RL104-TP Equivalent & Substitute Parts

Part Overview

The RL104-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 400 V DC reverse voltage and 1 A average rectified current in an axial through-hole package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity. Substitute parts must maintain electrical performance within the specified voltage, current, and thermal operating ranges while accommodating standard through-hole mounting requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 1 A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Through Hole	—
Package / Case	Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the RL104-TP is determined by equivalence in the following critical parameters:

Voltage Rating: Reverse voltage must equal or exceed 400 V DC
Current Rating: Average rectified current must equal or exceed 1 A
Recovery Speed: Standard recovery characteristics (>500 ns, >200 mA) must be maintained
Mounting Configuration: Through-hole axial package required for mechanical compatibility
Operating Temperature Range: Junction temperature range must accommodate -55°C to 150°C or equivalent operational envelope
Regulatory Compliance: RoHS compliance status must be verified for end-use application requirements

The EM 1V0 manufactured by Sanken Electric USA Inc. satisfies these substitution criteria with matching voltage and current ratings, identical package configuration, and active product status.

Parameter Comparison

Parameter	RL104-TP (Micro Commercial Co)	EM 1V0 (Sanken Electric USA Inc.)	Match Status
Voltage - DC Reverse (Vr) (Max)	400 V	400 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	970 mV @ 1 A	Compatible (EM 1V0 lower)
Speed	Standard Recovery >500ns, > 200mA (Io)	Standard Recovery >500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 400 V	10 µA @ 400 V	Compatible (EM 1V0 higher)
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	Axial	Axial	Equivalent
Operating Temperature - Junction	-55°C to 150°C	-40°C to 150°C	Compatible (EM 1V0 narrower low-end)
RoHS Status	ROHS3 Compliant	RoHS Compliant	Compatible

Engineering Selection Recommendations

RL104-TP to EM 1V0 Substitution

The EM 1V0 is a direct functional equivalent for the obsolete RL104-TP. Both components share identical voltage and current ratings (400 V, 1 A), matching recovery speed characteristics, and axial through-hole package configuration. The EM 1V0 is currently in active production status, ensuring long-term availability and supply chain continuity.

Differences in forward voltage (EM 1V0: 970 mV versus RL104-TP: 1.1 V) and reverse leakage current (EM 1V0: 10 µA versus RL104-TP: 5 µA) remain within acceptable tolerances for general-purpose rectification applications. The EM 1V0 operating temperature range (-40°C to 150°C) is narrower at the lower extreme but covers standard industrial and commercial operating conditions.

Both components maintain RoHS compliance, satisfying regulatory requirements for new designs and legacy system updates. The EM 1V0 is supplied in Tape & Box packaging, standard for high-volume procurement and automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the EM 1V0 replace the RL104-TP in existing designs?

A: Yes. The EM 1V0 provides electrical equivalence across all critical parameters: 400 V reverse voltage, 1 A average rectified current, standard recovery speed, and axial through-hole mounting. Both components are rated for -40°C to 150°C (EM 1V0) and -55°C to 150°C (RL104-TP) junction temperature ranges, covering standard operating environments.

Q: What is the difference in forward voltage between these parts?

A: The RL104-TP specifies 1.1 V maximum forward voltage at 1 A, while the EM 1V0 specifies 970 mV maximum at the same current. The EM 1V0 exhibits lower forward voltage drop, which may reduce power dissipation in rectification circuits. This difference does not prevent substitution in general-purpose applications.

Q: Are there packaging differences between RL104-TP and EM 1V0?

A: Both components use axial through-hole packages suitable for PCB mounting. The RL104-TP supplier device package is designated A-405, while the EM 1V0 packaging information is not specified in available data. Both are compatible with standard through-hole assembly processes.

Q: Does the EM 1V0 meet RoHS requirements?

A: Yes. The EM 1V0 is RoHS Compliant. The RL104-TP is ROHS3 Compliant. Both satisfy regulatory requirements for lead-free and restricted substance compliance in electronic equipment manufacturing.

Q: What is the reverse leakage current difference?

A: The RL104-TP specifies 5 µA maximum reverse leakage at 400 V, while the EM 1V0 specifies 10 µA at the same voltage. The EM 1V0 exhibits higher reverse leakage, which remains acceptable for general-purpose rectification but may impact performance in high-impedance or precision analog circuits requiring minimal leakage current.

Q: Is the EM 1V0 available in the same quantities as the RL104-TP?

A: The EM 1V0 is currently in active production with 934 pieces in stock, compared to 661 pieces of the obsolete RL104-TP. Active production status ensures sustained availability for ongoing procurement requirements.

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