FJH1102 Equivalent & Substitute Parts

Part Overview

The FJH1102 is a general-purpose rectifier diode manufactured by onsemi, rated for 25 V DC reverse voltage and 150 mA average rectified current in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while accommodating modern availability and compliance requirements.

Key Parameters

Parameter	FJH1102 Specification
Voltage - DC Reverse (Vr) (Max)	25 V
Current - Average Rectified (Io)	150 mA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 10 mA
Package / Case	DO-204AH, DO-35, Axial
Mounting Type	Through Hole
Operating Temperature - Junction (Max)	175°C
Technology	Standard
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the FJH1102 are selected based on the following substitution criteria:

Primary Compatibility Parameters:

Package / Case: DO-204AH, DO-35, Axial (through-hole mounting)
Technology: Standard rectifier diode
Voltage - DC Reverse (Vr): Equal to or greater than 25 V
Current - Average Rectified (Io): Equal to or greater than 150 mA
Operating Temperature - Junction: Equal to or greater than 175°C (where specified)

Substitution Logic: Substitute parts must accommodate the FJH1102 electrical requirements without exceeding design constraints. Parts with higher voltage ratings and current capabilities are acceptable as they provide operational margin. Forward voltage characteristics and reverse leakage specifications are secondary parameters that influence performance but do not preclude substitution when primary parameters are met.

Parameter Comparison

Parameter	FJH1102	1N4454TR	1N4448
Manufacturer	onsemi	onsemi	Microchip Technology
Voltage - DC Reverse (Vr) (Max)	25 V	50 V	75 V
Current - Average Rectified (Io)	150 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 10 mA	1 V @ 10 mA	1 V @ 100 mA
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	175°C (Max)	175°C (Max)	-65°C ~ 150°C
Product Status	Obsolete	Active	Discontinued at DiGi Electronics
Technology	Standard	Standard	Standard

Engineering Selection Recommendations

1N4454TR (Primary Substitute)

The 1N4454TR is the preferred substitute for the FJH1102. This part is manufactured by onsemi with active product status, ensuring long-term availability and supply chain stability. The 1N4454TR exceeds all primary electrical requirements: 50 V reverse voltage rating (versus 25 V required), 200 mA current capacity (versus 150 mA required), and maintains the 175°C maximum junction temperature specification. The DO-35 through-hole package is identical to the FJH1102. The 1N4454TR is RoHS3 compliant and carries REACH unaffected status. Inventory availability is substantial at 16,300 pieces.

1N4448 (Secondary Substitute)

The 1N4448 manufactured by Microchip Technology meets all primary electrical substitution criteria with 75 V reverse voltage and 200 mA current capacity. However, this part is discontinued at DiGi Electronics and carries a maximum junction temperature of 150°C, which is below the FJH1102 specification of 175°C. The 1N4448 is RoHS non-compliant. This part is suitable only for applications where the 150°C temperature limit is acceptable and where existing inventory can be sourced.

Frequently Asked Questions (FAQ)

Q: Can the 1N4454TR directly replace the FJH1102 in existing designs?

A: Yes. The 1N4454TR is a direct functional substitute. Both parts use the DO-35 through-hole package with identical pinout and mounting configuration. The 1N4454TR exceeds the FJH1102 electrical specifications, providing operational margin for voltage and current ratings.

Q: What is the primary difference between the 1N4454TR and 1N4448 substitutes?

A: The 1N4454TR is manufactured by onsemi with active product status and RoHS3 compliance, while the 1N4448 is discontinued and RoHS non-compliant. The 1N4454TR also maintains the 175°C maximum junction temperature of the FJH1102, whereas the 1N4448 is limited to 150°C.

Q: Are there any circuit design considerations when substituting the FJH1102?

A: Substitution is based on electrical parameter compatibility. The higher voltage and current ratings of substitute parts do not introduce design constraints. Forward voltage characteristics differ slightly between parts but remain within acceptable ranges for general-purpose rectification applications.

Q: Why is the FJH1102 classified as obsolete?

A: The FJH1102 is no longer in active production. The 1N4454TR and 1N4448 represent the current and recent alternatives from the same product families, offering improved availability and compliance certifications.

Q: What packaging options are available for these substitute parts?

A: All three parts (FJH1102, 1N4454TR, and 1N4448) are available in DO-35 through-hole axial packages. The 1N4454TR is supplied in cut tape (CT) packaging format. No surface-mount alternatives are specified in this substitution group.

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