FR156 Equivalent & Substitute Parts

Part Overview

The FR156 is a general-purpose rectifier diode rated for 800 V DC reverse voltage and 1.5 A average rectified current in a through-hole DO-15 package. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The FR156 employs standard diode technology with fast recovery characteristics suitable for power supply and rectification circuits requiring moderate voltage and current ratings.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 1.5	V @ A
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction	-65 to 150	°C

Substitute Part Grouping Explanation

Substitution of the FR156 is determined by electrical and mechanical parameter equivalence. The primary substitution criteria are:

Voltage Rating: DC reverse voltage must equal or exceed 800 V
Current Rating: Average rectified current must equal or exceed 1.5 A
Forward Voltage Drop: Maximum forward voltage at rated current must not exceed 1.3 V @ 1.5 A
Recovery Characteristics: Reverse recovery time must be ≤ 500 ns for fast recovery operation
Reverse Leakage: Maximum reverse leakage current must not exceed 5 µA @ 800 V
Package Compatibility: Through-hole axial package (DO-15 / DO-204AC) required for mechanical fit
Operating Temperature Range: Junction temperature range must accommodate application requirements

The FR156G, manufactured by Taiwan Semiconductor Corporation, meets all electrical parameter requirements and maintains package compatibility through the DO-204AC (DO-15) designation.

Parameter Comparison

Parameter	FR156 (SMC)	FR156G (TSC)	Match Status
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	Equivalent
Current - Average Rectified (Io)	1.5 A	1.5 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	1.3 V @ 1.5 A	Equivalent
Reverse Recovery Time (trr)	500 ns	500 ns	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	Equivalent
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	FR156G Lower
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	Equivalent
Operating Temperature - Junction	-65°C ~ 150°C	-55°C ~ 150°C	FR156G Narrower Range
Product Status	Obsolete	Active	FR156G Active

Engineering Selection Recommendations

The FR156G is a direct electrical and mechanical substitute for the FR156. Both components share identical voltage, current, and recovery time specifications. The FR156G is manufactured by Taiwan Semiconductor Corporation and maintains active product status, ensuring continued availability and supply chain reliability.

The FR156G is RoHS3 compliant and carries REACH Unaffected status, meeting current regulatory requirements for electronic component procurement. Both parts maintain ECCN EAR99 classification and identical HTSUS coding (8541.10.0080).

The FR156G exhibits lower junction capacitance (20 pF versus 30 pF at 4V, 1MHz), which may provide improved high-frequency performance in switching applications. The FR156G operating temperature range (-55°C to 150°C) is narrower than the FR156 (-65°C to 150°C) at the lower bound; applications requiring operation below -55°C require verification against specific circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can FR156G replace FR156 in existing designs?

A: Yes. The FR156G meets all critical electrical parameters: 800 V reverse voltage, 1.5 A average rectified current, 1.3 V forward voltage drop at rated current, and 500 ns reverse recovery time. Package compatibility is maintained through the DO-15 / DO-204AC axial through-hole configuration.

Q: What is the difference in capacitance between FR156 and FR156G?

A: The FR156G has lower junction capacitance (20 pF) compared to the FR156 (30 pF), both measured at 4V and 1MHz. This difference may improve switching performance in high-frequency rectification circuits but does not affect DC rectification performance.

Q: Are there temperature range limitations with FR156G?

A: The FR156G operates from -55°C to 150°C junction temperature, compared to the FR156 range of -65°C to 150°C. Applications requiring operation below -55°C must confirm compatibility with circuit thermal requirements.

Q: What compliance certifications apply to FR156G?

A: The FR156G is RoHS3 compliant and REACH Unaffected. Both certifications align with current regulatory standards for electronic component procurement in industrial and commercial applications.

Q: Is packaging different between FR156 and FR156G?

A: Both components use identical through-hole axial packaging designated as DO-15 or DO-204AC. Physical dimensions and lead configurations are compatible for direct board-level substitution.

Q: Why is FR156 listed as obsolete?

A: The FR156 is no longer in active production. The FR156G serves as the active equivalent, providing continued access to 800 V / 1.5 A rectifier diode functionality with current manufacturing support and supply availability.

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