 600 V, (2) Current - Average Rectified rating ≥ 1 A, (3) Through-hole mounting configuration, (4) DO-41 or DO-204AL package compatibility, and (5) ROHS3 compliance.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	trr	Ir @ Vr	Product Status	Packaging
FR105-AP	Micro Commercial Co	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	Obsolete	DO-41
FR105GP-AP	Micro Commercial Co	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	Active	Tape & Box
1N4937GP-AP	Micro Commercial Co	600 V	1 A	1.2 V @ 1 A	200 ns	5 µA @ 600 V	Active	DO-41
1N4946GP-AP	Micro Commercial Co	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	Active	DO-41
SF18G-AP	Micro Commercial Co	600 V	1 A	1.3 V @ 1 A	35 ns	5 µA @ 600 V	Active	Tape & Box
1N4937RLG	onsemi	600 V	1 A	1.2 V @ 1 A	300 ns	5 µA @ 600 V	Not For New Designs	Axial
BA158-E3/53	Vishay General Semiconductor	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	Active	DO-204AL
BA158-E3/54	Vishay General Semiconductor	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	Active	Cut Tape
MUR260RLG	onsemi	600 V	2 A	1.35 V @ 2 A	75 ns	5 µA @ 600 V	Active	Axial
FR105A-G	Comchip Technology	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	Active	Tape & Box
FR105G A0G	Taiwan Semiconductor Corporation	600 V	1 A	1.3 V @ 1 A	250 ns	5 µA @ 600 V	Active	Cut Tape

Engineering Selection Recommendations

Primary Recommendation: FR105GP-AP

FR105GP-AP is the direct equivalent from the original manufacturer, Micro Commercial Co. This part maintains identical electrical specifications to the FR105-AP across all parameters: 600 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, 250 ns reverse recovery time, and 5 µA reverse leakage current. The part is active in production status with ROHS3 compliance and unlimited moisture sensitivity level. Packaging is supplied as Tape & Box format with 850 pieces in current inventory.

Secondary Recommendation: 1N4946GP-AP

1N4946GP-AP is an active parametric equivalent from Micro Commercial Co that matches all electrical specifications of the FR105-AP. This part is available in DO-41 package with 1073 pieces in inventory, providing superior availability. ROHS3 compliance and unlimited MSL rating are maintained.

Alternative Recommendation: FR105A-G

FR105A-G from Comchip Technology is an active parametric equivalent with identical electrical performance. This part is supplied in Tape & Box packaging with 999 pieces in inventory. ROHS3 compliance and unlimited MSL rating are maintained.

Cross-Manufacturer Alternative: BA158-E3/54

BA158-E3/54 from Vishay General Semiconductor is an active part with matching electrical specifications. This part is supplied in Cut Tape packaging with 25653 pieces in inventory, providing the highest availability among all substitutes. ROHS3 compliance and unlimited MSL rating are maintained. Operating temperature range is -65°C to 125°C.

Higher Current Capability: MUR260RLG

MUR260RLG from onsemi is rated for 2 A average rectified current at 600 V reverse voltage, providing 100% current margin over the 1 A requirement. This part is active in production with 80300 pieces in inventory. Reverse recovery time is 75 ns, significantly faster than the FR105-AP. ROHS3 compliance is maintained. This part is suitable for applications requiring design margin or where higher current capacity is beneficial.

Parts classified as "Not For New Designs" (1N4937RLG) are not recommended for new circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can FR105GP-AP be used as a direct replacement for FR105-AP?

A: Yes. FR105GP-AP is manufactured by the same company (Micro Commercial Co) and maintains identical electrical specifications: 600 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, 250 ns reverse recovery time, and 5 µA reverse leakage current. The primary difference is product status (active versus obsolete) and packaging format (Tape & Box versus unspecified). Pin configuration and package outline are compatible.

Q: What is the difference between DO-41 and DO-204AL packages?

A: DO-41 and DO-204AL are equivalent package designations for the same physical form factor. Both refer to an axial through-hole diode package with identical lead spacing and mounting characteristics. Parts specified as DO-204AL (DO-41) or DO-41 are mechanically and electrically interchangeable in circuit board layouts.

Q: Can MUR260RLG replace FR105-AP in all applications?

A: MUR260RLG is rated for 2 A average rectified current compared to the 1 A rating of FR105-AP. The higher current rating provides design margin and does not create compatibility issues in circuits designed for 1 A operation. However, MUR260RLG exhibits different forward voltage characteristics (1.35 V @ 2 A versus 1.3 V @ 1 A) and significantly faster reverse recovery time (75 ns versus 250 ns). These differences may affect circuit performance in applications sensitive to switching speed or forward voltage drop. Verification of circuit operation is required for applications with critical timing or voltage regulation requirements.

Q: What does "Not For New Designs" status mean?

A: Parts designated as "Not For New Designs" are in mature or declining production phases. While these parts remain available and functional, manufacturers recommend using active product alternatives for new circuit designs. Existing designs using these parts may continue production, but new implementations should select from active product lines.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance status, matching the environmental compliance of the FR105-AP.

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

A: Reverse recovery time (trr) is the interval required for a diode to transition from forward conduction to reverse blocking state. The FR105-AP specifies 250 ns. Substitute parts exhibit trr values ranging from 35 ns (SF18G-AP) to 300 ns (1N4937RLG). Faster recovery times reduce switching losses in high-frequency applications but may introduce ringing or overshoot in circuits not designed for ultrafast recovery. Slower recovery times are generally compatible with applications designed for the original 250 ns specification.

Q: Which substitute offers the highest inventory availability?

A: BA158-E3/54 from Vishay General Semiconductor offers the highest inventory availability with 25653 pieces in stock. This part maintains identical electrical specifications to the FR105-AP and is supplied in Cut Tape packaging.

Q: Can parts with different forward voltage ratings be substituted?

A: Forward voltage differences between 1.2 V and 1.3 V are generally acceptable in most rectifier applications where the diode operates in the forward-biased state. However, applications with tight voltage regulation requirements or low-voltage circuits may be sensitive to this 0.1 V difference. Circuit analysis is required to confirm compatibility in voltage-critical applications.

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