Equivalent & Substitute Parts for Rohm Semiconductor 1SS244T-77 Diode

Part Overview

The Rohm Semiconductor 1SS244T-77 is a general-purpose diode classified under the Diodes, Rectifiers category. It features a maximum DC reverse voltage of 220 V and an average rectified current rating of 200 mA, with a through-hole mounting and an MSD package. The product is currently listed as obsolete, necessitating the identification of suitable alternative models to ensure availability for ongoing or future designs.

Key Parameters

Manufacturer Part Number	Manufacturer	Category	Voltage - DC Reverse (Vr) (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Reverse Recovery Time (trr)	Current - Reverse Leakage @ Vr	Mounting Type	Package / Case	Operating Temperature - Junction	RoHS Status	REACH Status
1SS244T-77	Rohm Semiconductor	Diodes, Rectifiers	220 V	200 mA	1.5 V @ 200 mA	75 ns	10 µA @ 220 V	Through Hole	DO-204AG, DO-34, Axial	175°C (Max)	ROHS3 Compliant	REACH Unaffected
STTH102	STMicroelectronics	Diodes, Rectifiers	200 V	1 A	970 mV @ 1 A	20 ns	1 µA @ 200 V	Through Hole	DO-204AL, DO-41, Axial	175°C (Max)	ROHS3 Compliant	REACH Unaffected

Substitute Part Grouping Explanation

Substitutes for the 1SS244T-77 are grouped based solely on alignment of key electrical and package parameters. The primary criteria used are: maximum reverse voltage, average rectified current, voltage forward drop, reverse recovery time, reverse leakage current, mounting type, package/case dimensions, operating junction temperature, RoHS compliance, and REACH status. Only parts with values provided for all these attributes are considered for direct substitution.

Parameter Comparison

Manufacturer Part Number	Voltage - DC Reverse (Vr) (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Reverse Recovery Time (trr)	Current - Reverse Leakage @ Vr	Mounting Type	Package / Case	Operating Temperature - Junction	RoHS Status	REACH Status
1SS244T-77	220 V	200 mA	1.5 V @ 200 mA	75 ns	10 µA @ 220 V	Through Hole	DO-204AG, DO-34, Axial	175°C (Max)	ROHS3 Compliant	REACH Unaffected
STTH102	200 V	1 A	970 mV @ 1 A	20 ns	1 µA @ 200 V	Through Hole	DO-204AL, DO-41, Axial	175°C (Max)	ROHS3 Compliant	REACH Unaffected

Engineering Selection Recommendations

The 1SS244T-77 is marked as obsolete. Substitute selection is strictly determined by availability and compliance requirements. The STTH102 is classified as active and meets RoHS3 as well as REACH standards as provided. Product selection must be based on matching electrical, mechanical, and compliance parameters according to the supplied data.

Frequently Asked Questions (FAQ)

Q1: What parameters are crucial in selecting a substitute for the 1SS244T-77?
A1: Substitution is strictly based on maximum reverse voltage, average rectified current, voltage forward drop at specified current, reverse recovery time, reverse leakage current, mounting type, package/case dimensions, operating junction temperature, RoHS compliance, and REACH status.

Q2: Is package compatibility necessary for direct replacement?
A2: Yes. Through-hole mounting and axial package type must match as specified in the comparison.

Q3: Is the STTH102 compliant with environmental and regulatory standards?
A3: The STTH102 is listed as ROHS3 compliant and REACH unaffected.

Q4: Can the substitute part be used in all previous applications of the 1SS244T-77?
A4: Compatibility is determined only by the key parameters provided. No additional application assurance is given outside these values.

Q5: How should operating temperature be considered?
A5: Both the original part and substitute are rated to a maximum junction temperature of 175°C as per the supplied data.

Q6: Are there any differences in package/case size or style to note?
A6: The original part uses DO-204AG, DO-34, Axial; the substitute uses DO-204AL, DO-41, Axial. Selection should be confirmed by direct package/case match as specified.

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