FR104 Equivalent & Substitute Parts

Part Overview

The FR104 is a general-purpose rectifier diode rated for 400 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 components maintain the same electrical performance characteristics while offering active product status and improved availability.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A
Reverse Recovery Time (trr)	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-65°C ~ 150°C
Technology	Standard

Substitute Part Grouping Explanation

Substitute parts for the FR104 are classified based on electrical parameter equivalence and package compatibility. The primary substitution criteria are:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 1 A
Reverse Recovery Time (trr): 150 ns
Current - Reverse Leakage @ Vr: 5 µA @ 400 V
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical Parameters (Must Match):

Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, Axial

Acceptable Variations:

Operating Temperature - Junction range may differ within the specified limits
Capacitance @ Vr, F may vary (10pF to 15pF @ 4V, 1MHz)
Product Status: Active products are preferred over obsolete classifications
Compliance certifications (RoHS, REACH) enhance suitability for regulated applications

Parts are grouped into two categories: Direct Manufacturer Substitutes (same base product number, different manufacturer or variant) and Parametric Equivalents (different base product number, identical electrical and mechanical specifications).

Parameter Comparison

Parameter	FR104 (SMC)	FR104G (TSC)	FR104G B0G (TSC)	BA157GP-AP (MCC)
Manufacturer	SMC Diode Solutions	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	400 V	400 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1 A	1.3 V @ 1 A	1.3 V @ 1 A	1.3 V @ 1 A
Reverse Recovery Time (trr)	150 ns	150 ns	150 ns	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V	5 µA @ 400 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Capacitance @ Vr, F	15pF @ 4V, 1MHz	10pF @ 4V, 1MHz	10pF @ 4V, 1MHz	15pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

FR104G (Taiwan Semiconductor Corporation) and FR104G B0G (Taiwan Semiconductor Corporation) are direct manufacturer substitutes with active product status. Both parts maintain identical electrical specifications to the FR104 and are ROHS3 compliant. The FR104G is supplied in Cut Tape (CT) packaging with 818 units in stock, while FR104G B0G offers 1036 units in stock. The operating temperature range for both TSC variants is -55°C ~ 150°C, which is narrower than the original FR104 (-65°C ~ 150°C) and should be verified for applications requiring operation below -55°C.

BA157GP-AP (Micro Commercial Co) is a parametric equivalent offering identical electrical performance and the same operating temperature range as the original FR104 (-65°C ~ 150°C). This part is ROHS3 compliant with 996 units in stock. The BA157GP-AP maintains the same capacitance specification (15pF @ 4V, 1MHz) as the original FR104, whereas the TSC variants specify 10pF.

For applications requiring the full -65°C ~ 150°C operating temperature range, BA157GP-AP is the preferred selection. For standard temperature applications (-55°C ~ 150°C), FR104G or FR104G B0G provide direct manufacturer continuity. All substitute parts are ROHS3 compliant and REACH unaffected, suitable for regulated markets.

Frequently Asked Questions (FAQ)

Q: Can FR104G be used as a direct replacement for FR104?

A: Yes. FR104G maintains all critical electrical parameters: 400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, and 150 ns reverse recovery time. Both use through-hole DO-41 packaging. The operating temperature range differs (-55°C ~ 150°C for FR104G versus -65°C ~ 150°C for FR104), which must be verified for low-temperature applications.

Q: What is the difference between FR104G and FR104G B0G?

A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications and operating temperature ranges (-55°C ~ 150°C). The primary difference is packaging designation and inventory availability. FR104G is supplied in Cut Tape (CT) with 818 units in stock, while FR104G B0G has 1036 units available. Electrical performance is equivalent.

Q: Is BA157GP-AP compatible with the original FR104?

A: Yes. BA157GP-AP is a parametric equivalent with identical electrical specifications and the same operating temperature range (-65°C ~ 150°C) as the FR104. Both parts use through-hole DO-41 packaging. The manufacturer differs (Micro Commercial Co versus SMC Diode Solutions), but all critical performance parameters match.

Q: Why do some substitute parts have different capacitance values?

A: Capacitance @ Vr, F is specified as 15pF @ 4V, 1MHz for FR104 and BA157GP-AP, while FR104G and FR104G B0G specify 10pF @ 4V, 1MHz. Both values fall within acceptable ranges for general-purpose rectifier applications and do not affect the primary rectification function. Applications sensitive to junction capacitance should verify compatibility with the specific value.

Q: Are all substitute parts RoHS compliant?

A: Yes. FR104G, FR104G B0G, and BA157GP-AP are all ROHS3 compliant. The original FR104 does not specify RoHS status. All substitute parts are REACH unaffected.

Q: What packaging options are available for these parts?

A: All parts use through-hole mounting in DO-204AL, DO-41, or Axial package designations. FR104G is supplied in Cut Tape (CT) packaging. FR104G B0G and BA157GP-AP do not specify packaging format in the provided data. Verify packaging requirements with the supplier for specific procurement needs.

Q: Can these parts be used in high-temperature applications?

A: All parts are rated for operating junction temperatures up to 150°C. The maximum operating temperature is identical across all variants. Applications requiring operation above 150°C require alternative component selection.

Q: Which substitute should be selected for new designs?

A: For new designs, select from active product status parts: FR104G, FR104G B0G, or BA157GP-AP. All three are active products with ROHS3 compliance. Choose BA157GP-AP if the full -65°C ~ 150°C temperature range is required. Choose FR104G or FR104G B0G for standard temperature applications (-55°C ~ 150°C) with direct manufacturer continuity to the base product number.

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