DA227YFHT2R Equivalent & Substitute Parts

Part Overview

The DA227YFHT2R is a diode array manufactured by Rohm Semiconductor, configured as 2 independent general-purpose rectifier diodes rated for 80 V DC reverse voltage and 100 mA average rectified current per diode. This component is packaged in SC-75-4 (SOT-543) surface mount configuration and is qualified to AEC-Q101 automotive standards.

The DA227YFHT2R is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently utilizing this component.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	80 V
Current - Average Rectified (Io) (per Diode)	100 mA
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 100 mA
Reverse Recovery Time (trr)	4 ns
Current - Reverse Leakage @ Vr	100 nA @ 70 V
Operating Temperature - Junction (Max)	150°C
Diode Configuration	2 Independent
Technology	Standard
Grade	Automotive
Qualification	AEC-Q101
Mounting Type	Surface Mount
Package / Case	SC-75-4, SOT-543
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DA227YFHT2R is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): 80 V minimum
Current - Average Rectified (Io): 100 mA minimum per diode
Voltage - Forward (Vf) (Max) @ If: 1.2 V @ 100 mA maximum
Reverse Recovery Time (trr): 4 ns maximum
Current - Reverse Leakage @ Vr: 100 nA @ specified voltage
Operating Temperature - Junction (Max): 150°C minimum
Technology: Standard

Mechanical and Compliance Criteria:

Mounting Type: Surface Mount
Grade: Automotive
Qualification: AEC-Q101
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

The 1SS400SMFHT2R meets all electrical and compliance requirements for substitution. However, the package configuration differs: the substitute uses SC-79 (SOD-523) instead of SC-75-4 (SOT-543). This package difference requires physical board layout and footprint verification before implementation.

Parameter Comparison

Parameter	DA227YFHT2R (Main Part)	1SS400SMFHT2R (Substitute)	Match Status
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Identical
Voltage - DC Reverse (Vr) (Max)	80 V	80 V	Identical
Current - Average Rectified (Io)	100 mA	100 mA	Identical
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 100 mA	1.2 V @ 100 mA	Identical
Reverse Recovery Time (trr)	4 ns	4 ns	Identical
Current - Reverse Leakage @ Vr	100 nA @ 70 V	100 nA @ 80 V	Compatible
Operating Temperature - Junction (Max)	150°C	150°C	Identical
Technology	Standard	Standard	Identical
Grade	Automotive	Automotive	Identical
Qualification	AEC-Q101	AEC-Q101	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
Package / Case	SC-75-4, SOT-543	SC-79, SOD-523	Different
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The 1SS400SMFHT2R is electrically and functionally equivalent to the DA227YFHT2R across all specified electrical parameters. Both components are manufactured by Rohm Semiconductor, carry AEC-Q101 automotive qualification, and comply with ROHS3 standards.

The primary consideration for selection is the package configuration difference. The DA227YFHT2R uses SC-75-4 (SOT-543) packaging, while the 1SS400SMFHT2R uses SC-79 (SOD-523) packaging. These are distinct surface mount packages with different footprints and pin configurations.

The 1SS400SMFHT2R is currently in active production status with substantial inventory availability (11,800 pieces), whereas the DA227YFHT2R is obsolete. For new designs or production continuity, the 1SS400SMFHT2R is the appropriate selection, provided that the board layout and footprint accommodate the SC-79 (SOD-523) package.

Frequently Asked Questions (FAQ)

Q: Can the 1SS400SMFHT2R directly replace the DA227YFHT2R without circuit modification?

A: The 1SS400SMFHT2R is electrically equivalent and will function identically in the circuit. However, the package difference (SC-75-4 versus SC-79) requires physical board layout modification. Direct pin-for-pin substitution on existing PCBs is not possible without redesign.

Q: What is the key difference between these two parts?

A: Both parts are 80 V, 100 mA general-purpose rectifier diodes with identical electrical specifications. The DA227YFHT2R is a 2-independent diode array in SC-75-4 (SOT-543) packaging, while the 1SS400SMFHT2R is a single diode in SC-79 (SOD-523) packaging. The DA227YFHT2R is obsolete; the 1SS400SMFHT2R is active production.

Q: Are both parts automotive qualified?

A: Yes. Both the DA227YFHT2R and 1SS400SMFHT2R carry AEC-Q101 automotive qualification and are ROHS3 compliant.

Q: What is the reverse leakage current specification difference?

A: The DA227YFHT2R specifies 100 nA @ 70 V, while the 1SS400SMFHT2R specifies 100 nA @ 80 V. Both meet the same leakage current limit; the 1SS400SMFHT2R specification is measured at the higher voltage rating, indicating equivalent or superior performance.

Q: Can I use the 1SS400SMFHT2R in a new design to replace the obsolete DA227YFHT2R?

A: Yes. The 1SS400SMFHT2R is the appropriate selection for new designs. The electrical specifications are identical, and the part is in active production. Board layout must accommodate the SC-79 (SOD-523) package footprint.

Q: What is the moisture sensitivity level for both parts?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

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